Multi-rotor magnetic gear composite permanent magnet motor with magnetism adjusted by magnetism adjusting ring

Abstract

The utility model relates to the technical field of composite permanent magnet motors, and discloses a multi-rotor magnetic gear composite permanent magnet motor with magnetism adjusted by a magnetism adjusting ring, which is characterized in that a permanent magnet stator is arranged on the inner surface of a motor shell; components in the permanent magnet rotor comprise a surface-mounted permanent magnet rotor and an embedded permanent magnet rotor. When current passes through the permanent magnet rotor assembly, electromagnetic force is generated through the current, so that the magnetic flux of the motor is changed. And the surface-mounted permanent magnet rotor assembly is of an independent structure and complements each other. The adjuster can adjust parameters of the magnetic gear through the magnetic adjusting ring, and the magnetic adjusting ring is of a half-crescent structure. According to the multi-rotor magnetic gear, the multi-rotor structure is simple and convenient, the torque pulsation is reduced, the magnetism adjusting performance is improved, and the defects that a common single magnetic gear is poor in torque restraining effect and inaccurate in magnetism adjusting are overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a magnetic gear composite permanent magnet motor with multiple rotors and magnetic adjustment rings for magnetic adjustment. Background Art

[0002] As a new type of non-contact gear structure that relies on magnetic field coupling to transmit torque, magnetic gears have the advantages of ultra-quiet, high-speed direct drive, greatly reduced maintenance and high efficiency. By combining magnetic gears with permanent magnet synchronous motors and reusing the inner rotor, a permanent magnet motor with large transmission torque is obtained, which can realize dual-rotor rotation. It has a surface-mounted permanent magnet rotor and an embedded permanent magnet rotor. It is a composite motor suitable for low-speed, high-torque, high-efficiency and many occasions.

[0003] Compared with coaxial magnetic gear motors, eccentric shaft motors have advantages in making components compact, reducing costs, and improving utilization, which is conducive to solving the problems of excessive conventional torque density and inaccurate magnetic parameters of magnetic gear magnetic adjustment units. At the same time, it is difficult to control the torque pulsation and increase the torque density. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a magnetic gear rotating motor capable of properly maintaining an air gap for a long time.

[0005] The specific plan is as follows:

[0006] A magnetic gear rotating motor capable of properly maintaining an air gap for a long time, comprising a permanent magnet stator, a permanent magnet rotor and a rotating shaft, wherein the permanent magnet stator is placed on the inner surface of the motor housing, and the stator yoke is provided with a permanent magnet ring, and the permanent magnet rotor is installed on the rotating shaft, comprising a surface-mounted permanent magnet rotor and an embedded permanent magnet rotor, wherein both the surface-mounted permanent magnet rotor and the embedded permanent magnet rotor are placed inside the permanent magnet stator, and the surface-mounted permanent magnet rotor component and the embedded permanent magnet rotor component form an independently arranged structure and do not affect each other, the rotor forms an eccentric 12° structure and is stably suspended inside the stator, and when the eccentricity is 12°, a six-degree-of-freedom magnetic field can be generated, greatly reducing the structural difficulty of the motor, and the rotating shaft comprises a first rotating shaft, a second rotating shaft, and a second rotating shaft, which are arranged in sequence. The first rotating shaft, the second rotating shaft and the third rotating shaft share a central axis, wherein a surface-mounted permanent magnet rotor and a magnetic adjustment unit are provided between the first rotating shaft and the second rotating shaft, and the surface-mounted permanent magnet rotor is sleeved on the first rotating shaft, and the magnetic adjustment unit can accurately capture the displacement of the surface-mounted permanent magnet rotor. An embedded permanent magnet rotor is provided between the second rotating shaft and the third rotating shaft, and the embedded permanent magnet rotor is provided with a first magnetic adjustment ring and a second magnetic adjustment ring, and the embedded first magnetic adjustment ring and the embedded second magnetic adjustment ring are offset-transmitted, and a magnetic adjustment unit is also provided at the other end, and the embedded second magnetic adjustment ring and the third rotating shaft are provided with a motion mechanism to transmit a large torque, realize non-contact dual-rotor motion, and greatly reduce the power of the whole machine. When current passes through the permanent magnet rotor component, an elliptical induced potential and an electromagnetic force are generated, thereby changing the magnetic flux of the motor. A suspension winding is wound between the permanent magnet rotor and the first magnetic adjustment ring, and a torque winding is wound between the permanent magnet stator and the second magnetic adjustment ring to form a locked magnetic field.

[0007] As a further improvement of the present invention, the permanent magnet rotor is composed of a rotor core.

[0008] As a further improvement of the present invention, the magnetic tuning unit is integrally circumferentially mounted on a surface-mounted permanent magnet rotor.

[0009] As a further improvement of the present invention, the magnetic adjustment ring is a half-moon-shaped structure. Compared with magnetic adjustment rings of other structures, it can reduce torque pulsation or improve torque density, solving the problem of torque pulsation suppression and the disadvantage of large torque density of eccentric magnetic gears. On the basis of ensuring the magnetic field area of ​​the magnetic adjustment ring parameters, the structural design of adjustable eccentricity of 12° can ensure that the air gap magnetic density remains unchanged, and reduce torque pulsation, and can compensate for the loss of torque. If the design of the concentric structure is adopted, the size of the air gap magnetic density can be reduced, but the torque will not produce energy loss. If it is necessary to ensure the performance at the same time, the torque pulsation can be reduced and the magnetic adjustment performance can be improved, solving the problems of stable air gap magnetic density, small torque pulsation, high magnetic adjustment performance and large transmission output torque. Finite element software analysis is used. When the magnetic gear speed regulator using a half-moon-shaped magnetic adjustment ring is connected to a current of 600A, the rated torque multi-displacement posture is simulated and analyzed, and a stable torque curve can be obtained. It is found that the magnetic adjustment can accurately adjust the displacement of the magnetic gear composite permanent magnet motor. The torque curve generated is a stable offset waveform, evenly distributed, and can well suppress the size of the torque pulsation and reduce the torque density. This allows precise magnetic adjustment, which can result in complementary interference between the rotor and stator, suppress strong coupling problems, and stabilize the output torque suspension force.

[0010] As a further improvement of the present invention, the magnetic tuning unit is installed on the rotor yoke.

[0011] As a further improvement of the present invention, a tail cover is provided at the rear end of the motor.

[0012] The beneficial effect of the utility model is that when the current passes through the permanent magnet rotor assembly, the current generates electromagnetic force, thereby changing the magnetic flux of the motor. And the surface-mounted permanent magnet rotor assembly is an independently set structure with complementary influence. The regulator can adjust the parameters of the magnetic gear through the magnetic adjustment ring, and the magnetic adjustment ring is a half-moon-shaped structure. The present invention utilizes the simplicity of the multi-rotor structure, reduces torque pulsation and improves magnetic adjustment performance, and solves the shortcomings of poor torque suppression effect and inaccurate magnetic adjustment of ordinary single magnetic gears. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A 3D structural view of a magnetic gear composite permanent magnet motor with magnetic adjustment rings for multiple rotors provided in an embodiment of the present invention.

[0014] Figure 2 A schematic diagram of the 2D connection end of a magnetic gear composite permanent magnet motor with magnetic field adjustment using a magnetic adjustment ring for multiple rotors provided in an embodiment of the present invention.

[0015] Figure 3 A schematic diagram of a magnetic gear composite permanent magnet motor structure with magnetic adjustment rings for adjusting the magnetic field of multiple rotors provided in an embodiment of the present invention.

[0016] List of reference numerals:

[0017] 1-tail cover, 2-permanent magnet stator, 3-permanent magnet ring, 4-torque winding, 5-second magnetic adjustment ring, 6-rotating shaft, 7-permanent magnet rotor, 8-rotor yoke, 9-magnetic adjustment unit, 10-first magnetic adjustment ring, 11-suspension winding, 12-stator yoke, 13-first rotating shaft, 14-second rotating shaft, 15-third rotating shaft. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific implementations. It should be understood that the following specific implementations are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0019] As shown in the figure, the present invention provides a magnetic gear rotating motor capable of properly maintaining an air gap for a long time, comprising a permanent magnet stator (2), a permanent magnet rotor (7) and a rotating shaft (6), wherein the permanent magnet stator (2) is disposed on the inner surface of the motor housing, and the stator yoke (12) is provided with a permanent magnet ring (3), and the permanent magnet rotor (7) is mounted on the rotating shaft (6), comprising a surface-mounted permanent magnet rotor and an embedded permanent magnet rotor, wherein both the surface-mounted permanent magnet rotor and the embedded permanent magnet rotor are disposed inside the permanent magnet stator (2), and the surface-mounted permanent magnet rotor component and the embedded permanent magnet rotor component form an independently arranged structure and do not affect each other, the rotor forms an eccentric 12° structure and is stably suspended inside the stator, and when the eccentric 12° is formed, a six-degree-of-freedom magnetic field can be generated, thereby greatly reducing the structural difficulty of the motor, and the rotating shaft (6) comprises A first rotating shaft (13), a second rotating shaft (14) and a third rotating shaft (15) are provided, wherein the first rotating shaft, the second rotating shaft and the third rotating shaft share a central axis, wherein a surface-mounted permanent magnet rotor and a magnetic adjustment unit (9) are provided between the first rotating shaft and the second rotating shaft, and the surface-mounted permanent magnet rotor is sleeved on the first rotating shaft, and the magnetic adjustment unit can accurately capture the displacement of the surface-mounted permanent magnet rotor, and an embedded permanent magnet rotor is provided between the second rotating shaft and the third rotating shaft, and a first magnetic adjustment ring (10) and a second magnetic adjustment ring (5) are provided on the embedded permanent magnet rotor, and the embedded first magnetic adjustment ring and the embedded second magnetic adjustment ring are offset-transmitted, and the magnetic adjustment unit is also provided at the other end, and a motion mechanism is provided between the embedded second magnetic adjustment ring and the third rotating shaft to transmit a large torque, realize non-contact dual-rotor motion, and greatly reduce the power of the whole machine. When current passes through the permanent magnet rotor component, an elliptical induced potential and an electromagnetic force are generated, thereby changing the magnetic flux of the motor. A suspension winding is wound between the permanent magnet rotor and the first magnetic adjustment ring, and a torque winding is wound between the permanent magnet stator and the second magnetic adjustment ring to form a locked magnetic field.

[0020] In this embodiment, the permanent magnet rotor (7) is composed of a rotor core.

[0021] In this embodiment, the magnetic adjustment unit (9) is integrally mounted circumferentially on the surface-mounted permanent magnet rotor.

[0022] In this embodiment, the permanent magnet ring (3) is a half-moon-shaped structure. Compared with other structures of magnetic adjustment rings, it can reduce torque pulsation or improve torque density, solving the problem of torque pulsation suppression and the disadvantage of high torque density of eccentric magnetic gears. On the basis of ensuring the magnetic field area of ​​the magnetic adjustment ring parameters, the structural design of adjustable eccentricity of 12° can ensure that the air gap magnetic density remains unchanged, and reduce torque pulsation, and can compensate for the loss of torque. If a concentric structure design is adopted, the size of the air gap magnetic density can be reduced, but the torque will not produce energy loss. If it is necessary to ensure performance at the same time, the torque pulsation can be reduced and the magnetic adjustment performance can be improved, solving the problems of stable air gap magnetic density, small torque pulsation, high magnetic adjustment performance and large transmission output torque. Finite element software analysis is used. When the magnetic gear speed regulator using a half-moon-shaped magnetic adjustment ring is connected to a current of 600A, the rated torque multi-displacement posture is simulated and analyzed, and a stable torque curve can be obtained. It is found that the magnetic adjustment can accurately adjust the displacement of the magnetic gear composite permanent magnet motor. The torque curve generated is a stable offset waveform with uniform distribution, and can well suppress the size of torque pulsation and reduce the torque density. This allows precise magnetic adjustment, which can result in complementary interference between the rotor and stator, suppress strong coupling problems, and stabilize the output torque suspension force.

[0023] In this embodiment, the magnetic tuning unit (9) is installed on the rotor yoke (8).

[0024] In this embodiment, a tail cover (1) is provided at the rear end of the motor.

[0025] In this embodiment, the permanent magnet rotor of the motor is composed of a rotor core, and the permanent magnet ring is distributed in a ring shape at a 12° offset angle on the axial surface of the permanent magnet rotor, which can accurately control and reduce torque pulsation and improve magnetic tuning performance, solving the shortcomings of poor torque suppression effect and inaccurate magnetic tuning of ordinary single magnetic gears. The magnetic tuning ring is adsorbed and installed on the rotor and stator, and the magnetic tuning unit is installed on the surface-mounted permanent magnet rotor in an integrated circumferential manner. The permanent magnet ring of the permanent magnet rotor is made of copper material. The magnetic flux can flow horizontally and vertically through the rotor core and flow in the direction of the combined force of the horizontal and vertical directions.

[0026] In this embodiment, the permanent magnet stator of the motor is composed of a stator core, the stator yoke has a longitudinally magnetized magnet, and the stator core includes a radial stator core and an axial stator core.

[0027] In this embodiment, the radial suspension force of the motor is generated, and 25 slots of suspension winding (11) are stacked in the stator slots. and With 10-pole torque winding (4) and When the motor is running at low load, the air gap flux density generated by the current in the torque winding (4) is negligible, and the symmetrical magnetic flux is generated by the 10 permanent magnet rings. and The currents in the magnetic field are mutually canceling, and the rotor will not generate radial suspension force; when After a positive current is passed through the middle, a comprehensive axial and longitudinal magnetic flux will be generated, the air gap magnetic density at point 1 on the right side will decrease, and the air gap magnetic density at point 3 on the left side will increase, thereby generating a torque suspension force in the positive direction of the Z axis, forming a larger magnetic potential and reducing torque pulsation;

[0028] if A negative current is passed through the magnetic tuning unit, which generates a torque suspension force. Similarly, the radial suspension force along the Z axis can be generated by Therefore, by controlling the suspension winding (11) and The current in the suspension force winding can control the direction of the suspension force winding, thereby achieving relatively stable suspension of the embedded first magnetic adjustment ring (10) and the embedded second magnetic adjustment ring (5), thereby providing a stable torque suspension resultant force.

[0029] When a stable saturated air gap magnetic field is generated on the central surface of the rotor, the rotor edge will be offset to the left and right. The coil current can be adjusted to increase the magnetic field and evenly distribute it on the rotor edge at 12°, thus breaking the magnetic field coupling and forming 10 semi-crescent-shaped magnetic flux densities. and

[0030] In this embodiment, when the permanent magnet motor offset angle reaches 348°, the speed can reach 30000r / min and the power can reach 20kw. The strong coupling interference force between the torque winding and the suspension winding generates a stable torque suspension force from the original rotor offset, so that the interference force between the rotor and the stator tends to 0, and the output pulse power is stable as the speed gradually increases, generating sufficient air gap magnetic density and providing controllability of the suspension system.

[0031] In this embodiment, the first magnetic adjustment ring is a circular ring structure, including a number of permanent magnet blocks and a rotor bracket, and the surface-mounted permanent magnet rotor and the magnetic adjustment unit are installed in an integrated manner. The stator consists of a stator core and a stator winding, the stator core is placed in the tooth slot, the stator winding is wound on the stator core, the torque winding is wound with a distributed winding structure, and the suspension winding is wound with a concentrated winding structure. The magnetic potential and induction current generated by the stator winding do not interfere with each other, realizing an independent control scheme.

[0032] Finite element software analysis was used to simulate and analyze the rated torque multi-displacement posture when the magnetic gear speed regulator with a half-moon type magnetic adjustment ring was connected to a 600A current, and a stable torque curve was obtained. It was found that the magnetic adjustment can accurately adjust the displacement of the magnetic gear composite permanent magnet motor. The torque curve generated is a stable offset waveform with uniform distribution, and can well suppress the size of torque pulsation and reduce the problem of torque density. Therefore, accurate magnetic adjustment can make the rotor and stator complementary interference, suppress the strong coupling problem, and can stabilize the output torque suspension force.

[0033] The implementation of permanent magnet stators and rotors with three axial directions and six degrees of freedom eliminates the original radial unbalanced force, and performs radial and axial synthesis and decomposition of the suspension force generated by the suspension force winding current, thereby realizing radial and axial suspension operation without the need to add radial magnetic suspension bearings, and can accurately compensate for coupling.

[0034] The motor can control the air gap magnetic flux in three axis directions and the six degrees of freedom movement in the X, Y and Z axis directions with an offset angle of 12°. The finite element software simulation method can achieve high-precision rotation speed, precise displacement self-detection, and accuracy of rotor offset displacement and dynamic response speed, which solves the shortcomings of ordinary single magnetic gears such as poor torque pulsation suppression, inaccurate magnetic adjustment and high torque density.

[0035] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A magnetic gear composite permanent magnet motor with multiple rotors and magnetic adjustment rings, characterized in that: The invention comprises a permanent magnet stator (2), a permanent magnet rotor (7) and a rotating shaft (6), wherein the permanent magnet stator (2) is arranged on the inner surface of the outer shell of the motor, and the stator yoke (12) is provided with a permanent magnet ring (3), and the permanent magnet rotor (7) is installed on the rotating shaft (6), and comprises a surface-mounted permanent magnet rotor and an embedded permanent magnet rotor, wherein both the surface-mounted permanent magnet rotor and the embedded permanent magnet rotor are arranged inside the permanent magnet stator (2), and the rotating shaft (6) comprises a first rotating shaft, a second rotating shaft and a third rotating shaft arranged in sequence, wherein the first rotating shaft, the second rotating shaft and the third rotating shaft share a central axis, wherein a surface-mounted permanent magnet rotor and a magnetic adjustment unit (9) are arranged between the first rotating shaft and the second rotating shaft, and the surface-mounted permanent magnet rotor is sleeved on the first rotating shaft, and an embedded permanent magnet rotor is arranged between the second rotating shaft and the third rotating shaft, and a first magnetic adjustment ring (10) and a second magnetic adjustment ring (5) are arranged on the embedded permanent magnet rotor.

2. The magnetic gear composite permanent magnet motor with multiple rotors and magnetic adjustment rings according to claim 1 is characterized in that: The permanent magnet rotor (7) is composed of a rotor iron core.

3. The magnetic gear composite permanent magnet motor with multiple rotors and magnetic adjustment rings according to claim 1 is characterized in that: The magnetic adjustment unit (9) is integrally mounted circumferentially on the surface-mounted permanent magnet rotor.

4. The magnetic gear composite permanent magnet motor with multiple rotors and magnetic adjustment rings according to claim 1 is characterized in that: The first magnetic adjustment ring (10) and the second magnetic adjustment ring (5) are of a half-crescent-shaped structure.

5. The magnetic gear composite permanent magnet motor with multiple rotors and magnetic adjustment rings according to claim 1 is characterized in that: The magnetic modulation unit (9) is mounted on the rotor yoke (8).

6. The magnetic gear composite permanent magnet motor with multiple rotors and magnetic adjustment rings according to claim 1, characterized in that: A tail cover (1) is provided at the rear end of the motor.

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