CN214412440U

CN214412440U - High-power-density permanent magnet rotor

Info

Publication number: CN214412440U
Application number: CN202120350908.0U
Authority: CN
Inventors: 邱琦勇
Original assignee: Taizhou Yizhou Agricultural Machinery Co ltd
Current assignee: Taizhou Yizhou Agricultural Machinery Co ltd
Priority date: 2021-02-07
Filing date: 2021-02-07
Publication date: 2021-10-15
Anticipated expiration: 2031-02-07

Abstract

The utility model provides a high power density's permanent magnet rotor belongs to motor technical field. The permanent magnet rotor comprises a rotor core, wherein a plurality of accommodating grooves are formed in the end face of the rotor core along the circumferential direction of the rotor core; each accommodating groove is embedded with a permanent magnet, the accommodating grooves are in a straight shape, and the length direction of each accommodating groove is vertical to the radius direction of the rotor; the rotor core is also provided with magnetic conduction holes with the same number as the holding tank, and the centers of the magnetic conduction holes are positioned on a connecting line between the center of the holding tank and the rotating shaft of the rotor core. The permanent magnet rotor can effectively improve the power density of the motor.

Description

High-power-density permanent magnet rotor

Technical Field

The utility model belongs to the technical field of the motor, a rotor, especially a high power density's permanent magnet rotor is related to.

Background

In the prior art, an embedded permanent magnet motor has a plurality of slits formed in a rotor core, and permanent magnets are embedded in the slits. The permanent magnets and the slits are arranged along the circumferential direction, and the adjacent permanent magnets are distributed with different magnetic poles on the same side. Gaps are formed between two ends of the permanent magnet and two ends of the slit, and glue is filled in the gaps to fix the permanent magnet.

For example, patent documents published by the national intellectual property office: a rotor of an in-line permanent magnet motor [ application No. CN 201320336256.0; public notice number CN203339828U, it includes rotor core 2 with inlay permanent magnet 1 in rotor core 2, permanent magnet 1 with there is casting glue 3 in the space between rotor core 2, its characterized in that: a glue-pouring circular tube 4 with a smooth inner surface is inserted into the gap, and a plurality of through holes 5 are formed in the side wall of the glue-pouring circular tube 4. The magnetic field lines of the permanent magnets in the rotor of the embedded permanent magnet motor are relatively dispersed, so that the power density of the rotor is relatively low.

Disclosure of Invention

The utility model aims at having above-mentioned problem to current technique, provided a high power density's permanent magnet rotor, the technical problem that it will be solved makes permanent magnet rotor's power density obtain improving.

The purpose of the utility model can be realized by the following technical proposal: a permanent magnet rotor with high power density comprises a rotor core, wherein a plurality of accommodating grooves are formed in the end face of the rotor core along the circumferential direction of the rotor core; each accommodating groove is embedded with a permanent magnet, and the permanent magnets are characterized in that the accommodating grooves are in a straight shape, and the length direction of the accommodating grooves is perpendicular to the radius direction of the rotor; the rotor core is further provided with magnetic conduction holes, the number of the magnetic conduction holes is equal to that of the accommodating grooves, and the centers of the magnetic conduction holes are located on a connecting line between the centers of the accommodating grooves and the rotating shaft of the rotor core.

The principle of the utility model is as follows: magnetic lines of force of the permanent magnets are guided to the end parts of the permanent magnets through the magnetic conduction holes and are gathered between two adjacent permanent magnets, so that the density of the magnetic lines of force of air gaps between the adjacent permanent magnets is improved, the output torque of the motor is further improved, and the power density of the motor is further improved.

In the above permanent magnet rotor with high power density, the magnetic conduction holes are circular holes.

In the above permanent magnet rotor with high power density, the magnetic conductive hole is a square hole, and one corner of the square hole is opposite to the middle part of the accommodating groove.

In the permanent magnet rotor with high power density, the corners of the square hole opposite to the middle of the accommodating groove are rounded corners.

In the above-mentioned permanent magnet rotor with high power density, the magnetic conduction hole is a triangular hole, and one corner of the triangular hole is right opposite to the middle part of the accommodating groove.

In the permanent magnet rotor with high power density, the angle of the triangular hole opposite to the middle part of the accommodating groove is a fillet.

In the above permanent magnet rotor with high power density, the triangular holes are isosceles triangular holes.

In the high-power-density permanent magnet rotor, one side of the accommodating groove is provided with a limiting step, and the permanent magnet is clamped in the limiting step.

Compared with the prior art, the utility model has the advantages of it is following:

1. the magnetic line density of the permanent magnet air gap is improved through the magnetic conduction holes; therefore, the rotor can effectively improve the power density of the motor; 2, the weight of the rotor core is reduced by arranging the magnetic conduction holes, and the number of permanent magnets can be reduced and the material cost is reduced due to the improvement of the power density; 3. the linear holding tank is adopted to match with the permanent magnet, so that the manufacturing difficulty of the permanent magnet is reduced, the process is simplified, and the manufacturing cost is reduced.

Drawings

Fig. 1 is a schematic structural diagram of the permanent magnet rotor of the present invention.

Fig. 2 is a schematic view of a perspective view of the rotor core according to the present invention.

Fig. 3 is a magnetic force line distribution diagram when the permanent magnet rotor of the present invention is applied.

In the figure, 1, a rotor core; 2. accommodating grooves; 3. a permanent magnet; 4. a limiting step; 5. a magnetic conduction hole; 6. an air gap.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

The first embodiment is as follows:

as shown in fig. 1 and 2, the high power density permanent magnet rotor includes a rotor core 1, a plurality of accommodating grooves 2 in a shape of a straight line are formed in the end face of the rotor core 1 along the circumferential direction of the rotor core 1, and a permanent magnet 3 is embedded in each accommodating groove 2. Specific speaking, one side of every holding tank 2 all is equipped with spacing step 4, and this spacing step 4 can be holding tank 2 and be close to rotor core 1 center one side or be close to one side of rotor core 1 periphery, and the preferred adoption in this embodiment sets up spacing step 4 in the one side that is close to rotor core 1 center, and 3 cards of permanent magnet are in this spacing step 4.

The length direction of the accommodating groove 2 is vertical to the radius direction of the rotor; the rotor core 1 is further provided with magnetic conduction holes 5 with the same number as the holding tank 2, and the centers of the magnetic conduction holes 5 are located on a connecting line between the center of the holding tank 2 and the rotating shaft of the rotor core 1.

The magnetic conduction hole 5 is an isosceles triangular hole, one corner of the isosceles triangular hole is right opposite to the middle part of the accommodating groove 2, and the corner is a fillet. As shown in fig. 3, under the guiding action of the hole wall of the triangular hole on the magnetic force lines of the permanent magnet 3, the magnetic force lines tend to and gather in the end air gap 6 of the permanent magnet 3, so that the magnetic force line density of the air gap 6 is improved, and meanwhile, the magnetic force lines are distributed more stably and are not easily interfered.

Example two:

the difference between the present embodiment and the first embodiment is: the magnetic conduction hole 5 is a circular hole, and the axis of the circular hole is positioned on the connecting line of the center of the accommodating groove 2 and the axis of the rotor core 1.

Example three:

the difference between the present embodiment and the first embodiment is: magnetic conduction hole 5 is the quad slit, and a corner of quad slit is just to holding tank 2's middle part, and this corner is the fillet.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A permanent magnet rotor with high power density comprises a rotor core (1), wherein a plurality of accommodating grooves (2) are formed in the end face of the rotor core (1) along the circumferential direction of the rotor core (1); each accommodating groove (2) is embedded with a permanent magnet (3), and the permanent magnet type rotor is characterized in that the accommodating grooves (2) are in a straight line shape, and the length direction of the accommodating grooves (2) is vertical to the radius direction of the rotor; the rotor core (1) is further provided with magnetic conduction holes (5) with the same number as the accommodating grooves (2), and the centers of the magnetic conduction holes (5) are located on a connecting line between the centers of the accommodating grooves (2) and the rotating shaft of the rotor core (1).

2. The high power density permanent magnet rotor according to claim 1, characterized in that the magnetic conduction holes (5) are circular holes.

3. The high power density permanent magnet rotor according to claim 1, wherein the magnetic conducting hole (5) is a square hole, and one corner of the square hole is opposite to the middle of the accommodating groove (2).

4. A high power density permanent magnet rotor according to claim 3, characterized in that the corners of the square hole opposite to the middle of the receiving groove (2) are rounded.

5. The high power density permanent magnet rotor according to claim 1, characterized in that the flux hole (5) is a triangular hole, one corner of which is right opposite to the middle of the accommodating groove (2).

6. The high power density permanent magnet rotor according to claim 5, characterized in that the corners of the triangular hole opposite to the middle of the receiving groove (2) are rounded.

7. The high power density permanent magnet rotor according to claim 5 or 6, wherein the triangular apertures are isosceles triangular apertures.

8. The high power density permanent magnet rotor according to any of claims 1-6, wherein one side of the receiving groove (2) is provided with a limit step (4), and the permanent magnet (3) is clamped in the limit step (4).