A rotating electrical machine rotor and an electrical machine

Abstract

The present invention discloses a rotating electrical machine rotor and an electrical machine, relating to the field of electrical machines. For the rotor punching sheet of a traditional built-in permanent magnet rotating electrical machine, a design with a whole circle for the outer circle of the rotor is often adopted, which brings problems such as a large harmonic content of the air-gap magnetic density, a large cogging torque, and a large fluctuation of the load torque, thereby resulting in large noise and vibration of the electrical machine. In the rotor body of the present invention, mounting grooves are arranged around the radial outer side, permanent magnets are arranged in the mounting grooves, a plurality of outer convex arc surfaces and a plurality of grooves are arranged on the outer periphery of the rotor body, the radius of the arc surface is smaller than the distance between the distal end of the outer periphery of the rotor body and the center of the rotor body, and magnetic isolation holes are arranged on the rotor body on the outer side of each pole of the permanent magnet. By changing the outer periphery of the rotor body to an eccentric arc surface for pole cutting and groove opening, the air-gap magnetic field of the rotor can be adjusted, the sinusoidality of the air-gap magnetic field of the electrical machine can be effectively improved, the cogging torque of the electrical machine can be appropriately weakened, the performance of the electrical machine can be improved, and the noise and vibration of the electrical machine can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of motors, and particularly to a rotating motor rotor and a motor. Background Art

[0002] At present, for the rotor laminations of traditional built-in permanent magnet rotating motors, a design with a whole circle for the outer circle of the rotor or a simple design of making an eccentric circle by pole cutting of the rotor is often adopted. When the rotor is designed as a whole circle, the air gap of the motor is uniform. Although the overall average air gap magnetic density is high, the problems brought are that the harmonic content of the air gap magnetic density is large, the cogging torque is large, and the load torque fluctuation is large, which further leads to large noise and vibration of the motor; when simply making an eccentric circle by pole cutting of the rotor, although the waveform of the air gap magnetic density is relatively sinusoidal and the magnetic density harmonics and cogging torque are greatly reduced, the large-scale pole cutting of the outer circle of the rotor causes an increase in magnetic pole leakage, a significant reduction in the air gap magnetic density, and a significant decrease in the saliency ratio of the motor, which further brings a significant reduction in the output torque of the motor. Moreover, especially for concentrated winding motors, the load torque fluctuation cannot be reduced, and the noise and vibration of the motor are still large. Summary of the Invention

[0003] The technical problem to be solved and the technical task proposed by the present invention are to improve and refine the existing technical solutions, and provide a rotating motor rotor and a motor with the purpose of enhancing the air gap magnetic density of the motor and improving the motor performance. To this end, the present invention adopts the following technical solutions.

[0004] A rotating motor rotor includes a rotor body. An installation groove is arranged around the outer side in the radial direction on the rotor body, and a permanent magnet is arranged in the installation groove. A plurality of radially outwardly convex arc surfaces and a plurality of grooves are arranged on the outer periphery of the rotor body. The center of the arc surface is located on the inner side in the radial direction of the rotor body, and the radius of the arc surface is smaller than the distance between the outer end of the outer periphery of the rotor body and the center of the rotor body. A plurality of magnetic isolation holes are arranged on the rotor body outside each pole permanent magnet. By changing the outer periphery of the rotor body into a structure form of smaller eccentric arc surface pole cutting and grooving, the air gap magnetic field of the rotor can be adjusted through smaller rotor pole cutting, effectively improving the sinusoidality of the motor air gap magnetic field and appropriately weakening the cogging torque of the motor. The smaller rotor pole cutting greatly reduces the magnetic pole leakage, enhances the air gap magnetic density of the motor, improves the motor performance, enables the motor to output high power, and at the same time reduces the weakening of the Q-axis magnetic circuit, thereby increasing the saliency ratio, further increasing the magnetic reluctance torque of the motor, improving the torque density and torque value of the motor, and at the same time improving the field weakening speed increasing ability of the motor and broadening the constant power operation range of the motor. In addition, magnetic isolation holes are arranged outside the installation groove of the permanent magnet, effectively weakening the influence of the armature reaction harmonics on the fundamental magnetic field of the motor, and can well ensure the output ability of the motor while reducing the output torque fluctuation value of the motor, thereby reducing the noise and vibration of the motor.

[0005] As a preferred technical measure: The radius of the arc surface is R1, the radial symmetry line of the arc surface passes through the radial center of the rotor body, and the eccentricity between the center of the arc surface and the center of the rotor body is L1. The two satisfy the following relationship: 0 < L1 ≤ 0.25R1. Make the arc surface convex outward to achieve a smaller rotor pole cutting.

[0006] As a preferred technical measure: Each magnetic pole is provided with at least two grooves. The grooves are arranged on the arc surface and on both sides of the magnetic pole center line. By setting the grooves at appropriate positions on the arc surface, the sinusoidality of the air-gap magnetic field of the motor can be further improved, and the cogging torque of the motor can be significantly weakened.

[0007] As a preferred technical measure: Each magnetic pole is provided with two grooves, and they are symmetric about the magnetic pole center line. The connecting lines between the vertices of the two grooves and the center of the arc surface form an angle α1. The angle α1 and the number of motor poles 2p satisfy the following relationship: 0.76×360° / 2p ≤ α1 ≤ 0.95×360° / 2p. This structure and data relationship can better reduce the pole-cutting eccentricity and reduce the pole-cutting rate required for magnetic pole optimization.

[0008] As a preferred technical measure: The shapes of the grooves include V-shaped and U-shaped. The groove shapes are simple and convenient for processing.

[0009] As a preferred technical measure: The groove is V-shaped. The connecting lines between the vertex of the groove and the center of the arc surface and the two sides of the V-shaped groove form angles β1 and β2. The angles β1 and β2 satisfy the following relationship: 0.75 ≤ β1 / β2 ≤ 1.25, 120° ≤ β1 + β2 ≤ 175°. This size range has a good pole-cutting effect and can better enhance the air-gap magnetic density of the motor.

[0010] As a preferred technical measure: The maximum vertical distance between the vertex of the groove and the arc surface is d1. The maximum vertical distance d1 and the radius R1 of the arc surface satisfy the following relationship: 0.0075R1 ≤ d1 ≤ 0.02R1. This groove depth dimension can better optimize the magnetic poles.

[0011] As a preferred technical measure: At least one magnetic isolation hole is provided on the rotor body outside each pole permanent magnet. The center of the magnetic isolation hole is close to the magnetic pole center line or symmetric about the magnetic pole center line. The shapes of the magnetic isolation holes include square, triangular, and trapezoidal. It can better achieve the magnetic isolation effect, weaken the influence of the armature reaction harmonic on the fundamental magnetic field of the motor, and can better ensure the output ability of the motor while reducing the output torque fluctuation value of the motor, thereby reducing the noise and vibration of the motor.

[0012] As a preferred technical measure: There is one magnetic isolation hole. The maximum width of the magnetic isolation hole is W1, and the height in the radial direction of the rotor body is H1. They satisfy the following relationship: 1mm ≤ H1 ≤ 6mm, 0.45 ≤ H1 / W1 ≤ 0.75. The magnetic isolation effect is better.

[0013] A motor includes a rotor and a stator, and the rotor adopts a rotor of a rotary motor as described above. Compared with the prior art, the magnetic pole leakage of this motor is significantly reduced, the air-gap magnetic density of the motor is enhanced, the motor performance is higher, it can output higher power, the motor noise and vibration are lower, the field weakening and speed increasing ability of the motor is higher, and the constant power operation range of the motor is wider.

[0014] Beneficial effects: By adjusting the rotor air-gap magnetic field through a small rotor pole cutting, the sinusoidality of the motor air-gap magnetic field is effectively improved and the cogging torque of the motor is appropriately weakened. The small rotor pole cutting significantly reduces the magnetic pole leakage, enhances the air-gap magnetic density of the motor, improves the motor performance, enabling the motor to output high power; reduces the weakening of the Q-axis magnetic circuit, thereby increasing the salient pole ratio, further increasing the magnetic reluctance torque of the motor, improving the torque density and torque value of the motor, and at the same time improving the field weakening and speed increasing ability of the motor and widening the constant power operation range of the motor; magnetic isolation holes are provided outside the installation groove, effectively weakening the influence of the armature reaction harmonic on the fundamental magnetic field of the motor, which can well ensure the output ability of the motor while reducing the output torque fluctuation value of the motor, thereby reducing the motor noise and vibration. Description of the Drawings

[0015] Figure 1 is a schematic diagram of the rotor structure of the present invention.

[0016] Figure 2 is a schematic diagram of the motor structure of the present invention.

[0017] In the figure: 1 - installation groove; 2 - groove; 3 - permanent magnet; 4 - magnetic isolation hole; 5 - arc surface; 6 - rotor main body; 7 - stator. Specific Embodiments

[0018] The technical solutions of the present invention will be further described in detail below with reference to the drawings of the specification.

[0019] As Figure 1-2 shown, a rotor of a rotary motor includes a rotor main body. Six installation grooves are evenly distributed around the outer circumference of the rotor main body. Permanent magnets are provided in the installation grooves. Six radially outward convex arc surfaces and twelve grooves are provided on the outer circumference of the rotor main body. The centers of the arc surfaces are located on the inner side of the rotor main body in the radial direction. The radius of the arc surface is smaller than the distance between the outer end of the rotor main body and the center of the rotor main body. Magnetic isolation holes are provided on the rotor main body outside each pole of the permanent magnet.

[0020] In order to achieve a small rotor pole cutting, the radius of the arc surface is R1, the radial symmetry line of the arc surface passes through the radial center of the rotor main body, and the eccentricity between the center of the arc surface and the center of the rotor main body is L1. The two satisfy the following relationship: 0 < L1 ≤ 0.25R1. The arc surface is made to protrude outward to achieve a small rotor pole cutting.

[0021] To further improve the sinusoidality of the air-gap magnetic field, two grooves are arranged on each pole. The grooves are disposed on the arc surface, arranged on both sides of the pole, and symmetric about the pole center line. By setting the grooves at appropriate positions on the arc surface, the sinusoidality of the motor air-gap magnetic field can be further improved, and the cogging torque of the motor can be significantly reduced.

[0022] To better reduce the pole shaving eccentricity, the connecting lines between the vertices of the two grooves and the center of the arc surface form an angle α1. The angle α1 and the number of motor poles 2p satisfy the following relationship: 0.76×360° / 2p ≤ α1 ≤ 0.95×360° / 2p. This structure and data relationship can better reduce the pole shaving eccentricity and reduce the pole shaving rate required for pole optimization.

[0023] To obtain a better pole shaving effect, the groove is V-shaped. The connecting lines between the vertex of the groove and the center of the arc surface and the two sides of the V-shaped groove form angles β1 and β2. The angles β1 and β2 satisfy the following relationship: 0.75 ≤ β1 / β2 ≤ 1.25, 120° ≤ β1 + β2 ≤ 175°. This size range has a good pole shaving effect and can better enhance the air-gap magnetic density of the motor.

[0024] To better optimize the pole, the maximum vertical distance between the vertex of the groove and the arc surface is d1. The maximum vertical distance d1 and the arc surface radius R1 satisfy the following relationship: 0.0075R1 ≤ d1 ≤ 0.02R1. This groove depth dimension can better optimize the pole.

[0025] To obtain a better magnetic isolation effect, one magnetic isolation hole is provided on the rotor body outside each pole permanent magnet. The center of the magnetic isolation hole is close to the pole center line, and the shape of the magnetic isolation hole is trapezoidal. It can better achieve the magnetic isolation effect, weaken the influence of the armature reaction harmonic on the fundamental magnetic field of the motor, and can better ensure the output capacity of the motor while reducing the output torque fluctuation value of the motor, thereby reducing the motor noise and vibration.

[0026] To obtain a better magnetic isolation effect, the maximum width of the magnetic isolation hole is W1, and the height in the radial direction of the rotor body is H1, satisfying the following relationship: 1mm ≤ H1 ≤ 6mm, 0.45 ≤ H1 / W1 ≤ 0.75. The magnetic isolation effect is better.

[0027] As Figure 2 shown, a motor includes a rotor and a stator, and the rotor adopts a rotor of a rotating motor in the above example.

[0028] By changing the outer circumference of the rotor body to a structure with a smaller eccentric arc surface for pole shaping and groove opening, the air-gap magnetic field of the rotor can be adjusted with a smaller rotor pole shaping, effectively improving the sinusoidality of the air-gap magnetic field of the motor and appropriately weakening the cogging torque of the motor. The smaller rotor pole shaping can significantly reduce magnetic pole leakage, enhance the air-gap magnetic density of the motor, improve the motor performance, enable the motor to output high power, while reducing the weakening of the Q-axis magnetic circuit, thereby increasing the salient pole ratio, further increasing the magnetic reluctance torque of the motor, improving the torque density and torque value of the motor, while improving the field weakening speed increasing ability of the motor, broadening the constant power operation range of the motor. In addition, magnetic isolation holes are provided on the outer side of the installation groove of the permanent magnet, effectively weakening the influence of the armature reaction harmonic on the fundamental magnetic field of the motor, which can well ensure the output ability of the motor while reducing the output torque fluctuation value of the motor, thereby reducing the motor noise and vibration.

[0029] In this embodiment, the groove can be replaced by a U shape, and the shape of the magnetic isolation hole can be replaced by a square or a triangle.

[0030] In this embodiment, the rotor body is laminated by soft magnetic material sheets.

[0031] In this embodiment, the polarities of adjacent permanent magnets facing the outer circumference side of the rotor are opposite.

[0032] In this embodiment, the magnetic isolation holes can also be symmetrically arranged along the center line of the magnetic poles.

[0033] The above Figure 1-2 The rotor of a rotating electrical machine and the electrical machine shown above are specific embodiments of the present invention, which have already reflected the prominent substantial features and remarkable progress of the present invention. According to the actual use needs, under the inspiration of the present invention, equivalent modifications can be made to its shape, structure, etc., and all are within the protection scope of this solution.

Claims

1. A rotating electrical machine rotor, characterized in that: It includes a rotor body (6), an installation groove (1) is arranged around the outer side in the radial direction on the rotor body (6), a permanent magnet (3) is arranged in the installation groove (1), a plurality of radially protruding arc surfaces (5) and a plurality of grooves (2) are arranged on the outer circumference of the rotor body (6), the center of the arc surface (5) is located on the inner side in the radial direction of the rotor body (6), the radius of the arc surface (5) is smaller than the distance between the outer end of the outer circumference of the rotor body (6) and the center of the rotor body (6), at least one magnetic isolation hole (4) is arranged on the rotor body (6) outside each pole permanent magnet (3); the groove (2) is V-shaped, and the angles β1 and β2 are formed between the connection line of the vertex of the groove (2) and the center of the arc surface (5) and the two sides of the V-shaped groove (2), and the angles β1 and β2 satisfy the following relationship: 0.75≤β1 / β2≤1.25，120°≤β1+β2≤175°； Two grooves (2) are arranged for each magnetic pole and are symmetrical about the magnetic pole center line; The maximum vertical distance between the vertex of the groove (2) and the arc surface (5) is d1, and the maximum vertical distance d1 and the radius R1 of the arc surface (5) satisfy the following relationship: 0.0075R1 ≤ d1 ≤ 0.02R1.

2. The rotating electrical machine rotor according to claim 1, characterized in that: The radius of the arc surface (5) is R1, the radial symmetry line of the arc surface (5) passes through the radial center of the rotor body (6), the eccentricity between the center of the arc surface (5) and the center of the rotor body (6) is L1, and the two satisfy the following relationship: 0 < L1 ≤ 0.25R1.

3. The rotating electrical machine rotor according to claim 2, characterized in that: At least two grooves (2) are arranged for each magnetic pole, and the grooves (2) are arranged on the arc surface (5) and are arranged on both sides of the magnetic pole center line.

4. The rotating electrical machine rotor according to claim 3, characterized in that: The connection lines of the vertices of the two grooves (2) and the center of the arc surface (5) form an angle α1, and the angle α1 and the number of motor poles 2p satisfy the following relationship: 0.76×360° / 2p ≤ α1 ≤ 0.95×360° / 2p.

5. The rotating electrical machine rotor according to claim 1, characterized in that: At least one magnetic isolation hole (4) is arranged on the rotor body (6) outside each pole permanent magnet (3), the center of the magnetic isolation hole (4) is close to the magnetic pole center line or is symmetrical about the magnetic pole center line, and the shape of the magnetic isolation hole (4) is square, triangular or trapezoidal.

6. The rotating electrical machine rotor according to claim 1, characterized in that: The magnetic isolation hole (4) is one, the maximum width of the magnetic isolation hole (4) is W1, and the height in the radial direction of the rotor body (6) is H1, and they satisfy the following relationship: 1mm ≤ H1 ≤ 6mm, 0.45 ≤ H1 / W1 ≤ 0.

75.

7. An electrical machine, comprising a rotor and a stator (7), characterized in that: The rotor is a rotating electric machine rotor according to any one of claims 1-6.

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