A rotor topology dual three-phase permanent magnet synchronous motor

Abstract

A rotor topology dual three-phase permanent magnet synchronous motor comprises a rotor core, magnetic poles and a stator; the rotor core is arranged inside the stator, and a plurality of magnetic poles are arranged inside the rotor core along the circumferential direction; each magnetic pole comprises a first layer of magnetic steel and a second layer of magnetic steel, both of which are V-shaped, and the magnetization direction of the first layer of magnetic steel and the second layer of magnetic steel is radial. The present invention overcomes the defect that the traditional single-layer V-shaped permanent magnet synchronous motor cannot improve the average torque while using less NdFeB permanent magnet material.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a rotor topology dual three-phase permanent magnet synchronous motor. Background Art

[0002] With the extensive application of rare earth permanent magnet materials in motors, permanent magnet motors are increasingly appearing in industrial applications. Among them, dual three-phase motors have the advantages of high fault tolerance and high reliability due to the redundancy of the number of phases, which makes them attract much attention in low-voltage and high-power applications. However, the high price of permanent magnet materials in permanent magnet motors has always been a major problem faced by the industry in cost control. In addition, blindly reducing the amount of permanent magnet materials will lead to a decline in motor performance, resulting in problems such as reduced average torque and reduced efficiency. Summary of the invention

[0003] The purpose of the present invention is to provide a rotor topology dual three-phase permanent magnet synchronous motor to solve the problem that blindly reducing the amount of permanent magnet material will lead to a decrease in motor performance, such as a decrease in average torque and a decrease in efficiency.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A rotor topology dual three-phase permanent magnet synchronous motor comprises a rotor core, magnetic poles and a stator; the rotor core is arranged inside the stator, and a plurality of magnetic poles are arranged inside the rotor core along a circumferential direction;

[0006] Each magnetic pole includes a first layer of magnetic steel and a second layer of magnetic steel. The first layer of magnetic steel and the second layer of magnetic steel are both V-shaped, and the magnetization direction of the first layer of magnetic steel and the second layer of magnetic steel is a radial direction.

[0007] Furthermore, each magnetic pole is provided with a first layer of V-shaped magnetic steel grooves and a second layer of V-shaped magnetic steel grooves. The first layer of V-shaped magnetic steel grooves are arranged at intervals along the circumferential direction on one side close to the surface of the rotor core, and the second layer of V-shaped magnetic steel grooves are arranged along the circumferential direction on the radial inner side of the first layer of V-shaped magnetic steel grooves.

[0008] Furthermore, the first layer of V-shaped magnetic steel grooves and the second layer of V-shaped magnetic steel grooves are symmetrical about the center axis of the magnetic steel grooves, and the first layer of magnetic steel and the second layer of magnetic steel are placed in the first layer of V-shaped magnetic steel grooves and the second layer of V-shaped magnetic steel grooves.

[0009] Furthermore, the first layer of magnetic steel and the second layer of magnetic steel are both bonded by resin.

[0010] Furthermore, the first layer of magnetic steel and the second layer of magnetic steel are both long rectangular magnetic steels and are made of high remanence rare earth permanent magnet material, wherein the length of the first layer of magnetic steel is greater than that of the second layer of magnetic steel, and the width and thickness of the first layer of magnetic steel and the second layer of magnetic steel are the same.

[0011] Furthermore, the angle θ1 between the magnetizing direction of the first layer of magnetic steel and the axis of the first layer of V-shaped magnetic steel slot is 0°<θ1<30°, the angle θ2 between the magnetizing direction of the second layer of magnetic steel and the tangent of the second layer of V-shaped magnetic steel slot is 0°<θ2<30°, and the magnetizing directions of the first layer of magnetic steel and the second layer of magnetic steel are simultaneously toward the outside of the rotor core or the inside of the rotor core, and under adjacent magnetic poles of the rotor core, the magnetizing directions of the magnetic steel are alternately N-pole and S-pole.

[0012] Furthermore, both ends of the first layer V-shaped magnetic steel groove and the second layer V-shaped magnetic steel groove have tip air grooves with the same width as the magnetic steel; a gap is left between the first layer V-shaped magnetic steel groove and the second layer V-shaped magnetic steel groove, and the spacing is 0.9mm to 2.7mm.

[0013] Furthermore, the permanent magnet included angle of the first layer of V-shaped magnetic steel slots is 130°, and the permanent magnet included angle of the second layer of V-shaped magnetic steel slots is 115°.

[0014] Furthermore, an air gap of 1 mm is provided between the rotor core and the stator, and an armature winding is provided on the stator.

[0015] Compared with the prior art, the present invention has the following technical effects:

[0016] The present invention includes a rotor core and a plurality of magnetic poles arranged inside the rotor core along the circumferential direction. A first layer of V-shaped magnetic steel slots and a second layer of V-shaped magnetic steel slots are arranged under each magnetic pole, the first layer of V-shaped magnetic steel slots are arranged at intervals along the circumferential direction close to the surface of the rotor core, the second layer of V-shaped magnetic steel slots are arranged along the circumferential direction radially inward of the first layer of V-shaped magnetic steel slots, and the angle of the permanent magnet is slightly smaller than that of the first layer of V-shaped magnetic steel slots, and the first and second layers of V-shaped magnetic steel slots are symmetrical about the center axis of the magnetic steel slots and are approximately in the radial magnetization direction. The present invention overcomes the defect that the traditional single-layer V-shaped permanent magnet synchronous motor cannot improve the average torque while using less NdFeB permanent magnet material. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of a dual three-phase permanent magnet synchronous motor with a special rotor topology that saves permanent magnet materials according to the present invention;

[0018] Figure 2 This is a schematic diagram of the opening angle of the rotor magnetic steel of the double V-shaped motor of the present invention; DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Implementation example Figure 1 As shown, a special double-layer V-shaped topology dual three-phase permanent magnet synchronous motor for saving permanent magnet materials of the present invention comprises a rotor core 3 and a plurality of magnetic poles arranged inside the rotor core 3 along the circumferential direction. A first layer of V-shaped magnetic steel slots 7 and a second layer of V-shaped magnetic steel slots 8 are arranged under each magnetic pole, the first layer of V-shaped magnetic steel slots 7 are arranged at intervals along the circumferential direction on one side close to the surface of the rotor core 3, and the second layer of V-shaped magnetic steel slots 8 are arranged along the circumferential direction on the radial inner side of the first layer of V-shaped magnetic steel slots 7. The first layer of V-shaped magnetic steel slots 7 and the second layer of V-shaped magnetic steel slots 8 are symmetrical about the central axis of the magnetic steel slots, the first layer of magnetic steel 4 and the second layer of magnetic steel 5 placed in the first layer of V-shaped magnetic steel slots 7 and the second layer of V-shaped magnetic steel slots 8 are bonded by resin, and the magnetization direction of the first layer of magnetic steel 4 and the second layer of magnetic steel 5 is approximately in the radial direction.

[0023] The first layer of magnetic steel 4 and the second layer of magnetic steel 5 are both slender rectangular magnetic steels with similar appearance. The slender rectangular magnetic steels are made of high remanence rare earth permanent magnet materials. The length of the first layer of magnetic steel 4 is slightly larger than that of the second layer of magnetic steel 5, and the width and thickness of the first layer of magnetic steel 4 and the second layer of magnetic steel 5 are the same.

[0024] The angle θ1 between the magnetizing direction of the first layer of magnetic steel 4 and the axis of the first layer of V-shaped magnetic steel slot 7 is 0°<θ1<30°, the angle θ2 between the magnetizing direction of the second layer of magnetic steel 5 and the tangent of the second layer of V-shaped magnetic steel slot 8 is 0°<θ2<30°, the magnetizing directions of the first layer of magnetic steel 4 and the second layer of magnetic steel 5 are simultaneously toward the outside of the rotor core 3 or the inside of the rotor core 3, and under adjacent magnetic poles of the rotor core 3, the magnetizing directions of the magnetic steel are alternately N pole and S pole.

[0025] like Figure 2 As shown, both ends of the first layer V-shaped magnetic steel slot 7 and the second layer V-shaped magnetic steel slot 8 have pointed air slots with the same width as the magnetic steel. There is a gap between the first layer V-shaped magnetic steel slot 7 and the second layer V-shaped magnetic steel slot 8. The motor has the best performance when the simulation parameterized spacing is 0.9mm~2.7mm. The permanent magnet angle of the first layer V-shaped magnetic steel slot 7 is 130°, and the permanent magnet angle of the second layer V-shaped magnetic steel slot 8 is 115°. In addition, a 1mm air gap is provided between the double V-shaped rotor core 3 and the stator 1, and the motor stator 1 is provided with an armature winding 2.

[0026] The present invention provides a special rotor topology dual three-phase permanent magnet synchronous motor that saves permanent magnet materials, including a rotor core, a plurality of magnetic poles arranged inside the rotor core along the circumferential direction, a first layer of V-shaped magnetic steel slots and a second layer of V-shaped magnetic steel slots are arranged under each magnetic pole, the first layer of V-shaped magnetic steel slots are arranged at intervals along the circumferential direction on one side close to the surface of the rotor core, the second layer of V-shaped magnetic steel slots are arranged along the circumferential direction on the radial inner side of the first layer of V-shaped magnetic steel slots, and the angle of the permanent magnet is slightly smaller than that of the first layer of V-shaped magnetic steel slots, the first and second layers of V-shaped magnetic steel slots are symmetrical about the central axis of the magnetic steel slots and are approximately in the radial magnetization direction. The present invention overcomes the defects of the traditional single-layer V-shaped permanent magnet synchronous motor, as shown in Table 1, effectively saves 16.7% of the amount of NdFeB permanent magnet material, increases the average torque of the motor by 4.5%, and reduces the economic cost while ensuring the efficient operation of the motor.

[0027] Table 1 is the comparison results of the parameters of the double-layer V-type topology of the present invention and the traditional V-type rotor

[0028]

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rotor topology dual three-phase permanent magnet synchronous motor, characterized in that: It comprises a rotor core (3), magnetic poles and a stator (1); the rotor core (3) is arranged inside the stator (1), and a plurality of magnetic poles are arranged inside the rotor core (3) along a circumferential direction; Each magnetic pole comprises a first layer of magnetic steel (4) and a second layer of magnetic steel (5), the first layer of magnetic steel (4) and the second layer of magnetic steel (5) are both V-shaped, and the magnetization direction of the first layer of magnetic steel (4) and the second layer of magnetic steel (5) is a radial direction; A first layer of V-shaped magnetic steel slots (7) and a second layer of V-shaped magnetic steel slots (8) are provided at each magnetic pole, the first layer of V-shaped magnetic steel slots (7) are arranged at intervals along the circumferential direction on one side close to the surface of the rotor core (3), and the second layer of V-shaped magnetic steel slots (8) are arranged along the circumferential direction on the radial inner side of the first layer of V-shaped magnetic steel slots (7); The first layer of magnetic steel (4) and the second layer of magnetic steel (5) are both long rectangular magnetic steels and are made of high remanence rare earth permanent magnetic material, wherein the length of the first layer of magnetic steel (4) is greater than the length of the second layer of magnetic steel (5), and the width and thickness of the first layer of magnetic steel (4) and the second layer of magnetic steel (5) are the same; Both ends of the first layer V-shaped magnetic steel groove (7) and the second layer V-shaped magnetic steel groove (8) have tip air grooves with the same width as the magnetic steel; a gap is left between the first layer V-shaped magnetic steel groove (7) and the second layer V-shaped magnetic steel groove (8), and the spacing is 0.9mm to 2.7mm.

2. A rotor topology dual three-phase permanent magnet synchronous motor according to claim 1, characterized in that: The first layer of V-shaped magnetic steel grooves (7) and the second layer of V-shaped magnetic steel grooves (8) are symmetrical about the central axis of the magnetic steel grooves, and the first layer of magnetic steel (4) and the second layer of magnetic steel (5) are placed in the first layer of V-shaped magnetic steel grooves (7) and the second layer of V-shaped magnetic steel grooves (8).

3. A rotor topology dual three-phase permanent magnet synchronous motor according to claim 2, characterized in that: The first layer of magnetic steel (4) and the second layer of magnetic steel (5) are both bonded by resin.

4. The rotor topology dual three-phase permanent magnet synchronous motor according to claim 1, characterized in that: The angle θ1 between the magnetizing direction of the first layer of magnetic steel (4) and the axis of the first layer of V-shaped magnetic steel slot (7) is 0°<θ1<30°, the angle θ2 between the magnetizing direction of the second layer of magnetic steel (5) and the tangent of the second layer of V-shaped magnetic steel slot (8) is 0°<θ2<30°, the magnetizing directions of the first layer of magnetic steel (4) and the second layer of magnetic steel (5) are simultaneously toward the outside of the rotor core (3) or the inside of the rotor core (3), and the magnetizing directions of the magnetic steel are alternately N pole and S pole under adjacent magnetic poles of the rotor core (3).

5. The rotor topology dual three-phase permanent magnet synchronous motor according to claim 1, characterized in that: The permanent magnet included angle of the first layer of V-shaped magnetic steel slots (7) is 130°, and the permanent magnet included angle of the second layer of V-shaped magnetic steel slots (8) is 115°.

6. The rotor topology dual three-phase permanent magnet synchronous motor according to claim 1, characterized in that: An air gap of 1 mm is provided between the rotor iron core (3) and the stator (1), and an armature winding (2) is provided on the stator (1).

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