Rotor structure, motor and compressor
By optimizing the structure and installation position of the balance block body, and using the design of magnet grooves and magnets to avoid gaps, the magnetic leakage phenomenon caused by the balance block is solved, and the use of low-cost magnetic permeable materials is achieved while avoiding magnetic leakage, reducing costs and improving the performance of the motor.
Patent Information
- Application Number
- CN202422077958.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-26
AI Technical Summary
In the prior art, the balance block covers the magnet of the motor rotor, resulting in magnetic leakage. In order to avoid magnetic leakage, expensive non-magnetic materials need to be used, which increases the cost.
By optimizing the structure and installation position of the balance block body, multiple magnet grooves and magnets are set up, and magnets are provided on the outer peripheral side of the balance block body to avoid the balance block covering the magnet, thereby avoiding magnetic leakage.
It effectively avoids magnetic leakage between the rotor core and the balance block body. At the same time, it can use low-cost magnetic permeability materials, reduce material costs, increase moment of inertia, and reduce motor vibration and noise.
Smart Images
Figure CN223024240U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of compressors, in particular to a rotor structure, an electric motor and a compressor. Background Art
[0002] The crankshaft of a rotary compressor is driven by a motor, and the refrigerant gas is compressed by driving a ring through an eccentric part. When the eccentric part rotates around the center of the crankshaft, a centrifugal force is generated, resulting in large vibration of the compressor. A balance weight is arranged on the axial end face of the motor rotor, and the centrifugal force generated by the balance weight balances the centrifugal force generated by the eccentric part of the pump body, reducing the vibration of the compressor.
[0003] However, in order to reduce the manufacturing cost of the balance weight, the balance weight is usually made of a material with magnetic conductivity characteristics. However, when the balance weight is abutted and arranged on the axial end face of the motor rotor, its axial projection covers the magnet on the motor rotor, resulting in magnetic leakage between the motor rotor and the balance weight. Therefore, in order to avoid magnetic leakage, the balance weight is changed to an expensive material with very low magnetic permeability or non-magnetic conductivity, such as stainless steel material, with high cost. Summary of the Utility Model
[0004] Based on this, the purpose of the utility model is to overcome the deficiencies of the prior art, and provide a rotor structure, an electric motor and a compressor. By optimizing and improving the structure and installation position of the balance weight body, while using a magnetic material with lower cost, the magnetic leakage phenomenon between the rotor core and the balance weight body can be effectively avoided. Compared with the existing magnetic material balance weight technology, the utility model does not need to add a magnetic isolation device or reduce magnetic leakage by increasing the thickness of the rotor end plate in a way that increases cost.
[0005] To achieve the above purpose, in the first aspect of the embodiment of the utility model, a rotor structure is provided, including a rotor core and a balance weight body. A plurality of magnet slots are arranged on the rotor core at intervals along the circumferential direction of the rotor core, and magnets are arranged in the magnet slots; the balance weight body is arranged on the axial end face of the rotor core, and the minimum distance G between the outer peripheral side of the balance weight body and the slot edge of the magnet slot close to the inner diameter side of the rotor core satisfies the condition: Wherein, the axial length of the rotor core is L, the width of the magnet slot is D, and the axial length of the magnet is H.
[0006] As an implementation manner, the balance weight body is arc-shaped, and the outer peripheral side of the balance weight body is an arc surface; or, a magnet avoidance notch is radially and inwardly recessed on the outer peripheral side of the balance weight body, and the magnet avoidance notch is V-shaped.
[0007] Thus, according to the rotor structure of the embodiment of the present utility model, by optimizing and improving the structure of the balance weight body, the outer peripheral side of the balance weight body is an arc surface, or a magnet avoidance notch is provided on the outer peripheral side of the balance weight body. In this way, when the balance weight body is assembled on the axial end face of the rotor core, the magnet avoidance notch can be distributed at intervals with the magnet slot on the rotor core, so as to avoid the magnetic leakage phenomenon between the rotor core and the balance weight body caused by the balance weight body covering the magnet. Therefore, the balance weight body of the embodiment of the present utility model can be made of a magnetic conductive material with a lower cost, which can not only reduce the material cost but also avoid the magnetic leakage phenomenon.
[0008] As an implementation manner, a valley peak protrudes radially outward in the middle of the outer peripheral side of the balance weight body, and the valley peak and both ends of the balance weight body respectively form magnet avoidance notches.
[0009] As an implementation manner, both ends of the inner peripheral side of the balance weight body and both ends of the outer peripheral side of the balance weight body are respectively connected by arc segments.
[0010] As an implementation manner, a rivet through hole is axially penetrated through the balance weight body.
[0011] As an implementation manner, the balance weight body includes a plurality of single pieces stacked, and the single piece is made of a magnetic conductive material.
[0012] As an implementation manner, the rotor core includes a plurality of rotor sheets stacked, and the rotor sheet is made of a magnetic conductive material.
[0013] As an implementation manner, a ring-shaped balance weight base is provided between the balance weight body and the rotor core, and the minimum distance K between the outer peripheral side of the balance weight base and the groove edge of the magnet slot close to the inner diameter side of the rotor core satisfies the condition: Wherein, the axial length of the rotor core is L, the width of the magnet slot is D, and the axial length of the magnet is H.
[0014] The second aspect of the embodiment of the present utility model provides a motor, including the rotor structure of any of the above embodiments. Thus, according to the motor of the embodiment of the present utility model, by optimizing and improving the structure and installation position of the balance weight body, while using a magnetic conductive material with a lower cost, the magnetic leakage phenomenon between the rotor core and the balance weight body can be effectively avoided.
[0015] The third aspect of the embodiment of the present utility model provides a compressor, including the motor of any of the above embodiments. Thus, according to the compressor of the embodiment of the present utility model, by optimizing and improving the structure and installation position of the balance weight body, while using a magnetic conductive material with a lower cost, the magnetic leakage phenomenon between the rotor core and the balance weight body can be effectively avoided.
[0016] For better understanding and implementation, the present utility model will be described in detail below with reference to the accompanying drawings. Description of the Drawings
[0017] Figure 1 It is a schematic structural view of the rotor structure of an embodiment of the present utility model;
[0018] Figure 2 It is a top view of the rotor structure of an embodiment of the present utility model;
[0019] Figure 3 is Figure 2 a schematic structural view of the rotor structure shown in FIG. without the end plate;
[0020] Figure 4 It is one of the schematic structural views of the balance weight body of an embodiment of the present utility model;
[0021] Figure 5 It is the second schematic structural view of the balance weight body of an embodiment of the present utility model;
[0022] Figure 6 It is a schematic structural view of the rotor structure of an embodiment of the present utility model provided with a balance weight base.
[0023] Description of the Reference Numerals:
[0024] 10. Balance weight body; 11. Magnet avoidance notch; 12. Valley peak; 13. Rivet through hole; 14. Balance weight base; 20. Rotor core; 21. Magnet slot. Detailed Embodiment
[0025] To further illustrate each embodiment, the present utility model provides accompanying drawings. These drawings are a part of the disclosure of the present utility model, mainly used to illustrate the embodiments, and can be used to explain the operating principle of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these contents, those of ordinary skill in the art should be able to understand other possible embodiments and the advantages of the present utility model.
[0026] In the related art, in order to reduce the manufacturing cost of the balance weight, the balance weight is usually made of a material with magnetic conductivity characteristics. However, when the balance weight is abutted and arranged on the axial end face of the motor rotor, its axial projection covers the magnet on the motor rotor, resulting in magnetic leakage between the motor rotor and the balance weight. Therefore, in order to avoid magnetic leakage, the balance weight is changed to an expensive material with very low magnetic conductivity or non-magnetic conductivity, such as stainless steel material, with high cost.
[0027] In view of this, the embodiments of the present utility model provide a rotor structure, a motor and a compressor. According to the rotor structure, the motor and the compressor of the embodiments of the present utility model, through the optimization and improvement of the structure and installation position of the balance weight body, while using a magnetic conductive material with a relatively low cost, the magnetic leakage phenomenon between the rotor core and the balance weight body can be effectively avoided. Compared with the existing magnetic material balance weight technology, the present utility model does not need to add a magnetic isolation device or reduce the magnetic leakage by increasing the thickness of the rotor end plate in a way that increases the cost.
[0028] Please refer to Figures 1 to 5 ; The first aspect of the embodiments of the present utility model provides a rotor structure, including a rotor core 20 and a balance weight body 10. A plurality of magnet slots 21 are arranged on the rotor core 20 at intervals in the circumferential direction of the rotor core 20, and magnets are arranged in the magnet slots 21; the balance weight body 10 is arranged on the axial end face of the rotor core 20, and the minimum distance G between the outer peripheral side of the balance weight body 10 and the slot edge of the magnet slot 21 close to the inner diameter side of the rotor core 20 satisfies the condition: Wherein, the axial length of the rotor core 20 is L, the width of the magnet slot 21 is D, and the axial length of the magnet is H.
[0029] In some embodiments of the present utility model, the outer peripheral side of the balance weight body 10 is an arc surface, or the middle part of the outer peripheral side of the balance weight body 10 protrudes radially outward to form a valley peak 12, and magnetic stone avoidance notches 11 are respectively formed at both ends of the valley peak 12 and the balance weight body 10. Among them, the valley peak 12 has an inverted V-shaped structure.
[0030] Thus, according to the rotor structure of the embodiments of the present utility model, through the optimization and improvement of the structure of the balance weight body 10, the outer peripheral side of the balance weight body 10 is an arc surface, or magnetic stone avoidance notches 11 are arranged on the outer peripheral side of the balance weight body 10. In this way, when the balance weight body 10 is assembled on the axial end face of the rotor core 20, the magnetic stone avoidance notches 11 can be distributed at intervals with the magnet slots 21 on the rotor core 20 to avoid the balance weight body 10 covering the magnets and causing the magnetic leakage phenomenon between the rotor core 20 and the balance weight body 10. Therefore, the balance weight body 10 of the embodiments of the present utility model can be made of a magnetic conductive material with a relatively low cost, which can not only reduce the material cost but also avoid the magnetic leakage phenomenon.
[0031] In some embodiments of the present utility model, the balance weight body 10 is axially penetrated with a rivet through hole 13. Additionally, the balance weight body 10 includes a plurality of single sheets stacked together, and the single sheets are made of a magnetic conductive material; the rotor core 20 includes a plurality of rotor sheets stacked together, and the rotor sheets are made of a magnetic conductive material. In other words, in these embodiments of the present utility model, the waste materials generated from the magnetic conductive material used to manufacture the rotor core 20 can also be used as the manufacturing material for the balance weight body 10, thereby greatly improving the material utilization rate and further reducing the manufacturing cost of the motor.
[0032] In some embodiments of the present utility model, the two ends of the inner peripheral side of the balance weight body 10 are respectively connected to the two ends of the outer peripheral side of the balance weight body 10 through arc segments.
[0033] As Figure 6 shown, in some embodiments of the present utility model, a ring-shaped balance weight base 14 is provided between the balance weight body 10 and the rotor core 20, and the minimum distance K between the outer peripheral side of the balance weight base 14 and the groove edge of the magnet groove 21 close to the inner diameter side of the rotor core 20 satisfies the condition: wherein, the axial length of the rotor core 20 is L, the width of the magnet groove 21 is D, and the axial length of the magnet is H. That is to say, in these embodiments, by adding a ring-shaped balance weight base 14 between the balance weight body 10 and the rotor core 20, the moment of inertia of the rotor structure can be effectively increased, which plays a good role in improving the vibration, noise, etc. of the motor. Among them, the balance weight base 14 includes a plurality of single sheets stacked together, and the single sheets are made of a magnetic conductive material; in other words, in these embodiments of the present utility model, the waste materials generated from the magnetic conductive material used to manufacture the rotor core 20 can also be used as the manufacturing material for the balance weight base 14, thereby greatly improving the material utilization rate and further reducing the manufacturing cost of the motor.
[0034] Next, refer to Figures 1 to 5 to describe in detail the rotor structure according to a specific embodiment of the present utility model. It should be understood that the following description is only an exemplary illustration and cannot be construed as a limitation to the present utility model.
[0035] The rotor structure of this embodiment includes a rotor core 20 and a balance weight body 10. The rotor core 20 is provided with a plurality of magnet slots 21 spaced along the circumferential direction of the rotor core 20; the balance weight body 10 is arc-shaped, the inner circumferential side of the balance weight body 10 is an arc surface, and a magnet avoidance notch 11 is radially recessed inwardly on the outer circumferential side of the balance weight body 10. The magnet avoidance notch 11 is in a V-shaped structure; the balance weight body 10 is arranged on the axial end face of the rotor core 20. The distance from the outer circumferential side of the magnet avoidance notch 11 to the groove edge of the magnet slot 21 close to the inner diameter side of the rotor is preferably 0.28 mm, which can not only ensure no magnetic leakage, but also maximize the distance from the center of gravity of the balance weight body 10 to the center of the rotor, thereby increasing the rotation radius, increasing the moment of inertia, and achieving a good balance effect. Of course, the distance from the outer circumferential side of the magnet avoidance notch 11 to the groove edge of the magnet slot 21 close to the inner diameter side of the rotor can also be selected as dimensions such as 0.3 mm, 0.6 mm, 1 mm, etc. according to the design margin.
[0036] Among them, the middle part of the outer circumferential side of the balance weight body 10 of this embodiment protrudes radially outward to form a valley peak 12. The valley peak 12 and the two ends of the balance weight body 10 respectively form the magnet avoidance notch 11; among them, the valley peak 12 is in an inverted V-shaped structure. In this embodiment, the balance weight body 10 includes a plurality of single sheets stacked, and the single sheet is made of a magnetic conductive material; in addition, the rotor core 20 includes a plurality of rotor sheets stacked, and the rotor sheet is made of a magnetic conductive material. In this embodiment, the two ends of the inner circumferential side of the balance weight body 10 and the two ends of the outer circumferential side of the balance weight body 10 are respectively connected by arc segments.
[0037] Next, refer to Figures 1 to 6 to describe in detail the rotor structure according to a specific embodiment of the present invention. It should be understood that the following description is only an exemplary illustration and cannot be construed as a limitation of the present invention.
[0038] The rotor structure of this embodiment includes a rotor core 20 and a balance weight body 10. A plurality of magnet slots 21 are provided on the rotor core 20 at intervals in the circumferential direction of the rotor core 20; the balance weight body 10 is arc-shaped, the inner circumferential side of the balance weight body 10 is an arc surface, and a magnet avoidance notch 11 is radially inwardly recessed on the outer circumferential side of the balance weight body 10, and the magnet avoidance notch 11 is in a V-shaped structure; the balance weight body 10 is arranged on the axial end surface of the rotor core 20, and an annular balance weight base 14 is arranged between the balance weight body 10 and the rotor core 20. The balance weight base 14 includes a plurality of single sheets stacked, and the single sheet is made of a magnetic conductive material; in other words, in these embodiments of the present invention, the waste materials generated by the magnetic conductive material used to manufacture the rotor core 20 can also be used as the manufacturing material of the balance weight base 14, thereby greatly improving the material utilization rate and further reducing the manufacturing cost of the motor. The balance weight base 14 is an integral structure in the circumferential direction and is simple to manufacture. The distance between the outer circumferential side of the balance weight base 14 and the groove edge of the magnet slot 21 close to the inner diameter side of the rotor is preferably 0.28 mm, which can not only ensure no magnetic leakage, but also maximize the distance from the center of gravity of the balance weight base 14 to the center of the rotor, thereby increasing the moment of inertia of the whole rotor and having a good improvement effect on the vibration and noise of the motor. Of course, the distance between the outer circumferential side of the balance weight base 14 and the groove edge of the magnet slot 21 close to the inner diameter side of the rotor can also be selected as dimensions such as 0.3 mm, 0.6 mm, 1 mm, etc. according to the design margin.
[0039] Wherein, the middle part of the outer circumferential side of the balance weight body 10 of this embodiment protrudes radially outward to form a valley peak 12, and the valley peak 12 and the two ends of the balance weight body 10 respectively form a magnet avoidance notch 11; wherein, the valley peak 12 is in an inverted V-shaped structure. In this embodiment, the balance weight body 10 includes a plurality of single sheets stacked, and the single sheet is made of a magnetic conductive material; in addition, the rotor core 20 includes a plurality of rotor sheets stacked, and the rotor sheet is made of a magnetic conductive material. In this embodiment, the two ends of the inner circumferential side of the balance weight body 10 and the two ends of the outer circumferential side of the balance weight body 10 are respectively connected by arc segments.
[0040] The second aspect of the embodiment of the present invention provides a motor, including the rotor structure of any of the above embodiments. Thus, according to the motor of the embodiment of the present invention, through the optimization and improvement of the structure and installation position of the balance weight body 10, while using a magnetic conductive material with a lower cost, the magnetic leakage phenomenon between the rotor core 20 and the balance weight body 10 can be effectively avoided.
[0041] The third aspect of the embodiment of the present utility model provides a compressor, including the motor of any one of the above embodiments. Thus, for the compressor according to the embodiment of the present utility model, through the optimization and improvement of the structure and installation position of the balance weight body 10, while using a magnetic conductive material with relatively low cost, the magnetic leakage phenomenon between the rotor core 20 and the balance weight body 10 can be effectively avoided.
[0042] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.
[0043] The above-described embodiments only represent several implementation manners of the present utility model, and the description thereof is relatively specific and detailed, but should not be construed as a limitation to the scope of the rotor structure, motor and compressor of the utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model.
Claims
1. A rotor structure, characterized in that: The invention comprises a rotor core and a balancing block body, wherein the rotor core is provided with a plurality of magnet grooves spaced along the circumferential direction of the rotor core, and magnets are arranged in the magnet grooves; the balancing block body is arranged on the axial end surface of the rotor core, and the minimum distance G between the outer circumference side of the balancing block body and the groove edge of the magnet groove close to the inner diameter side of the rotor core satisfies the condition: The axial length of the rotor core is L, the width of the magnet slot is D, and the axial length of the magnet is H.
2. The rotor structure according to claim 1, characterized in that: The balancing weight body is arc-shaped, and the outer peripheral side of the balancing weight body is an arc surface; or, the outer peripheral side of the balancing weight body is radially inwardly recessed to provide a magnet avoidance gap, and the magnet avoidance gap is V-shaped.
3. The rotor structure according to claim 1, characterized in that: The middle part of the outer peripheral side of the balancing weight body protrudes radially outward to form a valley peak, and the valley peak and two ends of the balancing weight body respectively form magnet avoidance gaps.
4. The rotor structure according to claim 1, characterized in that: The two ends of the inner circumference of the balancing weight body are connected with the two ends of the outer circumference of the balancing weight body through arc segments respectively.
5. The rotor structure according to claim 1, characterized in that: The balancing weight body is provided with a rivet through hole along the axial direction.
6. The rotor structure according to claim 1, characterized in that: The balancing weight body includes a plurality of stacked single sheets, and the single sheets are made of magnetic conductive material.
7. The rotor structure according to claim 1, characterized in that: The rotor core includes a plurality of rotor sheets stacked together, and the rotor sheets are made of magnetic conductive material.
8. The rotor structure according to claim 1, characterized in that: An annular balancing block base is provided between the balancing block body and the rotor core, and the minimum distance K between the outer peripheral side of the balancing block base and the slot edge of the magnet slot close to the inner diameter side of the rotor core satisfies the condition: The axial length of the rotor core is L, the width of the magnet slot is D, and the axial length of the magnet is H.
9. A motor, characterized in that: Comprising a rotor structure as claimed in any one of claims 1 to 8.
10. A compressor, characterized in that: Comprising the motor as claimed in claim 9.