CN210867380U - Electric machine - Google Patents

Abstract

The utility model relates to a motor, including stator and motor casing, the stator is accepted in the motor casing, its characterized in that be provided with cooling structure in the motor, cooling structure includes: a first cooling channel formed in the stator; a second cooling channel formed in the machine housing and a cooling conduit located between the machine housing and the stator and in fluid communication with the first cooling channel and the second cooling channel, the stator, the machine housing, and the cooling conduit being integrated into a single piece. According to the utility model discloses a whole quality of motor alleviates, has increased the power density of whole equipment, has improved the whole efficiency of equipment, and greatly reduced the heat loss of equipment, has saved the complicated assembling process of traditional motor stator with casing interference pressure equipment.

Description

Electric machine

Technical Field

The utility model relates to a motor field, in particular to motor including integrated form stator structure.

Background

With the continuous development of the motor industry, motor manufacturing enterprises continuously pursue small volume and high power density, more and more materials with high electromagnetic load and thermal load are adopted in the motor design, the loss generated during the operation of the motor is increased, the integral temperature rise or the local temperature rise of the motor is caused to be overhigh, the service life of the motor can be reduced, and the economic and technical indexes of the motor such as the efficiency and the like can be influenced. In particular, the heat released by the rotor inside the stator is concentrated in a large amount inside the casing and is difficult to transport out.

In view of the above problems, many motors have been disclosed in the prior art to improve the heat dissipation of the motor. However, the conventional motor usually adopts a traditional heat dissipation rib or air cooling mode to dissipate heat of the motor, so that the effectiveness is low, and the heat loss of the equipment is high.

For example, fig. 1 and 2 show a conventional motor structure in an exploded view and a partially cut-away perspective view, the motor includes a rotor, a stator, and a housing made of a metal material, the housing is provided with heat dissipating ribs on an outer surface thereof, and the stator and the housing are fixed together by interference press-fitting. However, such motors have a relatively high overall weight and low power density due to the fact that the housing is made of a metallic material, and involve complicated casting of the metal shell of the motor housing and complicated assembly processes between the stator and the housing. In addition, efficient ground heat conduction cannot be achieved through the heat dissipation ribs.

Accordingly, there is a need for a new motor construction that overcomes one or more of the problems set forth above and/or other deficiencies in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a based on such background and provide, and its aim at provides a neotype motor for can improve the heat dissipation problem of motor effectively on the one hand, and on the other hand can alleviate the whole quality of motor, and the assembling process of easy motor.

According to a first aspect of the present invention, it relates to an electric machine comprising a stator and a machine housing, the stator being received in the machine housing, wherein a cooling structure is provided in the electric machine, the cooling structure comprising: a first cooling channel formed in the stator; a second cooling channel formed in the machine housing and a cooling conduit located between the machine housing and the stator and in fluid communication with the first cooling channel and the second cooling channel, the stator, the machine housing, and the cooling conduit being integrated into a single piece.

Advantageously, the first cooling channel comprises: the axial holes are arranged in the stator and are uniformly distributed in a circular manner around the axis of the stator; and a plurality of radial holes provided in a circumferential direction on an annular outer surface of the stator, each of the radial holes intersecting with a corresponding one of the axial holes to communicate with each other.

Advantageously, the stator is provided with two rows of said radial holes, the cooling circuit comprising respectively two annular circuits and a plurality of branches extending radially inwards from each annular circuit, each of said branches being in fluid communication with a respective radial hole of the stator. The two ring lines are connected to each other by a support.

Advantageously, the second cooling channel comprises a cooling fluid inlet and a cooling fluid outlet, a first orifice communicating with the cooling fluid inlet is provided on a first of the two annular pipes, a second orifice communicating with the cooling fluid outlet is provided on a second of the two annular pipes, and the cooling fluid can flow into the first annular pipe through the cooling fluid inlet on the motor housing and into the first row of radial holes through a plurality of branches on the first annular pipe, and further into the axial holes in the stator for cooling, and then flow out to the second annular pipe through the second row of radial holes and a plurality of branches on the second annular pipe to flow out to the cooling fluid circulation device through the cooling fluid outlet.

Advantageously, the coolant circulation device comprises a coolant tank fixed to the motor housing.

Advantageously, the stator and the cooling line are welded together, and the welded stator and the cooling line are integrally injection-molded as a single piece with the motor housing made of a thermosetting material. A plurality of axial grooves are uniformly arranged on the annular inner surface of the motor shell at intervals.

Advantageously, the motor further comprises a rotor, a rotor shaft and an end cap, the rotor shaft having a first end received in a shaft end location slot of the motor housing by a first bearing and another end received in and protruding from a central opening of the end cap via a second bearing to output power. The end cap is coupled to the motor housing by a bolt.

Adopt the basis the utility model discloses a motor for the whole quality of motor alleviates, has increased the power density of whole equipment, has improved the whole efficiency of equipment. Because the traditional heat dissipation ribs or the conventional air cooling are replaced by the strong cold water path cooling, the heat loss of the equipment is greatly reduced. In addition, the injection molding process is utilized to integrate the stator structure and the motor shell into a whole, so that the complex assembling process of interference press fitting of the traditional stator and the motor shell is omitted.

Drawings

The above and other features and advantages of the present invention will become more readily understood from the following description with reference to the accompanying drawings, in which:

fig. 1 is an exploded view of a conventional motor structure;

fig. 2 is a partially cut-away perspective view of a conventional motor structure;

fig. 3 is an exploded view of an electric machine according to an embodiment of the present invention;

fig. 4 is a partially cut-away perspective view of an electric machine according to an embodiment of the invention; and

fig. 5 is a schematic view of an assembly process of the stator and motor housing shown in fig. 3 and 4.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The following description of the present invention may be used in conjunction with any orientation, such as "inner", "outer", "circumferential", "axial", "radial", etc., unless explicitly stated otherwise, and is for convenience only and is not intended to limit the scope of the invention in any way.

In view of the deficiencies of the prior art motor structure as shown in fig. 1 and 2 mentioned in the background section, a new motor structure is proposed, as shown in fig. 3 and 4 in an exploded view and a partially cut-away perspective view, a motor according to a specific embodiment of the present invention.

The structure of the exemplary motor 1 will now be described in detail with reference to fig. 3 and 4.

Similar to the conventional electric machine shown in fig. 1 and 2, the electric machine 1 in fig. 3 and 4 likewise comprises a stator 2, a rotor 3 and a motor housing 4, the stator 2 being received within the motor housing 4, the rotor 3 being received within a central opening 6 of the stator 2 and being interference fit over a rotor shaft 7 for rotation relative to the stator 2 about the rotor shaft 7. A first end of the rotor shaft 7 is received in a shaft end positioning groove 10 of the motor housing through a first bearing 8 and the other end is received in a central opening 12 of an end cover 5 coupled with the motor housing 4 via a second bearing 9, and protrudes from the central opening 12 to output power. Referring particularly to fig. 3, the end cap 5 is fixed to the motor housing 4 by fastening means such as bolts 11. However, it should be understood that any other means suitable for fastening known in the art also falls within the scope of the claimed invention.

It should be noted that, different from the traditional motor structure, the motor 1 according to the embodiment of the present invention is provided with a cooling pipeline, which can be welded and fixed on the annular outer surface of the stator 2, so as to replace the metal heat dissipation rib or the air cooling system in the traditional structure. By adopting the strong-cooling water path, the heat dissipation problem of the motor can be effectively improved, and the heat loss of equipment is greatly reduced.

Specifically, as shown in fig. 3, the cooling circuit comprises two annular circuits 14 connected together by a support 13 and a plurality of branches 20 extending radially inwards from each annular circuit 14, each branch 20 being in communication with a respective radial hole of two rows of radial holes 15 respectively made on the annular outer surface of the stator, the two rows of radial holes 15 being in communication with each other through a plurality of axial holes 16 provided inside the stator (see fig. 4). A first orifice is provided in the first annular conduit in fluid communication with the coolant inlet 17 and a second orifice is provided in the second annular conduit in fluid communication with the coolant outlet 18, and coolant is able to flow into the first annular conduit via the coolant inlet 17 in the motor housing 4 and into the first row of radial holes via the plurality of branches 20 in the first annular conduit, into the axial holes 16 in the stator 2 for cooling, and then out to the second annular conduit via the second row of radial holes and the corresponding plurality of branches 20 in the second annular conduit to flow out to a coolant circulation device (not shown) via the coolant outlet 18. The coolant circulation means preferably comprises a coolant reservoir (e.g. a coolant tank) fixed to the motor housing 4. Or, according to the actual use requirement, the cooling water channel welded on the stator structure can be connected to the cooling water tank by using an external cooling pipeline.

However, it will be appreciated that more than two annular ducts and corresponding rows of radial holes may be provided, depending on the heat dissipation requirements for the machine or the heat losses desired by the user.

In addition, in order to lighten the whole quality of motor and to facilitate the assembly process of whole motor element as far as possible, the utility model discloses a motor casing 4 made through thermosetting material, this motor casing 4 and the cooling pipeline and the stator 2 that are made by metal material are moulded plastics into an organic whole. Advantageously, a plurality of axial grooves 19 are provided on the annular inner surface of the motor housing 4 at circumferentially spaced intervals to meet the injection molding process requirements for thermosetting materials, such as minimum wall thickness, mold filling, etc., and to minimize molding defects.

Next, the manufacturing and assembling process of the integrated stator structure of the whole motor will be explained with reference to fig. 5.

The assembly incorporating the stator 2, the cooling circuit and the motor housing 4 is produced and assembled successively by the following steps:

step 100: drilling a plurality of through axial holes 16 at the end of the conventionally manufactured stator 2, the axial holes 16 being evenly distributed in a circular shape as viewed from the end face of the stator 2;

step 200: two circles of radial holes 15 are machined in the circumferential direction on the annular outer surface of the stator 2 so that the radial holes and the axial holes 16 intersect to communicate with each other;

step 300: sealing both ends of the axial bore 16 at both end faces of the stator 2 with a suitable sealant known in the art;

step 400: welding the stators at two ends of the sealed axial hole with the cooling pipeline;

step 500: the stator and cooling lines welded together are injection-moulded integrally with the motor housing 4 made of thermosetting material, while ensuring that the cooling fluid inlet 17 is in fluid communication with a first aperture in a first one of the annular lines and the cooling fluid outlet 18 is in fluid communication with a second aperture in a second one of the annular lines, to achieve a circulating flow of cooling fluid within the stator structure.

Finally, the formed integrated stator structure is assembled with the rotor and end caps into the desired motor. According to the utility model discloses a motor has not only increased the power density of whole equipment, has improved whole efficiency, the greatly reduced heat loss of equipment, has still saved the complicated assembling process of traditional motor stator with casing interference pressure equipment.

It should be noted that the above-described embodiments should be regarded as merely exemplary, and the present invention is not limited to these embodiments. Upon consideration of the present specification, those skilled in the art can make various changes and modifications without departing from the scope or spirit of the present invention. The true scope of the invention is defined by the following claims and their equivalents.

Claims (10)

1. An electric machine comprising a stator and a machine housing, the stator being received within the machine housing, wherein a cooling structure is provided within the electric machine, the cooling structure comprising: a first cooling channel formed in the stator; a second cooling channel formed in the machine housing and a cooling conduit located between the machine housing and the stator and in fluid communication with the first cooling channel and the second cooling channel, the stator, the machine housing, and the cooling conduit being integrated into a single piece.

2. The electric machine of claim 1, wherein the first cooling channel comprises: the axial holes are arranged in the stator and are uniformly distributed in a circular manner around the axis of the stator; and a plurality of radial holes provided in a circumferential direction on an annular outer surface of the stator, each of the radial holes intersecting with a corresponding one of the axial holes to communicate with each other.

3. An electric machine according to claim 2, wherein the stator is provided with two rows of said radial holes, the cooling circuit respectively comprising two annular circuits and a plurality of branches extending radially inwards from each annular circuit, each of said branches being in fluid communication with a respective radial hole of the stator respectively.

4. An electric machine according to claim 3, characterized in that the two ring conduits are connected to each other by means of a support.

5. The electric machine of claim 4 wherein the second cooling channel includes a coolant inlet and a coolant outlet, a first of the two annular conduits having a first port disposed therein in communication with the coolant inlet, a second of the two annular conduits having a second port disposed therein in communication with the coolant outlet, the coolant being capable of flowing through the coolant inlet in the machine housing into the first annular conduit and through the plurality of branches in the first annular conduit into the first row of radial holes and thence into the axial holes in the stator for cooling, and then through the second row of radial holes and the plurality of branches in the second annular conduit out into the second annular conduit for flowing through the coolant outlet into the coolant circulation device.

6. The electric machine of claim 5 wherein said coolant circulation means comprises a coolant tank secured to said machine housing.

7. An electric machine as claimed in any of claims 1 to 6, wherein the stator and the cooling line are welded together, the welded-together stator and cooling line being injection moulded integrally as a single piece with a machine housing made of a thermosetting material.

8. The electric machine of claim 7 wherein a plurality of axial grooves are uniformly spaced on the annular inner surface of the machine housing.

9. The electric machine of any one of claims 1 to 6, further comprising a rotor, a rotor shaft, and an end cap, the rotor shaft having a first end received by a first bearing in a shaft end location slot of the machine housing and another end received via a second bearing in and protruding from a central opening of the end cap to output power.

10. The electric machine of claim 9, wherein the end cap is coupled to the machine housing by a bolt.

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