Motor rotor magnetic circuit structure for new energy automobile

Abstract

The utility model discloses a motor rotor magnetic circuit structure for a new energy automobile, which comprises a rotor punching sheet, a plurality of combined groove units are uniformly arranged along the circumferential direction of the rotor punching sheet, each combined groove unit comprises a V-shaped structure and a linear structure, each V-shaped structure comprises two symmetrically arranged rectangular grooves, strip-shaped first permanent magnets are embedded in the rectangular grooves, and the strip-shaped first permanent magnets are embedded in the rectangular grooves. One end of each rectangular groove is provided with a hook-shaped air groove, and the other end of each rectangular groove is provided with a trapezoidal air groove; a strip-shaped second permanent magnet is embedded in a rectangular groove of the linear structure, and triangular air grooves are formed in the two ends of the groove of the linear structure. According to the utility model, the included angle between the two radially magnetized first permanent magnets and the pole arc angle of the second permanent magnet are set and are matched with the auxiliary grooves on the circumferential surface of the rotor punching sheet; the rotor punching sheet adopts a self-bonding stacking mode, and the rotor adopts a four-section skewed pole structural design, so that the operation efficiency of the motor is effectively improved, and the operation noise is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and in particular relates to a motor rotor magnetic circuit structure for new energy vehicles. Background Art

[0002] With the continuous development of new energy vehicles, higher requirements are also put forward for their drive motors. Traditional built-in motors can be divided into tangential and radial types according to the magnetization direction of their permanent magnets and the rotation direction of the motor. The tangential rotor magnetic circuit is used when there are more poles, which can increase the air gap flux density, but the leakage flux is relatively large; the radial motor can improve the comprehensive performance of the motor by adjusting the magnetic steel angle and the pole arc angle, but because the magnetic steel pole arc angle and its angle are fixed, it is difficult to adjust the torque pulsation, cogging torque and back electromotive force distortion rate.

[0003] The Chinese patent specification discloses a motor rotor punching sheet, motor rotor, motor and new energy vehicle (publication number CN111200324B). The invention effectively reduces the stress of the magnetic isolation bridge and reduces the thickness of the magnetic isolation bridge. While ensuring the centrifugal stress strength of the rotor, it improves the electromagnetic performance of the motor. The Chinese patent specification also discloses a hybrid rotor magnetic circuit structure of a permanent magnet synchronous motor (publication number CN214069687U). This utility model solves the problem of relatively large traditional tangential magnetic leakage. However, the above patents do not propose specific solutions for reducing the noise of motor operation and improving the efficiency of motor operation. Utility Model Content

[0004] 1. Technical issues to be solved

[0005] The utility model provides a motor rotor magnetic circuit structure for new energy vehicles, and its purpose is to solve the problems of large running noise and low running efficiency of the motors of existing new energy vehicles.

[0006] 2. Technical Solution

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions, including:

[0008] A rotor punching sheet, wherein a plurality of combined slot units are evenly arranged along the circumference thereof, each combined slot unit comprises a "V"-shaped structure and an "I"-shaped structure, wherein the "V"-shaped structure comprises two symmetrically arranged rectangular slots, wherein a first permanent magnet of a bar shape is embedded in the rectangular slots, wherein ends of the two rectangular slots approaching each other are each provided with a hook-shaped air slot connected thereto, and ends of the two rectangular slots away from each other are each provided with a trapezoidal air slot connected thereto; wherein a second permanent magnet of a bar shape is embedded in the rectangular slot of the "I"-shaped structure, and triangular air slots are provided at both ends of the "I"-shaped structure slots.

[0009] Furthermore, the rotor punching is also provided with fan-shaped air grooves, and the fan-shaped air grooves are located between every two adjacent "V"-shaped structures and close to the inner circle of the rotor punching.

[0010] Furthermore, a plurality of axial auxiliary grooves are evenly arranged along the circumferential direction on the circumferential surface of the rotor punching sheet, and the auxiliary grooves are distributed one by one between the trapezoidal air grooves and the triangular air grooves.

[0011] Furthermore, the angle β between the two symmetrical rectangular grooves of the "V"-shaped structure is 100 0 —110 0 The "I"-shaped structural groove occupies a polar arc angle θ of 28 0 —32 0 .

[0012] Furthermore, the inner edge of the rotor punching sheet is also provided with a spline groove and a marking groove.

[0013] Preferably, the rotor punchings are stacked in a self-adhesive manner to form a rotor core, and the rotor adopts a four-section skewed pole structure design.

[0014] 3. Beneficial Effects

[0015] The utility model sets the angle between the two radially magnetized first permanent magnets and the pole arc angle of the second permanent magnet, and makes them match with the auxiliary grooves on the circumferential surface of the rotor punching sheet; the rotor punching sheet adopts a self-adhesive stacking method, and its rotor adopts a four-section oblique pole structure design, which effectively improves the operating efficiency of the motor and reduces the operating noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the magnetic circuit structure of the rotor punching of this embodiment.

[0017] Figure 2 Schematic diagram of the angle between the first permanent magnets and the pole arc angle of the second permanent magnet in this embodiment.

[0018] Figure 3 Schematic diagram of the rotor structure of this embodiment. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can have a clearer understanding.

[0020] Example

[0021] This embodiment includes:

[0022] A rotor punching 1, wherein a plurality of combined slot units are evenly arranged along the circumference of the rotor punching, each of which includes a "V"-shaped structure and an "I"-shaped structure, wherein the "V"-shaped structure includes two symmetrically arranged rectangular slots, wherein a first permanent magnet 4 in the shape of a bar is embedded in the rectangular slot, and a hook-shaped air slot 5 connected thereto is provided at one end of the two rectangular slots close to each other, and a trapezoidal air slot 2 connected thereto is provided at one end of the two rectangular slots away from each other; wherein a second permanent magnet 3 in the shape of a bar is embedded in the rectangular slot of the "I"-shaped structure, and triangular air slots 6 are provided at both ends of the slot of the "I"-shaped structure. The first permanent magnet and the second permanent magnet are both radially magnetized, and the hook-shaped air slot, the trapezoidal air slot, and the triangular air slot are all magnetic isolation slots, and the magnetic isolation slots cooperate with the first permanent magnet and the second permanent magnet to increase the direct-axis magnetic resistance and improve the weak magnetic performance.

[0023] Furthermore, the rotor punching is also provided with a fan-shaped air groove 8, which has the effect of reducing weight. The fan-shaped air groove is located between every two adjacent "V"-shaped structures and close to the inner circle of the rotor punching.

[0024] Furthermore, a plurality of axial auxiliary grooves 7 are evenly arranged along the circumferential direction on the circumferential surface of the rotor punching sheet, and the auxiliary grooves are distributed between the trapezoidal air grooves 2 and the triangular air grooves 6 in a one-to-one correspondence.

[0025] Furthermore, the included angle β of the two symmetrical rectangular grooves of the "V"-shaped structure in this embodiment is 106 0 The "I"-shaped structural slot occupies a polar arc angle θ of 30 0 .

[0026] By adjusting the included angle of the two first permanent magnets with radial magnetization and the pole arc angle of the second permanent magnet and cooperating with the auxiliary grooves on the circumferential surface of the rotor punching, the torque pulsation and back electromotive force distortion rate can be effectively reduced, which helps to reduce motor noise.

[0027] Furthermore, the inner edge of the rotor punching is also provided with a spline groove 9 and a marking groove 10. The spline groove is used to install the motor shaft 22, and the marking groove facilitates the stacking of the rotor punching.

[0028] Preferably, the rotor punchings are stacked in a self-adhesive manner to form the rotor core 21, and the rotor 20 is designed with a four-stage skew pole structure, with a skew pole angle of 2.7 0 The self-adhesive stacking method and four-stage oblique pole structure design are beneficial to improving motor efficiency and reducing noise.

[0029] The utility model sets the angle between the two radially magnetized first permanent magnets and the pole arc angle of the second permanent magnet, and makes them match with the auxiliary grooves on the circumferential surface of the rotor punching sheet; the rotor punching sheet adopts a self-adhesive stacking method, and its rotor adopts a four-section oblique pole structure design, which effectively improves the operating efficiency of the motor and reduces the operating noise.

Claims

1. A motor rotor magnetic circuit structure for a new energy vehicle, comprising a rotor punching sheet (1), characterized in that: The rotor punching sheet is evenly provided with a plurality of combined slot units along its circumference, each combined slot unit comprising a "V"-shaped structure and an "I"-shaped structure, the "V"-shaped structure comprising two symmetrically arranged rectangular slots, wherein a first permanent magnet (4) of a bar shape is embedded in the rectangular slot, and a hook-shaped air slot (5) communicating with the first permanent magnet (4) is provided at one end of the two rectangular slots close to each other, and a trapezoidal air slot (2) communicating with the first permanent magnet (3) is provided at one end of the two rectangular slots away from each other; the rectangular slot of the "I"-shaped structure has a second permanent magnet (3) of a bar shape embedded in the rectangular slot, and triangular air slots (6) are provided at both ends of the slot of the "I"-shaped structure.

2. The motor rotor magnetic circuit structure according to claim 1, characterized in that: The rotor punching is also provided with a fan-shaped air groove (8), and the fan-shaped air groove is located between every two adjacent "V"-shaped structures and close to the inner circle of the rotor punching.

3. The motor rotor magnetic circuit structure according to claim 2, characterized in that: A plurality of axial auxiliary grooves (7) are evenly arranged along the circumferential direction on the circumferential surface of the rotor punching sheet, and the auxiliary grooves are distributed one by one between the trapezoidal air grooves (2) and the triangular air grooves (6).

4. The motor rotor magnetic circuit structure according to claim 3, characterized in that: The angle β between the two symmetrical rectangular grooves of the "V"-shaped structure is 100 0 —110 0 The "I"-shaped structural groove occupies a polar arc angle θ of 28 0 —32 0 .

5. The motor rotor magnetic circuit structure according to claim 4, characterized in that: The inner edge of the rotor punching sheet is also provided with a spline groove (9) and a marking groove (10).

6. The motor rotor magnetic circuit structure according to claim 5, characterized in that: The rotor punching sheets (1) are stacked in a self-adhesive manner to form a rotor core (21), and the rotor (20) is designed with a four-section oblique pole structure.

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