CN218920070U - A permanent magnet motor and electric drive system - Google Patents

Abstract

The utility model discloses a permanent magnet motor and an electric drive system. Wherein, the permanent magnet motor includes a stator and a rotor; the stator includes a stator core segment, and a plurality of axial stator teeth are arranged on the inner circular surface of the stator core segment, and a stator slot is formed between two adjacent stator teeth, at least Auxiliary slots are opened on the top ends of some stator teeth. The permanent magnet motor has the advantages of low motor vibration noise and high NVH quality.

Description

A permanent magnet motor and electric drive system

technical field

The utility model belongs to the technical field of motor stators, in particular to a permanent magnet motor and an electric drive system.

Background technique

When the permanent magnet synchronous motor is working, the interaction between the armature magnetic field and the rotor magnetic field generates electromagnetic torque, and then converts electrical energy into mechanical energy to achieve power output. Among them, the armature magnetic field is generated by the current on the stator, and the rotor magnetic field is provided by the rotor permanent magnet. The armature magnetic field and the rotor magnetic field will synthesize the air gap magnetic field in the air gap of the motor. Due to the influence of iron core magnetic saturation and other factors, the air gap magnetic field is not a standard sine wave, and there will be harmonic components, and the harmonic components will Torque fluctuations and obvious radial electromagnetic force waves on certain orders cause the motor to generate noise and vibration, thereby reducing the NVH (Noise, Vibration, Harshness) quality of the motor.

Utility model content

In view of the above problems, the utility model discloses a permanent magnet motor and an electric drive system to overcome the above problems or at least partly solve the above problems.

In order to achieve the above object, the utility model adopts the following technical solutions:

The utility model provides a permanent magnet motor on the one hand, and the permanent magnet motor includes a stator and a rotor;

The stator includes a stator core segment, a plurality of axial stator teeth are arranged on the inner surface of the stator core segment, a stator slot is formed between two adjacent stator teeth, and at least part of the stator teeth An auxiliary groove is provided on the top.

Further, the rotor includes a plurality of rotor core segments that are mutually staggered by a first preset angle, the number of the stator core segments is multiple, and each stator core segment corresponds to each rotor core segment set up.

Further, the positions and/or numbers of the auxiliary slots on the stator core segments corresponding to different rotor core segments are different.

Further, the shape, position and quantity of the auxiliary slots on each of the stator core segments are consistent, and each of the stator core segments are arranged with a second preset angle staggered from each other.

Further, the auxiliary slots on the stator core segments are arranged periodically.

Further, several adjacent stator teeth without the auxiliary slots at the tops form a group, several adjacent stator teeth with the auxiliary slots at the tops form a group, and a group of stator teeth without the auxiliary slots at the tops forms a group. The stator teeth of the auxiliary slots and a set of stator teeth with the auxiliary slots opened at their tops are arranged alternately and at intervals.

Further, the auxiliary slot penetrates through the stator core segment in the axial direction.

Further, the radial cross-sectional shape of the auxiliary groove is an axisymmetric figure, and the auxiliary groove is arranged at the middle position of the top end of the stator tooth, so that the axis of symmetry of the axisymmetric figure is symmetrical to that of the stator tooth. axis coincident.

Further, the radial section of the auxiliary groove is arc-shaped, U-shaped or V-shaped.

Another aspect of the present invention provides an electric drive system, which includes the above-mentioned permanent magnet motor.

Advantage and beneficial effect of the present utility model are:

In the permanent magnet motor of the present utility model, by setting up auxiliary slots at the tops of at least part of the stator teeth, the torque fluctuations and radial electromagnetic force waves jointly generated by the rotor iron core section and the stator iron core section can be suppressed at a lower level. level, thereby reducing the overall torque fluctuation and radial electromagnetic force of the motor, which can effectively suppress the generation of motor vibration and noise, and improve the NVH quality of the motor.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiment. The drawings are only for the purpose of illustrating preferred embodiments, and are not considered to limit the present invention. Also throughout the drawings, the same reference numerals are used to designate the same parts. In the attached picture:

Fig. 1 is a partial structural diagram of the stator core section in an embodiment of the utility model;

Fig. 2 is a partial structural diagram of the rotor core section in an embodiment of the present invention;

3 to 5 are radial cross-sectional views of three different stator core segments;

Fig. 6 is a partial structural diagram of the stator core segment in Fig. 3;

Fig. 7 is a radial cross-sectional view of the stator core segment in another embodiment of the present invention;

Fig. 8 is a radial cross-sectional view of a stator core segment in another embodiment of the present invention.

In the figure: 1, stator core segment; 2, stator teeth; 3, stator slot; 4, auxiliary slot; 5, rotor core segment; 6, through slot.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with specific embodiments of the utility model and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

The technical solutions provided by the various embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

One embodiment of the utility model discloses a permanent magnet motor, which includes a stator and a rotor.

Specifically, as shown in Fig. 1, Fig. 3 to Fig. 6, the stator includes a stator core segment 1, and a plurality of axial stator teeth 2 are arranged on the inner circular surface of the stator core segment 1, and the stator teeth 2 are used for winding For the coil winding, a stator slot 3 is formed between two adjacent stator teeth 2 , so that the coil winding can be accommodated in the stator slot 3 . Wherein, auxiliary slots 4 are opened on the top ends of some stator teeth 2, and the auxiliary slots 4 open toward the rotor. Of course, auxiliary slots 4 may also be formed on the top ends of all the stator teeth 2 .

To sum up, in the permanent magnet motor of this embodiment, by opening auxiliary slots at the tops of at least part of the stator teeth, the air gap between the stator and the rotor is increased, thereby reducing the radial electromagnetic force on the stator teeth, and the rotor can be The torque fluctuation and radial electromagnetic force wave jointly generated by the iron core section and the stator core section are suppressed at a low level, thereby reducing the overall torque fluctuation and radial electromagnetic force of the motor, and effectively suppressing the vibration and noise of the motor The NVH quality of the motor is improved; moreover, the structural design of the auxiliary slot can reduce the mass of the stator without affecting the strength of the stator, thereby realizing the lightweight design of the motor.

In this embodiment, as shown in Figure 2, the rotor includes three rotor core segments 5 that are mutually staggered by a first preset angle, namely the first rotor core segment 5-1, the second rotor core segment 5- 2 and the third rotor core section 5-3, the rotor core section 5 can reduce the cogging effect caused by the stator slot 3 by staggering the structural design of the first preset angle, and make the rotor rotate more smoothly; in addition, the three The outer surface of the rotor core section 5 is provided with an axial through slot 6, the design of the slot 6 can effectively disperse the harmonic energy, thereby optimizing the air gap magnetic density waveform, and further suppressing the vibration noise of the motor . Moreover, as shown in FIG. 1, the number of stator core segments 1 is also three, which are respectively the first stator core segment 1-1, the second stator core segment 1-2 and the third stator core segment 1 -3, three stator core segments 1 and three rotor core segments 5 are set correspondingly. Wherein, the first preset angle is determined according to motor simulation. Of course, other numbers of rotor core segments 5 and stator core segments 1 can also be used.

In addition, the locations and/or numbers of the auxiliary slots on the stator core segments corresponding to different rotor core segments are different. Since the rotor poles face different angles in different rotor core segments, there will be differences in the synthesized air gap flux density waveforms on different rotor core segments, which requires the position and/or number of auxiliary slots to be adjusted according to their The rotor core segment corresponding to the stator core segment varies, which can effectively reduce the air-gap flux density harmonic content on each rotor core segment and achieve the purpose of suppressing motor vibration and noise.

Further, the shape, position and quantity of the auxiliary slots on each stator core segment are consistent, and each stator core segment is set at a second preset angle staggered from each other, so that, in the relative position, the stator core segments can be The structure remains differentiated, ie the relative position of the auxiliary slots on the different stator core segments differs. Wherein, the second preset angle is determined according to motor simulation. The stator core segment in this embodiment can be processed and manufactured by using the same set of molds, thereby reducing the manufacturing cost of the permanent magnet motor.

Moreover, as shown in Fig. 1, Fig. 3 to Fig. 6, the auxiliary slot 4 runs through the stator core segment 1 in the axial direction. By adopting the axially penetrating structural design, not only the auxiliary slot 4 is easier to process, but also it is convenient to control the auxiliary slot. The shape and size of 4 make the consistency between the auxiliary slots 4 on each stator core segment 1 better. Of course, the auxiliary slot 4 can also be opened at the center of the top end of the stator tooth 2, for example, the auxiliary slot is a circular slot opened on the top end of the stator tooth.

In this embodiment, the auxiliary grooves on the stator core segment are periodically arranged, which can make the stator core segment more symmetrical and facilitate the production of auxiliary grooves on the stator core segment; and, because the stator core The coil winding on the segment is wound periodically, and the electromagnetic force formed by the coil winding is also periodic. By periodically arranging the auxiliary slots on the stator core segment, the effect of suppressing the vibration and noise of the motor can be better.

Further, several adjacent stator teeth without auxiliary slots at the top form a group, several adjacent stator teeth with auxiliary slots at the top form a group, a group of stator teeth without auxiliary slots at the top and a group The stator teeth with auxiliary slots opened at the top are alternately arranged at intervals. Specifically, as shown in Figures 3 to 6, two adjacent stator teeth 2 without auxiliary slots 4 at the top form a group, one stator tooth 2 with auxiliary slots 4 at the top forms a group, and two adjacent top ends without auxiliary slots 4 form a group. The stator teeth 2 with the auxiliary slots 4 and the stator teeth 2 with the auxiliary slots 4 at the top are alternately arranged at intervals. In other embodiments, as shown in FIG. 7 , two adjacent stator teeth 2 without auxiliary slots 4 at their tops may form a group, and four adjacent stator teeth 2 with auxiliary slots 4 at their tops may form a group.

Of course, in other embodiments, the auxiliary slots can also be arranged in a more complex periodic manner. For example, as shown in FIG. 4 stator teeth 2, and then two stator teeth 2 without auxiliary slots 4 at the top, two stator teeth 2 with auxiliary slots 4 at the top appear, which are arranged periodically in sequence.

In addition, the stator core segment is formed by laminating the stator punching sheets, which can simplify the manufacturing process; moreover, the stator punching sheet is formed by stamping, so that the consistency of the stator core segment can be improved.

In this embodiment, the radial cross-sectional shape of the auxiliary groove is an axisymmetric figure, and the auxiliary groove is arranged at the middle position of the top of the stator teeth, so that the symmetry axis of the axisymmetric figure coincides with the symmetry axis of the stator teeth. In this way, the overall symmetry of the stator core segment can be ensured, and the effect of suppressing the vibration and noise of the motor is better.

Wherein, as shown in Fig. 1, Fig. 3 to Fig. 6, the radial section of the auxiliary groove 4 is arc-shaped, since the air resistance of the arc-shape is small, the resistance generated when the motor starts can be reduced. Certainly, the radial section of the auxiliary groove 4 may also be U-shaped or V-shaped, or other shapes.

Another embodiment of the present invention discloses an electric drive system, which includes the permanent magnet motor in the above embodiments, and has the advantages of low vibration noise and high NVH quality.

The above descriptions are only specific implementations of the present utility model. Under the above teaching of the present utility model, those skilled in the art can make other improvements or deformations on the basis of the above embodiments. Those skilled in the art should understand that the above specific description is only to better explain the purpose of the utility model, and the protection scope of the utility model should be based on the protection scope of the claims.

Claims (10)

1. A permanent magnet motor, characterized in that the permanent magnet motor comprises a stator and a rotor;

the stator comprises a stator core section, a plurality of axial stator teeth are arranged on the inner circular surface of the stator core section, a stator groove is formed between two adjacent stator teeth, and an auxiliary groove is formed in the top end of at least part of the stator teeth.

2. The permanent magnet machine of claim 1 wherein the rotor includes a plurality of rotor core segments offset from one another by a first predetermined angle, the number of stator core segments being a plurality, the stator core segments and the rotor core segments being disposed in correspondence.

3. A permanent magnet machine according to claim 2, wherein the positions and/or numbers of auxiliary slots on the stator core segments corresponding to different rotor core segments are different.

4. The permanent magnet machine of claim 2 wherein the auxiliary slots on each of the stator core segments are uniform in shape, location and number and each of the stator core segments are offset from each other by a second predetermined angle.

5. The permanent magnet machine of claim 1 wherein the auxiliary slots on the stator core segments are arranged periodically.

6. The permanent magnet motor of claim 5 wherein adjacent ones of the stator teeth on which the auxiliary slots are not formed are in a set, adjacent ones of the stator teeth on which the auxiliary slots are formed are in a set, the stator teeth on which the auxiliary slots are not formed on a set of the top ends being alternately spaced apart from the stator teeth on which the auxiliary slots are formed on a set of the top ends.

7. A permanent magnet machine according to any one of claims 1-6, wherein the auxiliary slots extend axially through the stator core segment.

8. The permanent magnet motor according to any one of claims 1 to 6, wherein the radial cross-sectional shape of the auxiliary groove is an axisymmetric pattern, and the auxiliary groove is provided at an intermediate position of the tip end of the stator tooth such that the symmetry axis of the axisymmetric pattern coincides with the symmetry axis of the stator tooth.

9. The permanent magnet machine of claim 8 wherein the radial cross-section of the auxiliary slot is circular arc, U-shaped or V-shaped.

10. An electric drive system, characterized in that it comprises a permanent magnet motor according to any one of claims 1-9.

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