CN219875220U

CN219875220U - Motor and electric equipment

Info

Publication number: CN219875220U
Application number: CN202321132674.8U
Authority: CN
Inventors: 侯唯敏; 聂鹏举
Original assignee: Collier Electric Machinery Group Co ltd
Current assignee: Collier Electric Machinery Group Co ltd
Priority date: 2023-05-11
Filing date: 2023-05-11
Publication date: 2023-10-20
Anticipated expiration: 2033-05-11

Abstract

The utility model belongs to the technical field of electromagnetism, and relates to a motor and electric equipment, wherein the motor comprises a stator and a rotor which are oppositely arranged; the stator comprises a stator yoke and a stator winding, the rotor comprises a rotor yoke, the stator yoke and the rotor yoke are oppositely arranged, and a space exists between opposite surfacesThe stator yoke part is provided with a plurality of stator teeth which are arranged at intervals along the circumferential direction on the surface corresponding to the gap, a stator groove is formed between two adjacent stator teeth, and a stator winding is wound in the stator groove; a plurality of rotor teeth which are arranged at intervals along the circumferential direction are arranged on the surface of the rotor yoke part corresponding to the gap, a rotor groove is formed between two adjacent rotor teeth, and a first permanent magnet is arranged in the rotor groove; the motor satisfies the relation: n (N) _s ＝k×n×m；N _r The rotor and the stator generate higher harmonic magnetic fields to generate torque respectively, reduce torque cancellation in the motor, the torque density of the motor is improved, the cost of the motor is reduced, and the torque fluctuation of the motor is greatly reduced.

Description

Motor and electric equipment

Technical Field

The utility model belongs to the technical field of electromagnetic devices, and particularly relates to a motor and electric equipment.

Background

The direct drive motor is a direct drive motor for short, and mainly refers to a motor which directly drives a load shaft to rotate under the condition that a transmission device (such as a transmission belt and the like) is not needed when the motor drives a load. The direct-drive motor has the advantages of silence, energy conservation, stability, simple mechanical connection structure, strong torque and the like, so the direct-drive motor is suitable for various washing machine driving devices, electric bicycle driving devices, electric motorcycle driving devices and the like.

With the rapid development of society and technology, the demand for direct drive motors capable of outputting large torque density is increasing. However, the existing direct-drive motor still cannot meet the demands of people in terms of torque density.

Disclosure of Invention

The utility model aims to provide a motor and electric equipment to solve the technical problem that the existing direct-drive motor cannot meet the demands of people in torque density.

In order to achieve the above purpose, the utility model adopts the following technical scheme: providing an electric machine comprising a stator and a rotor arranged opposite to each other; the stator comprises a stator yoke part and a stator winding, the rotor comprises a rotor yoke part and a first permanent magnet, gaps exist between opposite surfaces of the stator yoke part and the rotor yoke part, a plurality of stator teeth which are arranged at intervals along the circumferential direction are distributed on the surface of the stator yoke part corresponding to the gaps, a stator groove is formed between two adjacent stator teeth, and the stator winding is wound in the stator groove;

a plurality of rotor teeth which are arranged at intervals along the circumferential direction are arranged on the surface of the rotor yoke part corresponding to the gap, a rotor groove is formed between two adjacent rotor teeth, and the first permanent magnet is arranged in the rotor groove;

the motor satisfies the following relation:

N _s ＝k×n×m；

N _r ＝k×(n×m+2)；

wherein N is _s N being the number of stator teeth _r The number of the rotor poles is positive even, n is positive odd and is more than or equal to 3, and m is the number of phases of the stator winding and is a positive integer which is more than or equal to 3.

In an embodiment, the radial height of the first permanent magnet is equal to the radial height of the rotor teeth; the rotor teeth are made of ferromagnetic materials, or the rotor teeth are made of permanent magnetic materials, and the polarity of a magnetic field generated by the rotor teeth is opposite to that of a magnetic field generated by the first permanent magnet.

In an embodiment, the rotor teeth are made of ferromagnetic materials, a second permanent magnet is arranged on the surface of the rotor teeth corresponding to the gap, the polarity of a magnetic field generated by the second permanent magnet is opposite to that of a magnetic field generated by the first permanent magnet, and the radial height of the first permanent magnet is equal to the sum of the radial height of the second permanent magnet and the radial height of the rotor teeth.

In an embodiment, the radial height of the second permanent magnet is equal to twice the radial height of the rotor teeth.

In one embodiment, N _s Equal to 36, N _r Equal to 44.

In one embodiment, a third permanent magnet is arranged in one side, close to the gap, of each stator slot; the magnetic field polarity generated by the third permanent magnet is the same as the magnetic field polarity generated by the first permanent magnet, or the magnetic field polarity generated by the third permanent magnet is the same as the magnetic field polarity generated by the second permanent magnet.

In an embodiment, the outer surface of the stator teeth facing the gap is a first curved surface, in the circumferential direction, the distance from a point on the first curved surface to the center of a circle gradually decreases from the middle of the first curved surface to two ends, and the radius difference of each point is between 0 and 5 mm; and/or the number of the groups of groups,

the outer surface of the first permanent magnet facing the gap is a second curved surface, the distance from a point on the second curved surface to the circle center gradually increases from the middle of the second curved surface to two ends in the circumferential direction, and the radius difference of each part is 0-5 mm; and/or the number of the groups of groups,

the outer surface of the second permanent magnet facing the gap is a third curved surface, the distance from a point on the third curved surface to the circle center gradually increases from the middle of the third curved surface to two ends of the third curved surface in the circumferential direction, and the radius difference of each part is 0-5 mm; and/or the number of the groups of groups,

the outer surface of the rotor teeth facing the gap is a fourth curved surface, the distance from a point on the fourth curved surface to the circle center gradually increases from the middle of the fourth curved surface to two ends in the circumferential direction, and the radius difference of each place is between 0 and 5 mm.

In an embodiment, the rotor further comprises a rotor support, the rotor support comprises a chassis for mounting the rotor yoke, the central area of the stator yoke is of an axially through hollow structure, a fan is fixed to the center of the chassis, and the fan is located in the hollow structure.

In an embodiment, the rotor support further comprises an annular disc, and a plurality of heat dissipation fan blades are arranged on the axial end face and/or the outer side wall of the annular disc.

The utility model also provides an electric device comprising the motor.

The motor provided by the utility model has the following beneficial effects: in the case of motor satisfying the relation N _s =k×n×m and N _r After k× (n×m+2), the numbers of the stator teeth, the rotor teeth, the first permanent magnets and the second permanent magnets can be reasonably configured, so that the higher harmonic magnetic fields generated by the rotor and the stator generate torque respectively, torque offset in the motor is reduced, the torque density of the motor is finally improved, the motor cost is reduced, and the torque fluctuation of the motor is greatly reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a perspective view of a motor according to an embodiment of the present utility model;

FIG. 2 is a front view of a motor according to an embodiment of the present utility model with a rotor support removed;

fig. 3 is a perspective view of a rotor bracket of a motor according to an embodiment of the present utility model;

fig. 4 is a schematic diagram showing a permanent magnet distribution in a motor according to an embodiment of the present utility model;

fig. 5 is a second schematic diagram of permanent magnet distribution in the motor according to the embodiment of the present utility model;

fig. 6 is a schematic diagram III of permanent magnet distribution in a motor according to an embodiment of the present utility model;

FIG. 7 is a graph of torque ripple of a prior art motor;

fig. 8 is a torque ripple graph of a motor according to an embodiment of the present utility model.

Wherein, each reference sign in the figure:

11-a stator yoke; 111-stator teeth; 1111—a first curved surface; 112-stator slots; 113-a third permanent magnet; 12-stator windings; 21-a rotor yoke; 211-rotor teeth; 213-a first permanent magnet; 214-a second permanent magnet; 22-rotor support; 221-chassis; 222-an annular disk; 223-a first fan blade; 224-second fan blades; 225-third fan blades; 3-gap; 4-a fan; 41-a body; 42-fan blades; 421-a first part; 422-second portion.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the utility model.

Furthermore, the terms "first," "second," "third," "fourth" and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", "a third" and a fourth "may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1 and 5, a motor provided by the present utility model will now be described, the motor including a stator and a rotor disposed opposite to each other; the stator comprises a stator yoke 11 and a stator winding 12, the rotor comprises a rotor yoke 21 and a first permanent magnet 213, gaps 3 exist between opposite surfaces of the stator yoke 11 and the rotor yoke 21, a plurality of stator teeth 111 which are arranged at intervals along the circumferential direction are distributed on the surface of the stator yoke 11 corresponding to the gaps 3, a stator groove 112 is formed between two adjacent stator teeth 111, and the stator winding 12 is wound in the stator groove 112.

The gap 3 between the stator yoke 11 and the rotor yoke 21 forms an air gap that allows relative movement between the stator and the rotor based on controlling the variation of the magnetic field generated by the stator windings 12. The stator and the rotor may be one or more, respectively, i.e. one or both sides of a certain stator may be provided with a rotor, or one or both sides of a certain rotor may be provided with a stator. When the motor includes a plurality of stators and/or a plurality of rotors, at least one of the stators and the rotors adopts the structure of the stators and the rotors in the embodiment of the utility model, and other stators or rotors can adopt the same or different structures as the stators or the rotors in the embodiment of the utility model, and the stator or the rotors can be specifically selected and arranged according to actual needs.

A plurality of rotor teeth 211 which are arranged at intervals along the circumferential direction are arranged on the surface of the rotor yoke part 21 corresponding to the gap 3, a rotor groove is formed between two adjacent rotor teeth 211, and a first permanent magnet 213 is arranged in the rotor groove;

the motor satisfies the following relationship:

N _s =k×n×m; (equation I)

N _r =k× (nxm+2); (equation II)

Wherein N is _s N is the number of stator teeth 111 _r The number of poles of the rotor; k is a positive even number, i.e., k can be 2, 4, 6 … …; n is a positive odd number and is 3 or more, i.e., n can be 3, 5, 7, … …; m is the number of phases of the stator winding 12 and is a positive integer greater than or equal to 3, that is, m can be 3, 4, 5 and … …, when m is greater than 3, if a phase of the motor is in a phase failure, other phases can still enable the motor to work, so that the fault tolerance of the motor in the phase failure can be improved.

In the present embodiment, the number of rotor poles N _r Equal to the sum of the number of rotor teeth 211 and the number of first permanent magnets 213, since the first permanent magnets 213 are disposed in the rotor grooves formed between the adjacent two rotor teeth 211, the number of rotor teeth 211 is the same as the number of first permanent magnets 213, that is, the number of rotor poles N _r Twice the number of rotor slots.

The torque and torque fluctuation range of the prior art motor is shown in fig. 7, wherein the average torque value of the racing motor is 19.6840Nm, and the torque fluctuation range is 5.5954Nm; fig. 8 shows the torque and torque fluctuation range of the motor according to the present utility model after satisfying the above first and second formulas, wherein the average torque value is 22.8333Nm and the torque fluctuation range is 0.3630Nm, and it is known that the torque density of the motor according to the present utility model is increased and the torque fluctuation is greatly reduced.

After the first and second formulas are satisfied, the numbers of the stator teeth 111, the rotor teeth 211 and the first permanent magnets 213 can be reasonably configured, so that the higher harmonic magnetic fields generated by the rotor and the stator generate moments respectively, the moment offset in the motor is reduced, the moment density of the motor is finally improved, the motor cost is reduced, and the moment fluctuation of the motor is greatly reduced.

In one embodiment, the radial height of the first permanent magnets 213 is equal to the radial height of the rotor teeth 211. As shown in fig. 5, the rotor teeth 211 are pieces of ferromagnetic material; alternatively, as shown in fig. 6, the rotor teeth 211 are pieces of permanent magnetic material, and the polarity of the magnetic field generated by the rotor teeth 211 is opposite to that of the magnetic field generated by the first permanent magnet 213.

When the rotor teeth 211 are made of ferromagnetic material, since the rotor yoke 21 is also made of ferromagnetic material, the material of the rotor teeth 211 may be the same as that of the rotor yoke 21, for example, the rotor yoke 21 and the rotor teeth 211 are made of silicon steel sheets, and at this time, the rotor yoke 21 and the rotor teeth 211 may be integrally formed or separately connected, and may be specifically selected according to actual needs; the material of the rotor teeth 211 may be the same as or different from that of the rotor yoke 21. For example, the rotor yoke 21 is made of iron, and the rotor yoke 21 is made of silicon steel sheet, and may be selectively arranged according to actual needs. When the rotor teeth 211 are magnetic conductive material pieces, the torque of the motor can be reduced by a small amount, and the use amount of permanent magnetic materials can be reduced, so that the cost of the motor is reduced.

When the rotor teeth 211 are made of permanent magnetic materials, an additional magnetic field can be added, which is beneficial to improving the moment of the motor and improving the performance of the motor.

Here, the term "radial direction" and "axial direction" as used herein refer to the radial direction and the axial direction of the sub-yoke 11, and also the radial direction and the axial direction of the rotor yoke 21.

When the rotor yoke 21 is made of silicon steel sheet, the rotor yoke 21 may be integrally formed, or may be formed by stacking and pressing after being punched and formed in a piece-by-piece manner, and may be selectively set according to actual needs.

In one embodiment, as shown in fig. 2, the rotor teeth 211 are made of ferromagnetic material, for example, silicon steel sheet or iron material, and may be selectively arranged according to practical needs. As shown in fig. 4, the rotor teeth 211 are provided with second permanent magnets 214 on the surfaces corresponding to the gaps 3, the polarities of the magnetic fields generated by the second permanent magnets 214 and the first permanent magnets 213 are opposite, and the radial height of the first permanent magnets 213 is equal to the sum of the radial height of the second permanent magnets 214 and the radial height of the rotor teeth 211. In this way, part of the second permanent magnet 214 can be replaced by the rotor teeth 211 of the same material as the rotor yoke 21.

The second permanent magnet 214 is arranged on the rotor teeth 211, so that on one hand, the second permanent magnet 214 can add an additional magnetic field, thereby being beneficial to improving the moment density or the tension density of the motor; on the other hand, the second permanent magnets 214 with different radial heights can generate different magnetic resistances, so that the relation among the moment, the iron loss and the power factor of the motor can be adjusted, the performance of the motor is improved, the moment of the motor is improved, and the application requirement range of the motor is enlarged.

When the radial height of the second permanent magnet 214 is infinitely close to zero, as shown in fig. 5, at this time, the rotor teeth 211 gradually replace the second permanent magnet 214, the radial height of the rotor teeth 211 is infinitely close to the radial height of the first permanent magnet 213, and the torque of the motor can be reduced by a small amount while the usage amount of permanent magnet materials is reduced, thereby reducing the cost of the motor; when the radial height of the rotor teeth 211 is infinitely close to zero, and at this time, the radial height of the second permanent magnet 214 is infinitely close to the radial height of the first permanent magnet 213, so that an additional magnetic field can be added, which is beneficial to improving the torque of the motor and improving the performance of the motor. In practical applications, the radial height of the second permanent magnet 214 and the radial height of the rotor teeth 211 may be adjusted according to practical needs.

Preferably, as shown in fig. 4, the radial height of the second permanent magnet 214 is equal to twice the radial height of the rotor teeth 211, at this time, the performance of the motor is almost unchanged from the performance when the radial height of the second permanent magnet 214 is equal to the radial height of the first permanent magnet 213, but the saturation density of the magnetic flux of the rotor yoke 21 in transition between the first permanent magnet 213 and the second permanent magnet 214 can be improved, the material consumption of the permanent magnets can be saved, and the cost of the motor can be reduced; meanwhile, the permanent magnet assembly device can be used as a fool-proof means, the first permanent magnet 213 and the second permanent magnet 214 can be conveniently positioned, the first permanent magnet 213 and the second permanent magnet 214 are prevented from being misplaced by an assembler, the qualification rate of the motor is improved, and the processing difficulty of the motor is reduced.

In one embodiment, N _s Equal to 36, N _r Equal to 44. Under the configuration, the test proves that the efficiency of the motor can be improved, the torque fluctuation of the motor is greatly reduced, the energy-saving effect of the motor is very good, and meanwhile, the motor has small vibration and is very quiet in the running process.

Since the rotor grooves are formed between the adjacent two rotor teeth 211, the number of rotor grooves is the same as the number of rotor teeth 211, that is, the number of first permanent magnets 213 is the same as the number of rotor teeth 211. When the second permanent magnets 214 are not disposed on the rotor teeth 211, the sum of the number of the rotor teeth 211 and the number of the first permanent magnets 213 is the number of rotor poles N _r The number of rotor teeth 211 is 22 and the number of first permanent magnets 213 is also 22. When the rotor teeth 211 are made of permanent magnet material and the radial height of the rotor teeth 211 is equal to the radial height of the first permanent magnets 213, i.e. the rotor teeth 211 completely replace the second permanent magnets 214, the sum of the number of the first permanent magnets 213 and the number of the rotor teeth 211 is the number of rotor poles N _r The number of first permanent magnets 213 is 22 and the number of rotor teeth 211 is also 22. When the second permanent magnet 214 is disposed on the rotor teeth 211 and the radial heights of the rotor teeth 211 and the second permanent magnet 214 are not zero, the sum of the numbers of the rotor teeth 211 and the first permanent magnet 213 or the sum of the numbers of the second permanent magnet 214 and the first permanent magnet 213 is the number of rotor poles N _r 。

In one embodiment, as shown in fig. 4 to 6, a third permanent magnet 113 is disposed at a side of each stator slot 112 near the gap 3; the magnetic field polarity of the third permanent magnet 113 is the same as that of the first permanent magnet 213, or the magnetic field polarity of the third permanent magnet 113 is the same as that of the second permanent magnet 214. By arranging the third permanent magnet 113 in the stator slot 112, the magnetic field strength of the air gap can be increased, which is beneficial to improving the torque density or the tensile force density of the motor and increasing the torque of the motor.

Since the stator winding 12 will generate heat after being electrified, when the third permanent magnet 113 is disposed on one side of the stator slot 112 close to the gap 3, if the third permanent magnet 113 is too close to the stator winding 12 wound in the stator slot 112, the third permanent magnet 113 will demagnetize in the magnetic field and high temperature environment, which affects the performance of the motor, so that the third permanent magnet 113 needs to be prevented from contacting the stator winding 12 as much as possible in practical application, and a reasonable distance can be set between the stator winding 12 and the third permanent magnet 113.

In practical applications, as shown in fig. 4 to 6, the distances from the center of the circle to the outer surface of the stator teeth 111 facing the gap 3 may be the same or different, and may be specifically selected according to practical needs. In this embodiment, the outer surface of the stator teeth 111 facing the gap 3 is a first curved surface 1111, the distance from the point on the first curved surface 1111 to the center of the circle gradually decreases from the middle of the first curved surface 1111 to the two ends, and the radius difference between each point is between 0 mm and 5mm, that is, the outer surface of the stator teeth 111 facing the gap 3 is shaped, so that the magnetic field intensity at the two ends of the first curved surface 1111 is smaller than the magnetic field intensity in the middle of the first curved surface 1111, the gap 3 between the two ends of the first curved surface 1111 and the rotor yoke 21 is increased, the sensitivity of the motor to the magnetic field change is reduced, and the torque fluctuation of the motor is reduced.

In practical application, the surface of the first permanent magnet 213 and/or the second permanent magnet 214 facing the gap 3 may be modified to reduce torque fluctuation of the motor, and the configuration may be specifically selected according to practical needs. For example, in some embodiments, the outer surface of the first permanent magnet 213 facing the gap 3 is a second curved surface, and the distance from the point on the second curved surface to the center of the circle increases gradually from the middle of the second curved surface to the two ends in the circumferential direction, and the radius difference is between 0 mm and 5mm everywhere; in some embodiments, the outer surface of the second permanent magnet 214 facing the gap 3 is a third curved surface, and the distance from the point on the third curved surface to the center of the circle gradually increases from the middle of the third curved surface to the two ends in the circumferential direction, and the radius difference between the points is 0-5 mm.

It will of course be appreciated that the surface of the rotor teeth 211 may also be profiled to reduce torque ripple of the motor, for example, in some embodiments the outer surface of the rotor teeth 211 facing the gap 3 is a fourth curved surface, the distance from the point on the fourth curved surface to the centre of the circle in the circumferential direction increases gradually from the centre of the fourth curved surface to both ends, and the difference in radius from each point is between 0 and 5 mm.

In an embodiment, as shown in fig. 1 and 3, the rotor further includes a rotor support 22, the rotor support 22 includes a chassis 221 for mounting the rotor yoke 21, a central area of the stator yoke 11 is a hollow structure penetrating axially, a fan 4 is fixed at the center of the chassis 221, and the fan 4 is located in the hollow structure. By fixing the fan 4 at the center of the chassis 221 of the rotor support 22, heat dissipation of the stator and the rotor can be accelerated, loss of the motor can be reduced, efficiency of the motor can be improved, and service life of the motor can be prolonged. In practical application, in order to accelerate heat dissipation of the motor, the chassis 221 may be provided with a plurality of heat dissipation grooves axially penetrating through the chassis 221, and the chassis 221 may be further configured into a hollow structure, which may be specifically selected according to practical needs.

In one embodiment, as shown in fig. 3, the fan 4 includes a main body 41 and a plurality of blades 42, the main body 41 is fixed to a central area of the chassis 221, each blade 42 includes a first portion 421 and a second portion 422 disposed on the chassis 221, the first portion 421 is disposed on an outer side wall of the main body 41 at intervals along a circumferential direction, the second portion 422 extends from the first portion 421 toward a direction away from the center of the chassis 221, and an axial height of the second portion 422 is smaller than an axial height of the first portion 421. The heat dissipation effect of the motor can be further improved by the second portion 422 extending from the first portion 421 in a direction away from the center of the chassis 221, and the second portion 422 can extend according to practical needs, for example, when there is an axial height difference between the stator yoke 11 and the chassis 221, the second portion 422 can extend below the stator winding 12, so that the second portion 422 can also accelerate the heat dissipation of the stator winding 12 when the chassis 221 follows the rotation of the rotor. It will be appreciated, of course, that additional protrusions may be provided on the second portion 422 to increase the heat dissipation effect, depending on the actual construction of the motor.

In an embodiment, as shown in fig. 1 and 3, the rotor support 22 further includes an annular disk 222, and a plurality of heat dissipation blades are disposed on an axial end surface and/or an outer sidewall of the annular disk 222.

In one embodiment, the heat dissipation fan comprises a plurality of first fan blades 223, wherein the plurality of first fan blades 223 are distributed on the chassis 221 at intervals along the circumferential direction, and the annular disc 222 is axially arranged at intervals with the chassis 221 and is connected with the plurality of first fan blades 223; the inner wall of the annular disc 222 is provided with an annular groove in which the rotor yoke 21 is located.

Specifically, the rotor yoke 21 is positioned in the annular groove of the annular disk 222, and the rotor yoke 21 can be protected by the annular disk 222. The annular disc 222 is axially spaced from the chassis 221 and connected through a plurality of first fan blades 223, so that when the rotor bracket 22 rotates, the annular disc 222, the chassis 221 and the plurality of first fan blades 223 rotate, and when the plurality of first fan blades 223 rotate, air flow between the annular disc 222 and the chassis 221 can be driven to accelerate heat dissipation of the motor; meanwhile, the annular disc 222 is axially spaced from the chassis 221, which is more beneficial to heat dissipation of the motor.

In an embodiment, as shown in fig. 1 and 3, the heat dissipation fan blade further includes a plurality of second fan blades 224 disposed at intervals along the circumferential direction, and the second fan blades 224 are disposed on an end surface of the annular disc 222 facing away from the first fan blades 223. Thus, when the rotor support 22 rotates, the plurality of second fan blades 224 rotate together to drive the air on one side of the annular disc 222 away from the first fan blades 223 to flow, so as to accelerate heat dissipation of the motor.

In an embodiment, as shown in fig. 1 and 3, the heat dissipation fan further includes a plurality of third fan blades 225 protruding from the outer sidewall of the annular disc 222 along the circumferential direction at intervals. Thus, when the rotor support 22 rotates, the plurality of third fan blades 225 rotate together to drive the air on one side of the annular disc 222 away from the center of the rotor yoke 21 to flow, so as to accelerate heat dissipation of the motor.

In an embodiment, the first fan blade 223, the second fan blade 224 and the third fan blade 225 correspond to each other in position, and two ends of the third fan blade 225 in the axial direction are respectively connected with the first fan blade 223 and the second fan blade 224. In this way, the processing of the first fan blade 223, the second fan blade 224 and the third fan blade 225 can be facilitated, preferably, the first fan blade 223, the second fan blade 224 and the third fan blade 225 are integrally formed with the annular disc 222, so that the manufacturing process of the motor is simplified, and the manufacturing difficulty of the motor is reduced.

The utility model also provides electric equipment comprising the motor. In particular, the electrically powered device may be an automated device or a semi-automated device. Here, the automatic apparatus or the semiautomatic apparatus is an apparatus applied to various fields, for example, fields of industry, education, nursing, home appliances, medical treatment, and the like. In one embodiment, the electrically powered device is a washing machine. In another embodiment, the electric device is an electric bicycle. In other embodiments, the electrically powered device is an electric motorcycle.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims

1. An electric machine is characterized by comprising a stator and a rotor which are oppositely arranged; the stator comprises a stator yoke part and a stator winding, the rotor comprises a rotor yoke part and a first permanent magnet, gaps exist between opposite surfaces of the stator yoke part and the rotor yoke part, a plurality of stator teeth which are arranged at intervals along the circumferential direction are distributed on the surface of the stator yoke part corresponding to the gaps, a stator groove is formed between two adjacent stator teeth, and the stator winding is wound in the stator groove;

the motor satisfies the following relation:

N _s ＝k×n×m；

N _r ＝k×(n×m+2)；

wherein N is _s N being the number of stator teeth _r Is the number of rotor poles, k is positive even number, n is positive odd number and is more than or equal to 3, m is the number of phases of the stator winding and is more thanA positive integer equal to 3.

2. The electric machine of claim 1, wherein a radial height of the first permanent magnet is equal to a radial height of the rotor teeth; the rotor teeth are made of ferromagnetic materials, or the rotor teeth are made of permanent magnetic materials, and the polarity of a magnetic field generated by the rotor teeth is opposite to that of a magnetic field generated by the first permanent magnet.

3. The motor of claim 1, wherein the rotor teeth are pieces of ferromagnetic material, a second permanent magnet is arranged on a surface of the rotor teeth corresponding to the gap, the polarity of a magnetic field generated by the second permanent magnet is opposite to that of a magnetic field generated by the first permanent magnet, and the radial height of the first permanent magnet is equal to the sum of the radial height of the second permanent magnet and the radial height of the rotor teeth.

4. A machine as claimed in claim 3, characterized in that the radial height of the second permanent magnet is equal to twice the radial height of the rotor teeth.

5. An electric machine as claimed in any one of claims 1 to 4, characterized in that N _s Equal to 36, N _r Equal to 44.

6. The motor of claim 3 or 4, wherein a third permanent magnet is provided in each of the stator slots at a side near the gap; the magnetic field polarity generated by the third permanent magnet is the same as the magnetic field polarity generated by the first permanent magnet, or the magnetic field polarity generated by the third permanent magnet is the same as the magnetic field polarity generated by the second permanent magnet.

7. A motor according to claim 3, wherein the outer surface of the stator teeth facing the gap is a first curved surface, the distance from the point on the first curved surface to the center of the circle in the circumferential direction gradually decreases from the middle of the first curved surface to two ends, and the radius difference is 0-5 mm; and/or the number of the groups of groups,

8. The motor of any one of claims 1 to 4, wherein the rotor further comprises a rotor bracket including a chassis for mounting the rotor yoke, a central region of the stator yoke is a hollow structure penetrated axially, a fan is fixed to a center of the chassis, and the fan is located in the hollow structure.

9. The motor of claim 8, wherein the rotor support further comprises an annular disk, and a plurality of heat dissipation blades are arranged on an axial end face and/or an outer side wall of the annular disk.

10. An electrically powered device comprising an electrical machine as claimed in any one of claims 1 to 9.