Axial annular permanent magnet magnetization permanent magnet synchronous drive motor and method thereof

Abstract

The present invention discloses an axial annular permanent magnet magnetization synchronous drive motor and a method thereof. The motor comprises a first rotor and a second rotor. The yokes of the first and second rotors are both provided with rib structures, and the rib structures of the two rotor sections are staggered so that the polarities of the rib structures of the two rotor sections are opposite. The ends of the first and second rotors are both provided with magnetic spokes connected to the rib structures of the corresponding rotor sections, and the magnetic spokes of the two rotor sections have opposite polarities. The magnetic spokes of the two rotor sections extend to a single-sided annular sleeve located on one end of the first or second rotor, and an annular permanent magnet is disposed within the single-sided annular sleeve. The magnetic flux generated by the annular permanent magnet on the single-sided annular sleeve enters the stator-rotor air gap, and the amount of the magnetic flux generated by the annular permanent magnet that enters the motor's main magnetic flux is adjusted by adjusting the air gap length between the single-sided annular sleeve and the magnetic spokes, thereby achieving motor main magnetic flux regulation.

Description

Technical Field

[0001] The present invention relates to the technical field of permanent magnet synchronous motors, and in particular to an axial annular permanent magnet magnetization-modulated permanent magnet synchronous drive motor and a method thereof. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Permanent magnet synchronous motors (PMSMs), with their advantages of simple structure, compact size, light weight, and high efficiency, have attracted considerable attention from scholars both domestically and internationally, and are increasingly being used in industrial applications. In systems such as electric traction, spindle drives, and wind power generation, the motors must operate over a wide speed range. Above base speed, PMSMs can only increase speed through d-axis current field weakening. However, the large reluctance of permanent magnets makes air gap magnetic field regulation difficult. Furthermore, excessive d-axis current can cause permanent magnet demagnetization. Therefore, PMSMs struggle to operate over a wide speed range. While traditional DC motors can adjust speed by varying the excitation current, electrically excited synchronous motors can similarly adjust the air gap magnetic field strength by varying the excitation current, achieving wide speed regulation. However, excitation losses reduce motor efficiency, making it difficult to achieve high power density and high efficiency, thus limiting their application.

[0004] Hybrid excitation is a motor developed by combining permanent magnet and electric excitation. A hybrid excitation motor has two magnetic potential sources: one generated by permanent magnets and the other by electric excitation. The permanent magnets generate the primary magnetic flux, while the electric excitation generates the auxiliary magnetic flux. The flux generated by the permanent magnets is regulated by magnetization and field weakening, and their interaction achieves electromagnetic energy conversion. Therefore, hybrid excitation motors combine the advantages of both permanent magnet and electric excitation synchronous motors while overcoming their respective disadvantages.

[0005] However, according to the inventor's understanding, the existing hybrid excitation motor has the following disadvantages:

[0006] 1. The electromagnetic excitation magnetic circuit has many additional air gaps, the axial magnetic field is restricted by the motor diameter, and the motor structure is complex. It is necessary to design a magnetic flux distribution circuit by adding support components and magnetic conductive components in a compact permanent magnet motor topology, which increases the size of the motor and increases the manufacturing difficulty and processing cost of the motor.

[0007] 2. The use of electric excitation windings results in magnetic field losses, and the windings are typically placed inside the motor, increasing the complexity of the mechanical structure, reducing efficiency and reliability, and making heat dissipation difficult to resolve. Furthermore, the electric excitation windings typically act on the motor's magnetic leakage circuit, resulting in relatively low magnetic field adjustment capabilities.

[0008] 3. Structural design is difficult. When designing the magnetic circuit within a highly integrated permanent magnet motor, existing technologies typically separate the leakage magnetic circuit and add an electric excitation winding to it. This hybrid excitation magnetic circuit is achieved by constructing a large number of auxiliary magnetic circuits and magnetic isolation bridges. This results in high manufacturing costs and difficulty achieving good magnetic modulation effects. The electric excitation winding applies a high-amplitude magnetic modulation current, resulting in low magnetic modulation efficiency. Summary of the Invention

[0009] In order to solve the above problems, the present invention proposes an axial annular permanent magnet magnetic modulation permanent magnet synchronous drive motor and a method thereof, wherein the magnetic spokes extend beyond the end of one side of the motor, and the end face of the side end is provided with a single-sided annular sleeve corresponding to the inner and outer ring magnetic spokes. By adjusting the axial air gap between the two, the magnetization amount of the end annular permanent magnet on the main magnetic flux of the motor can be adjusted, thereby realizing the main magnetic flux adjustment of the motor.

[0010] In order to achieve the above object, the present invention adopts the following technical solutions:

[0011] In a first aspect, the present invention provides an axial annular permanent magnet magnetic modulation permanent magnet synchronous drive motor, comprising: a stator, a first rotor, a second rotor and a single-sided annular sleeve;

[0012] The first rotor and the second rotor are coaxially connected and both are built into the stator;

[0013] The yokes of the first rotor and the second rotor are both provided with rib structures, and the rib structures of the two rotor sections are staggered so that the polarities of the rib structures of the two rotor sections are opposite;

[0014] The ends of the first rotor and the second rotor are both provided with magnetic spokes, which are connected to the rib structure of the corresponding rotor segment, and the magnetic spokes of the first rotor and the second rotor have different radii and opposite polarities;

[0015] The magnetic spokes of the two rotor sections extend to the side of a single-sided annular sleeve, which is located on one side of the end of the first rotor or the second rotor, and an annular permanent magnet is provided in the single-sided annular sleeve;

[0016] The magnetic flux generated by the annular permanent magnet on the single-sided annular sleeve enters the stator and rotor air gap through the single-sided annular sleeve, the magnetic spokes, the rib structure and the rotor yoke, and the magnetic flux generated by the annular permanent magnet entering the main magnetic flux of the motor is adjusted by adjusting the air gap length between the single-sided annular sleeve and the magnetic spokes.

[0017] As an optional embodiment, the stator is coaxially arranged with the first rotor and the second rotor, and there is an air gap between the stator and the rotor. A part of the magnetic flux generated by the rotor passes through the outer diameter of the rotor into the air gap to form the main magnetic flux of the motor.

[0018] As an optional embodiment, the first rotor and the second rotor have the same structure, are coaxially connected and have opposite polarities.

[0019] As an optional embodiment, the rib structures of the two rotor sections are staggered and formed with staggered angles.

[0020] As an optional implementation, the staggered angle is 360 / 2p degrees, where p is the number of motor pole pairs.

[0021] As an optional embodiment, the magnetic conductive spokes of the first rotor and the magnetic conductive spokes of the second rotor both extend to one side of the single-sided annular sleeve and have the same end surface extension length.

[0022] As an optional embodiment, the magnetic spokes of the first rotor are outer ring magnetic spokes, the magnetic spokes of the second rotor are inner ring magnetic spokes, the inner wall and outer wall of the single-sided annular sleeve correspond to the inner ring magnetic spokes and the outer ring magnetic spokes respectively, and the polarity of the inner and outer walls of the single-sided annular sleeve is the same as the polarity of the corresponding inner and outer ring magnetic spokes.

[0023] As an optional embodiment, the air gap length is negatively correlated with the amount of magnetic flux of the annular permanent magnet entering the main magnetic flux of the motor.

[0024] As an optional embodiment, during the motor starting process, the single-sided annular sleeve and the annular permanent magnet are adjusted to be close to the magnetic spokes, reducing the air gap length and increasing the magnetic flux generated by the annular permanent magnet entering the main magnetic flux of the motor to magnetize the motor;

[0025] When the motor is started, the single-sided annular sleeve and the annular permanent magnet are adjusted away from the magnetic spokes to increase the air gap length and reduce the amount of magnetic flux generated by the annular permanent magnet entering the main magnetic flux of the motor. The main magnetic flux of the motor is provided by the rotor, and the motor is in normal operation.

[0026] In a second aspect, the present invention provides a driving method for an axial annular permanent magnet magnetic field modulation permanent magnet synchronous drive motor, which is applied to the axial annular permanent magnet magnetic field modulation permanent magnet synchronous drive motor described in the first aspect, comprising:

[0027] During the motor starting process, by adjusting the single-sided annular sleeve and the annular permanent magnet, the air gap length between the single-sided annular sleeve and the magnetic spokes is reduced, and the magnetic flux generated by the annular permanent magnet enters the stator and rotor air gap through the single-sided annular sleeve, the magnetic spokes and the rib structure, thereby increasing the magnetic flux generated by the annular permanent magnet entering the main magnetic flux of the motor;

[0028] When the motor completes the starting process and is in normal operation, by adjusting the single-sided annular sleeve and the annular permanent magnet, the air gap length between the single-sided annular sleeve and the magnetic spokes is increased. The magnetic flux generated by the annular permanent magnet does not enter the stator and rotor air gap. The main magnetic flux of the motor is provided by the permanent magnets in the rotor slots, and the motor is in normal operation.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The hybrid excitation motor of the present invention uses an end annular permanent magnet sleeve as the magnetic source of the magnetic modulation branch. The main magnetic flux of the motor can be adjusted by adjusting the air gap length between the end annular permanent magnet sleeve and the axial magnetic pole of the rotor. The magnetic modulation efficiency is high and there is no risk of irreversible demagnetization of the permanent magnets of the permanent magnet motor, which significantly improves the operational reliability of the drive system.

[0031] 2. The motor of the present invention utilizes the necessary support components of a spoke-type rotor to construct the magnetic flux modulation circuit, eliminating the need for additional magnetic conductive components within the motor. This results in a relatively convenient design, low cost, and no additional radial volume increase for the motor. The motor utilizes permanent magnets with an annular permanent magnet sleeve at the end for magnetic modulation, and a hybrid excitation magnetic circuit for additional flux regulation. This increases the motor's power density, achieving a peak power density higher than comparable permanent magnet motors, high magnetic modulation efficiency, and no copper loss.

[0032] 3. Strong magnetic adjustment capability, relatively wide operating range and strong starting capability. The hybrid excitation magnetic adjustment permanent magnet motor of the present invention provides excellent magnetic flux adjustment capability by designing an end annular permanent magnet sleeve excitation magnetic circuit and injecting the magnetic flux of the end permanent magnet into the motor's main magnetic circuit. The air gap length between the end annular permanent magnet sleeve and the rotor axial magnetic pole is adjusted to adjust the motor's main magnetic circuit. Due to the flexible design of the thickness of the permanent magnet in the end permanent magnet sleeve, the motor can provide excellent magnetic flux adjustment capability.

[0033] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0035] Figure 1 This is a schematic diagram of the overall structure of the motor provided in Example 1 of the present invention;

[0036] Figure 2 A three-dimensional view of the motor rotor and the single-sided annular sleeve at the end provided in Example 1 of the present invention, viewed from the inner ring side of the magnetic spokes;

[0037] Figure 3A three-dimensional view of the motor rotor and the single-sided annular sleeve at the end provided in Example 1 of the present invention, viewed from the outer ring side of the magnetic spokes;

[0038] Figure 4 Schematic diagram of the annular sleeve and annular permanent magnet at the end of the motor provided in Example 1 of the present invention;

[0039] Among them, 1. first rotor, 2. second rotor, 3. permanent magnet, 4. first rib structure, 5. second rib structure, 6. outer ring magnetic spokes, 7. inner ring magnetic spokes, 8. stator, 9. armature winding, 10. stator slots, 11. stator teeth, 12. single-sided annular sleeve, 13. annular permanent magnet. DETAILED DESCRIPTION

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0041] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0042] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] In the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0044] Example 1

[0045] This embodiment provides an axial annular permanent magnet magnetization permanent magnet synchronous drive motor, comprising: a stator 8, a first rotor 1, a second rotor 2, a single-sided annular sleeve 12 and an annular permanent magnet 13;

[0046] The first rotor 1 and the second rotor 2 are coaxially connected and both are built into the stator 8;

[0047] The yokes of the first rotor 1 and the second rotor 2 are both provided with rib structures, and the rib structures of the two rotor sections are staggered so that the polarities of the rib structures of the two rotor sections are opposite;

[0048] The ends of the first rotor 1 and the second rotor 2 are both provided with magnetic spokes, which are connected to the rib structure of the corresponding rotor segment. The magnetic spokes of the first rotor and the second rotor have different radii and opposite polarities.

[0049] The magnetic spokes of the two rotor sections extend to the side of the single-sided annular sleeve 12, which is located on one side of the end of the first rotor 1 or the second rotor 2. An annular permanent magnet 13 is provided in the single-sided annular sleeve 12;

[0050] The magnetic flux generated by the annular permanent magnet 13 on the single-sided annular sleeve 12 enters the stator and rotor air gap through the single-sided annular sleeve 12, the magnetic spokes, the rib structure and the rotor yoke, and the magnetic flux generated by the annular permanent magnet 13 entering the main magnetic flux of the motor is adjusted by adjusting the air gap length between the single-sided annular sleeve 12 and the magnetic spokes.

[0051] like Figure 1 As shown, the stator 8 is made of laminated silicon steel sheets. The stator 8 includes stator slots 10, stator teeth 11 and a stator yoke. The armature winding 9 is placed in the stator slots 10.

[0052] As an optional implementation, the armature winding 9 can be a single-layer winding or a double-layer winding.

[0053] As an optional implementation, the armature winding 9 can be divided into distributed winding, concentrated winding or lap winding.

[0054] As an optional embodiment, the number of poles of the armature winding 9 is consistent with the number of rotor poles.

[0055] As an optional embodiment, the stator 8 is coaxially arranged with the first rotor 1 and the second rotor 2, and there is an air gap between the stator and the rotor. A part of the magnetic flux generated by the rotor passes through the outer diameter of the rotor into the air gap to form the main magnetic flux of the motor.

[0056] like Figure 2-Figure 4 As shown, the rotor of this embodiment includes a first rotor 1 and a second rotor 2 with the same structure, coaxial connection and opposite polarities;

[0057] The yoke of the first rotor 1 is provided with a first rib structure 4, and the yoke of the second rotor 2 is provided with a second rib structure 5. The first rib structure 4 and the second rib structure 5 are staggered and formed with a staggered angle so that the rib structures of the two rotor sections have opposite polarities.

[0058] As an optional implementation manner, the staggered angle is 360 / 2p degrees, where p is the number of motor pole pairs.

[0059] As an optional embodiment, the first rib structure 4 and the second rib structure 5 are respectively connected to the N pole or S pole of the corresponding rotor segment, so that the rib structure of the rotor segment and the magnetic spokes connected thereto have the same polarity, and the rib structures and magnetic spokes of the two rotor segments have opposite polarities.

[0060] In this embodiment, an outer ring of magnetic conductive spokes 6 is connected to the first rib structure 4 at the end of the first rotor 1, and an inner ring of magnetic conductive spokes 7 is connected to the second rib structure 5 at the end of the second rotor 2. The outer ring of magnetic conductive spokes 6 and the inner ring of magnetic conductive spokes 7 have opposite magnetic polarities. The outer ring of magnetic conductive spokes 6 and the inner ring of magnetic conductive spokes 7 both extend to one side of the rotor end and have the same end surface extension length.

[0061] A single-sided annular sleeve 12 is provided at the other end of the first rotor 1 or the second rotor 2, and an annular permanent magnet 13 is provided in the single-sided annular sleeve 12. The outer ring magnetic spokes 6 and the inner ring magnetic spokes 7 extend to the side of the single-sided annular sleeve 12. The inner wall and outer wall of the single-sided annular sleeve 12 correspond to the inner ring magnetic spokes 7 and the outer ring magnetic spokes 6 respectively. The polarity of the inner and outer walls of the single-sided annular sleeve 12 is the same as the polarity of the corresponding inner and outer ring magnetic spokes. The magnetic flux generated by the annular permanent magnet can enter the stator and rotor air gap along the "single-sided annular sleeve-magnetic spokes-rotor ribs-rotor yoke" to enhance the main magnetic flux of the motor.

[0062] In this embodiment, the single-sided annular sleeve 12 and the annular permanent magnet 13 are mechanically movable parts, and the air gap length between them and the inner and outer ring magnetic spokes can be adjusted. The air gap length is negatively correlated with the magnetic flux of the annular permanent magnet 13 entering the main magnetic flux of the motor.

[0063] As an optional embodiment, the adjustment mode of the air gap length can be set to two gears of "large air gap - small air gap", which corresponds to the starting state and the normal operating state;

[0064] Alternatively, it can be set to multi-stage regulation, in which case different magnetic fluxes are provided to the motor through the annular permanent magnet and the single-sided annular sleeve according to the changes in the starting / running state;

[0065] Alternatively, the design is stepless adjustment, in which case different magnetic fluxes are provided to the motor through the annular permanent magnet and the single-sided annular sleeve according to changes in the starting / running state, and the adjustment is smoother.

[0066] In this embodiment, when the motor is in the starting process, the unilateral annular sleeve 12 and the annular permanent magnet 13 are adjusted to be close to the inner and outer ring magnetic spokes to reduce the air gap length. The magnetic flux generated by the annular permanent magnet can enter the stator along the "unilateral annular sleeve-inner and outer ring magnetic spokes-rotor ribs-rotor yoke", thereby increasing the magnetic flux entering the main magnetic flux of the motor, increasing the starting torque of the motor, reducing the starting current, and enhancing the starting ability.

[0067] After the motor completes the starting process, the single-sided annular sleeve 12 and the annular permanent magnet 13 are adjusted away from the inner and outer ring magnetic spokes to increase the air gap length, reduce the magnetic flux entering the main magnetic flux of the motor, and even the magnetic flux of the annular permanent magnet 13 no longer enters the stator 8. The main magnetic flux of the motor is provided by the permanent magnet 3 on the rotor, and the motor is in normal operation.

[0068] In this embodiment, each rotor segment has eight rotor slots for accommodating permanent magnets 3. The magnetization directions of two adjacent permanent magnets are opposite. The two adjacent permanent magnets and the rotor core between them generate radial magnetic poles in the radial direction. The magnetic flux generated by the permanent magnets passes through the radial magnetic poles and the air gap into the stator core and interlinks with the armature winding to form the main magnetic flux. The main magnetic flux of the motor interacts with the magnetic flux generated by the stator armature winding to generate output torque.

[0069] Then, when the permanent magnet synchronous motor is working, the magnetic flux generated by the permanent magnet passes through the radial magnetic poles and the air gap into the stator core and interlinks with the armature winding to form the main magnetic flux. In addition, the magnetic flux generated by the single-sided annular sleeve and the annular permanent magnet can also pass through the "single-sided annular sleeve-magnetic spokes-rotor ribs-rotor yoke" to enter the stator to form the main magnetic flux of the motor. The amount of magnetic flux entering the main magnetic flux of the motor can be adjusted by adjusting the air gap length.

[0070] As an optional embodiment, the permanent magnets are arranged in a certain combination to achieve a magnetic concentration effect, forming radial magnetic poles in the radial direction of the rotor. The magnetic flux generated by the permanent magnets can enter the air gap radially, and the solid rotor can generate eddy currents when the motor starts, thereby achieving self-starting.

[0071] As an optional embodiment, the rotor can be a solid rotor made of a soft magnetic composite material with high magnetic permeability. The solid rotor has high magnetic permeability, or it can be made of stacked silicon steel sheets and connected to magnetic spokes made of pure steel through fasteners or bolts. After the fixed connection, it can be filled and fixed as a whole with epoxy resin to improve the mechanical strength of the rotor system.

[0072] As an optional embodiment, the permanent magnet is a high-performance permanent magnet material, such as neodymium iron boron, rare earth cobalt, or a low-performance permanent magnet material, such as aluminum nickel cobalt or ferrite.

[0073] As an optional implementation manner, the number of motor phases m≥3, and the number of motor pole pairs p≥1.

[0074] In this embodiment, various performances are achieved by reasonably designing various parameters of the motor, such as the air gap length, the number of turns of the stator armature winding, and the number of turns of the rotor built-in current winding, based on the rated speed, rated torque, and specific performance requirements of the motor. For example, the number of motor phases is designed to be 3, the number of stator teeth is designed to be 48, the number of rotor slots is designed to be 8, the two-section rotor has a total of 8 ribs, the number of permanent magnet blocks is designed to be 16, and the number of rotor poles is designed to be 8.

[0075] Example 2

[0076] This embodiment provides a torque drive method for an axial annular permanent magnet magnetization permanent magnet synchronous drive motor. Current applied to the stator armature winding interacts with the rotor's main magnetic field to generate driving torque. The annular sleeve at the end of the motor and its annular permanent magnet adjust the axial air gap between them and the rotor's magnetic spokes through mechanical movable components to adjust the main magnetic flux of the motor. Specifically, the method includes:

[0077] During the motor starting process, the annular sleeve and annular permanent magnet at the end of the motor are adjusted through the mechanical movable parts to reduce the air gap between the end annular sleeve and the magnetic spokes of the rotor. The magnetic flux generated by the end annular permanent magnet enters the air gap of the motor through the "annular sleeve-magnetic spokes-rotor ribs-rotor yoke", increasing the main magnetic flux of the motor and enhancing the starting ability.

[0078] When the motor completes the starting process and is in normal operation, the annular sleeve and annular permanent magnet at the end of the motor are adjusted through the mechanical movable parts to increase the air gap between the end annular sleeve and the magnetic spokes of the rotor. The magnetic flux generated by the end annular permanent magnet no longer enters the rotor. The main magnetic flux of the motor is provided entirely by the permanent magnets in the rotor slots of the motor, and the motor is in normal operation.

[0079] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.

Claims

1. An axial annular permanent magnet magnetization permanent magnet synchronous drive motor, characterized in that: include: stator, first rotor, second rotor and single-sided annular sleeve; The first rotor and the second rotor are coaxially connected and both are built into the stator; The yokes of the first rotor and the second rotor are both provided with rib structures, and the rib structures of the two rotor sections are staggered so that the polarities of the rib structures of the two rotor sections are opposite; The ends of the first rotor and the second rotor are both provided with magnetic spokes, which are connected to the rib structure of the corresponding rotor segment, and the magnetic spokes of the first rotor and the second rotor have different radii and opposite polarities; The magnetic spokes of the two rotor sections extend to the side of a single-sided annular sleeve, which is located on one side of the end of the first rotor or the second rotor, and an annular permanent magnet is provided in the single-sided annular sleeve; The magnetic flux generated by the annular permanent magnet on the single-sided annular sleeve enters the stator-rotor air gap through the single-sided annular sleeve, the magnetic spokes, the rib structure and the rotor yoke, and the magnetic flux generated by the annular permanent magnet entering the main magnetic flux of the motor is adjusted by adjusting the air gap length between the single-sided annular sleeve and the magnetic spokes; The stator is coaxially arranged with the first rotor and the second rotor, and there is an air gap between the stator and the rotor. A part of the magnetic flux generated by the rotor passes through the outer diameter of the rotor and enters the air gap to form the main magnetic flux of the motor; The first rotor and the second rotor have the same structure, are coaxially connected and have opposite polarities; When the motor is starting, the annular sleeve on one side and the annular permanent magnet are adjusted to be close to the magnetic spokes to reduce the air gap length and increase the magnetic flux generated by the annular permanent magnet entering the main magnetic flux of the motor to magnetize the motor; When the motor is started, the single-sided annular sleeve and the annular permanent magnet are adjusted away from the magnetic spokes to increase the air gap length and reduce the amount of magnetic flux generated by the annular permanent magnet entering the main magnetic flux of the motor. The main magnetic flux of the motor is provided by the rotor, and the motor is in normal operation.

2. The axial annular permanent magnet magnetization permanent magnet synchronous drive motor according to claim 1, characterized in that: The rib structures of the two rotor sections are staggered and arranged at staggered angles.

3. The axial annular permanent magnet magnetization permanent magnet synchronous drive motor according to claim 2, characterized in that: The staggered angle is 360 / 2p degrees, where p is the number of motor pole pairs.

4. The axial annular permanent magnet magnetization permanent magnet synchronous drive motor according to claim 1, characterized in that: The magnetically conductive spokes of the first rotor and the magnetically conductive spokes of the second rotor both extend to one side of the single-sided annular sleeve and have the same end surface extension length.

5. The axial annular permanent magnet magnetization permanent magnet synchronous drive motor according to claim 1, characterized in that: The magnetic spokes of the first rotor are outer ring magnetic spokes, and the magnetic spokes of the second rotor are inner ring magnetic spokes. The inner wall and outer wall of the single-sided annular sleeve correspond to the inner ring magnetic spokes and the outer ring magnetic spokes respectively. The polarity of the inner and outer walls of the single-sided annular sleeve is the same as the polarity of the corresponding inner and outer ring magnetic spokes.

6. The axial annular permanent magnet magnetization permanent magnet synchronous drive motor according to claim 1, characterized in that: The air gap length is negatively correlated with the amount of magnetic flux of the annular permanent magnet entering the main magnetic flux of the motor.

7. A driving method for an axial annular permanent magnet magnetization permanent magnet synchronous drive motor, characterized in that: The axial annular permanent magnet magnetization permanent magnet synchronous drive motor according to any one of claims 1 to 6 comprises: During the motor starting process, by adjusting the single-sided annular sleeve and the annular permanent magnet, the air gap length between the single-sided annular sleeve and the magnetic spokes is reduced, and the magnetic flux generated by the annular permanent magnet enters the stator and rotor air gap through the single-sided annular sleeve, the magnetic spokes and the rib structure, thereby increasing the magnetic flux generated by the annular permanent magnet entering the main magnetic flux of the motor; When the motor completes the starting process and is in normal operation, by adjusting the single-sided annular sleeve and the annular permanent magnet, the air gap length between the single-sided annular sleeve and the magnetic spokes is increased. The magnetic flux generated by the annular permanent magnet does not enter the stator and rotor air gap. The main magnetic flux of the motor is provided by the permanent magnets in the rotor slots, and the motor is in normal operation.

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