Synchronous reluctance motor rotor and synchronous reluctance motor

Abstract

The invention relates to the technical field of motors, in particular to a synchronous reluctance motor rotor and a synchronous reluctance motor, the synchronous reluctance motor rotor comprises a rotor core, a plurality of magnetic barrier layer groups are arranged on the rotor core, the plurality of magnetic barrier layer groups are uniformly distributed along the circumferential direction of the rotor core, and each magnetic barrier layer group comprises a plurality of magnetic barrier layers arranged at intervals along the Q-axis direction; the magnetic barrier layers are asymmetrically arranged on the rotor core relative to the Q axis and are divided into strong magnetic resistance sides and weak magnetic resistance sides, and the strong magnetic resistance sides and the weak magnetic resistance sides in the plurality of groups of magnetic barrier layers are alternately distributed along the extension path of the magnetic barrier layers so as to form a magnetic flux path of an S structure. According to the invention, the characteristic that the magnetic flux is always closed along the path with the minimum magnetic resistance in the synchronous reluctance motor is utilized, and the strong magnetic resistance sides and the weak magnetic resistance sides in the plurality of groups of magnetic barrier layers are alternately distributed to form the magnetic flux path of the S structure, so that the magnetic flux is more concentrated and uniform, and the S-shaped structure can reduce the torque pulsation caused by the non-uniform magnetic field.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, in particular to a synchronous reluctance motor rotor and a synchronous reluctance motor having the synchronous reluctance motor rotor. Background Art

[0002] With the continuous improvement of industrial automation level and increasingly stringent requirements for energy efficiency, efficient and reliable motors have become an important part of modern industrial development; synchronous reluctance motors stand out among many types of motors due to their high efficiency, simple structure, low cost and other advantages, and have gradually become one of the ideal choices to replace traditional induction motors; synchronous reluctance motors are an AC motor that works on the principle of minimum reluctance; its working principle is based on the interaction between the rotating magnetic field generated by the stator and the reluctance distribution of the rotor; when the stator winding is energized, a rotating magnetic field is generated, which attempts to minimize the reluctance in the rotor, thereby driving the rotor to rotate synchronously with the rotating magnetic field.

[0003] The rotor of a synchronous reluctance motor is usually made of stacked silicon steel sheets, and specific slots or holes are designed on the rotor core. The shape and arrangement of these slots or holes will affect the reluctance distribution and mechanical strength of the motor. Summary of the invention

[0004] The present invention aims at solving the problems in the prior art and provides a synchronous reluctance motor rotor and a synchronous reluctance motor. The specific technical solutions are as follows:

[0005] On the one hand, the present application provides a synchronous reluctance motor rotor, including a rotor core, wherein a plurality of magnetic barrier layer groups are arranged on the rotor core, wherein the plurality of magnetic barrier layer groups are evenly distributed along the circumference of the rotor core, and the magnetic barrier layer groups include a plurality of magnetic barrier layers spaced apart along the Q-axis direction;

[0006] The magnetic barrier layer is asymmetrically arranged relative to the Q axis on the rotor core and is divided into a strong magnetic resistance side and a weak magnetic resistance side. Along the extension path of the magnetic barrier layer, the strong magnetic resistance side and the weak magnetic resistance side in several groups of magnetic barrier layers are alternately distributed to form an S-structured magnetic flux path.

[0007] As a further technical solution of the present invention, in any magnetic barrier layer, the distance between the strong magnetic resistance side and the outer edge of the rotor core is A1, and the distance between the weak magnetic barrier layer and the outer edge of the rotor core is A2, and A2>A1.

[0008] As a further technical solution of the present invention, along the circumferential path of the magnetic barrier layer, the width decreases from the strong magnetic resistance side to the weak magnetic resistance side.

[0009] As a further technical solution of the present invention, in any magnetic barrier layer, an auxiliary magnetic block is installed on the side of the weak magnetic resistance facing the outer edge of the rotor core.

[0010] As a further technical solution of the present invention, the distances between two adjacent magnetic barrier layers are the same.

[0011] As a further technical solution of the present invention, the strong magnetic resistance side is in an arc-shaped structure on the side facing the outer edge of the rotor core.

[0012] As a further technical solution of the present invention, the strong magnetic resistance side extends toward one side of the outer edge until a gap is formed.

[0013] As a further technical solution of the present invention, the rotor core is an integral structure formed by punching.

[0014] As a further technical solution of the present invention, the rotor core axis is provided with a central axis hole, and the central axis hole has a radially extending keyway.

[0015] On the other hand, the present application also provides a synchronous reluctance motor, including the above-mentioned synchronous reluctance motor rotor.

[0016] The beneficial effects of the present invention are as follows:

[0017] (1) In the present application, the characteristic of a synchronous reluctance motor that the magnetic flux is always closed along the path with the smallest magnetic resistance is utilized, so that the magnetic barrier layer is asymmetrically arranged relative to the Q axis on the rotor core and is divided into a strong magnetic resistance side and a weak magnetic resistance side, and the strong magnetic resistance side and the weak magnetic resistance side in several groups of magnetic barrier layers are alternately distributed to form an S-structured magnetic flux path, so that the magnetic flux is more concentrated and uniform, which helps to reduce magnetic flux leakage and improve the efficiency of the motor. By optimizing the magnetic flux path, the S-shaped structure can reduce the torque pulsation caused by the uneven magnetic field.

[0018] (2) In the present application, the magnetic resistance gap between the strong magnetic resistance side and the weak magnetic resistance side is further enlarged by gradually reducing the width of the circumferential path from the strong magnetic resistance side to the weak magnetic resistance side and installing auxiliary magnetic blocks on the weak magnetic barrier layer, thereby increasing the guidance of the magnetic flux path. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of the rotor core is shown;

[0020] Figure 2 A schematic diagram of the structure of a magnetic barrier layer group is shown;

[0021] Figure 3 A schematic diagram of the distribution structure of the magnetic barrier layer is shown;

[0022] Figure 4 is a schematic diagram of the magnetic flux path structure;

[0023] Figure 5 A schematic diagram of the circumferential extension structure of the magnetic barrier layer is shown;

[0024] Figure 6A distribution diagram of the auxiliary magnetic blocks is shown.

[0025] Description of the drawings: 100, rotor core; 110, center axis hole; 111, keyway; 200, magnetic barrier layer group; 210, magnetic barrier layer one; 211, strong magnetic resistance side one; 212, weak magnetic resistance side one; 213, auxiliary magnetic block one; 220, magnetic barrier layer two; 221, strong magnetic resistance side two; 222, weak magnetic resistance side two; 223, auxiliary magnetic block two; 230, magnetic barrier layer three; 231, strong magnetic resistance side three; 232, weak magnetic resistance side three; 233, auxiliary magnetic block three. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0027] Figure 1 A schematic diagram of the structure of the rotor core is shown; Figure 1 In the embodiment, the synchronous reluctance motor rotor comprises a rotor core 100, wherein the rotor core 100 is provided with a central axis hole 110 at its axis, and the central axis hole 110 has a radially extending keyway 111; in actual installation, after the central axis passes through the central axis hole 110, it is convenient to align the protrusion on the central axis with the keyway 111 for installation, and the central axis can be used to drive the rotor core 100 to rotate synchronously; the rotor core 100 is provided with a plurality of magnetic barrier layer groups 200, and the plurality of magnetic barrier layer groups 200 are evenly distributed along the circumference of the rotor core 100; it should be noted that the number of the magnetic barrier layer groups 200 is an even number, for example Figure 1 There are four groups in the figure, so that any magnetic barrier layer group 200 has another magnetic barrier layer group 200 that is symmetrical relative to the axis center, so that the two magnetic poles are arranged relatively to each other, so that the rotor core 100 can cooperate with the external stator to form a magnetic pole structure with alternating S poles and N poles when rotating in any direction; the rotor core 100 is an integrated structure formed by punching to ensure the mechanical strength of the rotor core 100 and to avoid jitter of the rotor core 100 when rotating at high speed.

[0028] Figure 2The schematic diagram of the structure of the magnetic barrier layer group 200 is shown; the magnetic barrier layer group 200 includes a plurality of groups of magnetic barrier layers arranged at intervals along the Q-axis direction; it should be noted here that the Q-axis refers to the cross axis in the dq coordinate system, which is located in the radial position, that is, the plurality of groups of magnetic barrier layers are distributed in the radial direction; the plurality of groups of magnetic barrier layers can be used to guide and control the magnetic flux path inside the motor, improve the magnetic flux distribution of the motor, and optimize the magnetic flux path, thereby improving the working efficiency and output torque of the motor and enhancing the magnetic resistance effect of the motor, that is, achieving different magnetic resistance characteristics in different directions by changing the rotor material and structure, which is the basis for the operation of the synchronous reluctance motor; Example: the magnetic barrier layers are provided with three groups, including magnetic barrier layer one 210, magnetic barrier layer two 220 and magnetic barrier layer three 230 from the inside to the outside, that is, the magnetic path will bypass the area where the magnetic barrier layer one 210, magnetic barrier layer two 220 and magnetic barrier layer three 230 are located, thereby achieving the purpose of controlling the magnetic path.

[0029] Figure 3 A schematic diagram of the distribution structure of the magnetic barrier layer is shown; Figure 3 In the embodiment, the magnetic barrier layer is asymmetrically arranged on the rotor core 100 relative to the Q axis and is divided into a strong magnetic resistance side and a weak magnetic resistance side. Along the extension path of the magnetic barrier layer, the strong magnetic resistance side and the weak magnetic resistance side in several groups of magnetic barrier layers are alternately distributed to form an S-structured magnetic flux path; this is because in a synchronous reluctance motor, the magnetic flux is always closed along the path with the smallest magnetic resistance, so the magnetic flux path will inevitably move along the weak magnetic resistance side. In this way, the strong magnetic resistance side and the weak magnetic resistance side are alternately distributed during the extension and layout of several magnetic barrier layers, which can force the magnetic flux path to present an S structure, making the magnetic flux more concentrated and uniform, which helps to reduce Flux leakage improves the efficiency of the motor. By optimizing the flux path, the S-shaped structure can reduce the torque pulsation caused by the uneven magnetic field, which makes the motor more stable during operation and reduces vibration and noise. The S-shaped structure can increase the length of the effective flux path, thereby improving the torque density of the motor, which means that the motor can output a larger torque at the same volume and weight; and, since the overall strength of the weak magnetic resistance side is higher, when the weak magnetic resistance side is alternately distributed, the overall mechanical strength of the rotor core 100 can be improved; the spacing between two adjacent magnetic barrier layers is the same; it is conducive to a more uniform distribution of the magnetic field.

[0030] Example: Continue to see Figure 3 , combined with Figure 4 , Figure 4Schematic diagram of the magnetic flux path structure; relative to the Q axis, the magnetic barrier layer 1 210 is separated into a strong magnetic resistance side 1 211 and a weak magnetic resistance side 1 212, the magnetic barrier layer 2 220 is separated into a strong magnetic resistance side 2 221 and a weak magnetic resistance side 2 222, and the magnetic barrier layer 3 230 is separated into a strong magnetic resistance side 3 231 and a weak magnetic resistance side 3 232. Since the weak magnetic resistance side 3 232, the weak magnetic resistance side 2 222 and the weak magnetic resistance side 1 212 are alternately distributed along both sides of the Q axis, that is, the magnetic flux path is the weak magnetic resistance side 3 232, the weak magnetic resistance side 2 222 and the weak magnetic resistance side 1 212.

[0031] Continue to see Figure 4 In any magnetic barrier layer, the distance between the strong magnetic resistance side and the outer edge of the rotor core 100 is A1, and the distance between the weak magnetic barrier layer and the outer edge of the rotor core 100 is A2, A2>A1; that is to say, the weak magnetic barrier layer has a wider space to form a flow path, while the strong magnetic barrier layer can better block the magnetic path and reduce magnetic leakage.

[0032] In one embodiment, the strong magnetic resistance side is in an arc-shaped structure facing the outer edge of the rotor core 100; this is to make the strong magnetic barrier layer closer to the outer edge of the rotor core 100 while ensuring strength.

[0033] In another embodiment, the strong magnetic resistance side extends toward one side of the outer edge portion until a gap is formed; this can block the magnetic flux to the maximum extent.

[0034] Figure 5 A schematic diagram of the circumferential extension structure of the magnetic barrier layer is shown; Figure 5 In the circumferential path of the magnetic barrier layer, the width of the strong magnetic resistance side decreases toward the weak magnetic resistance side; the decreasing width design can make the magnetic flux pass through the weak magnetic resistance side more concentratedly, reduce the leakage on the strong magnetic resistance side, help reduce the torque pulsation, and improve the running stability of the motor; Example: in Figure 5 , the width D1 at any position on the strong magnetic resistance side is greater than the width D2 at any position on the weak magnetic resistance side.

[0035] Figure 6 shows the distribution diagram of the auxiliary magnetic blocks; Figure 6 In any magnetic barrier layer, an auxiliary magnetic block is installed on the side of the weak magnetic resistance side facing the outer edge of the rotor core 100; the auxiliary magnetic block is a permanent magnet, which is conducive to concentrating the magnetic field there and can better guide the magnetic flux; example: the weak magnetic resistance side 1 212 is equipped with an auxiliary magnetic block 1 213 on the side away from the strong magnetic resistance side 1 211, the weak magnetic resistance side 2 222 is equipped with an auxiliary magnetic block 2 223 on the side away from the strong magnetic resistance side 2 221, and the weak magnetic resistance side 3 232 is equipped with an auxiliary magnetic block 3 233 on the side away from the strong magnetic resistance side 3 231. The arrangement of the auxiliary magnetic block 1 213, the auxiliary magnetic block 2 223 and the auxiliary magnetic block 3 233 can help to concentrate the magnetic field distribution.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A synchronous reluctance motor rotor, comprising a rotor core (100), wherein a plurality of magnetic barrier layer groups (200) are arranged on the rotor core (100), and the plurality of magnetic barrier layer groups (200) are evenly distributed along the circumference of the rotor core (100), characterized in that: The magnetic barrier layer group (200) comprises a plurality of groups of magnetic barrier layers arranged at intervals along the Q-axis direction; The magnetic barrier layer is asymmetrically arranged relative to the Q axis on the rotor core (100) and is divided into a strong magnetic resistance side and a weak magnetic resistance side. Along the extension path of the magnetic barrier layer, the strong magnetic resistance side and the weak magnetic resistance side in a plurality of groups of magnetic barrier layers are alternately distributed to form a magnetic flux path with an S structure.

2. The synchronous reluctance motor rotor according to claim 1, characterized in that: In any magnetic barrier layer, the distance between the strong magnetic resistance side and the outer edge of the rotor core (100) is A1, and the distance between the weak magnetic barrier layer and the outer edge of the rotor core (100) is A2, and A2>A1.

3. The synchronous reluctance motor rotor according to claim 2, characterized in that: Along the circumferential path of the magnetic barrier layer, the width decreases from the strong magnetic resistance side to the weak magnetic resistance side.

4. The synchronous reluctance motor rotor according to claim 2, characterized in that: In any magnetic barrier layer, an auxiliary magnetic block is installed on the side of the weak magnetic resistance facing the outer edge of the rotor core (100).

5. The synchronous reluctance motor rotor according to claim 4, characterized in that: The distance between two adjacent magnetic barrier layers is the same.

6. The synchronous reluctance motor rotor according to claim 5, characterized in that: The strong magnetic resistance side is in an arc-shaped structure on the side facing the outer edge of the rotor core (100).

7. The synchronous reluctance motor rotor according to claim 5, characterized in that: The ferromagnetic resistance side extends toward one side of the outer edge portion until a notch is formed.

8. The synchronous reluctance motor rotor according to claim 5, characterized in that: The rotor core (100) is an integrated structure formed by punching.

9. The synchronous reluctance motor rotor according to claim 8, characterized in that: The rotor core (100) is provided with a central axis hole (110) at its axis, and the central axis hole (110) has a radially extending keyway (111).

10. A synchronous reluctance motor, characterized in that: It comprises the synchronous reluctance motor rotor as described in any one of claims 1 to 9.

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