Low-noise permanent magnet motor stator structure

Abstract

The utility model relates to a low-noise permanent magnet motor stator structure, which belongs to the technical field of stator structures, and comprises a yoke part and a plurality of tooth parts, the tooth parts are arranged on the inner side of the yoke part, the plurality of tooth parts are arranged in a circumferential array by taking the axis of the yoke part as the center, and winding grooves are formed between the adjacent tooth parts. One end, away from the yoke part, of each tooth part is provided with a rectangular auxiliary groove, and the auxiliary grooves extend in the thickness direction of the yoke part. The permanent magnet motor has the effect of reducing the noise in the using process of the permanent magnet motor.

Description

Technical Field

[0001] This utility model relates to the technical field of stator structure, and in particular to a low-noise permanent magnet motor stator structure. Background Technology

[0002] The stationary part of a motor is called the stator, which is usually directly mounted on the motor housing. The rotatable part of a motor is called the rotor, which is usually mounted on the motor shaft via bearings or bushings. The stator is equipped with electromagnetic coils, and the rotor is equipped with permanent magnets. When three-phase alternating current is applied to the electromagnetic coils on the stator, a rotating magnetic field is generated. This rotating magnetic field interacts with the permanent magnets on the rotor to induce an electromotive force in the stator windings, thereby generating electromagnetic torque, which drives the motor to rotate.

[0003] Existing permanent magnet motors generate electromagnetic noise during operation, which can affect customers' acceptance and satisfaction with the motor they choose. Utility Model Content

[0004] In order to improve the noise of permanent magnet motors during use, this application provides a low-noise permanent magnet motor stator structure.

[0005] This application provides a low-noise permanent magnet motor stator structure, which adopts the following technical solution:

[0006] A low-noise permanent magnet motor stator structure includes a yoke and multiple teeth. The teeth are disposed inside the yoke and are arranged in a circumferential array with the axis of the yoke as the center. A winding groove is formed between adjacent teeth. An auxiliary groove in a rectangular shape is provided at the end of each tooth away from the yoke and extends along the thickness direction of the yoke.

[0007] By adopting the above technical solutions, the winding slot can effectively prevent the motor from moving or being damaged during operation, thus ensuring the normal use of the motor to a certain extent. The auxiliary slot not only effectively reduces cogging torque and torque pulsation, thus improving electromagnetic noise, but also increases stator eccentricity efficiency, reducing energy consumption and cost.

[0008] Preferably, the toothed portion includes a connecting portion and a tooth tip. The two ends of the connecting portion are respectively connected to the yoke and the tooth tip. The tooth tip includes two tooth shoes, which protrude circumferentially towards both sides of the connecting portion. The auxiliary groove includes a first groove and two second grooves. The first groove is located on the same straight line as the connecting portion. The second grooves are located on the tooth shoes, and the two second grooves are symmetrically arranged on both sides of the first groove.

[0009] Preferably, the angle between the first tank and the second tank is 7.2°.

[0010] Preferably, the inner radius of the tooth tip on the side away from the connecting part is 39.74 mm, the bottom radius of the auxiliary groove is 40.24 mm, the groove depth is 0.5 mm, and the groove width is 2 mm.

[0011] By adopting the above technical solution, the depth, width, position and number of auxiliary slots will affect the sine of the back electromotive force waveform, the magnitude of the cogging torque and the torque ripple value of the motor. The above data are the optimal results obtained through experiments, which can greatly reduce the electromagnetic noise of the motor.

[0012] Preferably, the outer side of the yoke is provided with a plurality of clearance grooves, and the plurality of clearance grooves are arranged in a circular array with the axis of the yoke as the center.

[0013] By adopting the above technical solution and setting the clearance groove, space is provided for other components inside the permanent magnet motor cover, effectively utilizing the space inside the motor housing.

[0014] Preferably, a winding mark groove is provided through the outer side of the yoke.

[0015] By adopting the above technical solution and setting the winding mark groove, positioning is provided for the installation of the electric winding coil.

[0016] Preferably, the end face of the yoke is provided with a plurality of rivet points for fixing the stator laminations, and the plurality of rivet points are arranged in a circular array with the axis of the yoke as the center.

[0017] By adopting the above technical solution, the rivet points are used to fix the stator laminations, making it difficult for the stator laminations to move during the operation of the permanent magnet motor, ensuring the tightness of the stator lamination connection, thereby improving the stability and efficiency of the permanent magnet motor.

[0018] Preferably, the end face of the yoke is provided with a through hole for fixing the stator frame.

[0019] By adopting the above technical solution, the stator frame is used to support and position the stator coil, ensuring that the stator coil is fixed in the proper position and that its position is accurate.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] 1. The auxiliary slot not only effectively reduces cogging torque and torque pulsation, thus improving electromagnetic noise, but also increases stator eccentricity efficiency, reducing energy consumption and cost.

[0022] 2. The depth, width, position, and number of auxiliary slots affect the sinusoidal nature of the motor's back EMF waveform, the magnitude of the cogging torque, and the torque ripple value. The above data are the optimal results obtained through experiments, which can greatly reduce the electromagnetic noise of the motor. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0024] Figure 2 This is a schematic cross-sectional view of the structure in an embodiment of this application.

[0025] Explanation of reference numerals in the attached drawings: 1. Yoke; 11. Clearance groove; 12. Rivet point; 13. Mounting through hole; 2. Tooth; 21. Auxiliary groove; 211. First groove; 212. Second groove; 22. Connecting part; 23. Tooth top; 24. Tooth shoe; 3. Winding groove; 4. Winding mark groove. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-2 The present invention will be described in further detail below.

[0027] This application discloses a low-noise permanent magnet motor stator structure, referring to... Figure 1 and Figure 2 The motor includes a yoke 1 arranged in a ring and a plurality of teeth 2. The number of teeth 2 depends on the size of the yoke 1. In this embodiment, there are twelve teeth 2. The twelve teeth 2 are arranged in a circular array with the axis of the yoke 1 as the center. A winding groove 3 for fixing the electric winding coil is formed between adjacent teeth 2 to prevent it from moving or being damaged during motor operation, thus ensuring the normal use of the motor to a certain extent.

[0028] Reference Figure 1 and Figure 2 A winding mark groove 4 is provided through the outer side of the yoke 1. The winding mark groove 4 penetrates the yoke 1 along the thickness direction of the yoke 1. The setting of the winding mark groove 4 provides positioning for the installation of the electric winding coil.

[0029] Reference Figure 1 and Figure 2 The tooth 2 is provided with a rectangular auxiliary groove 21 at the end away from the yoke 1. The auxiliary groove 21 extends along the thickness direction of the yoke 1 to penetrate the yoke 1. The setting of the auxiliary groove 21 not only effectively reduces the tooth cogging torque and torque pulsation, but also improves the electromagnetic noise. In addition, the addition of the auxiliary groove 21 can also improve the stator eccentricity efficiency and reduce energy consumption and cost.

[0030] Reference Figure 1 and Figure 2The tooth 2 includes a connecting part 22 and a tooth tip 23. The two ends of the connecting part 22 are integrally formed with the yoke 1 and the tooth tip 23, respectively. The tooth tip 23 includes two tooth shoes 24, which protrude circumferentially from both sides of the connecting part 22. The auxiliary groove 21 includes a first groove 211 and two second grooves 212. The first groove 211 is located on the same straight line as the connecting part 22. The second grooves 212 are located on the tooth shoes 24, and the two second grooves 212 are symmetrically arranged on both sides of the first groove 211. The angle between the tooth tip 23 and the second slot 212 is 7.2°. The inner radius of the tooth tip 23 on the side away from the connecting part 22 is 39.74 mm. The bottom radius of the auxiliary slot 21 is 40.24 mm. The depth of the auxiliary slot 21 is 0.5 mm and the width of the slot is 2 mm. The depth, width, position and number of the auxiliary slots 21 will affect the sine of the back electromotive force waveform, the magnitude of the cogging torque and the torque pulsation value of the motor. The above data are the optimal results obtained through experiments, which can greatly reduce the electromagnetic noise of the motor.

[0031] Reference Figure 1 and Figure 2 Multiple clearance grooves 11 are provided through the outer side of the yoke 1. The clearance grooves 11 penetrate the yoke 1 along the thickness direction of the yoke 1. In this embodiment, there are four clearance grooves 11. The four clearance grooves 11 are arranged in a circular array with the axis of the yoke 1 as the center line. By setting the clearance grooves 11, space is provided for other components inside the permanent magnet motor cover, and the space inside the motor housing is effectively utilized.

[0032] Reference Figure 1 and Figure 2 The end face of the yoke 1 is provided with a plurality of rivet points 12. In this embodiment, there are six rivet points 12, which are arranged in a circular array with the axis of the yoke 1 as the center. The rivet points 12 are used to fix the stator laminations, so that the stator laminations are not easy to move during the operation of the permanent magnet motor, ensuring the tightness of the stator lamination connection, thereby improving the stability and efficiency of the permanent magnet motor.

[0033] Reference Figure 1 and Figure 2 The end face of the yoke 1 is also provided with mounting through holes 13 for fixing the stator frame. In this embodiment, there are four mounting through holes 13, which are divided into two groups. The two groups of mounting through holes 13 are symmetrically arranged on both sides of the radial direction of the yoke 1. The stator frame is used to support and position the stator coil, ensuring that the stator coil is fixed in the proper position and that its position is accurate.

[0034] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A low noise permanent magnet motor stator structure, characterized by, The application relates to a yoke (1) and a plurality of tooth portions (2) arranged inside the yoke (1), the plurality of tooth portions (2) are arranged in a circumferential array with the axis of the yoke (1) as the center, a winding slot (3) is formed between adjacent tooth portions (2), an auxiliary slot (21) in a rectangular shape is arranged at the end of the tooth portion (2) away from the yoke (1), the auxiliary slot (21) extends along the thickness direction of the yoke (1), a winding mark slot (4) is arranged through the outer side of the yoke (1), a plurality of rivet points (12) for fixing stator lamination are arranged through the end face of the yoke (1), and the plurality of rivet points (12) are arranged in a circumferential array with the axis of the yoke (1) as the center.

2. The low noise permanent magnet motor stator structure of claim 1, wherein, The tooth portion (2) comprises a connecting portion (22) and a tooth top (23), two ends of the connecting portion (22) are connected with the yoke (1) and the tooth top (23) respectively, the tooth top (23) comprises two tooth shoes (24), the two tooth shoes (24) protrude to the circumferential two sides of the connecting portion (22) respectively, the auxiliary slot (21) comprises a first slot body (211) and two second slot bodies (212), the first slot body (211) is located on the same straight line with the connecting portion (22), and the second slot bodies (212) are located on the tooth shoes (24) and are symmetrically arranged on the two sides of the first slot body (211).

3. The low noise permanent magnet motor stator structure of claim 2, wherein, The angle between the first slot body (211) and the second slot body (212) is 7.2 degrees.

4. The low noise permanent magnet motor stator structure of claim 2, wherein, The inner circle radius of the side of the tooth top (23) away from the connecting portion (22) is 39.74 mm, the slot bottom radius of the auxiliary slot (21) is 40.24 mm, the slot depth of the auxiliary slot (21) is 0.5 mm, and the slot width is 2 mm.

5. The low noise permanent magnet motor stator structure of claim 1, wherein, A plurality of avoidance slots (11) are arranged through the outer side of the yoke (1) in a circumferential array with the axis of the yoke (1) as the center.

6. The low noise permanent magnet motor stator structure of claim 1, wherein, An installation through hole (13) for fixing a stator framework is arranged through the end face of the yoke (1).

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