Stator assembly for external rotor motor and liquid cooling motor

Abstract

The utility model relates to the technical field of outer rotor motors, in particular to a stator assembly for an outer rotor motor and a liquid-cooled motor, the stator assembly comprises a support and an iron core, the support comprises an outer ring, an inner ring and a connecting rib located between the outer ring and the inner ring, a first heat dissipation groove is formed in the left side of the outer ring, and a second heat dissipation groove is formed in the right side of the outer ring; each first heat dissipation groove is communicated with the two second heat dissipation grooves on the opposite side, and the left side and the right side of the outer ring are connected with annular glands covering the first heat dissipation grooves and the second heat dissipation grooves in a sealed mode respectively. The inner side of the outer ring is provided with a stator refrigerant inlet hole and a stator refrigerant outlet hole which are communicated with the first heat dissipation groove or the second heat dissipation groove, and the stator refrigerant inlet hole and the stator refrigerant outlet hole are symmetrically arranged; and the iron core sleeves the outer side of the outer ring. Compared with the prior art, the total weight of the motor can be effectively reduced while good heat dissipation efficiency is guaranteed, and the motor is high in practicability and has good market popularization prospects.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of outer rotor motors, in particular to a stator assembly for an outer rotor motor and a liquid-cooled motor. BACKGROUND

[0002] The motor can be divided into two categories of inner rotor motor and outer rotor motor in terms of structural form, the rotor of the inner rotor motor is located inside the stator, the inner rotor motor is small in size and saves assembly space, and the outer rotor motor is just the opposite, the rotor of the outer rotor motor is located outside the stator, the outer rotor motor usually has a large outer diameter and has higher stability.

[0003] Most conventional new energy vehicles use middle-mounted motors (inner rotor motors), the stator core and coil are arranged on the periphery, and the water cooling heat dissipation is only realized by adding a water jacket outside to form a water circulation. The outer rotor motor is equivalent to the shell rotating, the stator core and coil are arranged inside, and the space is relatively small, and it is relatively difficult to arrange the water circulation inside, and the water pipe is relatively complex to lead out. This is one of the reasons why the outer rotor motor is rarely used in new energy vehicles at present.

[0004] In addition, most two-wheeled electric vehicles on the market use hub direct-drive motors, that is, outer rotor motors. With the development of society and the increase of power, heat dissipation is also a problem in the industry.

[0005] At present, some enterprises make the stator support into the shape of a water tank or a bucket, and the heat dissipation can be realized by adding water circulation, but the under-spring mass is too heavy, which will affect the performance of the whole vehicle. SUMMARY

[0006] The purpose of the application is to provide a stator assembly for an outer rotor motor to solve the problems in the background art.

[0007] The technical scheme of the embodiment of the application is as follows:

[0008] The embodiment of the application provides a stator assembly for an outer rotor motor, which comprises a support and a core, the support comprises an outer ring, an inner ring and a connecting rib between the outer ring and the inner ring, a first heat dissipation groove is arranged on the left side of the outer ring, a second heat dissipation groove is arranged on the right side of the outer ring, each first heat dissipation groove is connected with two second heat dissipation grooves on the opposite side, and annular glands covering the first heat dissipation groove and the second heat dissipation groove are sealingly connected to the left and right sides of the outer ring respectively; a stator coolant inlet hole and a stator coolant outlet hole connected with the first heat dissipation groove or the second heat dissipation groove are arranged on the inner side of the outer ring, and the stator coolant inlet hole and the stator coolant outlet hole are symmetrically arranged; and the core is sleeved on the outer side of the outer ring.

[0009] As a preferred scheme of the embodiment, a plurality of screw holes are arranged on the left and right sides of the outer ring, the screw holes are located between adjacent first heat dissipation grooves and between adjacent second heat dissipation grooves, the annular grommet is fixedly connected with the outer ring through fastening screws, and a sealing component is arranged between the annular grommet and the outer ring for sealing, the sealing component being sealing glue or a sealing ring.

[0010] As a preferred scheme of the embodiment, the outer diameter of the annular grommet is greater than the outer diameter of the outer ring, and the edge of the annular grommet protrudes beyond the outer ring to form a limiting baffle on the left and right sides of the iron core.

[0011] As a preferred scheme of the embodiment, the sum of the depths of the first heat dissipation grooves and the second heat dissipation grooves is greater than or equal to the thickness of the outer ring.

[0012] As a preferred scheme of the embodiment, the first heat dissipation grooves and the second heat dissipation grooves are arc-shaped structures.

[0013] As a preferred scheme of the embodiment, the inner ring is fixedly connected with a support shaft, a bearing inner sleeve is arranged on the support shaft, a shaft sleeve refrigerant inlet and a shaft sleeve refrigerant outlet are arranged on the bearing inner sleeve, and the shaft sleeve refrigerant inlet is connected in communication with the stator refrigerant outlet through a pipeline.

[0014] The stator assembly for the outer rotor motor provided in the embodiment has the following beneficial effects:

[0015] 1. The S-shaped refrigerant flow channel composed of the first heat dissipation grooves and the second heat dissipation grooves is arranged on the outer ring and close to the yoke part and the coil of the iron core, so that the heat generated by the iron core and the coil is directly conducted to the refrigerant flow channel, the cooling efficiency is effectively improved, the first heat dissipation grooves and the second heat dissipation grooves adopt a double-passage design, the sealing is strict, and various fluids such as water, alcohol, oil and cooling fluid can be used for heat dissipation.

[0016] 2. Compared with the prior art, the heat dissipation grooves are arranged on the outer ring of the support in the design manner of the barrel-shaped cooling mechanism on the outer side of the support, the total weight of the motor is effectively reduced, the energy consumption of the vehicle is reduced, the heat dissipation grooves adopt a semi-open structure, the interior is convenient to clean and prevent from being blocked, and the later maintenance is convenient.

[0017] 3. The support structure can be CNC machined, die cast and precision cast, is suitable for industrialized batch production, reduces the cost of raw materials, and is widely suitable for various types of motors. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a front view of the stator assembly for the outer rotor motor in the embodiment;

[0019] Figure 2 It is a left view of the stator assembly for the outer rotor motor in the embodiment;

[0020] Figure 3It is a right view of the stator assembly for the outer rotor motor in the embodiment;

[0021] Figure 4 It is a perspective view of the stator assembly for the outer rotor motor in the embodiment;

[0022] Figure 5 It is Figure 4 The structure schematic diagram after the support shaft is removed in the embodiment;

[0023] Figure 6 It is Figure 5 The structure schematic diagram after the annular cover is removed in the embodiment;

[0024] Figure 7 It is Figure 5 The structure schematic diagram after the iron core is removed in the embodiment.

[0025] Main element symbol explanation:

[0026] 11-outer ring, 12-inner ring, 13-connecting rib, 14-second heat dissipation groove, 15-annular cover, 16-screw hole, 17-stator refrigerant inlet hole, 18-support shaft, 181-bearing inner sleeve, 182-shaft sleeve refrigerant outlet hole, 20-iron core. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] Please refer to Figures 1-7 The present embodiment discloses a stator assembly for an outer rotor motor, comprising a support and an iron core 20, the support is of an integrated structure.

[0029] The support comprises an outer ring 11, an inner ring 12 and a connecting rib 13 between the outer ring 11 and the inner ring 12.

[0030] The left side of the outer ring 11 is provided with a first heat dissipation groove, and the right side of the outer ring 11 is provided with a second heat dissipation groove 14. Both the first heat dissipation groove and the second heat dissipation groove 14 are of an arc structure. The first heat dissipation groove and the second heat dissipation groove 14 are arranged in space staggered. Specifically, each first heat dissipation groove is in communication with two second heat dissipation grooves 14 on the opposite side, and similarly, each second heat dissipation groove 14 is in communication with two first heat dissipation grooves 14 on the opposite side. In the present embodiment, the depth of the first heat dissipation groove and the second heat dissipation groove 14 is 1 / 2 of the thickness of the outer ring 11.

[0031] The left and right sides of the outer ring 11 are respectively sealingly connected with annular gaskets 15 covering the first and second heat dissipation grooves 14, and the connection mode of the annular gaskets 15 with the outer ring 11 is specifically as follows: a plurality of screw holes 16 are arranged on the left and right sides of the outer ring 11, the screw holes 16 are located between adjacent first heat dissipation grooves and between adjacent second heat dissipation grooves 14, the annular gaskets 15 are fixedly connected with the outer ring 11 through fastening screws, and a sealing component is arranged between the annular gaskets 15 and the outer ring 11 for sealing, and the sealing component in the embodiment adopts sealing glue; the inner side of the outer ring 11 is provided with a stator refrigerant inlet hole 17 and a stator refrigerant outlet hole in communication with the first and second heat dissipation grooves 14, and the stator refrigerant inlet hole 17 and the stator refrigerant outlet hole are symmetrically arranged.

[0032] The inner ring 12 is fixedly connected with a support shaft 18, a bearing inner sleeve 181 is arranged on the support shaft 18, a shaft sleeve refrigerant inlet (not shown in the figure) and a shaft sleeve refrigerant outlet hole 182 are arranged on the bearing inner sleeve 181, and the shaft sleeve refrigerant inlet is connected with the stator refrigerant outlet hole through a pipeline.

[0033] The iron core 20 is sleeved on the outer side of the outer ring 11, and in the embodiment, the outer diameter of the annular gasket 15 is greater than the outer diameter of the outer ring 11, and the edge of the annular gasket 15 protrudes beyond the outer ring 11 to form a limiting baffle on the left and right sides of the iron core 20.

[0034] When the motor continuously works, the coil wound on the iron core generates heat, the heat is concentrated on the yoke part (the position close to the outer ring) of the iron core, the external refrigerant enters the flow channel composed of the first and second heat dissipation grooves 14 through the stator refrigerant inlet hole 17, exchanges heat at the position closest to the yoke part of the iron core, carries away the heat, and cools the coil and the iron core, enters the shaft sleeve refrigerant inlet through the stator refrigerant outlet hole and the pipeline, and then cools the bearing on the bearing inner sleeve 181 in the bearing inner sleeve 181, and finally enters the circulating loop from the shaft sleeve refrigerant outlet hole 182.

[0035] As another embodiment of the embodiment, a liquid-cooled motor includes a stator and a rotor located outside the stator, and the stator adopts the stator assembly of the outer rotor motor described above, and the liquid-cooled motor can be used as a power driving source of a two-wheeled electric vehicle, a new energy vehicle or the like.

[0036] It should be noted that "first", "second" and the like are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence.

[0037] The above is only a preferred embodiment of the present application, and is not used to limit the protection scope of the present application.

Claims

1. A stator assembly for an external rotor electric machine comprising a bracket and a core, the bracket comprising an outer ring, an inner ring and connecting webs between the outer ring and the inner ring, characterized in that, The left side of the outer ring is provided with first heat dissipation grooves, and the right side of the outer ring is provided with second heat dissipation grooves, each first heat dissipation groove is communicated with two second heat dissipation grooves on the opposite side, and the left and right sides of the outer ring are respectively sealingly connected with annular glands covering the first heat dissipation grooves and the second heat dissipation grooves; the inner side of the outer ring is provided with a stator coolant inlet hole and a stator coolant outlet hole communicated with the first heat dissipation grooves or the second heat dissipation grooves, and the stator coolant inlet hole and the stator coolant outlet hole are symmetrically arranged; the iron core sleeve is arranged on the outer side of the outer ring.

2. The stator assembly for an external rotor electric motor of claim 1, wherein, A plurality of screw holes are arranged on the left and right sides of the outer ring, the screw holes are located between adjacent first heat dissipation grooves and between adjacent second heat dissipation grooves, the annular glands are fixedly connected with the outer ring through fastening screws, sealing components are arranged between the annular glands and the outer ring for sealing, and the sealing components are sealing glue or sealing rings.

3. The stator assembly for an external rotor electric motor of claim 1, wherein, The outer diameter of the annular gland is greater than the outer diameter of the outer ring, the edge of the annular gland protrudes beyond the outer ring and forms a limiting flange on the left and right sides of the iron core.

4. The stator assembly for an external rotor electric motor of claim 1, wherein, The depth sum of the first heat dissipation grooves and the second heat dissipation grooves is greater than or equal to the thickness of the outer ring.

5. The stator assembly for an external rotor electric motor of claim 1, wherein, The first heat dissipation grooves and the second heat dissipation grooves are arc-shaped structures.

6. The stator assembly for an external rotor electric motor of claim 1, wherein, The inner ring is fixedly connected with a support shaft, a bearing inner sleeve is arranged on the support shaft, a shaft sleeve coolant inlet and a shaft sleeve coolant outlet hole are arranged on the bearing inner sleeve, and the shaft sleeve coolant inlet is communicated with the stator coolant outlet hole through a pipeline.

7. A liquid-cooled electric machine comprising a stator and a rotor located outside the stator, characterized in that, The stator is the stator assembly for the outer rotor motor according to any one of claims 1-6.

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