A winding end cooling structure

Abstract

The invention discloses a winding end cooling structure, comprising: a cooling circuit integrated with the winding potting, and the inlet and outlet of the cooling circuit are exposed outside the potting body; the cooling circuit comprises: a first circuit wrapped around the shaft extension end winding, and a second circuit wrapped around the lead-out wire end winding; the first circuit formed by continuous flow channel winding comprises: a first outer ring portion formed by surrounding along the outer rotation surface of the shaft extension end winding, a first top ring portion formed by surrounding along the end surface of the shaft extension end winding, and a first inner ring portion formed by surrounding along the inner rotation surface of the shaft extension end winding; the second circuit formed by continuous flow channel winding comprises: a second outer ring portion formed by surrounding along the outer rotation surface of the lead-out wire end winding, and a second top ring portion formed by surrounding along the end surface of the lead-out wire end winding. The cooling circuit is directly laid outside the winding end, so as to achieve the purpose of directly cooling the winding end, and the cooling effect is good.

Description

Technical Field

[0001] The invention relates to the technical field of motor cooling, and in particular to a winding end cooling structure. Background Art

[0002] At present, there are two main cooling methods for automotive motors: direct cooling and indirect cooling. Direct cooling uses direct contact between the medium and the copper wire to take away the heat dissipated by the copper wire. The current direct cooling technology is costly and difficult. Indirect cooling uses indirect contact between the cooling medium and the casing or stator and rotor to cool the motor. Among indirect cooling, air cooling has low heat dissipation cost, is simple and reliable, but has insufficient heat dissipation capacity for high-power motors and extreme working conditions of automobiles. Oil cooling has better insulation performance and high cooling effect, but the cooling oil loss increases and the motor operation risk factor is high. Water cooling has the best cooling effect, but cooling water channels need to be laid in the casing, and the structure is more complicated. Summary of the invention

[0003] The present invention provides a winding end cooling structure, which solves the problems of poor heat dissipation effect of the motor and inconvenient processing of the cooling structure.

[0004] The technical solution of the present invention is: a winding end cooling structure, including: a shaft extension end winding end cooling module and a lead wire end winding end cooling module. Each cooling module is composed of a winding and a cooling circuit corresponding to the end. The electromagnetic wire components in the winding are arranged in an orderly and regular manner according to the motor design requirements, and the cooling circuit is wrapped around the winding at the corresponding end to form a circulating cooling. When the motor is packaged inside, the winding and the corresponding cooling circuit are packaged as a whole using a filling technology, and the inlet and outlet of the cooling circuit, the wiring terminals of the winding, and the lead wire terminals are exposed outside the package.

[0005] Preferably, the shaft extension end winding, the lead wire end winding and the electromagnetic wire in the iron core are connected correspondingly to form a coil power circuit.

[0006] Specifically, the shaft extension end winding end cooling module includes: the shaft extension end winding and a first loop.

[0007] The first loop formed by winding a continuous flow channel includes: a first outer ring portion formed along the outer rotating surface of the axial end winding, a first top ring portion formed along the end surface of the axial end winding, and a first inner ring portion formed along the inner rotating surface of the axial end winding.

[0008] The first outer ring portion, the first top ring portion, and the first inner ring portion are sequentially connected to form a one-way circulation circuit, and the first outer ring portion, the first top ring portion, and the first inner ring portion are all arranged in a single flow channel.

[0009] Preferably, the end of the first outer ring portion is folded up to transition to the end surface of the shaft extension end winding to form a first top ring portion; the end of the first top ring portion is folded up to transition to the inner rotating surface of the shaft extension end winding to form a first inner ring portion; the end of the first inner ring portion is folded up to transition to the outer rotating surface of the shaft extension end winding to arrange the first circuit inlet.

[0010] Preferably, the first circuit outlet is arranged at the starting end of the first outer ring portion; the first circuit outlet is adjacent to the first circuit inlet, and the difference between the two is 10° to 20° in the rotation circumferential direction.

[0011] The lead-out terminal winding end cooling module comprises: a lead-out terminal winding and a second loop.

[0012] The second loop formed by the continuous flow channel includes: a second outer ring portion formed around the outer rotating surface of the lead-out terminal winding, and a second top ring portion formed around the end surface of the lead-out terminal winding.

[0013] The second outer ring portion and the second top ring portion are connected to form a one-way flow circuit.

[0014] Preferably, the end of the second outer circle portion is folded up to transition to the end surface of the lead-out wire end winding to form a second top circle portion; the second top circle portion forms a concentrically coiled double flow channel arrangement on the end surface of the lead-out wire end winding; the end of the second top circle portion transitions to the outer turning surface of the lead-out wire end winding to arrange the second circuit inlet.

[0015] Preferably, the second circuit outlet is arranged at the starting end of the second outer ring portion; the second circuit outlet is adjacent to the second circuit inlet, and the difference between the two is 10° to 20° in the rotation circumferential direction.

[0016] The advantages of the present invention are:

[0017] 1. The cooling circuit is laid directly outside the winding end to achieve the purpose of directly cooling the winding end, and the cooling effect is good.

[0018] 2. The cooling circuit has a modular structure. Unlike the groove design in the casing, it can be independently processed according to size requirements and then assembled with the winding end. Therefore, the cooling circuit has good airtightness and is easy to process.

[0019] 3. After the winding end is potted, the motor has good insulation, and the winding end module can be in direct contact with the casing, further improving the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0021] Figure 1 It is a schematic diagram of the cooling module of the winding end at the shaft extension end;

[0022] Figure 2 It is a schematic diagram of a cooling module for the lead-out terminal winding end;

[0023] Figure 3 It is a schematic diagram of the first loop wrapped around the shaft extension end winding;

[0024] Figure 4 is a schematic diagram of the first circuit;

[0025] Figure 5 It is a schematic diagram of the second loop wrapped around the lead-out terminal winding;

[0026] Figure 6 is a schematic diagram of the second circuit;

[0027] Among them, 1. cooling module for the winding end at the shaft extension end; 2. first potting component; 3. first circuit; 31. first circuit inlet; 32. first circuit outlet; 33. first outer ring; 34. first top ring; 35. first inner ring; 4. shaft extension end winding; 5. cooling module for the winding end at the lead wire end; 6. second circuit; 61. second circuit inlet; 62. second circuit outlet; 63. second outer ring; 64. second top ring; 7. lead wire end winding; 8. three-phase lead wire; 9. second potting component. DETAILED DESCRIPTION

[0028] Embodiment 1:

[0029] The shaft extension end winding cooling module 1 comprises: a shaft extension end winding 4 and a first loop 3 .

[0030] The first loop 3 formed by winding a continuous flow channel includes a first outer ring portion 33 , a first top ring portion 34 , and a first inner ring portion 35 .

[0031] The first outer ring portion 33 is arranged in a ring shape along the outer rotating surface of the shaft extension end winding 4.

[0032] The first top ring portion 34 is arranged in a ring shape along the end surface of the axial extension end winding 4 .

[0033] The first inner ring portion 35 is arranged in a ring shape along the inner rotating surface of the shaft extension end winding 4.

[0034] The first outer ring portion 33 , the first top ring portion 34 , and the first inner ring portion 35 are sequentially connected to form a one-way circulation circuit, and the first outer ring portion 33 , the first top ring portion 34 , and the first inner ring portion 35 are all arranged in a single flow channel.

[0035] like Figure 4As shown, the end of the first outer ring portion 33 is folded upward to transition to the end surface of the shaft extension end winding 4 to form a first top ring portion 34; the end of the first top ring portion 34 is folded downward to transition to the inner rotating surface of the shaft extension end winding 4 to form a first inner ring portion 35; the end of the first inner ring portion 35 is folded upward to transition to the outer rotating surface of the shaft extension end winding 4 to arrange the first circuit inlet 31.

[0036] The first circuit outlet 32 ​​is arranged at the beginning of the first outer ring portion. The first circuit outlet 32 ​​is adjacent to the first circuit inlet 31 , and the difference between the two is 10° to 20° in the circumferential direction of rotation.

[0037] The lead-out terminal winding end cooling module 5 comprises: a lead-out terminal winding 7 and a second loop 6 .

[0038] The second loop 6 formed by winding a continuous flow channel includes a second outer ring portion 63 and a second top ring portion 64 .

[0039] The second outer ring portion 63 is arranged in a ring shape along the outer rotating surface of the lead-out terminal winding 7 .

[0040] The second top ring portion 64 is arranged in a ring shape along the end surface of the lead-out terminal winding 7 .

[0041] The second outer ring portion 63 and the second top ring portion 64 are connected to form a one-way circulation circuit.

[0042] like Figure 6 As shown, the end of the second outer circle portion 63 is folded up to transition to the end surface of the lead-out wire terminal winding 7 to form a second top circle portion 64; the second top circle portion 64 forms a concentrically coiled double flow channel arrangement on the end surface of the lead-out wire terminal winding 7; the end of the second top circle portion 64 transitions to the outer rotating surface of the lead-out wire terminal winding 7 to arrange the second circuit inlet 61.

[0043] The second circuit outlet 62 is arranged at the beginning of the second outer ring portion 63 ; the second circuit outlet 62 is adjacent to the second circuit inlet 61 , and the difference between the two in the rotation circumferential direction is 10° to 20°.

[0044] Embodiment 2:

[0045] The motor of this scheme adopts a winding end cooling structure, places the cooling circuit at the end of the winding, and uses potting technology to fix the end winding and the cooling water circuit into one.

[0046] In the cooling module 1 for the end of the shaft extension winding, the electromagnetic wire elements are arranged regularly in sequence according to the motor design requirements to form the shaft extension winding 4, and the first loop 3 is annularly wrapped around the inner rotating side and the outer rotating side of the shaft extension winding 4. The spliced ​​and assembled shaft extension winding 4 and the first loop 3 are potted to form a first potting component 2, leaving the first loop inlet 31 and the first loop outlet 32 ​​of the first loop 3 outside the first potting component 2.

[0047] In the lead-out wire end winding end cooling module 5, the electromagnetic wire elements are arranged regularly in sequence according to the motor design requirements and correspond to the electromagnetic wire at the shaft extension end to form a lead-out wire end winding 7. The second loop 6 is annularly wrapped around the outside of the lead-out wire end winding 7. The spliced ​​and assembled lead-out wire end winding 7 and the second loop 6 are potted to form a second potting component 9, leaving the second loop inlet 61, the second loop outlet 62, and the three-phase lead-out wire 8 of the second loop 6 outside the second potting component 9.

[0048] The potted axial extension end winding end module 1 and the lead-out line end winding end module 5 are connected to the electromagnetic wire in the iron core to form a coil power circuit.

[0049] The electromagnetic wire element 4 can be a conductive electromagnetic element such as copper wire, aluminum wire, silver wire, etc.;

[0050] The electromagnetic wire element 4 can be a flat wire or a round wire;

[0051] The first potting component 2 and the second potting component 9 need to cover and wrap the winding end and the cooling circuit;

[0052] After potting, apply anti-condensation silicone coating on the outside of the potting parts;

[0053] During the operation of the motor, the temperature of the winding end is usually the highest due to the low air heat dissipation coefficient. Therefore, this solution is based on a modular winding end structure and achieves the purpose of directly cooling the winding end by setting a cooling circuit outside the winding end.

[0054] Embodiment 3:

[0055] In this solution example, the winding wire of the motor with 48 slots and 8 poles is used. The cooling module 1 of the shaft end winding is composed of the first loop 3 and the shaft end winding 4. The cooling loop is independently processed based on the size of the end winding and is annularly sleeved on the shaft end winding 4. The first loop 3 is composed of three annular water channels, which cover the inside, outside and upper side of the shaft end winding 4. After the first loop 3 and the shaft end winding 4 are assembled, they are potted with epoxy material, and the potting material is wrapped on the shaft end winding 4 and the first loop 3.

[0056] In the lead-out terminal winding end cooling module 5, the second loop 6 is composed of three annular water channels. After being spliced ​​with the lead-out terminal winding 7, the second loop 6 wraps the outer side and upper side of the lead-out terminal winding 7, and then performs potting treatment. After potting, an anti-condensation silicone coating is applied to the outer side of the potting component.

[0057] When the motor is running, coolant (cooling water, coolant, liquid cooling gas, etc.) is introduced into the inlet. The coolant passes through the annular water channel, takes away the heat from the winding end, and flows out from the outlet.

[0058] In addition, the epoxy material is in direct contact with the casing, and its thermal conductivity is higher than that of air. The end of the end winding directly conducts heat to the casing through the epoxy material, thereby improving the heat dissipation capacity of the motor.

[0059] The embodiments of the present invention are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A winding end cooling structure, comprising: A cooling circuit integrated with the winding potting, and the inlet and outlet of the cooling circuit are exposed outside the potting body; characterized in that: the cooling circuit comprises: a first circuit wrapped around the shaft extension end winding, and a second circuit wrapped around the lead-out end winding; The first loop formed by winding a continuous flow channel includes: a first outer ring portion formed along the outer rotating surface of the shaft extension end winding, a first top ring portion formed along the end surface of the shaft extension end winding, and a first inner ring portion formed along the inner rotating surface of the shaft extension end winding; the first outer ring portion, the first top ring portion, and the first inner ring portion are sequentially connected to form a one-way flow loop; the end of the first inner ring portion is folded to transition to the outer rotating surface of the shaft extension end winding to arrange the first loop inlet; the first loop outlet is arranged at the beginning of the first outer ring portion; The second loop formed by winding a continuous flow channel includes: a second outer ring portion formed along the outer rotating surface of the lead-out terminal winding, and a second top ring portion formed along the end surface of the lead-out terminal winding; the second outer ring portion and the second top ring portion are connected to form a one-way flow loop; the end of the second top ring portion transitions to the outer rotating surface of the lead-out terminal winding to arrange a second loop inlet; and the second loop outlet is arranged at the starting end of the second outer ring portion.

2. A winding end cooling structure according to claim 1, characterized in that: The end of the first outer ring portion is folded to transition to the end surface of the shaft extension end winding to form the first top ring portion; The end of the first top ring portion is folded up to transition to the inner turning surface of the shaft extension end winding to form the first inner ring portion.

3. A winding end cooling structure according to claim 2, characterized in that: The first circuit outlet is located adjacent to the first circuit inlet.

4. A winding end cooling structure according to claim 3, characterized in that: The first outer ring portion, the first top ring portion, and the first inner ring portion are all arranged in a single flow channel.

5. A winding end cooling structure according to claim 1 or 4, characterized in that: The end of the second outer ring portion is folded to transition to the end surface of the lead-out terminal winding to form the second top ring portion; The second top turn portion forms a concentrically coiled double flow channel arrangement on the end surface of the lead-out terminal winding.

6. A winding end cooling structure according to claim 5, characterized in that: The second circuit outlet is located adjacent to the second circuit inlet.

7. The winding end cooling structure according to claim 1, characterized in that: The shaft extension end winding, the lead wire end winding and the electromagnetic wire in the iron core are connected correspondingly to form a coil power circuit.

8. The winding end cooling structure according to claim 1, characterized in that: The inlet and outlet of the cooling circuit differ by 10° to 20° in the circumferential direction of rotation.

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