CN219227302U

CN219227302U - Permanent magnet synchronous motor and rotor thereof

Info

Publication number: CN219227302U
Application number: CN202223396942.5U
Authority: CN
Inventors: 陈益辉; 林福; 戴欣; 蒋大千; 王龙
Original assignee: United Automotive Electronic Systems Co Ltd
Current assignee: United Automotive Electronic Systems Co Ltd
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-06-20
Anticipated expiration: 2032-12-16

Abstract

The application discloses PMSM and rotor thereof, wherein, PMSM rotor is including being the rotor core that the ring set up, rotor core includes a plurality of magnetic poles, set up flutedly on the circumference lateral wall of magnetic pole, the recess includes first harmonic groove, the type in first harmonic groove is one of class harmonic groove, class II harmonic groove and three class harmonic groove. The permanent magnet synchronous motor comprises a stator, a rotor and a rotating shaft, wherein the rotor is the permanent magnet synchronous motor rotor. According to the scheme, the effect of optimizing the magnetic circuit can be achieved, and finally the purpose of inhibiting torque fluctuation of the permanent magnet synchronous motor is achieved.

Description

Permanent magnet synchronous motor and rotor thereof

Technical Field

The application relates to the technical field of permanent magnet synchronous motors, in particular to a permanent magnet synchronous motor and a rotor thereof.

Background

Permanent magnet synchronous motors have been widely used in various fields because of their advantages of simple structure, small size, high efficiency, high power factor, and the like. Generally, a permanent magnet synchronous motor mainly comprises a rotor, an end cover, a stator, and other components, and the stator structure is very similar to that of a general induction motor, and the rotor structure is different from an asynchronous motor in that high-quality permanent magnet poles are placed on the rotor, and the permanent magnet synchronous motor is generally classified into a surface type rotor structure and a built-in type rotor structure according to the positions of placing permanent magnets on the rotor.

Because of the non-sinusoidal magnetic field of the permanent magnet synchronous motor and the stator cogging effect, the rotor can generate larger torque fluctuation when rotating along the circumferential direction. Torque ripple and radial forces can affect the torque control effect of the motor, causing motor noise, vibration problems. In general, the method of optimizing radial force to attenuate torque ripple effects is stator chute or rotor chute stage. However, the stator and rotor ramps add complexity to the manufacturing process, increase tooling costs, and at the same time, detract from motor capability.

Disclosure of Invention

The application provides a permanent magnet synchronous motor and a rotor thereof, which can realize the effect of restraining torque fluctuation.

In a first aspect, an embodiment of the present application provides a permanent magnet synchronous motor rotor, which adopts the following technical scheme:

the utility model provides a permanent magnet synchronous motor rotor, includes the rotor core that is the setting of ring shape, rotor core includes a plurality of magnetic poles, set up flutedly on the circumference lateral wall of magnetic pole, the recess includes first harmonic groove, the type in first harmonic groove is one of class one harmonic groove, class II harmonic groove and three class harmonic groove.

In some embodiments, the groove further comprises a second harmonic groove of a type different from the first harmonic groove, the second harmonic groove being one of a first harmonic groove, a second harmonic groove, and a third harmonic groove.

In some embodiments, the groove further comprises a third harmonic groove of a type that is one of a first harmonic groove, a second harmonic groove, and a third harmonic groove, the third harmonic groove being of a type that is different from the first and second harmonic grooves.

In some embodiments, the harmonic slots are harmonic slots with an included angle of 3.8-7 degrees between a connecting line of the midpoint of the harmonic slot and the center of the rotor core and the central axis of the magnetic pole.

In some embodiments, the second harmonic slot is a harmonic slot with an included angle of 8-12.8 degrees between a connecting line of the midpoint of the harmonic slot and the center of the rotor core and the central axis of the magnetic pole.

In some embodiments, the three types of harmonic slots are harmonic slots with an included angle of 13.8-18.8 degrees between a connecting line of the midpoint of the harmonic slot and the center of the rotor core and the central axis of the magnetic pole.

In some embodiments, the groove depth of the groove is no greater than 4mm.

In some embodiments, each pole of the rotor core is provided with the same recess.

In a second aspect, an embodiment of the present application provides a permanent magnet synchronous motor, including a stator, a rotor and a rotating shaft, where the rotor is a rotor of the permanent magnet synchronous motor according to the first aspect.

The technical scheme of the application at least comprises the following advantages:

1. by forming the groove comprising the first harmonic groove on the circumferential side wall of the rotor core, the effect of optimizing the magnetic circuit can be achieved, and finally the purpose of inhibiting torque fluctuation of the permanent magnet synchronous motor is achieved.

Drawings

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

Fig. 1 is a schematic structural diagram of a rotor of a permanent magnet synchronous motor according to an exemplary embodiment of the present application;

FIG. 2 is a schematic diagram of a structure for embodying included angles a, b, c provided in an exemplary embodiment of the present application;

fig. 3 is a graph comparing load torque waveforms of a permanent magnet synchronous motor before and after slotting according to an exemplary embodiment of the present application.

Reference numerals illustrate: 1. a rotor core; 11. a permanent magnet; 2. a first harmonic slot; 3. a second harmonic slot; 4. a third harmonic slot.

Detailed Description

The following description of the embodiments of the present application will be made apparent and complete in conjunction with the accompanying drawings, in which embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not collide with each other.

The application provides a permanent magnet synchronous motor rotor, referring to fig. 1, the permanent magnet synchronous motor rotor includes a rotor core 1 that is annular setting. The rotor core 1 includes a plurality of magnetic poles, and each of the magnetic poles is fitted with a permanent magnet 11. In the present application, the arrangement of the permanent magnets 11 includes, but is not limited to, a double-layered V-shaped structure, a single-layered V-shaped structure, a triple-layered V-shaped structure, a double-layered U-shaped structure, and the like.

In order to achieve the effect of optimizing the magnetic circuit, grooves are formed in the circumferential side wall of the rotor core 1.

Further, the depth of the groove is not more than 4mm.

Further, the types of the grooves comprise a first harmonic groove, a second harmonic groove and a third harmonic groove. Wherein, one type of harmonic slot refers to a harmonic slot with an included angle (shown as a in fig. 2) between the midpoint of the harmonic slot and the center axis of the magnetic pole where the midpoint of the rotor core 1 is located being 3.8-7 degrees, the second type of harmonic slot refers to a harmonic slot with an included angle (shown as b in fig. 2) between the midpoint of the harmonic slot and the center axis of the magnetic pole where the midpoint of the rotor core 1 is located being 8-12.8 degrees, and the third type of harmonic slot refers to a harmonic slot with an included angle (shown as c in fig. 2) between the midpoint of the harmonic slot and the center axis of the magnetic pole where the midpoint of the rotor core 1 is located being 13.8-18.8 degrees.

Taking one magnetic pole of the rotor core 1 as an example, referring to fig. 1, a first harmonic slot 2, a second harmonic slot 3 and a third harmonic slot 4 are respectively formed on a circumferential side wall of the rotor core 1, and the first harmonic slot 2, the second harmonic slot 3 and the third harmonic slot 4 are respectively a first harmonic slot, a second harmonic slot and a third harmonic slot in sequence. Meanwhile, in the present embodiment, the first harmonic slot 2, the second harmonic slot 3, and the third harmonic slot 4 are provided symmetrically with respect to the central axis of the magnetic pole where they are located, respectively.

Referring to fig. 3, there is shown a comparison of load torque waveforms of the permanent magnet synchronous motor before and after slotting, wherein the load torque waveform before slotting has larger fluctuation and the load torque waveform after three slots are formed has smaller fluctuation. It was found that by providing grooves in the circumferential side wall of the rotor core 1, torque ripple of the permanent magnet synchronous motor was improved.

In other embodiments, only one of the three types of harmonic slots may be provided on the circumferential side wall of the rotor core 1, or only two of the three types of harmonic slots may be provided, and the number of each type of harmonic slot is not particularly limited.

Further, each magnetic pole of the rotor core 1 is provided with the same grooves, namely, for each magnetic pole, the type of the grooves, the relative positions, the sizes and the numbers of the grooves on the magnetic pole are the same.

The embodiment of the application also discloses a permanent magnet synchronous motor, which comprises a stator, a rotor and a rotating shaft, wherein the rotor is the permanent magnet synchronous motor rotor disclosed in the embodiment.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While nevertheless, obvious variations or modifications may be made to the embodiments described herein without departing from the scope of the utility model.

Claims

1. The utility model provides a permanent magnet synchronous motor rotor, is including being rotor core (1) that ring set up, rotor core (1) include a plurality of magnetic poles, its characterized in that, set up flutedly on the circumference lateral wall of magnetic pole, the recess includes first harmonic groove (2), the type of first harmonic groove (2) is one of class one harmonic groove, class two harmonic grooves and class three harmonic groove.

2. The permanent magnet synchronous motor rotor according to claim 1, characterized in that the groove further comprises a second harmonic slot (3), the type of the second harmonic slot (3) being one of a class of harmonic slots, a class of harmonic slots and a class of three harmonic slots, the type of the second harmonic slot (3) being different from the first harmonic slot (2).

3. The permanent magnet synchronous motor rotor according to claim 2, characterized in that the groove further comprises a third harmonic groove (4), the type of the third harmonic groove (4) being one of a class of harmonic grooves, a class of harmonic grooves and a class of three harmonic grooves, the type of the third harmonic groove (4) being different from the first harmonic groove (2) and the second harmonic groove (3).

4. The rotor of a permanent magnet synchronous motor according to claim 1, wherein the harmonic grooves are characterized in that the included angle between the connecting line of the midpoint of the harmonic grooves and the center of the rotor core (1) and the central axis of the magnetic pole is 3.8-7 degrees.

5. The rotor of claim 4, wherein the second harmonic slot is a harmonic slot with an included angle of 8-12.8 degrees between a connecting line of a midpoint of the harmonic slot and a center of a circle of the rotor core (1) and a central axis of a magnetic pole.

6. The rotor of claim 5, wherein the three types of harmonic slots are harmonic slots with an included angle of 13.8-18.8 degrees between a connecting line of a midpoint of the harmonic slot and a center of a circle of the rotor core (1) and a central axis of a magnetic pole.

7. The permanent magnet synchronous motor rotor according to claim 1, wherein the groove depth of the groove is not more than 4mm.

8. Permanent magnet synchronous motor rotor according to claim 1, characterized in that each pole of the rotor core (1) is provided with identical grooves.

9. A permanent magnet synchronous motor, characterized in that the permanent magnet synchronous motor comprises a stator, a rotor and a rotating shaft, wherein the rotor is a permanent magnet synchronous motor rotor according to any one of claims 1-8.