WO2020113422A1

WO2020113422A1 - Electric motor

Info

Publication number: WO2020113422A1
Application number: PCT/CN2018/119183
Authority: WO
Inventors: 冯伟; 张国庆; 熊新红; 张艳辉; 陈连波; 张晨宁; 冯亚春
Original assignee: 深圳先进技术研究院
Priority date: 2018-12-04
Filing date: 2018-12-04
Publication date: 2020-06-11

Abstract

The present invention relates to the technical field of driving elements. Provided is an electric motor. The electric motor comprises a stator, a rotor, a housing, a front end cap, a rear end cap, and an electric motor shaft. The front end cap is fixed at the front end of the housing. The rear end cap is fixed at the rear end of the housing. The stator and the rotor are installed inside the housing. The rotor is housed in the stator. The electric motor shaft is inserted into the rotor. A surrounding cooling channel is provided in the electric motor shaft along an axial direction thereof. A first fluid inlet and a first fluid outlet are formed at a distal end of the electric motor shaft. A liquid feed/discharge device is installed at the distal end of the electric motor shaft to feed a cooling fluid from the first fluid inlet and to discharge the cooling fluid from the first fluid outlet. When the electric motor of the present invention is operating, circulation of the cooling fluid in the cooling channel inside the electric motor shaft can effectively remove heat from the electric motor shaft, and other components inside the electric motor are cooling down with the cooling of the electric motor shaft, thereby achieving favorable cooling effect.

Description

A motor

Technical field

The invention relates to the technical field of driving elements, in particular to a motor.

Background technique

With the development of the manufacturing technology of the motor, the power of the motor has been increasing, and the load of the motor is also increasing. This causes the motor to generate high heat due to friction, load, eddy current and other factors during work, which seriously affects In order to improve the working performance and life of the motor, it is necessary to apply the motor cooling technology to the motor. At present, the technology in this field is mainly divided into three types according to the cooling medium: gas cooling, liquid cooling and heat conduction medium heat dissipation. Among them, in order to meet the working requirements of the motor, it must have good cooling performance, and liquid cooling is currently the best solution.

Due to the limitation of the structure of the motor, most of the liquid cooling of the motor is concentrated on fixed components, such as the housing and stator of the motor. The motor spindle as a high-speed rotating component, its cooling technology is still relatively lacking. Even if the lubrication technology and processing method are improved, friction will still generate a lot of heat, and the magnetic field will generate eddy currents inside the motor shaft, plus the heat transferred by the rotor, these factors will cause the motor shaft to generate high temperatures, which will damage the shaft and shafting parts. Cooperate with it, it will malfunction and reduce life under high-speed rotation. In the prior art, a cooling channel is provided on the inner center line of the motor shaft to cool the motor shaft. However, in this technology, since the cooling channel is provided at the axis of the motor main shaft, it is difficult to obtain an ideal cooling effect for a portion of the motor main shaft far away from the axis.

technical problem

The technical problem to be solved by the present invention is to provide a motor, which aims to solve the problem that the motor in the prior art is difficult to achieve an ideal cooling effect during working.

Technical solution

A first aspect of an embodiment of the present invention provides a motor including a stator, a rotor, a housing, a front end cover, a rear end cover, and a motor shaft, the front end cover is fixed to the front end of the housing, and the rear end cover is fixed to the rear of the housing End, the stator and the rotor are installed in the housing, the rotor is sleeved in the stator, the motor shaft is penetrated in the rotor, characterized in that the motor shaft is provided with A cooling channel that surrounds the shaft in the axial direction, and the cooling channel forms a first liquid inlet and a first liquid outlet at the end of the motor shaft; The liquid inlet is provided with a cooling liquid and a liquid inlet and outlet device for discharging the cooling liquid at the first liquid outlet.

Based on the first aspect of the embodiment of the present invention, in a first possible implementation manner, a liquid inlet check valve is installed at the first liquid inlet, and a liquid outlet check valve is installed at the first liquid outlet.

Based on the first aspect of the embodiment of the present invention, in a second possible implementation manner, a connection sleeve is provided between the liquid inlet and outlet device and the end of the motor shaft, and the connection sleeve is opposite to the The liquid inlet and outlet device rotates, and a partition is provided in the middle of the connecting sleeve, the partition separates a liquid inlet cavity in communication with the first liquid inlet and a first liquid outlet in the connection sleeve A liquid outlet cavity in which the port is connected; a second liquid inlet and a second liquid outlet are provided inside the liquid inlet and outlet device; during the rotation of the motor shaft, the second liquid inlet and the liquid inlet are respectively The cavity and the liquid outlet cavity are alternately connected, and the second liquid outlet is alternately communicated with the liquid outlet cavity and the liquid inlet cavity, respectively.

Based on the first aspect of the embodiments of the present invention, or the first possible implementation manner of the first aspect of the embodiments of the present invention, or the second possible implementation manner of the first aspect of the embodiments of the present invention, in the third possible implementation In the method, a cooling fan is sleeved on the motor shaft, the cooling fan is disposed in a cavity between the rear end cover and the stator, and the air outlet direction of the cooling fan is toward the end of the motor shaft .

Based on the third possible implementation manner of the first aspect of the embodiments of the present invention, in a fourth possible implementation manner, the connection portion between the connection sleeve, the liquid inlet and outlet device, and the end of the motor shaft is sealed Pieces sealed.

Based on the fourth possible implementation manner of the first aspect of the embodiments of the present invention, in a fifth possible implementation manner, the seal is a seal ring.

Based on the first aspect of the embodiments of the present invention, in a sixth possible implementation manner, the cooling channel is a U-shaped cooling channel.

Based on the sixth possible implementation manner of the first aspect of the embodiments of the present invention, in a seventh possible implementation manner, the cooling channel takes the axis of the motor shaft as an axis of symmetry.

Based on the first aspect of the embodiments of the present invention, in an eighth possible implementation manner, the cross-sectional shapes of the first liquid inlet and the first liquid outlet are both circular.

Beneficial effect

Compared with the prior art, the present invention has the beneficial effect that the present invention provides a cooling channel that surrounds in the axial direction of the motor shaft and forms a first liquid inlet and a second liquid inlet at the end of the motor shaft. , Using the liquid inlet and outlet device to pass the cooling liquid into the first liquid inlet, so that the cooling liquid passes through the cooling channel and is discharged from the first liquid outlet, and the winding path of the cooling liquid in the motor shaft can fully take the motor shaft Heat, and other components in the motor will also cool down as the motor shaft cools, which can achieve the desired cooling effect.

BRIEF DESCRIPTION

1 is a schematic diagram of the overall structure of a motor provided by an embodiment of the present invention;

FIG. 2 is a schematic sectional view taken along line A-A in FIG. 1;

FIG. 3 is a schematic view of the left side structure of the motor shown in FIG. 1.

In the drawings, each reference sign indicates:

1. Liquid inlet and outlet device; 2. Connection sleeve; 3. Rear end cover; 4. Motor shaft; 5. Cooling fan; 6. Rotor; 7. Stator; 8. Front end cover; 9. Second liquid outlet; 10. The second liquid inlet; 11. The first liquid inlet; 12. The first liquid outlet; 13. The housing; 14. The seal; 15. The liquid chamber; 16. The liquid inlet.

Embodiments of the invention

In order to make the purpose, features, and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Obviously, the description The embodiments are only a part of the embodiments of the present invention, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present invention.

An embodiment of the present invention provides a motor. Please refer to FIGS. 1 and 2. The motor includes:

Stator 7, rotor 6, housing 13, front end cover 8, rear end cover 3, and motor shaft 4; front end cover 8 is fixed to the front end of the housing 13, the rear end cover 3 is fixed to the rear end of the housing 13, stator 7 and rotor 6 Installed in the housing 13, the rotor 6 is sleeved in the stator 7, and the motor shaft 4 is inserted in the rotor 6.

Further, referring to FIG. 2, a cooling channel surrounding the axial direction is opened inside the motor shaft 4, and the cooling channel forms a first liquid inlet 11 and a first liquid outlet 12 at the end of the motor shaft 4. A liquid inlet and outlet device 1 for passing the cooling liquid into the first liquid inlet 11 and discharging the cooling liquid at the first liquid outlet 12 is installed at the end. Optionally, the first liquid inlet 11 is equipped with a liquid inlet check valve, and the first liquid outlet 12 is installed with a liquid outlet check valve. The one-way valve can ensure that the cooling fluid in the shaft of the motor shaft 4 rotates during the rotation of the motor shaft 4 The flow direction is consistent, thereby removing heat.

Further, referring to FIG. 2, a connection sleeve 2 is provided between the liquid inlet and outlet device 1 and the end of the motor shaft 4, and a partition plate is provided in the middle of the connection sleeve 2. The partition plate separates an liquid inlet chamber 16 and a liquid outlet inside the connection sleeve 2 Liquid chamber 15; the liquid inlet and outlet device 1 is provided with a second liquid inlet 10 and a second liquid outlet 9; the first liquid inlet 11, the liquid inlet chamber 16 and the second liquid inlet 10 form a passage, the first outlet The liquid port 12, the liquid outlet chamber 15 and the second liquid outlet 9 form another passage. In addition, the connection sleeve 2 and the liquid inlet and outlet device 1 can relatively rotate about the axis of the motor shaft 4.

The cooling channel of this embodiment is a U-shaped cooling channel, which is located in the motor shaft and is symmetrically arranged with the axis of the motor shaft as a symmetric axis. The path is longer than the path where the cooling channel only passes through the axis of the motor shaft, which can fully take away heat. And because of heat conduction, other components in the motor will also cool down as the motor shaft cools, which has a good cooling effect. In other embodiments, the cooling channel in the motor shaft may also have other shapes, which is not limited in this embodiment. Optionally, the first liquid inlet 11 and the first liquid outlet 12 have a cylindrical structure.

In addition, referring to FIG. 2 and FIG. 3, a cooling fan 5 is sleeved on the motor shaft 4 of this embodiment, and the cooling fan 5 is disposed in the cavity between the rear end cover 3 and the stator 7 and its air outlet direction faces the motor shaft 4 End. The water inlets and outlets of the motor shaft 4 are all in the wind direction of the cooling fan 5, even if leakage occurs in the case of long-term work wear, water will be blown to the outside of the motor and will not enter the motor and cause a short circuit.

In addition, the connection part between the connection sleeve 2 and the liquid inlet and outlet device 1 and the end of the motor shaft 4 of this embodiment is sealed with a seal 14. The sealing member 14 can ensure the sealing effect. After the first liquid inlet 11 of the liquid inlet and outlet device 1 is filled with water, a pressure difference can be ensured in the water inlet and outlet chambers. In other embodiments, a copper plug may also be provided at the connection part, as long as the sealing effect can be ensured.

As can be seen from the above, the motor provided in this embodiment includes a stator 7, a rotor 6, a housing 13, a front end cover 8 fixed to the front end of the housing 13, a rear end cover 3 fixed to the rear end of the housing 13, and a motor shaft 4; The shaft 4 is provided with a cooling channel that surrounds in the axial direction and forms a first liquid inlet 11 and a first liquid outlet 12 at the end of the motor shaft 4; the motor of this embodiment further includes a liquid inlet and outlet device 1 and a liquid inlet and outlet device 1 A connecting sleeve 2 is provided between the end of the motor shaft 4 and the connecting sleeve 2 and the liquid inlet and outlet device 1 can rotate relative to the axis of the motor shaft 4; the connection between the connection sleeve 2, the liquid inlet and outlet device 1 and the end of the motor shaft 4 The part is sealed with a sealing member 14. Since the motor provided by the present invention is only provided with a cooling channel connector at the same end, it is sufficient to ensure the air tightness of the end provided with the cooling channel connector, and the first liquid inlet 11 and the first The liquid outlet 12 and the liquid inlet and outlet device 1 are connected by a connecting sleeve 2 and the connection part between the connection sleeve 2, the liquid inlet and outlet device 1 and the liquid inlet and outlet of the end of the motor shaft 4 is sealed with a sealing member 14, airtightness is guaranteed, so the The machining accuracy of the main shaft is not too high, which can reduce the processing cost; the cooling liquid is introduced into the second liquid inlet 10 of the liquid inlet and outlet device 1. During the rotation of the motor shaft 4, the continuous flow of cooling liquid will cause the liquid inlet The pressure of the chamber 16 and the outlet chamber 15 alternately increase periodically. When the pressure of the liquid inlet chamber 16 increases, the pressure of the liquid outlet chamber 15 decreases, and the cooling fluid flows in from the first liquid inlet 11 of the motor shaft 4 and flows out of the first liquid outlet 12; when the pressure of the liquid outlet chamber 15 increases, The pressure of the liquid inlet chamber 16 is reduced. Due to the check valve function of the water inlet and outlet of the motor shaft 4, water will not flow in from the water outlet. In this way, the coolant has a fixed circulation channel in the motor shaft, and the path of the coolant in the motor shaft 4 is longer than the path of the cooling channel only through the axis of the motor shaft 4, which can fully remove the heat of the motor shaft and enhance the cooling effect .

In the several embodiments provided by the present invention, it should be understood that the disclosed device may be implemented in other ways.

In the above embodiments, the description of each embodiment has its own emphasis. For a part that is not detailed in an embodiment, you can refer to the related descriptions of other embodiments.

The above is a description of a motor provided by the present invention. For those of ordinary skill in the art, according to the ideas of the embodiments of the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification It should not be understood as a limitation of the present invention.

Claims

A motor includes a stator, a rotor, a housing, a front end cover, a rear end cover, and a motor shaft. The front end cover is fixed to the front end of the housing, the rear end cover is fixed to the rear end of the housing, and the stator and rotor are installed In the housing, the rotor is sleeved in the stator, and the motor shaft is inserted in the rotor, characterized in that the motor shaft is provided with cooling around the motor shaft in the axial direction A cooling channel, and the cooling channel forms a first liquid inlet and a first liquid outlet at the end of the motor shaft; the end of the motor shaft is provided with a passage for cooling liquid to the first liquid inlet and A liquid inlet and outlet device for discharging the cooling liquid at the first liquid outlet.
The motor according to claim 1, wherein a liquid inlet check valve is installed at the first liquid inlet, and a liquid outlet check valve is installed at the first liquid outlet.
The motor according to claim 2, wherein a connection sleeve is provided between the liquid inlet and outlet device and the end of the motor shaft, and the connection sleeve rotates relative to the liquid inlet and outlet device together with the motor shaft. A partition plate is provided in the middle of the connection sleeve, and the partition plate separates a liquid inlet cavity communicating with the first liquid inlet and a liquid outlet cavity communicating with the first liquid outlet in the connection sleeve ; The liquid inlet and outlet devices are provided with a second liquid inlet and a second liquid outlet; during the rotation of the motor shaft, the second liquid inlet alternates with the liquid inlet chamber and the liquid outlet chamber, respectively; Connected, the second liquid outlet is alternately communicated with the liquid outlet chamber and the liquid inlet chamber.
The motor according to any one of claims 1 to 3, wherein a cooling fan is sleeved on the motor shaft, and the cooling fan is disposed in a cavity between the rear end cover and the stator, Moreover, the wind direction of the cooling fan is toward the end of the motor shaft.
The motor according to claim 3, wherein a connection part between the connection sleeve, the liquid inlet and outlet device, and the end of the motor shaft is sealed with a sealing member.
The motor according to claim 5, wherein the seal is a seal ring.
The motor according to claim 1, wherein the cooling channel is a U-shaped cooling channel.
The motor according to claim 7, wherein the cooling channel has an axis of symmetry about the axis of the motor shaft.
The motor according to claim 1, wherein the cross-sectional shapes of the first liquid inlet and the first liquid outlet are both circular.