CN112564329A

CN112564329A - Switched reluctance motor, fan and hand dryer

Info

Publication number: CN112564329A
Application number: CN202011508547.4A
Authority: CN
Inventors: 池晓峰; 颜士伟; 刘学; 张俊杰; 郑江松
Original assignee: Jiangsu Leili Motor Co Ltd
Current assignee: Jiangsu Leili Motor Co Ltd
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2021-03-26

Abstract

The invention relates to a switched reluctance motor, a fan and a hand dryer, comprising: the motor comprises a shell, an end cover matched and connected with the shell, a stator assembly arranged in the shell, and a rotor assembly arranged in the stator assembly and positioned between the shell and the end cover; wherein the housing has a first bearing chamber at a bottom thereof adapted to fit with a rear bearing on the rotor assembly; and the center of the end cover is provided with a second bearing chamber which is suitable for being assembled with a front bearing on the rotor component; and one end of the stator component, which is close to the end cover, is also provided with a detection element device, and a rotor shaft of the rotor component is also provided with a detected component which is suitable for being detected by the detected component. The invention does not need to use permanent magnetic materials, so the manufacturing process of the whole product system is simple and the processing cost is low.

Description

Switched reluctance motor, fan and hand dryer

Technical Field

The invention relates to the technical field of electric appliances, in particular to a switched reluctance motor, a fan and a hand dryer.

Background

The hand dryer is mainly used in occasions such as hotels, restaurants, scientific research institutions, hospitals, public entertainment places, family toilets and the like, most of hand dryer products in the market at present adopt series excited motors or brushed direct current motors, and the hand dryer has the common characteristics that carbon brushes and a commutator are used, and the carbon brushes can cause dust pollution due to abrasion during working and have short service life. In view of prolonging the service life of the hand dryer, the hand dryer adopting the direct-current permanent magnet brushless motor in the market has the advantages that the service life of the hand dryer product is prolonged, the permanent magnet material with higher use cost is required, the rotor made of the permanent magnet material has high overall cost, and the production and processing processes are complex.

Disclosure of Invention

A first object of the present invention is to provide a switched reluctance motor to solve the technical problems of simplifying the manufacturing process of the motor and reducing the manufacturing cost.

A second object of the present invention is to provide a fan, so as to solve the technical problems of simplifying the manufacturing process of a motor in the fan and reducing the manufacturing cost.

A third object of the present invention is to provide a hand dryer to solve the technical problems of extending the stability and service life of the hand dryer.

The switched reluctance motor of the invention is realized as follows:

a switched reluctance machine comprising: the motor comprises a shell, an end cover matched and connected with the shell, a stator assembly arranged in the shell, and a rotor assembly arranged in the stator assembly and positioned between the shell and the end cover; wherein

A first bearing chamber at the bottom of the housing adapted to fit with a rear bearing on a rotor assembly; and the center of the end cover is provided with a second bearing chamber which is suitable for being assembled with a front bearing on the rotor assembly; and

and one end of the stator assembly, which is close to the end cover, is also provided with a detection element device, and a rotor shaft of the rotor assembly is also provided with a detected component which is suitable for being detected by the detection element device.

In a preferred embodiment of the invention, the stator assembly comprises: the stator core, mould with the stator core and mould the integrative coil former, is suitable for winding and installing the coil on the coil former, and the terminal suitable for inserting into the coil former; wherein

The detection component is assembled on the coil rack;

the stator core is formed by laminating a plurality of silicon steel sheets, and the whole stator core is of a roughly circular structure;

a plurality of protruding parts protruding outwards in the radial direction are uniformly arranged in the circumferential direction of the stator core, and the protruding parts are in interference fit with the shell; and

the protruding portion is provided with a through hole penetrating in the axial direction, and the inner circle of the stator yoke of the stator core extends inwards to form a plurality of stator salient poles.

In a preferred embodiment of the invention, a plurality of air outlets are arranged on the side wall of the shell; and

a clamping block and a bulge are also formed on the inner side wall of the shell; wherein

The clamping hook is suitable for being clamped with one axial end of the stator core, and the protrusion is suitable for being clamped with the other axial end of the stator core.

In an optional embodiment of the invention, the detection component comprises two hall sensors which are adjacently arranged, and the detected component is a magnetic ring sleeved on the rotor shaft;

one of the two hall sensors is disposed on a center line of either of the stator salient poles, and the other hall sensor is disposed on a stator core slot center line adjacent to the stator salient pole;

the rotor assembly further comprises a rotor iron core sleeved on the rotor shaft; the center of the rotor core is provided with a through hole, and the circumferential outer side of the rotor core is provided with a plurality of rotor salient poles with the same structure.

In an optional embodiment of the invention, two rotor salient poles are symmetrically distributed on the circumferential outer side of the rotor core; and an air gap between one end of the outer circumferential side of any one of the rotor salient poles and the inner circumference of the stator core is b1, and an air gap between the other end of the outer circumferential side of the rotor salient pole and the inner circumference of the stator core is b 2;

when the rotor assembly is rotating in a counter-clockwise direction, b1> b 2; b2> b1 when the rotor assembly is rotating in the clockwise direction; and

the excircle of the magnetic ring is provided with two pairs of uniform N poles and S poles; and any pair of N pole and S pole is corresponding to a rotor salient pole.

In an alternative embodiment of the invention, a sector-shaped included angle formed between a boundary of any pair of N and S poles and one end of the outer circumferential side of the rotor salient pole, which is closer to the air gap of the inner circumference of the stator core, is 20 ° to 50 °.

In an optional embodiment of the invention, the two Hall sensors are connected with the Hall PCB board through the same Hall bracket; the Hall PCB is assembled on the coil former;

the Hall bracket is suitable for being matched and fixed with the Hall PCB; and

the Hall support is provided with a plurality of through holes which are suitable for a plurality of pins of the Hall sensor to be matched and penetrated one by one, and the pins of the Hall sensor are suitable for being bent to penetrate through the through holes and then are matched and connected with the Hall PCB;

the end face, deviating from the Hall PCB, of the Hall support is also provided with a plurality of guide grooves which are matched with the through holes in a one-to-one correspondence manner;

the groove path of the guide groove is of a bending structure relative to the axis of the through hole, so that the guide groove is suitable for guiding the pre-bent pins of the Hall sensor to be inserted into the through hole or guiding the pins of the Hall sensor to be bent in the guide groove and then inserted into the through hole.

In an optional embodiment of the invention, the detection component comprises two photoelectric switches which are adjacently arranged, and the detected component is a light barrier sleeved on the rotor shaft;

the two photoelectric switches are fixed on the same photoelectric PCB, and the photoelectric PCB is assembled on the coil frame;

one of the two photoelectric switches is disposed on a center line of either of the stator salient poles, and the other photoelectric switch is disposed on a center line of the stator core slot adjacent to the stator salient pole;

the rotor assembly also comprises a rotor iron core sleeved on the rotor shaft; the center of the rotor core is provided with a through hole, and the circumferential outer side of the rotor core is provided with a plurality of rotor salient poles with the same structure.

the light barrier comprises a base body of a circular structure sleeved on the rotor shaft, and a pair of arc-shaped baffles which are symmetrically distributed are arranged in the circumferential direction of the base body; the pair of arc baffles and the two rotor salient poles are distributed in a one-to-one correspondence mode.

In an optional embodiment of the invention, a sector included angle formed between one edge of any arc baffle plate along the radial direction of the rotor shaft and one end, with a smaller air gap, of the outer circle side of the rotor salient pole and the inner circumference of the stator core is 20-50 degrees.

The fan of the invention is realized as follows:

a blower, comprising: the switched reluctance motor, the air deflector, the fan blade and the fan cover are arranged on the fan body;

the fan cover is arranged on a flange of a shell of the reluctance motor, and a central hole at one end of the fan cover is provided with an air inlet;

the fan blade is fixed at one end of the rotor shaft and is positioned between the fan cover and the air guide plate; and

the middle of the air deflector is provided with a central hole so that one end of the rotor shaft can penetrate through the central hole to fix the fan blades.

The hand dryer of the invention is realized as follows:

a hand dryer comprising: the fan is arranged in the shell; and

and a controller suitable for controlling the fan to operate is also arranged in the shell.

In an alternative embodiment of the invention, the controller comprises: the controller comprises a control board, a controller shell and a controller shell cover; wherein

The control panel is fixed in the controller shell and the controller shell cover;

the control panel comprises a control PCB; the control PCB is provided with a weak current area and a strong current area;

the weak current area extends from one side of the control PCB to the middle; the strong current region is distributed around the weak current region.

In an optional embodiment of the invention, an MCU control unit, a temperature detection circuit, an infrared induction and heating power switching circuit, a debugging and downloading port circuit, a rotor position signal detection circuit, an LED display control circuit, a current amplification and chopper circuit, an auxiliary power supply circuit, a bus voltage detection circuit and an overcurrent protection circuit are arranged in the weak current area;

and a rectifying circuit, a two-phase asymmetric half-bridge circuit and a heating wire control circuit are arranged in the strong current region.

Compared with the prior art, the invention has the following beneficial effects: the utility model discloses a switched reluctance motor, fan and hand dryer compares in the hand dryer that uses the series excited machine, and the motor system who comprises switched reluctance motor is longe-lived, and the operation is reliable, does not produce polluted environment dust, manufacturing process is simple. Compared with a hand dryer using a brushless direct current permanent magnet motor, the switched reluctance motor does not need to use a permanent magnet material, so that a motor system formed by the switched reluctance motor is low in cost and simple in manufacturing process.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 shows a schematic diagram of an explosion structure of a fan provided in embodiment 2 of the present invention;

fig. 2 is a schematic structural diagram illustrating a housing of a switched reluctance motor according to embodiment 1 of the present invention;

fig. 3 is a schematic view illustrating a matching structure of a housing and a stator assembly of a switched reluctance motor according to embodiment 1 of the present invention;

fig. 4 is a schematic partial structural diagram of a stator assembly of a switched reluctance motor according to embodiment 1 of the present invention;

fig. 5 is a schematic partial structural diagram of a stator assembly of a switched reluctance motor according to embodiment 1 of the present invention;

fig. 6 is a schematic view showing a partial structure of a stator assembly of a switched reluctance motor according to embodiment 1 of the present invention;

fig. 7 is a schematic diagram illustrating a structure of a hall sensor of a switched reluctance motor, a hall bracket, and a hall PCB provided in embodiment 1 of the present invention;

fig. 8 is a schematic structural diagram illustrating a hall PCB of a switched reluctance motor according to embodiment 1 of the present invention;

fig. 9 is a schematic view showing a first view structure of a hall bracket of a switched reluctance motor according to embodiment 1 of the present invention;

fig. 10 is a schematic view illustrating a second view structure of a hall bracket of a switched reluctance motor according to embodiment 1 of the present invention;

fig. 11 is a schematic structural diagram illustrating a hall sensor of a switched reluctance motor according to embodiment 1 of the present invention;

fig. 12 is a schematic structural view illustrating a stator core of a switched reluctance motor according to embodiment 1 of the present invention;

fig. 13 is a schematic structural view showing a stator core and rotor salient poles of a switched reluctance motor according to embodiment 1 of the present invention;

fig. 14 is a schematic view illustrating a structure of a rotor salient pole of a switched reluctance motor according to embodiment 1 of the present invention engaged with a magnetic pole of a magnetic ring;

fig. 15 is a schematic view illustrating a matching structure of a hall sensor and a magnetic pole of a magnetic ring of a switched reluctance motor according to embodiment 1 of the present invention under different conditions;

fig. 16 is a schematic diagram illustrating a matching structure of an optoelectronic switch and an optoelectronic PCB of a switched reluctance motor according to embodiment 1 of the present invention;

fig. 17 is a schematic view illustrating a split structure of an opto-electrical switch and an opto-electrical PCB of a switched reluctance motor according to embodiment 1 of the present invention;

fig. 18 is a schematic structural diagram showing an optoelectronic switch of a switched reluctance motor according to embodiment 1 of the present invention;

fig. 19 is a schematic structural diagram showing a light barrier of a switched reluctance motor provided in embodiment 1 of the present invention;

fig. 20 is a schematic view showing a structure of a rotor salient pole and a light barrier of a switched reluctance motor according to embodiment 1 of the present invention;

fig. 21 is a schematic diagram illustrating a structure of an opto-electronic switch of a switched reluctance motor according to embodiment 1 of the present invention cooperating with an arc-shaped barrier of a light barrier under different conditions;

fig. 22 is a schematic diagram illustrating a distribution of strong and weak current regions of a control board of a hand dryer according to embodiment 3 of the present invention;

fig. 23 is a schematic diagram showing the distribution of the circuits of the control board of the hand dryer according to embodiment 3 of the present invention;

fig. 24 is a functional block diagram of a control board of the hand dryer provided in embodiment 3 of the present invention;

fig. 25 is a circuit diagram of an MCU control unit of the hand dryer provided in embodiment 3 of the present invention;

fig. 26 is a circuit diagram of an infrared induction and heating function switching circuit of a hand dryer according to embodiment 3 of the present invention;

fig. 27 is a circuit diagram of an LED display control circuit of a hand dryer according to embodiment 3 of the present invention;

fig. 28 is a circuit diagram of a two-phase asymmetric half-bridge circuit of a hand dryer provided in embodiment 3 of the present invention;

fig. 29 is a circuit diagram of a rotor position signal detection circuit of the hand dryer provided in embodiment 3 of the present invention;

fig. 30 is a schematic diagram illustrating the installation of the power switch tube and the heat dissipation plate of the two-phase asymmetric half-bridge circuit of the hand dryer according to embodiment 3 of the present invention;

fig. 31 is an exploded view of a controller of a hand dryer provided in embodiment 3 of the present invention;

fig. 32 is a front view of a controller housing of a hand dryer provided in embodiment 3 of the invention;

FIG. 33 is a rear view of FIG. 32;

FIG. 34 is a top view of FIG. 32;

FIG. 35 is a side view of FIG. 32;

fig. 36 is a front view of a controller housing cover of a hand dryer provided in embodiment 3 of the present invention;

FIG. 37 is a side view of FIG. 36;

fig. 38 is a schematic view showing an internal structure of a fan provided in embodiment 2 of the present invention.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views, and merely illustrate the basic structure of the present invention, and therefore, they show only the components related to the present invention.

Example 1:

referring to fig. 1, the present embodiment provides a switched reluctance motor including: the rotor comprises a shell 501, an end cover 502 matched with the shell 501, a stator assembly arranged in the shell 501, and a rotor assembly arranged in the stator assembly and positioned between the shell 501 and the end cover 502; wherein at the bottom of the housing 501 there is a first bearing chamber adapted to fit with a rear bearing 503 on the rotor assembly; and the center of the end cap 502 is provided with a second bearing chamber adapted to fit with the front bearing 505 on the rotor assembly; and a detection element device is further arranged at one end of the stator assembly close to the end cover 502, and a component to be detected which is suitable for being detected by the detected component is further arranged on the rotor shaft 506 of the rotor assembly, namely, the detection of the rotor position is realized through the detection of the component to be detected on the rotor shaft 506 by the detection element device.

The subassemblies are first described next:

the stator assembly includes: a stator core 510, a bobbin 511 injection-molded integrally with the stator core 510, a coil 512 adapted to be wound around the bobbin 511, and a terminal 513 adapted to be inserted into the bobbin 511; in which the detection component is mounted on a bobbin 511.

The stator core 510 is formed by laminating a plurality of silicon steel sheets, and the whole stator core 510 is of a roughly circular structure; a plurality of protrusions 515 protruding radially outward are uniformly arranged in the circumferential direction of the stator core 510, and the protrusions 515 are in interference fit with the housing 501 to restrict circumferential rotation of the stator core 510; and a through hole 516 penetrating in the axial direction is formed in the protruding portion 515, and the through hole 516 is formed such that when the stator core 510 and the bobbin 511 are injection-molded, injection-molded material flows into the through hole 516, whereby the bonding strength between the bobbin 511 and the stator core 510 can be secured. The inner circle of the stator yoke of the stator core 510 is extended inward to form a plurality of stator salient poles 517.

In more detail, the bobbin 511 is injection molded integrally with the stator core 510, and the injection molded layer surrounds the stator salient pole 517 portion. The stator core 510 and the coil rack 511 are molded integrally, so that the coil rack 511 and the stator core 510 can be combined more firmly, the problem of difficult assembly is solved, and the stator core 511 has the advantages that the coil rack 511 is not easy to deform and warp in the environment with large temperature change and the noise is low. The radial outer edge of one axial end of the coil frame 511 is integrally provided with four grooves 518 for inserting the terminals 513, and the terminals 513 are inserted into the grooves 518 and are in contact with the head of the coil 512 or the tail of the coil 512 in the grooves 518 to form electrical connection; and the other axial end of the coil rack 511 is provided with two threaded holes 533 and positioning convex columns 535 for installing and fixing the detection components. With such a design structure, the threaded hole 533 for fixing the monitoring component can be far away from the winding position of the coil frame 511, and the threaded hole 533 and the positioning boss 535 are located near the through hole 516 on the outer edge of the stator core 510, so that the positions of the threaded hole 533 and the positioning boss 535 are not deformed after winding.

Further, the housing 501:

a plurality of air outlets 520 are formed in the side wall of the shell 501; with reference to the drawings of the present embodiment, in an optional implementation case, the number of the air outlets 520 is 4, and the 4 air outlets 520 are specifically disposed on a portion of the side wall of the housing 501 close to the bottom wall, and the arrangement of the air outlets 520 may play an effect of quickly dissipating heat during the use of the motor. In addition, in the present embodiment, a latch 521 and a protrusion 522 are further formed on the inner side wall of the housing 501; the latch 521 is adapted to be engaged with one axial end of the stator core 510, and the protrusion 522 is adapted to be engaged with the other axial end of the stator core 510. It should be noted that there is not only one latch 521 and one protrusion 522, but alternatively, the latches 521 may be, for example, but not limited to, four spaced and uniformly arranged along the circumferential direction of the inner side wall of the housing 501, and the protrusions 522 may also be, for example, but not limited to, four spaced and uniformly arranged along the circumferential direction of the inner side wall of the housing 501. To fixture block 521 and protruding 522 of this implementation be formed at the in-process that casing 501 and stator module carried out riveting, after stator module packs into casing 501, rivet on the casing 501 lateral wall by riveting tools, thereby form fixture block 521 and protruding 522 at the inside wall of casing 501, make stator module and casing 501 fixed, restrict stator module's axial motion by fixture block 521 and protruding 522 to stator core 510 axial both ends of stator module, make stator module can not produce the relative movement in casing 501 in the use, ensure the firmness after the assembly between stator module and the casing 501.

Next, the detection component of the present embodiment is described, but for the detection component of the present embodiment, for example, but not limited to, the hall sensor 302 may be used, or the photoelectric switch 551 may be used, and the present embodiment will be described by taking these two cases as examples.

In the first case, the detection component includes two hall sensors 302 arranged adjacently, and the detected component is a magnetic ring 531 sleeved on the rotor shaft 506; the two hall sensors 302 herein are specifically mounted to the bobbin by the following structure.

The two Hall sensors 302 are connected with the Hall PCB 301 through the same Hall bracket 304 in a matching mode; and the hall PCB 301 is mounted on the bobbin 511. I.e. the hall bracket 304, plays a transitional role between the hall sensor 302 and the hall PCB board 301. The two hall sensors 302 of the present embodiment have the same structure as the hall bracket 304, and therefore, the following description of the present embodiment will be made only with reference to the specific case of one hall sensor 302.

In detail, the hall bracket 304 is adapted to be fixedly coupled with the hall PCB 301, a plurality of through holes 303 through which a plurality of pins 3022 of the hall sensor 302 are fitted one by one are formed in the hall bracket 304, and the pins 3022 of the hall sensor 302 are adapted to be bent to penetrate through the through holes 303 and then are adapted to be coupled with the hall PCB 301; the end surface of the hall bracket 304, which faces away from the hall PCB 301, is further provided with a plurality of guide grooves 305 which are in one-to-one corresponding fit with the plurality of through holes 303.

In addition, a plurality of pad holes 306 which are correspondingly matched with the through holes 303 on the Hall support 304 one by one are arranged on the Hall PCB 301; and the plurality of through holes 303 are not collinear; and the plurality of pad holes 306 are not collinear, and such a structure is used in cooperation with the bent pins 3022 of the hall sensor 302 of the present embodiment, that is, after the plurality of pins 3022 of the hall sensor 302 are bent, the plurality of pins 3022 of each hall sensor 302 are not collinear with each other. Therefore, in the present embodiment, the plurality of pins 3022 of the hall sensor 302 are bent and coupled to the hall PCB 301, so that the defective rate of the coupling process between the hall sensor 302 and the hall PCB 301 can be reduced. Specifically, because the three pins 3022 of the hall sensor 302 are linearly distributed before being bent, and the distance between every two adjacent pins 3022 is too close, if the pins 3022 are directly welded to the hall PCB 301 without being bent, the pad holes 306 formed in the hall PCB 301 need to be linearly distributed corresponding to the pins 3022 of the hall sensor 302 that are linearly distributed, and the distance between the pad holes 306 is small, so that the defective rate of the solder joints between the pad holes 306 is increased, and the defective rate of the solder joints formed after the corresponding processing is also increased.

In a specific optional implementation case, in conjunction with the drawing of this embodiment, the number of the pins 3022 of each hall sensor 302 is three; the number of the through holes 303 corresponding to each hall sensor 302 on the hall support 304 is three, and the three through holes 303 are distributed in a triangular structure; the number of the pad holes 306 of each hall sensor 302 on the hall PCB 301 is also three, and the three pad holes 306 are distributed in a triangular structure. Here, the three through holes 303 and the three pad holes 306, specifically, the structure forming the triangular structure or the structure forming the other shape, is determined according to the shape formed by bending the three pins 3022 of the hall sensor 302, and therefore, the present embodiment is not limited to the specific shape of the three through holes 303 and the three pad holes 306 in the actual use case, and the shape formed by bending the three pins 3022 of the hall sensor 302 is mainly used for adaptive matching.

In addition, in the pin 3022 of the hall sensor 302 according to the embodiment, the guide groove 305 according to the embodiment can guide the pin 3022 of the hall sensor 302 inserted into the through hole 303, the channel of the guide groove 305 according to the embodiment is bent with respect to the axis of the through hole 303, and in this case, the guide groove 305 according to the embodiment can guide the pre-bent pin 3022 of the hall sensor 302 to be inserted into the through hole 303; in addition, the guide groove 305 in such a structure may also be configured such that the pin 3022 of the hall sensor 302 is guided to be bent in the guide groove 305 and then inserted into the through hole 303. That is, in the first case, the lead 3022 of the hall sensor 302 is bent and molded in advance before entering the guide groove 305, and the bent and molded lead 3022 is inserted into the through hole 303 after passing through the groove of the guide groove 305, until the lead 3022 of the hall sensor 302 is finally inserted into the pad hole 306 of the hall PCB 301 and then is welded and fixed to the hall PCB 301. In contrast to the second case, the lead 3022 of the hall sensor 302 is not subjected to a pre-bending process before entering the guide groove 305, but the lead 3022 of the hall sensor 302 is guided by the groove path of the guide groove 305 to be sequentially inserted into the through hole 303 and the pad hole 306 on the hall PCB 301 while being bent, directly during the process of mounting the lead 3022 of the hall sensor 302 into the guide groove 305 and the through hole 303, i.e., during the process, the groove path of the guide groove 305 has a bending guide effect on the lead 3022 of the hall sensor 302.

In summary, in both cases, the pin 3022 of the hall sensor 302 can be finally welded and fixed to the pad hole 306 on the hall PCB 301 in a bent state, but in the first case, the pin 3022 of the hall sensor 302 is bent in advance to form a straight line segment within a certain length of the root of the connection between the pin 3022 of the hall sensor 302 and the body 3021 of the hall sensor 302, so that the root of the pin 3022 is not easily damaged in the bending process, and thus the usability of the hall sensor 302 is effectively ensured. In the second case, the pin 3022 of the hall sensor 302 is not bent in advance, so that it cannot be ensured that the pin 3022 of the hall sensor 302 is a straight line segment within a certain length of the root portion of the connection between the pin 3021 of the hall sensor 302 and the body 3021 of the hall sensor 302, and the pin 3022 is also bent at the root portion, thereby causing damage to the root portion and finally affecting the use performance of the hall sensor 302.

It should be further noted that, in this embodiment, a sensor mounting portion is further disposed on an end surface of the hall bracket 304, which is away from the hall PCB 301; the sensor mounting portion includes a surrounding wall 3071 adapted to surround the circumference of the body 3021 of the hall sensor 302, and at least one opening 3072, optionally a pair of symmetrically disposed openings 3072, is opened in the surrounding wall 3071. The opening 3072 can give way to the guide groove 305, and can facilitate the demolding of the sensor mounting portion during machining. The surrounding wall 3071 can serve as a circumferential support for the body 3021 of the hall sensor 302, so that the body 3021 of the hall sensor 302 can be limited in the sensor mounting part after being fixed to the hall PCB 301 by welding, thereby avoiding the problem of shaking of the body 3021 of the hall sensor 302.

For the hall bracket 304 of the present embodiment, the firmness of the coupling between the hall bracket 304 and the hall PCB 301 directly affects the stability of the coupling between the hall sensor 302 and the hall PCB 301. In view of effectively ensuring the firmness of the coupling between the hall bracket 304 and the hall PCB board 301, as an alternative case, the following structure is adopted in the present embodiment, which is illustrated in the attached drawings:

firstly, at least one raised positioning column 308 is arranged on the end surface of the Hall support 304 facing the Hall PCB 301; and at least one matching hole 309 suitable for matching with the at least one positioning column 308 is formed on the hall PCB 301. The positioning posts 308 and the matching holes 309 are matched to mainly play a role in guiding and limiting the assembling process of the hall bracket 304 and the hall PCB 301.

Secondly, at least two hooks 310 which are distributed at intervals and are suitable for being clamped and matched with the hall PCB 301 are also convexly arranged on one side end surface of the hall bracket 304 facing the hall PCB 301. In an optional case, in combination with the drawings of the present embodiment, two hooks 310 distributed at intervals are further protruded on one side of the side end surface of the hall bracket 304 facing the hall PCB 301; in addition, in consideration of convenience and high efficiency of processing, one of the two hooks 310 in the embodiment is suitable for being clamped and fixed with the side end surface of the hall PCB 301, so that the side end surface of the hall PCB 301 can be directly utilized to be matched and connected with the hook 310, and the process of forming the hook hole 321 on the hall PCB 301 can be reduced. The other hook 310 of the two hooks 310 is suitable for being fastened and fixed with a hook hole 321 prefabricated on the hall PCB 301, wherein the hook hole 321 is opened on the hall PCB 301. In summary, for the two hooks 310 of the present embodiment, only one hook hole 321 needs to be formed on the hall PCB 301.

It should be noted that, at least two positioning holes 322 and at least two screw mounting holes 323 are formed on the hall PCB 301, the screw mounting holes 323 are matched with the threaded holes 533 on the bobbin 511, and the positioning holes 322 are matched with the positioning bosses 535 on the bobbin 511, so as to fix the hall PCB 301 to the bobbin 511, and the firmness of the assembly between the hall PCB 301 and the bobbin 511 is effectively ensured through the matching of the above structures.

With regard to the two hall sensors 302 of the present embodiment, it is further noted that one of the two hall sensors 302 is disposed on the center line of either of the stator salient poles 517, and the other hall sensor 302 is disposed on the stator core slot center line adjacent to the above-mentioned stator salient pole 517; the rotor assembly further includes a rotor core 534 sleeved on the rotor shaft 506; the rotor core 534 has a through hole at the center thereof, the rotor core 534 is mounted on the rotor shaft 506 having a rib 536 on the outer circumference thereof, and a plurality of rotor salient poles 532 having the same structure are provided on the circumferential outer side of the rotor core 534. The rotor shaft 506 with the convex rib 536 on the outer circle is pressed into the rotor core 534 to ensure that the rotor shaft 506 and the rotor core 534 are firmly assembled, and compared with the rotor shaft 506 with the outer circle knurling structure, the rotor assembly with the structure has small deformation and stable size.

For example 4/2, the switched reluctance motor has two salient rotor poles 532 symmetrically distributed on the outer circumferential side of the rotor core 534, and because the two salient rotor poles 532 are designed to be centrosymmetric, the unbalance amount of the whole rotor assembly is small under such a condition, the whole rotor assembly can reliably work at a high rotation speed, and a process of calibrating the rotor balance on a production line is not required to be added. And the air gap formed between each of the rotor salient poles 532 and the inner circumference of the stator core 510 is not uniform and is gradually varied. Here, the air gaps formed between the two ends of the outer circumference side of the two rotor salient poles 532 of the rotor core 534 and the inner circumference of the stator core 510 are designed to be unequal, so as to ensure that the motor rotor can be self-started at any angular position without an auxiliary starting device.

Specifically, the present embodiment defines an air gap between one end of the outer circumferential side of any of the rotor salient poles 532 and the inner circumference of the stator core 510 as b1, and an air gap between the other end of the outer circumferential side of the rotor salient pole 532 and the inner circumference of the stator core 510 as b 2; when the rotor assembly is rotating in a counter-clockwise direction, b1> b 2; b2> b1 when the rotor assembly is rotating in the clockwise direction; and the outer circle of the magnetic ring 531 is provided with two pairs of uniform N poles and S poles; and one rotor salient pole 532 is corresponding to any pair of N pole and S pole.

Here, the magnetic ring 531 and the copper ring are molded integrally, that is, the magnetic ring 531 is fixedly connected with the rotating shaft through the copper ring. A magnetic ring 531 is axially mounted between the front bearing 505 bearing and the rotor core 534. In order to ensure that the relative angle of the rotor salient poles 532 of the rotor core 534 with the magnetic poles of the magnetic ring 531 is fixed, the magnet ring 531 is provided with aligning holes opposite to the rotor salient poles 532, so that when the magnet ring 531 and the rotor shaft 506 are assembled, the rotor salient pole 532 can be also provided with a positioning hole, the positioning tools pass through the positioning hole to realize the positioning of the rotor salient pole 532 and the positioning hole, or the rotor salient pole 532 is not provided with the positioning hole, but the auxiliary positioning tool ensures that the relative position between the rotor salient pole 532 and the auxiliary positioning tool is fixed by virtue of the fan-shaped structure of the rotor salient pole 532, and under the condition, it is possible for the hall sensor to determine the angular position of the rotor salient poles 532 by detecting only the angular position of the magnetic ring 531, and after the MCU control unit which is electrically connected with the Hall sensor obtains the position signal of the rotor salient pole 532 through the signal input end of the sensor, the MCU control unit controls the opposite coil 512 in the stator component to switch on or switch off the excitation.

With regard to the magnetic ring 531 of the present embodiment, for the two pairs of magnetic poles on the magnetic ring 531, a fan-shaped edge-included angle K formed between a boundary between any pair of N-pole and S-pole and an end of the rotor salient pole 532 on the outer circumferential side where the air gap from the inner circumference of the stator core 510 is small is 20 ° to 50 °, with a preferable angle being 34.9 °. The accurate setting of the positions of the two hall sensors 302 and the accurate design of the relative positions of the magnetic poles of the magnetic ring 531 and the rotor protrusions 522 are combined, so that the accuracy of the position detection of the rotor shaft 506 and the induction accuracy of the hall sensors 302 can be effectively improved. And the structure can also cause the motor to change the phase under the condition of maximum inductance or minimum inductance, and the motor efficiency is high.

Referring to the drawings, the two hall sensors 302 will be described in detail, and the hall sensor 302 disposed on the center line of any stator salient pole 517 is defined as hall a, and the hall sensor 302 disposed on the center line of the stator core slot adjacent to the stator salient pole 517 is defined as hall B.

As shown in fig. 15(a), hall a senses the S pole of the magnetic ring 531, hall B senses the N pole of the magnetic ring 531, at this time, the phase a coil 512 on the coil bobbin 511 is de-energized, the phase B coil 512 is energized, and the rotor shaft 506 rotates in the direction of minimum magnetic resistance due to the electromagnetic force, that is, rotates counterclockwise to the position shown in fig. 15 (B);

as shown in fig. 15(B), when hall a senses the S-pole of the magnetic ring 531 and hall B senses the S-pole of the magnetic ring 531, the phase a coil 512 on the coil bobbin 511 is de-energized, the phase B coil 512 is energized, and the rotor shaft 506 rotates in the direction of minimum magnetic resistance due to the electromagnetic force, that is, rotates counterclockwise to the position shown in fig. 15 (c);

as shown in fig. 15(c), when hall a senses the N pole of the magnetic ring 531 and hall B senses the S pole of the magnetic ring 531, the phase a coil 512 is energized, the phase B coil 512 is de-energized, and the rotor shaft 506 rotates in the direction of minimum magnetic resistance due to the electromagnetic force, i.e., rotates counterclockwise to the position shown in fig. 15 (d);

as shown in fig. 15(d), when the hall a senses the N pole of the magnetic ring 531 and the hall B senses the N pole of the magnetic ring 531, the phase a coil 512 is energized, the phase B coil 512 is de-energized, and the rotor shaft 506 rotates in the direction with the minimum magnetic resistance due to the electromagnetic force, that is, rotates counterclockwise to the position shown in fig. 15(a), so as to form a cycle, and ensure that the rotor shaft 506 can rotate counterclockwise at any position.

In the second case, the detection component includes two adjacent photoelectric switches 551, and the detected component is a light barrier sleeved on the rotor shaft 506; the light barrier of the present embodiment is stamped and formed from a sheet metal material. Both the photoelectric switches 551 are fixed on the same photoelectric PCB board 552, and the photoelectric PCB board 552 is assembled on the bobbin 511. One of the two photoelectric switches 551 is disposed on the center line of either of the stator salient poles 517, and the other photoelectric switch 551 is disposed on the stator core slot center line adjacent to the above-described stator salient pole 517.

In detail, a first positioning hole 553 is arranged on the photoelectric PCB 552 and assembled with a positioning mounting post 557 at the bottom of the photoelectric switch 551, and a second positioning hole 555 is arranged above the first positioning hole 553 and assembled with a positioning boss 535 of the coil rack 511 in the stator assembly; near the second positioning hole 555, there is provided a screw hole 556, where the screw hole 556 cooperates with the screw hole 533 on the bobbin 511 to achieve the assembling fixation of the photoelectric PCB 552 and the bobbin 511.

The photoelectric switch 551 of the present embodiment is of a groove structure, a concave groove 554 in the photoelectric switch 551 is used for detecting the angular position of the light barrier on the rotor shaft 506, and two positioning mounting posts 557 with different sizes are disposed at the bottom of the photoelectric switch 551 and correspond to the first positioning holes 553 on the photoelectric PCB 552. The opto-electronic switch 551 also has four pins soldered to corresponding pads of the opto-electronic PCB board 552. In an alternative implementation, the two positioning posts 557 are different in size, and thus the two positioning posts 557 with different sizes correspond to the first positioning holes 553 in the optoelectronic PCB 552, so that the optoelectronic switch 551 is prevented from being reversely mounted, and the optoelectronic switch 551 is reliably mounted on the optoelectronic PCB.

For the rotor assembly in the present embodiment, the structure of the rotor assembly in the case of using the photoelectric switch 551 is optionally the same as that in the case of using the hall sensor 302, and therefore, the detailed description of the structure of the rotor assembly is omitted here.

In detail, the light barrier includes a circular base 558 fitted around the rotor shaft 506, and a pair of arc baffles 559 symmetrically disposed around the base 558, the pair of arc baffles 559 being disposed corresponding to the two salient rotor poles 532. Base 558 is connected with the outer circle of rotor shaft 506 by interference fit through a centrally disposed flanged hole, and a light barrier is axially installed between front bearing 505 and rotor core 534. The relative angle between the pair of rotor salient poles 532 of the rotor core 534 and the pair of arc-shaped shutters 559 of the light-blocking plate of the present embodiment is fixed. When the two are assembled, the auxiliary positioning tool ensures that the relative position between the two is fixed, under the condition, the angular position of the rotor salient pole 532 can be determined only by detecting the angular position of the light barrier for the photoelectric switch 551, and the MCU control unit electrically connected with the photoelectric switch 551 controls the opposite coil 512 in the stator assembly to switch on or switch off excitation after obtaining the position signal of the rotor salient pole 532 through the signal input end of the inductor.

It should be further noted that a sector included angle K formed between one of edges of any of the arc baffles 559 in the radial direction of the rotor shaft 506 and one end of the outer circumferential side of the rotor salient pole 532, which is closer to the air gap of the inner circumference of the stator core 510, is 20 ° to 50 °. With a preferred angle being 34.9. The accurate setting of the positions of the two photoelectric switches 551 and the precise design of the arc-shaped baffle 559 of the light barrier and the rotor protrusion 522 relative to the positions are combined, so that the accuracy of the position detection of the rotor shaft 506 and the sensing precision of the photoelectric switches 551 can be effectively improved. And the structure can also cause the motor to change the phase under the condition of maximum inductance or minimum inductance, and the motor efficiency is high.

Referring to the drawings, the two photoelectric switches 551 will be described in detail, and the photoelectric switch 551 disposed on the center line of any one of the stator salient poles 517 will be defined as photoelectric switch a, and the photoelectric switch 551 disposed on the center line of the stator core slot adjacent to the stator salient pole 517 will be defined as photoelectric switch B.

As shown in fig. 21(a), the photoelectric switch a does not sense the arc-shaped barrier 559 of the light barrier, and the photoelectric switch B senses the arc-shaped barrier 559 of the light barrier, at this time, the phase a coil 512 on the bobbin 511 is de-energized, the phase B coil 512 is energized, and the rotor shaft 506 rotates in the direction with the minimum magnetic resistance due to the electromagnetic force, that is, rotates counterclockwise to the position shown in fig. 21 (B);

as shown in fig. 21(B), the photoelectric switch a does not sense the arc-shaped barrier 559 of the light barrier, and the photoelectric switch B does not sense the arc-shaped barrier 559 of the light barrier, at this time, the phase a coil 512 on the bobbin 511 is de-energized, the phase B coil 512 is energized, and the rotor shaft 506 rotates in the direction of minimum magnetic resistance due to the electromagnetic force, that is, rotates counterclockwise to the position shown in fig. 21 (c);

as shown in fig. 21(c), when the photoelectric switch a senses the arc-shaped barrier 559 of the light barrier and the photoelectric switch B does not sense the arc-shaped barrier 559 of the light barrier, the phase a coil 512 is energized, the phase B coil 512 is de-energized, and the rotor shaft 506 rotates in the direction with the minimum magnetic resistance due to the electromagnetic force, that is, rotates counterclockwise to the position shown in fig. 21 (d);

as shown in fig. 21(d), the photoelectric switch a senses the arc-shaped barrier 559 of the light barrier, and the photoelectric switch B senses the arc-shaped barrier 559 of the light barrier, at this time, the phase a coil 512 is energized, the phase B coil 512 is de-energized, and the rotor shaft 506 rotates in the direction with the minimum magnetic resistance due to the electromagnetic force, that is, rotates counterclockwise to the position shown in fig. 21(a), so as to form a cycle, and ensure that the rotor shaft 506 can rotate counterclockwise at any position.

Compared with the structure adopting the hall sensor 302, the structure adopting the photoelectric switch 551 has the advantages that on one hand, the photoelectric switch 551 does not need to use the hall bracket 304 of the hall sensor 302 with a fixed position, and the assembly is convenient and the overall cost is low. On the other hand, the rotor assembly using the structures of the hall sensor 302 and the magnetic ring 531 needs to use the magnetic ring 531 made of the permanent magnetic material, and the magnetic ring 531 needs to be magnetized, and the light barrier of the design scheme adopts a metal plate stamping manufacturing scheme, so that the light barrier has the advantages of low material cost and simple process.

End cap 502, described last:

the end cap 502 is fixedly mounted on a flange of the housing 501. The end cap 502 has two mounting holes on its two sides, each corresponding to two mounting holes, corresponding to mating holes on the flange of the housing 501, and the bearing chamber of the rotor shaft 506 is mounted at the center of the end cap 502 by screws.

Example 2:

on the basis of the switched reluctance motor of embodiment 1, the present embodiment provides a fan, including: the switched reluctance motor, the air deflector 561, the fan blades 562 and the wind scooper 563 of embodiment 1; the wind shield 563 is mounted on a flange of the housing 501 of the reluctance motor, and a central hole at one end of the wind shield 563 is provided with a gas inlet 568; the fan 562 is fixed at one end of the rotor shaft 506 and is positioned between the wind cover 563 and the air deflector 561; and a central hole is formed in the middle of the air deflector 561, so that one end of the rotor shaft 506 passes through the central hole and then fixes the fan blades 562. Two threaded matching holes are further formed in two sides of the central hole of the end cover 502, and screws penetrate through mounting holes of the air guide plate 561 to fix the air guide plate 561 on the end cover 502.

After the rotor shaft 506 of the switched reluctance motor of the blower of the present embodiment rotates, the blades 562 rotate along with the rotor shaft 506, the air near the air inlet flows into the air inlet 568 under the action of the centrifugal blades of the blades 562, the air flowing into the air inlet 568 passes through the gap between the guide blades on the air guide plate 561, flows into the gap formed between the outer edge of the stator and the inner wall of the casing 501 and flows out from the air outlet 520 on the side of the casing 501 at a high speed.

Example 3:

on the basis of the fan of embodiment 2, this embodiment provides a hand dryer, includes: the fan is arranged in the shell; and a controller suitable for controlling the operation of the fan is also arranged in the shell. The controller here includes a control board 2, a controller case 3, and a controller case cover 4, and the control board 2 is fixed inside the controller case 3 and the controller case cover 4.

The controller housing 3 is provided with a mounting base plate 31 for accommodating the control panel 2, two positioning and matching posts 311 and two screw matching holes 312 are fixed at four corners of the inner surface of the bottom of the mounting base plate 31, the two positioning and matching posts 311 are distributed at one set of diagonal positions of the mounting base plate 31 and correspond to the mounting holes on the control PCB board 1, and the two screw matching holes 312 are distributed at the other set of diagonal positions of the mounting base plate 31 and correspond to the mounting holes on the control PCB board 1 for fixing the control PCB board 1 of the control panel 2.

Two fitting projections 32 are provided on one end edge of the controller case 3. The bottom outer surface of the mounting bottom plate 31 of the controller housing 3 is further provided with two housing fixing portions 313, and a matching connection hole for fixedly mounting the controller with the outside is formed in the center of each housing fixing portion 313. A plurality of outlet holes 33 are formed on one side surface of the controller case 3 for passing through connection wires between the control board 2 and the outside. For example: the commercial power supply passes through the wire outlet hole 33 through a wire to be connected with the power input end on the control panel 2; the working state output end on the control panel 2 passes through the wire outlet hole 33 through a wire to be connected with a display device on the hand dryer; the input end of the inductor on the control panel 2 passes through the wire outlet hole 33 through a lead to be connected with the inductor on the hand dryer; the output end of the heater on the control panel 2 passes through the wire outlet 33 through a lead to be connected with a heating wire on the hand dryer; the motor rotor position signal input end on the control panel 2 is connected with the motor rotor position signal input end on the hand dryer motor by a lead penetrating through the wire outlet hole 33; the input end of the temperature sensor on the control board 2 passes through the wire outlet hole 33 through a lead to be connected with the temperature sensor on the hand dryer; the output end of the switched reluctance motor on the control panel 2 passes through the wire outlet hole 33 through a lead to be connected with the coil 512 on the hand dryer motor.

The edge of one end of the controller shell cover 4 is provided with two mounting holes 41 used for being assembled with the mounting protrusions 32 on the controller shell 3, so that firm mounting between the controller shell cover 4 and the controller shell 3 is ensured, and the mounting holes 41 are rectangular through mounting holes. The edge of the controller shell cover 4 is also provided with a shell cover fixing part 42, and the center of the shell cover fixing part 42 is provided with a matching mounting hole for mounting and fixing the controller and the outside.

The control PCB board 1 is provided with a weak current area 11 and a strong current area 12, the weak current area 11 extends from one side of the control PCB board 1 to the middle, and the strong current area 12 is distributed around the weak current area 11; in order to prevent the mutual interference of high-voltage components and low-voltage components and ensure the insulation gap and creepage distance between the high-voltage components and the low-voltage components, a control PCB of a control board is divided into a strong current area and a weak current area, the high-voltage components are placed in the strong current area, and the low-voltage components are placed in the weak current area.

As shown in fig. 23, an MCU control unit 111, an NTC temperature detection circuit 112, an infrared induction and heating power switching circuit 113, a debug and download port circuit 114, a rotor position signal detection circuit 115, an LED display control circuit 116, a current amplification and chopper circuit 117, an auxiliary power supply circuit 118, a bus voltage detection circuit 119, and an overcurrent protection circuit 110 are provided in the weak current region 11; the strong electric region 12 is provided with a rectifying circuit 121, a two-phase asymmetric half-bridge circuit 122, and a heater wire control circuit 123.

As shown in fig. 30, the power switch T and the heat sink TS of the two-phase asymmetric half-bridge circuit 122 are disposed below the control PCB 1, and the electronic components of the other circuits are disposed above the control PCB 1. Due to the large size of the power switch tube T and the heat dissipation plate TS, this layout can save space.

As shown in fig. 25, the MCU control unit is used to control the hand dryer according to the received various sensing information and input information; the MCU chip is powered by direct current 3.3V, and is provided with first to nineteenth I/O ports, program debugging and programming ports SWCLK and SWDIO, and the I/O ports are connected with the circuits.

As shown in fig. 24, the heating wire is installed on the air duct of the hand dryer, and the air sucked by the hand dryer is heated by the driving of the heating wire control circuit. The heating wire control circuit controls the power supply of the heating wire to be switched on or switched off according to a heating instruction sent by the MCU control unit, and if the heating wire has a fault which cannot work, the heating wire control circuit transmits a fault signal to the MCU control unit.

As shown in fig. 28, the two-phase switched reluctance motor is rotated by driving of a two-phase asymmetric half-bridge circuit. The two-phase asymmetric half-bridge circuit is used for enabling the two-phase switched reluctance coil 512 to be switched on or off under the control of the MCU control unit. As shown in fig. 28, the two-phase asymmetric half-bridge circuit includes a half-bridge circuit module and a power transistor circuit module, the half-bridge circuit module includes an a-phase half-bridge driving module and a B-phase half-bridge driving module, the power transistor circuit module includes an a-phase power transistor driving module and a B-phase power transistor driving module, a circuit a1 of the a-phase half-bridge driving module is the same as a circuit B1 of the B-phase half-bridge driving module, and a circuit a2 of the a-phase power transistor driving module is the same as a circuit B2 of the B-phase power transistor driving module.

As shown in fig. 28, the a-phase half-bridge driving module includes 8 resistors, four capacitors, two diodes, and a driving chip, pin 1 of the driving chip U4 is connected to a 15V voltage output terminal VCC15V of the auxiliary power supply, one end of the resistor R90 is used as a signal input terminal of a +, the other end of the resistor R90 is connected to pin2 of the driving chip U4 and one end of the capacitor C42, the other end of the capacitor C42 is connected to GND, one end of the resistor R91 is used as a signal input terminal of a-, the other end of the resistor R91 is connected to pin3 of the driving chip U4 and one end of the capacitor C43, the other end of the capacitor C43 is connected to GND, one end of the capacitor C28 is connected to VCC15V, the other end of the capacitor C28 is connected to GND, the positive electrode of the bootstrap diode D11 is connected to the resistor R55 in series and then to VCC15V, the negative electrode of the bootstrap diode D11 is connected to one end of the pin 8 of the driving chip U5 and one end of the capacitor C58, the anode of the diode D12 is connected in series with the resistor R56 and then connected with the gate of the power tube T1 of the A-phase power tube driving module, one end of the resistor R57 is connected with the cathode of the diode D12, the other end of the resistor R57 is connected with the gate of the power tube T1 of the A-phase power tube driving module and one end of the resistor R58, the other end of the resistor R58 is connected with the pin 6 of the driving chip U4, one end of the resistor R59 is connected with the pin5 of the driving chip U4, the other end of the resistor R59 is connected with one end of the resistor R60 and the gate of the power tube T2 of the A-phase power tube driving module, and the other end of the resistor R60 is connected with one end of the current detection resistor. Wherein the signal input end of A + is connected with the thirteenth I/O port of the MCU control unit, and the signal input end of A-is connected with the tenth I/O port of the MCU control unit.

As shown in fig. 28, the a-phase power transistor driving module includes two power transistors, two diodes, and two capacitors, the gate of the power transistor T1 is connected to one end of the resistor R58 and the other end of the resistor R57, the emitter of the power transistor T1 is connected to the other end of the resistor R58, the pin 6 of the driving chip, the cathode of the fast recovery diode FWD2, and one end of the capacitor C48, one end of the motor phase-A coil 512 is connected, a collector of a power tube is connected with a bus voltage input end Vmx of a rectifying circuit, a cathode of a fast recovery diode FWD1 and one end of a capacitor C34, an anode of the fast recovery diode FWD2 is connected with GND, the other end of the capacitor C48 is connected with GND, a gate of the power tube T2 is connected with the other end of a resistor R59 and one end of a resistor R60, an emitter of the power tube T2 is connected with the other end of a resistor R60 and one end of a current detection resistor R73, and a current detection resistor R73 is a current detection resistor voltage drop output port Vyj. Wherein the capacitor C34 and the capacitor C48 are installed near the power tube T1.

As shown in fig. 28, a capacitor C42, a capacitor C43, a capacitor C44, and a capacitor C45 are used in the a-phase half-bridge driving module and the B-phase half-bridge driving module, where the capacitor C42 can suppress an interference signal generated in a transmission process from the thirteenth I/O port of the MCU control unit to the a + signal input terminal, the capacitor C43 can suppress an interference signal generated in a transmission process from the tenth I/O port of the MCU control unit to the a-signal input terminal, the capacitor C44 can suppress an interference signal generated in a transmission process from the fourteenth I/O port of the MCU control unit to the B + signal input terminal, and the capacitor C45 can suppress an interference signal generated in a transmission process from the eleventh I/O port of the MCU control unit to the a + signal input terminal, thereby preventing misconduction of the power tube.

As shown in fig. 28, the a-phase half-bridge driving module uses the diode D12, the resistor R56D 14, and the resistor R62, so that the power transistor T1 can be turned off quickly, and the power consumption and temperature rise of the power transistor T1 are reduced; the B-phase half-bridge driving module uses the diode D14 and the resistor R62, so that the power tube T2 can be quickly turned off, and the power consumption and the temperature rise of the power tube T2 are reduced.

As shown in fig. 28, compared with the conventional power topology circuit, the a-phase power tube driving module uses the capacitor C34 and the capacitor C48 installed near the power tube T1, the B-phase power tube driving module uses the capacitor C35 and the capacitor C49 installed near the power tube T2, which can effectively suppress the radiation interference GB4343.1-2018, 4.1.2.2 generated by the system, and the capacitance values of the capacitor C34, the capacitor C48, the capacitor C35, and the capacitor C49 can be adjusted by an experimental method, so that the radiation interference value generated by the system can be minimized, in this embodiment, the capacitance values of C34 and C35 are 1.5uF, and the capacitance values of C48 and C49 are 0.012 uF.

As shown in fig. 24, the rectifying circuit is used to convert the commercial power input to the hand dryer into direct current; the auxiliary power supply circuit is used for converting direct current generated by the rectifying circuit into different voltage values for supplying power to all components contained in the hand dryer control system.

As shown in fig. 26, the infrared sensing circuit is used for receiving signals of the infrared sensor, and when a user places a hand in the sensing area of the air outlet of the hand dryer, the signals are transmitted to the MCU control unit; the infrared induction circuit comprises an infrared receiving circuit consisting of a pin5 pin of an access end CN7 of the infrared sensor, a resistor R23, a resistor R24, a resistor R105, a triode Q4, a triode Q5, a capacitor C10, a capacitor C11, an infrared signal output end RX and an infrared signal control end RT. The pin5 of the access end CN7 of the infrared sensor is connected with the signal output of the infrared sensor on the hand dryer, which is not shown, the infrared signal output end is connected with the fourth I/O port of the MCU control unit, and the infrared signal control end is connected with the sixth I/O port of the MCU control unit.

In order to prevent the infrared sensor from being interfered to cause the malfunction of the system, the internal program of the MCU chip of the MCU control unit is set as follows: the sixth I/O port of the MCU control unit sends a square wave signal with fixed frequency to the base of the triode Q5 through the infrared control end, when the base of the triode Q5 is at a high level, whether the fourth I/O port of the MCU control unit connected with the infrared signal output end is at a low level is detected, if the infrared signal output end is at a low level, the infrared inductor is considered to sense an object, and if the infrared signal output end is at a high level, the infrared inductor is considered not to sense the object.

As shown in fig. 26, the heating function switching circuit is used for switching the heating or non-heating function, and transmitting the signal of the heating function switching key of the hand dryer panel to the MCU main control unit; in fig. 26, JR1 is a heating function indication receiving terminal, and JR2 is a heating function switching signal.

As shown in fig. 24, the bus voltage detection circuit is configured to convert the direct current generated by the rectification circuit into a low voltage signal that can be detected by the MCU control unit and transmit the low voltage signal to the MCU control unit; in this embodiment, the direct current generated by the rectifying circuit is about 311V, and the voltage is converted into a range of 0-3.3V by the voltage dividing circuit, so that the MCU can perform detection. The purpose of setting up the detection circuitry of bus voltage is through producing the warning when detecting the commercial power and being too low or too high, and this system stops work when the commercial power is too low or too high, protection system.

As shown in fig. 24, the temperature detection circuit transmits the detected temperature signal of the temperature sensor installed at the outlet of the hand dryer to the MCU control unit; when the temperature is too high, the heating power of the heating wire is reduced, and when the temperature is too low, the heating power of the heating wire is increased, so that a user can obtain a comfortable and constant temperature. In this embodiment, it may be an NTC temperature sensor.

As shown in fig. 27, the LED display control circuit is used to turn on or off the LED lamp installed on the hand dryer under the control of the MCU control unit, and different frequencies of turning on or off correspond to different faults, so as to facilitate inspection or maintenance. The LED display control circuit is composed of a pin2 pin of an LED lamp access end CN9 for indicating a power supply connection function, a pin3 pin of an LED lamp access end CN9 for indicating a fault function, a resistor R31, a resistor R32, a triode Q6, a triode Q7, a fault signal input end GZ and a power supply connection signal input end DY. Wherein pin2 pin of the LED lamp access terminal CN9 for indicating power on function and pin3 pin of the LED lamp access terminal CN9 for indicating fault function are respectively connected with the corresponding LED lamp on the hand dryer, the power on signal input terminal is connected with the fifteenth I/O port of the MCU control unit, and the fault signal input terminal is connected with the sixteenth I/O port of the MCU control unit.

Setting an MCU chip internal program of the MCU control unit: if the hand dryer is connected with the mains supply, the power supply connection signal input end of the fifteenth I/O port receiving the MCU control unit controls the LED lamp indicating the power supply connection function to be normally on; if the system has a fault, under the control of the MCU control unit, the fault signal input end controls the LED lamp indicating the fault function to display a corresponding fault signal, in order to enable the LED lamp indicating the fault function to display different fault types, the MCU control unit enables the LED lamp to have different flashing frequencies, and a user or maintenance personnel can identify the fault type of the hand dryer according to the different flashing frequencies of the LED lamp, so that the hand dryer can be quickly diagnosed and processed, and is convenient to maintain. According to the embodiment, a plurality of fault lamps are not needed to be correspondingly used for displaying a plurality of fault types, and the design scheme that only one fault LED lamp can display a plurality of fault types can save the system cost and simplify the circuit structure.

As shown in FIG. 24, debug and download port circuitry is used to debug and program programs.

As shown in fig. 24, the current-limiting protection circuit is configured to amplify the detected current of the motor coil winding, compare the amplified current with a first set value, and transmit the first set value to the MCU control unit, and the MCU control unit determines whether the two-phase switched reluctance motor coil is turned on or off according to the comparison result.

As shown in fig. 24, the overcurrent protection circuit is configured to compare the amplified current of the coil winding of the motor with a second set value and transmit the current to the MCU control unit, and if the current is not lower than the second set value within a predetermined time, the MCU control unit stops the motor and displays a corresponding fault signal through the LED lamp; for example, if the motor coil is shorted, the motor is de-energized and stops operating.

As shown in fig. 29, the rotor position signal detection circuit is configured to transmit the received position signal of the motor rotor to the MCU control unit. The rotor position signal sensor comprises a rotor position signal sensor input interface terminal J1, resistors R37, R38, R40, R41, capacitors C14, C15, C16, diodes D8, D81, D9, D91, a position A signal output terminal WZA and a position B signal output terminal WZB. And the input interface end J1 of the rotor position signal sensor is connected with the position sensor on the two-phase switched reluctance motor, the signal output end of the position A is connected with the eighteenth I/O port of the MCU control unit, and the signal output end of the position B is connected with the nineteenth I/O port of the MCU control unit.

The above embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention. In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention usually place when in use, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the present invention, unless otherwise expressly stated or limited, the first feature may be present on or under the second feature in direct contact with the first and second feature, or may be present in the first and second feature not in direct contact but in contact with another feature between them. First feature over, on, or on second feature includes first feature directly over and obliquely above second feature, or merely means that the first feature is at a higher level than the second feature. A first feature may be included below, beneath, and beneath a second feature, including the first feature being directly beneath and obliquely beneath the second feature, or merely indicating that the first feature is at a lesser level than the second feature.

Claims

1. A switched reluctance machine, comprising: the motor comprises a shell, an end cover matched and connected with the shell, a stator assembly arranged in the shell, and a rotor assembly arranged in the stator assembly and positioned between the shell and the end cover; wherein

2. The switched reluctance machine of claim 1, wherein the stator assembly comprises: the stator core, mould with the stator core and mould the integrative coil former, is suitable for winding and installing the coil on the coil former, and the terminal suitable for inserting into the coil former; wherein

The detection component is assembled on the coil rack;

3. The switched reluctance motor of claim 2, wherein a plurality of air outlets are formed on a side wall of the housing; and

4. The switched reluctance motor of claim 2, wherein the detecting component comprises two hall sensors disposed adjacently, and the component to be detected is a magnetic ring sleeved on the rotor shaft;

5. The switched reluctance machine of claim 4, wherein the circumferentially outer side of the rotor core has two rotor salient poles symmetrically distributed; and an air gap between one end of the outer circumferential side of any one of the rotor salient poles and the inner circumference of the stator core is b1, and an air gap between the other end of the outer circumferential side of the rotor salient pole and the inner circumference of the stator core is b 2;

6. The switched reluctance motor of claim 5, wherein a sector-shaped side angle formed between a boundary line of any one pair of the N-pole and the S-pole and an end of the outer circumferential side of the rotor salient pole, which is located closer to the air gap of the inner circumference of the stator core, is 20 ° to 50 °.

7. The switched reluctance motor of any one of claims 4 to 6, wherein both of the Hall sensors are connected with the Hall PCB board through the same Hall bracket; the Hall PCB is assembled on the coil former;

the Hall bracket is suitable for being matched and fixed with the Hall PCB; and

the Hall bracket is provided with a plurality of through holes which are suitable for a plurality of pins of the Hall sensor to pass through in a one-to-one matching way, and the pins of the Hall sensor are suitable for being bent to pass through the through holes and then are matched and connected with the Hall PCB;

8. The switched reluctance motor of claim 2, wherein the detection component comprises two adjacent photoelectric switches, and the detected component is a light barrier sleeved on the rotor shaft;

9. The switched reluctance machine of claim 8, wherein the circumferentially outer side of the rotor core has two rotor salient poles symmetrically distributed; and an air gap between one end of the outer circumferential side of any one of the rotor salient poles and the inner circumference of the stator core is b1, and an air gap between the other end of the outer circumferential side of the rotor salient pole and the inner circumference of the stator core is b 2;

10. The switched reluctance motor of claim 9, wherein an included angle of a sector formed between one of edges of any one of the arc-shaped dampers in a radial direction of the rotor shaft and an end of the rotor salient pole on an outer circumferential side thereof, which is spaced from a smaller air gap of an inner circumference of the stator core, is 20 ° to 50 °.

11. A fan, comprising: the switched reluctance motor, the air deflector, the fan blade and the fan housing according to any one of claims 1 to 10;

12. A hand dryer, comprising: a housing and a fan according to claim 11 disposed within the housing; and

13. A hand dryer according to claim 12, wherein the controller comprises: the controller comprises a control board, a controller shell and a controller shell cover; wherein

14. The hand dryer according to claim 13, wherein an MCU control unit, a temperature detection circuit, an infrared induction and heating power switching circuit, a debugging and downloading port circuit, a rotor position signal detection circuit, an LED display control circuit, a current amplification and chopper circuit, an auxiliary power supply circuit, a bus voltage detection circuit, and an overcurrent protection circuit are disposed in the weak current region;