A new type of permanent magnet synchronous motor

Abstract

The present invention discloses a novel permanent magnet synchronous motor, comprising a central rotating shaft; an inner ring permanent magnet device for generating a magnetic field; an outer ring permanent magnet device for generating a magnetic field; a stator device for generating an electromagnetic field; a housing, comprising a shell portion and a flux regulating portion; a flux regulating device, comprising a spiral positioning member, a flux regulating paddle, and an intermediate connecting member for converting the axial displacement of the flux regulating paddle into the circumferential rotation of the spiral positioning member, wherein the flux regulating paddle can move axially along the axis of the central rotating shaft. The spiral positioning member drives the outer ring permanent magnet device to rotate. The present invention adopts a novel rotor structure and control technology to adjust the effective magnetic field strength of the rotor, thereby expanding the torque and speed range of the permanent magnet synchronous motor.

Description

Technical Field

[0001] The invention relates to the field of machinery, and in particular to a novel permanent magnet synchronous motor. Background Art

[0002] With the development of clean energy electric vehicles, permanent magnet synchronous motors and brushless DC motors are gaining more and more attention due to their high efficiency, high power density, and light weight. The available speed range of permanent magnet synchronous motors is much lower than that of asynchronous motors with the same power and pole number. However, asynchronous motors have the disadvantages of low power density and low efficiency, which makes it difficult to meet the requirements of high-performance electric vehicles. At present, the research on the flux control of permanent magnet synchronous motors at home and abroad mainly focuses on reluctance control, additional excitation winding control, and the installation of moving mechanical elements on the rotor. However, there are some shortcomings in the above schemes, such as the continuous improvement of motor efficiency and the vibration and noise caused by the imbalance of the rotor structure. Studies have shown that although the conical rotor permanent magnet synchronous motor provides a solution for adjusting the flux, it is not suitable for high-efficiency gearbox-free outer rotor direct drive motors. In addition, the stator coils and iron cores proposed by the institute are difficult to mechanize and can only achieve a reduction in high-speed flux, but cannot improve the efficiency of the entire speed range. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a novel permanent magnet synchronous motor, which changes the magnetic flux by changing the angle of the magnetic field, thereby changing the torque and speed of the permanent magnet synchronous motor. The present invention adopts a novel rotor structure to adjust the effective magnetic field strength, thereby expanding the torque and speed range of the permanent magnet synchronous motor.

[0004] The present invention proposes a new type of permanent magnet synchronous motor with the above functions. It includes: a central rotating shaft; an inner ring permanent magnet device for generating a magnetic field, the inner ring permanent magnet device is sleeved on the central rotating shaft; an outer ring permanent magnet device for generating a magnetic field, the outer ring permanent magnet device is sleeved on the inner ring permanent magnet device; a stator device for generating an electromagnetic field, the stator device is sleeved on the outer ring permanent magnet device; a shell, including a shell part and a flux regulating part, the shell part is provided with an inner cavity for placing the stator device; the flux regulating device includes a spiral positioning member for driving the outer ring permanent magnet device to rotate, a flux regulating paddle for adjusting the magnetic flux, and a magnetic flux regulating paddle for adjusting the magnetic flux. An intermediate connecting piece that converts axial displacement into circumferential rotation of the spiral positioning piece, one end of the spiral positioning piece is connected to the outer ring permanent magnet device, the spiral positioning piece is provided with an oblique groove, the magnetic flux adjustment paddle and the intermediate connecting piece are sleeved on the central rotating shaft and are located in the magnetic flux adjustment part, one end of the intermediate connecting piece is connected to the magnetic flux adjustment paddle, and the other end is provided with a protrusion, the protrusion is placed on the oblique groove, the magnetic flux adjustment paddle can move axially along the axis of the central rotating shaft, the magnetic flux adjustment paddle is provided with a through hole, and a bearing sleeved on the central rotating shaft is provided in the through hole.

[0005] The novel permanent magnet synchronous motor according to the embodiment of the present invention has at least the following technical effects: when the flux regulating paddle moves axially along the axis of the central shaft, it will drive the intermediate connecting member to move axially, and the protrusion on the intermediate connecting member will apply pressure to the inner wall of the inclined groove during the axial movement, thereby pushing the spiral positioning member to rotate, and the spiral positioning member drives the outer ring permanent magnet device to rotate, thereby changing the angle between the inner ring permanent magnet device and the outer ring permanent magnet device. The present invention adopts a novel rotor structure and control method to adjust the effective magnetic field strength of the rotor, expanding the torque and speed range of the permanent magnet synchronous motor.

[0006] According to the novel permanent magnet synchronous motor of the embodiment of the present invention, the inner ring permanent magnet device includes an inner ring permanent magnet and an inner ring silicon steel sheet for fixing the inner ring permanent magnet, and the inner ring permanent magnet is installed in the inner ring silicon steel sheet. The number of the inner ring permanent magnets can be flexibly adjusted according to the actual production environment, and the inner ring silicon steel sheet is mainly used to fix the inner ring permanent magnet and conduct magnetism.

[0007] According to the novel permanent magnet synchronous motor of the embodiment of the present invention, the outer ring permanent magnet device comprises an outer ring permanent magnet and an outer ring silicon steel sheet for fixing the outer ring permanent magnet, and the outer ring permanent magnet is installed in the outer ring silicon steel sheet. The number of the outer ring permanent magnets can be flexibly adjusted according to the actual production environment, and the outer ring silicon steel sheet is mainly used to fix the outer ring permanent magnet and conduct magnetism.

[0008] According to the novel permanent magnet synchronous motor of the embodiment of the present invention, the inner ring permanent magnet device further comprises a rotor end cover for longitudinally fixing the inner ring permanent magnet device and the central rotating shaft. The rotor end cover prevents the inner ring permanent magnet device and the central rotating shaft from axial displacement, thereby ensuring the stability of the structure of the inner ring permanent magnet device. The inner ring permanent magnet device rotates around the central rotating shaft under the action of the magnetic field force without axial displacement.

[0009] According to the novel permanent magnet synchronous motor of the embodiment of the present invention, the stator device comprises an outer ring stator and an outer ring coil, and the outer ring coil is wound on the outer ring stator. During operation, a time-varying current is passed through the outer ring coil to generate a time-varying electric field, and the stator device is used to fix the outer ring coil and transmit the time-varying electromagnetic field.

[0010] According to the novel permanent magnet synchronous motor of the embodiment of the present invention, the housing portion is provided with an opening, and the opening is provided with a plurality of screw mounting holes, through which the installer can install screws to adjust the tightness of the outer ring permanent magnet device and the inner ring permanent magnet device.

[0011] According to the novel permanent magnet synchronous motor of the embodiment of the present invention, the housing is further provided with a mounting portion for fixing the motor, and the mounting portion is provided with a plurality of mounting holes, through which the installer can install screws, and the bottom of the housing will be fixed to the workbench where the motor is located.

[0012] The novel permanent magnet synchronous motor according to the embodiment of the present invention further includes a controller, which is used to control the outer coil to be energized. The controller can generate a time-varying current to energize the outer coil, and the controller is also used to control the displacement of the magnetic flux regulating device.

[0013] Additional aspects and advantages 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

[0014] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0015] Figure 1 It is a front schematic diagram of a novel permanent magnet synchronous motor according to an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of an axial decomposition of a novel permanent magnet synchronous motor according to an embodiment of the present invention;

[0017] Figure 3 It is an exploded schematic diagram of a novel permanent magnet synchronous motor flux regulating device according to an embodiment of the present invention;

[0018] Figure 4 A schematic diagram of the back side of a housing of a novel permanent magnet synchronous motor according to an embodiment of the present invention;

[0019] Reference numerals:

[0020] Central shaft 100,

[0021] Inner ring permanent magnet device 200, inner ring permanent magnet 201, inner ring silicon steel sheet 202, rotor end cover 203, outer ring permanent magnet device 300, outer ring permanent magnet 301, outer ring silicon steel sheet 302,

[0022] stator device 400, outer ring stator 401, outer ring coil 402,

[0023] Shell 500, housing portion 501, inner cavity 502, opening 503, screw mounting hole 504, mounting portion 505, mounting hole 506, magnetic flux adjustment portion 507,

[0024] Magnetic flux regulating device 600 , spiral positioning member 601 , inclined slot 602 , magnetic flux regulating paddle 603 , through hole 604 , bearing 605 , intermediate connecting member 606 , and protrusion 607 . DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0028] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0029] Reference Figure 1-3 , describes a new type of permanent magnet synchronous motor according to an embodiment of the present invention. It includes: a central rotating shaft 100; an inner ring permanent magnet device 200, used to generate a magnetic field, the inner ring permanent magnet device 200 is sleeved on the central rotating shaft 100; an outer ring permanent magnet device 300, used to generate a magnetic field, the outer ring permanent magnet device 300 is sleeved on the inner ring permanent magnet device 200; a stator device 400, used to generate an electromagnetic field, the stator device 400 is sleeved on the outer ring permanent magnet device 300; a shell 500, including a shell part 501 and a flux regulating part 507, the shell part 501 is provided with an inner cavity 502 for placing the stator device 400; a flux regulating device 600, including a spiral positioning member 601 for driving the outer ring permanent magnet device 300 to rotate, a flux regulating paddle 603 for adjusting the magnetic flux, and an axial direction for adjusting the flux regulating paddle 603. The displacement is converted into an intermediate connecting member 606 for circumferential rotation of the spiral positioning member 601. One end of the spiral positioning member 601 is connected to the outer ring permanent magnet device 300. The spiral positioning member 601 is provided with an inclined groove 602. The magnetic flux regulating paddle 603 and the intermediate connecting member 606 are sleeved on the central rotating shaft 100 and are located at the magnetic flux regulating portion 507. One end of the intermediate connecting member 606 is connected to the magnetic flux regulating paddle 603, and the other end is provided with a protrusion 607. The protrusion 607 is placed on the inclined groove 602. The magnetic flux regulating paddle 603 can move axially along the axis of the central rotating shaft 100. The magnetic flux regulating paddle 603 is provided with a through hole 604, and the through hole 604 is provided with a bearing 605 sleeved on the central rotating shaft 100. The present invention has at least the following technical effects: when the magnetic flux adjustment paddle 603 moves axially along the axis of the central shaft 100, it will drive the intermediate connector 606 to move axially, and the protrusion 607 on the intermediate connector 606 will apply pressure to the inner wall of the inclined slot 602 during the axial movement, thereby pushing the spiral positioning member 601 to rotate, and the spiral positioning member 601 drives the outer ring permanent magnet device 300 to rotate, thereby changing the angle between the inner ring permanent magnet device 200 and the outer ring permanent magnet device 300. The present invention adopts a new rotor structure and control method to adjust the effective magnetic field strength of the rotor to expand the torque and speed adjustment range of the permanent magnet synchronous motor.

[0030] Reference Figure 2According to the novel permanent magnet synchronous motor of the embodiment of the present invention, the inner ring permanent magnet device 200 includes an inner ring permanent magnet 201 and an inner ring silicon steel sheet 202 for fixing the inner ring permanent magnet 201, and the inner ring permanent magnet 201 is installed in the inner ring silicon steel sheet 202. The number of the inner ring permanent magnets 201 can be flexibly adjusted according to the actual production environment, and the inner ring silicon steel sheet 2020 is mainly used to fix the inner ring permanent magnet 201 and conduct magnetism.

[0031] Reference Figure 2 According to the novel permanent magnet synchronous motor of the embodiment of the present invention, the outer ring permanent magnet device 300 includes an outer ring permanent magnet 301 and an outer ring silicon steel sheet 302 for fixing the outer ring permanent magnet 301, and the outer ring permanent magnet 301 is installed in the outer ring silicon steel sheet 302. The number of the outer ring permanent magnets 301 can be flexibly adjusted according to the actual production environment, and the outer ring silicon steel sheet 302 is mainly used to fix the outer ring permanent magnet 301 and conduct magnetism.

[0032] Reference Figure 1 and Figure 2 According to the novel permanent magnet synchronous motor of the embodiment of the present invention, the inner ring permanent magnet device 200 further includes a rotor end cover 203 for longitudinally fixing the inner ring permanent magnet device 200 and the central rotating shaft 100. The rotor end cover 203 prevents the inner ring permanent magnet device 200 and the central rotating shaft 100 from axial displacement, thereby ensuring the structural stability of the inner ring permanent magnet device 200. The inner ring permanent magnet device 200 rotates around the central rotating shaft 100 under the action of the magnetic field force without axial displacement.

[0033] Reference Figure 1 and Figure 2 According to the novel permanent magnet synchronous motor of the embodiment of the present invention, the stator device 400 includes an outer ring stator 401 and an outer ring coil 402, and the outer ring coil 402 is wound on the outer ring stator 401. During operation, the outer ring coil 402 is passed through a time-varying current to generate a time-varying electromagnetic field, and the stator device 400 is used to fix the outer ring coil 402 and transmit the time-varying electromagnetic field.

[0034] Reference Figure 1 and Figure 2 According to the novel permanent magnet synchronous motor of the embodiment of the present invention, the housing portion 501 is provided with an opening 503, and the opening 503 is provided with a plurality of screw mounting holes 504. The installer can install screws through the screw mounting holes 504 to adjust the tightness of the outer ring permanent magnet device 300 and the inner ring permanent magnet device 200.

[0035] Reference Figure 1 and Figure 2According to the novel permanent magnet synchronous motor of the embodiment of the present invention, the housing portion 501 is further provided with a mounting portion 505 for fixing the motor, and the mounting portion is provided with a plurality of mounting holes 506. The installer can install screws through the mounting holes 506, and the bottom of the housing 500 will be fixed to the workbench where the motor is located.

[0036] Reference Figure 1-4 The novel permanent magnet synchronous motor according to the embodiment of the present invention further includes a controller, which is used to control the power supply of the outer coil. The controller can generate a time-varying current to power the outer coil, and the controller is also used to control the displacement of the magnetic flux regulating device.

[0037] It should be noted that, in the novel permanent magnet synchronous motor of each embodiment of the present invention, the controller may be a control system commonly used in the field of industrial control and composed of a PLC chip, a microprocessor such as STM32, an FPGA chip, a DSP chip, etc. This belongs to the prior art, and its specific structure will not be described in detail here.

[0038] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

[0039] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0040] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A new type of permanent magnet synchronous motor, characterized in that: include: Central axis; An inner ring permanent magnet device, used for generating a magnetic field, wherein the inner ring permanent magnet device is sleeved on the central rotating shaft; An outer ring permanent magnet device, used for generating a magnetic field, wherein the outer ring permanent magnet device is sleeved on the inner ring permanent magnet device; A stator device, used for generating an electromagnetic field, wherein the stator device is sleeved on the outer ring permanent magnet device; A housing, comprising a housing portion and a magnetic flux regulating portion, wherein the housing portion is provided with an inner cavity for placing the stator device and a mounting portion for fixing the motor; A magnetic flux regulating device comprises a spiral positioning member for driving the outer ring permanent magnet device to rotate, a magnetic flux regulating paddle for regulating magnetic flux, and an intermediate connecting member for converting the axial displacement of the magnetic flux regulating paddle into the circumferential rotation of the spiral positioning member, one end of the spiral positioning member is connected to the outer ring permanent magnet device, an inclined groove is provided on the spiral positioning member, the magnetic flux regulating paddle and the intermediate connecting member are sleeved on the central rotating shaft and are located at the magnetic flux regulating portion, one end of the intermediate connecting member is connected to the magnetic flux regulating paddle, and the other end is provided with a protrusion, the protrusion is placed on the inclined groove, the magnetic flux regulating paddle can move axially along the axis of the central rotating shaft, the magnetic flux regulating paddle is provided with a through hole, and a bearing sleeved on the central rotating shaft is provided in the through hole.

2. The novel permanent magnet synchronous motor according to claim 1 is characterized in that: The inner ring permanent magnet device comprises an inner ring permanent magnet and an inner ring silicon steel sheet for fixing the inner ring permanent magnet, and the inner ring permanent magnet is installed in the inner ring silicon steel sheet.

3. The novel permanent magnet synchronous motor according to claim 1 is characterized in that: The outer ring permanent magnet device comprises an outer ring permanent magnet and an outer ring silicon steel sheet for fixing the outer ring permanent magnet, and the outer ring permanent magnet is installed in the outer ring silicon steel sheet.

4. The novel permanent magnet synchronous motor according to claim 1 is characterized in that: The inner ring permanent magnet device also includes a rotor end cover for longitudinally fixing the inner ring permanent magnet device and the central rotating shaft.

5. The novel permanent magnet synchronous motor according to claim 1 is characterized in that: The stator device comprises an outer ring stator and an outer ring coil, wherein the outer ring coil is wound on the outer ring stator.

6. The novel permanent magnet synchronous motor according to claim 1 is characterized in that: The shell part is provided with an opening, and the opening is provided with a plurality of screw mounting holes.

7. The novel permanent magnet synchronous motor according to claim 5 is characterized in that: A controller is also included, and the controller is used to control the power supply of the outer coil.

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