Low-noise motor stator

Abstract

The utility model relates to a low-noise motor stator. A tooth crown of the motor stator is provided with stator auxiliary grooves. When the number of the motor slots is an even number, at least one stator auxiliary slot is provided; when the number of the motor slots is an odd number, the number of the stator auxiliary slots is at least two. Compared with the prior art, different numbers of stator auxiliary slots are arranged on the tooth crown according to different slot numbers of the motor stator, so that targeted optimization of the motor stators with different slot numbers is realized, noise during operation of the motor stators can be effectively reduced, and the working performance of the motor is improved; the stator slots in three shapes of rectangle, arc and triangle are arranged, so that targeted adjustment and selection can be carried out; and the positions of the plurality of stator slots are set, so that the performance of the motor is further optimized.

Description

Technical Field

[0001] The utility model relates to a motor stator, in particular to a low-noise motor stator. Background Art

[0002] The motor stator is an important part of the motor. The tooth crown of the motor stator is a structure located on the outer peripheral wall of the stator core, and usually jointly defines a slot structure for installing the coil winding with the stator body. The structural design of the tooth crown can affect the magnetic resistance and thrust fluctuation of the motor, and further affect the working performance of the motor.

[0003] After retrieval, the application publication number CN102780366A discloses a new type of three-phase asynchronous motor, specifically discloses: including a motor body, a stator and a rotor are arranged in the motor body, a plurality of stator slots are uniformly arranged in the circumferential direction of the stator, and a plurality of rotor slots are uniformly arranged in the circumferential direction of the rotor. The ratio of the number of stator slots to the number of rotor slots is 5:4. A plurality of small slots I are uniformly arranged on the fixed tooth circumferential surface of the stator slot, and a plurality of small slots II are uniformly arranged on the rotating tooth circumferential surface of the rotor slot.

[0004] However, the prior art does not perform targeted optimization for different design situations of the motor stator. Therefore, how to design a motor stator that can be targeted optimized according to the actual situation is a technical problem to be solved. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a low-noise motor stator to overcome the defect of poor working performance of the motor existing in the above prior art.

[0006] The purpose of the utility model can be realized by the following technical solutions:

[0007] According to one aspect of the utility model, a low-noise motor stator is provided. A stator auxiliary slot is opened on the tooth crown of the motor stator; when the number of motor slots is even, the stator auxiliary slot is at least one; when the number of motor slots is odd, the stator auxiliary slot is at least two.

[0008] As a preferred technical solution, the shape of the stator auxiliary slot is rectangular.

[0009] As a preferred technical solution, the shape of the stator auxiliary slot is arc.

[0010] As a preferred technical solution, the radius of each stator auxiliary slot is 0.5 mm.

[0011] As a preferred technical solution, the radius of each stator auxiliary slot is 1 mm.

[0012] As a preferred technical solution, the number of the stator auxiliary slots is three.

[0013] As a preferred technical solution, one of the three stator auxiliary slots is opened in the middle of the tooth crown, and the other two are symmetrically opened on both sides of the tooth crown with the central axis of the tooth crown as the axis of symmetry.

[0014] As a preferred technical solution, the angle formed by the connection line between the centers of the auxiliary slots opened on both sides of the tooth crown and the center of the stator is 1°19′.

[0015] As a preferred technical solution, the shape of the stator auxiliary slot is triangular.

[0016] As a preferred technical solution, the stator auxiliary slots are arranged at equal intervals on the tooth crown of the motor stator.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1) The utility model opens different numbers of stator auxiliary slots on the tooth crown according to different numbers of slots of the motor stator, which can realize the targeted optimization of the motor stator with different numbers of slots, effectively reduce the noise during the operation of the motor stator, and improve the working performance of the motor;

[0019] 2) The utility model sets stator slots in three shapes of rectangle, arc and triangle, which can be adjusted and selected targetedly;

[0020] 3) The utility model sets the positions of multiple stator slots to further optimize the performance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of a low-noise motor stator of the utility model;

[0022] Figure 2 It is a schematic diagram of the structure of a rectangular stator auxiliary slot of the utility model;

[0023] Figure 3 It is a schematic diagram of the structure of an arc-shaped stator auxiliary slot of the utility model;

[0024] Figure 4 It is a schematic diagram of the structure of a triangular stator auxiliary slot of the utility model;

[0025] Figure 5 It is a schematic diagram of the structure of an arc-shaped stator auxiliary slot with a radius of 0.5 mm of the utility model;

[0026] Figure 6 It is a schematic diagram of the structure of an arc-shaped stator auxiliary slot with a radius of 1 mm of the utility model;

[0027] Figure 7 It is a schematic diagram of the opening positions of three stator auxiliary slots of the utility model. Detailed implementation mode

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] The present invention provides a low-noise motor stator, and a stator auxiliary groove is provided on the tooth crown of the motor stator; when the number of motor slots is even, the stator auxiliary groove is at least one; when the number of motor slots is odd, the stator auxiliary groove is at least two.

[0030] The principle of reducing the holding slot torque by opening the auxiliary groove is equivalent to increasing the number of fundamental wave periods of the cogging torque. The new cogging torque of the auxiliary groove compensates for the cogging torque of the original slot opening, thereby reducing the amplitude of the total cogging torque.

[0031] As Figures 2 to 4 shown, the shape of the stator auxiliary groove can be selected as rectangular, arc or triangular.

[0032] As Figure 5 and Figure 6 shown, when the stator auxiliary groove is an arc, the radius of the stator auxiliary groove can be selected as 0.5 mm or 1 mm, preferably 1 mm.

[0033] One or more stator auxiliary grooves can be provided on each tooth crown, preferably three. Less than three has an unclear effect, and more than three is inconvenient for processing. Multiple stator auxiliary grooves can be arranged at equal intervals for easy processing.

[0034] As Figure 7 shown, one of the three stator auxiliary grooves is provided in the middle of the tooth crown, and the other two are symmetrically provided on both sides of the tooth crown. The included angle formed by the connection line between the centers of the two auxiliary grooves provided on both sides of the tooth crown and the stator center is preferably 1°19′.

[0035] The simulation data of the stator with different-shaped stator auxiliary grooves at different speeds are shown in Table 1, where position 1 is when the included angle of the three stator auxiliary grooves is 59′, and position 2 is when the included angle of the three stator auxiliary grooves is 1°19′. The simulation data is the magnitude of the electromagnetic force density of the stator auxiliary groove. The smaller the value, the better the weakening effect on the tooth harmonics of the motor. It can be seen from the table that when the auxiliary groove is rectangular or arc-shaped, the electromagnetic force density of the stator auxiliary groove is smaller; when the radius of the arc-shaped auxiliary groove is 1 mm, the electromagnetic force density of the stator auxiliary groove is smaller; when the included angle of the three stator auxiliary grooves is 1°19′, the electromagnetic force density of the stator auxiliary groove is smaller.

[0036] Table 1 Simulation data of stator auxiliary slots with different shapes at different stator speeds (unit: N / m 2 )

[0037]

[0038]

[0039] The present utility model sets stator auxiliary slots, which can significantly weaken the tooth harmonics of the motor, reduce the radial electromagnetic force, and improve the NVH performance of the motor; it can improve the cogging torque of the motor, thereby improving the positioning accuracy and control accuracy of the motor; it can improve the torque ripple of the motor, thereby improving the smoothness of the motor operation and preventing the vehicle from jittering during operation.

[0040] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. A low-noise motor stator, characterized in that, The tooth crown of the motor stator is provided with stator auxiliary slots; when the number of slots of the motor is even, there is at least one stator auxiliary slot; when the number of slots of the motor is odd, there are at least two stator auxiliary slots.

2. The low-noise motor stator according to claim 1, wherein The shape of the stator auxiliary slot is rectangular.

3. The stator of a low-noise motor according to claim 1, wherein The shape of the stator auxiliary slot is circular arc.

4. A low-noise motor stator according to claim 3, characterized in that, The radius of each stator auxiliary slot is 0.5 mm.

5. The stator of a low-noise motor according to claim 3, characterized in that The radius of each stator auxiliary slot is 1 mm.

6. The stator of a low-noise motor according to claim 1, wherein, There are three stator auxiliary slots.

7. The stator of a low-noise motor according to claim 6, wherein One of the three stator auxiliary slots is opened in the middle of the tooth crown, and the other two are symmetrically opened on both sides of the tooth crown with the central axis of the tooth crown as the axis of symmetry.

8. A low-noise motor stator according to claim 7, characterized in that, The angle formed by the connection line between the center of the auxiliary slot opened on both sides of the tooth crown and the center of the stator is 1°19′.

9. A low-noise motor stator according to claim 1, wherein The shape of the stator auxiliary slot is triangular.

10. A low-noise motor stator according to claim 1, characterized in that, The stator auxiliary slots are arranged at equal intervals on the tooth crown of the motor stator.

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