CN217469724U - Miniature brushless motor device - Google Patents

Abstract

The utility model provides a miniature brushless motor device, which comprises a housin, central pivot, the iron core rotor, magnet group, the iron core stator, the coil, but the iron core rotor cover is located central pivot and synchronous rotation, but on the iron core rotor was located to the magnet equipment, the iron core stator surrounded outside the iron core rotor and fixed locate the casing in, the coil is located on the iron core stator, its characterized in that is equipped with spacing hole in the casing, the one end cartridge of central pivot is in spacing downthehole and the turned angle of the central pivot of spacing hole restraint of accessible. The utility model discloses the both ends of center pivot are not equipped with the shell fragment, and the usable magnet group of one of them aspect and the mutual acting force between the iron core stator make the center pivot return to just, interfere spacing portion and restrict the turned angle of center pivot through spacing hole on the one hand, compare in shell fragment structure, the rotation range of control center pivot that can be more accurate, and can not influence performance and life along with the increase of use number of times. The utility model has the characteristics of novel structure, stable performance, drive power reinforce etc.

Description

Miniature brushless motor device

[ technical field ] A method for producing a semiconductor device

The utility model relates to a motor, in particular to miniature brushless motor device with high vibration frequency and reliable performance.

[ background of the invention ]

As is known, in a conventional vibration motor, a set of adjustable eccentric blocks is respectively installed at two ends of a rotor shaft of an iron core, and an excitation force is obtained by using a centrifugal force generated by high-speed rotation of the shaft and the eccentric blocks. The vibration frequency range of the vibration motor is large, and mechanical noise can be reduced only if the exciting vibration force is properly matched with power. Because the eccentric structure is used, the vibration amplitude is not uniform, the vibration frequency is not stable enough, and the miniaturization is not easy. Therefore, in order to meet different requirements, a micro brushless motor device has been developed, which generates a magnetic field by an alternating current to rotate a rotor at a high frequency and a small amplitude, such as a motor, which is a patent solution applied by the applicant before. According to the existing motor structure, the elastic sheet is arranged at one end of the central rotating shaft, the elastic sheet is utilized to help the central rotating shaft to return to the right, and the rotation amplitude of the iron core rotor is restrained through the elastic sheet to a certain degree. When the spring plate works, the spring plate can be twisted in a reciprocating way along with the reciprocating rotation of the central rotating shaft, and when the spring plate is used for a certain number of times, the performance of the spring plate is reduced; in addition, this kind of motor, when the assembly, the shell fragment assembly degree of difficulty is great, is unfavorable for improving assembly efficiency.

[ Utility model ] content

The present invention is directed to solve the above problems, and provides a novel miniature brushless motor device.

In order to solve the problem, the utility model provides a miniature brushless motor device, it includes casing, central pivot, iron core rotor, magnet group, iron core stator, coil, the iron core rotor cover is located but the synchronous rotation of the last center pivot, the magnet equipment is located on the iron core rotor, the iron core stator surround in the iron core rotor is outer and fixed to be located in the casing, the coil is located on the iron core stator, its characterized in that be equipped with spacing hole in the casing, the one end cartridge of central pivot in spacing downthehole and accessible spacing hole restraint the turned angle of central pivot.

Furthermore, one end of the central rotating shaft is provided with a limiting part, the limiting hole is a rectangular hole, the size of the rectangular hole is larger than that of the limiting part, and the limiting part is inserted into the limiting hole and can move in the limiting hole.

Further, the shell comprises a cylinder body and an end cover which are connected in an involutory manner; the barrel is provided with a central through hole, the end cover is provided with a groove opposite to the central through hole, and the bottom of the groove is provided with the limiting hole; one end of the central rotating shaft penetrates through the central through hole and extends out of the cylinder body, and the other end of the central rotating shaft penetrates through the groove and is inserted into the limiting hole; and a first bearing is arranged between the central rotating shaft and the central through hole, and a second bearing is arranged between the central rotating shaft and the groove.

Furthermore, an even number of magnet slots which are arranged along the axial direction are uniformly arranged on the iron core rotor, the magnet group comprises an even number of bar magnets, and the magnets are respectively embedded in the magnet slots.

Further, the iron core stator comprises a peripheral part, a plurality of guide parts and a plurality of magnetic shoe parts, wherein the peripheral part is cylindrical and is attached to the inner wall of the cylinder; the guide parts are formed on the inner wall of the peripheral part in a protruding mode, and the number of the guide parts is consistent with that of the magnet slots; the magnetic shoe portion is arranged on the end portion of the guiding portion and faces the iron core rotor, and the magnetic shoe portion is spaced from the peripheral portion and the iron core rotor.

Further, an insulating sleeve is arranged between the iron core stator and the coil, and covers the end parts of the two ends of the iron core stator to isolate the coil from the iron core stator.

Furthermore, the insulating sleeve comprises a first abutting plate part, a plurality of second abutting plate parts, a plurality of third abutting plate parts and a blocking part, wherein the first abutting plate part is in a circular plate shape and is matched with the periphery of the iron core stator; the second abutting plate part is formed on the inner wall of the first abutting plate part in a protruding mode, and the shape and the number of the second abutting plate part are matched with those of the guide part; the third abutting plate part is formed on the end part of the second abutting plate part, and the shape and the number of the third abutting plate part are matched with those of the magnetic shoe part; the blocking part is vertically extended from the inner sides of the first abutting plate part, the second abutting plate part and the third abutting plate part to form a plurality of mutually spaced frame-shaped structures.

Furthermore, the insulating sleeve further comprises a supporting portion which is formed on one side surface of the first abutting plate portion in a protruding mode, and the supporting portion and the blocking portion are located on two sides of the first abutting plate portion respectively.

Furthermore, the first abutting plate part, the second abutting plate part and the third abutting plate part are attached to the end face of the iron core stator; the blocking part is attached to the inner wall of the peripheral part, the side wall of the guide part and the inner wall of the magnetic shoe part; the supporting part is abutted against the inner wall of the shell.

Further, the central rotating shaft is sleeved with a sleeve, one end of the sleeve is abutted to the end of the iron core rotor, and the other end of the sleeve is abutted to the first bearing.

The beneficial contributions of the utility model reside in that, it has effectively solved above-mentioned problem. The utility model discloses a miniature brushless motor device includes the casing, the center pivot, the iron core rotor, magnet group, the iron core stator, coil and insulating cover, the both ends of center pivot are not equipped with the shell fragment, the mutual acting force between usable magnet group and the iron core stator in the one hand and make the center pivot return just, be equipped with spacing portion at the tip of center pivot on the one hand, be equipped with spacing hole in the casing inside, interfere spacing portion and restrict the turned angle of center pivot through spacing hole, compare in shell fragment structure, the rotation range of control center pivot that can be more accurate, and can not influence performance and life along with the increase of use number of times. Furthermore, the utility model discloses a miniature brushless motor device has installed more magnet and coil, and it can provide bigger drive power, and the deflection angle of central pivot is littleer more reliable, consequently the utility model discloses a miniature brushless motor device's high-frequency vibration performance is better. The utility model discloses a miniature brushless motor device has characteristics such as novel structure, stable performance, drive power reinforce, and it has very strong practicality, should widely popularize.

[ description of the drawings ]

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is an exploded view of the structure.

Fig. 3 is an exploded view of the structure.

Fig. 4 is a longitudinal sectional view.

Fig. 5 is a schematic cross-sectional view.

The attached drawings are as follows: the magnetic core comprises a shell 10, a cylinder 11, a central through hole 111, an end cover 12, a limiting hole 121, a lead hole 13, a groove 122, a central rotating shaft 20, a limiting part 21, a long shaft part 22, a shaft shoulder part 23, a positioning connecting part 24, an iron core rotor 30, a magnet slot 31, a magnet group 40, an iron core stator 50, an outer peripheral part 51, a guide part 52, a magnetic shoe part 53, a notch 531, a hollow structure 54, a coil 60, an insulating sleeve 70, a first abutting plate part 71, a second abutting plate part 72, a third abutting plate part 73, a blocking part 74, a frame-shaped structure 741, a supporting part 75, a first bearing 81, a second bearing 82 and a sleeve 90.

[ detailed description ] embodiments

The following examples are further to explain and supplement the present invention, and do not constitute any limitation to the present invention.

As shown in fig. 1 to 5, the miniature brushless motor apparatus of the present invention includes a housing 10, a central shaft 20, a core rotor 30, a magnet group 40, a core stator 50, a coil 60, and an insulating sleeve 70.

As shown in fig. 1 to 5, the central shaft 20 is disposed in the housing 10, and one end of the central shaft extends out of the housing 10; the iron core rotor 30 is sleeved on the central rotating shaft 20 and can rotate synchronously; the magnet assembly 40 is mounted on the core rotor 30. The core stator 50 surrounds the core rotor 30, and interacts with the magnet assembly 40 to make the core rotor 30 and the central rotating shaft 20 rotate back and forth. The coil 60 is disposed on the iron core stator 50, and is used for supplying a working power. When the coil 60 is supplied with a current with a variable direction, the magnetic poles of the iron core stator 50 with a variable polarity interact with the magnet assembly 40, and under the action of a magnetic force, the iron core rotor 30 and the central rotating shaft 20 rotate to enable the corresponding magnetic poles of the magnet assembly 40 to face the corresponding magnetic poles of the iron core stator 50, so that the central rotating shaft 20 can rotate back and forth, and high-frequency vibration is output to the outside. When the central rotating shaft 20 rotates reciprocally, the housing 10 may restrict a rotation angle of the central rotating shaft 20.

As shown in fig. 2, 3 and 4, in order to restrict the rotation angle of the central rotation shaft 20, a stopper hole 121 is provided in the housing 10, and a stopper portion 21 is provided at one end of the central rotation shaft 20. The limiting hole 121 is a rectangular hole, and the size thereof is larger than that of the limiting portion 21. The position-limiting part 21 is inserted into the position-limiting hole 121 and can move in the position-limiting hole 121. The size of the limiting hole 121 is designed to limit the moving range of the limiting part 21, so that the rotation angle of the central rotating shaft 20 can be limited.

Further, as shown in fig. 1, 2, and 3, the housing 10 includes a cylinder 11 and an end cap 12 connected in a matching manner. A central through hole 111 is provided on the cylinder 11 for mounting the first bearing 81. A groove 122 is formed in the end cap 12 at a position opposite to the central through hole 111, and the groove 122 is used for mounting the second bearing 82. A recessed rectangular hole is formed in the bottom of the groove 122, and the rectangular hole forms the limiting hole 121.

As shown in fig. 1 to 4, one end of the central rotating shaft 20 passes through the central through hole 111 and extends out of the cylinder 11, the other end of the central rotating shaft 20 passes through the groove 122 and is inserted into the limiting hole 121, and the limiting portion 21 is disposed at the end of the central rotating shaft 20. A first bearing 81 is arranged between the central rotating shaft 20 and the central through hole 111, and a second bearing 82 is arranged between the central rotating shaft 20 and the groove 122; therefore, the central rotary shaft 20 can rotate relative to the housing 10. And because the limiting part 21 of the central rotating shaft 20 is inserted into the limiting hole 121, the limiting hole 121 can limit the rotation amplitude of the limiting part 21, and therefore, the central rotating shaft 20 can be limited by the housing 10 in terms of the rotation angle.

In order to more clearly describe the structure of the present invention, the following embodiments are described:

as shown in fig. 1 to 4, the housing 10 includes a cylinder 11 and an end cap 12 connected to each other.

As shown in fig. 1 to 4, the cylindrical body 11 has a cylindrical shape, one end of which is open and the other end of which is open. The open end of the cylinder 11 is provided with the central through hole 111. The open end of the cylinder 11 is connected with the end cover 12 in an involutory way.

As shown in fig. 1 to 4, the end cap 12 is in a shape of a circular cap, and is connected to the open end of the cylinder 11 in an involutory manner. The inner side of the end cover 12 is provided with the groove 122 and the limiting hole 121, and the limiting hole 121 is not communicated with the outside.

As shown in fig. 1, in order to facilitate connection of the coil 60 to a power supply, a lead hole 13 is formed in the housing 10, and the wire of the coil 60 inside the housing 10 is passed through and extended out of the housing 10. The shape and size of the lead hole 13 are not limited, and it may be provided on the cylinder 11 or on the end cap 12. In this embodiment, the plurality of lead holes 13 are disposed at the position where the cylinder 11 and the end cap 12 are connected together.

As shown in fig. 1 to 4, the central rotating shaft 20 is a long shaft, and includes a limiting portion 21, a long shaft portion 22, a shaft shoulder 23, and a positioning connecting portion 24, which are integrally formed in this order. The long shaft portion 22 is cylindrical, and the cross section of the stopper portion 21 is racetrack-shaped and is located at the center of the end portion of the long shaft portion 22. The arc-shaped side wall of the limiting part 21 is smoothly connected with the circumferential side wall of the long shaft part 22, and a step is formed between the planar side wall of the limiting part 21 and the long shaft part 22, so that the central rotating shaft 20 is conveniently connected with the groove 122 and the limiting hole 121 on the end cover 12 to restrict the rotating angle of the central rotating shaft 20. The shaft shoulder 23 is formed by gradually contracting the circumferential side wall of the long shaft portion 22. The positioning connection 24 is used to connect an object to be driven, such as a toothbrush head or the like. The positioning connection 24 is preferably shaped so as to avoid circumferential rotation between the central shaft 20 and the object to be driven, for example, it may be shaped so as to have a rectangular, semicircular, etc. cross section. When the central rotating shaft 20 is rotatably connected to the housing 10, the limiting portion 21 is located in the limiting hole 121 in the end cover 12; one end of the long shaft part 22 is positioned in the groove 122 of the end cover 12 and is rotatably connected with the second bearing 82; the other end of the long shaft part 22 is positioned in the central through hole 111 of the cylinder 11 and is rotatably connected with the first bearing 81; the shaft shoulder 23 and the positioning connection part 24 are located outside the cylinder 11.

As shown in fig. 1 to 5, the iron core rotor 30 is sleeved on the central rotating shaft 20 and can rotate synchronously with the central rotating shaft 20. In this embodiment, the iron core rotor 30 is sleeved on the long axis portion 22 of the central rotating shaft 20, and two ends of the iron core rotor 30 are respectively spaced from the inner wall of the casing 10, so that the iron core rotor 30 is in a suspended state with respect to the casing 10. The material for making the iron core rotor 30 can be set according to the requirement, and in this embodiment, it is formed by laminating a plurality of silicon steel sheets.

As shown in fig. 2 and 3, the core rotor 30 is provided with an even number of magnet slots 31 provided in the axial direction. The magnet slots 31 are spaced from each other and are used for mounting the magnet assembly 40. In this embodiment, 6 magnet slots 31 are uniformly distributed on the side wall of the iron core rotor 30 at intervals. The magnet slots 31 have the same shape and size, and the distances between the magnet slots 31 are the same.

As shown in fig. 2, 3, 4 and 5, the magnet assembly 40 is mounted on the core rotor 30 and can rotate synchronously with the core rotor 30. The magnet assembly 40 is adapted to interact with the core stator 50. In this embodiment, the magnet group 40 includes 6 bar magnets, and the magnets are respectively embedded in the magnet slots 31 and flush with the outer peripheral surface of the iron core rotor 30. The magnetic poles of the magnets are arranged in an axial direction transverse to the central rotating shaft 20, in other words, one magnetic pole (N pole or S pole) of the magnets faces the core rotor 30, and the other magnetic pole faces the core stator 50 away from the core rotor 30. The magnetic pole distribution mode of the plurality of magnets in the magnet group 40 is as follows: adjacent two magnets face the core rotor 30 with opposite magnetic poles. The magnet assembly 40 may interact with the core stator 50 through magnetic poles with different polarities, so that when the magnetic poles of the core stator 50 are alternately changed, the magnet assembly 40 needs to move to enable the corresponding magnetic poles to interact with the core stator 50, thereby driving the core rotor 30 and the central rotating shaft 20 to rotate reciprocally to form high-frequency vibration.

As shown in fig. 4 and 5, the core stator 50 is fixedly disposed in the housing 10 and surrounds the core rotor 30. The core stator 50 can be made of any desired material, and in this embodiment, is made of a plurality of laminated silicon steel sheets.

As shown in fig. 3, the core stator 50 includes an outer peripheral portion 51, a plurality of guide portions 52, and a plurality of magnetic shoe portions 53.

As shown in fig. 2 and 3, the outer peripheral portion 51 is cylindrical and is in contact with the inner wall of the housing 10. In some embodiments, glue may be applied between the outer peripheral portion 51 and the inner wall of the housing 10, so that the core stator 50 is fixedly connected with the housing 10. In some embodiments, the peripheral portion 51 is in interference fit with the housing 10 so that the core stator 50 is fixedly connected with the housing 10.

As shown in fig. 2 and 3, the guide portion 52 is formed to protrude from an inner wall of the outer peripheral portion 51 and face the core rotor 30. The distribution of the guiding parts 52 is the same as that of the magnet slots 31, and in this embodiment, 6 guiding parts 52 are uniformly spaced on the inner wall of the peripheral part 51. Both ends of the guide portion 52 in the axial direction are flush with both ends of the peripheral portion 51, respectively.

As shown in fig. 2 and 3, the magnetic shoe portion 53 is formed at an end of the guide portion 52, spaced apart from the peripheral portion 51, and faces the core rotor 30. The distribution of the magnetic shoe portions 53 is the same as the distribution of the magnet slots 31, and in the present embodiment, 6 magnetic shoe portions 53 are provided and formed at the end of each guide portion 52. In this embodiment, two ends of the magnetic shoe part 53 along the axial direction are respectively flush with two ends of the guiding part 52 along the axial direction, and the magnetic shoe parts 53 are symmetrically distributed outside two sides of the guiding part 52 along two lateral sides; and adjacent two magnetic shoes 53 are spaced from each other. The shape of the magnetic shoe portions 53 may be set as needed, and in this embodiment, each magnetic shoe portion 53 is an arc plate shape, which is bent toward the core rotor 30 side, so that the 6 magnetic shoe portions 53 enclose a cylindrical space. The magnetic shoe portions 53 are spaced apart from the core rotor 30 by a predetermined distance, and the plurality of magnetic shoe portions 53 surround the core rotor 30. The magnetic shoes 53 have a magnetic gathering function, and when the coil 60 is powered on, the core stator 50 forms N poles or S poles at the magnetic shoes to interact with corresponding magnets in the magnet group 40.

Further, as shown in fig. 2 and 3, in order to make the magnetic poles of the core stator 50 strongest at the symmetrical center of the magnetic shoe portion 53, a notch 531 is provided at the symmetrical center of the magnetic shoe portion 53. In this embodiment, the notch 531 is a semi-cylindrical shape and extends from one end of the magnetic shoe portion 53 to the other end thereof in the axial direction.

As shown in fig. 2 to 5, the coil 60 is wound around the core stator 50. In this embodiment, the coil 60 is sleeved on the guiding portion 52 of the core stator 50, and both sides of the coil 60 are limited by the outer peripheral portion 51 and the magnetic shoe portion 53, so that the coil 60 can be prevented from being scattered. In this embodiment, the coil 60 has 6 coil packs respectively mounted on the guiding portions 52, and the end wires of the coil packs can be led out of the housing 10 through the lead holes 13 of the housing 10 to connect to a power supply.

Further, as shown in fig. 2 to 5, an insulating sleeve 70 is further provided between the core stator 50 and the coil 60. The insulating sleeve 70 does not separate the core stator 50 from the coil 60, and serves to support and fix the core stator 50 in the housing 10 in a relatively fixed manner.

In this embodiment, as shown in fig. 2 to 5, two insulation sleeves 70 are provided, which are respectively provided at two ends of the core stator 50 and can cover the end portions of the core stator 50 to separate the coil 60 from the core stator 50.

As shown in fig. 2 and fig. 3, the insulating sleeve 70 includes a first abutting plate portion 71, a plurality of second abutting plate portions 72, a plurality of third abutting plate portions 73, a blocking portion 74 and a plurality of supporting portions 75, which are integrally formed or fixedly connected.

As shown in fig. 2 and 3, the first abutting plate portion 71 has a circular plate shape and matches with the outer peripheral portion 51 of the core stator 50. When the insulating sleeve 70 is sleeved at the end of the core stator 50, the first abutting plate portion 71 is attached to the end face of the outer peripheral portion 51 of the core stator 50.

As shown in fig. 2 and 3, the second abutting plate portion 72 corresponds to the guiding portion 52, is formed on the inner wall of the first abutting plate portion 71 in a protruding manner, and is flush with the first abutting plate portion 71 to form a plate shape. The shape, number, and distribution position of the second abutting plate portion 72 are matched with those of the guiding portion 52. When the insulating sleeve 70 is sleeved on the end of the core stator 50, the second abutting plate portion 72 is attached to the end surface of the guiding portion 52 of the core stator 50.

As shown in fig. 2 and 3, the third abutting plate portion 73 corresponds to the magnetic shoe portion 53, is formed at an end portion of the second abutting plate portion 72, and is flush with the second abutting plate portion 72 to form a plate shape. The shape, number, and distribution position of the third abutting plate portion 73 are all matched with the magnetic shoe portion 53. When the insulating sleeve 70 is sleeved at the end of the core stator 50, the third abutting plate 73 is attached to the magnetic shoe 53 of the core stator 50.

As shown in fig. 2 and 3, the blocking portion 74 is formed to surround the side surfaces of the outer peripheral portion 51, the guide portion 52, and the magnetic shoe portion 53 of the core stator 50, and is formed by vertically extending the inner sides of the first abutting plate portion 71, the second abutting plate portion 72, and the third abutting plate portion 73, so that a plurality of frame-like structures 741 are formed at intervals. The blocking portion 74 is perpendicular to the first abutting plate portion 71, the second abutting plate portion 72, and the third abutting plate portion 73, and the height thereof can be set as required. In this embodiment, the blocking portion 74 includes 6 frame-shaped structures 741, and the shape of each frame-shaped structure 741 is identical to the shape of the hollow structure 54 enclosed by the peripheral portion 51, the guide portion 52, and the magnetic shoe portion 53. When the insulating sleeve 70 is sleeved at the end of the core stator 50, the blocking portion 74 is attached to the side walls of the peripheral portion 51, the guiding portion 52, and the magnetic shoe portion 53.

As shown in fig. 2 and 3, the supporting portion 75 is formed on one side surface of the first abutting plate portion 71 in a protruding manner, and is located on two sides of the first abutting plate portion 71 with the blocking portion 74. The support portion 75 may serve as a support fixing. When the insulating sleeve 70 is sleeved at the end of the core stator 50, the supporting portion 75 abuts against the inner wall of the housing 10, so that the core stator 50 can be supported in the housing 10 in a suspended manner.

Further, as shown in fig. 4, in order to limit the movement of the iron core rotor 30 in the axial direction, a sleeve 90 may be further sleeved on the central rotating shaft 20. One end of the sleeve 90 abuts against the end surface of the core rotor 30, and the other end abuts against the first bearing 81.

From this, just formed the utility model discloses a miniature brushless motor device: as shown in fig. 1 to 5, the central shaft 20 is rotatably disposed in the housing 10, one end of the central shaft extends out of the housing 10, and the other end of the central shaft is provided with a limiting portion 21 to form a limiting fit with a limiting hole 121 in the housing 10, so as to limit the rotation angle of the central shaft 20; the iron core rotor 30 is sleeved on the central rotating shaft 20 and can synchronously rotate; the magnet group 40 is arranged on the iron core rotor 30 and can move together; the core stator 50 surrounds the core rotor 30, and the magnetic shoe portion 53 faces the core rotor 30 and is spaced from the core rotor 30; the coil 60 is wound on the guiding part 52 of the iron core stator 50, and both ends of the coil 60 can be led out from the lead hole 13 on the shell 10 for wiring; the insulating sleeves 70 are provided at both ends of the core stator 50 between the coils 60 and the core stator 50.

The utility model discloses a miniature brushless motor device's theory of operation as follows:

as shown in fig. 5, when the coil 60 is energized with a working power source, such as a positive and negative square wave power source, the core stator 50 is induced to generate magnetic poles at the magnetic shoe portions 53. When the direction of the current on the coil 60 is changed alternately, the magnetic poles of the magnetic shoe portions 53 are changed alternately, so as to alternately attract or repel the corresponding magnetic poles in the magnet group 40, thereby driving the magnet group 40 to rotate, and further driving the iron core rotor 30 and the central rotating shaft 20 to rotate back and forth, so that high-frequency vibration can be output outwards through the positioning connection portion 24. When the iron core rotor 30 and the central rotating shaft 20 rotate reciprocally, the limiting portion 21 at the end of the central rotating shaft 20 can rotate to the extent of interfering with the limiting hole 121 of the housing 10, so as to prevent the iron core rotor 30 from continuing to rotate, so as to restrict the rotation angle of the iron core rotor 30. Compared with the prior art, the utility model discloses a miniature brushless motor device can provide bigger drive power, and the deflection angle is littleer more reliable, therefore the high-frequency vibration performance is better.

While the invention has been described with reference to the above embodiments, the scope of the invention is not limited thereto, and the above components may be replaced with similar or equivalent elements known to those skilled in the art without departing from the concept of the invention.

Claims (10)

1. A miniature brushless motor device comprises a shell (10), a central rotating shaft (20), an iron core rotor (30), a magnet group (40), an iron core stator (50) and a coil (60), wherein the iron core rotor (30) is sleeved on the central rotating shaft (20) and can synchronously rotate, the magnet group (40) is arranged on the iron core rotor (30), the iron core stator (50) surrounds the iron core rotor (30) and is fixedly arranged in the shell (10), the coil (60) is arranged on the iron core stator (50), the miniature brushless motor device is characterized in that a limiting hole (121) is formed in the shell (10), one end of the central rotating shaft (20) is inserted in the limiting hole (121) and can restrict the rotating angle of the central rotating shaft (20) through the limiting hole (121).

2. The miniature brushless motor apparatus according to claim 1, wherein one end of the central shaft (20) is provided with a limiting portion (21), the limiting hole (121) is a rectangular hole, the size of the rectangular hole is larger than the size of the limiting portion (21), and the limiting portion (21) is inserted into the limiting hole (121) and is movable in the limiting hole (121).

3. The miniature brushless motor apparatus of claim 2,

the shell (10) comprises a cylinder body (11) and an end cover (12) which are connected in an involutory manner;

a central through hole (111) is formed in the cylinder body (11), a groove (122) opposite to the central through hole (111) is formed in the end cover (12), and the bottom of the groove (122) is provided with the limiting hole (121);

one end of the central rotating shaft (20) penetrates through the central through hole (111) and extends out of the cylinder body (11), and the other end of the central rotating shaft (20) penetrates through the groove (122) and is inserted into the limiting hole (121);

a first bearing (81) is arranged between the central rotating shaft (20) and the central through hole (111), and a second bearing (82) is arranged between the central rotating shaft (20) and the groove (122).

4. The miniature brushless motor device according to claim 3, wherein an even number of axially disposed magnet slots (31) are uniformly provided on said core rotor (30), and said magnet group (40) comprises an even number of bar magnets, said magnets being respectively embedded in said magnet slots (31).

5. The miniature brushless motor device according to claim 4, wherein said core stator (50) comprises:

a cylindrical outer peripheral portion (51) which is bonded to the inner wall of the cylindrical body (11);

a plurality of guide parts (52) which are formed on the inner wall of the peripheral part (51) in a protruding way, wherein the number of the guide parts (52) is consistent with that of the magnet slots (31);

and a plurality of magnetic shoes (53) provided at the end of the guide portion (52) and facing the core rotor (30), wherein the magnetic shoes (53) are spaced apart from the outer peripheral portion (51) and the core rotor (30).

6. The miniature brushless motor device according to claim 5, wherein an insulating sleeve (70) is provided between the core stator (50) and the coil (60), the insulating sleeve (70) covering both end portions of the core stator (50) to isolate the coil (60) from the core stator (50).

7. The miniature brushless motor device according to claim 6, wherein said insulating sleeve (70) comprises:

a first abutting plate portion (71) having a disc shape and matching with the outer peripheral portion (51) of the core stator (50);

a plurality of second abutting plate parts (72) which are formed on the inner wall of the first abutting plate part (71) in a protruding way, and the shapes and the number of the second abutting plate parts are matched with those of the guide parts (52);

a plurality of third abutting plate parts (73) formed on the end part of the second abutting plate part (72), the shape and the number of the third abutting plate parts are matched with the magnetic shoe parts (53);

and the blocking parts (74) vertically extend from the inner sides of the first abutting plate part (71), the second abutting plate part (72) and the third abutting plate part (73) to form a plurality of mutually-spaced frame-shaped structures (741).

8. The miniature brushless motor device of claim 7, wherein said insulating sleeve (70) further comprises:

and the supporting part (75) is formed on one side surface of the first abutting plate part (71) in a protruding mode, and is located on two sides of the first abutting plate part (71) together with the blocking part (74).

9. The miniature brushless motor apparatus of claim 8,

the first abutting plate part (71), the second abutting plate part (72) and the third abutting plate part (73) are attached to the end face of the iron core stator (50);

the blocking part (74) is attached to the inner wall of the peripheral part (51), the side wall of the guide part (52) and the inner wall of the magnetic shoe part (53);

the support (75) abuts against the inner wall of the housing (10).

10. The miniature brushless motor device according to claim 3, wherein a sleeve (90) is fitted over the central rotating shaft (20), one end of the sleeve (90) abutting against an end of the core rotor (30) and one end abutting against the first bearing (81).

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