A high power magnetic circuit structure for suppressing electromagnetic force fluctuations
Patent Information
- Application Number
- CN202521808120.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-25
- Publication Date
- 2026-10-20
- Estimated Expiration
- 2035-08-25
AI Technical Summary
[0003]无刷电机功率密度依赖于其气隙磁密，气隙磁密度越大，电机的功率密度越大，但较大的气隙磁密度一方面会带来较大的电磁转矩波动，影响电机的振动噪音，另一方面在电机的永磁体内产生环流，增加较大的永磁体涡流损耗，造成效率的降低
[0010]与现有技术相比本实用新型的有益效果为：通过将转子组件上设置电极结构，有效的增加气隙磁通密度，降低永磁体涡流损耗，增加了永磁体间的电阻值，该结构可以极大的增加电机的气隙磁密度，并通过电磁结构的改善降低转矩波动和永磁体涡流。
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Figure CN224874874U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of magnetic circuit structures, and in particular to a high-power magnetic circuit structure for suppressing electromagnetic force fluctuations. Background Technology
[0002] In modern industry and technology, high-power magnetic circuit structures, as core components, are widely used in key areas such as motor drives, power conversion, magnetic levitation transportation, particle accelerators, and medical imaging equipment (e.g., MRI scanners). These applications not only require magnetic circuit structures to possess high energy density and high-efficiency conversion capabilities, but also impose stringent standards on their operational stability and reliability. Among these, the effective suppression of electromagnetic force fluctuations is one of the key factors in ensuring the long-term stable operation of the magnetic circuit system and improving equipment performance and lifespan.
[0003] The power density of a brushless motor depends on its air gap magnetic flux density. The higher the air gap magnetic flux density, the higher the power density of the motor. However, a larger air gap magnetic flux density will bring about a larger electromagnetic torque fluctuation, affecting the vibration and noise of the motor. On the other hand, it will generate circulating currents in the permanent magnet of the motor, increasing the eddy current loss of the permanent magnet and causing a reduction in efficiency. Utility Model Content
[0004] To solve the above-mentioned technical problems, this utility model provides a high-power magnetic circuit structure that can greatly increase the air gap magnetic density of the motor and reduce torque fluctuations and suppress electromagnetic force fluctuations through improvements in the electromagnetic structure and permanent magnet eddy currents.
[0005] This invention discloses a high-power magnetic circuit structure for suppressing electromagnetic force fluctuations, comprising a housing, a stator core assembly, and a rotor assembly. The rotor assembly is disposed inside the stator core assembly and mounted on the inner wall of the housing. It also includes internal potting compound, bearing retaining rings, a first bearing, a rotor retaining ring, a second bearing, and a shaft. The internal potting compound is disposed in the lower part of the housing. The bearing retaining rings, the first bearing, and the second bearing are fitted onto the inner wall of the housing. The lower part of the shaft is mounted on the bearing retaining rings, the first bearing, and the second bearing. The rotor assembly is mounted on the outer wall of the shaft. The rotor retaining ring is mounted at the bottom of the rotor assembly, and an electrode structure is provided on the rotor assembly. By providing an electrode structure on the rotor assembly, the air gap magnetic flux density is effectively increased, permanent magnet eddy current losses are reduced, and the resistance between permanent magnets is increased. This structure can greatly increase the air gap magnetic density of the motor and reduce torque fluctuations and permanent magnet eddy currents through improvements in the electromagnetic structure.
[0006] Preferably, the rotor assembly includes a rotor core and magnetic tiles. Multiple sets of rotor cores are interconnected, and multiple sets of magnetic tiles are respectively disposed on multiple sets of rotor cores. The multiple sets of magnetic tiles and the grooves on the stator core assembly form the electrode structure. This electrode structure is a rotor core slot and a rotor balance block pole. Each magnetic tile is composed of two tangential lines at both ends and two reverse V-shapes on both sides. The left side of the tangential magnetic tile is the N pole, and the right side of the tangential magnetic tile is the S pole. In the two magnetic tiles, the inner side of the left magnetic tile is the S pole, the outer side of the left magnetic tile is the N pole, the outer side of the right magnetic tile is the S pole, and the inner side of the right magnetic tile is the N pole. The above structure can increase the air gap magnetic flux density, and the segmented design of the magnetic tiles can reduce eddy current losses.
[0007] Preferably, the angle between the two magnetic tiles and the center line is 50 degrees. There are balancing slots on the outer side of the two magnetic tiles, with slot sizes of 0.5*0.6, 0.5*1, and 0.5*0.6. At the same time, there are harmonic slots for reducing the magnetomotive force of the permanent magnet on the outer side of the reverse V-shape of the two magnetic tiles. The entire rotor core is divided into four sections, each of which is offset by 7.5 degrees. This structure can effectively reduce torque harmonics and torque fluctuations, thereby reducing the vibration and noise of the motor. At the same time, the segmented design of the rotor core can reduce eddy current losses, and the design of the balancing slots and the segmented skewed poles of the rotor core can reduce torque fluctuations.
[0008] Preferably, the rotor core has weight-reducing slots and magnetic isolation slots, with the heart-shaped slots on both sides being weight-reducing slots and the inner side being magnetic isolation slots; this effectively reduces magnetic leakage.
[0009] Preferably, it also includes a lower rotor balance block and an upper rotor balance block, which are respectively installed on the upper and lower sides of the rotor assembly; thereby improving the rotational stability of the rotor assembly and reducing noise.
[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting an electrode structure on the rotor assembly, the air gap magnetic flux density is effectively increased, the permanent magnet eddy current loss is reduced, and the resistance value between permanent magnets is increased. This structure can greatly increase the air gap magnetic density of the motor, and reduce torque fluctuation and permanent magnet eddy current through the improvement of the electromagnetic structure. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the isometric structure of this utility model; Figure 2 This is a partial isometric structural diagram showing the connection between the shell and the internal potting compound; Figure 3 This is a partial isometric structural diagram of the connection between the housing and the stator core assembly, etc. Figure 4 This is a top view schematic diagram of the connection between the rotor core and the magnets, etc. Figure 5 This is a schematic diagram of the structure of the magnetic tile; Figure 6 This is a schematic diagram of the isometric structure of the rotor core; Figure 7 This is a partial isometric structural diagram showing the connection between the stator core assembly and the rotor core.
[0012] The following are labels in the attached diagram: 1. Housing; 2. Internal potting compound; 3. Bearing retainer ring; 4. First bearing; 5. Rotor retainer ring; 6. Stator core assembly; 7. Lower rotor balance block; 8. Second bearing; 9. Rotor assembly; 10. Upper rotor balance block; 11. Shaft; 12. Rotor core; 13. Magnet. Detailed Implementation
[0013] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete. Example 1
[0014] like Figures 1 to 7 As shown, this utility model discloses a high-power magnetic circuit structure for suppressing electromagnetic force fluctuations, including a housing 1, a stator core assembly 6, and a rotor assembly 9. The rotor assembly 9 is disposed inside the stator core assembly 6, which is mounted on the inner side wall of the housing 1. It also includes an internal potting compound 2, a bearing retaining ring 3, a first bearing 4, a rotor retaining ring 5, a second bearing 8, and a rotating shaft 11. The internal potting compound 2 is disposed in the lower part of the housing 1. The bearing retaining ring 3, the first bearing 4, and the second bearing 8 are fitted onto the inner side wall of the housing 1. The lower part of the rotating shaft 11 is mounted on the bearing retaining ring 3, the first bearing 4, and the second bearing 8. The rotor assembly 9 is mounted on the outer side wall of the rotating shaft 11. The rotor retaining ring 5 is mounted at the bottom of the rotor assembly 9, and an electrode structure is provided on the rotor assembly 9. like Figure 4 As shown, the rotor assembly 9 includes a rotor core 12 and magnetic tiles 13. Multiple sets of rotor cores 12 are interconnected, and multiple sets of magnetic tiles 13 are respectively disposed on multiple sets of rotor cores 12. The multiple sets of magnetic tiles 13 and the grooves on the stator core assembly 6 form the electrode structure. The electrode structure is a rotor core 12 slot rotor balance block 10 pole. Each magnetic tile 13 is composed of a tangential "I" shape at both ends and a reverse "V" shape on both sides. The left side of the tangential magnetic tile 13 is the N pole, and the right side of the tangential magnetic tile 13 is the S pole. Among the two magnetic tiles 13, the inner side of the left magnetic tile 13 is the S pole, the outer side of the left magnetic tile 13 is the N pole, the outer side of the right magnetic tile 13 is the S pole, and the inner side of the right magnetic tile 13 is the N pole. In this embodiment, by setting an electrode structure on the rotor assembly 9, the air gap magnetic flux density is effectively increased, the permanent magnet eddy current loss is reduced, and the resistance value between permanent magnets is increased. This structure can greatly increase the air gap magnetic density of the motor and reduce torque fluctuation and permanent magnet eddy current through the improvement of the electromagnetic structure. Example 2
[0015] Based on Example 1, such as Figure 4 As shown, this utility model discloses a high-power magnetic circuit structure for suppressing electromagnetic force fluctuations. The angle between the magnetic tiles 13 on both sides and the center line is 50 degrees. There are balance slots on the outer side of the magnetic tiles 13 on both sides, with slot sizes of 0.5*0.6, 0.5*1, and 0.5*0.6. At the same time, there are harmonic slots for reducing the magnetomotive force of the permanent magnet on the outer side of the reverse V-shaped magnetic tiles 13 on both sides. The entire rotor core 12 is divided into four sections, and each section of the rotor core 12 is offset by 7.5 degrees. like Figure 4 As shown, the rotor core 12 has weight-reducing slots and magnetic isolation slots inside, with the heart-shaped slots on both sides being weight-reducing slots and the magnetic isolation slots on the inner side. like Figure 3 As shown, it also includes a lower rotor balancing block 7 and an upper rotor balancing block 10, which are respectively installed on the upper and lower sides of the rotor assembly 9. In this embodiment, the above structure can increase the air gap magnetic flux density, and the segmented design of the magnetic tile 13 can reduce eddy current losses. This structure can effectively reduce torque harmonics and torque fluctuations, thereby reducing the vibration and noise of the motor. At the same time, the segmented design of the rotor core 12 can reduce eddy current losses, and the design of the balance slot and the skewed pole of the rotor core 12 can reduce torque fluctuations.
[0016] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A high-power magnetic circuit structure for suppressing electromagnetic force fluctuations, comprising a housing (1), a stator core assembly (6), and a rotor assembly (9), wherein the rotor assembly (9) is disposed inside the stator core assembly (6), and the stator core assembly (6) is mounted on the inner wall of the housing (1); characterized in that, It also includes an internal potting compound (2), a bearing retaining ring (3), a first bearing (4), a rotor retaining ring (5), a second bearing (8), and a rotating shaft (11). The internal potting compound (2) is located in the lower part of the housing (1). The bearing retaining ring (3), the first bearing (4), and the second bearing (8) are fitted together on the inner side wall of the housing (1). The lower part of the rotating shaft (11) is mounted on the bearing retaining ring (3), the first bearing (4), and the second bearing (8). The rotor assembly (9) is mounted on the outer side wall of the rotating shaft (11). The rotor retaining ring (5) is mounted on the bottom of the rotor assembly (9), and an electrode structure is provided on the rotor assembly (9).
2. The high-power magnetic circuit structure for suppressing electromagnetic force fluctuations as described in claim 1, characterized in that, The rotor assembly (9) includes a rotor core (12) and magnetic tiles (13). Multiple sets of rotor cores (12) are interconnected. Multiple sets of magnetic tiles (13) are respectively set on multiple sets of rotor cores (12). Multiple sets of magnetic tiles (13) and the grooves on the stator core assembly (6) form the electrode structure. The electrode structure is the rotor core (12) slot rotor balance block (10) pole. Each magnetic tile (13) is composed of a tangential line at both ends and a reverse V-shape on both sides. The left side of the tangential magnetic tile (13) is the N pole, and the right side of the tangential magnetic tile (13) is the S pole. In the magnetic tiles (13) on both sides, the inside of the left magnetic tile (13) is the S pole, the outside of the left magnetic tile (13) is the N pole, the outside of the right magnetic tile (13) is the S pole, and the inside of the right magnetic tile (13) is the N pole.
3. The high-power magnetic circuit structure for suppressing electromagnetic force fluctuations as described in claim 2, characterized in that, The angle between the two magnetic tiles (13) and the center line is 50 degrees. There are balance grooves on the outer side of the two magnetic tiles (13), with groove sizes of 0.5*0.6, 0.5*1, and 0.5*0.
6. At the same time, there are harmonic grooves to reduce the magnetomotive force of the permanent magnet on the outer side of the reverse V-shaped magnetic tiles (13). The entire rotor core (12) is divided into four sections, and each section of the rotor core (12) is offset by 7.5 degrees.
4. The high-power magnetic circuit structure for suppressing electromagnetic force fluctuations as described in claim 2, characterized in that, The rotor core (12) has a weight reduction slot and a magnetic isolation slot. The two sides are heart-shaped weight reduction slots and the inner side is a magnetic isolation slot.
5. The high-power magnetic circuit structure for suppressing electromagnetic force fluctuations as described in claim 1, characterized in that, It also includes a lower rotor balancing block (7) and an upper rotor balancing block (10), which are installed on the upper and lower sides of the rotor assembly (9), respectively.