Self-starting synchronous reluctance rotor and rotor-stator structure

Abstract

The utility model discloses a kind of self-starting synchronous reluctance rotor and rotor structure, rotor core is set from inside to outside center shaft hole, first magnetic barrier cavity, second magnetic barrier cavity, support rib and squirrel cage slot, first magnetic barrier cavity, second magnetic barrier cavity and support rib are distributed in d-axis two sides, first magnetic barrier cavity forms first magnetic yoke between, second magnetic yoke is formed between adjacent first magnetic barrier cavity and second magnetic barrier cavity respectively, first magnetic barrier cavity has arc winding cavity section and first straight cavity section, second magnetic barrier cavity has arc avoiding cavity section and second straight cavity section, in the squirrel cage slot that each support rib of abutting is formed H-shaped continuous conductor slot group through circumferential groove through respectively, the width between first straight cavity section is greater than the width between arc winding cavity section and center shaft hole;Second magnetic yoke of equal width is greater than the width between arc winding cavity section and center shaft hole and less than the width between first straight cavity section.The utility model rotor forming quality is good, reduces motor operating current, improves power factor and promotes motor efficiency.

Description

Technical Field

[0001] This utility model relates to the field of self-starting synchronous reluctance motor technology, specifically to a self-starting synchronous reluctance rotor and stator-rotor structure. Background Technology

[0002] In existing linear two-pole self-starting synchronous reluctance motor rotors, the slit magnetic barrier cavity is typically a multi-layered structure with up to five layers. The rotor core has squirrel cage slots and slit magnetic barrier cavities arranged in the same layer, with one squirrel cage slot corresponding to each end of each slit magnetic barrier cavity. However, the slit magnetic barrier cavity rotor core structure results in a large operating current and a low power factor, leading to low motor efficiency. Because the squirrel cage slots must be arranged in the same layer as the slit magnetic barrier cavity, the number of slots is relatively small, limiting the increase in output power of the self-starting synchronous reluctance motor. Furthermore, the two ends of the five-layer slit magnetic barrier cavity need to be separated by magnetic bridges; an excessive number of magnetic bridges increases the difficulty of lamination stamping and riveting. The multi-layer magnetic barrier structure not only affects structural strength during lamination stamping but also easily leads to rotor deformation, thus affecting the forming quality. Utility Model Content

[0003] The purpose of this invention is to provide a self-starting synchronous reluctance rotor with good molding quality, which solves the problem of low motor efficiency caused by excessive motor operating current and low power factor in existing linear two-pole self-starting synchronous reluctance motor rotors.

[0004] Therefore, this utility model relates to a self-starting synchronous reluctance rotor, including a rotor core. The rotor core has a central shaft hole, a first magnetic barrier cavity, a second magnetic barrier cavity, support ribs, and squirrel cage slots arranged from the inside out. The first magnetic barrier cavity, the second magnetic barrier cavity, and the support ribs are respectively arranged on both sides of the d-axis. A first magnetic yoke is formed between the first magnetic barrier cavities, and a second magnetic yoke is formed between adjacent first and second magnetic barrier cavities. The squirrel cage slots are radially arranged along the outer edge of the rotor core and circumferentially spaced. Each first magnetic barrier cavity consists of an arc-shaped axial cavity segment and a first straight cavity segment connecting the arc-shaped axial cavity segment. The second magnetic barrier cavity is composed of an arc-shaped clearance cavity segment and a second straight cavity segment connecting the arc-shaped clearance cavity segment. In the rat cage slot, the rat cage slots adjacent to each supporting rib are connected by circumferential slots to form an H-shaped integrated conductor slot group. The width of the first magnetic yoke between the first straight cavity segments is greater than the width between the arc-shaped axial cavity segment and the central shaft hole. The second magnetic yoke is of equal width, and the width of the second magnetic yoke is greater than the width of the first magnetic yoke between the arc-shaped axial cavity segment and the central shaft hole but less than the width between the first straight cavity segments. The arc-shaped axial cavity segment, the arc-shaped clearance cavity segment and the central shaft hole are concentric.

[0005] The first magnetic barrier cavity is of equal width and is equal to the bottom width of the squirrel cage groove; the width of the second straight cavity section of the second magnetic barrier cavity is equal to the sum of the width of one rotor tooth and the bottom width of two squirrel cage grooves, and the width of the arc-shaped clearance cavity section is not greater than the width of the first magnetic barrier cavity.

[0006] The width of the second magnetic yoke is equal to the sum of the widths of the bottom of the two rotor teeth and the squirrel cage slot; the width of the first magnetic yoke located between the first straight cavity segments is equal to the sum of the widths of the bottoms of the three rotor teeth and the two squirrel cage slots.

[0007] Furthermore, let the width of the arc-shaped axial cavity segment be c1, the width of the arc-shaped clearance cavity segment be c2, the width of the first magnetic yoke located between the arc-shaped axial cavity segment and the central shaft hole be w1, the width of the second magnetic yoke be w2, and the ratio of c1+c2 to w1+w2 be z, where z = 0.5~0.6.

[0008] Each of the first straight cavity segments in the first magnetic barrier cavity is separated from a corresponding rat cage slot by a first magnetic bridge, and each of the second straight cavity segments in the second magnetic barrier cavity is separated from two adjacent rat cage slots by a second magnetic bridge.

[0009] The bottom of the aforementioned rat cage trough is flat while the top is convex and curved, with the height between the bottom and top of the trough ranging from 3 to 5.2 mm.

[0010] The total number of the above-mentioned rat cage slots is 32 to 40 and is an even number, of which each H-shaped integrated conductor slot group has 4 to 8 rat cage slots.

[0011] Another aspect of this utility model relates to a stator-rotor structure, including a rotor, a stator core, and a stator winding wound in the stator slots of the stator core. The rotor is the aforementioned self-starting synchronous reluctance rotor, and the stator winding is made of copper enameled wire, aluminum enameled wire, or copper-clad aluminum enameled wire.

[0012] This utility model has the following advantages and positive effects:

[0013] 1. Compared with the traditional linear two-pole self-starting synchronous reluctance motor rotor, the widening design of the second straight cavity section helps to reduce the motor operating current and improve the power factor, thereby improving the efficiency of the motor using the technical solution of this utility model.

[0014] 2. Based on the unequal width structure of the second magnetic barrier cavity, combined with the design of support ribs, the rotor manufacturing process is conducive to ensuring the structural strength of the H-shaped integrated conductor slot group in the q-axis direction during the aluminum casting process. This effectively curbs the radial inward thermal extrusion deformation of the H-shaped integrated conductor slot group, thereby improving the forming quality of the rotor. While ensuring the mechanical strength of the rotor, the increased filling volume of the H-shaped integrated conductor slot group can improve the motor starting performance, increase the motor's magnetic reluctance torque, and improve the motor efficiency.

[0015] 3. The rotor core of the two-pole self-starting synchronous reluctance motor is equipped with a pair of two-layer first and second magnetic barrier cavities, which allows for more squirrel cage slots to be set under the same volume conditions, thereby increasing the output power of the motor. Attached Figure Description

[0016] Figure 1 This is a perspective view of the self-starting synchronous reluctance rotor of this utility model;

[0017] Figure 2 This is a perspective view of a rotor core of this utility model (there are 8 squirrel cage slots in each H-shaped integrated conductor slot group);

[0018] Figure 3 This is a perspective view of another rotor core of this utility model (there are 4 squirrel cage slots in each H-shaped integrated conductor slot group);

[0019] Figure 4 yes Figure 2 A diagram showing the end face of the rotor core;

[0020] Figure 5 yes Figure 3 A diagram showing the end face of the rotor core;

[0021] Figure 6 This is a schematic diagram of the stator and rotor structure of this utility model. Detailed Implementation

[0022] Please see Figures 1-5As shown, this utility model provides a self-starting synchronous reluctance rotor, including a rotor core 1, guide bars (not shown) and end rings 9 connected to both ends of the rotor core. The rotor core is provided with a central shaft hole 10, a first magnetic barrier cavity 2, a second magnetic barrier cavity 4, a support rib 7 and a squirrel cage slot 6 from the inside out. The first magnetic barrier cavity 2, the second magnetic barrier cavity 4 and the support rib 7 are respectively arranged on both sides of the d-axis 81. A first magnetic yoke 3 is formed between the first magnetic barrier cavities 2, and a second magnetic yoke 5 is formed between adjacent first magnetic barrier cavities 2 and second magnetic barrier cavities 4. The squirrel cage slots 6 are arranged radially along the outer edge of the rotor core 1 and are circumferentially spaced. The circumferential spacing between the squirrel cage slots 6 is equal, the slot bottom width is equal and the slot height is equal. Each first magnetic barrier cavity 2 is composed of an arc-shaped axial cavity segment 20 and a first straight cavity segment 21 connected to the arc-shaped axial cavity segment. Each second magnetic barrier cavity 4 is composed of an arc-shaped clearance cavity segment 40 and a second straight cavity segment 41 connected to the arc-shaped clearance cavity segment. The first straight cavity segment 21 and the second straight cavity segment 41 are parallel to the d-axis 81. The squirrel cage slots connected to each supporting rib 7 in the entire squirrel cage slot 6 are connected by circumferential slots 6-1, thereby forming an H-shaped integrated conductor slot group 6'. The H-shaped integrated conductor slot group is arranged on both sides of the d-axis. During rotor manufacturing, the supporting ribs 7 can prevent the H-shaped integrated conductor slot group from deforming radially inward in the q-axis 82 direction. The width w'1 of the first magnetic yoke 3 between the first straight cavity segments 21 is greater than the width w1 between the arc-shaped axial cavity segment 20 and the central shaft hole 10; the second magnetic yoke 5 is of equal width, and the width w2 of the second magnetic yoke 5 is greater than the width w1 of the first magnetic yoke 3 between the arc-shaped axial cavity segment 20 and the central shaft hole 10 and less than the width w'1 of the first magnetic yoke 3 between the first straight cavity segments 21; the center of the arc-shaped axial cavity segment 20 and the center of the arc-shaped clearance cavity segment 40 are concentric with the center of the central shaft hole 10. The first magnetic barrier cavity 2 is designed with equal width, and the width of the first magnetic barrier cavity 2 and the bottom 61 of the squirrel cage slot 6 are equal in width; the width c'2 of the second straight cavity segment 41 is equal to the sum of the width of one rotor tooth 11 and the width of the bottom 61 of the two squirrel cage slots 6, and the width c2 of the arc-shaped clearance cavity segment 40 is less than or equal to the width c1 of the first magnetic barrier cavity 2. When the width of the second straight cavity section is optimized, it not only provides excellent magnetic shielding but also reduces the motor's operating current and improves the power factor. However, exceeding this optimized width will result in an excessively large span of the second magnetic bridge, causing excessive stress during aluminum molten casting and leading to deformation of the squirrel cage slots. The width w'1 of the first magnetic yoke 3 located between the first straight cavity sections 21 is equal to the sum of the widths of the bottom 61 of the three rotor teeth 11 and the two squirrel cage slots 6; the width of the second magnetic yoke 5 is equal to the sum of the widths of the bottom 61 of the two rotor teeth 11 and the squirrel cage slot 6.

[0023] The width of the arc-shaped axial cavity 20 (i.e., the width of the first magnetic barrier cavity 2) is c1, the width of the arc-shaped clearance cavity 40 is c2, the width of the first magnetic yoke 3 located between the arc-shaped axial cavity 20 and the central shaft hole 10 is w1, and the width of the second magnetic yoke 5 is W2. The ratio of c1+c2 to w1+w2 is z, where z is between 0.5 and 0.6. A reasonable damping ratio helps to reduce the excitation current, thereby improving motor efficiency.

[0024] The first straight cavity section 21 of each of the first magnetic barrier cavities 2 is separated from a corresponding squirrel cage slot 6 by a first magnetic bridge 11; the second straight cavity section 41 of each of the second magnetic barrier cavities 4 is separated from two adjacent squirrel cage slots 6 by a second magnetic bridge 12. Based on the rotor core having a pair of two-layered first and second magnetic barrier cavities, ... Figure 4 , 5 It is evident that reducing the number of magnetic bridges (as few as eight) reduces the structural complexity and manufacturing difficulty of the rotor core of the two-pole self-starting synchronous reluctance motor.

[0025] The squirrel cage slot 6 has a gentle bottom 61 and a convex arc-shaped top (not shown), with the slot height between the bottom 61 and the top ranging from 3 to 5.2 mm. Finite element simulation verification shows that both excessively large and small slot heights are detrimental to reducing the excitation current.

[0026] The number of squirrel cage slots 6 is 32 to 40 and is an even number, of which each H-shaped integrated conductor slot group 6' has 4 to 8 squirrel cage slots 6. Increasing the number of squirrel cage slots in a rotor core of the same volume can improve the motor's output power and efficiency. In a specific implementation, the H-shaped integrated conductor slot group 6' is, as one embodiment, in... Figure 2 , Figure 4 In each of the H-shaped integrated conductor slot groups 6' shown, there are eight squirrel cage slots 6, and the rotor core 1 has a total of 40 squirrel cage slots 6; as another embodiment, in Figure 3 , 5 In each of the H-shaped interconnected conductor slot groups 6' shown, there are four squirrel cage slots 6, and at that time the total number of squirrel cage slots 6 of the rotor core 1 is 32.

[0027] During rotor manufacturing, molten aluminum is poured in, and after the aluminum cools, end rings 9 are fixed at both ends of the rotor core, and guide bars are formed in the squirrel cage slots 6. In the H-shaped integrated conductor slot group 6', guide bars are formed not only in the squirrel cage slots 6 but also in the circumferential slots 6-1, and all the guide bars are integrally formed with the end rings 9.

[0028] The self-starting synchronous reluctance rotor is applied in the field of self-starting synchronous reluctance motor technology, that is, according to another aspect of this utility model, see [link to other invention]. Figure 6As shown, a stator and rotor structure is provided, including a rotor, a stator core S1, and a stator winding S2 wound in the stator slot S10 of the stator core S1. The rotor is the self-starting synchronous reluctance rotor mentioned above, and the stator winding S2 is made of copper enameled wire, aluminum enameled wire, or copper-clad aluminum enameled wire.

Claims

1. A self-starting synchronous reluctance rotor, characterized in that: The rotor core includes a central shaft hole, a first magnetic barrier cavity, a second magnetic barrier cavity, support ribs, and squirrel cage slots arranged from the inside out. The first magnetic barrier cavity, the second magnetic barrier cavity, and the support ribs are respectively arranged on both sides of the d-axis. A first magnetic yoke is formed between the first magnetic barrier cavities, and a second magnetic yoke is formed between adjacent first and second magnetic barrier cavities. The squirrel cage slots are arranged radially along the outer edge of the rotor core and are circumferentially spaced. The first magnetic barrier cavity is composed of an arc-shaped axial cavity segment and a first straight cavity segment connecting the arc-shaped axial cavity segment. The second magnetic barrier cavity is composed of an arc-shaped clearance cavity segment and a second straight cavity segment connecting the arc-shaped clearance cavity segment. In the rat cage slots, the rat cage slots adjacent to each supporting rib are connected by circumferential slots to form an H-shaped integrated conductor slot group. The width of the first magnetic yoke between the first straight cavity segments is greater than the width between the arc-shaped axial cavity segment and the central shaft hole; the second magnetic yoke is of equal width, and the width of the second magnetic yoke is greater than the width of the first magnetic yoke between the arc-shaped axial cavity segment and the central shaft hole but less than the width between the first straight cavity segments; the arc-shaped axial cavity segment, the arc-shaped clearance cavity segment and the central shaft hole are concentric.

2. The self-starting synchronous reluctance rotor according to claim 1, characterized in that: The first magnetic barrier cavity is of equal width and is equal to the bottom width of the rat cage slot; the width of the second straight cavity section of the second magnetic barrier cavity is equal to the sum of the width of one rotor tooth and the bottom width of two rat cage slots, and the width of the arc-shaped clearance cavity section is not greater than the width of the first magnetic barrier cavity.

3. The self-starting synchronous reluctance rotor according to claim 1, characterized in that: The width of the second magnetic yoke is equal to the sum of the widths of the bottom of the two rotor teeth and the squirrel cage slot; the width of the first magnetic yoke located between the first straight cavity segments is equal to the sum of the widths of the bottoms of the three rotor teeth and the two squirrel cage slots.

4. The self-starting synchronous reluctance rotor according to claim 3, characterized in that: Let the width of the arc-shaped cavity segment around the axis be c1, the width of the arc-shaped clearance cavity segment be c2, the width of the first magnetic yoke located between the arc-shaped cavity segment around the axis and the central shaft hole be w1, the width of the second magnetic yoke be w2, and the ratio of c1+c2 to w1+w2 be z, where z = 0.5~0.

6.

5. The self-starting synchronous reluctance rotor according to claim 1, characterized in that: Each of the first straight cavity segments in the first magnetic barrier cavity is separated from a corresponding rat cage slot by a first magnetic bridge, and each of the second straight cavity segments in the second magnetic barrier cavity is separated from two adjacent rat cage slots by a second magnetic bridge.

6. The self-starting synchronous reluctance rotor according to claim 1, characterized in that: The bottom of the rat cage trough is flat while the top is convex. The height between the bottom and the top of the trough is between 3 and 5.2 mm.

7. The self-starting synchronous reluctance rotor according to claim 1, characterized in that: The total number of the squirrel cage slots is 32 to 40 and is an even number, of which each H-shaped integrated conductor slot group has 4 to 8 squirrel cage slots.

8. A stator-rotor structure, characterized in that: It includes a rotor, a stator core, and a stator winding wound in the stator slots of the stator core, wherein the rotor is a self-starting synchronous reluctance rotor according to any one of claims 1 to 7, and the stator winding is made of copper enameled wire, aluminum enameled wire, or copper-clad aluminum enameled wire.

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