CN218829298U

CN218829298U - Motor rotor

Info

Publication number: CN218829298U
Application number: CN202122021896.XU
Authority: CN
Inventors: 钱裕平; 徐安宁; 何兴城
Original assignee: ZHEJIANG HECHUAN TECHNOLOGY CO LTD
Current assignee: ZHEJIANG HECHUAN TECHNOLOGY CO LTD
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2023-04-07
Anticipated expiration: 2031-08-25

Abstract

The utility model discloses an electric motor rotor, including rotor core and install upper rotor magnet and the lower floor's rotor magnet in rotor core, the quantity of upper rotor magnet is the same with the quantity of lower floor's rotor magnet, whole upper rotor magnets are arranged according to upper magnet polygon on rotor core's upper strata, whole lower floor's rotor magnet is arranged according to lower floor's magnet polygon at rotor core's lower floor, upper magnet polygon is the same with lower floor's magnet polygon shape, and the center all is located rotor core's axis, the deviation angle is predetermine to have between upper magnet polygon and the lower floor's magnet polygon. In the motor rotor, a preset deviation angle is formed between an upper layer rotor magnet and a lower layer rotor magnet. The preset deviation angle can enable the harmonic magnetic fields of the two layers of rotor magnets to be distributed differently, so that the harmonic peak value generated by the harmonic magnetic fields is reduced, and the purpose of reducing the harmonic distortion rate of the motor is achieved.

Description

Motor rotor

Technical Field

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

Background

At present, in the rotating process of a motor rotor of a motor, a rotor magnet of the motor rotor generates a harmonic magnetic field, and the harmonic can cause the heat generation of the motor to be increased, so that the torque pulsation of the motor is caused, and the noise of the motor is increased. Harmonic waves are generated in the running process of the motor, and the running of the motor is influenced.

Take the chinese patent application of application number 201811057932.4 as an example, the rotor includes rotor magnet and rotor core, rotor core includes tip rotor punching and magnet rotor punching, a plurality of magnet holes that are used for holding rotor magnet that have the circumference interval distribution around the centre bore on the magnet rotor punching, the inside wall of tip rotor punching is used for backstop setting rotor magnet in the magnet hole, rotor magnet sets up in the magnet hole, rotor magnet's one end backstop is in the inside wall of tip rotor punching, rotor magnet's the other end backstop is in the inside wall of rotor end plate. As can be seen from fig. 1, the plurality of rotor magnets 2 are distributed at intervals along the axial direction, that is, each rotor magnet 2 is of an integral structure in the axial direction, and during the rotation process, the rotor magnets 2 generate a harmonic magnetic field, which further increases heat generation and noise.

Therefore, how to reduce the harmonic distortion rate of the motor is a technical problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an electric motor rotor can reduce the harmonic distortion rate of motor.

In order to achieve the above object, the utility model provides an electric motor rotor, include rotor core and install upper rotor magnet and lower floor's rotor magnet in the rotor core, the quantity of upper rotor magnet with the quantity of lower floor's rotor magnet is the same, and is whole upper rotor magnet is in rotor core's upper strata is arranged according to upper magnet polygon, and is whole lower floor's rotor magnet is in rotor core's lower floor is arranged according to lower floor's magnet polygon, upper magnet polygon and lower floor's magnet polygon shape the same, and the center all is located on rotor core's the axis, it predetermines the deviation angle to have between upper magnet polygon and the lower floor's magnet polygon.

Preferably, the rotor core comprises an upper rotor core for mounting the upper rotor magnets, the upper rotor core is provided with upper magnet insertion grooves extending from the upper end face of the rotor core to the middle of the rotor core along the axial direction of the rotor core, and all the upper magnet insertion grooves are arranged according to the upper magnet polygon.

Preferably, the rotor core includes a lower rotor core for installing the lower rotor magnet, the lower rotor core has a lower magnet insertion groove extending from a lower end face of the rotor core to the middle of the rotor core along the axial direction of the rotor core, and all the lower magnet insertion grooves are arranged according to the lower magnet polygon.

Preferably, the perpendicular bisector of any side of the upper-layer magnet polygon intersects with the axis of the rotor core, and the perpendicular bisector of any side of the lower-layer magnet polygon also intersects with the axis of the rotor core.

Preferably, the number of the upper layer magnet insertion grooves and the number of the lower layer magnet insertion grooves are 10.

Preferably, the preset deviation angle is 4 °.

The utility model provides an electric motor rotor, including rotor core and install upper rotor magnet and the lower floor's rotor magnet in rotor core, the quantity of upper rotor magnet is the same with the quantity of lower floor's rotor magnet, whole upper rotor magnets are arranged according to upper magnet polygon on rotor core's upper strata, whole lower floor's rotor magnet is arranged according to lower floor's magnet polygon at rotor core's lower floor, upper magnet polygon is the same with lower floor's magnet polygon shape, and the center all is located rotor core's axis, the deviation angle is predetermine to have between upper magnet polygon and the lower floor's magnet polygon.

In the motor rotor, upper rotor magnet and lower floor's rotor magnet distribute according to upper magnet polygon and lower floor's magnet polygon respectively, have the deviation angle of predetermineeing between upper magnet polygon and the lower floor's magnet polygon simultaneously. The preset deviation angle can lead the harmonic magnetic field distribution of the two layers of rotor magnets to be different, further reduce the harmonic peak value generated by the harmonic magnetic field and achieve the purpose of reducing the harmonic distortion rate of the motor.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is an exploded view of a motor rotor provided by the present invention;

fig. 2 is a side view of the rotor core of fig. 1.

Wherein the reference numerals in fig. 1 and 2 are:

upper rotor magnet 1, upper rotor core 2, lower rotor magnet 3, lower rotor core 4, upper magnet slot 21, lower magnet slot.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In order to make the technical field of the present invention better understand, the present invention will be described in detail with reference to the accompanying drawings and the detailed description.

Referring to fig. 1 and 2, fig. 1 is an exploded view of a motor rotor according to the present invention; fig. 2 is a side view of the rotor core of fig. 1.

The utility model provides an electric motor rotor, the structure is as shown in figure 1, including rotor core, upper rotor magnet 1 and lower floor's rotor magnet 3. The upper-layer rotor magnets 1 and the lower-layer rotor magnets 3 are both a plurality of rectangular plate-shaped magnets, and the number of the upper-layer rotor magnets 1 is the same as that of the lower-layer rotor magnets 3.

Rotor core divide into upper strata and lower floor along the axial, and upper rotor magnet 1 arranges according to upper magnet polygon on rotor core's upper strata, and lower floor's rotor magnet 3 arranges according to lower floor's magnet polygon at rotor core's lower floor, and upper rotor magnet 1 and the equal parallel rotor core's of lower floor's rotor magnet 3 axis.

The upper-layer magnet polygon and the lower-layer magnet polygon are regular polygons with the same shape, and the centers of the upper-layer magnet polygon and the lower-layer magnet polygon are located on the axis of the rotor core. The perpendicular bisector of any side of the upper layer magnet polygon intersects with the axis of the rotor core, and the perpendicular bisector of any side of the lower layer magnet polygon also intersects with the axis of the rotor core. A preset deviation angle is formed between the upper layer magnet polygon and the lower layer magnet polygon, and the projection of the lower layer magnet polygon on the rotor iron core axis normal plane can be coincided with the projection of the upper layer rotor magnet 1 on the plane after rotating the preset deviation angle. The preset deviation angle is smaller than the central angle corresponding to the polygonal side of the upper layer of magnet.

Alternatively, the rotor core includes an upper layer rotor core 2, and the upper layer rotor core 2 has an upper layer magnet insertion slot 21. As shown in fig. 1, there are a plurality of upper-layer magnet insertion slots 21, and all the upper-layer magnet insertion slots 21 extend downward from the upper end surface of the upper-layer rotor core 2 to the lower portion of the upper-layer rotor core 2. The upper layer magnet insertion slots 21 are arranged in the circumferential direction of the upper layer rotor core 2 according to the upper layer magnet polygon. And the upper rotor magnet 1 is inserted into the upper magnet insertion groove 21, so that the upper rotor iron core 2 is connected with the upper rotor magnet 1.

Optionally, the rotor core further includes a lower rotor core 4, and the lower rotor core 4 has a lower magnet insertion slot. As shown in fig. 1, there are a plurality of lower-stage magnet insertion slots, and all of the lower-stage magnet insertion slots extend downward from the lower end surface of the lower-stage rotor core 4 to the lower portion of the lower-stage rotor core 4. The lower-layer magnet insertion grooves are arranged in the circumferential direction of the lower-layer rotor core 4 according to the lower-layer magnet polygon. And the lower rotor magnet 3 is inserted into the lower magnet insertion groove, so that the lower rotor iron core 4 is connected with the lower rotor magnet 3.

Optionally, upper rotor core 2 and lower floor's rotor core 4 all can be formed through high-speed punch punching rotor silicon steel sheet, and after 4 punching presses of lower floor's rotor core were accomplished, rotate the mould and predetermine the deviation angle, carry out upper rotor core 2's processing. The upper rotor core 2 and the lower rotor core 4 can be fixedly connected by welding and the like. The specific processing and stamping method of the rotor core can refer to the prior art, and is not described herein again. Of course, the user may also process the rotor core in other manners as needed, which is not limited herein.

Optionally, in an embodiment of the present application, the number of the upper layer magnet slots 21 and the lower layer magnet slots is 10. Accordingly, the number of the upper rotor magnets 1 and the lower rotor magnets 3 is 10. The upper layer magnet polygon and the lower layer magnet polygon are regular decagon, and the preset deviation angle is 4 degrees.

In this embodiment, the upper rotor magnet 1 and the lower rotor magnet 3 have a predetermined offset angle therebetween. Therefore, the magnetic field distribution of the upper layer and the lower layer of the motor rotor is different, the harmonic distortion rate of the motor can be reduced, and the purposes of reducing the temperature rise of the motor, reducing the iron loss and reducing the noise of the motor are achieved. Meanwhile, the upper-layer rotor magnet 1 and the lower-layer rotor magnet 3 are connected with the upper-layer magnet insertion groove 21 and the lower-layer magnet insertion groove in an insertion mode, the motor rotor is of an embedded structure, the assembling difficulty of the motor rotor can be reduced, and meanwhile, the rotor core is manufactured in a punch forming mode, so that the manufacturing efficiency of the motor rotor is improved, and the manufacturing cost is reduced.

It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

It is right above that the utility model provides an electric motor rotor has carried out detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. The utility model provides an electric motor rotor, its characterized in that includes rotor core and installs upper rotor magnet (1) and lower floor's rotor magnet (3) in the rotor core, the quantity of upper rotor magnet (1) with the quantity of lower floor's rotor magnet (3) is the same, all upper rotor magnet (1) is in rotor core's upper strata is arranged according to upper magnet polygon, and is whole lower floor's rotor magnet (3) are in rotor core's lower floor is arranged according to lower floor's magnet polygon, upper magnet polygon with lower floor's magnet polygon shape is the same, and the center all is located on rotor core's the axis, upper magnet polygon with the deviation angle is predetermine to have between the lower floor's magnet polygon.

2. An electric machine rotor according to claim 1, characterized in that the rotor core comprises an upper layer rotor core (2) for mounting the upper layer rotor magnets (1), the upper layer rotor core (2) having upper layer magnet insertion slots (21) extending from an upper end face of the rotor core to a middle portion of the rotor core in an axial direction of the rotor core, all the upper layer magnet insertion slots (21) being arranged in a polygon shape of the upper layer magnets.

3. An electric machine rotor according to claim 2, characterized in that the rotor core comprises a lower layer rotor core (4) for mounting the lower layer rotor magnets (3), the lower layer rotor core (4) having lower layer magnet slots extending from the lower end face of the rotor core to the middle of the rotor core in the axial direction of the rotor core, all the lower layer magnet slots being arranged in a polygon of the lower layer magnets.

4. The electric machine rotor of claim 2, wherein the midperpendicular of either side of the upper level magnet polygon intersects the axis of the rotor core and the midperpendicular of either side of the lower level magnet polygon also intersects the axis of the rotor core.

5. An electric machine rotor, according to claim 3, characterised in that the number of upper layer magnet slots (21) and lower layer magnet slots is 10.

6. An electric machine rotor, according to any of claims 1-5, characterized in that said preset deviation angle is 4 °.