Rotor structure and synchronous reluctance motor with same

Abstract

The utility model relates to the field of motors, in particular to a rotor structure and a synchronous reluctance motor with the rotor structure. Comprising a punching sheet body which is provided with a shaft hole. A plurality of magnetic barrier groups are arranged on the punching sheet body; each magnetic barrier group comprises a plurality of air magnetic barriers; the adjacent air magnetic barriers in each magnetic barrier group are distributed at intervals; a permanent magnet is arranged in each air magnetic barrier; according to the utility model, the plurality of air magnetic barriers are arranged in each magnetic barrier group, and the magnetic conductive ribs are formed between the adjacent air magnetic barriers; a permanent magnet is arranged in each air magnetic barrier; on the basis of the arrangement, the directions of dq-axis magnetic circuits of the motor can be effectively guided; the d-axis magnetic resistance is obviously reduced, and the q-axis magnetic resistance can be greatly improved at the same time, so that the salient pole rate of the motor is improved, and the electromagnetic torque output energy of the motor is improved.

Description

Technical Field

[0001] The utility model relates to the field of motors, in particular to a rotor structure and a synchronous reluctance motor having the rotor structure. Background Art

[0002] The synchronous reluctance motor is a type of motor that uses the difference in dq-axis reluctance to form electromagnetic torque. Compared with traditional induction motors, it has the advantages of low loss, high efficiency, simple structure, and high power density. At the same time, compared with traditional permanent magnet synchronous motors, it has the advantages of low cost, simple process, wide speed regulation range, and low cost.

[0003] At present, synchronous reluctance motors have gradually been used in household appliances, engineering machinery and aerospace fields, and are an important type of motor in the direction of de-rare earthization of motors.

[0004] In order to maximize the electromagnetic torque of the synchronous reluctance motor, the rotor laminations are generally made of high magnetic permeability silicon steel sheets. Usually, air magnetic barriers of various types and sizes are opened on the rotor laminations along the q-axis direction to increase the q-axis magnetic resistance and reduce the q-axis inductance. Along the d-axis direction of the rotor laminations, the laminations are ensured to have better magnetic conductivity as much as possible to reduce the d-axis magnetic resistance and increase the d-axis inductance.

[0005] However, since the dq-axis magnetic circuit shares a portion of the magnetic circuit in the rotor punching area, adjusting the magnetic resistance of one axis will also affect the magnetic resistance of the other axis, which ultimately makes it difficult to maximize the salient pole ratio, that is, the ratio of the d-axis inductance to the q-axis inductance.

[0006] At the same time, there is a lack of connectors at the end of the air magnetic barrier near the outer circle of the rotor punching, which results in a lack of connection between adjacent air magnetic barriers. When the rotor rotates at high speed, the rotor will face the risk of deformation and damage.

[0007] For example, the content disclosed in patent 201921636228.4 - rotor punching, motor rotor and synchronous reluctance motor.

[0008] In summary, the traditional rotor structure topology can effectively improve the electromagnetic torque output capacity of the synchronous reluctance motor. However, the mechanical strength of the rotor is difficult to guarantee. When the rotor rotates at high speed, the rotor will face the risk of deformation and damage, which greatly reduces the reliability and service life of the motor.

[0009] Therefore, in order to improve or solve at least one of the above problems, it is necessary to optimize the design of the existing rotor punching structure. Utility Model Content

[0010] The utility model aims to provide a rotor structure with high salient pole ratio.

[0011] In order to achieve the above purpose, the utility model.

[0012] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0013] A rotor structure comprises a punching sheet body, wherein the punching sheet body is provided with an axial hole;

[0014] The punching sheet body is provided with a plurality of magnetic barrier groups;

[0015] Each of the magnetic barrier groups includes a plurality of air magnetic barriers; the adjacent air magnetic barriers in each magnetic barrier group are spaced apart; and a permanent magnet is arranged in each of the air magnetic barriers.

[0016] Each of the air magnetic barriers is arc-shaped.

[0017] A permanent magnet is respectively arranged at both ends of each of the air magnetic barriers.

[0018] Each of the air magnetic barriers is provided with a reinforcing rib; the reinforcing rib is arranged at the center of the corresponding air magnetic barrier.

[0019] A magnetic barrier notch is arranged at the edge of the punching sheet body; the magnetic barrier notch is an arc-shaped notch.

[0020] The punching sheet body is provided with four magnetic barrier groups; the four magnetic barrier groups are evenly distributed along the circumferential direction on the punching sheet body; the magnetic barrier gaps are distributed at the edge of the punching sheet body; each magnetic barrier gap corresponds to a magnetic barrier group.

[0021] Each of the magnetic barrier groups includes three air magnetic barriers; the three air magnetic barriers are distributed in sequence from the center of the punching sheet body to the edge of the punching sheet body.

[0022] The multiple air magnetic barriers in each magnetic barrier group are arranged concentrically; the length of the air magnetic barriers in each magnetic barrier group decreases from the center of the punching sheet body to the edge of the punching sheet body.

[0023] Each of the air magnetic barrier ends is spaced apart from the outer side of the punching sheet body.

[0024] A synchronous reluctance motor comprises the rotor structure.

[0025] The advantages of the utility model are:

[0026] The utility model discloses a rotor structure and a synchronous reluctance motor with the rotor structure.

[0027] The utility model arranges a plurality of air magnetic barriers in each magnetic barrier group, and forms magnetic conductive ribs between adjacent air magnetic barriers; at the same time, permanent magnets are arranged in each air magnetic barrier; based on such an arrangement, the direction of the dq axis magnetic circuit of the motor can be effectively guided; while significantly reducing the d axis magnetic resistance, the q axis magnetic resistance can be greatly increased, thereby increasing the motor salient pole ratio, thereby improving the motor electromagnetic torque output capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following is a brief description of the contents expressed in each of the drawings of the utility model specification and the marks in the drawings:

[0029] Figure 1 It is an overall schematic diagram of the rotor structure of the synchronous reluctance motor of the utility model.

[0030] like Figure 2 This is a comparison chart of the finite element simulation motor torque curves of two different rotor punchings (without permanent magnets at the end of the magnetic barrier and with permanent magnets at the end of the magnetic barrier).

[0031] The marks in the above figure are:

[0032] 1-1, rotor structure, 1, punching plate body; 2, shaft hole; 3, air magnetic barrier; 3-1, magnetic barrier group, 4, arc-shaped magnetic barrier gap; 5, magnetic ribs; 6, permanent magnet; 7, reinforcing ribs; 8, magnetic isolation bridge; A, d axis; B, q axis. DETAILED DESCRIPTION

[0033] The specific implementation methods of the present utility model will be further explained in detail below by describing the optimal embodiments with reference to the accompanying drawings.

[0034] A rotor structure comprises a lamination body 1, on which an axial hole 2 is provided; a plurality of magnetic barrier groups 3-1 are provided on the lamination body 1; each of the magnetic barrier groups 3-1 comprises a plurality of air magnetic barriers 3; adjacent air magnetic barriers 3 in each magnetic barrier group 3-1 are spaced apart; a permanent magnet 6 is provided in each air magnetic barrier 3; the utility model arranges a plurality of air magnetic barriers 3 in each magnetic barrier group 3-1, and forms magnetic conductive ribs 5 between adjacent air magnetic barriers 3; and at the same time, arranges permanent magnets in each air magnetic barrier 3; based on such an arrangement, the direction of the dq axis magnetic circuit of the motor can be effectively guided; the d axis magnetic resistance can be significantly reduced while the q axis magnetic resistance can be greatly increased, thereby increasing the salient pole ratio of the motor, thereby improving the electromagnetic torque output capacity of the motor.

[0035] In the utility model, the lamination body 1 is the main structure of the rotor structure 1-1; in the utility model, a plurality of magnetic barrier groups 3-1 are arranged on the lamination body 1; each of the magnetic barrier groups 3-1 includes a plurality of air magnetic barriers 3; in the utility model, a multi-layer magnetic barrier structure is adopted to make full use of the magnetic resistance torque of the motor; at the same time, in the utility model, adjacent air magnetic barriers 3 in each magnetic barrier group 3-1 are distributed at intervals; magnetic conductive ribs 5 are formed between adjacent air magnetic barriers 3; such an arrangement can ensure the structural strength of the rotor lamination to a certain extent, at the same time, in the utility model, a permanent magnet 6 is arranged in each of the air magnetic barriers 3; the arrangement of the permanent magnet 6 can not only provide permanent magnet torque for the motor, but also improve the power factor of the motor and reduce the torque pulsation of the motor.

[0036] It should be noted here that the magnetic ribs 5 described above and below are essentially also a part of the punching sheet body 1. Because of the different setting positions, they are called magnetic ribs 5 here; the area of ​​the punching sheet body 1 between adjacent air magnetic barriers 3 is the above-mentioned magnetic ribs 5.

[0037] At the same time, the punching sheet body in the utility model is essentially what is called a rotor punching sheet structure in the industry.

[0038] Furthermore, in the utility model, each of the air magnetic barriers 3 is arc-shaped; the arc-shaped structure here mainly refers to that the air magnetic barrier 3 is essentially an arc-shaped slot structure. Based on such a setting, the performance of the motor using the rotor structure 1-1 can be better improved; at the same time, the arc-shaped air magnetic barrier 3 also facilitates the arrangement of the air magnetic barrier 3 on the rotor punching sheet; at the same time, the arc-shaped air magnetic barrier 3 can obtain lower torque pulsation, making the back electromotive force more sinusoidal.

[0039] At the same time, in the utility model, a permanent magnet 6 is respectively provided at both ends of each of the air magnetic barriers 3; based on such a setting, the permanent magnet torque can be better provided for the motor, and the power factor of the motor can be improved, and the torque pulsation of the motor can be reduced.

[0040] Furthermore, in the utility model, each of the air magnetic barriers 3 is provided with a reinforcing rib 7; the provision of the reinforcing rib 7 increases the overall structural strength of the rotor punching to a certain extent, and at the same time, in the utility model, the reinforcing rib 7 is arranged at the center of the corresponding air magnetic barrier 3; specifically, the reinforcing rib 7 is arranged along the center line of the arc-shaped air magnetic barrier 3; based on the above design, the mechanical strength of the rotor punching can be significantly improved, and the high-speed operation capability and reliability of the motor can be improved.

[0041] Furthermore, in the utility model, a magnetic barrier notch 4 is provided at the edge of the punching sheet body 1; the magnetic barrier notch 4 is an arc-shaped notch; the provision of the arc-shaped notch can reduce torque pulsation.

[0042] Furthermore, in the utility model, four magnetic barrier groups 3-1 are provided on the lamination body 1; the four magnetic barrier groups 3-1 are evenly distributed along the circumferential direction on the lamination body 1; the magnetic barrier gaps 4 are distributed at the edge of the lamination body 1; each of the magnetic barrier gaps 4 corresponds to a magnetic barrier group 3-1; based on such a setting, the symmetry of the magnetic field can be guaranteed; at the same time; the magnetic barrier gaps 4 are distributed at the edge of the lamination body 1; each of the magnetic barrier gaps 4 corresponds to a magnetic barrier group 3-1; such a setting can further improve the magnetic resistance of the rotor lamination.

[0043] Furthermore, in the utility model, each of the magnetic barrier groups 3-1 includes three air magnetic barriers 3; the three air magnetic barriers 3 are spaced apart in sequence from the center of the lamination body 1 to the edge of the lamination body 1; the multi-layer magnetic barrier structure adopted in the utility model can make full use of the magnetic resistance torque of the motor; at the same time, in the utility model, adjacent air magnetic barriers 3 in each magnetic barrier group 3-1 are spaced apart; magnetic conductive ribs 5 are formed between adjacent air magnetic barriers 3; such an arrangement can ensure the structural strength of the rotor lamination to a certain extent.

[0044] At the same time, in the utility model, the multiple air magnetic barriers 3 in each magnetic barrier group 3-1 are arranged concentrically; the length of the air magnetic barriers 3 in each magnetic barrier group 3-1 decreases successively from the center of the punching sheet body 1 to the edge of the punching sheet body 1; such an arrangement can facilitate the placement and arrangement of each air magnetic barrier 3 in the magnetic barrier group 3-1 on the punching sheet body 1.

[0045] Furthermore, in the utility model, each end of the air magnetic barrier 3 is spaced apart from the outer side of the punching body 1; the spaced apart distribution here is mainly to avoid the air magnetic barrier 3 from being connected to the outer side of the rotor punching. Based on such a setting, it is equivalent to connecting the ends of each air magnetic barrier 3 in each magnetic barrier group 3-1 through a magnetic isolation bridge 8. The magnetic isolation bridge 8 is essentially a part of the punching body 1. The magnetic isolation bridge 8 can effectively ensure the structural strength of the rotor punching; and the permanent magnet 6 can make the magnetic isolation bridge 8 in a highly saturated state, further improving the torque output capacity of the motor.

[0046] A synchronous reluctance motor comprises the rotor structure 1-1.

[0047] specific:

[0048] like Figure 1 The rotor structure 1 - 1 shown mainly includes a punching sheet body 1 , an axial hole 2 , an air magnetic barrier 3 , an arc-shaped magnetic barrier notch 4 on the periphery of the punching sheet, magnetic conductive ribs 5 , permanent magnets 6 , reinforcing ribs 7 and a magnetic isolation bridge 8 .

[0049] Among them, the outer diameter of the punching sheet body 1 is 214.4mm, and there is an axial hole 2 in the middle that can accommodate the motor shaft, and its aperture is 60mm; a magnetic barrier gap 4 is opened on the outer circle of the punching sheet body 1; the punching sheet body 1 has multiple groups of magnetic resistance air magnetic barriers 3 along the radial direction; the ends of the air magnetic barriers 3 are filled with permanent magnets 6, and are connected by magnetic isolation bridges 8, and the magnetic barriers are connected by magnetic conductive ribs 5; the center and ends of the rotor punching sheet 1 are provided with mechanical strength reinforcement structures.

[0050] Reference Figure 1 In this embodiment, the magnetic barrier notch 4 on the outer circle of the punch body 1 is in an arc shape, and its radius can be a plurality of values ​​known to those skilled in the art.

[0051] In a preferred example of the present invention, the radius of the arc-shaped magnetic barrier gap 4 is 58.60 mm.

[0052] Reference Figure 1 In this embodiment, the punching sheet body 1 is provided with three groups of magnetic resistance air magnetic barriers 3 in the radial direction, and each group of air magnetic barriers 3 is distributed in parallel. Magnetic conductive ribs 5 are formed between the air magnetic barriers 3, and the inner and outer contours of the air magnetic barriers 3 are concentric circles. The radius of the air magnetic barriers 3 can be multiple values ​​known to those skilled in the art.

[0053] In a preferred example of the present invention, along the radial direction from inside to outside, the inner and outer diameters of the first group of air magnetic barriers 3 are 106.60 mm and 100.60 mm; the inner and outer diameters of the second group of air magnetic barriers 3 are 90.60 mm and 94.60 mm; the inner and outer diameters of the third group of air magnetic barriers 3 are 74.60 mm and 68.60 mm.

[0054] Reference Figure 1 In this embodiment, the ratio of the thickness of the air magnetic barrier 3 to the thickness of the magnetic conductive rib 5 is in the range of 0.5-1.5. In a preferred example of the present invention, the ratio is 0.6.

[0055] Reference Figure 1 In this embodiment, the center lines of the three groups of air magnetic barriers 3 are disconnected along the q-axis B and connected by reinforcing ribs 7.

[0056] The width of the reinforcing rib 7 ranges from 4 mm to 8 mm. In a preferred embodiment of the present invention, the width is 4 mm.

[0057] Reference Figure 1 In this embodiment, the ends of the air magnetic barrier 3 are connected by a magnetic isolation bridge 8. The thickness of the magnetic isolation bridge 8 can be a plurality of values ​​known to those skilled in the art. In a preferred example of the present utility model, the thickness is 4 mm.

[0058] Reference Figure 1In this embodiment, the end of the air magnetic barrier 3 is filled with a permanent magnet 6, the magnetization direction of the permanent magnet 6 is along the motor d-axis A direction, and the thickness of the permanent magnet 6 ranges from 2mm to 5mm. In a preferred example of the present utility model, its thickness is 2.5mm.

[0059] like Figure 2 The figure shows the comparison of the torque curves of the motor simulated by finite element simulation for two different rotor punchings (one without permanent magnet 6 at the end of the magnetic barrier and one with permanent magnet 6 at the end of the magnetic barrier). Figure 2 In the experiment, according to the control variable method, other dimensions are controlled to remain unchanged. There are two types of permanent magnet 6 punching sheets, namely, 6 punching sheets without permanent magnets at the end of the magnetic barrier and 6 punching sheets with permanent magnets at the end of the magnetic barrier. The average output electromagnetic torque of the 6 punching sheets without permanent magnets at the end of the magnetic barrier is 58Nm, and the average output electromagnetic torque of the 6 punching sheets with permanent magnets at the end of the magnetic barrier is 63Nm.

[0060] It can be seen that the rotor punchings of the synchronous reluctance motor in the embodiment of the utility model can effectively improve the output electromagnetic torque.

[0061] The implementation principle of the utility model is:

[0062] An arc-shaped magnetic barrier notch 4 is cut out on the periphery of the punching sheet body 1, and three layers of air magnetic barriers 3 are opened inside the punching sheet body 1 along the q-axis B direction. The three layers of air magnetic barriers 3 are connected by magnetic conductive ribs 5, which significantly reduces the magnetic resistance in the d-axis A direction and increases the magnetic resistance in the q-axis B direction, thereby improving the torque output capacity and electrical performance of the motor. In addition, the magnetic conductive ribs 5 improve the structural stability of the rotor.

[0063] In addition, the end of the air magnetic barrier 3 is filled with a permanent magnet 6 and connected with a magnetic isolation bridge 8. The magnetic isolation bridge 8 can effectively ensure the structural strength of the rotor punching 1; and the permanent magnet 6 can make the magnetic isolation bridge 8 in a highly saturated state, further improving the torque output capacity of the motor.

[0064] Finally, a reinforcing rib 7 is provided in the middle of the punch body 1, which can further improve the structural strength of the entire rotor.

[0065] The rotor structure 1-1 disclosed in the utility model can ensure a high salient pole ratio while taking into account the mechanical strength of the rotor, thereby improving the reliability and service life of the motor.

[0066] In order to achieve the above-mentioned object, the embodiment of the utility model provides a synchronous reluctance motor rotor structure 1-1, comprising:

[0067] A synchronous reluctance motor rotor structure 1-1, wherein the circular silicon steel sheet punching body 1 has an axial hole 2 in the middle, and a magnetic barrier gap 4 is opened on the outer circle of the punching sheet; the punching sheet body 1 has multiple groups of magnetic resistance air magnetic barriers 3 radially opened, and the ends of the air magnetic barriers 3 are filled with permanent magnets 6 and connected by magnetic isolation bridges 8, and the magnetic barriers are connected by magnetic conductive ribs 5; the center and ends of the punching sheet are provided with mechanical strength reinforcement structures.

[0068] In the utility model, the outer magnetic barrier gap 4 of the punching sheet is in an arc shape, which is convenient for further improving the q-axis magnetic resistance.

[0069] The punching body 1 is provided with a plurality of groups of magnetic resistance air magnetic barriers 3 along the radial direction. The groups of magnetic barriers are arranged in parallel. Magnetic conductive ribs 5 are formed between the magnetic barriers. The inner and outer contours of the magnetic barriers are concentric circles, which is convenient for increasing the dq axis inductance difference, thereby increasing the motor salient pole rate.

[0070] The center lines of the multiple groups of air magnetic barriers 3 are disconnected along the q axis of the motor and connected by reinforcing ribs 7.

[0071] The end of the air magnetic barrier 3 is filled with a permanent magnet 6, and the magnetization direction of the permanent magnet 6 is along the d-axis direction of the motor.

[0072] The ends of the air magnetic barrier 3 are connected by a magnetic isolation bridge 8 .

[0073] The value range of the 3-1 number of the air magnetic barrier group 3 is 2-3.

[0074] The ratio of the thickness of the air magnetic barrier 3 to the thickness of the magnetic conductive rib 5 is in the range of 0.5-1.5.

[0075] The width of the reinforcing rib 7 at the neutral line of the air magnetic barrier 3 ranges from 4 mm to 8 mm.

[0076] The end of the air magnetic barrier 3 is filled with a permanent magnet 6, and the thickness of the permanent magnet 6 ranges from 2 mm to 5 mm.

[0077] The beneficial effects of the utility model are:

[0078] In the utility model, a synchronous reluctance motor rotor punching sheet has a punching sheet body 1 with multiple groups of reluctance air magnetic barriers 3 radially arranged, and the magnetic barriers are connected with magnetic conductive ribs 5. This structure can effectively guide the direction of the dq axis magnetic circuit of the motor, significantly reduce the d axis magnetic resistance and greatly improve the q axis magnetic resistance, thereby increasing the motor salient pole rate, thereby improving the motor electromagnetic torque output capacity.

[0079] The center line of the air magnetic barrier 3 is disconnected along the motor q axis and connected by the reinforcing rib 7, which can significantly improve the mechanical strength of the rotor punching and improve the high-speed operation capability and reliability of the motor.

[0080] The ends of the air magnetic barrier 3 are connected by a magnetic isolation bridge 8, and the ends of the air magnetic barrier 3 are filled with permanent magnets 6. The magnetization direction of the permanent magnets 6 is along the d-axis direction of the motor, so that the magnetic isolation bridge 8 is in a highly saturated state. This structure can effectively ensure the structural strength of the outer circle of the rotor punching. At the same time, the highly saturated magnetic isolation bridge 8 can significantly increase the magnetic resistance of the q-axis, reduce the q-axis inductance, and further improve the electromagnetic torque output capacity of the motor.

[0081] Obviously, the specific implementation of the present invention is not limited by the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A rotor structure, characterized in that: It comprises a punching sheet body, and the punching sheet body is provided with an axial hole; The punching sheet body is provided with a plurality of magnetic barrier groups; Each of the magnetic barrier groups includes a plurality of air magnetic barriers; the adjacent air magnetic barriers in each magnetic barrier group are spaced apart; and a permanent magnet is arranged in each of the air magnetic barriers.

2. A rotor structure according to claim 1, characterized in that: Each of the air magnetic barriers is arc-shaped.

3. A rotor structure according to claim 1, characterized in that: A permanent magnet is respectively arranged at both ends of each of the air magnetic barriers.

4. A rotor structure according to claim 1, characterized in that: Each of the air magnetic barriers is provided with a reinforcing rib; the reinforcing rib is arranged at the center of the corresponding air magnetic barrier.

5. A rotor structure according to claim 1, characterized in that: A magnetic barrier notch is arranged at the edge of the punching sheet body; the magnetic barrier notch is an arc-shaped notch.

6. A rotor structure according to claim 5, characterized in that: The punching sheet body is provided with four groups of magnetic barrier groups; the four magnetic barrier groups are evenly distributed along the circumferential direction on the punching sheet body; the magnetic barrier gaps are distributed at the edge of the punching sheet body; each magnetic barrier gap corresponds to a magnetic barrier group.

7. A rotor structure according to any one of claims 1 to 5, characterized in that: Each of the magnetic barrier groups includes three air magnetic barriers; the three air magnetic barriers are distributed in sequence from the center of the punching sheet body to the edge of the punching sheet body.

8. A rotor structure according to any one of claims 1 to 5, characterized in that: The multiple air magnetic barriers in each magnetic barrier group are arranged concentrically; the length of the air magnetic barriers in each magnetic barrier group decreases from the center of the punching sheet body to the edge of the punching sheet body.

9. A rotor structure according to claim 1, characterized in that; Each of the air magnetic barrier ends is spaced apart from the outer side of the punching sheet body.

10. A synchronous reluctance motor, characterized in that: Comprising a rotor structure as claimed in any one of claims 1 to 9.

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