Permanent magnet motor rotor and permanent magnet motor

Abstract

The permanent magnet motor rotor comprises a carbon fiber core layer, the two end faces of the carbon fiber core layer are each provided with a plurality of isolation grooves, each isolation groove is internally provided with a permanent magnet, and the axial depth of each isolation groove is smaller than half of the axial thickness of the carbon fiber core layer; and the carbon fiber sleeve layer is arranged on the outer arc surface of the carbon fiber core layer in a sleeving manner, and the carbon fiber sleeve layer is used for surrounding the permanent magnet. The carbon fiber core layer adopts the carbon fibers, and the low density of the carbon fibers can reduce the mass of the whole motor, so that the energy efficiency and the response speed are improved; the carbon fiber sleeve layer comprises continuous high-modulus carbon fibers and a synthesized PPS base material and has high strength and rigidity, so that the carbon fiber sleeve layer can bear centrifugal force and inertia force during high-speed rotation, and the PPS base material has excellent heat resistance and can bear the temperature of-45 DEG C to 150 DEG C.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a permanent magnet motor rotor and a permanent magnet motor. Background Art

[0002] At present, with the rapid development of the new energy vehicle industry, the design of the motor, especially the permanent magnet synchronous motor, as one of the three core components of new energy vehicles, has received more and more attention within the industry. The permanent magnet synchronous motor is mainly composed of the stator, rotor, end cover, junction box and other parts. Among them, the rotor, as the main moving part of power transmission, plays a vital role in motor design.

[0003] In the prior art, the rotors of permanent magnet synchronous motors are mostly made of metal or metal + carbon fiber (only attached to the surface). However, in the process of implementing the technical solution of the invention in the embodiment of the present application, the inventors of the present application found that the above technology has at least the following technical problems: the rotor made of metal is not only heavy, but also has low energy conversion, and the metal is prone to fatigue. The metal sleeve has thermal expansion characteristics and cannot withstand high temperatures (-45°C ~ 150°C). At the same time, the metal in the metal sleeve acts as a conductor, and strong eddy currents will be generated during rotation, increasing losses and reducing efficiency. Utility Model Content

[0004] In order to overcome the above shortcomings, the purpose of the present application is to provide a permanent magnet motor rotor and a permanent magnet motor, which can not only withstand the centrifugal force and inertial force during high-speed rotation, but also withstand the temperature of -45°C to 150°C.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] A permanent magnet motor rotor, comprising:

[0007] A carbon fiber core layer, wherein both end surfaces of the carbon fiber core layer are provided with a plurality of isolation grooves, each of the isolation grooves is provided with a permanent magnet, and the axial depth of the isolation grooves is less than half of the axial thickness of the carbon fiber core layer; and

[0008] The carbon fiber sheath is sheathed on the outer arc surface of the carbon fiber core layer, and the carbon fiber sheath is used to surround the permanent magnet. Preferably, the carbon fiber sheath is woven from continuous high modulus carbon fibers and a synthetic PPS substrate.

[0009] In one embodiment, the carbon fiber sheath of the PPS substrate is woven into a two-dimensional braided winding shape by continuous high modulus carbon fiber and a synthetic PPS substrate.

[0010] In one embodiment, the carbon fiber core layer is woven from continuous high modulus carbon fibers to form a three-dimensional weaving shape.

[0011] In one embodiment, the carbon fiber core layer is formed by weaving continuous high modulus carbon fiber and a synthetic PPS substrate into a two-dimensional braided winding shape.

[0012] In one embodiment, the projection pattern of the isolation groove on the end surface of the carbon fiber core layer is V-shaped, and two permanent magnets are arranged in each isolation groove, and the two permanent magnets are symmetrically arranged in the isolation groove.

[0013] In one embodiment, the V-shaped angle of the isolation groove is B, and the angle B is between 75-90°.

[0014] In one embodiment, the isolation grooves at both end surfaces of the carbon fiber core layer correspond to each other.

[0015] In one embodiment, a mounting hole is provided at the center of the carbon fiber core layer for the motor shaft to pass through, and at least one keyway is provided in the mounting hole.

[0016] In one embodiment, the carbon fiber core layer is further provided with a plurality of holes (weight reduction holes), which are arranged at equal intervals along the circumference of the mounting hole, and the holes extend axially along the carbon fiber core layer and penetrate through both end surfaces of the carbon fiber core layer.

[0017] An embodiment of the present application also provides a permanent magnet motor, which includes the above-mentioned permanent magnet motor rotor.

[0018] Beneficial Effects

[0019] The carbon fiber core layer in the present application is mainly made of carbon fiber. The low density of carbon fiber can reduce the mass of the entire motor, thereby improving energy efficiency and response speed.

[0020] By sheathing a carbon fiber sheath of a PPS base material on the outer arc surface of the carbon fiber core layer, the main material of the carbon fiber sheath of the PPS base material is continuous high modulus carbon fiber and a synthetic PPS base material, which has high strength and rigidity, so that the carbon fiber sheath of the PPS base material can withstand the centrifugal force and inertial force during high-speed rotation, and the PPS base material has excellent heat resistance and can withstand temperatures of -45°C to 150°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide an understanding of the technical solution of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solution of the present disclosure and do not constitute a limitation on the technical solution of the present disclosure. The shapes and sizes of the components in the accompanying drawings do not reflect the actual proportions and are only intended to illustrate the content of the present application.

[0022] Figure 1 A schematic diagram of the permanent magnet rotor structure provided in an embodiment of the present application;

[0023] Figure 2 A schematic cross-sectional view of a permanent magnet rotor provided in an embodiment of the present application;

[0024] Figure 3 A schematic diagram of the structure of a permanent magnet rotor provided in an embodiment of the present application;

[0025] Figure 4 for Figure 3 Enlarged schematic diagram of part A. DETAILED DESCRIPTION

[0026] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the present application and are not limited to the scope of the present application. The implementation conditions adopted in the examples can be further adjusted as the conditions of the specific manufacturer, and the unspecified implementation conditions are usually the conditions in conventional experiments.

[0027] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connecting" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. In this article, "electrical connection" includes the situation where the constituent elements are connected together through an element with some electrical function. "Elements with some electrical function" are not particularly limited as long as they can transfer electrical signals between the connected constituent elements. "Elements with some electrical function" can be, for example, electrodes or wiring, or switching elements such as transistors, or other functional elements such as resistors, inductors or capacitors. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0028] In this application, the directions or positional relationships indicated by the terms "upper", "lower", "inner", "middle", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0029] The present application discloses a permanent magnet motor rotor and a permanent magnet motor, the permanent magnet motor rotor comprises a carbon fiber core layer and a carbon fiber sheath layer of a PPS (Polyphenylene sulfide, PPS polyphenylene sulfide) substrate, both end faces of the carbon fiber core layer are provided with a number of isolation grooves, each isolation groove is provided with a permanent magnet, and the axial depth of the isolation groove is less than half of the axial thickness of the carbon fiber core layer; the carbon fiber sheath layer of the PPS substrate is sheathed on the outer arc surface of the carbon fiber core layer, and the carbon fiber sheath layer of the PPS substrate is woven from continuous high modulus carbon fiber and synthetic PPS substrate. The main material of the carbon fiber core layer in the present application is carbon fiber, and the low density of carbon fiber can reduce the mass of the entire motor, thereby improving energy efficiency and response speed; the main material of the carbon fiber sheath layer of the PPS substrate is continuous high modulus carbon fiber and synthetic PPS substrate, which has high strength and rigidity, so that it can withstand centrifugal force and inertial force during high-speed rotation, and the PPS substrate has excellent heat resistance and can withstand temperatures of -45°C to 150°C.

[0030] A permanent magnet motor provided in an embodiment of the present application includes a permanent magnet rotor. It should be noted that by adopting a permanent magnet rotor, the centrifugal stress and inertia force generated by the permanent magnet motor when it rotates at a high speed (speed of 20,000 revolutions per minute) can be adapted, and it can also operate at -45°C to 150°C.

[0031] Next join Figure 1-Figure 4 A permanent magnet motor rotor provided in an embodiment of the present application is described, and the permanent magnet motor rotor includes a carbon fiber core layer 10 and a carbon fiber sheath layer 20 of a PPS substrate. The thickness of the carbon fiber sheath layer 20 is between 1 mm and 5 mm, and it wraps the carbon fiber core layer to prevent the permanent magnet from being thrown out during high-speed rotation, quickly transfer heat, and keep the temperature of the motor within an acceptable range (the solution of the present application is used for a long time under high-speed operation and temperature up to 200°C), thereby improving the efficiency and life of the motor.

[0032] A plurality of isolation grooves 11 are provided at both end surfaces of the carbon fiber core layer 10, a permanent magnet 30 is provided in each isolation groove 11, and an axial depth of the isolation groove 11 is less than half of the axial thickness of the carbon fiber core layer 10; a carbon fiber sheath 20 of a PPS substrate is sheathed on the outer arc surface of the carbon fiber core layer 10, wherein the carbon fiber sheath of the PPS substrate is woven from continuous high modulus carbon fiber and a synthetic PPS substrate.

[0033] It should be noted that the carbon fiber core layer 10 in this embodiment specifically refers to the rotor core, the carbon fiber sleeve layer of the PPS substrate specifically refers to the sleeve, the rotor core is configured to be made of a continuous carbon fiber thermal material, and the sleeve is made of a continuous carbon fiber thermal material of the PPS substrate. The axial thickness of the carbon fiber core layer 10 in this embodiment is specifically as follows: Figure 2The value of H1 in the figure is as follows: Figure 2 The value of H2, where H2<1 / 2H1.

[0034] In this embodiment, the carbon fiber sheath 20 of the PPS substrate is formed by two-dimensionally weaving and winding continuous high-modulus carbon fiber and a synthetic PPS substrate, which is beneficial to enhancing the structural strength of the carbon fiber sheath 20 of the PPS substrate, so that it can withstand the centrifugal force and inertial force during high-speed rotation, reduce losses, and make full use of the heat resistance of the PPS substrate, so that the carbon fiber sheath of the PPS substrate can withstand temperatures of -45°C to 150°C.

[0035] In this embodiment, the carbon fiber core layer 10 is formed by three-dimensional weaving of continuous high modulus carbon fiber. The low density of the fiber can reduce the mass of the entire motor, thereby improving energy efficiency and response speed. In addition, the thermal conductivity of the continuous high modulus carbon fiber can help transfer heat quickly, which can effectively improve the efficiency and service life of the motor.

[0036] As a variation of the above-mentioned embodiment, the carbon fiber core layer 10 is formed by three-dimensional weaving of continuous high modulus carbon fiber and synthetic PPS substrate. This design integrates the synthetic PPS substrate and the continuous high modulus carbon fiber structure, which is beneficial to enhancing the structural strength of the carbon fiber core layer 10, so that it can withstand the centrifugal force and inertial force during high-speed rotation. The low density of the fiber can reduce the mass of the entire motor, thereby improving energy efficiency and response speed. In addition, the thermal conductivity of the continuous high modulus carbon fiber can help transfer heat quickly, which can effectively improve the efficiency and service life of the motor.

[0037] refer to Figure 3-Figure 4 In the present embodiment, the projection pattern of the isolation groove 11 on the end surface of the carbon fiber core layer is in a "V" shape, and two permanent magnets 30 are arranged in each isolation groove 11, and the two permanent magnets 30 are symmetrically arranged in the isolation groove 11. Specifically, 8 "V"-shaped isolation grooves 11 are arranged on the surface of the carbon fiber core layer 10 of the present application, and the 8 "V"-shaped isolation grooves 11 are evenly spaced along the circumferential direction of the carbon fiber core layer 10. Furthermore, the "V"-shaped angle of the isolation groove 11 is B, wherein the angle B is between 75-90°, and the angle between the "V"-shaped angles of the isolation groove 11 can be adjusted according to actual conditions, and this embodiment is not specifically limited.

[0038] refer to Figure 3-Figure 2 In this embodiment, a mounting hole 12 is provided at the center of the carbon fiber core layer 10 for the motor shaft to pass through. Furthermore, at least one keyway 121 is provided in the mounting hole 12 , and the motor shaft is installed in the mounting hole 12 through the keyway 121 .

[0039] refer to Figure 3-Figure 2In the present embodiment, the carbon fiber core layer 10 is further provided with a plurality of weight-reducing holes 13, and the plurality of weight-reducing holes 13 are arranged at equal intervals along the circumference of the mounting hole, and the weight-reducing holes 13 are located between the isolation groove 11 and the mounting hole 12, and the weight-reducing holes 13 all axially penetrate the carbon fiber core layer 10. Specifically, in the present application, 8 weight-reducing holes 13 are arranged on the surface of the carbon fiber core layer 10, and the cross-sectional shape of the weight-reducing holes can be circular, diamond or any other shape. By designing the weight-reducing holes 13, the weight of the rotor can be further reduced, and the moment of inertia of the rotor can be reduced, thereby effectively improving the rotor response speed.

[0040] The above embodiments are only for illustrating the technical concept and features of the present application, and their purpose is to enable people familiar with the technology to understand the content of the present application and implement it accordingly, and they cannot be used to limit the protection scope of the present application. Any equivalent transformation or modification made according to the spirit of the present application shall be included in the protection scope of the present application.

Claims

1. A permanent magnet motor rotor, characterized in that: include: A carbon fiber core layer, wherein a plurality of isolation grooves are provided at both ends of the carbon fiber core layer, a permanent magnet is provided in each isolation groove, and an axial depth of the isolation groove is less than half of the axial thickness of the carbon fiber core layer; and The carbon fiber sheath is sheathed on the outside of the carbon fiber core layer, and the carbon fiber sheath is used to surround the permanent magnet.

2. The permanent magnet motor rotor according to claim 1, characterized in that: The projection pattern of the isolation groove on the end surface of the carbon fiber core layer is V-shaped, and two permanent magnets are arranged in each isolation groove, and the two permanent magnets are symmetrically arranged in the isolation groove.

3. The permanent magnet motor rotor according to claim 1, characterized in that: The V-shaped included angle of the isolation groove is B, and the included angle B is between 75-90°.

4. The permanent magnet motor rotor according to claim 1, characterized in that: The isolation grooves at both end surfaces of the carbon fiber core layer correspond to each other.

5. The permanent magnet motor rotor according to claim 1, characterized in that: The carbon fiber core layer is provided with a mounting hole through which the motor shaft passes, and at least one keyway is provided in the mounting hole.

6. The permanent magnet motor rotor according to claim 5, characterized in that: The carbon fiber core layer is further provided with a plurality of holes, which are arranged at equal intervals along the circumference of the mounting hole, and the holes extend along the axial direction of the carbon fiber core layer and penetrate through both end surfaces of the carbon fiber core layer.

7. The permanent magnet motor rotor according to claim 1, characterized in that: The carbon fiber sheath is formed by weaving continuous high-modulus carbon fibers and a synthetic PPS substrate in a two-dimensional braided winding process.

8. The permanent magnet motor rotor according to claim 1, characterized in that: The carbon fiber core layer is woven from continuous high-modulus carbon fibers to form a three-dimensional weaving shape.

9. The permanent magnet motor rotor according to claim 1, characterized in that: The carbon fiber core layer is woven from continuous high modulus carbon fibers and a synthetic PPS substrate in a two-dimensionally braided winding process.

10. A permanent magnet motor, characterized in that: It comprises a permanent magnet motor rotor as claimed in any one of claims 1 to 9.

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