WO2020088376A1

WO2020088376A1 - Cooling water channel of external rotor motor and manufacturing method therefor, external rotor motor and cooling system thereof

Info

Publication number: WO2020088376A1
Application number: PCT/CN2019/113453
Authority: WO
Inventors: 万珍平; 陈汉平; 吴柏禧; 席荣盛; 谢培利; 陆龙生; 汤勇
Original assignee: 华南理工大学; 佛山市顺德区金泰德胜电机有限公司
Priority date: 2018-11-02
Filing date: 2019-10-25
Publication date: 2020-05-07
Also published as: CN109510401A

Abstract

A cooling water channel of an external rotor motor, wherein an external rotor motor acted on thereby comprises a stator core, a motor end cover, and an inner casing; the inner casing tightly fits with and is mounted on an inner side of the stator core of the external rotor motor, and the water channel is provided in the inner casing; the water channel is folded back and distributed layer by layer in the axial direction of the external rotor motor, and two ends of the water channel are provided with an axial water intake segment and a water discharge segment; ports of the water intake segment and the water discharge segment are a water inlet and a water outlet, respectively; the water inlet and the water outlet are disposed on the same end of the external rotor motor; the motor end cover of the end at which the water inlet and water outlet are located is provided with a water intake nozzle and a water discharge nozzle that are connected to the water inlet and the water outlet, respectively. The present invention further relates to a method for manufacturing a cooling water channel of an external rotor motor, and an external rotor motor and a cooling system thereof. The present invention relates to the technical field of motor heat control. During the operation of the external rotor motor having the cooling water channel or cooling system, the increase in temperature is small, temperature equalization is good, and temperature control consumes little energy.

Description

Cooling water channel of outer rotor motor and manufacturing method thereof, outer rotor motor and cooling system thereof

Technical field

The invention belongs to the technical field of motor thermal control, and particularly relates to a cooling water channel of an outer rotor motor and a manufacturing method thereof, an outer rotor motor having the cooling water channel and a cooling system thereof.

Background technique

At present, energy shortage and pollution issues are major issues affecting the development of China, and new energy vehicles are an important tool to alleviate these two problems. New energy vehicle motors are an important factor affecting the performance and development of new energy vehicles. In order to meet the requirements of high power density and light weight, the research and development needs of external rotor motors are increasingly strong, but with higher power density requirements, the thermal load per unit volume of external rotor motors is increasing, making the motor produce excessive temperature Liters, resulting in a decline in motor performance and life. Therefore, the research on the temperature control technology of the motor is particularly critical. The water-cooled heat dissipation system has a good heat dissipation effect and is an effective technology to control the temperature rise of the motor. However, the water channel of the water-cooled heat dissipation system does have the disadvantages that the temperature rise is too high or the pressure drop is too large.

The cooling channel structure of the water-cooled motor mainly has two types of spiral type and fold-back type. Although the spiral water channel structure has a small pressure drop loss, the inlet and outlet of the water channel are distributed at the front and rear ends of the motor, resulting in a large temperature gradient at the front and rear ends of the motor, which is not conducive to the overall temperature rise of the motor control. Although the configuration of the fold-back water channel structure is relatively flexible, the existing fold-back water channel structure is not reasonable enough; the temperature uniformity of the motor cannot be well guaranteed, nor is it convenient for the layout of the overall water cooling system; More times, there is a problem of greater pressure drop, and more energy consumption is required.

technical problem

In order to meet the requirements of high power density and light weight, the research and development needs of external rotor motors are increasingly strong, but with higher power density requirements, the thermal load per unit volume of external rotor motors is increasing, making the motor produce excessive temperature Liters, resulting in a decline in motor performance and life. The water channel of the water-cooled heat dissipation system does have the disadvantages that the temperature rise is too high or the pressure drop is too large. The cooling channel structure of the water-cooled motor mainly has two types of spiral type and fold-back type. Although the spiral water channel structure has a small pressure drop loss, the inlet and outlet of the water channel are distributed at the front and rear ends of the motor, resulting in a large temperature gradient at the front and rear ends of the motor, which is not conducive to the overall temperature rise of the motor control. Although the configuration of the fold-back water channel structure is relatively flexible, the existing fold-back water channel structure is not reasonable enough; the temperature uniformity of the motor cannot be well guaranteed, nor is it convenient for the layout of the overall water cooling system; in addition, the waterway direction needs to be changed More times, there is a problem of greater pressure drop, and more energy consumption is required.

Technical solution

In view of the technical problems in the prior art, the first object of the present invention is to provide a cooling water channel and a cooling system for the outer rotor motor; it can effectively control the temperature rise of the outer rotor motor and ensure the temperature uniformity of the outer rotor motor ; Also provides a method of manufacturing the cooling water channel of the outer rotor motor, so that the heat generated by the outer rotor motor is more efficiently conducted to the cooling medium in the water channel.

Another object of the present invention is to provide an external rotor motor with low temperature rise and low energy consumption required for temperature control.

In order to achieve the above objectives, the present invention adopts the following technical solutions:

The cooling water channel of the outer rotor motor, which acts on the outer rotor motor includes the stator core, the motor end cover, and the inner casing; the inner casing is closely fitted to the inside of the stator core of the outer rotor motor, and the water channel is set in the inner casing ： The water channel is of the fold-back type, distributed along the axial layer of the outer rotor motor. The axial inlet and outlet sections are provided at both ends of the water channel; the ports of the inlet and outlet sections are the inlet and outlet respectively; The water inlet and the water outlet are set at the same end of the outer rotor motor; the water inlet and the water outlet are provided on the motor end cover where the water inlet and the water outlet are located, and are connected to the water inlet and the water outlet respectively. With this structure, the temperature rise of the outer rotor motor can be effectively controlled, and the temperature uniformity of the outer rotor motor can be ensured, which is conducive to the best performance of the outer rotor motor and facilitates the layout of the overall cooling system.

As a preference, the widths of the water channels of adjacent layers are not equal, and the widths of the layers are distributed regularly in terms of "size". After adopting this structure, the cooling water has an inlet effect between each layer of water channels, which improves the degree of turbulence and improves the heat exchange efficiency.

As a preference, the corner of the waterway is a rounded transition; the radius R of the rounded corner is selected according to the width of the waterway; the selection range of R is 10mm≤R≤20mm. After adopting this structure, the cooling water is stably transitioned, the pressure loss is reduced, and the flow dead zone is eliminated.

As a preference, the transition between the junction of the water inlet and the water inlet and the junction of the water outlet and the water outlet are smooth arc transitions. After adopting this structure, the cooling water is stably transitioned, the pressure loss is reduced, and the flow dead zone is eliminated.

As a preference, the number of axial layers N, the width L of the water channel and the height h of the water channel are adjusted according to the stator size of the outer rotor motor; where the selection range of the number of axial layers N is 2≤N≤5, N Take an integer; the selection range of the waterway height h is 6mm≤h≤9mm. After adopting this structure, it can adapt to different types of external rotor motors, and adopt the optimal axial layer number and width to obtain the best heat transfer coefficient and pressure drop loss.

As a preference, the inner casing includes an inner casing body and an inner casing cover; convex grooves are distributed on the inner casing body, the inner casing body and the inner casing cover are fixedly closed into a whole, and the inner casing body The convex groove divides the space formed by the inner casing main body and the inner casing cover into water channels. After adopting this structure, the water channel structure is designed by designing the position of the convex groove on the inner casing, which has a simple structure and is easy to manufacture.

As a preference, the convex groove on the inner casing body is integrated with the inner casing body. After adopting this structure, the inner casing and the convex groove forming the water channel can be integrally formed during manufacturing to avoid contact thermal resistance, so that the heat generated by the outer rotor motor is more efficiently conducted to the cooling medium, and the heat is taken out by the cooling medium .

Beneficial effect

The cooling system of the outer rotor motor includes a water pump, a cooling water tank, and an inner casing containing the cooling water channel of the outer rotor motor; the water passage in the inner casing is connected to the cooling water tank through the water inlet and outlet nozzles on the motor end cover It forms a cooling pipe with circulating cooling water; the water pump is set in the cooling pipe as the power source of cooling water. After adopting this structure, when the outer rotor motor is in operation, the water in the cooling water tank enters the water channel in the inner casing from the water inlet of the water channel, flows through each section of the water channel in turn, and forced convection heat exchange with the inner casing takes away the outside The heat generated during the operation of the rotor motor flows out of the inner casing through the water outlet and returns to the cooling water tank to form a circulation circuit; thus effectively controlling the temperature rise of the outer rotor motor is conducive to the best performance of the outer rotor motor.

The outer rotor motor with the above cooling channel; the temperature rise is small, the temperature control requires less energy consumption, the performance is more stable, and the life is longer.

Manufacturing method of outer rotor motor cooling water channel: the inner casing body and the convex grooves on the inner casing body are integrally formed during manufacture to obtain the inner casing body with convex grooves; after that, the inner casing body and the inner casing cover are welded Closed into a whole inner casing, the top of the convex groove and the inner casing cover are welded together; wherein the inner cavity of the inner casing is divided by the convex groove to obtain a return type water channel, the ends of the return type water channel are not closed, leaving Externally connected water inlet and outlet. After adopting this method, the contact thermal resistance is reduced, so that the heat generated by the outer rotor motor is more efficiently conducted to the cooling medium.

All in all, the cooling channel and cooling system of the outer rotor motor in the present invention have the following advantages: high heat transfer efficiency, low pressure drop loss, can control the temperature rise of the outer rotor motor with a small pressure drop loss, and can guarantee the outer rotor motor The temperature uniformity of the outer rotor motor; the manufacturing method of the cooling water channel of the outer rotor motor can reduce the contact thermal resistance generated during the manufacturing process, so that the heat generated by the outer rotor motor is more efficiently conducted to the cooling medium; with the cooling water channel or cooling system The external rotor motor has a small temperature rise and stable performance, which can meet the requirements of new energy vehicles.

BRIEF DESCRIPTION

FIG. 1 is a schematic diagram of the overall structure of the cooling water channel of the outer rotor motor in the embodiment.

2 is a front view of the main body of the inner casing in the embodiment.

FIG. 3 is a schematic structural diagram of an inner casing and an outer rotor motor in an embodiment.

As shown in the picture:

1-Inner casing main body; 2-Inner casing cover; 3-Water channel; 4-Convex groove; 5 Water inlet; 6-Water outlet; 7-Inner casing whole; 8-Stator core; 9-Outer rotor; L1- the width of the first-layer water channel; L2- the width of the second-layer water channel; L3- the width of the third-layer water channel; h- the height of the water channel; d- the width of the convex groove.

Embodiments of the invention

The present invention will be further described in detail below in conjunction with specific embodiments.

Example one

The cooling channel of the outer rotor motor is set in the inner casing of the outer rotor motor; the inner casing is installed inside the stator core of the outer rotor motor and closely adheres to the stator core.

The inner casing includes the inner casing body and the inner casing cover; the materials of the inner casing body and the inner casing cover are aluminum alloys; the inner casing body is provided with convex grooves, which are integrally formed during manufacture; the inner casing body and The inner casing cover is closed into a whole by welding; the cavity formed by the combination of the inner casing body and the inner casing cover is a water channel structure, that is, the convex groove on the inner casing body connects the inner casing body and the inner casing cover The closed space is divided into water channels of various layers; the ends of the water channel are not closed, and there are water inlets and water outlets communicating with the outside. The water channel structure is a return type, distributed along the axial layer of the outer rotor motor; the axial inlet and outlet sections are provided at both ends of the water channel; the inlet and outlet ports of the inlet and outlet sections are the inlet and outlet, respectively; The corners are rounded transitions, and the radius of the rounded corners is selected according to the width of the waterway; the width of each adjacent two-layer waterway is not equal, and it is regularly distributed in "size".

The water inlet and water outlet of the water channel structure are located at the same end of the motor end cover, and are respectively connected to the water inlet and water outlet of the motor end cover. The transition mode is a smooth arc transition. In this embodiment, the water inlet and the water outlet are on the side of the rear end cover of the outer rotor motor, and are connected to the water inlet and water outlet of the rear end cover.

The number N of the water channel, the width L of the water channel and the height h are adjusted according to the stator size 2 of the outer rotor motor. The axial length of the outer rotor motor of this embodiment is 80 mm, the number N of water channels is 3, the height of the water channel is 8 mm, the width L1 of the first water channel is 25 mm, and the width of the second water channel L2 is 21 mm. The width L3 of the three-layer water channel is 25 mm, which is regularly distributed in "size"; the radius R of the transition fillet at the corner of the water channel is 20 mm, and the corresponding width d of the convex groove is 6 mm.

When passing water for cooling, the cooling water path is as shown in Figure 2. The cooling water flows from the water inlet 5 into the water channel, and then flows through the water inlet section to the left end of the first layer water channel under the guidance of the first layer water channel Flow to the left, around the circumference of the inner casing, reach the right end of the first layer of the channel, turn back into the second layer of water channel around the circumference of the inner casing to the left end of the second layer of the channel, and then turn back into the third layer of water channel Finally, it flows into the outlet section of the channel at the right end of the third-layer channel, and flows out from the outlet 6.

The manufacturing method of the cooling water channel of the outer rotor motor described above: designing a convex groove on the inner casing body, dividing the inner cavity of the inner casing by the convex groove to obtain a fold-back water channel, when the convex grooves on the inner casing body and the inner casing body are manufactured One-piece molding; after obtaining the inner casing body with convex grooves, the inner casing body and the inner casing cover are closed by welding to form an inner casing whole, wherein the top of the convex groove and the inner casing cover are welded together; Both ends of the water channel are not closed, and there are water inlets and water outlets communicating with the outside.

Example 2

External rotor motor, including stator core, motor end cover, and inner casing; the inner casing is provided with the cooling water channel of the outer rotor motor described in the first embodiment; the water inlet and outlet of the motor are provided on the motor end cover The water inlet and outlet are connected to the water inlet and outlet respectively.

External rotor motor cooling system, including a water pump, a cooling water tank, and an inner casing containing the cooling water channel of the outer rotor motor described in the first embodiment; the inner casing is closely fitted and installed on the inner side of the stator core of the outer rotor motor, and its water outlet The water inlet is respectively connected to the water inlet and outlet on the rear end cover of the outer rotor motor, and is connected with the cooling water tank to form a cooling pipe; the water pump is arranged in the cooling pipe. When the outer rotor motor is working, the water pump drives the water in the cooling water tank into the water channel in the inner casing from the water inlet of the water channel, flows through each section of the water channel in turn, and performs forced convection heat exchange with the inner casing to take away the outer rotor motor. The generated heat then flows out of the inner casing through the water outlet and returns to the cooling water tank to form a circulation circuit. In this circulating circuit, the cooling water continuously exchanges heat with the inner casing, taking away the heat generated during the operation of the outer rotor motor, so as to control the temperature rise of the outer rotor motor.

The rest of the unmentioned parts are the same as in the first embodiment.

The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, changes, modifications, substitutions, combinations, The simplifications should all be equivalent replacement methods, which are all included in the protection scope of the present invention.

Claims

The cooling water channel of the outer rotor motor, which acts on the outer rotor motor includes the stator core, the motor end cover, and the inner casing; the inner casing is closely fitted to the inside of the stator core of the outer rotor motor, and the water channel is set in the inner casing ; It is characterized in that: the water channel is a return type, distributed along the axial layer of the outer rotor motor, and the water inlet and outlet sections are provided at both ends of the water channel; the ports of the water inlet and outlet sections are the water inlet, The water inlet; the water inlet and the water outlet are set at the same end of the outer rotor motor; the water inlet and the water outlet are provided on the motor end cover where the water inlet and the water outlet are located, and are connected to the water inlet and the water outlet respectively.
The cooling water channel of the outer rotor motor according to claim 1, characterized in that the widths of the water channels of adjacent layers are not equal, and the widths of the layers are distributed regularly according to "size".
The cooling water channel of the outer rotor motor according to claim 1, wherein the corner of the water channel is a round corner transition; the selection range of the round corner radius R is 10mm≤R≤20mm.
The cooling water channel of an external rotor motor according to claim 1, wherein the transition between the water inlet and the water inlet of the water channel, and the junction between the water outlet and the water outlet are smooth arc transitions.
The cooling water channel of an external rotor motor according to claim 1, wherein the selection range of the axial layer number N of the water channel is 2≤N≤5, N takes an integer; the selection range of the water channel height h is 6mm≤h≤ 9mm.
The cooling water channel of the outer rotor motor according to claim 1, wherein the inner casing includes an inner casing body and an inner casing cover; the inner casing body is distributed with convex grooves, the inner casing body and the inner casing The cover is fixedly connected and closed into a whole, and the convex groove on the inner casing main body divides the space formed by the inner casing main body and the inner casing cover into various layers of water channels.
The cooling water channel of the outer rotor motor according to claim 6, wherein the convex groove on the inner casing body is integrated with the inner casing body.
The cooling system of the outer rotor motor is characterized in that it includes a water pump, a cooling water tank, and an inner casing containing the cooling water passage of the outer rotor motor according to any one of claims 1-7; the water passage in the inner casing passes through the motor end The water inlet nozzle and the water outlet nozzle on the cover are connected with the cooling water tank to form a cooling pipe for circulating cooling water; the water pump is set in the cooling pipe as a power source for cooling water.
The outer rotor motor is characterized by having the cooling water channel of the outer rotor motor according to any one of claims 1-7.
The manufacturing method of the outer rotor motor cooling water channel, characterized in that: manufacturing the outer rotor motor cooling water channel according to claim 6 or 7: the inner casing body and the convex grooves on the inner casing body are integrally formed at the time of manufacture to obtain a convex groove After the main body of the inner casing, the inner casing body and the inner casing cover are welded to form a whole inner casing, in which the top of the convex groove is welded to the inner casing cover; the inner cavity of the inner casing is divided by the convex groove A fold-back water channel is obtained. Both ends of the fold-back water channel are not closed, and there are water inlets and water outlets communicating with the outside.