Permanent magnet synchronous motor

Abstract

The utility model discloses a permanent magnet synchronous motor which is characterized in that a plurality of first grooves are designed on the outer circle of a stator core, a plurality of stator winding grooves are arranged on the inner wall of the stator core, a plurality of stator teeth are arranged between adjacent stator winding grooves, and the plurality of stator teeth surround to form a circular through hole; the rotor iron core is located in the circular through hole, a plurality of second grooves are designed in the outer circle of the rotor iron core, the center lines of notches of the adjacent second grooves form an included angle along the outer circle of the rotor iron core, and the included angle ranges from 15 degrees to 30 degrees. A plurality of first grooves are designed in the outer circle of a stator core, a plurality of second grooves are designed in the outer circle of a rotor core, and the first grooves and the second grooves are matched together, so that the harmonic distortion rate of an air gap flux density waveform and the harmonic distortion rate of a linear counter electromotive force waveform generated during operation of the permanent magnet synchronous motor are reduced, and the operation efficiency of the permanent magnet synchronous motor is improved; and electromagnetic noise and vibration generated in the operation process of the permanent magnet synchronous motor are reduced.

Description

Technical Field

[0001] The utility model relates to, but is not limited to, the field of motor manufacturing, and in particular to a permanent magnet synchronous motor. Background Art

[0002] Permanent magnet synchronous motors (PMSMs) are widely used due to their significant advantages, such as high efficiency, energy saving, and high power density. The rotor of a PMSM is embedded with magnets (rare earth magnetic materials), which form the magnetic poles. Existing PMSMs generate air gap flux waveforms with harmonic distortion rates exceeding 10% and line back EMF waveforms with harmonic distortion rates exceeding 3%. These harmonics contain a large number of harmonics that affect motor performance. These harmonics reduce the operating efficiency of PMSMs and exacerbate their vibration and electromagnetic noise. Utility Model Content

[0003] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0004] The embodiment of the utility model provides a permanent magnet synchronous motor, which can improve the service life, efficiency and stability of the motor.

[0005] The present invention provides a permanent magnet synchronous motor, comprising: a stator core, wherein the outer circumference of the stator core is designed with a plurality of first grooves, the inner wall of the stator core is provided with a plurality of stator winding slots, a plurality of stator teeth are provided between adjacent stator winding slots, and the plurality of stator teeth surround and form a circular through hole;

[0006] The rotor core is located in the circular through hole, and the outer circle of the rotor core is designed with multiple second grooves. The center lines of the slots of adjacent second grooves form an angle along the outer circle of the rotor core, and the degree range of the angle is 15° to 30°.

[0007] According to some embodiments of the present invention, the diameter of the second groove ranges from 2 mm to 8 mm.

[0008] According to some embodiments of the present invention, the stator teeth are provided with slot wedges at the stator winding slots for fixing the windings.

[0009] According to some embodiments of the present invention, the winding is a double-layer winding.

[0010] According to some embodiments of the present invention, an insulating layer is further provided between the winding and the stator winding slot.

[0011] According to some embodiments of the present invention, the first groove is used for laser welding.

[0012] The permanent magnet motor according to the embodiment of the present invention has at least the following beneficial effects: the stator core, the outer circle of the stator core is designed with multiple first grooves, the inner wall of the stator core is provided with multiple stator winding slots, multiple stator teeth are provided between adjacent stator winding slots, and the multiple stator teeth are surrounded to form a circular through hole; the rotor core, the rotor core is located in the circular through hole, the outer circle of the rotor core is designed with multiple second grooves, the center lines of the slots of adjacent second grooves form an angle along the outer circle of the rotor core, and the degree range of the angle is 15° to 30°. According to the technical solution of the present invention, a plurality of first grooves are designed on the outer circle of the stator core to reduce the harmonic distortion rate of the air gap magnetic flux waveform and the harmonic distortion rate of the line back electromotive force waveform generated when the permanent magnet synchronous motor is running. A plurality of second grooves are designed on the outer circle of the rotor core, and the center lines of the slots of adjacent second grooves form an angle in the range of 15° to 30° along the outer circle of the rotor core, thereby reducing the core loss, hysteresis loss and eddy current loss of the permanent magnet synchronous motor. The first grooves and the second grooves cooperate with each other to reduce the harmonic distortion rate of the air gap magnetic flux waveform and the harmonic distortion rate of the line back electromotive force waveform generated when the permanent magnet synchronous motor is running, thereby improving the operating efficiency of the permanent magnet synchronous motor and reducing the electromagnetic noise and vibration generated during the operation of the permanent magnet synchronous motor.

[0013] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0015] Figure 1 This is a schematic diagram of the overall structure of the permanent magnet motor according to an embodiment of the present utility model;

[0016] Figure 2 This is a schematic diagram of the angle formed by multiple first grooves along the outer circle of the rotor core of the permanent magnet synchronous motor according to an embodiment of the utility model.

[0017] Description of reference numerals:

[0018] 100, stator core; 110, first groove; 120, stator winding groove; 130, stator tooth; 200, rotor core; 210, second groove; 220, magnetic steel slot. DETAILED DESCRIPTION

[0019] The following describes in detail embodiments of the present invention. Examples of the embodiments 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 intended only to explain the present invention and are not to be construed as limiting the present invention.

[0020] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They 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. Therefore, they cannot be understood as limitations on the present invention.

[0021] In the description of this utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0022] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting 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.

[0023] It should be noted that the embodiments of the present application do not limit the improvement of any method, and the functions that can be implemented by the device or apparatus are only implemented based on the hardware architecture of the device or apparatus itself.

[0024] The following is a further description of the embodiments of the present invention with reference to the accompanying drawings.

[0025] Reference Figure 1 and Figure 2 An embodiment of the present invention provides a permanent magnet motor, comprising: a stator core 100, wherein the outer circumference of the stator core 100 is designed with a plurality of first grooves 110, the inner wall of the stator core 100 is provided with a plurality of stator winding grooves 120, a plurality of stator teeth 130 are provided between adjacent stator winding grooves 120, and the plurality of stator teeth 130 are surrounded to form a circular through hole; a rotor core 200, wherein the rotor core 200 is located in the circular through hole, and the outer circumference of the rotor core 200 is designed with a plurality of second grooves 210, and the center lines of the grooves of adjacent second grooves form an angle along the outer circumference of the rotor core, and the degree range of the angle is 15° to 30°.

[0026] By designing a plurality of first grooves 110 on the outer circle of the stator core 100, the core loss, hysteresis loss and eddy current loss of the permanent magnet synchronous motor are reduced. The outer circle of the rotor core 200 is designed with a plurality of second grooves 210. The center lines of the slots of adjacent second grooves 210 form an angle in the range of 15° to 30° along the outer circle of the rotor core 200, thereby reducing the harmonic distortion rate of the air gap magnetic flux waveform and the harmonic distortion rate of the line back electromotive force waveform generated during the operation of the permanent magnet synchronous motor. The first grooves 110 and the second grooves 210 cooperate with each other to reduce the harmonic distortion rate of the air gap magnetic flux waveform and the harmonic distortion rate of the line back electromotive force waveform generated during the operation of the permanent magnet synchronous motor, thereby improving the operating efficiency of the permanent magnet synchronous motor and reducing the electromagnetic noise and vibration generated during the operation of the permanent magnet synchronous motor.

[0027] The diameters of the multiple second grooves 210 are all the same, so that the magnetic field of the permanent magnet synchronous motor will not be perpendicular to the surface of the rotor core 200. Therefore, the magnetic field of the permanent magnet synchronous motor will enter the rotor core 200 along the stator teeth 130, minimizing the leakage of the magnetic field and running more smoothly; specifically, the diameters of the multiple second grooves 210 are all 2mm-8mm, and the multiple second grooves 210 form grooves of a certain depth on the surface of the rotor core 200, and the depth range of the grooves is 0.3mm~3mm, which improves the operating efficiency of the permanent magnet synchronous motor, reduces the torque pulsation of the motor, and improves the electromagnetic noise generated during the operation of the permanent magnet synchronous motor.

[0028] As a further optional embodiment, a slot wedge for fixing the double-layer winding is embedded in the slot of the stator winding slot 120 (stator tooth 130), which can effectively prevent the double-layer winding from moving or twisting during the operation of the motor, and prevent the double-layer winding from loosening or shaking when the motor starts and stops.

[0029] When the winding is embedded in the stator winding slot 120, an insulating layer is provided on the connection surface between the winding and the stator winding slot 120 to prevent direct contact between the winding and the stator winding slot 120, thereby preventing electrical short circuits and fires. It can also improve the insulation strength of the permanent magnet motor, improve the voltage resistance level of the permanent magnet motor, reduce the current and energy loss between the winding and the stator winding slot 120, thereby further improving the efficiency of the permanent magnet motor. In addition, the insulating layer provided on the connection surface between the winding and the stator winding slot 120 can also suppress the electromagnetic interference generated by the permanent magnet synchronous motor during operation, and prevent electromagnetic waves from interfering with and damaging the equipment and the surrounding environment.

[0030] As a further optional implementation, the stator winding slots 120 are 36 slots, the number of poles of the rotor core 200 is 8 poles, and the stator winding adopts a double-layer winding. By improving the harmonic distortion rate of the motor line back electromotive force waveform and weakening some harmonic components caused by the non-sinusoidal air gap magnetic density, the hysteresis loss and eddy current loss of the motor can be reduced, the operating efficiency of the motor can be improved, and the electromagnetic noise of the motor can be improved.

[0031] The first groove 110 is welded using a laser welding process. Compared with the traditional argon arc welding process of the permanent magnet synchronous motor, laser welding can reduce the iron loss of the permanent magnet synchronous motor and improve the operating efficiency of the permanent magnet synchronous motor; and the welding speed is faster, which can greatly shorten the production cycle of the stator core 100 and improve production efficiency.

[0032] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above implementation. Technical personnel familiar with the field can also make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present invention.

[0033] Throughout this specification, references to terms such as "one embodiment," "further embodiments," "some specific embodiments," or "some examples" indicate that the specific features, structures, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these 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 any one or more embodiments or examples.

[0034] While 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 invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A permanent magnet synchronous motor, characterized in that: include: A stator core, wherein the outer circumference of the stator core is designed with a plurality of first grooves, the inner wall of the stator core is provided with a plurality of stator winding slots, a plurality of stator teeth are provided between adjacent stator winding slots, and the plurality of stator teeth surround and form a circular through hole; The rotor core is located in the circular through hole, and the outer circle of the rotor core is designed with multiple second grooves. The center lines of the slots of adjacent second grooves form an angle along the outer circle of the rotor core, and the degree range of the angle is 15° to 30°.

2. The permanent magnet synchronous motor according to claim 1, characterized in that: The diameter of the second groove ranges from 2 mm to 8 mm.

3. The permanent magnet synchronous motor according to claim 2, characterized in that: The stator teeth are provided with slot wedges at the stator winding slots for fixing the windings.

4. The permanent magnet synchronous motor according to claim 3, characterized in that: The winding is a double-layer winding.

5. The permanent magnet synchronous motor according to claim 3, characterized in that: An insulating layer is further provided between the winding and the stator winding slot.

6. The permanent magnet synchronous motor according to claim 1, characterized in that: The first groove is used for laser welding.

Images