Surface-mounted magnetic pole rotor of permanent magnet motor

Abstract

The invention relates to a permanent magnet motor surface-mounted magnetic pole rotor, which comprises a rotating shaft, a rotor bracket and a plurality of permanent magnet groups, and is characterized in that the rotor bracket is in key connection with the rotating shaft; a plurality of permanent magnet groups are uniformly arranged along the circumferential direction of the rotating shaft, each permanent magnet group comprises a plurality of permanent magnets arranged along the axial direction of the rotating shaft, the center lines of any two adjacent permanent magnets in each permanent magnet group are staggered, and the plurality of permanent magnets are adhered to the outer wall of the rotor bracket; a plurality of permanent magnets can be arranged on the outer wall of the rotor support in a pasting mode, the rotor support comprises a plurality of support single bodies, the support single bodies are staggered by corresponding angles, skewed poles can be easily achieved, the assembly precision is high, a skewed slot complex process is replaced, and the cogging torque and vibration of the motor are effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a surface-mounted magnetic pole rotor for a permanent magnet motor. Background Art

[0002] With the continuous development of industrial technology, high-performance permanent magnet motors are widely used in various industries due to their compact structure, high efficiency, high power density, high torque density, etc. Affected by the characteristics of the motor stator slot structure, the motor rotor will generate tooth harmonics and slot torque during rotation, which will cause motor vibration and noise. In order to eliminate the motor tooth harmonics and slot torque, stator skew slots or rotor skew pole technology is usually used.

[0003] The permanent magnet motor rotor is provided with permanent magnets, which are generally segmented structures and cannot use skewed slots like the asynchronous motor rotor. Therefore, most of them use rotor straight slots and stator skewed slots.

[0004] However, in actual production, the stator slot process is relatively complicated and has high labor costs. In addition, the slot process will increase the difficulty of wire embedding. At the same time, the existing permanent magnet motor rotor pole skewing method is achieved by opening key slots at different angles on the rotor yoke. This method makes the rotor yoke difficult to process, the precision requirements are too high, and the permanent magnet assembly is complicated. Summary of the invention

[0005] In view of this, it is necessary to provide a permanent magnet motor surface-mounted pole rotor to solve the problems of complex stator slot process and high labor cost. In addition, the slot process will increase the difficulty of wire embedding. At the same time, the existing permanent magnet motor rotor pole skewing method is achieved by opening keyways at different angles of the rotor yoke. This method makes the rotor yoke difficult to process, the precision requirements are too high, and the permanent magnet assembly is complicated.

[0006] The present invention provides a surface-mounted magnetic pole rotor for a permanent magnet motor, comprising a rotating shaft, a rotor bracket and a plurality of permanent magnet groups, wherein the rotor bracket is key-connected to the rotating shaft; the plurality of permanent magnet groups are evenly arranged along the circumference of the rotating shaft, each of the permanent magnet groups comprises a plurality of permanent magnets arranged along the axial direction of the rotating shaft, the center lines of any two adjacent permanent magnets in each of the permanent magnet groups are staggered, and the plurality of permanent magnets are all adhered to the outer wall of the rotor bracket.

[0007] Furthermore, the rotor bracket includes a plurality of bracket monomers, and the plurality of bracket monomers are arranged in sequence along the length direction of the rotating shaft, the thickness of the bracket monomer is equal to the thickness of the permanent magnet, the plurality of permanent magnets in each permanent magnet group correspond one-to-one to the plurality of bracket monomers, and the outer wall of each bracket monomer is pasted with the corresponding permanent magnets in the plurality of permanent magnet groups.

[0008] Furthermore, the pole rotor also includes a plurality of pole pressing blocks, and a plurality of the pole pressing blocks are arranged on the outer wall of each of the bracket monomers. The plurality of pole pressing blocks are evenly arranged along the circumference of the bracket monomer and are detachably connected. A fixed gap is formed between two adjacent pole pressing blocks and the bracket monomer, and the permanent magnet is embedded in the corresponding fixed gap.

[0009] Furthermore, a plurality of grooves are provided on the outer wall of the bracket monomer, and a plurality of the magnetic pole pressing blocks are respectively embedded in the plurality of the grooves, and each of the magnetic pole pressing blocks is connected to the bracket monomer via a connecting screw.

[0010] Furthermore, the side of the permanent magnet away from the bracket monomer is an arc-shaped surface, and the vertical distance from the middle of the arc-shaped surface to the bracket monomer gradually decreases toward both sides, and the magnetic pole pressing block is a T-shaped block.

[0011] Furthermore, the permanent magnet is bonded to the rotor bracket via glue.

[0012] Furthermore, a key groove is provided on the inner wall of the plurality of bracket monomers, and the key grooves of the plurality of bracket monomers are connected with a single key shrink fit provided on the outer wall of the rotating shaft.

[0013] Furthermore, the plurality of grooves on any of the bracket monomers do not overlap with the plurality of grooves on the adjacent bracket monomers, and the grooves on the plurality of bracket monomers are offset along the circumferential direction of the rotating shaft.

[0014] Furthermore, it also includes two parallel and annular rotor end plates, the two rotor end plates are fixedly arranged on both sides of the rotor bracket and abut against both sides of the plurality of permanent magnet groups.

[0015] Furthermore, it also includes a limit screw connecting the rotor end plate and the rotor bracket.

[0016] Compared with the existing technology, multiple permanent magnets can be arranged on the outer wall of the rotor bracket by pasting, which can easily achieve pole tilting with high assembly accuracy, replace the complex process of tilting slots, and effectively reduce the motor tooth torque and vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the overall structure of a surface-mounted magnetic pole rotor of a permanent magnet motor provided in an embodiment of the present invention; Figure 2 A schematic diagram of the installation of a magnetic pole pressing block in a surface-mounted magnetic pole rotor of a permanent magnet motor provided by an embodiment of the present invention; Figure 3 A schematic diagram of the installation of a rotor end plate in a surface-mounted magnetic pole rotor of a permanent magnet motor provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0019] like Figure 1 As shown, the present invention provides a surface-mounted magnetic pole rotor for a permanent magnet motor, comprising a rotating shaft 100, a rotor bracket 200 and a plurality of permanent magnet groups 300, wherein the rotor bracket 200 is key-connected to the rotating shaft 100; the plurality of permanent magnet groups 300 are evenly arranged along the circumference of the rotating shaft 100, and each permanent magnet group 300 comprises a plurality of permanent magnets 300 arranged along the axial direction of the rotating shaft 100, and the center lines of any two adjacent permanent magnets 300 in each permanent magnet group 300 are staggered, and the plurality of permanent magnets 300 are all adhered to the outer wall of the rotor bracket 200.

[0020] During implementation, multiple permanent magnets 300 can be arranged on the outer wall of the rotor bracket 200 by pasting, which can easily achieve pole tilting with high assembly accuracy, replace the complex process of tilting slots, and effectively reduce the motor cogging torque and vibration.

[0021] The rotating shaft 100 in this embodiment is connected to the rotor support 200 for transmitting torque.

[0022] The rotor support 200 in this embodiment is key-connected to the rotating shaft 100 .

[0023] In one embodiment, the rotor support 200 includes a plurality of support monomers, which are arranged in sequence along the length direction of the rotating shaft 100, the thickness of the support monomers is equal to the thickness of the permanent magnets 300, the plurality of permanent magnets 300 in each permanent magnet 300 group correspond to the plurality of support monomers one by one, and the outer wall of each support monomer is pasted with the corresponding permanent magnets 300 in the plurality of permanent magnet 300 groups. Among them, by staggering the plurality of support monomers at corresponding angles, the inclined poles can be easily realized with high assembly accuracy, replacing the complex process of the inclined slot.

[0024] The permanent magnet 300 is bonded to the rotor bracket 200 via glue.

[0025] However, it is difficult to ensure the stability of the connection between the rotor bracket 200 and the permanent magnet 300 by relying solely on the adhesive force of the glue. Figure 2 As shown, in one embodiment, the magnetic pole rotor also includes a plurality of magnetic pole pressing blocks 400, and a plurality of magnetic pole pressing blocks 400 are arranged on the outer wall of each bracket monomer. The plurality of magnetic pole pressing blocks 400 are evenly arranged along the circumference of the bracket monomer and are detachably connected. A fixed gap is formed between two adjacent magnetic pole pressing blocks 400 and the bracket monomer, and the permanent magnet 300 is embedded in the corresponding fixed gap.

[0026] Among them, by means of the magnetic pole pressing block 400 disposed on the rotor bracket 200, the bracket monomer located between the two magnetic pole pressing blocks 400 can be pressed against the outer wall of the rotor bracket 200, and at the same time, the circumferential position of the permanent magnet can be limited.

[0027] To achieve the connection between the pole pressing block 400 and the bracket unit, a plurality of grooves 210 are provided on the outer wall of the bracket unit in this embodiment, and the plurality of pole pressing blocks 400 are respectively embedded in the plurality of grooves 210 , and each pole pressing block 400 is connected to the bracket unit via a connecting screw 410 .

[0028] In order to facilitate the connection between the rotating shaft 100 and multiple bracket monomers, key grooves 220 are opened on the inner walls of the multiple bracket monomers. The key grooves 220 of the multiple bracket monomers are matched and connected with the single-key shrink sleeve 110 set on the outer wall of the rotating shaft 100, and the axial position of the multiple bracket monomers of the shaft can be limited by a locking nut.

[0029] To form the above-mentioned oblique pole, the multiple grooves 210 on any bracket monomer in this embodiment do not overlap with the multiple grooves 210 on the adjacent bracket monomer, and the grooves 210 on the multiple bracket monomers are offset along the circumferential direction of the rotating shaft 100. Through the above-mentioned arrangement, during the assembly process, the oblique pole can be achieved by simply aligning the key slots 220 of the multiple bracket monomers.

[0030] In this embodiment, the side of the permanent magnet 300 away from the bracket unit is an arc-shaped surface, and the vertical distance from the center of the arc-shaped surface to the bracket unit gradually decreases toward both sides, and the magnetic pole pressing block 400 is a T-shaped block.

[0031] Of course, in other preferred embodiments, the pole pressing block 400 may also adopt other shapes, preferably a shape that can stably press the permanent magnet 300 and limit the circumferential position of the permanent magnet 300 .

[0032] like Figure 3 As shown, in order to limit the axial position of the permanent magnet 300 group, i.e., the plurality of permanent magnets 300, along the rotating shaft 100, the present embodiment further includes two parallel and annular rotor end plates 310, which are fixedly disposed on both sides of the rotor support 200 and abut against both sides of the plurality of permanent magnet 300 groups. The present embodiment further includes a stop screw 320 connecting the rotor end plate 310 and the rotor support 200, so as to realize the connection between the rotor end plate 310 and the rotor support 200.

[0033] Compared with the prior art: multiple permanent magnets 300 can be arranged on the outer wall of the rotor bracket 200 by pasting, which can easily achieve pole tilting with high assembly accuracy, replace the complex process of tilting slots, and effectively reduce the motor cogging torque and vibration.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A permanent magnet motor surface mounted pole rotor, characterized in that: include: Rotating shaft; A rotor support, which is key-connected to the rotating shaft; A plurality of permanent magnet groups are evenly arranged along the circumference of the rotating shaft, each of the permanent magnet groups includes a plurality of permanent magnets arranged along the axial direction of the rotating shaft, the center lines of any two adjacent permanent magnets in each permanent magnet group are staggered, and the plurality of permanent magnets are all adhered to the outer wall of the rotor bracket.

2. The surface-mounted magnetic pole rotor of a permanent magnet motor according to claim 1, characterized in that: The rotor bracket includes a plurality of bracket monomers, which are arranged in sequence along the length direction of the rotating shaft. The thickness of the bracket monomers is equal to the thickness of the permanent magnets. The plurality of permanent magnets in each permanent magnet group correspond one-to-one to the plurality of bracket monomers, and the outer wall of each bracket monomer is pasted with the corresponding permanent magnets in the plurality of permanent magnet groups.

3. The surface-mounted magnetic pole rotor of a permanent magnet motor according to claim 2, characterized in that: The magnetic pole rotor also includes a plurality of magnetic pole pressing blocks, each of which is provided with a plurality of magnetic pole pressing blocks on the outer wall of the bracket monomer, and the plurality of magnetic pole pressing blocks are evenly arranged along the circumference of the bracket monomer and are detachably connected, a fixed gap is formed between two adjacent magnetic pole pressing blocks and the bracket monomer, and the permanent magnet is embedded in the corresponding fixed gap.

4. The surface-mounted magnetic pole rotor of a permanent magnet motor according to claim 3, characterized in that: A plurality of grooves are formed on the outer wall of the bracket monomer, and a plurality of magnetic pole pressing blocks are respectively embedded in the plurality of grooves, and each of the magnetic pole pressing blocks is connected to the bracket monomer via a connecting screw.

5. The surface-mounted magnetic pole rotor of a permanent magnet motor according to claim 3, characterized in that: The side of the permanent magnet away from the bracket monomer is an arc-shaped surface, and the vertical distance from the middle of the arc-shaped surface to the bracket monomer gradually decreases toward both sides, and the magnetic pole pressing block is a T-shaped block.

6. The surface-mounted magnetic pole rotor of a permanent magnet motor according to claim 1, characterized in that: The permanent magnet is bonded to the rotor bracket via glue.

7. The surface-mounted magnetic pole rotor of a permanent magnet motor according to claim 4, characterized in that: A key groove is provided on the inner wall of the plurality of bracket monomers, and the key grooves of the plurality of bracket monomers are connected with a single key shrink fit provided on the outer wall of the rotating shaft.

8. The surface-mounted magnetic pole rotor of a permanent magnet motor according to claim 7, characterized in that: The plurality of grooves on any of the bracket monomers do not overlap with the plurality of grooves on the adjacent bracket monomers, and the grooves on the plurality of bracket monomers are offset along the circumferential direction of the rotating shaft.

9. The surface-mounted magnetic pole rotor of a permanent magnet motor according to claim 1, characterized in that: It also includes two parallel and annular rotor end plates, which are fixedly arranged on both sides of the rotor bracket and abut against both sides of the plurality of permanent magnet groups.

10. The surface-mounted magnetic pole rotor of a permanent magnet motor according to claim 9, characterized in that: It also includes a limit screw connecting the rotor end plate and the rotor bracket.

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