A stepped pole wing rotor and switched reluctance motor

Abstract

The utility model relates to switch reluctance motor technical field discloses a kind of stepped pole wing rotors and switch reluctance motor, comprising: rotor body;The rotor body includes rotor yoke and multiple groups of salient pole column, multiple groups The salient pole column is respectively arranged at the outside of rotor yoke, and multiple groups salient pole column are equiangularly arranged;Every group The salient pole column is integrally profiled with stepped pole wing at one end away from rotor yoke, and the thickness of the middle part of the stepped pole wing is greater than the thickness of both ends;Through the stepped pole wing arranged on rotor body, effectively control air gap variation rate, avoid maximum air gap exceeds reasonable value, to reduce the vibration noise when motor switch, simultaneously, the torque of motor is improved, and the power performance of motor is further improved, the balance of air gap of rotor body in rotation process is guaranteed, the motor switching frequency is improved, and energy loss is reduced, the use efficiency of motor is improved.

Description

Technical Field

[0001] This utility model relates to the field of switched reluctance motor technology, specifically a stepped polar rotor and a switched reluctance motor. Background Technology

[0002] Switched reluctance motors are a type of speed-regulating motor developed after DC motors and brushless DC motors. Countries such as the UK and the US started research on switched reluctance motors earlier and have achieved significant results. The power rating of the products ranges from several W to hundreds of KW, and they are widely used in household appliances, aviation, aerospace, electronics, machinery and electric vehicles. The rotor core is part of the motor's magnetic circuit. It is composed of the stator core, air gap core and air gap. In most small and medium-sized AC motors, the rotor core is directly mounted on the motor shaft.

[0003] Existing motors, when switched on and off, suffer from excessive air gap change rate between the salient poles of the rotor and stator, resulting in the maximum air gap exceeding the reasonable value. This increases the vibration and noise of the motor during switching. On the other hand, an excessively small air gap change rate leads to insufficient torque and a decrease in motor power performance. Therefore, we need to propose a stepped pole rotor and a switched reluctance motor. Utility Model Content

[0004] The purpose of this invention is to provide a stepped polar rotor and a switched reluctance motor. By setting a stepped polar rotor, the air gap between the rotor and the stator is balanced during rotation, thereby increasing the motor switching frequency, reducing vibration and noise, increasing the motor torque, and improving the motor's efficiency, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a stepped polar rotor, comprising:

[0006] Rotor body;

[0007] The rotor body includes a rotor yoke and multiple sets of salient pole posts. The multiple sets of salient pole posts are respectively arranged on the outside of the rotor yoke, and the multiple sets of salient pole posts are arranged at equal angles.

[0008] Each set of salient pole posts has a stepped pole wing at the end away from the rotor yoke. The thickness of the middle part of the stepped pole wing is greater than the thickness of the two ends, and the stepped pole wing is symmetrically provided with stepped structures for balancing the air gap.

[0009] Preferably, the stepped structure includes a first stepped groove, a second stepped groove, a third stepped groove, and a fourth stepped groove, wherein the first stepped groove, the second stepped groove, the third stepped groove, and the fourth stepped groove are respectively opened from near to far on the side of the stepped polar airfoil away from the rotor yoke.

[0010] Preferably, the distance between the middle part of one side of the stepped polar airfoil and the rotor yoke is greater than the distance between the stepped structure and the rotor yoke, and the distances between the first stepped groove, the second stepped groove, the third stepped groove and the fourth stepped groove and the rotor yoke decrease sequentially.

[0011] Preferably, the lengths of the first, second, third, and fourth stepped grooves increase sequentially, and the depths of the first, second, third, and fourth stepped grooves are the same.

[0012] A switched reluctance motor includes a stepped polar rotor and a motor housing as described above, and also includes a stator body installed inside the motor housing, wherein the rotor body is installed inside the stator body.

[0013] Preferably, the stator body includes a stator yoke and multiple sets of stator salient poles disposed inside the stator yoke. The number of the multiple sets of stator salient poles is twice the number of salient pole posts. Each set of stator salient poles has a stator tooth groove at one end near the salient pole post.

[0014] Preferably, each set of stator salient poles has toothed wings at both ends, and the toothed wings are mainly supported by an inner toothed wing and an outer toothed wing integrally formed, with the inner toothed wing being disposed on the stator salient pole.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention mainly uses stepped pole wings set on the rotor body to effectively control the air gap change rate, avoid the maximum air gap from exceeding the reasonable value, thereby reducing vibration and noise when the motor is switched on and off. At the same time, it increases the motor torque, thereby improving the motor's power performance, ensuring the balance of the air gap during the rotation of the rotor body, increasing the motor switching frequency, reducing energy loss, and improving the motor's efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the rotor body structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the stator body structure of this utility model.

[0020] In the diagram: 10, rotor body; 101, rotor yoke; 102, salient pole post; 103, stepped pole airfoil; 104, first stepped slot; 105, second stepped slot; 106, third stepped slot; 107, fourth stepped slot; 20, stator body; 201, stator yoke; 202, stator salient pole; 203, stator tooth slot; 204, tooth airfoil body; 205, internal tooth airfoil; 206, external tooth airfoil. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-3 This utility model provides a technical solution: a stepped polar rotor, comprising:

[0023] Rotor body 10;

[0024] The rotor body 10 includes a rotor yoke 101 and multiple sets of salient pole posts 102. The multiple sets of salient pole posts 102 are respectively disposed on the outer side of the rotor yoke 101, and the multiple sets of salient pole posts 102 are arranged at equal angles. The salient pole posts 102 arranged at equal angles cause the rotor body 10 to form a periodic magnetic reluctance change with the stator salient pole 202 when rotating, and drive the rotor body 10 to rotate through the principle of minimum magnetic reluctance.

[0025] Each set of salient pole posts 102 has a stepped pole wing 103 at the end away from the rotor yoke 101. The thickness of the middle part of the stepped pole wing 103 is greater than that at both ends, and the stepped pole wing 103 is symmetrically provided with stepped structures for balancing the air gap. The greater thickness of the middle part of the stepped pole wing 103 can adjust the air gap distribution between the rotor body 10 and the stator salient pole 202 when the rotor body 10 rotates. When the rotor body 10 rotates, the air gap between the middle part of the stepped pole wing 103 and the stator salient pole 202 is smaller, and the air gap at both ends is larger. The thickness difference balances the air gap change rate, avoids sudden changes in magnetic reluctance caused by sudden changes in air gap, thereby reducing vibration noise and optimizing torque output.

[0026] The stepped structure includes a first stepped groove 104, a second stepped groove 105, a third stepped groove 106, and a fourth stepped groove 107. The first stepped groove 104, the second stepped groove 105, the third stepped groove 106, and the fourth stepped groove 107 are respectively opened from near to far on the side of the stepped pole 103 away from the rotor yoke 101. The stepped structure forms a gradient air gap on the surface of the stepped pole 103 by decreasing the spacing of the stepped structure. When the rotor body 10 rotates, the first stepped groove 104, the second stepped groove 105, the third stepped groove 106, and the fourth stepped groove 107 correspond to the stator salient pole 202 in sequence. Then, the air gap size is adjusted by the position difference between the stepped structure and the stator salient pole 202, so that the air gap change rate is smoother and the maximum air gap is prevented from exceeding the reasonable value, thereby reducing vibration and noise.

[0027] The distance between the middle of one side of the stepped pole 103 and the rotor yoke 101 is greater than the distance between the stepped structure and the rotor yoke 101. The distances between the first stepped slot 104, the second stepped slot 105, the third stepped slot 106 and the fourth stepped slot 107 and the rotor yoke 101 decrease sequentially, which expands the working area between the stepped pole 103 and the stator salient pole 202. During the rotation of the rotor body 10, the magnetic resistance is gradually changed, making the torque output more stable and solving the problem of insufficient torque caused by the small air gap change rate in traditional designs.

[0028] The lengths of the first stepped slot 104, the second stepped slot 105, the third stepped slot 106, and the fourth stepped slot 107 increase sequentially, and the depths of the first stepped slot 104, the second stepped slot 105, the third stepped slot 106, and the fourth stepped slot 107 are the same. The same depth can avoid the excessive change rate of magnetic reluctance during the process of changing the magnetic reluctance, which will affect the torque output and improve the stability of the motor drive.

[0029] A switched reluctance motor includes a stepped polar rotor and a motor housing as described above, and also includes a stator body 20 installed inside the motor housing, with the rotor body 10 installed inside the stator body 20.

[0030] The stator body 20 includes a stator yoke 201 and multiple sets of stator salient poles 202 disposed inside the stator yoke 201. The number of multiple sets of stator salient poles 202 is twice the number of salient pole posts 102. Each set of stator salient poles 202 has a stator tooth groove 203 at one end near the salient pole post 102. When the number of stator salient poles 202 is twice the number of rotor salient pole posts 102, alternating magnetic pull can be formed.

[0031] Each set of stator salient poles 202 has toothed airfoils 204 at both ends. The toothed airfoils 204 are mainly supported by an inner toothed airfoil 205 and an outer toothed airfoil 206 integrally formed. The inner toothed airfoil 205 is set on the stator salient pole 202. The toothed airfoils 204 expand the magnetic field range of the stator salient pole 202. The combination of the inner toothed airfoil 205 and the outer toothed airfoil 206 makes the magnetic field distribution more uniform. When the stepped pole wing 103 of the rotor body 10 rotates, the toothed airfoils 204 cooperate with the stepped structure to further refine the air gap change gradient and enhance the smoothness of magnetic reluctance change, thereby improving the torque output accuracy and reducing operating noise.

[0032] In use, the windings of the stator body 20 are energized sequentially to generate a rotating magnetic field. The salient pole post 102 of the rotor body 10 rotates with the magnetic field under the principle of minimum magnetic reluctance. When the rotor body 10 rotates, the shape of the stepped pole airfoil 103 keeps the air gap relatively balanced during dynamic changes, avoiding excessively large or small air gap change rates. This makes the magnetic reluctance change of the motor magnetic circuit more reasonable. During the motor switching process, there will be no large vibration noise due to excessive air gap change rate, nor will there be insufficient torque due to insufficient air gap change rate, thereby achieving the effects of reducing noise, increasing torque and improving efficiency.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stepped polar rotor, characterized in that, include: Rotor body (10); The rotor body (10) includes a rotor yoke (101) and multiple sets of salient pole posts (102). The multiple sets of salient pole posts (102) are respectively arranged on the outside of the rotor yoke (101), and the multiple sets of salient pole posts (102) are arranged at equal angles. Each of the salient pole posts (102) has a stepped pole wing (103) at the end away from the rotor yoke (101). The thickness of the middle part of the stepped pole wing (103) is greater than the thickness of the two ends, and the stepped pole wing (103) is symmetrically provided with stepped structures for balancing the air gap.

2. A stepped polar rotor according to claim 1, characterized in that: The stepped structure includes a first stepped groove (104), a second stepped groove (105), a third stepped groove (106), and a fourth stepped groove (107). The first stepped groove (104), the second stepped groove (105), the third stepped groove (106), and the fourth stepped groove (107) are respectively opened from near to far on the side of the stepped polar airfoil (103) away from the rotor yoke (101).

3. A stepped polar rotor according to claim 2, characterized in that: The distance between the middle part of one side of the stepped polar airfoil (103) and the rotor yoke (101) is greater than the distance between the stepped structure and the rotor yoke (101). The distances between the first stepped groove (104), the second stepped groove (105), the third stepped groove (106) and the fourth stepped groove (107) and the rotor yoke (101) decrease sequentially.

4. A stepped polar rotor according to claim 3, characterized in that: The lengths of the first stepped groove (104), the second stepped groove (105), the third stepped groove (106), and the fourth stepped groove (107) increase sequentially, and the depths of the first stepped groove (104), the second stepped groove (105), the third stepped groove (106), and the fourth stepped groove (107) are the same.

5. A switched reluctance motor, comprising a stepped polar rotor according to any one of claims 1-4 and a motor housing, characterized in that: It also includes a stator body (20) installed inside the motor housing, wherein the rotor body (10) is installed inside the stator body (20).

6. A switched reluctance motor according to claim 5, characterized in that: The stator body (20) includes a stator yoke (201) and multiple sets of stator salient poles (202) disposed inside the stator yoke (201). The number of multiple sets of stator salient poles (202) is twice the number of salient pole posts (102). Each set of stator salient poles (202) has a stator tooth groove (203) at one end near the salient pole post (102).

7. A switched reluctance motor according to claim 6, characterized in that: Each set of stator salient poles (202) is provided with toothed wing bodies (204) at both ends, and the toothed wing bodies (204) are mainly supported by an inner toothed wing (205) and an outer toothed wing (206) integrally formed, with the inner toothed wing (205) disposed on the stator salient pole (202).

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