Rotor structure of permanent magnet motor

Abstract

The utility model relates to the technical field of motor structures, in particular to a rotor structure of a permanent magnet motor, which comprises a main body and a built-in hybrid permanent magnet assembly, the built-in hybrid permanent magnet assembly comprises a permanent magnet, a magnetic isolation air slot and a placement cavity, the permanent magnet is fixedly connected with the main body and located in the main body, and the magnetic isolation air slot is fixedly connected with the main body and located in the placement cavity. The permanent magnet is arranged in the main body, the magnetic isolation air slot is arranged on one side of the permanent magnet, the placement cavity is detachably connected with the main body and is located in the center of the interior of the main body, and the original surface-mounted process is replaced by a built-in process, so that the certain defects of the surface-mounted process, such as inevitable shaking of the permanent magnet when the motor is suddenly stopped, and the permanent magnet is prevented from being damaged by the built-in process. And compared with a built-in PMSM rotor magnetic circuit structure, the surface-mounted process has the advantages of larger magnetic flux of each pole, smaller magnetic leakage coefficient, no need of taking isolation measures, easiness in control of pole-arc coefficient, high rotor strength and difficulty in deformation of the permanent magnets on the premise of insufficient safety of the built-in PMSM rotor magnetic circuit structure.

Description

Technical Field

[0001] The utility model relates to the technical field of motor structures, in particular to a rotor structure of a permanent magnet motor. Background Art

[0002] With the development of permanent magnet motors, especially the promotion and application of permanent magnet motors in the field of electric vehicles, permanent magnet motors are highly recognized for their high power density and high efficiency, and are widely used in the field of electric vehicles. Because permanent magnet motors are an industry that has developed rapidly in recent years, many processes need to be improved, such as rotor processing. Traditional methods mostly use steel welding processes to achieve this. The rotor support frame is welded on the shaft, and then the support tube of the rotor silicon steel sheet is welded. The rotor silicon steel sheet is installed on the support tube, and finally the rotor core is fixed and welded firmly using the pressure plates at both ends. The disadvantages of the above technology are complex processing and many processes. Because there are many welding processes, stress relief is required, the cycle is long, and the deformation size of the welding during processing is large, and a large processing allowance needs to be left, which makes the material and processing costs high. At the same time, it cannot effectively reduce the weight and moment of inertia of the rotor, and the adjustment amount is large during dynamic balancing.

[0003] Prior art, patent number (CN201120093831.X) mentions a permanent magnet motor rotor structure including a rotor shaft and a silicon steel sheet group, and also includes an extruded aluminum alloy rotor sleeve and two rotor pressure rings, the aluminum alloy rotor sleeve is fixed on the rotor shaft, and the two rotor pressure rings are fixed at both ends of the aluminum alloy rotor sleeve by fastening screws, and the two rotor pressure rings clamp the silicon steel sheet group. It uses an extruded aluminum bracket as a support frame for the rotor core to replace the welded steel bracket in the traditional process, which greatly simplifies the production process, reduces material costs, shortens the processing cycle, and is conducive to mass production. At the same time, it can also reduce the weight of the rotor, thereby reducing the weight of the entire product, making it more suitable for use in electric vehicles.

[0004] In the prior art, the original rotor permanent magnet structure is replaced by a silicon steel sheet group, an aluminum alloy rotor sleeve and two rotor pressing rings, and the original welding industry is replaced by an extrusion molding industry, which effectively solves the problems of more welding processes, stress relief, long cycle, large deformation size of welding during processing, and the need to leave a large processing allowance, which makes the material and processing costs high. At the same time, it cannot effectively reduce the weight and moment of inertia of the rotor, and the adjustment amount is large during dynamic balancing. However, most of the current markets use a surface mounting process to connect the permanent magnet to the rotor shaft, and the surface mounting process has certain defects. For example, when the motor is stopped suddenly, the permanent magnet will inevitably shake, and thus it will not be possible to ensure that the subsequent rotor reaches the ideal usage condition during long-term use. In addition, the surface mounting process is less safe than the built-in PMSM rotor magnetic circuit structure. For this reason, we propose a rotor structure of a permanent magnet motor with a built-in hybrid PMSM rotor magnetic circuit structure. Utility Model Content

[0005] The purpose of the utility model is to provide a rotor structure of a permanent magnet motor, which solves the problem that most of the current market uses a surface mounting process to connect the permanent magnet and the rotor shaft. The surface mounting process has certain defects. For example, when the motor is stopped suddenly, the permanent magnet will inevitably shake, and thus it will be impossible to ensure that the subsequent rotor reaches the ideal usage condition during long-term use. In addition, the surface mounting process is less safe than the built-in PMSM rotor magnetic circuit structure.

[0006] To achieve the above-mentioned purpose, the utility model adopts a rotor structure of a permanent magnet motor, including a main body and a built-in hybrid permanent magnet component, the built-in hybrid permanent magnet component includes a permanent magnet, a magnetic isolation air groove and an accommodation cavity, the permanent magnet is fixedly connected to the main body and is located inside the main body, the magnetic isolation air groove is fixedly connected to the main body and is located inside the main body, and the magnetic isolation air groove is arranged on one side of the permanent magnet, and the accommodation cavity is detachably connected to the main body and is located in the center of the interior of the main body.

[0007] Among them, the built-in hybrid permanent magnet assembly also includes a rotating ring and a connecting tube, the rotating ring is rotatably connected to the main body and is located inside the main body, and the rotating ring is arranged inside the placement cavity, and the connecting tube is rotatably connected to the rotating ring and is located on the inner ring of the rotating ring.

[0008] Among them, the built-in hybrid permanent magnet assembly also includes a connecting column, an extension column and a mounting plate, the connecting column is detachably connected to the connecting cylinder and is located inside the connecting cylinder, the extension column is detachably connected to the connecting column and is located below the connecting column, and the mounting plate is detachably connected to the extension column and is located below the extension column.

[0009] Among them, the built-in hybrid permanent magnet component includes a fixed plate and a connecting cavity, the connecting cavity is detachably connected to the fixed plate and is located inside the fixed plate, the fixed plate is detachably connected to the connecting column and is located above the connecting column, and the connecting column is arranged inside the connecting cavity.

[0010] Among them, the rotor structure of the permanent magnet motor also includes a mounting hole, a mounting block, a fixed block and a control groove, the mounting hole is detachably connected to the mounting plate and is located inside the mounting plate, the mounting block is detachably connected to the mounting plate and is located inside the mounting plate, and the mounting block is arranged inside the mounting hole, the fixed block is detachably connected to the mounting block and is located above the mounting block, and the control groove is fixedly connected to the fixed block and is located in the center of the fixed block.

[0011] The utility model discloses a rotor structure of a permanent magnet motor, comprising a main body and a built-in hybrid permanent magnet component, wherein the built-in hybrid permanent magnet component comprises a permanent magnet, a magnetic isolation air groove and a placement cavity, wherein the permanent magnet is fixedly connected to the main body and is located inside the main body, the magnetic isolation air groove is fixedly connected to the main body and is located inside the main body, and the magnetic isolation air groove is arranged on one side of the permanent magnet, and the placement cavity is detachably connected to the main body and is located at the inner center of the main body, and the original surface mounting process is replaced by a built-in process, thereby solving certain defects of the surface mounting process, such as when the motor is stopped suddenly, the permanent magnet will inevitably shake, and the surface mounting process has the advantages of greater magnetic flux per pole and smaller leakage magnetic coefficient than the built-in PMSM rotor magnetic circuit structure, without the need to take isolation measures, easy control of pole arc coefficient, high rotor strength, and non-deformation of permanent magnets. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the utility model.

[0014] Figure 2 It is an overall top view of the first embodiment of the utility model.

[0015] Figure 3 This utility model Figure 2 AA line structural cross-section view.

[0016] Figure 4 It is a schematic diagram of the overall structure of the second embodiment of the utility model.

[0017] 101-main body, 102-receiving cavity, 103-rotating ring, 104-connecting tube, 105-connecting column, 106-extension column, 107-mounting plate, 108-fixing plate, 109-connecting cavity, 110-permanent magnet, 111-magnetic isolation air groove, 201-mounting hole, 202-mounting block, 203-fixing block, 204-control groove. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0019] First embodiment

[0020] See also Figure 1 to Figure 3 , Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the utility model. Figure 2 It is a top view of the whole of the first embodiment of the utility model. Figure 3 This utility model Figure 2 AA line structural cross-section view.

[0021] The utility model provides a rotor structure of a permanent magnet motor, including a main body 101 and a built-in hybrid permanent magnet component, wherein the built-in hybrid permanent magnet component includes a permanent magnet 110, a magnetic isolation air groove 111, an accommodation cavity 102, a rotating ring 103, a connecting tube 104, a connecting column 105, an extension column 106, a mounting plate 107, a fixing plate 108 and a connecting cavity 109. The above-mentioned scheme solves the problem that most of the current market uses a surface mounting process to connect the permanent magnet to the rotor shaft, and the surface mounting process has certain defects. For example, when the motor is stopped suddenly, the permanent magnet will inevitably shake, and thus it will not be possible to ensure that the subsequent rotor reaches an ideal use condition during long-term use. In addition, the surface mounting process has the problem of insufficient safety compared with the built-in PMSM rotor magnetic circuit structure. It can be understood that the above-mentioned scheme can be used for a long time, because the permanent magnet 110 is fixedly connected to the main body 101 in a U shape, and the magnetic isolation air groove 111 is arranged in the One side of the permanent magnet 110 is formed, thereby forming a built-in hybrid PMSM rotor magnetic circuit structure. While retaining the original beneficial effects, the built-in PMSM is increased in horizontal direction (q-axis) inductance greater than vertical direction (d-axis) inductance compared to the original structure, which is beneficial to weak magnetic speed increase. Since the permanent magnet is buried inside the rotor core, the rotor structure is more solid, it is easy to improve the safety of high-speed rotation of the motor and the larger magnetic flux per pole and the leakage magnetic coefficient are small, no isolation measures are required, the pole arc coefficient is easy to control, the rotor strength is high, the permanent magnet is not easy to deform and other advantages, which will actively and effectively solve the current market mostly uses the surface mounting process to connect the permanent magnet to the rotor shaft, and the surface mounting process has certain defects. For example, when the motor is stopped suddenly, the permanent magnet will inevitably shake, which will not be able to guarantee the subsequent rotor to reach the ideal use condition during long-term use, and the surface mounting process is not as safe as the built-in PMSM rotor magnetic circuit structure.

[0022] According to this specific embodiment, the permanent magnet 110 is fixedly connected to the main body 101 and is located inside the main body 101. The magnetic isolation air groove 111 is fixedly connected to the main body 101 and is located inside the main body 101. The magnetic isolation air groove 111 is arranged on one side of the permanent magnet 110. The placement cavity 102 is detachably connected to the main body 101 and is located at the inner center of the main body 101. The main body 101 is the main functional structural component constituting the whole, and the permanent magnet 110 is the main functional structural component mainly performing magnetic induction cutting operations, and the magnetic isolation air groove 111 is an auxiliary conceptual component that is easy to improve the safety of high-speed rotation of the motor.

[0023] Among them, the rotating ring 103 is rotatably connected to the main body 101 and is located inside the main body 101, and the rotating ring 103 is arranged inside the accommodation cavity 102, the connecting tube 104 is rotatably connected to the rotating ring 103 and is located on the inner ring of the rotating ring 103, the rotating ring 103 is a functional component that rotatably connects the connecting tube 104 and the main body 101, and the connecting tube 104 is the main component that cooperates with the connecting column 105 to connect the whole with the motor.

[0024] Secondly, the connecting column 105 is detachably connected to the connecting tube 104 and is located inside the connecting tube 104, the extension column 106 is detachably connected to the connecting column 105 and is located below the connecting column 105, the mounting plate 107 is detachably connected to the extension column 106 and is located below the extension column 106, the extension column 106 is a component that facilitates leaving a gap between the mounting plate 107 and the main body 101, and the extension column 106 is a structural component that connects the connecting column 105 and the mounting plate 107, and the mounting plate 107 is an auxiliary functional component that places the whole on the permanent magnet motor.

[0025] At the same time, the connecting cavity 109 is detachably connected to the fixing plate 108 and is located inside the fixing plate 108. The fixing plate 108 is detachably connected to the connecting column 105 and is located above the connecting column 105. The connecting column 105 is arranged inside the connecting cavity 109. The fixing plate 108 will cooperate with the connecting cavity 109 to fix the fixing plate 108 to the structural components on the connecting column 105 and the main body 101, thereby effectively preventing the connecting column 105 and the connecting tube 104 from falling off.

[0026] During the long-term use of the utility model, since the permanent magnet 110 is U-shaped and fixedly connected to the main body 101, and the magnetic air slot 111 is arranged on one side of the permanent magnet 110, a built-in hybrid PMSM rotor magnetic circuit structure is formed. While retaining the original beneficial effects, the built-in PMSM is increased in horizontal direction (q axis) inductance greater than vertical direction (d axis) inductance compared with the original structure, which is beneficial to weak magnetic field speed increase. Since the permanent magnet is buried inside the rotor core, the rotor structure is more solid, and it is easy to improve the safety of high-speed rotation of the motor. The advantages of greater integrity and greater magnetic flux per pole and smaller leakage coefficient, no need to take isolation measures, easy control of pole arc coefficient, high rotor strength, and non-deformation of permanent magnets will actively and effectively solve the current market mostly uses surface mount technology to connect permanent magnets to the rotor shaft, and the surface mount technology has certain defects. For example, when the motor is stopped suddenly, the permanent magnet will inevitably shake, and thus it will not be possible to guarantee the subsequent ideal use of the rotor during long-term use. In addition, the surface mount technology is not as safe as the built-in PMSM rotor magnetic circuit structure.

[0027] Second embodiment

[0028] See also Figure 4 , Figure 4 It is a schematic diagram of the overall structure of the second embodiment of the utility model.

[0029] On the basis of the first embodiment, a rotor structure of a permanent magnet motor of the utility model further includes a mounting hole 201 , a mounting block 202 , a fixing block 203 and a control slot 204 .

[0030] According to this specific embodiment, the mounting hole 201 is detachably connected to the mounting plate 107 and is located inside the mounting plate 107, the mounting block 202 is detachably connected to the mounting plate 107 and is located inside the mounting plate 107, and the mounting block 202 is arranged inside the mounting hole 201, the fixing block 203 is detachably connected to the mounting block 202 and is located above the mounting block 202, the control groove 204 is fixedly connected to the fixing block 203 and is located at the inner center of the fixing block 203, when the mounting plate 107 needs to be stably connected to the motor or the stator, the mounting block 202 is installed in the mounting hole 201, and then the fixing block 203 is controlled by the control groove 204 to fix the mounting block 202, thereby effectively and stably mounting the mounting plate 107 on the housing or the stator of the motor.

[0031] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope covered by the utility model.

Claims

1. A rotor structure of a permanent magnet motor, comprising a main body, characterized in that: It also includes a built-in hybrid permanent magnet component, which includes a permanent magnet, a magnetic isolation air groove and a placement cavity. The permanent magnet is fixedly connected to the main body and is located inside the main body. The magnetic isolation air groove is fixedly connected to the main body and is located inside the main body, and the magnetic isolation air groove is arranged on one side of the permanent magnet. The placement cavity is detachably connected to the main body and is located in the center of the interior of the main body.

2. The rotor structure of the permanent magnet motor according to claim 1, characterized in that: The built-in hybrid permanent magnet assembly also includes a rotating ring and a connecting tube. The rotating ring is rotatably connected to the main body and is located inside the main body. The rotating ring is arranged inside the placement cavity. The connecting tube is rotatably connected to the rotating ring and is located on the inner ring of the rotating ring.

3. The rotor structure of the permanent magnet motor according to claim 2, characterized in that: The built-in hybrid permanent magnet assembly also includes a connecting column, an extension column and a mounting plate. The connecting column is detachably connected to the connecting cylinder and is located inside the connecting cylinder. The extension column is detachably connected to the connecting column and is located below the connecting column. The mounting plate is detachably connected to the extension column and is located below the extension column.

4. The rotor structure of the permanent magnet motor according to claim 3, characterized in that: The built-in hybrid permanent magnet assembly includes a fixing plate and a connecting cavity, wherein the connecting cavity is detachably connected to the fixing plate and is located inside the fixing plate, the fixing plate is detachably connected to the connecting column and is located above the connecting column, and the connecting column is arranged inside the connecting cavity.

5. The rotor structure of the permanent magnet motor according to claim 4, characterized in that: The rotor structure of the permanent magnet motor also includes a mounting hole, a mounting block, a fixed block and a control groove, wherein the mounting hole is detachably connected to the mounting plate and is located inside the mounting plate, the mounting block is detachably connected to the mounting plate and is located inside the mounting plate, and the mounting block is arranged inside the mounting hole, the fixed block is detachably connected to the mounting block and is located above the mounting block, and the control groove is fixedly connected to the fixed block and is located in the center inside the fixed block.

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