CN215990345U - Synchronous magnetic resistance angle grinder - Google Patents
Synchronous magnetic resistance angle grinder Download PDFInfo
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- CN215990345U CN215990345U CN202122178541.1U CN202122178541U CN215990345U CN 215990345 U CN215990345 U CN 215990345U CN 202122178541 U CN202122178541 U CN 202122178541U CN 215990345 U CN215990345 U CN 215990345U
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- angle grinder
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Abstract
The utility model discloses a synchronous reluctance angle grinder, which comprises a control system and a synchronous reluctance motor, wherein the control system comprises a motor controller and a motor controller; the synchronous reluctance motor comprises a stator and a rotor, wherein the rotor is inserted into the stator, and the rotor can rotate relative to the stator; the rotor comprises a rotating shaft, a rotor core and a position sensor, the rotor core and the position sensor are respectively sleeved on the rotating shaft, the position sensor is used for detecting the position of the rotor and feeding back the position to the control system, and the control system receives rotor position information and drives the synchronous reluctance motor to operate. The synchronous reluctance angle grinder has the advantages of high efficiency, low cost, good heat dissipation, stable performance and low vibration noise.
Description
Technical Field
The utility model belongs to the technical field of electric tools, and particularly relates to a synchronous reluctance angle grinder.
Background
The angle grinder is mainly used for cutting, grinding and brushing metal and nonmetal objects, such as steel, steel plates, wood, ceramic tiles, stone and the like, and is a widely applied electric tool. The main power sources of the angle grinder in the market comprise a brush alternating current series excited motor, a brushless direct current motor and a switched reluctance motor, wherein the brush alternating current series excited motor is most applied, and the angle grinder is characterized in that windings are arranged on a stator and a rotor, a commutator and carbon brushes are arranged, and the carbon brushes need to be replaced and regularly maintained in the using process, so the brush series excited motor has inherent defects: the power is weak, the life-span is short, the inefficiency, the interference is big, the weight is heavy, need regular maintenance etc. produce a large amount of damage each year, scrap, the waste of electric power, the waste of material and resource is a large amount.
In order to solve the problems, the brushless direct current motor angle grinder is produced at the same time, and the brushless direct current motor angle grinder quickly replaces a part of markets of brushed series excitation angle grinders with the advantages of high efficiency, strong power, small volume, no need of maintenance and the like. However, the brushless direct current motor rotor is easy to adsorb magnetic metal objects such as iron and steel due to the application of the magnetic steel made of the strong magnetic material, which easily causes the situation that the motor sweeps the corner mill, and even blocks the rotating machine seriously. In order to solve the problem, the motor rotor needs to be made into a full-sealing condition, so that the air gap is isolated from the gap of the stator slot and the air channel in a special mode, and iron powder, scrap iron and the like entering from the air channel are not absorbed onto the rotor. The rotor with the sealing structure is sealed, and the silicon steel sheets and the strong magnetic steel are adopted, so that great iron loss and magnetic steel eddy current loss are generated under high-speed and high-frequency operation, the temperature of the rotor and the magnetic steel is rapidly increased, and in addition, the sealing is adopted, the generated heat cannot be timely removed, and the irreversible demagnetization of a permanent magnet material is easily caused, which is not allowed to occur in permanent magnet motors such as brushless direct current motors and the like. In addition, the brushless direct current motor is driven by using square wave current, so that large vibration noise exists.
In order to solve the problems of the brushless direct current motor, such as temperature rise of a sealed rotor, demagnetization and the like, a switched reluctance angle grinder is also available in the market, and the rotor of the switched reluctance angle grinder does not need to adopt a permanent magnet material and operates according to a reluctance minimum principle and a pulse type current excitation mode. Because no permanent magnet is adopted, the rotor does not need to be sealed, and the heat dissipation performance is good. Besides, it has the advantages of long service life, safety and reliability, but has two disadvantages: 1) because the pulse excitation mode is adopted, the motor vibration is brought, the noise is larger than that of the brushless direct current motor, and the working environment and experience of a user are influenced to a great extent; 2) because of the special structure of the rotor, the wind mill loss of the motor rotor is larger, and the efficiency is lower than that of the brushless direct current motor.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a synchronous reluctance angle grinder which has the advantages of high efficiency, low cost, good heat dissipation, stable performance and low vibration noise.
In order to solve the technical problems, the utility model adopts the following technical scheme: a synchronous reluctance angle grinder comprises a control system and a synchronous reluctance motor; the synchronous reluctance motor comprises a stator and a rotor, wherein the rotor is inserted into the stator, and the rotor can rotate relative to the stator; the stator comprises a stator core and a stator winding, the stator core is formed by laminating silicon steel sheets, the stator core is provided with a plurality of winding slots along the circumferential direction, and the stator winding is arranged on the winding slots; the rotor comprises a rotating shaft, a rotor iron core and a position sensor, the rotor iron core and the position sensor are respectively sleeved on the rotating shaft, the position sensor is used for detecting the position of the rotor and feeding back the position to the control system, and the control system receives rotor position information and drives the synchronous reluctance motor to operate; the rotor iron core is formed by laminating silicon steel sheets; the rotor core is provided with a plurality of air slot groups which are uniformly and symmetrically distributed along the circumference of the rotor core; a plurality of air grooves which are parallel to each other are arranged in each air groove group, and the air grooves are of hollow structures.
Preferably, the stator winding adopts concentrated winding or distributed winding.
Preferably, the control system comprises a current detection feedback circuit, a position signal detection circuit, a main control circuit and a drive circuit;
the current detection feedback circuit detects the phase current of the synchronous reluctance motor and outputs the phase current to the main control circuit;
the position signal detection circuit detects the rotor bit information and outputs the rotor bit information to the main control circuit;
the main control circuit receives phase current and rotor position information and sends signals to the driving circuit, and the driving circuit controls the operation of the synchronous reluctance motor.
Preferably, the synchronous reluctance motor further comprises a speed regulation and switch circuit, the speed regulation and switch circuit changes the output voltage of the debugging switch and outputs the output voltage to the main control circuit, the main control circuit outputs corresponding signals to the driving circuit, and the driving circuit controls the operation of the synchronous reluctance motor to realize the speed regulation of the synchronous reluctance motor.
Preferably, the synchronous reluctance motor further comprises a temperature detection circuit for detecting the internal temperature of the driving circuit and the synchronous reluctance motor and outputting the result to the main control circuit, a temperature protection value is stored in the main control circuit, when the temperature detection circuit detects that the temperature is greater than the temperature protection value, the main control circuit outputs a corresponding signal to the driving circuit, and the driving circuit controls the synchronous reluctance motor to reduce power or stop running.
Preferably, the control system is installed outside the housing of the synchronous reluctance angle grinder, one end of the control system is electrically connected with the power supply, and the other end of the control system is electrically connected with a synchronous reluctance motor of the synchronous reluctance angle grinder; the control system can be simultaneously connected with N synchronous reluctance angle grinders, wherein N is a positive integer greater than 1.
Preferably, the rear end of the synchronous reluctance angle grinder shell is provided with a plurality of air inlets, and the front end of the shell is provided with a plurality of air outlets.
Preferably, the fan is fixed on a rotating shaft of the rotor, and an air outlet is formed in the shell corresponding to the fan.
Preferably, the position sensor is a hall, magnetic encoder or rotary transformer.
Preferably, the motor further comprises a speed reducing system and an output terminal, wherein the speed reducing system is installed between the synchronous reluctance motor and the output terminal.
The technical scheme adopted by the utility model has the following beneficial effects:
the angle grinder has the advantages of high efficiency, low cost, good heat dissipation, stable performance and low vibration noise by arranging the synchronous reluctance motor in the angle grinder.
The following detailed description of the present invention will be provided in conjunction with the accompanying drawings.
Drawings
The utility model is further described with reference to the accompanying drawings and the detailed description below:
FIG. 1 is a first embodiment of a synchronous reluctance angle grinder of the present invention;
FIG. 2 is a schematic diagram of a synchronous reluctance machine according to the present invention;
FIG. 3 illustrates a second embodiment of the synchronous reluctance angle grinder of the present invention;
FIG. 4 shows a third embodiment of the synchronous reluctance angle grinder of the present invention;
FIG. 5 is a circuit diagram of the control system of the present invention;
FIG. 6 is a control schematic diagram of a synchronous reluctance machine according to the present invention.
In the figure, 1, a shell, 21, a stator, 211, a stator core, 212, a winding slot, 22, a rotor, 221, a fan, 222, a position sensor, 223, a rotor core, 224, a rotating shaft, 225, an air slot, 3, a control system, 4, a speed reduction system, 5, an output terminal, 11, 12, 13, an air outlet, 14, a power supply, 15, 16, 17 and an air inlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be appreciated by those skilled in the art that features from the examples and embodiments described below may be combined with each other without conflict.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. Words such as "upper," "lower," "front," "rear," and the like, which indicate orientation or positional relationship, are based only on the orientation or positional relationship shown in the drawings and are merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices/elements must have a particular orientation or be constructed and operated in a particular orientation and, therefore, should not be taken as limiting the present invention.
The utility model discloses a synchronous reluctance angle grinder, which comprises a power supply 14, a shell 1, a control system 3, a synchronous reluctance motor 2, a speed reducing system 4 and an output terminal 5, as shown in figure 1. The rear end of the shell 1 is provided with a plurality of air inlets 15, 16 and 17, and the front end of the shell 1 is provided with a plurality of air outlets 11, 12 and 13. The control system 3 is installed at the rear part of the shell 1, the synchronous reluctance motor 2 is installed in the middle of the shell 1, the speed reduction system 4 is installed at the front part of the shell 1, and the speed reduction system 4 is installed between the synchronous reluctance motor 2 and the output terminal 5. When the synchronous reluctance angle grinder works, air entering the shell from the air inlets 15, 16 and 17 cools the control system 3, the synchronous reluctance motor 2 and the speed reduction system 4 in sequence and flows out from the air outlets 11, 12 and 13.
As shown in fig. 1 and 2, the synchronous reluctance motor 2 includes a stator 21 and a rotor 22, the rotor 22 being inserted into the stator 21, the rotor 22 being rotatable with respect to the stator 21; the stator 21 includes a stator core 211 and a stator winding, the stator core 211 is formed by laminating silicon steel sheets, the stator core 211 is provided with a plurality of winding slots 212 along a circumferential direction, and the stator winding is disposed on the winding slots 212. The stator winding adopts concentrated winding or distributed winding.
The rotor 22 comprises a rotating shaft 224, a rotor core 223, a position sensor 222 and a fan 221, the rotor core 223 and the position sensor 222 are respectively sleeved on the rotating shaft 224, the position sensor 222 is used for detecting the position of the rotor 22 and feeding back the position to the control system 3, and the control system 3 receives rotor position information and drives the synchronous reluctance motor 2 to operate; the rotor core 223 is formed by laminating silicon steel sheets; a plurality of air slot groups are arranged on the rotor iron core 223 and are uniformly and symmetrically distributed along the circumference of the rotor iron core; each air groove group is provided with a plurality of air grooves 225 which are parallel to each other and have hollow structures.
The position sensor 222 is a hall sensor, a magnetic encoder, or a rotary transformer.
The fan 221 is fixed on the rotating shaft 224 of the rotor 22, and the casing 1 corresponding to the fan 221 is provided with air outlets 12 and 13.
The stator and rotor slot pole matching combination can be a fractional slot combination (the number of slots per phase of each pole is a fraction) or an integer slot combination (the number of slots per phase of each pole is an integer).
Preferably, the synchronous reluctance motor 2 is a three-phase synchronous reluctance motor.
Fig. 3 shows a second embodiment of the synchronous reluctance angle grinder of the present invention, wherein a control system 3 is installed outside the housing 1 of the synchronous reluctance angle grinder, one end of the control system 3 is electrically connected to the power supply 14, and the other end is electrically connected to the synchronous reluctance motor 2. The control system is separated from the angle grinder, so that the weight of the angle grinder is effectively reduced, the heat dissipation and ventilation effects are improved, the maintainability, the reliability and the service life of the whole angle grinder are improved, meanwhile, the control system is not limited by the space size, intelligent control is easy to realize, various data during the work of the angle grinder, such as parameters of load, current, rotating speed and the like, are monitored, and are uploaded in real time to realize online monitoring.
FIG. 4 shows a third embodiment of the synchronous reluctance angle grinder of the present invention, in which the control system 3 is separated from the angle grinder and is installed outside the angle grinder, the control system 3 can be simultaneously connected to N synchronous reluctance angle grinders, where N is a positive integer greater than 1.
As shown in fig. 5, the control system 3 includes a current detection feedback circuit, a position signal detection circuit, a main control circuit, a driving circuit, a speed regulation and switching circuit, a temperature detection circuit, and a rectification circuit.
The current detection feedback circuit detects phase current of the synchronous reluctance motor and outputs the phase current to the main control circuit;
the position signal detection circuit detects the rotor bit information and outputs the rotor bit information to the main control circuit;
the main control circuit receives phase current and rotor position information and sends a signal to the driving circuit, and the driving circuit controls the operation of the synchronous reluctance motor;
the driving circuit comprises a power switching tube, a freewheeling diode, a capacitor and the like, wherein the power switching tube can be an MOS tube or an IGBT, and the number of the power switching tubes is A = k phase, wherein k is a positive integer greater than 2, and phase is the phase number of the motor;
the speed regulation and switch circuit changes the output voltage of the debugging switch and outputs the output voltage to the main control circuit, the main control circuit outputs corresponding signals to the driving circuit, and the driving circuit controls the operation of the synchronous reluctance motor to realize the speed regulation of the synchronous reluctance motor;
the temperature detection circuit is used for detecting the temperature in the driving circuit and the synchronous reluctance motor and outputting the result to the main control circuit, a temperature protection value is stored in the main control circuit, when the temperature detection circuit detects that the temperature is greater than the temperature protection value, the main control circuit outputs a corresponding signal to the driving circuit, and the driving circuit controls the synchronous reluctance motor to reduce power or stop running;
the rectifying circuit is used for converting alternating current into direct current.
The synchronous reluctance motor 2 can adopt the modes of vector + MTPA + flux weakening, direct torque control, flux linkage control and the like; preferably, the synchronous reluctance motor adopts a vector + MTPA + flux weakening control mode, and a control schematic block diagram of the synchronous reluctance motor is shown in fig. 6.
While the utility model has been described with reference to specific embodiments, it will be understood by those skilled in the art that the utility model is not limited thereto, and that the utility model includes, but is not limited to, those described in the following detailed description. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (10)
1. A synchronous reluctance angle grinder comprising a control system characterized by: the synchronous reluctance motor is also included; the synchronous reluctance motor comprises a stator and a rotor, wherein the rotor is inserted into the stator, and the rotor can rotate relative to the stator; the stator comprises a stator core and a stator winding, the stator core is formed by laminating silicon steel sheets, the stator core is provided with a plurality of winding slots along the circumferential direction, and the stator winding is arranged on the winding slots; the rotor comprises a rotating shaft, a rotor iron core and a position sensor, the rotor iron core and the position sensor are respectively sleeved on the rotating shaft, the position sensor is used for detecting the position of the rotor and feeding back the position to the control system, and the control system receives rotor position information and drives the synchronous reluctance motor to operate; the rotor iron core is formed by laminating silicon steel sheets; the rotor core is provided with a plurality of air slot groups which are uniformly and symmetrically distributed along the circumference of the rotor core; a plurality of air grooves which are parallel to each other are arranged in each air groove group, and the air grooves are of hollow structures.
2. The synchronous reluctance angle grinder of claim 1, wherein: the stator winding adopts concentrated winding or distributed winding.
3. The synchronous reluctance angle grinder of claim 1, wherein: the control system comprises a current detection feedback circuit, a position signal detection circuit, a main control circuit and a drive circuit;
the current detection feedback circuit detects the phase current of the synchronous reluctance motor and outputs the phase current to the main control circuit;
the position signal detection circuit detects the rotor bit information and outputs the rotor bit information to the main control circuit;
the main control circuit receives phase current and rotor position information and sends signals to the driving circuit, and the driving circuit controls the operation of the synchronous reluctance motor.
4. The synchronous reluctance angle grinder of claim 3, wherein: the speed regulation and switch circuit outputs the output voltage of the debugging switch to the main control circuit by changing the output voltage, the main control circuit outputs corresponding signals to the driving circuit, and the driving circuit controls the operation of the synchronous reluctance motor to realize the speed regulation of the synchronous reluctance motor.
5. The synchronous reluctance angle grinder of claim 3, wherein: the temperature detection circuit is used for detecting the temperature inside the driving circuit and the synchronous reluctance motor and outputting the result to the main control circuit, a temperature protection value is stored in the main control circuit, when the temperature detection circuit detects that the temperature is greater than the temperature protection value, the main control circuit outputs a corresponding signal to the driving circuit, and the driving circuit controls the synchronous reluctance motor to reduce power or stop running.
6. The synchronous reluctance angle grinder of claim 1, wherein: the synchronous reluctance angle grinder also comprises a power supply; the control system is arranged outside the shell of the synchronous reluctance angle grinder, one end of the control system is electrically connected with the power supply, and the other end of the control system is electrically connected with a synchronous reluctance motor of the synchronous reluctance angle grinder; the control system can be simultaneously connected with N synchronous reluctance angle grinders, wherein N is a positive integer greater than 1.
7. The synchronous reluctance angle grinder of claim 1, wherein: the rear end of the synchronous reluctance angle grinder shell is provided with a plurality of air inlets, and the front end of the shell is provided with a plurality of air outlets.
8. The synchronous reluctance angle grinder of claim 7, wherein: the fan is fixed on the rotating shaft of the rotor, and an air outlet is formed in the shell corresponding to the fan.
9. The synchronous reluctance angle grinder of claim 1, wherein: the position sensor is a Hall, a magnetic encoder or a rotary transformer.
10. The synchronous reluctance angle grinder of claim 1, wherein: the synchronous reluctance motor further comprises a speed reducing system and an output terminal, wherein the speed reducing system is arranged between the synchronous reluctance motor and the output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122178541.1U CN215990345U (en) | 2021-09-09 | 2021-09-09 | Synchronous magnetic resistance angle grinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122178541.1U CN215990345U (en) | 2021-09-09 | 2021-09-09 | Synchronous magnetic resistance angle grinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215990345U true CN215990345U (en) | 2022-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122178541.1U Active CN215990345U (en) | 2021-09-09 | 2021-09-09 | Synchronous magnetic resistance angle grinder |
Country Status (1)
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|---|---|
| CN (1) | CN215990345U (en) |
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2021
- 2021-09-09 CN CN202122178541.1U patent/CN215990345U/en active Active
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