CN222464255U - Stator structure and motor - Google Patents

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 core, wherein the stator core has a stator yoke and a plurality of stator slots located inside the stator yoke and axially penetrated, wherein each stator slot is provided with an insulator fitted with its slot wall, wherein an axially penetrated through hole is provided in the insulator, wherein a plurality of wires are penetrated in the through hole, wherein two ends of the insulator extend out of the stator slots from two end surfaces of the stator core respectively to form insulator ends, wherein the insulator ends are configured such that the minimum air distance separating the wire from the end surface of the stator core is greater than the creepage distance, thereby ensuring the insulation between the wire and the end surface of the stator core, and avoiding safety problems such as motor short circuit and leakage caused by too small a creepage distance between the wire and the end surface of the stator core.

Description

Stator structure and motor

Technical Field

The utility model relates to the technical field of motors, in particular to a stator structure and a motor.

Background

Along with the continuous promotion of the voltage platform of the electric drive system, the electric drive system has higher and higher requirements on the insulation performance and the heat dissipation performance of the motor, and most of drive motors on the market have stator slots which are mainly wrapped with wires through insulation paper, and then gaps between the insulation paper and the walls of the stator slots and gaps between the insulation paper and the wires are filled through paint drops. However, the existence of bubbles during paint dripping and the filling rate cannot be hundred percent are quite unfavorable for the heat transfer of the wires to the stator core through the insulating paper.

At present, although some motors with insulating materials molded in stator slots to form insulators to replace insulating paper to separate stator cores from wires are also appeared in the market, the heat dissipation effect of the type of motors is still not ideal, and the insulators are only arranged in the stator slots, so that the creepage distance between the wires and the end faces of the stator cores is too short, and when the motor bears high voltage, the wires and the end faces of the stator cores are easy to conduct electricity, so that safety problems such as short circuit and electric leakage of the motor are caused.

Disclosure of utility model

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a stator structure and a motor, which are used for solving at least one of the problems of poor heat dissipation effect of the motor and too short creepage distance between a wire and the end face of a stator core in the prior art.

The aim of the utility model can be achieved by the following technical scheme:

In a first aspect, the present utility model provides a stator structure, where the stator core has a stator yoke and a plurality of stator slots that are located inside the stator yoke and are penetrated in an axial direction, an insulator that is attached to a slot wall of the stator slot is disposed in each stator slot, a through hole that is penetrated in an axial direction is disposed in the insulator, a plurality of wires are penetrated in the through hole, two ends of the insulator extend out of the stator slots from two end surfaces of the stator core respectively to form insulator ends, and a minimum air distance between the wires and the end surfaces of the stator core is configured to be greater than a creepage distance.

In one embodiment of the utility model the insulator in the stator slot has a wall thickness W1 and the insulator end has a thickness W2, wherein W1< W2.

In one embodiment of the utility model, adjacent insulator ends are circumferentially connected.

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

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 of the insulator in the stator slot.

In one embodiment of the utility model, an oil outlet is correspondingly arranged between two adjacent stator slot ports, and the oil outlet is positioned on the end face of the stator yoke.

In one embodiment of the utility model, the stator yoke is provided with a cooling oil duct, the cooling oil duct comprises a plurality of axial oil ducts penetrating along the axial direction and a circumferential oil duct which is arranged along the circumferential direction and communicated with each axial oil duct, the axial oil duct is communicated with the oil outlet, and the circumferential oil duct is provided with an oil inlet.

In one embodiment of the utility model, the axial oil passage has a radial dimension that is greater than a circumferential dimension.

In one embodiment of the utility model, the wire is a flat wire.

In a second aspect, the present utility model provides an electrical machine comprising a stator structure as described above.

The above-described one or more embodiments of the present utility model have at least one or more of the following advantages:

1. According to the application, the insulator end parts are formed by extending the stator grooves from the two end surfaces of the stator core respectively, so that the insulator end parts are configured to enable the minimum air distance for separating the lead from the end surface of the stator core to be larger than the creepage distance, the insulativity between the lead and the end surface of the stator core is ensured, and the safety problems of short circuit, electric leakage and the like of the motor caused by the fact that the creepage distance between the lead and the end surface of the stator core is too small are avoided.

2. According to the application, the axial oil channels are arranged between two adjacent stator grooves, and the heat conductivity of the wire is improved by matching with the insulator arranged in the stator grooves, so that the heat dissipation effect of the wire is greatly improved.

Drawings

The utility model is further described below with reference to the accompanying drawings.

FIG. 1 is a diagram of a stator structure assembly in accordance with one embodiment of the present utility model;

FIG. 2 is an enlarged cut-away view of a stator slot in accordance with one embodiment of the present utility model;

FIG. 3 is an enlarged view of the structure at A in FIG. 1;

FIG. 4 is an axial cut-away view of a stator structure in accordance with an embodiment of the present utility model;

FIG. 5 is an enlarged view of the structure at B in FIG. 4;

fig. 6 is a schematic view showing a development structure of the cooling oil passage according to an embodiment of the present utility model.

Reference numerals illustrate:

1. The stator comprises a stator core, 11 parts of a stator yoke, 12 parts of a stator slot, 121 parts of a notch, 2 parts of an insulator, 21 parts of a port, 3 parts of a wire, 4 parts of an oil outlet, 5 parts of a cooling oil duct, 51 parts of an axial oil duct, 52 parts of a circumferential oil duct.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-3, the present application discloses a stator structure, which includes a stator core 1, wherein the stator core 1 has a stator yoke 11 and a plurality of stator slots 12 located inside the stator yoke 11 and penetrating along an axial direction, and the plurality of stator slots 12 are uniformly distributed inside the stator yoke 11 along a circumferential direction at intervals. An insulator 2 is arranged in each stator slot 12, a through hole penetrating axially is arranged in the insulator 2, and a wire 3 can penetrate through the through hole to form a stator winding on the stator core 1. The insulator 2 is formed by adopting an 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 tightly attached to the wall of the stator groove 12, so that the situation that the gap between the insulator 2 and the wall of the stator groove 12 needs to be filled with paint drops is avoided, and the heat transfer between the insulator 2 and the stator core 1 is facilitated. And the gap between the insulator 2 and the wire 3 is smaller than the gap between the insulating paper and the wire 3, so that the slot filling rate of the stator is improved, and the performance of the motor is further improved. In this example, the insulator 2 may be made of a material having good insulation, good thermal conductivity, and good strength, and the specific type of the material is not particularly limited.

In an example, the wire 3 is a flat wire, which is more beneficial to self heat dissipation than a cylindrical wire, so that the overall heat dissipation effect of the motor is improved. Preferably, the wire 3 is a flat copper wire.

The two ends of the insulator 2 extend from two end surfaces of the stator core 1 to form end parts of the insulator 2 respectively, the end parts of the insulator 2 are configured to separate the wires 3 from the end surfaces of the stator core 1, the minimum air distance is larger than the creepage distance, the wires 3 near the end ports 21 of the stator groove 12 and the end surfaces of the stator core 1 are ensured to have enough distance to avoid creepage, namely, the wires 3 after twisting and the end surfaces of the stator core 1 are ensured to have enough electrical distance, and further, the insulating performance of the stator on a high-voltage platform such as an 800V voltage platform is ensured.

In an example, referring to fig. 4 and 5, the wall thickness of the insulator 2 in the stator slot 12 is W1, the thickness of the end of the insulator 2 is W2, where W1< W2, the end of the insulator 2 further has a height H along the axial direction, and 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 in the stator slot 12 is equal to the thickness of the end of the insulator 2W 2, in the present application, W1< W2, the height H of the end of the insulator 2 can be reduced on the premise of satisfying the creepage distance between the wire 3 and the end face of the stator core 1, so that the length of the wire 3 wrapped by the end of the insulator 2 is shorter, and further the length of the wire 3 extending out of the stator core 1 along the axial direction is shortened, the height of the end of the motor is reduced, the axial dimension of the motor can be smaller, and the power density of the motor is improved. And through the size that is greater than W1 with the size setting of W2, make insulator 2 tip be close to one side of stator core 1 can laminate with stator core 1's terminal surface, improve the bonding strength between insulator 2 and the stator core 1.

In one example, considering the injection molding process, the height H of the end portion of each insulator 2 in the axial direction is not smaller than the wall thickness W1 of the insulator 2 in the stator groove 12, facilitating the injection molding of the end portion of the insulator 2.

In an example, the end portions of the adjacent insulators 2 are connected in the circumferential direction, so that the insulators 2 are connected through the end portions to form a whole, the bonding strength between the insulators 2 and the stator core 1 is further improved, and the insulators 2 are prevented from being loosened from the stator core 1 due to the influence of vibration in the operation process of the motor.

In an example, referring to fig. 2 and 5, the stator slot 12 is an open slot, the thickness L of the portion of the insulator 2 corresponding to the slot 121 of the stator slot 12 is greater than the wall thickness W1 of the insulator 2 located in the stator slot 12, so as to strengthen the structural strength of the portion of the insulator 2 located in the slot 121 of the stator slot 12, and avoid that during the operation of the motor, the wall thickness L of the portion of the insulator 2 corresponding to the slot 121 of the stator slot 12 is too thin to bear the influence of vibration of the motor, so that the insulator 2 of the portion is cracked, and the insulation between the wire 3 and the stator core 1 is affected. Indeed, in other embodiments, the stator slot 12 may be configured as a closed slot, which is not specifically limited herein.

Further, in order to enhance the structural strength between the insulator 2 and the stator core 1, the notch 121 of the stator slot 12 is formed in the middle of the slot wall of the side, away from the stator yoke 11, of the stator slot 12, so that part of the slot walls are reserved on both sides of the notch 121 of the stator slot 12, the wrapping degree of the insulator 2 by the stator slot 12 is ensured, and the insulator 2 is prevented from easily falling off from the notch 121 of the stator slot 12.

In an example, an oil outlet 4 is correspondingly disposed between the ports 21 of two adjacent stator slots 12, and the oil outlet 4 is located on the end face of the stator yoke 11, and the oil outlet 4 is located in the middle of two adjacent stator slots 12 along the circumferential direction, so that cooling oil can be uniformly sprayed on the corresponding wires 3 extending from the through holes of the insulator 2 through each oil outlet 4, and heat dissipation of each wire 3 is uniform.

Further, as shown in fig. 1 and 6, a cooling oil duct 5 is formed in the inner or outer circumferential surface of the stator yoke 11, and the cooling oil duct 5 includes a plurality of axial oil ducts 51 penetrating in the axial direction and a circumferential oil duct 52 disposed in the circumferential direction and communicating with each axial oil duct 51, wherein one axial oil duct 51 corresponds between two adjacent stator slots 12, and two ends of the axial oil duct 51 are respectively communicated with the oil outlet 4 between the two corresponding stator slots 12. The circumferential oil passage 52 is provided with oil inlet holes (not shown), cooling oil flows into the circumferential oil passage 52 through the oil inlet holes, then flows into the axial oil passages 51 sequentially through the circumferential oil passage 52, the cooling oil in each axial oil passage 51 exchanges heat with the insulator 2 through the stator core 1, the wires 3 in the insulator 2 are radiated, and finally the cooling oil in each axial oil passage 51 is sprayed onto the wires 3 at the two ends of the stator core 1 from the oil outlet holes 4 corresponding to the two ends of the axial oil passage 51 respectively to cool the wires. The specific cooling oil flow direction in this example may be indicated with reference to the arrows in fig. 6.

Still further, the axial oil passage 51 is larger in radial dimension than in circumferential dimension.

Here, the axial direction, the radial direction, and the circumferential direction which are present in the present application are the axial direction, the radial direction, and the circumferential direction of the stator yoke 11.

The application also discloses a motor which is provided with the stator structure.

The foregoing describes one embodiment of the present utility model in detail, but the description is only a preferred embodiment of the present utility model and should not be construed as limiting the scope of the utility model. All equivalent changes and modifications within the scope of the present utility model are intended to be covered by the present utility model.

Claims (10)

1. The utility model provides a stator structure, includes stator core, stator core has stator yoke and a plurality of being located stator yoke inboard and along the stator groove that the axial is link up, each be equipped with the insulator rather than the cell wall laminating in the stator groove, be equipped with the through-hole that the axial runs through in the insulator, wear to be equipped with a plurality of wires in the through-hole, its characterized in that, the insulator both ends are followed respectively stator core both ends face extends the stator groove forms the insulator tip, the insulator tip is configured to with the minimum air distance that separates between wire and the stator core terminal surface is greater than 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 insulator end portion is W2, where W1< W2.

3. A stator structure in accordance with claim 1 wherein adjacent insulator ends are circumferentially connected.

4. A stator structure according to claim 1, wherein the height H of each of said insulator ends in the axial direction is not less than the wall thickness W1 of said insulator in said stator slot.

5. A stator structure according to claim 1, wherein said stator slot is an open slot, and a thickness L of a portion of said insulator corresponding to a slot opening of said stator slot is greater than a wall thickness W1 of a slot wall portion of said insulator in said stator slot.

6. A stator structure according to any one of claims 1 to 5, wherein an oil outlet is provided between two adjacent stator slot ports, and the oil outlet is located on an end face of the stator yoke.

7. The stator structure according to claim 6, wherein the stator yoke is provided with a cooling oil passage, the cooling oil passage includes a plurality of axial oil passages penetrating in an axial direction and a circumferential oil passage disposed in a circumferential direction and communicating with each of the axial oil passages, the axial oil passage communicates with the oil outlet, and the circumferential oil passage is provided with an oil inlet.

8. A stator structure in accordance with claim 7 wherein said axial oil passage has a radial dimension greater than a circumferential dimension.

9. A stator structure according to claim 1, wherein the wires are flat wires.

10. An electric machine comprising a stator structure as claimed in any one of claims 1-9.