Motor magnetic pole structure

Abstract

The utility model relates to the technical field of motors, in particular to a motor magnetic pole structure, which comprises a stator assembly and a rotor assembly which are arranged in a motor shell, the rotor assembly is arranged in the stator assembly, and the rotor assembly is rotatably connected with the motor shell; the stator assembly comprises a stator core and a plurality of stator windings, and the stator windings are arranged on the inner ring of the stator assembly; the rotor assembly comprises a rotor iron core, a rotating shaft, a fixing cover and a plurality of permanent magnets, the permanent magnets are arranged on the periphery of the rotor iron core at intervals, a plurality of magnetic isolation bridges are formed on the periphery of the rotor iron core in a protruding mode, embedding grooves are formed in the magnetic isolation bridges, embedding blocks are arranged on an inner ring of the fixing cover, the fixing cover wraps the outer sides of the permanent magnets, the embedding blocks are clamped and embedded in the embedding grooves, and the rotating shaft is arranged on the rotating shaft. Through cooperation of the fixing cover and the magnetic isolation bridge, a mechanical fixing structure can be added to the permanent magnet, radial fixing and circumferential fixing of the permanent magnet are achieved, and the centrifugal force resistance of the permanent magnet is improved through the cooperation structure of the embedding groove and the embedding block.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a motor magnetic pole structure. Background Technology

[0002] In existing permanent magnet synchronous motor structures, permanent magnets are mostly fixed using adhesive or strapping methods, which suffers from poor fixation reliability under high-temperature environments. Traditional magnetic bridge designs have suboptimal magnetic circuit paths, resulting in high leakage flux coefficients and affecting torque density. Rotor cooling relies heavily on end-mounted air cooling, and the axial heat dissipation channel design is inadequate, causing the permanent magnet operating temperature to frequently exceed the critical value of 80℃. Stator winding positioning mainly relies on slot wedge fixation, which carries the risk of winding displacement under high-frequency vibration. The stator core and housing often use an interference fit, and assembly stress can easily lead to degradation of the core's magnetic properties. Utility Model Content

[0003] The technical problem to be solved by this utility model is: in order to overcome the problem that the permanent magnets in the prior art are mostly fixed by adhesive or strapping, which has poor fixing reliability under high temperature environment, a motor magnetic pole structure is provided.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a motor magnetic pole structure, including a stator assembly and a rotor assembly arranged in the motor housing, the rotor assembly being arranged in the stator assembly, and there is a rotational clearance between the rotor assembly and the stator assembly, and the rotor assembly being rotatably connected to the motor housing.

[0005] The stator assembly includes a stator core and several stator windings, which are arranged in the inner ring of the stator assembly.

[0006] The rotor assembly includes a rotor core, a shaft, a fixed cover, and several permanent magnets. The permanent magnets are spaced apart on the outer periphery of the rotor core. Several magnetic isolation bridges protrude from the outer periphery of the rotor core, and the gaps between the magnetic isolation bridges and adjacent permanent magnets are arranged accordingly. The magnetic isolation bridges are located within the gaps between the two adjacent permanent magnets they correspond to. The magnetic isolation bridges have fitting grooves. The inner ring of the fixed cover has fitting blocks that match the fitting grooves. The fixed cover covers the outside of the permanent magnets, and the fitting blocks are fitted into the fitting grooves. Through the cooperation of the fixed cover and the magnetic isolation bridges, a mechanical fixing structure can be added to the permanent magnets, realizing radial and circumferential fixing of the permanent magnets. Moreover, the cooperation structure between the fitting grooves and the fitting blocks improves the centrifugal force resistance of the permanent magnets.

[0007] To address the problem of magnetic circuit asymmetry caused by axial displacement of the rotor core, the rotor assembly further includes two positioning plates, with the rotor core positioned between the two positioning plates. The end face of the rotor core has mounting holes, and the positioning plates are connected to the rotor core via bolts and mounting holes.

[0008] To address the problem of insufficient axial heat dissipation efficiency of the rotor, the rotor core end face is further provided with several cooling channels around the shaft, which extend axially.

[0009] The rotor core is further provided with a converging flow channel on its end face, which is used to connect the cooling flow channel and to place the rotating connector for the cooling equipment.

[0010] Furthermore, the inner ring of the stator core has several protruding locking parts, each corresponding to a stator winding, with the stator winding arranged on its corresponding locking part.

[0011] To address the issue of core deformation caused by stator assembly stress, the stator core is further provided with a protruding mounting portion on its outer ring, and a mounting groove matching the mounting portion is provided on the inner wall of the motor housing, with the mounting portion positioned within the mounting groove.

[0012] The beneficial effects of this utility model are: the motor magnetic pole structure provided by this utility model, through the cooperation of the fixing cover and the magnetic isolation bridge, can add a mechanical fixing structure to the permanent magnet, realize the radial and circumferential fixing of the permanent magnet, and the cooperation structure of the interlocking groove and the interlocking block improves the centrifugal force resistance of the permanent magnet. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a utility model Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0016] Figure 3 This is a utility model Figure 1 Schematic diagram of the cross-sectional structure at point BB;

[0017] Figure 4 This is a utility model Figure 3 A magnified structural diagram at point C.

[0018] In the diagram: 1. Motor housing; 11. Mounting slot; 2. Stator assembly; 21. Stator core; 22. Stator winding; 23. Snap-fit ​​part; 24. Mounting part; 3. Rotor assembly; 31. Rotor core; 311. Mounting hole; 312. Cooling channel; 313. Merging channel; 32. Shaft; 33. Fixing cover; 331. Fitting block; 34. Permanent magnet; 35. Magnetic bridge; 351. Fitting slot; 36. Positioning piece. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0020] like Figure 1 This is a schematic diagram of the structure of the present invention. A motor magnetic pole structure includes a stator assembly 2 and a rotor assembly 3 arranged in a motor housing 1. The rotor assembly 3 is arranged in the stator assembly 2, and there is a rotational clearance between the rotor assembly 3 and the stator assembly 2. The rotor assembly 3 and the motor housing 1 are rotatably connected.

[0021] The stator assembly 2 includes a stator core 21 and a plurality of stator windings 22, which are arranged in the inner ring of the stator assembly 2.

[0022] like Figure 3 , 4 As shown, the rotor assembly 3 includes a rotor core 31, a shaft 32, a fixing cover 33, and several permanent magnets 34. The permanent magnets 34 are spaced apart on the outer periphery of the rotor core 31. Several magnetic isolation bridges 35 protrude from the outer periphery of the rotor core 31. The gaps between the magnetic isolation bridges 35 and adjacent permanent magnets 34 are correspondingly arranged. The magnetic isolation bridges 35 are located in the gaps between the two adjacent permanent magnets 34 they correspond to. The magnetic isolation bridges 35 are provided with fitting grooves 351. The inner ring of the fixing cover 33 has fitting blocks 331 that match the fitting grooves 351. The fixing cover 33 covers the outside of the permanent magnets 34. The fitting blocks 331 are fitted into the fitting grooves 351. Through the cooperation of the fixing cover 33 and the magnetic isolation bridges 35, a mechanical fixing structure can be added to the permanent magnets 34 to achieve radial and circumferential fixing of the permanent magnets. Moreover, the cooperation structure between the fitting grooves 351 and the fitting blocks 331 improves the centrifugal force resistance of the permanent magnets.

[0023] like Figure 2 As shown, the rotor assembly 3 includes two positioning plates 36, and the rotor core 31 is arranged between the two positioning plates 36. The end face of the rotor core 31 has mounting holes 311. The positioning plates 36 are connected to the rotor core 31 by bolts and mounting holes 311. The double positioning plate 36 structure fixes the permanent magnet 34 axially.

[0024] like Figure 3 , 4 As shown, a plurality of cooling channels 312 are formed around the rotating shaft 32 on the end face of the rotor core 31. The cooling channels 312 extend axially and reduce the temperature of the rotor core 31. A converging channel 313 is formed on the end face of the rotor core 31. The converging channel 313 is used to connect the cooling channels 312 and to place the rotating connector for the cooling equipment. The converging channel 313 realizes the efficient injection of cooling medium in the rotating state.

[0025] like Figure 3, 4 As shown, a number of snap-fit ​​parts 23 protrude from the inner ring of the stator core 21. The snap-fit ​​parts 23 correspond one-to-one with the stator windings 22. The stator windings 22 are arranged on their corresponding snap-fit ​​parts 23, thereby increasing the installation efficiency of the stator core 21.

[0026] A mounting portion 24 protrudes from the outer ring of the stator core 21. The inner wall of the motor housing 1 has a mounting groove 11 that matches the mounting portion 24. The mounting portion 24 is arranged in the mounting groove 11 to eliminate the core deformation caused by stator assembly stress.

[0027] Working process: After the motor is powered on, the stator winding 22 generates a rotating magnetic field, driving the rotor assembly 3 to rotate. The fixed cover 33 maintains the stability of the permanent magnet at a speed of 6000 rpm through the mechanical interlock between the fitting block 331 and the magnetic isolation bridge 35. The coolant is injected into the confluence channel 313 through the rotating connector, and forms turbulent heat transfer along the axial cooling channel 312, keeping the working temperature of the permanent magnet 34 below 65℃. The positioning plate 36 ensures the axial positioning of the permanent magnet 34 through the bolt preload. The trapezoidal cross-section design of the snap-fit ​​part 23 ensures that the winding remains stable when subjected to electromagnetic force of 2000 Hz. The cooperation between the mounting part 24 and the mounting groove 11 of the motor housing 1 achieves accurate positioning of the stator.

[0028] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A magnetic pole structure for an electric motor, characterized in that, It includes a stator assembly (2) and a rotor assembly (3) arranged in a motor housing (1), the rotor assembly (3) being arranged in the stator assembly (2), and there is a rotational clearance between the rotor assembly (3) and the stator assembly (2), and the rotor assembly (3) and the motor housing (1) are rotatably connected. The stator assembly (2) includes a stator core (21) and a plurality of stator windings (22), the stator windings (22) being arranged in the inner ring of the stator assembly (2); The rotor assembly (3) includes a rotor core (31), a shaft (32), a fixed cover (33), and a plurality of permanent magnets (34). The permanent magnets (34) are spaced apart on the outer periphery of the rotor core (31). A plurality of magnetic isolation bridges (35) are protruding on the outer periphery of the rotor core (31). The gaps between the magnetic isolation bridges (35) and two adjacent permanent magnets (34) are arranged accordingly. The magnetic isolation bridges (35) are located in the gaps between the two adjacent permanent magnets (34) they correspond to. The magnetic isolation bridges (35) are provided with fitting grooves (351). The inner ring of the fixed cover (33) has fitting blocks (331) that match the fitting grooves (351). The fixed cover (33) covers the outside of the permanent magnets (34), and the fitting blocks (331) are fitted into the fitting grooves (351).

2. The motor magnetic pole structure as described in claim 1, characterized in that: The rotor assembly (3) includes two positioning plates (36), and the rotor core (31) is arranged between the two positioning plates (36). The rotor core (31) has mounting holes (311) on its end face. The positioning plates (36) are connected to the rotor core (31) by bolts and mounting holes (311).

3. The motor magnetic pole structure as described in claim 1, characterized in that: The rotor core (31) has several cooling channels (312) on its end face around the shaft (32), and the cooling channels (312) extend axially.

4. The motor magnetic pole structure as described in claim 3, characterized in that: The rotor core (31) has a confluence channel (313) on its end face. The confluence channel (313) is used to connect the cooling channel (312) and to place the rotating connector for the cooling equipment.

5. The motor magnetic pole structure as described in claim 1, characterized in that: The inner ring of the stator core (21) has a plurality of snap-fit ​​parts (23) protruding out, and the snap-fit ​​parts (23) correspond one-to-one with the stator windings (22), and the stator windings (22) are arranged on their corresponding snap-fit ​​parts (23).

6. The motor magnetic pole structure as described in claim 1, characterized in that: The stator core (21) has a protruding mounting part (24) on its outer ring, and the inner wall of the motor housing (1) has a mounting groove (11) that matches the mounting part (24), and the mounting part (24) is arranged in the mounting groove (11).

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