A rotor motor drive system

Abstract

The embodiment of the application discloses a rotor motor driving system, and the rotor motor driving system provided by the embodiment of the application comprises a driving motor and a hybrid rotor, the hybrid rotor is arranged on a rotating shaft of the driving motor, the hybrid rotor has a first section and a second section, the second section has four first magnetic poles, each first magnetic pole has two V-shaped magnetic parts and a U-shaped magnetic part.In the technical solution, the tangential magnetic field generated by the V-shaped magnetic part and the radial magnetic field of the U-shaped magnetic part are superposed, so that the air gap magnetic density waveform is closer to a sine, compared with a traditional scheme in which only the V-shaped magnetic part is used, the technical solution can effectively reduce torque ripple.Meanwhile, the U-shaped magnetic part forms a closed magnetic circuit, cooperates with the open magnetic circuit of the V-shaped magnetic part, and can improve the magnetic flux utilization rate.Furthermore, the U-shaped magnetic steel and the V-shaped magnetic steel can form a multi-stage mechanical structure, and can reduce the centrifugal stress when the hybrid rotor rotates at high speed.

Description

Technical Field

[0001] This application relates to the field of permanent magnet synchronous motor technology, and more particularly to a rotor motor drive system. Background Technology

[0002] Permanent magnet synchronous motors (PMSMs) offer advantages such as high torque density, high power factor, and high efficiency. However, the large number of magnets mounted on the rotor contributes to their high cost. Synchronous reluctance motors (SRRMs), on the other hand, offer advantages such as simple rotor structure and low cost, but suffer from a lower power factor. Common first pole arrangements for existing PMSM rotors include straight-line and V-shaped configurations. While these configurations are simple, torque can often be improved by optimizing the rotor magnet parameters. However, the torque optimization potential for existing straight-line and V-shaped first pole arrangements is limited by the constraints of the first pole arrangement. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0004] Therefore, this utility model provides a rotor motor drive system, including: a drive motor, wherein one side of the drive motor has a rotating shaft;

[0005] A hybrid rotor, wherein the hybrid rotor is disposed on the rotating shaft;

[0006] The hybrid rotor has a first section and a second section, the second section having four first magnetic poles, each of the first magnetic poles having two V-shaped magnetic parts and two U-shaped magnetic parts.

[0007] In one feasible implementation, the first section is fixed to the rotating shaft, and the first section is a synchronous magnetic reluctance rotor;

[0008] The second section is fixed to the rotating shaft, and the second section is a permanent magnet rotor.

[0009] In one feasible implementation, the second segment includes:

[0010] A permanent magnet rotor core is disposed on the rotating shaft. The permanent magnet rotor core is divided into four first magnetic poles, and each first magnetic pole includes two V-shaped magnetic parts and one U-shaped magnetic part.

[0011] The magnetic steel groove is formed in the permanent magnet rotor core, and the V-shaped magnetic part and the U-shaped magnetic part are both arranged inside the magnetic steel groove.

[0012] In one feasible implementation, the two V-shaped magnetic parts of each first magnetic pole are symmetrically arranged on both sides of the circumference of the U-shaped magnetic part;

[0013] The side of the V-shaped magnetic part away from the U-shaped magnetic part is side A, and the side of the V-shaped magnetic part closer to the U-shaped magnetic part is side B. The radial length of side A of the V-shaped magnetic part is greater than that of side B.

[0014] The outer radial end of the V-shaped magnet A side and the outer radial end of the U-shaped magnet are located on the same circumference.

[0015] In one feasible implementation, the first magnetic pole further includes:

[0016] A straight magnetic section is disposed inside the U-shaped magnetic section and inside the magnetic groove.

[0017] In one feasible implementation, the first segment includes:

[0018] A synchronous reluctance rotor core, wherein the synchronous reluctance rotor core is disposed on the rotating shaft;

[0019] The magnetic barrier is formed in the synchronous reluctance rotor core. The first section is divided into four second magnetic poles, and the magnetic barriers in each second magnetic pole are arranged in the same way.

[0020] In one feasible implementation, the included angle of the V-shaped magnetic part is θ1, and the included angle of the U-shaped magnetic part is θ2, then 0.55 < θ1 / θ2 < 0.64.

[0021] In one feasible implementation, it further includes:

[0022] Mounting housing, the mounting housing being disposed on the side of the drive motor having a rotating shaft;

[0023] A control component is disposed inside the mounting housing.

[0024] In one feasible implementation, the mounting housing includes:

[0025] A first housing is bolted to the drive motor;

[0026] The second housing is bolted to the first housing;

[0027] The first housing, the second housing, and the mounting end of the drive motor together form a cavity, and the control component is disposed inside the cavity.

[0028] In one feasible implementation, the control component includes:

[0029] The detection device is disposed inside the first housing;

[0030] A controller, which is electrically connected to the detection device.

[0031] Compared with existing technologies, this utility model has at least the following beneficial effects: The rotor motor drive system provided in this application includes a drive motor and a hybrid rotor. The hybrid rotor is mounted on the shaft of the drive motor and has a first section and a second section. The second section has four first magnetic poles, each of which has two V-shaped magnetic parts and one U-shaped magnetic part. In this technical solution, the tangential magnetic field generated by the V-shaped magnetic parts is superimposed with the radial magnetic field of the U-shaped magnetic parts, making the air gap magnetic flux density waveform closer to a sine wave. Compared with the traditional solution that uses only V-shaped magnetic parts, this technical solution can effectively reduce torque pulsation. At the same time, the U-shaped magnetic parts form a closed magnetic circuit, which, combined with the open magnetic circuit of the V-shaped magnetic parts, can improve the magnetic flux utilization rate. Furthermore, the U-shaped magnets and V-shaped magnets can form a multi-level mechanical structure, which can reduce the centrifugal stress when the hybrid rotor rotates at high speed. Attached Figure Description

[0032] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0033] Figure 1 A schematic diagram of the structure of a rotor motor drive system according to an embodiment of this application;

[0034] Figure 2 A schematic diagram of the structure of a hybrid rotor according to an embodiment of this application;

[0035] Figure 3 A structural block diagram of the first segment of an embodiment provided in this application;

[0036] Figure 4 A structural block diagram of the second segment of an embodiment provided in this application;

[0037] Figure 5 A structural block diagram of the first magnetic pole of one embodiment provided in this application.

[0038] in, Figure 1-5 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0039] 100. Drive motor; 200. Mounting housing; 300. Hybrid rotor; 400. Shaft;

[0040] 210. First shell; 220. Second shell;

[0041] 310. First section; 320. Second section;

[0042] 311. Synchronous reluctance rotor core; 312. Magnetic barrier;

[0043] 321. Permanent magnet rotor core; 322. Magnet slot; 323. V-shaped magnetic section; 324. U-shaped magnetic section; 325. Straight magnetic section. Detailed Implementation

[0044] To better understand the above technical solutions, the technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0045] like Figure 1-5 As shown, a drive motor 100 has a rotating shaft 400 on one side; a hybrid rotor 300 is disposed on the rotating shaft 400; the hybrid rotor 300 has a first section 310 and a second section 320, the second section 320 has four first magnetic poles, each of the first magnetic poles has two V-shaped magnetic parts 323 and one U-shaped magnetic part 324.

[0046] The rotor motor drive system provided in this application includes a drive motor 100 and a hybrid rotor 300. The hybrid rotor 300 is mounted on the shaft 400 of the drive motor 100. The hybrid rotor 300 has a first section 310 and a second section 320. The second section 320 has four first magnetic poles, each of which has two V-shaped magnetic parts 323 and one U-shaped magnetic part 324. In this technical solution, the tangential magnetic field generated by the V-shaped magnetic part 323 is superimposed with the radial magnetic field of the U-shaped magnetic part 324, making the air gap magnetic flux density waveform closer to a sine wave. Compared with the traditional solution that uses the V-shaped magnetic part 323 alone, this technical solution can effectively reduce torque pulsation. At the same time, the U-shaped magnetic part 324 forms a closed magnetic circuit, which, combined with the open magnetic circuit of the V-shaped magnetic part 323, can improve the magnetic flux utilization rate. Furthermore, the U-shaped magnets and V-shaped magnets can form a multi-level mechanical structure, which can reduce the centrifugal stress when the hybrid rotor 300 rotates at high speed.

[0047] like Figure 1-5 As shown, the first section 310 is fixed to the rotating shaft 400, and the first section 310 is a synchronous magnetic reluctance rotor; the second section 320 is fixed to the rotating shaft 400, and the second section 320 is a permanent magnet rotor.

[0048] In this technical solution, the first section 310 is a synchronous magnetic reluctance rotor, which is used to generate reluctance torque through the difference in induction between the quadrature and direct axes, thereby expanding the speed regulation range of the field weakening. The second section 320 is a permanent magnet rotor, which provides the basic excitation magnetic field. The first section 310 and the second section 320 work together to increase the speed regulation range by more than 30%.

[0049] like Figure 1-5 As shown, the second section 320 includes: a permanent magnet rotor core 321, which is disposed on the rotating shaft 400. The permanent magnet rotor core 321 is divided into four first magnetic poles, each of which includes two V-shaped magnetic parts 323 and one U-shaped magnetic part 324; and a magnetic steel groove 322, which is formed in the permanent magnet rotor core 321. The V-shaped magnetic parts 323 and the U-shaped magnetic parts 324 are both disposed inside the magnetic steel groove 322.

[0050] In this technical solution, the permanent magnet rotor core 321 is disposed on the rotating shaft 400 and is divided into four first magnetic poles. The four first magnetic poles are evenly distributed along the circumference of the permanent magnet rotor core 321, and the magnetic distribution on each first magnetic pole is the same, forming four 90° symmetrical magnetic fields. This can effectively cancel the second or fourth harmonic torque, further reduce torque pulsation, and ensure that the magnetic field strength of each pole is consistent, thus avoiding torque fluctuations caused by magnetic flux asymmetry.

[0051] like Figure 1-5 As shown, the two V-shaped magnetic parts 323 of each first magnetic pole are symmetrically arranged on both sides of the circumference of the U-shaped magnetic part 324; the side of the V-shaped magnetic part 323 away from the U-shaped magnetic part 324 is side A, and the side of the V-shaped magnetic part 323 closer to the U-shaped magnetic part 324 is side B. The radial length of side A of the V-shaped magnetic part 323 is greater than that of side B. The radial outer end of side A of the V-shaped magnetic part 323 and the radial outer end of the U-shaped magnetic part 324 are located on the same circumference.

[0052] In this technical solution, two V-shaped magnetic sections 323 are symmetrically arranged on both sides of a U-shaped magnetic section 324. Each V-shaped magnetic section 323 consists of two bar magnetic sections. Let the end of the two bar magnetic sections that is close together be end a, then end a of the V-shaped magnetic section 323 lies on the same circumference. Let the end of the two bar magnetic sections that is far apart be end b, then end b of the bar magnetic section farther from the U-shaped magnetic section 324 lies on the same circumference as both ends of the U-shaped magnetic section 324. Let the radius of this circumference be a1. End b of the bar magnetic section closer to the U-shaped magnetic section 324 lies on another circumference, let the radius of this circumference be a2, where a1 > a2. In this arrangement, the first magnetic pole is symmetrical along the d-axis (the reference axis of the rotor magnetic field direction), enhancing the deformation resistance of the hybrid rotor 300 in the d-axis direction. The U-shaped magnetic section 324 is positioned in the middle of the first magnetic pole, which can increase the magnetic flux density amplitude in the middle segment of the magnetic flux density waveform generated by the magnetic pole. Furthermore, placing V-shaped magnetic sections 323 on both sides of the U-shaped magnetic section 324 can improve the space utilization of the permanent magnet rotor core 321, thereby increasing the magnetic flux generated by each magnetic pole. At the same time, the double circumferential radius design of a1 and a2 makes the centrifugal stress distribution more uniform, which can improve the critical speed, and the oblique arrangement of the V-shaped magnetic section 323 can also effectively enhance the axial stiffness of the rotor.

[0053] like Figure 1-5 As shown, the first magnetic pole further includes a straight magnetic part 325, which is disposed inside the U-shaped magnetic part 324 and inside the magnetic groove 322.

[0054] In this technical solution, the first magnetic pole also includes a line-shaped magnetic section 325, which can further increase the magnetic flux amplitude of the middle segment of the magnetic flux waveform generated by each magnetic pole.

[0055] like Figure 1-5 As shown, the first section 310 includes: a synchronous reluctance rotor core 311, which is disposed on the rotating shaft 400; and a magnetic barrier 312, which is formed on the synchronous reluctance rotor core 311. The first section 310 is divided into four second magnetic poles, and the magnetic barriers 312 in each second magnetic pole are arranged in the same way.

[0056] In this technical solution, the number of the second magnetic poles is the same as that of the first magnetic poles, which is four. This setting can ensure that the magnetic field cycles of the rotors of the first section 310 and the second section 320 are completely synchronized, avoiding magnetic circuit coupling losses caused by the difference in the number of poles.

[0057] like Figure 1-5 As shown, the included angle of the V-shaped magnetic part 323 is θ1, and the included angle of the U-shaped magnetic part 324 is θ2, then 0.55 < θ1 / θ2 < 0.64.

[0058] In this technical solution, by optimizing the values ​​of θ1 / θ2, the magnetic flux density waveform generated by each magnetic pole can be optimized, thereby affecting the motor torque and magnetic flux density harmonics.

[0059] like Figure 1-5 As shown, it also includes: a mounting housing 200, which is disposed on the side of the drive motor 100 having a rotating shaft 400; and a control component, which is disposed inside the mounting housing 200.

[0060] In this technical solution, the rotor motor drive system also includes a mounting housing 200 and a control component. The mounting housing 200 is located at the end of the drive motor 100 where the shaft 400 is located, and the control component is located inside the mounting housing 200. In this configuration, by integrating the drive motor 100 and the control component through the mounting housing 200, the structure of the rotor motor becomes more compact.

[0061] like Figure 1-5 As shown, the mounting housing 200 includes: a first housing 210, which is bolted to the drive motor 100; and a second housing 220, which is bolted to the first housing 210. The first housing 210, the second housing 220, and the mounting end of the drive motor 100 form a cavity, and the control component is disposed inside the cavity.

[0062] In this technical solution, the mounting housing 200 is divided into two housings, which facilitates the production of the mounting housing 200 and reduces the difficulty of mold making.

[0063] like Figure 1-5 As shown, the control component includes: a detection device disposed inside the first housing 210; and a controller electrically connected to the detection device.

[0064] In this technical solution, the mounting housing 200 is divided into a detection device and a controller. The detection device is used to detect the operation of the controller and the hybrid rotor 300. When a fault occurs, the detection device can issue an alarm in time, which improves the motor's response speed to faults.

[0065] In this utility model, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "join," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "join" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0066] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0067] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0068] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rotor motor drive system, characterized in that, include: A drive motor, wherein one side of the drive motor has a rotating shaft; A hybrid rotor, wherein the hybrid rotor is disposed on the rotating shaft; The hybrid rotor has a first section and a second section, the second section having four first magnetic poles, each of the first magnetic poles having two V-shaped magnetic parts and one U-shaped magnetic part.

2. The rotor motor drive system according to claim 1, characterized in that: The first section is fixed to the rotating shaft, and the first section is a synchronous magnetic reluctance rotor; The second section is fixed to the rotating shaft, and the second section is a permanent magnet rotor.

3. The rotor motor drive system according to claim 1, characterized in that, The second section includes: A permanent magnet rotor core is disposed on the rotating shaft. The permanent magnet rotor core is divided into four first magnetic poles, and each first magnetic pole includes two V-shaped magnetic parts and one U-shaped magnetic part. The magnetic steel groove is formed in the permanent magnet rotor core, and the V-shaped magnetic part and the U-shaped magnetic part are both arranged inside the magnetic steel groove.

4. The rotor motor drive system according to claim 1, characterized in that: The two V-shaped magnetic parts of each first magnetic pole are symmetrically arranged on both sides of the circumference of the U-shaped magnetic part; The side of the V-shaped magnetic part away from the U-shaped magnetic part is side A, and the side of the V-shaped magnetic part closer to the U-shaped magnetic part is side B. The radial length of side A of the V-shaped magnetic part is greater than that of side B. The outer radial end of the V-shaped magnet A side and the outer radial end of the U-shaped magnet are located on the same circumference.

5. The rotor motor drive system according to claim 3, characterized in that, The first magnetic pole also includes: A straight magnetic section is disposed inside the U-shaped magnetic section and inside the magnetic groove.

6. The rotor motor drive system according to claim 1, characterized in that, The first segment includes: A synchronous reluctance rotor core, wherein the synchronous reluctance rotor core is disposed on the rotating shaft; The magnetic barrier is formed in the synchronous reluctance rotor core. The first section is divided into four second magnetic poles, and the magnetic barriers in each second magnetic pole are arranged in the same way.

7. The rotor motor drive system according to claim 6, characterized in that: The included angle of the V-shaped magnetic part is θ1, and the included angle of the U-shaped magnetic part is θ2, then 0.55 < θ1 / θ2 < 0.

64.

8. The rotor motor drive system according to claim 1, characterized in that, Also includes: Mounting housing, the mounting housing being disposed on the side of the drive motor having a rotating shaft; A control component is disposed inside the mounting housing.

9. The rotor motor drive system according to claim 8, characterized in that, The mounting housing includes: A first housing is bolted to the drive motor; The second housing is bolted to the first housing; The first housing, the second housing, and the mounting end of the drive motor together form a cavity, and the control component is disposed inside the cavity.

10. The rotor motor drive system according to claim 9, characterized in that, The control component includes: The detection device is disposed inside the first housing; A controller, which is electrically connected to the detection device.

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