Cooling structure of motor and its windings

Abstract

The present invention discloses a motor and a winding cooling structure thereof, relating to the technical field of motors, wherein a gap for cooling oil circulation is axially provided inside the stator; a first sealing cover and a second sealing cover are respectively connected to the two axial ends of the stator; the first sealing cover is provided with a plurality of first slots for cooling oil to flow in; the second sealing cover is provided with a plurality of second slots for cooling oil to flow out, and the diameter of the second slots is smaller than that of the first slots. The cooling oil enters the interior of the shell through the oil inlet of the shell, flows through the outer surface of the stator, enters the stator through the first slot on the first sealing cover, passes through the stator axially from the gap inside the stator to reach the second sealing cover, and gradually flows out from the second slots of the second sealing cover, so that the cooling oil gradually fills the entire internal space of the stator, and has a good cooling effect on both the outer surface and the interior of the stator.

Description

Technical Field

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

[0002] The motor works by generating a magnetic field through the windings. The damage caused by the heating of the windings is even greater than that of mechanical wear. Oil cooling, as an efficient cooling method, has gradually become the main development direction of motor cooling. Casing liquid cooling is to set up water channels inside the casing. The heat of the windings is first transferred to the stator core and then to the casing. The heat is then taken away by the coolant in the water channels in the casing. This method can only cool the windings close to the stator core, and cannot directly cool the motor windings, resulting in poor cooling effect. Summary of the Invention

[0003] 1. Technical problem to be solved by the invention

[0004] In response to the technical problem of poor cooling effect of the motor winding, the present invention provides a motor and a motor winding cooling structure. The diameter of the second slot hole is smaller than the diameter of the first slot hole, so that the cooling oil gradually fills the entire internal space of the stator, and has a good cooling effect on both the outer surface and the interior of the stator.

[0005] 2. Technical solution

[0006] To solve the above problems, the technical solution provided by the present invention is: a motor winding cooling structure, comprising a shell, a wire stator, a first sealing cover and a second sealing cover arranged inside the shell, wherein: the shell is provided with an oil inlet; a gap is provided axially inside the wire stator for cooling oil circulation; the axial ends of the wire stator are respectively connected to the first sealing cover and the second sealing cover; the first sealing cover is provided with a plurality of first slots for cooling oil to flow in; the second sealing cover is provided with a plurality of second slots for cooling oil to flow out, and the diameter of the second slots is smaller than the diameter of the first slots.

[0007] Optionally, the wire stator includes a wire stator unit, which is spliced ​​into a circular ring shape along the circumferential direction by the wire stator unit, and the wire stator unit includes an iron core, an insulating frame and a winding, the insulating frame is provided with a winding, and a gap is formed between adjacent windings, and the insulating frame is arranged between the winding and the iron core; the first sealing cover and the second sealing cover are both circular ring-shaped, the first slot is distributed along the circumference of the first sealing cover, the second slot is distributed along the circumference of the second sealing cover, and the second slot corresponds to the gap.

[0008] Optionally, the first sealing cover includes a first body, the first body is vertically provided with a first baffle and a second baffle, the first baffle is distributed along the outer circumferential edge of the first body, the second baffle is distributed along the inner circumferential edge of the first body, and the first slot is set on the first baffle; the second sealing cover includes a second body, the second body is vertically provided with a third baffle and a fourth baffle, the third baffle is distributed along the outer circumferential edge of the second body, the fourth baffle is distributed along the inner circumferential edge of the second body, and the second slot is set on the second body.

[0009] Optionally, both axial ends of the linear stator are provided with limit blocks, the first baffle and the second baffle are provided with limit holes that cooperate with the limit blocks, and the third baffle and the fourth baffle are provided with limit holes that cooperate with the limit blocks.

[0010] Optionally, an oil outlet is provided at the bottom of the shell, and the oil outlet is used to connect to a cooling box.

[0011] Optionally, a first end cover is provided on the outer side of the first sealing cover, and a second end cover is provided on the outer side of the second sealing cover, and the first end cover and the second end cover are respectively connected to the shell.

[0012] Optionally, the insulating frame has a concave portion on one side and a convex portion matching the concave portion on the other side.

[0013] Optionally, the length of the insulating frame is greater than the length of the iron core, and the limit blocks are provided at both ends of the insulating frame.

[0014] Optionally, the winding includes an enameled wire, which is formed by winding the enameled wire on an insulating frame. The winding tail end of the enameled wire is a lead wire, and the third baffle is provided with a lead hole for the lead wire to pass through.

[0015] The present invention further discloses a motor, comprising a rotating shaft, a rotor sleeved on the rotating shaft, and the motor winding cooling structure described above, wherein the rotating shaft passes through the center of the housing.

[0016] 3. Beneficial effects

[0017] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0018] (1) In the motor winding cooling structure proposed in the embodiment of the present application, cooling oil enters the interior of the shell through the oil inlet of the shell, flows through the outer surface of the stator, enters the stator through the first slot on the first sealing cover, passes axially through the stator through the gap inside the stator to reach the second sealing cover, and gradually flows out from the second slot of the second sealing cover. Since the diameter of the second slot is smaller than the diameter of the first slot, the inflow rate of the cooling oil is much greater than the outflow rate, so that the cooling oil gradually fills the entire internal space of the stator, and has a good cooling effect on both the outer surface and the interior of the stator.

[0019] (2) In the motor winding cooling structure proposed in the embodiment of the present application, the concave and convex parts of the insulating frame are overlapped in an alternating manner, thereby avoiding oil leakage at the joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 An exploded view of the motor winding cooling structure proposed in an embodiment of the present invention;

[0021] Figure 2 A schematic structural diagram of a stator of a motor winding cooling structure proposed in an embodiment of the present invention;

[0022] Figure 3 A schematic structural diagram of a first sealing cover of a motor winding cooling structure proposed in an embodiment of the present invention;

[0023] Figure 4 A schematic structural diagram of a second sealing cover of a motor winding cooling structure according to an embodiment of the present invention;

[0024] Figure 5 A schematic structural diagram of an insulating skeleton of a motor winding cooling structure proposed in an embodiment of the present invention;

[0025] Figure 6 This is a schematic structural diagram of a motor proposed in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings and embodiments.

[0027] The present application will be further described below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended solely to illustrate the relevant inventions and are not intended to limit the inventions. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the drawings. Terms such as "first" and "second" in the present application are provided for the convenience of describing the technical solutions of the present invention and do not have a specific limiting effect. They are general references and do not constitute a limitation on the technical solutions of the present invention. It should be noted that the embodiments and features therein in the present application may be combined with each other unless there is a conflict. In the description of the present invention, it should be noted that terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a communication between the two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not have contradictions or conflicts, all of which are within the scope of protection required by the present invention.

[0028] Example 1

[0029] Combined with attachment Figure 1-6The motor winding cooling structure of this embodiment includes a housing 1, a linear stator 2, a first sealing cover 3, and a second sealing cover 4 arranged inside the housing 1, wherein: the housing 1 is provided with an oil inlet 11; a gap 21 is provided axially inside the linear stator 2 for cooling oil circulation; the axial ends of the linear stator 2 are respectively connected to the first sealing cover 3 and the second sealing cover 4; the first sealing cover 3 is provided with a plurality of first slots 313 for cooling oil to flow in; the second sealing cover 4 is provided with a plurality of second slots 413 for cooling oil to flow out, and the diameter of the second slots 413 is smaller than that of the first slots 313. The cooling oil enters the interior of the housing 1 through the oil inlet 11 of the housing 1, flows through the outer surface of the linear stator 2, enters the linear stator 2 through the first slot 313 on the first sealing cover 3, passes axially through the linear stator 2 from the gap 21 inside the linear stator 2 to reach the second sealing cover 4, and gradually flows out from the second slot 413 of the second sealing cover 4. Since the diameter of the second slot 413 is smaller than the diameter of the first slot 313, the inflow rate of the cooling oil is much greater than the outflow rate, so that the cooling oil gradually fills the entire internal space of the linear stator 2, and has a good cooling effect on both the outer surface and the interior of the linear stator 2.

[0030] Example 2

[0031] Combined with attachment Figure 1-6Compared with the technical solution of Example 1, the motor winding cooling structure of this embodiment can be improved as follows: the wire stator 2 includes a wire stator unit 22, and the wire stator 2 is spliced ​​into a circular ring along the circumferential direction by the wire stator unit 22. The wire stator unit 22 includes an iron core 221, an insulating frame 222 and a winding 223. The insulating frame 222 is provided with a winding 223, and a gap 21 is formed between adjacent windings 223. The insulating frame 222 is arranged between the winding 223 and the iron core 221; the first sealing cover 3 and the second sealing cover 4 are both annular, the first slots 313 are distributed along the circumference of the first sealing cover 3, the second slots 413 are distributed along the circumference of the second sealing cover 4, and the second slots 413 correspond to the gaps 21. The winding 223 is formed by winding the enameled wire 2231 on the insulating frame 222. When the wire stator unit 22 is spliced ​​along the circumferential direction to form the wire stator 2, gaps 21 for cooling oil to pass through will be formed between adjacent windings 223 due to the different positions of the enameled wire 2231 wound on the insulating frame 222, so as to achieve cooling of the winding 223. Cooling oil enters the housing 1 through the oil inlet 11, flows through the iron core 221, and then enters the winding 223 through the first slot 313 in the first sealing cover 3. It then axially passes through the stator 2 through the gap 21 between the windings 223 to reach the second sealing cover 4, and gradually flows out through the second slot 413 corresponding to the gap 21, effectively cooling both the iron core 221 and the winding 223. The first and second sealing covers 3 and 4 correspond to the structure of the stator 2, ensuring a sealing effect when mated. The insulating frame 222 isolates the winding 223 from the iron core 221, ensuring good insulation between the winding 223 and the iron core 221 and preventing short circuits. Both the first and second sealing covers 3 and 4 are constructed with glass fiber polyphenylene sulfide (PPS-40GF) board. PPS-40% GF board has excellent high temperature resistance, wear resistance, and flame resistance, making it the preferred material for the first and second sealing covers 3 and 4.

[0032] Example 3

[0033] Combined with attachment Figure 1-6Compared to the technical solutions of Examples 1 or 2, the motor winding cooling structure of this embodiment can be improved as follows: the first sealing cover 3 includes a first body 31, which is vertically provided with a first baffle 311 and a second baffle 312. The first baffle 311 is distributed along the outer circumferential edge of the first body 31, and the second baffle 312 is distributed along the inner circumferential edge of the first body 31. The first slot 313 is provided on the first baffle 311. The second sealing cover 4 includes a second body 41, which is vertically provided with a third baffle 411 and a fourth baffle 412. The third baffle 411 is distributed along the outer circumferential edge of the second body 41, and the fourth baffle 412 is distributed along the inner circumferential edge of the second body 41. The second slot 413 is provided on the second body 41. The provision of the first baffle 311 and the second baffle 312 prevents cooling oil from leaking toward the outer wall of the first sealing cover 3, while the provision of the third baffle 411 and the fourth baffle 412 prevents cooling oil from leaking toward the outer wall of the second sealing cover 4.

[0034] Example 4

[0035] Combined with attachment Figure 1-6 Compared to any of the technical solutions in Examples 1-3, the motor winding cooling structure of this embodiment can be improved as follows: Limit blocks 224 are provided at both axial ends of the linear stator 2. The first and second baffles 311 and 312 are provided with limiting holes 314 that cooperate with the limit blocks 224. The third and fourth baffles 412 are provided with limiting holes 314 that cooperate with the limit blocks 224. The first and third baffles 311 and 312 fasten the first and second sealing covers 3 and 4 to the outer circumference of the linear stator 2, while the second and fourth baffles 312 and 312 fasten the first and second sealing covers 3 and 4 to the inner circumference of the linear stator 2, thereby sealing the linear stator 2.

[0036] Example 5

[0037] Combined with attachment Figure 1-6 The motor winding cooling structure of this embodiment, compared to any of the technical solutions in Examples 1-4, can be improved as follows: An oil outlet 12 is provided at the bottom of the housing 1 for connection to a cooling tank. Cooling oil flows out of the second slot 413, collects under gravity at the bottom of the housing 1, and then returns to the cooling tank for collection through the oil outlet 12.

[0038] Example 6

[0039] Combined with attachment Figure 1-6Compared to any of the technical solutions in Examples 1-5, the motor winding cooling structure of this embodiment can be improved as follows: a first end cap 5 is provided on the outside of the first sealing cover 3, and a second end cap 6 is provided on the outside of the second sealing cover 4. The first end cap 5 and the second end cap 6 are respectively connected to the housing 1. The first end cap 5, the second end cap 6, and the housing 1 form a closed cavity, protecting the first sealing cover 3, the second sealing cover 4, and the stator 2 from external damage.

[0040] Example 7

[0041] Combined with attachment Figure 1-6 Compared to any of the technical solutions in Examples 1-6, the motor winding cooling structure of this embodiment can be improved as follows: the insulating frame 222 has a recessed portion 2221 on one side and a protrusion 2222 on the other side that cooperates with the recessed portion 2221. The recessed portions 2221 and the protrusions 2222 of the insulating frame 222 are staggered and overlapped, preventing oil leakage at the joints.

[0042] Example 8

[0043] Combined with attachment Figure 1-6 Compared to any of the technical solutions in Examples 1-7, the motor winding cooling structure of this embodiment can be improved as follows: the length of the insulating frame 222 is greater than the length of the iron core 221, and the stop blocks 224 are provided at both ends of the insulating frame 222. The insulating frame 222 is made of a vinyl chloride plate and has a certain degree of elasticity. When the stop blocks 224 engage or disengage with the stop holes 314, minimal damage is caused.

[0044] Example 9

[0045] Combined with attachment Figure 1-6 Compared to any of the technical solutions in Examples 1-8, the motor winding cooling structure of this embodiment can be improved as follows: the winding 223 includes an enameled wire 2231, which is wound around an insulating frame 222. The winding end of the enameled wire 2231 is a lead wire 2232, and the third baffle 411 is provided with a lead wire hole 4111 for the lead wire 2232 to pass through. The enameled wire 2231 is wound around the insulating frame 222 to form the winding 223. The lead wire 2232 passes through the lead wire hole 4111 and is connected to an external power source, so that when the winding 223 is energized, a magnetic field is generated.

[0046] Example 10

[0047] Combined with attachment Figure 1-6The motor of this embodiment includes a rotating shaft (not shown), a rotor (not shown) sleeved on the rotating shaft (not shown), and the motor winding cooling structure described in any one of the technical solutions of Embodiments 1 to 9. The rotating shaft (not shown) passes through the center of the housing 1. When the winding 223 is energized, the stator 2 generates a rotating magnetic field. The rotor (not shown) cuts through the rotating magnetic field to generate an induced electromotive force and current, which in turn generates an electromagnetic torque that rotates the rotating shaft (not shown), generating torque output. The cooling oil enters the interior of the housing 1 through the oil inlet 11 of the housing 1, flows through the iron core 221, enters the winding 223 through the first slot 313 on the first sealing cover 3, passes axially through the stator 2 from the gap 21 between the windings 223 to reach the second sealing cover 4, and gradually flows out from the second slot 413 corresponding to the gap 21, which has a good cooling effect on the iron core 221 and the winding 223; the first sealing cover 3 and the second sealing cover 4 correspond to the structure of the stator 2, ensuring that a sealing effect can be achieved when matched. The cooling oil circuit is composed of the oil inlet 11, the first slot 313, the gap 21, the second slot 413 and the oil outlet 12, which can simultaneously achieve cooling of the outer surface (i.e., the iron core 221) and the interior (winding 223) of the stator 2, without the need for additional oil circuits, making the internal structure of the motor compact and small in size. The good cooling effect prevents the motor from being damaged by high temperature, greatly improving the performance and working efficiency of the motor.

[0048] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs a structure and embodiment similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A motor winding cooling structure, characterized in that: The invention comprises a housing, a stator, a first sealing cover and a second sealing cover arranged inside the housing, wherein: The housing is provided with an oil inlet; A gap is provided inside the stator along the axial direction for cooling oil to flow; The axial ends of the stator are respectively connected to a first sealing cover and a second sealing cover; The first sealing cover is provided with a plurality of first slots for cooling oil to flow into; The second sealing cover is provided with a plurality of second slots for cooling oil to flow out, wherein the diameter of the second slots is smaller than the diameter of the first slots; The wire stator includes a wire stator unit, which is spliced ​​into a circular ring along the circumferential direction. The wire stator unit includes an iron core, an insulating frame and a winding. The winding is provided on the insulating frame, and gaps are formed between adjacent windings. The insulating frame is provided between the winding and the iron core. The first sealing cover and the second sealing cover are both annular, the first slots are distributed along the circumference of the first sealing cover, the second slots are distributed along the circumference of the second sealing cover, and the second slots correspond to the gaps; The first sealing cover includes a first body, wherein a first baffle and a second baffle are vertically provided on the first body, wherein the first baffle is distributed along the outer circumferential edge of the first body, and the second baffle is distributed along the inner circumferential edge of the first body, and the first slot is provided on the first baffle; The second sealing cover includes a second body, the second body is vertically provided with a third baffle and a fourth baffle, the third baffle is distributed along the outer circumferential edge of the second body, the fourth baffle is distributed along the inner circumferential edge of the second body, and the second slot is provided on the second body; both axial ends of the stator are provided with limit blocks, the first baffle and the second baffle are provided with limit holes that cooperate with the limit blocks, and the third baffle and the fourth baffle are provided with limit holes that cooperate with the limit blocks; The bottom of the shell is provided with an oil outlet, and the oil outlet is used to connect to the cooling box; The cooling oil enters the shell through the oil inlet of the shell, flows through the outer surface of the linear stator, enters the linear stator through the first slot on the first sealing cover, passes axially through the linear stator through the gap inside the linear stator to reach the second sealing cover, and gradually flows out from the second slot of the second sealing cover.

2. The motor winding cooling structure according to claim 1, characterized in that: A first end cover is provided on the outer side of the first sealing cover, and a second end cover is provided on the outer side of the second sealing cover. The first end cover and the second end cover are respectively connected to the housing.

3. The motor winding cooling structure according to claim 1, characterized in that: One side of the insulating frame has a concave portion, and the other side has a convex portion matched with the concave portion.

4. The motor winding cooling structure according to claim 1, characterized in that: The length of the insulating frame is greater than the length of the iron core, and the limit blocks are arranged at both ends of the insulating frame.

5. The motor winding cooling structure according to claim 1, characterized in that: The winding comprises an enameled wire, which is formed by winding the enameled wire on an insulating frame. The winding tail end of the enameled wire is a lead wire, and the third baffle is provided with a lead hole for the lead wire to pass through.

6. A motor, characterized in that: The motor winding cooling structure comprises a rotating shaft, a rotor sleeved on the rotating shaft, and the motor winding cooling structure according to any one of claims 1 to 5, wherein the rotating shaft passes through the center of the housing.

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