CN114744799A - Rotor and axial magnetic motor - Google Patents

Abstract

The invention discloses a rotor, which comprises a rotor bracket, permanent magnet magnetic poles and magnetizer magnetic poles, wherein the permanent magnet magnetic poles and the magnetizer magnetic poles are distributed at intervals around the center of the rotor bracket; the rotor bracket is made of magnetizers, and magnetic poles of the magnetizers are formed on the rotor bracket. One of two adjacent permanent magnet magnetic poles is replaced by a magnetizer magnetic pole, so that the using amount of the permanent magnet magnetic pole is reduced by half, and the shaft cost is obviously reduced. Because a permanent magnet magnetic pole in the magnetic circuit is replaced by a magnetizer magnetic pole, the magnetomotive force is reduced by half, but the magnetic conductivity of the magnetizer magnetic pole is far greater than that of the permanent magnet, so the magnetic conductivity is greatly improved compared with the original magnetic conductivity, and the magnetic flux density in the invention can be close to that in the traditional scheme by reasonably selecting the length of the air gap. The invention also discloses an axial magnetic motor.

Description

Rotor and axial magnetic motor

Technical Field

The invention relates to the technical field of axial flux motors, in particular to a rotor and an axial flux motor.

Background

At present, most of permanent magnet materials are rare earth materials, the cost of the motor is continuously increased along with the increasing of the cost of the rare earth materials in recent years, and for an axial flux motor, the cost of the permanent magnet materials reaches about 40 percent of the total manufacturing cost.

Therefore, how to reduce the amount of permanent magnets and ensure the performance of the axial flux motor is a critical issue to be solved urgently by those skilled in the art.

Disclosure of Invention

The object of the invention is to reduce the amount of permanent magnets used while ensuring the performance of an axial flux machine. In order to achieve the purpose, the invention provides the following technical scheme:

a rotor comprises a rotor bracket, permanent magnet poles and magnetizer poles, wherein the permanent magnet poles and the magnetizer poles are distributed at intervals around the center of the rotor bracket;

the rotor bracket is made of magnetizers, magnetizer magnetic poles are formed in the rotor bracket, an installation groove is formed between every two adjacent magnetizer magnetic poles, the edge part of the installation groove on the rotor bracket is of an open structure, and permanent magnet magnetic poles are installed in the installation groove.

Preferably, be provided with the card on the lateral wall of mounting groove protruding, the card is protruding along rotor support's radial extension, be provided with on the lateral wall of permanent magnet magnetic pole with the draw-in groove of protruding adaptation of card.

Preferably, the permanent magnet rotor further comprises a guard ring, and the guard ring is sleeved on the peripheries of the rotor and the permanent magnet.

Preferably, the material of the guard ring is non-magnetic material.

Preferably, the permanent magnet pole includes a plurality of permanent magnet pole pieces assembled into the permanent magnet pole in a radial direction of the rotor frame.

Preferably, the permanent magnet pole blocks are bonded by glue to form the permanent magnet poles.

Preferably, all the permanent magnet poles have the same magnetizing direction and are along the thickness direction of the permanent magnet poles.

The invention also provides an axial flux motor which comprises two stators and a rotor, wherein the rotor is positioned between the two stators, and the rotor is any one of the rotors.

Preferably, a closed loop system is also included for injecting a target harmonic current to the armature winding for attenuating or eliminating a pulsating torque of the axial flux machine.

In the traditional rotor, a magnetic loop is generated between two adjacent permanent magnet magnetic poles, and one of the two adjacent permanent magnet magnetic poles is replaced by a magnetizer magnetic pole, so that the use amount of the permanent magnet magnetic pole is reduced by half, and the cost of the axial flux motor is obviously reduced. Because one permanent magnet magnetic pole in the magnetic loop is replaced by the magnetizer magnetic pole, the magnetomotive force is reduced by half, but the magnetic conductivity of the magnetizer magnetic pole is far greater than that of the permanent magnet, so the magnetic conductivity is greatly improved compared with the original magnetic conductivity, and the magnetic flux density in the invention is close to that in the traditional scheme by reasonably selecting the length of the air gap. The present invention also provides a closed loop system to attenuate or eliminate ripple torque, thereby improving the torque quality of the axial flux machine.

Drawings

In order to more clearly illustrate the solution of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive effort.

Fig. 1 is a schematic structural diagram of a permanent magnet pole according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a rotor support according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a guard ring according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a rotor according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an assembled rotor and stator according to an embodiment of the present invention.

Wherein, 1 is a permanent magnet magnetic pole, 1-1 is a clamping groove, 2 is a rotor bracket, 2-1 is a mounting groove, 2-2 is a clamping protrusion, 2-3 is a magnetizer magnetic pole, 3 is a protective ring, 4 is a stator core, and 5 is a stator winding.

Detailed Description

The invention discloses a rotor, which can halve the usage of permanent magnet magnetic poles and simultaneously ensure that an axial flux motor has the same performance as a traditional axial flux motor. The invention also discloses an axial magnetic motor.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

The rotor disclosed by the invention comprises a rotor bracket 2 and a permanent magnet magnetic pole 1, and particularly also comprises magnetizer magnetic poles 2-3. The permanent magnet magnetic poles 1 and the magnetizer magnetic poles 2-3 are arranged at intervals around the center of the rotor bracket 2. Then a magnetic circuit is created between the adjacent permanent magnet pole 1 and the magnetizer pole 2-3. In the traditional rotor, a magnetic loop is generated between two adjacent permanent magnet poles 1, and one of the two adjacent permanent magnet poles 1 is replaced by a magnetizer magnetic pole 2-3, so that the use amount of the permanent magnet poles 1 is reduced by half, and the cost of the axial flux motor is obviously reduced.

It should be noted that the magnitude of the magnetic flux density is proportional to the product of the magnetomotive force and the flux guide, and the magnetomotive force is approximately proportional to the length of the magnetization direction of the permanent magnet pole 1. According to the invention, one permanent magnet magnetic pole 1 in the magnetic circuit is replaced by the magnetizer magnetic pole 2-3, so that the magnetomotive force is reduced by half, but the magnetic conductivity of the magnetizer magnetic pole 2-3 is far greater than that of the permanent magnet, and therefore, the magnetic conductivity is greatly improved compared with the original magnetic conductivity. By reasonably selecting the length of the air gap, the magnetic flux density in the invention can be close to that in the traditional scheme. Therefore, the invention reduces the use amount of the permanent magnet magnetic poles 1 by half and simultaneously ensures that the axial flux motor has the same performance as the traditional axial flux motor.

In an embodiment of the present invention, the material of the rotor frame 2 is preferably a magnetizer, that is, the entire rotor frame 2 is a magnetizer. Several permanent magnet poles 1 are arranged around the center of the rotor frame 2. The part of the rotor support 2 located between two adjacent permanent magnet poles 1 is referred to as the magnetizer pole 2-3, and thus it can be understood that the magnetizer pole 2-3 is formed on the rotor support 2. For example, in a conventional rotor, 12 permanent magnet poles 1 are provided, whereas in the present invention only 6 permanent magnet poles 1 are required. The 6 permanent magnet magnetic poles 1 are arranged on the rotor support 2 made of magnetic materials. The rotor structure in the invention simplifies the manufacturing difficulty and improves the manufacturing efficiency.

The permanent magnet magnetic pole 1 is formed by assembling a plurality of permanent magnet magnetic pole 1 blocks. The permanent magnet magnetic poles 1 are arranged and assembled along the radial direction of the rotor support 2 and then are bonded into a whole by using special glue. The permanent magnet pole 1 assembled by a plurality of permanent magnet poles 1 can reduce eddy current loss.

The permanent magnet pole 1 and the rotor support 2 are mounted in the following way: an installation groove 2-1 is formed between two adjacent magnetizer magnetic poles on the rotor bracket 2, and the installation groove 2-1 extends to the edge portion of the rotor bracket 2. That is, the mounting groove 2-1 is open at the edge portion of the rotor holder 2, so that the permanent magnet pole 1 can be mounted into the mounting groove 2-1 through the open structure.

In order to ensure the firmness of installation, the invention also provides the following settings: the side wall of the mounting groove 2-1 is provided with a clamping protrusion 2-2, and the clamping protrusion 2-2 is strip-shaped and extends along the radial direction of the rotor support 2. Correspondingly, a slot 1-1 is provided on the side wall of the permanent magnet pole 1, which slot 1-1 also extends in the radial direction of the rotor support 2. When the permanent magnet rotor is installed, the clamping groove 1-1 is aligned with the clamping protrusion 2-2 in advance, and then the permanent magnet magnetic pole 1 is pushed into the installation groove 2-1 along the radial direction of the rotor support 2.

In order to further improve the firmness of installation, the invention is also provided with the protective ring 3, and the protective ring 3 is sleeved on the rotor support 2 and the periphery of the permanent magnet magnetic pole so as to further improve the firmness of the connection of the permanent magnet magnetic pole 1 and the rotor support 2. In order to prevent magnetic leakage, the material of the guard ring 3 is non-magnetic material.

For a traditional rotor, the magnetizing directions of two adjacent permanent magnet magnetic poles 1 are opposite, and the magnetizing directions of all the permanent magnet magnetic poles 1 are the same and are along the thickness direction of the permanent magnet magnetic poles 1 or the axial direction of the axial flux motor, so that the manufacturing difficulty is further reduced, and the manufacturing efficiency is improved.

The invention also discloses an axial magnetic motor which comprises two stators and a rotor. The rotor is disposed between the two stators. The rotor is any one of the rotors described above. The rotor has the above-mentioned effects, and the axial flux motor having the rotor also has the above-mentioned effects, so the details are not described herein.

The applicant finds that because the permanent magnet magnetic poles 1 and the magnetizer magnetic poles 2-3 are distributed at intervals, the permeance of the permanent magnet magnetic poles 1 is small, and the permeance of the magnetizer magnetic poles 2-3 is large, the air gap magnetic field of the axial flux motor is poor, the content of magnetic field harmonic waves is increased, and the amplitude of the pulsating torque is large.

To this end, the applicant has provided a closed-loop system capable of inputting to the armature windings, depending on the speed and torque of the axial flux machine, a target harmonic current that will generate a target harmonic magnetic field that will form a pulsating torque component that will attenuate or cancel the pulsating torque of the axial flux machine.

Finally, it should be further noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. A rotor comprises a rotor bracket and permanent magnet magnetic poles, and is characterized by also comprising magnetizer magnetic poles, wherein the permanent magnet magnetic poles and the magnetizer magnetic poles are distributed at intervals around the center of the rotor bracket;

the rotor support is made of magnetizers, magnetizer magnetic poles are formed on the rotor support, an installation groove is formed between every two adjacent magnetizer magnetic poles, the installation groove is of an open structure at the edge of the rotor support, and the permanent magnet magnetic poles are installed in the installation groove.

2. The rotor of claim 1, wherein a clamping protrusion is arranged on a side wall of the mounting groove, the clamping protrusion extends along the radial direction of the rotor support, and a clamping groove matched with the clamping protrusion is arranged on a side wall of the permanent magnet magnetic pole.

3. The rotor of claim 1, further comprising a guard ring that fits around the periphery of the rotor and the permanent magnet poles.

4. The rotor of claim 3, wherein the guard ring is made of a non-magnetic material.

5. The rotor of claim 1, wherein the permanent magnet pole comprises a plurality of permanent magnet pole pieces assembled into the permanent magnet pole in a radial direction of the rotor frame.

6. The rotor of claim 5, wherein a plurality of the permanent magnet pole pieces are bonded to each other by glue to form the permanent magnet poles.

7. The rotor of claim 1, wherein all of the permanent magnet poles are magnetized in the same direction and along the thickness direction of the permanent magnet poles.

8. An axial flux machine comprising two stators and a rotor, said rotor being located between said two stators, wherein said rotor is according to any one of claims 1 to 7.

9. The axial-flux electric machine of claim 8, further comprising a closed-loop system for injecting a target harmonic current to the armature windings, the target harmonic current for attenuating or eliminating a pulsating torque of the axial-flux electric machine.

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