Rotor end ring of oil-cooled switched reluctance motor
By integrating a heat dissipation module and cooling oil circuit into the rotor end ring of the switched reluctance motor, the problems of low material utilization and low heat dissipation efficiency are solved, achieving rotor dynamic balancing and efficient cooling, thus improving the reliability of the motor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-31
- Publication Date
- 2026-04-10
AI Technical Summary
The rotor end rings of existing switched reluctance motors have low material utilization and occupy rotor axial space during dynamic balancing, which affects heat dissipation.
Design a rotor end ring for an oil-cooled switched reluctance motor. Combine the ring body and heat dissipation module to form a heat dissipation path. Utilize multiple sets of cooling rings and guide plates to form a cooling oil circuit, achieving the integration of dynamic balance and efficient heat dissipation.
While achieving rotor dynamic balancing, it also improved the cooling efficiency of the rotor core and stator windings, simplified the motor structure, and improved the reliability of the aviation oil-cooled switched reluctance motor.
Smart Images
Figure CN121840982A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of aviation oil-cooled motors, and particularly relates to a rotor end ring of an oil-cooled switched reluctance motor. BACKGROUND
[0002] There is only a rotor core on the rotor of a switched reluctance motor, and there is no winding. In order to make the dynamic balance of the rotor meet the use requirements when the rotor is running, a rotor end ring is generally installed at both ends of the rotor core. The rotor end ring is usually made of metal material and has a certain thickness. A balance weight hole is left at the position close to the outer circle of the end ring or the weight is removed to balance the rotor, and the rotor end ring has no other functions.
[0003] For example, Figure 1 The existing switched reluctance rotor end ring generally balances the rotor by removing weight or increasing weight, and has no other functions. The rotor end ring has the following disadvantages:
[0004] 1) The rotor end ring is only used for balancing the rotor, and the weight of the rotor is increased, and the material utilization rate is not high;
[0005] 2) The rotor end ring occupies the axial space of the rotor, so that the cooling medium cannot directly contact the rotor core, and heat dissipation is affected;
[0006] Therefore, a rotor end ring that can balance the rotor and efficiently cool the rotor core is needed to improve the material utilization rate in a unit space and the reliability of the product. SUMMARY
[0007] In order to solve the above problems, the application provides a rotor end ring of an oil-cooled switched reluctance motor to solve the problem of low material utilization rate of the existing rotor end ring in balancing the rotor in the prior art.
[0008] The technical scheme of the application is: a rotor end ring of an oil-cooled switched reluctance motor, comprising a ring body and a heat dissipation module, the heat dissipation module and the ring body combine to form a heat dissipation channel; a balance adjusting area is arranged at the outer circle of the ring body.
[0009] The heat dissipation module comprises a cooling ring and a flow guide plate; the cooling ring is arranged in the interior of the ring body, and an oil inlet is arranged on the inner side of the cooling ring; a plurality of groups of cooling rings are arranged, and a cooling oil path is formed between the plurality of groups of cooling rings; the flow guide plate and the ring body form an oil outlet; and the oil inlet, the cooling oil path and the oil outlet are in communication.
[0010] Preferably, the cooling ring comprises a first cooling ring, a second cooling ring and a third cooling ring, the first cooling ring, the second cooling ring and the third cooling ring are coaxially arranged, the first cooling ring is arranged at the innermost side, and the third cooling ring is arranged at the outermost side.
[0011] Preferably, the first cooling ring is shared by two groups and arranged in a ring shape, with a gap between adjacent first cooling rings, and the first cooling ring is interference fitted with the rotation shaft of the rotor.
[0012] Preferably, the second cooling ring is shared by three groups and arranged in a ring shape, with a gap between adjacent second cooling rings, and the gap between the second cooling ring and the first cooling ring is arranged in an interlaced manner.
[0013] Preferably, the third cooling ring is shared by eight groups and arranged in a ring shape, with a gap between adjacent third cooling rings, and the third cooling ring and the second cooling ring are arranged at different positions.
[0014] Preferably, the oil outlet is shared by multiple groups and arranged uniformly in a circumferential direction around the ring body, and two flow guides are arranged in each oil outlet; the oil outlet is arranged opposite to the end portion of the stator winding of the motor.
[0015] The rotor end ring of the oil-cooled switched reluctance motor has the following advantages:
[0016] The rotor end ring can meet the demand of dynamic balance of the rotor, and can cool the rotor core and the end portion winding of the stator, and is simple and reliable, and is particularly suitable for an aviation oil-cooled switched reluctance motor, and improves the reliability of the motor. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is a schematic diagram of the rotor end ring structure in the background art;
[0018] Figure 2 It is a schematic diagram of the overall structure of the present application;
[0019] Figure 3 It is a schematic diagram of the balance correction end face of the present application;
[0020] Figure 4 It is a structure diagram of the rotor end ring installation position and the stator and rotor of the present application.
[0021] 1, ring body; 2, first cooling ring; 3, second cooling ring; 4, third cooling ring; 5, flow guide; 6, oil inlet; 7, oil outlet. DETAILED DESCRIPTION
[0022] For the purpose, technical solutions and advantages of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described in more detail below in combination with the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, not all embodiments. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below in combination with the drawings.
[0023] The first aspect of the present application provides a rotor end ring of an oil-cooled switched reluctance motor, which is connected with a switched reluctance motor rotor core.
[0024] As Figures 2-4 , including ring body 1 and heat dissipation module, the heat dissipation module and the ring body 1 combine to form a heat dissipation passage; The outer circle of the ring body 1 is provided with a balance adjusting area; The ring body 1 and the heat dissipation module are made of metal materials with good non-magnetic and heat conduction properties, such as copper and aluminum.
[0025] The heat dissipation module includes a cooling ring and a flow guide plate 5; The cooling ring is arranged inside the ring body 1, and the inner side of the cooling ring is provided with an oil inlet 6; The cooling ring has multiple groups, and the multiple groups of cooling rings form a cooling oil path; The flow guide plate 5 and the ring body 1 form an oil outlet 7, and the oil inlet 6, the cooling oil path and the oil outlet 7 are in communication.
[0026] The cooling oil of the rotating shaft enters the oil inlet 6 of the cold end ring, and is thrown out from the oil outlet 7 after passing through the cooling oil path. The oil outlet 7 of the oil is opposite to the end of the stator winding, and the oil thrown out in the rotating state can cool the stator winding.
[0027] For the first time, dynamic balance correction and high-efficiency cooling are integrated in the same end ring, breaking the limitation of traditional end ring function single, reducing the number of additional parts, simplifying the structure of the motor. The heat dissipation module and the ring body 1 are designed to form a heat dissipation passage, so that the cooling medium (oil) can directly flow through the rotor core, avoiding the problem of hindering heat dissipation of the traditional end ring, and improving the rotor cooling efficiency.
[0028] Preferably, the cooling ring includes a first cooling ring 2, a second cooling ring 3 and a third cooling ring 4, the first cooling ring 2, the second cooling ring 3 and the third cooling ring 4 are coaxially arranged, and the first cooling ring 2 is arranged at the innermost side, and the third cooling ring 4 is arranged at the outermost side.
[0029] Through the coaxial multi-layer cooling ring design, the lubricating oil flows through the cooling rings at different radial positions layer by layer from the inside to the outside, forming a gradient heat dissipation path covering different radial areas of the rotor core, and improving the overall temperature uniformity of the rotor.
[0030] Preferably, the first cooling ring 2 has two groups and is arranged in a ring shape, and has a spacing between adjacent first cooling rings 2, and the first cooling ring 2 is in interference fit with the rotating shaft of the rotor. The first cooling ring 2 is close to the rotating shaft and is in close contact with the rotating shaft through the interference fit, so that the heat transmitted by the rotating shaft can be directly absorbed when the lubricating oil flows, avoiding the risk of mechanical failure caused by local overheating of the rotating shaft.
[0031] Preferably, the second cooling ring 3 has three groups and is arranged in a ring shape, and has a spacing between adjacent second cooling rings 3, and the spacing between the second cooling ring 3 and the first cooling ring 2 is arranged in an interlaced manner. The spacing between the second cooling ring 3 and the first cooling ring 2 is interlaced, so that the lubricating oil forms an "S" type or cross-flow path when flowing, prolongs the residence time of the lubricating oil in the cooling ring, increases the contact area with the ring body 1 and the rotor core, and improves the heat exchange efficiency.
[0032] Preferably, the third cooling ring 4 has eight groups and is arranged in a ring shape, and has a spacing between adjacent third cooling rings 4, and the spacing positions of the third cooling ring 4 and the second cooling ring 3 are different. The third cooling ring 4 is close to the outer circle of the rotor, and the eight ring-shaped designs expand the cooling coverage, ensuring that the heat of the outer circle of the rotor is fully removed, maintaining the stability of the air gap magnetic field and improving the output efficiency of the motor.
[0033] Preferably, the oil outlet 7 has multiple groups and is arranged circumferentially and uniformly around the ring body 1, and each oil outlet 7 is provided with two flow guides 5; the oil outlet 7 is arranged opposite the end portion of the stator winding of the motor, and the cooling oil path can be set to different sizes according to the space and the required flow resistance.
[0034] The oil outlet is opposite the end portion of the stator winding, and the centrifugal force generated by the high-speed rotation of the rotor is used to throw the lubricating oil to the end portion of the stator winding, directly flushing the surface of the winding, quickly removing the heat generated by the copper loss of the winding, significantly reducing the winding temperature rise, and avoiding insulation failure.
[0035] In summary, the present application has the following advantages:
[0036] It can not only meet the demand of rotor dynamic balance, but also cool the rotor core and the end portion of the stator winding, and is simple and reliable, especially suitable for aviation oil-cooled switched reluctance motors, and improves the reliability of the motor.
[0037] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A rotor end ring for an oil-cooled switched reluctance motor, characterized by, The application relates to a cooling device for a motor rotor, which comprises a ring body (1) and a cooling module, wherein the cooling module and the ring body (1) form a cooling passage; a balance adjusting area is arranged at the outer circle of the ring body (1); The cooling module comprises cooling rings and flow guide plates (5); the cooling rings are arranged in the ring body (1), and the inner side of the cooling rings is provided with an oil inlet (6); the cooling rings are grouped, and cooling oil channels are formed between the groups of the cooling rings; the flow guide plates (5) and the ring body (1) form an oil outlet (7); the oil inlet (6), the cooling oil channels and the oil outlet (7) are communicated with each other.
2. The rotor end ring of an oil-cooled switched reluctance motor as claimed in claim 1, wherein, The cooling rings comprise first cooling rings (2), second cooling rings (3) and third cooling rings (4), the first cooling rings (2), the second cooling rings (3) and the third cooling rings (4) are coaxially arranged, the first cooling rings (2) are arranged at the innermost side, and the third cooling rings (4) are arranged at the outermost side.
3. The rotor end ring of an oil-cooled switched reluctance motor as claimed in claim 2, wherein, The first cooling rings (2) are arranged in two groups in a ring shape, and have intervals between adjacent first cooling rings (2); the first cooling rings (2) are in interference fit with the rotating shaft of the rotor.
4. The rotor end ring of an oil-cooled switched reluctance motor as claimed in claim 3, wherein, The second cooling rings (3) are arranged in three groups in a ring shape, and have intervals between adjacent second cooling rings (3); the intervals between the second cooling rings (3) and the first cooling rings (2) are arranged in an interlaced mode.
5. The rotor end ring of an oil-cooled switched reluctance motor as claimed in claim 4, wherein, The third cooling rings (4) are arranged in eight groups in a ring shape, and have intervals between adjacent third cooling rings (4); the intervals between the third cooling rings (4) and the second cooling rings (3) are different.
6. The rotor end ring of an oil-cooled switched reluctance motor as claimed in claim 1, wherein, The oil outlets (7) are arranged in multiple groups and in a circumferential uniform mode around the ring body (1); two flow guide plates (5) are arranged in each oil outlet (7); and the oil outlets (7) are arranged opposite to the end part of the motor stator winding.