CN216564666U

CN216564666U - Motor

Info

Publication number: CN216564666U
Application number: CN202123110353.1U
Authority: CN
Inventors: 王军
Original assignee: Nidec Dongguan Co Ltd
Current assignee: Nideco Electric Dongguan Co ltd
Priority date: 2021-12-13
Filing date: 2021-12-13
Publication date: 2022-05-17
Anticipated expiration: 2031-12-13

Abstract

The utility model relates to the technical field of motors, and provides a motor which comprises a stator and a rotor; the stator comprises a stator iron core and a circuit board, wherein the stator iron core is formed by laminating a plurality of silicon steel sheets; the stator core comprises a cylindrical part and a plurality of stator teeth which are uniformly distributed in the circumferential direction of the cylindrical part; the outer end faces of the stator teeth adopt cambered surfaces; the outer end faces among the plurality of stator teeth have different circle centers; and the outer end surface of each stator tooth is provided with at least one auxiliary groove which is radially recessed. A center circle is formed between the centers of the outer end surfaces of the plurality of stator teeth. The utility model can improve the noise, vibration and efficiency of high load area of the motor and reduce the cost of the motor.

Description

Motor

Technical Field

The utility model relates to the technical field of motors, in particular to a motor.

Background

Motors and fans using the motors are widely used in various electric appliances such as refrigerators, washing machines, air conditioners, clocks, etc., which are in contact with daily work and life.

In the existing external rotor motor, a single-phase motor and a three-phase motor are common, the magnetic circuit structure of the single-phase motor is usually 4-slot 4-pole, and saddle waveform magnetizing is adopted; the magnetic circuit of the three-phase motor is constructed into 12 slots and 10 poles and is magnetized by adopting a saddle waveform. The existing three-phase motor has higher cost; the existing single-phase motor has poor vibration noise, low high-load efficiency and low cost compared with an AC motor. In addition, the stator core of the motor needs to be provided with an insulating part, so that the cost is high, and the axial height is also high.

SUMMERY OF THE UTILITY MODEL

The utility model mainly solves the technical problems of poor vibration noise, low high-load efficiency, low cost compared with an AC motor and the like of a single-phase motor in the prior art, and provides a motor to improve the noise, vibration and efficiency of a high-load area of the motor and reduce the cost of the motor.

The utility model provides a motor, comprising a stator and a rotor;

the stator comprises a stator iron core and a circuit board, wherein the stator iron core is formed by laminating a plurality of silicon steel sheets;

the stator core comprises a cylindrical part and a plurality of stator teeth which are uniformly distributed in the circumferential direction of the cylindrical part;

the outer end faces of the stator teeth adopt cambered surfaces; the outer end faces among the plurality of stator teeth have different circle centers;

and the outer end surface of each stator tooth is provided with at least one auxiliary groove which is radially recessed.

Preferably, when the stator tooth has an auxiliary groove, the auxiliary groove is located at a position intermediate to the outer end face of the stator tooth.

Preferably, when the stator tooth has two auxiliary grooves, the two auxiliary grooves are respectively adjacent to both ends of the stator tooth.

Preferably, the centers of the outer end surfaces of the plurality of stator teeth form a center circle.

Preferably, the number of the stator teeth is eight.

Preferably, the surface of the stator core is coated with an insulating layer.

Preferably, the cylindrical part is provided with a shaft hole for mounting the bearing sleeve, and a plurality of grooves for positioning and limiting the bearing sleeve are reserved in the shaft hole.

Preferably, the rotor has a rotor magnet, and the rotor magnet is magnetized by a sine wave.

Compared with the prior art, the motor provided by the utility model has the following advantages:

1. the outer rotor single-phase motor and the single-phase driving circuit are adopted, and cost is effectively reduced compared with the existing three-phase motor.

2. The magnetic circuit structure is arranged as 8 slots and 8 poles, and the stator core has stator teeth with auxiliary notches, improving noise and vibration and efficiency in high load areas.

3. The outer end faces between the stator teeth are not concentric, but the circle centers are on the same circle, so that uniform eccentricity is realized, a starting dead point is prevented, and the rotating noise of the motor can be reduced.

4. The surface of the stator core is coated with an insulating layer (compared with the existing single phase), and the insulating layer is used for replacing an insulating piece, so that the axial height can be reduced, and the cost can be reduced. The lamination thickness of the stator core is reduced, the material grade is reduced, the thickness of the permanent magnet is reduced, and the cost can be effectively reduced. And the matched coil on the stator core is made of copper-clad aluminum, so that the cost is effectively reduced.

5. The motor magnetizing jig is redesigned, saddle waveforms are changed into sine waves, noise vibration of the motor is effectively improved, and the efficiency of a high-load area is effectively improved through the optimized design of the shape and the magnetization of the stator iron core.

6. The motor of the utility model has low cost and excellent noise and vibration, and can be applied to electric fans and other industries.

Drawings

Fig. 1 is a schematic structural view of a stator core of a motor provided by the present invention;

FIG. 2 is a schematic diagram comparing the magnetization signal of the present invention with that of the prior art;

fig. 3 is a schematic diagram comparing the efficiency of the present invention with the high load area of the prior art.

Reference numerals: 1. a cylindrical portion; 2. stator teeth; 3. an auxiliary groove; 4. a groove; 5. a central circle.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings.

As shown in fig. 1, a motor provided by an embodiment of the present invention includes a stator and a rotor;

the stator core comprises a cylindrical part 1 and a plurality of stator teeth 2 uniformly distributed in the circumferential direction of the cylindrical part 1; the plurality of stator teeth 2 are not connected to each other, but have a gap.

The outer end surfaces of the stator teeth 2 adopt cambered surfaces; the outer end faces between the plurality of stator teeth 2 have different circle centers; a center circle 5 is formed among the centers of the outer end surfaces of the stator teeth 2, and the center circle 5 is drawn by adopting a dotted line in order to more clearly show the center relation of the outer end surfaces of the stator teeth 2 instead of an actual structure. The outer end faces between the stator teeth 2 are not concentric, but the circle centers are on the same circle, so that uniform eccentricity is realized, a starting dead point is prevented, and the rotating noise of the motor can be reduced.

The outer end face of the stator tooth 2 is provided with at least one auxiliary groove 3 which is recessed in the radial direction. Specifically, when the stator tooth 2 has one auxiliary groove 3, the auxiliary groove 3 is located at a middle position of the outer end surface of the stator tooth 2. When the stator tooth 2 has two auxiliary grooves 3, the two auxiliary grooves 3 are respectively close to both ends of the stator tooth 2. In the motor of the embodiment, the auxiliary grooves 3 are additionally arranged while the peripheries of the stator teeth 2 are not in the same circumference, so that the cogging torque can be reduced, the noise and vibration of the motor can be effectively improved, and the starting characteristic of the motor can be improved.

In the motor of the present embodiment, the number of the stator teeth 2 is eight, and an 8-slot 8-pole magnetic circuit structure is formed, so that the number of the stator teeth 2 is increased, and the efficiency in the load field is improved.

The surface of the stator core is coated with the insulating layer, and the insulating layer is used for replacing an insulating part, so that the axial height can be reduced, and the cost can be reduced.

The cylindrical part 1 is provided with a shaft hole for mounting a bearing sleeve, and a plurality of grooves 4 for positioning and limiting the bearing sleeve are reserved in the shaft hole, so that the structure is stable in operation.

Further, the rotor has a rotor magnet that is magnetized by a sine wave. The sine wave magnetizing reduces noise and vibration relative to saddle magnetizing. The motor magnetizing jig of the embodiment is redesigned, and as can be seen from fig. 2, the density of the changed magnetic beam is changed stably and the magnetization is more uniform, so that the saddle waveform is changed into a sine wave, and the noise vibration of the motor is effectively improved. It can be seen from fig. 3 that the efficiency of the high-load region is obviously increased after the change of the utility model, and the efficiency of the high-load region is effectively improved through the optimized design of the shape and the magnetization of the iron core.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: modifications of the technical solutions described in the embodiments or equivalent replacements of some or all technical features may be made without departing from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A motor comprising a stator and a rotor;

the method is characterized in that:

the stator core comprises a cylindrical part (1) and a plurality of stator teeth (2) which are uniformly distributed in the circumferential direction of the cylindrical part (1);

the outer end faces of the stator teeth (2) adopt cambered surfaces; the outer end faces among the plurality of stator teeth (2) have different circle centers;

the outer end face of each stator tooth (2) is provided with at least one auxiliary groove (3) which is recessed in the radial direction.

2. A motor according to claim 1, characterized in that, when the stator tooth (2) has one auxiliary groove (3), the auxiliary groove (3) is located at a middle position of the outer end surface of the stator tooth (2).

3. The motor according to claim 1, characterized in that, when the stator tooth (2) has two auxiliary grooves (3), the two auxiliary grooves (3) are respectively close to both ends of the stator tooth (2).

4. A motor according to claim 1 or 2, characterized in that the centres of the outer end surfaces of a plurality of stator teeth (2) form a centre circle (5) between them.

5. The motor according to claim 4, characterized in that the number of stator teeth (2) is eight.

6. A motor according to claim 4, characterized in that the stator core surface is coated with an insulating layer.

7. The motor according to claim 4, characterized in that the cylindrical part (1) has a shaft hole for mounting the bearing sleeve, in which shaft hole a plurality of grooves (4) for positioning and limiting the bearing sleeve are left.

8. The motor of claim 4, wherein the rotor has rotor magnets that are magnetized by a sine wave.