Stator structure and motor

Abstract

The utility model discloses a stator structure and a motor, and relates to the technical field of motors, the stator structure comprises a stator iron core, the stator iron core is provided with a stator yoke part and a plurality of stator grooves which are located at the inner side of the stator yoke part and are through along the axial direction, each stator groove is internally provided with an insulator which is attached to the groove wall of the stator groove, and the insulator is internally provided with a through hole which is through along the axial direction. The two ends of the insulator respectively extend out of the stator grooves from the two end faces of the stator core to form insulator end portions, and the insulator end portions are configured to enable the minimum air distance between the wires and the end faces of the stator core to be larger than the creepage distance, so that the insulativity between the wires and the end faces of the stator core is guaranteed. Safety problems of motor short circuit, electric leakage and the like caused by too small creepage distance between the lead and the end face of the stator core are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a stator structure and a motor. Background Art

[0002] With the continuous improvement of the voltage platform of the electric drive system, higher and higher requirements are placed on the insulation and heat dissipation performance of the motor. In most drive motors on the market, the stator slots are mainly wrapped with insulating paper, and then the gaps between the insulating paper and the stator slot wall and between the insulating paper and the wire are filled by dripping paint. However, due to the presence of bubbles during dripping paint, the filling rate cannot be 100%, which is very unfavorable for the wire to transfer heat to the stator core through the insulating paper.

[0003] At present, although there are some motors on the market that have insulating materials injected into the stator slots to form insulators to replace insulating paper to separate the stator core and the wires, the heat dissipation effect of this type of motor is still not ideal, and the insulators are only provided inside the stator slots, which results in the creepage distance between the wires and the end faces of the stator core being too short. When the motor is subjected to high voltage, it is easy for the wires and the end faces of the stator core to conduct electricity, thereby causing safety problems such as motor short circuit and leakage. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a stator structure and a motor to solve at least one of the problems existing in the prior art: poor heat dissipation effect of the motor and too short creepage distance between the conductor and the end face of the stator core.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] In a first aspect, the utility model provides a stator structure, wherein the stator core has a stator yoke and a plurality of stator slots located on the inner side of the stator yoke and axially extending therethrough, each of the stator slots is provided with an insulator fitted with its slot wall, the insulator is provided with an axially extending through hole, a plurality of conductors are passed through the through hole, two ends of the insulator respectively extend from the two end surfaces of the stator core to form insulator ends, and the insulator ends are configured so that the minimum air distance separating the conductor from the end surface of the stator core is greater than the creepage distance.

[0007] In one embodiment of the utility model: the wall thickness of the insulator in the stator slot is W1, and the thickness of the end of the insulator is W2, wherein W1 <W2。

[0008] In one embodiment of the utility model: adjacent ends of the insulators are connected along the circumferential direction.

[0009] In one embodiment of the utility model: the height H of each end of the insulator in the axial direction is not less than the wall thickness W1 of the insulator in the stator slot.

[0010] In one embodiment of the utility model: the stator slot is an open slot, and the thickness L of the insulator corresponding to the slot opening of the stator slot is greater than the wall thickness W1 of the slot wall portion of the insulator in the stator slot.

[0011] In one embodiment of the utility model: an oil outlet hole is correspondingly provided between two adjacent stator slot ports, and the oil outlet hole is located on the end surface of the stator yoke.

[0012] In one embodiment of the utility model: a cooling oil channel is opened on the stator yoke, and the cooling oil channel includes a plurality of axial oil channels penetrating along the axial direction and a circumferential oil channel arranged along the circumferential direction and connected with each of the axial oil channels, the axial oil channel is connected to the oil outlet hole, and the circumferential oil channel is provided with an oil inlet hole.

[0013] In one embodiment of the utility model: the radial dimension of the axial oil passage is greater than the circumferential dimension.

[0014] In one embodiment of the utility model: the wire is a flat wire.

[0015] In a second aspect, the utility model provides a motor, comprising the stator structure described above.

[0016] One or more of the above embodiments of the present invention have at least one or more of the following beneficial effects:

[0017] 1. The present application forms insulator ends by extending the stator slots from both end faces of the stator core respectively, so that the insulator ends are configured so that the minimum air distance separating the conductor from the end faces of the stator core is greater than the creepage distance, thereby ensuring the insulation between the conductor and the end faces of the stator core and avoiding safety problems such as motor short circuit and leakage caused by too small a creepage distance between the conductor and the end faces of the stator core.

[0018] 2. The present application provides an axial oil passage between two adjacent stator slots, and the heat conductivity of the wire is improved by the insulator provided in the stator slot, thereby greatly improving the heat dissipation effect of the wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings.

[0020] Figure 1 This is a stator structure assembly diagram in one embodiment of the utility model;

[0021] Figure 2 This is an enlarged cross-sectional view of a stator slot in an embodiment of the utility model;

[0022] Figure 3 yes Figure 1 A magnified view of the structure at center;

[0023] Figure 4 This is an axial section view of the stator structure in one embodiment of the utility model;

[0024] Figure 5 yes Figure 4 A magnified view of the structure at B in the middle;

[0025] Figure 6 It is a schematic diagram of the expansion structure of the cooling oil channel in one embodiment of the utility model.

[0026] Description of reference numerals:

[0027] 1. stator core; 11. stator yoke; 12. stator slot; 121. slot; 2. insulator; 21. port; 3. wire; 4. oil outlet; 5. cooling oil channel; 51. axial oil channel; 52. circumferential oil channel. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] See also Figure 1-3 As shown, the present application discloses a stator structure, including a stator core 1, the stator core 1 has a stator yoke 11 and a plurality of stator slots 12 located inside the stator yoke 11 and axially penetrated, and the plurality of stator slots 12 are evenly distributed on the inside of the stator yoke 11 along the circumferential direction. An insulator 2 is provided in each stator slot 12, and an axially penetrating through hole is provided in the insulator 2, and the wire 3 can be passed through the through hole and arranged on the stator core 1 to form a stator winding. The insulator 2 is formed by injection molding or spraying process. Compared with the use of insulating paper, the insulator 2 and the stator core 1 form a whole, and the insulator 2 can be closely attached to the wall of the stator slot 12, avoiding the need for dripping paint to fill the gap between the insulator 2 and the wall of the stator slot 12, and facilitating heat transfer between the insulator 2 and the stator core 1. And the gap between the insulator 2 and the wire 3 can be reserved smaller than the gap between the insulating paper and the wire 3, which improves the slot full rate of the stator and thus improves the performance of the motor. In this example, the insulator 2 can be made of a material with good insulation, good thermal conductivity, and good strength, and there is no specific limitation on the specific type of the material.

[0030] In one example, the wire 3 is a flat wire. Compared with a cylindrical wire, the flat wire is more conducive to its own heat dissipation and improves the overall heat dissipation effect of the motor. Preferably, the wire 3 is a flat copper wire.

[0031] Both ends of the insulator 2 extend from both end faces of the stator core 1 out of the stator slots 12 to form the ends of the insulator 2. The ends of the insulator 2 are configured such that the minimum air distance separating the wire 3 from the end face of the stator core 1 is greater than the creepage distance, ensuring that there is a sufficient distance between the wire 3 near the port 21 of the stator slot 12 and the end face of the stator core 1 to avoid creepage, that is, ensuring that there is a sufficient electrical distance between the wire 3 after turning and the end face of the stator core 1, thereby ensuring the insulation performance of the stator at a high voltage platform such as an 800V voltage platform.

[0032] In one example, please refer to Figure 4 and Figure 5 As shown, the wall thickness of the insulator 2 within the stator slot 12 is W1, and the thickness of the end of the insulator 2 is W2, where W1 < W2. The end of the insulator 2 also has an axial height H. Since the creepage distance between the wire 3 and the end face of the stator core 1 is equal to W2 + H, compared with the case where the wall thickness W1 of the insulator 2 within the stator slot 12 is equal to the thickness W2 of the end of the insulator 2, in this application, with W1 < W2, on the premise of meeting the creepage distance between the wire 3 and the end face of the stator core 1, the axial height H of the end of the insulator 2 can be reduced, making the length of the wire 3 wrapped by the end of the insulator 2 shorter, thereby shortening the length of the wire 3 extending out of the stator core 1 axially, reducing the height of the motor end, enabling the axial dimension of the motor to be smaller, and improving the motor power density. And by setting the dimension of W2 to be greater than the dimension of W1, the side of the end of the insulator 2 close to the stator core 1 can be made to fit the end face of the stator core 1, improving the bonding strength between the insulator 2 and the stator core 1.

[0033] In one example, considering the injection molding process, the axial height H of each end of the insulator 2 is not less than the wall thickness W1 of the insulator 2 within the stator slot 12, which is convenient for the injection molding of the ends of the insulator 2.

[0034] In one example, the adjacent ends of the insulator 2 are connected circumferentially, so that the insulators 2 are connected to form a whole through the ends, further improving the bonding strength between the insulator 2 and the stator core 1 and preventing the insulator 2 from loosening from the stator core 1 due to vibration during the operation of the motor.

[0035] In one example, please refer to Figure 2 and Figure 5As shown, the stator slot 12 is an open slot, and the thickness L of the insulator 2 corresponding to the slot opening 121 of the stator slot 12 is greater than the wall thickness W1 of the insulator 2 in the stator slot 12, thereby strengthening the structural strength of the insulator 2 located at the slot opening 121 of the stator slot 12, and preventing the insulator 2 from cracking in the portion due to the insulator 2 corresponding to the slot opening 121 of the stator slot 12 being too thin to withstand the influence of the motor vibration during the operation of the motor, thereby affecting the insulation between the conductor 3 and the stator core 1. Of course, in other embodiments, the stator slot 12 may also be set as a closed slot, which is not specifically limited here.

[0036] Furthermore, in order to strengthen the structural strength between the insulator 2 and the stator core 1, the notch 121 of the stator slot 12 is opened in the middle of the slot wall on the side of the stator slot 12 away from the stator yoke 11, so that part of the slot wall is retained on both sides of the notch 121 of the stator slot 12, thereby ensuring the degree of wrapping of the stator slot 12 on the insulator 2 and preventing the insulator 2 from easily falling off from the notch 121 of the stator slot 12.

[0037] In one example, an oil outlet hole 4 is provided between the ports 21 of two adjacent stator slots 12, and the oil outlet hole 4 is located on the end surface of the stator yoke 11. Along the circumferential direction, the oil outlet hole 4 is located in the middle of two adjacent stator slots 12, so that the cooling oil can be evenly sprayed through each oil outlet hole 4 onto the corresponding wire 3 extending from the through hole of the insulator 2, so that the heat of each wire 3 is evenly dissipated.

[0038] For further information, see Figure 1 and Figure 6 As shown, a cooling oil channel 5 is provided inside or on the outer circumferential surface of the stator yoke 11. The cooling oil channel 5 includes a plurality of axial oil channels 51 extending axially therethrough and a circumferential oil channel 52 arranged circumferentially and connected to each axial oil channel 51, wherein one axial oil channel 51 corresponds to between two adjacent stator slots 12, and both ends of the axial oil channel 51 are respectively connected to the oil outlet holes 4 between the corresponding two stator slots 12. The circumferential oil channel 52 is provided with an oil inlet hole (not shown), and the cooling oil flows into the circumferential oil channel 52 through the oil inlet hole, and then flows into each axial oil channel 51 in turn through the circumferential oil channel 52. The cooling oil in each axial oil channel 51 exchanges heat with the insulator 2 through the stator core 1, dissipating the heat of the wire 3 in the insulator 2. Finally, the cooling oil in each axial oil channel 51 is sprayed from the oil outlet holes 4 corresponding to the two ends of the axial oil channel 51 to cool the wire 3 at both ends of the stator core 1. For the specific cooling oil flow direction in this example, please refer to Figure 6 The arrow points to the middle.

[0039] Furthermore, the radial dimension of the axial oil passage 51 is larger than its circumferential dimension.

[0040] It should be noted that the axial direction, radial direction and circumferential direction mentioned in the present application are all the axial direction, radial direction and circumferential direction of the stator yoke 11 .

[0041] The present application also discloses a motor having the stator structure shown above.

[0042] The above is a detailed description of an embodiment of the utility model, but the content is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A stator structure, comprising a stator core, the stator core having a stator yoke and a plurality of stator slots located inside the stator yoke and axially penetrating, each of the stator slots being provided with an insulator in contact with the slot wall, the insulator being provided with an axially penetrating through hole, the through hole being provided with a plurality of conductors, characterized in that: The two ends of the insulator extend out of the stator slots from the two end surfaces of the stator core to form insulator ends. The insulator ends are configured so that the minimum air distance separating the conductor from the end surface of the stator core is greater than the creepage distance.

2. A stator structure according to claim 1, characterized in that: The wall thickness of the insulator in the stator slot is W1, and the thickness of the end portion of the insulator is W2, wherein W1 <W2。 3. A stator structure according to claim 1, characterized in that: Adjacent ends of the insulators are connected along the circumferential direction.

4. A stator structure according to claim 1, characterized in that: The height H of each end of the insulator in the axial direction is not less than the wall thickness W1 of the insulator in the stator slot.

5. A stator structure according to claim 1, characterized in that: The stator slot is an open slot, and the thickness L of the insulator corresponding to the slot opening of the stator slot is greater than the wall thickness W1 of the slot wall portion of the insulator in the stator slot.

6. A stator structure according to any one of claims 1 to 5, characterized in that: An oil outlet hole is correspondingly provided between two adjacent stator slot ports, and the oil outlet hole is located on the end surface of the stator yoke.

7. A stator structure according to claim 6, characterized in that: A cooling oil channel is provided on the stator yoke, and the cooling oil channel includes a plurality of axial oil channels penetrating in the axial direction and a circumferential oil channel arranged in the circumferential direction and connected with each of the axial oil channels. The axial oil channel is connected to the oil outlet hole, and the circumferential oil channel is provided with an oil inlet hole.

8. A stator structure according to claim 7, characterized in that: The radial dimension of the axial oil passage is greater than the circumferential dimension.

9. A stator structure according to claim 1, characterized in that: The wire is a flat wire.

10. A motor, characterized in that: Comprising the stator structure according to any one of claims 1 to 9.

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