Winding cooling structure and cooling system in motor stator slot

Abstract

The present invention relates to the field of motor cooling technology, and in particular to a winding cooling structure and cooling system in a motor stator slot, which aims to solve the problem of poor heat dissipation performance during motor operation and inability to effectively reduce the temperature of the coil winding. The winding cooling structure in the motor stator slot provided by the present invention includes a stator core, an insulating assembly, a winding assembly and an insulating sleeve; the inner wall of the stator core is provided with a groove; the insulating sleeve is inserted into the stator core to form a through hole extending along the axial direction of the stator core; the winding assembly includes a coil winding, and the coil winding is placed in the through hole; the insulating assembly includes an insulating member, the insulating member is arranged as a spiral structure, and the insulating member is wrapped around the outer surface of the coil winding, so that a flow channel extending along the axial direction of the stator core is formed between the coil winding and the inner wall of the through hole; the cooling medium is configured to flow along the flow channel. The winding cooling structure in the motor stator slot provided by the present invention can effectively reduce the temperature of the coil winding.

Description

Technical Field

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

[0002] Motor cooling has always been an important research direction in the motor field. In the process of developing high torque density, high power density and other motors, cooling issues have always been an important factor restricting the research and development of motors. Motor cooling directly affects the performance and service life of the motor. Therefore, improving the heat dissipation performance during motor operation is of great significance to the research of high-performance motors.

[0003] Regarding the cooling problem of the motor, the main research direction at this stage is: on the basis of adopting a new and efficient heat dissipation method, the cooling structure of the motor is optimized to achieve the purpose of improving the heat dissipation performance. At present, in terms of the structural optimization of the motor, the method of adding heat dissipation channels to the motor casing or increasing the area of ​​the heat dissipation ribs can speed up the heat dissipation rate of the motor surface, but the heat generated by the coil winding located on the inside needs to be transferred to the iron core first, and then conducted to the casing, which is difficult to dissipate directly. There are still problems such as excessive temperature at the coil winding and uneven temperature distribution. The method of setting a heat dissipation structure in the axial or radial direction of the stator core can improve the heat dissipation performance of the motor to a certain extent, but the heat of the winding in the slot still needs to be dissipated through the iron core, and the effect on controlling the temperature rise of the winding in the slot is limited.

[0004] Furthermore, a metal tube is arranged in the stator slot to provide an axial flow channel for the cooling medium in the slot, which can effectively reduce the temperature rise of the winding in the slot. However, the metal tube occupies a large structural space, which reduces the slot utilization rate of the motor. In addition, the structural deformation of the metal tube makes it difficult to ensure the performance of the cooling channel. Secondly, the metal tube also poses a risk to the insulation of the coil in the slot. Therefore, the cooling method of arranging a metal tube in the slot is rarely used. In addition, a heat pipe is arranged in the slot to efficiently extract the heat of the winding in the slot, but the arrangement of the heat pipe in the slot and the secondary cooling are difficult to implement. Therefore, the current motor has poor heat dissipation performance during operation and cannot effectively reduce the temperature of the coil winding. Summary of the invention

[0005] The object of the present invention is to provide a winding cooling structure and a cooling system in a motor stator slot to solve the problem that the heat dissipation performance is poor and the coil winding temperature cannot be effectively reduced during the operation of the motor.

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0007] In a first aspect, the present invention provides a cooling structure for windings in a stator slot of a motor, comprising: a stator core, an insulating assembly, a winding assembly and an insulating sleeve;

[0008] The inner wall of the stator core is provided with a groove extending along the axis direction of the stator core, and the opening of the groove points to the axis of the stator core;

[0009] The insulating sleeve is inserted into the stator core and closes the opening of the groove to form a through hole extending along the axial direction of the stator core;

[0010] The winding assembly includes a coil winding, and the coil winding is placed in the through hole;

[0011] The insulating assembly includes an insulating member, which is arranged in a spiral structure and is wrapped around the outer surface of the coil winding, so that a flow channel extending along the axial direction of the stator core is formed between the coil winding and the inner wall of the through hole;

[0012] A cooling medium is configured to flow along the flow channel.

[0013] In an alternative embodiment,

[0014] The flow channel is formed by the outer surface of the coil winding not wrapped by the insulating member and the inner wall of the groove;

[0015] The flow channel is spiral-shaped.

[0016] In an alternative embodiment,

[0017] Openings are provided at both ends of the insulating member, and both ends of the coil winding extend out of the insulating member.

[0018] In an alternative embodiment,

[0019] An inlet and an outlet are respectively provided at both ends of the flow channel;

[0020] The cooling medium enters the flow channel from the inlet, flows through the flow channel, and then flows out from the outlet.

[0021] In an alternative embodiment,

[0022] The inlet is arranged at one end of the stator core, and the gap between the insulating member and the inner wall of the groove forms the inlet.

[0023] In an alternative embodiment,

[0024] The outflow port is arranged at the other end surface of the stator core, and the gap between the insulating member and the inner wall of the groove forms the outflow port.

[0025] In an alternative embodiment,

[0026] The motor stator slot inner winding cooling structure also includes a motor casing;

[0027] The motor housing is provided with a cooling medium inlet and a cooling medium outlet;

[0028] The cooling medium inlet is in communication with the inlet;

[0029] The cooling medium outlet is in communication with the outflow port.

[0030] In an alternative embodiment,

[0031] The outer surface of the insulating member is tightly fitted to the slot wall of the stator core.

[0032] In an alternative embodiment,

[0033] The insulating member is made of electrical insulating material.

[0034] In a second aspect, the present invention provides a cooling system comprising the above-mentioned winding cooling structure in the stator slot of the motor.

[0035] Based on the above technical solutions, the technical effects that can be achieved by the present invention are:

[0036] The present invention provides a cooling structure for windings in stator slots of a motor, comprising: a stator core, an insulating assembly, a winding assembly and an insulating sleeve; the inner wall of the stator core is provided with a groove extending along the axial direction of the stator core, and the opening of the groove points to the axis of the stator core; the insulating sleeve is inserted into the stator core and closes the opening of the groove to form a through hole extending along the axial direction of the stator core; the winding assembly comprises a coil winding, and the coil winding is placed in the through hole; the insulating assembly comprises an insulating member, the insulating member is arranged in a spiral structure, and the insulating member is wrapped around the outer surface of the coil winding, so that a flow channel extending along the axial direction of the stator core is formed between the coil winding and the inner wall of the through hole; and the cooling medium is configured to flow along the flow channel.

[0037] The stator core is provided with a groove with its opening pointing to its own axis. The insulating sleeve is inserted into the stator core and the opening of the groove is closed at the same time, thereby forming a through hole extending along the axis of the stator core. The insulating part is wound on the coil winding, and the coil winding can be inserted in the through hole. An axial flow channel is formed between the coil winding and the inner wall of the through hole. The medium flows axially along the flow channel and exchanges heat with the coil winding to achieve the purpose of cooling the coil winding, thereby solving the problem of poor heat dissipation performance during motor operation and inability to effectively reduce the coil winding temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 A schematic diagram of the structure of an insulating member provided in an embodiment of the present invention;

[0040] Figure 2 A schematic diagram of the structure of an insulating member and a coil winding provided in an embodiment of the present invention;

[0041] Figure 3 The embodiment of the present invention provides Figure 2 A top view of

[0042] Figure 4 The embodiment of the present invention provides Figure 2 Left view of

[0043] Figure 5 A schematic diagram of the flow direction of the cooling medium along the outer surface of the coil winding provided by an embodiment of the present invention;

[0044] Figure 6 A schematic diagram of the end surface of the coil winding and the insulating member provided in the embodiment of the present invention in the stator core;

[0045] Figure 7 It is a structural schematic diagram of the positions of the insulation component and the winding component in the overall motor;

[0046] Figure 8 It is a schematic diagram of the overall structure of the motor.

[0047] Icon: 100- stator core; 200- insulation assembly; 210- insulation part; 300- winding assembly; 310- coil winding; 400- insulation sleeve; 500- rotor; 600- motor housing. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0051] Regarding the cooling problem of the motor, the main research direction at this stage is: on the basis of adopting a new and efficient heat dissipation method, the cooling structure of the motor is optimized to achieve the purpose of improving the heat dissipation performance. However, the heat dissipation performance is still poor during the operation of the motor, and the coil winding temperature cannot be effectively reduced.

[0052] In view of this, the present invention provides a winding cooling structure in a stator slot of a motor, comprising: a stator core 100, an insulating assembly 200, a winding assembly 300 and an insulating sleeve 400; the inner wall of the stator core 100 is provided with a groove extending along the axial direction of the stator core 100, and the opening of the groove points to the axis of the stator core 100; the insulating sleeve 400 is inserted into the stator core 100, and the opening of the groove is closed to form a through hole extending along the axial direction of the stator core 100; the winding assembly 300 includes a coil winding 310, and the coil winding 310 is placed in the through hole; the insulating assembly 200 includes an insulating member 210, the insulating member 210 is arranged as a spiral structure, and the insulating member 210 is wrapped around the outer surface of the coil winding 310, so that a flow channel extending along the axial direction of the stator core 100 is formed between the coil winding 310 and the inner wall of the through hole; the cooling medium is configured to flow along the flow channel.

[0053] The stator core 100 is provided with a groove with its opening pointing to its own axis. The insulating sleeve 400 is inserted into the stator core 100 and the opening of the groove is closed at the same time, thereby forming a through hole extending along the axis direction of the stator core 100. The insulating member 210 is wound on the coil winding 310, and the coil winding 310 can be inserted in the through hole. An axial flow channel is formed between the coil winding 310 and the inner wall of the through hole. The medium flows axially along the flow channel and exchanges heat with the coil winding 310 to achieve the purpose of cooling the coil winding 310, thereby solving the problem of poor heat dissipation performance during motor operation and inability to effectively reduce the coil winding temperature.

[0054] The following combination Figures 1 to 8 The structure and shape of the winding cooling structure in the stator slot of the motor provided in this embodiment are described in detail.

[0055] In this embodiment, the axial direction is the direction along the central axis of the stator core 100 .

[0056] Regarding the shape and structure of the stator core 100, in detail:

[0057] The stator core 100 is an important part of the motor, which serves to fix the coil winding 310 and form a magnetic flux loop. It is generally stamped from silicon steel sheets and is cylindrical in shape. The inner wall of the stator core 100 is provided with a groove extending along the axis of the stator core 100, and the opening of the groove points to the axis of the stator core 100.

[0058] In order to close the opening of the groove, an insulating sleeve 400 is further provided in this embodiment.

[0059] The insulating sleeve 400 is inserted into the stator core 100 and closes the opening of the groove to form a through hole extending along the axial direction of the stator core 100. Specifically, the insulating sleeve 400 is cylindrical in structure and is inserted into the stator core 100. Its outer surface is closely fitted with the inner surface of the motor stator core 100, and forms a sealed space together with the motor end cover and the motor housing 600 to isolate the rotor part, so that the cooling medium can flow in the sealed space of the stator part.

[0060] Regarding the shape and structure of the winding assembly 300 and the insulating assembly 200, in detail:

[0061] The winding assembly 300 includes a plurality of coil windings 310, which are placed in the through holes. Specifically, the coil windings 310 can be placed in the through holes in a variety of ways, and can be inserted into the through holes. The coil windings 310 are conductors placed in the slots of the stator core 100, and play a role in conducting current.

[0062] The insulation assembly 200 includes a plurality of insulation members 210, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the insulating member 210 is arranged in a spiral structure, and openings are arranged at both ends of the insulating member 210, and the insulating member 210 is wrapped around the outer surface of the coil winding 310, so that the coil winding 310 is changed from a traditional full wrapping form to a partial wrapping form, and both ends of the coil winding 310 extend out of the insulating member 210. Specifically, the insulating member 210 is spiral in space, has a certain thickness, and is made of insulating material. The reason why electrical insulating material is used is because of its high resistivity, which is used to isolate conductors with different potentials.

[0063] Furthermore, the outer surface of the insulating member 210 is tightly fitted with the slot wall of the stator core 100. At the same time, the insulating member 210 is wound around the surface of the coil winding 310 and is tightly fitted with the surface. The insulating member 210 is positioned between the slot wall of the stator core 100 and the coil winding 310, and mainly serves as insulation.

[0064] Furthermore, in a complete motor structure, there are usually a large number of insulating members 210 and coil windings 310 that together constitute a complete insulating assembly 200 and a complete winding assembly 300, which are placed in the slots of the stator core.

[0065] Furthermore, a flow channel extending along the axial direction of the stator core 100 is formed between the coil winding 310 and the inner wall of the through hole. Since the insulating member 210 is wound on the coil winding 310, the outer surface of the coil winding 310 wrapped with the insulating member 210 is closely attached to the slot wall of the stator core 100, and the outer surface of the coil winding 310 not wrapped with the insulating member 210 forms a gap with the slot wall of the stator core 100. The gap is connected in the axial direction and passes through the two end faces of the stator core 100, forming an axial flow channel in the slot.

[0066] Furthermore, the flow channel is spiral, and the outer surface of the coil winding 310 not wrapped by the insulating member 210 and the inner wall of the groove form a flow channel, and the cooling medium can flow along the flow channel. Specifically, the flow channel is the gap formed by the insulating member 210 between the slot wall of the stator core 100 and the coil winding 310, and a spiral flow channel is formed along the axial direction. By adjusting the thickness and spacing width of the insulating component 200, the height and width of the spiral axial flow channel can be adjusted. The cooling medium is generally a flowable liquid that can undergo convection heat exchange with a high-temperature object in direct contact, absorb heat, and has good insulation properties when in contact with a conductor.

[0067] In order to allow the cooling medium to flow into and out of the flow channel, an inlet and an outlet are respectively provided at both ends of the flow channel. The cooling medium enters the flow channel from the inlet, flows through the flow channel, and then flows out from the outlet.

[0068] Specifically, the inlet is provided at one end of the stator core 100, and the gap between the insulating member 210 and the inner wall of the groove forms the inlet; the outlet is provided at the other end surface of the stator core 100, and the gap between the insulating member 210 and the inner wall of the groove forms the outlet. In other words, there are portions at both ends of the coil winding 310 that are not covered by the insulating member 210, thereby forming an inlet and an outlet for the cooling medium.

[0069] Furthermore, if Figure 7As shown, a rotor 500 is coaxially arranged inside the stator core 100, and a motor housing 600 is also arranged outside the stator core 100. The motor housing 600 is provided with a cooling medium inlet and a cooling medium outlet; the cooling medium inlet is connected to the flow inlet, and the cooling medium outlet is connected to the flow outlet.

[0070] The working process of the winding cooling structure in the stator slot of the motor provided in this embodiment is as follows:

[0071] Among the optional solutions of this embodiment, it is more preferred that Figure 5 As shown, the insulating member 210 forms a gap between the slot wall of the stator core 100 and the coil winding 310, and forms a spiral flow channel along the axial direction. The cooling medium for heat dissipation of the motor flows into the flow inlet through the cooling medium inlet, flows through the cooling channel, and finally flows out from the cooling medium outlet through the flow outlet. The flow direction is as shown in FIG. Figure 5 As indicated by the arrow in the middle, when the cooling medium flows through the flow channel, it contacts the coil winding 310 whose outer surface is not wrapped by the insulating member 210 and the slot wall of the stator core 100, and conducts convection heat exchange to remove the heat. This heat is the core loss and coil winding 310 loss generated by the operation of the motor.

[0072] Specifically, if Figure 8 As shown, inside the motor, the motor housing 600, the insulating sleeve 400 and the end covers on both sides together form a sealed space. The cooling medium is injected into the sealed space from the cooling medium inlet, flows in through the inlet at one end of the stator core 100, flows in the flow channel, and flows out from the outlet at the other end. The flow direction is as shown in FIG. Figure 8 As indicated by the middle arrow, the high-temperature cooling medium finally flows out from the cooling medium outlet to the outside of the motor. Figure 8 The cooling medium inlet, cooling medium outlet, flow inlet and flow outlet are marked.

[0073] This embodiment is used to solve the problem of serious heating of the stator winding during the operation of a high power density motor. The cooling medium flows axially along the flow channel and exchanges heat with the coil winding to achieve the purpose of cooling the coil winding. The height and width of the spiral axial flow channel are adjusted by the thickness and spacing width of the spiral insulation material, which not only ensures the mechanical strength and insulation performance of the insulation structure, but also ensures the cooling performance of the coil winding in the slot, improves the heat dissipation performance during the operation of the motor, and effectively reduces the temperature of the coil winding.

[0074] Since the technical effect of the cooling system provided in this embodiment is the same as the technical effect of the winding cooling structure in the stator slot of the motor provided in the above embodiment, it will not be repeated here.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A winding cooling structure in a motor stator slot, characterized in that: include: A stator core (100), an insulating assembly (200), a winding assembly (300) and an insulating sleeve (400); The inner wall of the stator core (100) is provided with a groove extending along the axial direction of the stator core (100), and the opening of the groove points to the axis of the stator core (100); The insulating sleeve (400) is inserted into the stator core (100) and closes the opening of the groove to form a through hole extending along the axial direction of the stator core (100); The winding assembly (300) comprises a coil winding (310), and the coil winding (310) is placed in the through hole; The insulating component (200) comprises an insulating member (210), the insulating member (210) being arranged in a spiral structure, and the insulating member (210) being wrapped around the outer surface of the coil winding (310), so that a flow channel extending along the axial direction of the stator core (100) is formed between the coil winding (310) and the inner wall of the through hole; A cooling medium is configured to flow along the flow channel; The flow channel is formed by the outer surface of the coil winding (310) not covered by the insulating member (210) and the inner wall of the groove; The flow channel is spiral-shaped.

2. The motor stator slot winding cooling structure according to claim 1, characterized in that: Openings are provided at both ends of the insulating member (210), and both ends of the coil winding (310) extend out of the insulating member (210).

3. The motor stator slot winding cooling structure according to claim 2, characterized in that: An inlet and an outlet are respectively provided at both ends of the flow channel; The cooling medium enters the flow channel from the inlet, flows through the flow channel, and then flows out from the outlet.

4. The motor stator slot winding cooling structure according to claim 3, characterized in that: The inlet is arranged at one end of the stator core (100), and the gap between the insulating member (210) and the inner wall of the groove forms the inlet.

5. The motor stator slot winding cooling structure according to claim 4, characterized in that: The outflow port is arranged on the other end surface of the stator core (100), and the gap between the insulating member (210) and the inner wall of the groove forms the outflow port.

6. The motor stator slot winding cooling structure according to claim 5, characterized in that: Also includes a motor housing (600); The motor housing (600) is provided with a cooling medium inlet and a cooling medium outlet; The cooling medium inlet is in communication with the inlet; The cooling medium outlet is in communication with the outflow port.

7. The motor stator slot winding cooling structure according to claim 1, characterized in that: The outer surface of the insulating member (210) is tightly fitted to the slot wall of the stator core (100).

8. The motor stator slot winding cooling structure according to claim 1, characterized in that: The insulating member (210) is made of electrical insulating material.

9. A cooling system, characterized in that: It comprises the winding cooling structure in the stator slot of the motor as described in any one of claims 1 to 8.

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