CN111668994A - A liquid-cooled motor and flow control method - Google Patents

Abstract

The invention discloses a liquid-cooled motor, comprising: an outer casing, which is a first cylinder with a hollow interior, and a cylinder wall of the first cylinder is provided with a liquid inlet and a liquid outlet; a cooling casing, a cooling casing The body is a hollow second cylinder, the second cylinder is located inside the first cylinder, the outer wall of the second cylinder is provided with a cooling water channel, and the cooling water channel extends from the position of the second cylinder corresponding to the liquid inlet To the position corresponding to the second cylinder body and the liquid outlet, the second cylinder body is provided with a motor stator; the flow regulating component includes a regulating valve, a temperature sensor and a controller. The sensor is used to detect the temperature of the motor stator; the controller adjusts the opening of the regulating valve according to the temperature detected by the temperature sensor to control the flow of the cooling liquid into the motor. The liquid-cooled motor of the present invention can realize the self-regulation of the motor cooling liquid flow, so that the temperature rise of the motor is uniform, the stability is improved, and the structure is simple.

Description

A liquid-cooled motor and flow control method

technical field

The invention belongs to the technical field of liquid-cooled motors, and in particular relates to a flow control method of a liquid-cooled motor.

Background technique

As the requirements of motor applications become more and more stringent, the power density of the motor continues to increase, resulting in serious problems of motor heating. More motors use external cooling. For the existing liquid-cooled motors, the cooling structure is fixed, and its cooling flow rate fixed. For motors used in high-precision applications such as machine tools, the temperature rise of the motor is required to be stable, and the existing coolant flow rate is fixed, resulting in a low temperature rise of the motor under low load and a high temperature rise under high load, which will seriously affect the thermal deformation. The performance of the motor's running accuracy and so on.

Although the solution mentioned in the existing patent CN106374681A can realize the adjustment of the motor coolant flow, it needs to add an external electric pump, and also requires the linkage control between the motor controller and the electric pump. For most current machine tools and other applications , requiring each part to be compact in structure and reducing external components as much as possible, this implementation has obvious disadvantages.

In view of this, the present invention is proposed.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a liquid-cooled motor and a flow control method with a simple structure that can realize the self-regulation of the motor cooling liquid flow, make the motor temperature rise uniform, improve the stability, and have a simple structure.

In order to solve the above technical problems, the present invention proposes a liquid-cooled motor, including:

an outer casing, wherein the outer casing is a first cylinder with a hollow interior, and a liquid inlet and a liquid outlet are provided on the cylinder wall of the first cylinder;

a cooling shell, the cooling shell is a second cylindrical body with a hollow interior, the second cylindrical body is located inside the first cylindrical body, a cooling water channel is opened on the outer wall of the second cylindrical body, and the The cooling water channel extends from the position corresponding to the liquid inlet of the second cylinder to the position corresponding to the liquid outlet of the second cylinder, and a motor stator is arranged in the second cylinder;

The flow regulating assembly includes a regulating valve, a temperature sensor and a controller, the regulating valve is used to regulate the flow of the cooling liquid into the motor, and the temperature sensor is used to detect the temperature of the stator of the motor; The temperature detected by the temperature sensor adjusts the opening of the regulating valve to control the flow of the cooling liquid into the motor.

Further optionally, an installation groove is provided on the outer end surface of the cooling shell close to the liquid inlet of the cooling water channel, the controller is embedded in the installation groove, and the regulating valve is disposed in the liquid inlet. At the mouth, the temperature sensor is located in the motor stator; one end of the controller close to the outer casing is connected to the regulating valve, and one end close to the motor stator is connected to the temperature sensor.

Further optionally, the regulating valve includes a valve body and a connecting piece connected with the valve body, and the valve body is disposed at the liquid inlet through the connecting piece;

The valve body is provided with a fluid inlet, and the connector is provided with a fluid channel communicated with the fluid inlet, and the fluid channel communicates the fluid inlet and the liquid inlet of the cooling water channel; the A switch element is also arranged in the valve body, and the controller adjusts the flow rate of the cooling liquid entering the motor by controlling the size of the cross-sectional area of the fluid inlet opening by the switch element.

Further optionally, an installation through groove is opened on the side wall of the valve body, the installation through groove communicates the fluid inlet with the outside world, and the switch element is arranged in the installation through groove;

The switch element includes an electromagnetic coil and a movable magnetic slider that are sequentially arranged from outside to inside, the electromagnetic coil and the magnetic slider are connected by an elastic element, the electromagnetic coil is connected to the controller, and the control The controller adjusts the magnetic attraction force between the electromagnetic coil and the magnetic slider by controlling the magnitude of the current flowing through the electromagnetic coil, and the magnetic slider moves towards/away from the electromagnetic coil according to the change of the magnetic attraction force Move to adjust the size of the cross-sectional area of the fluid inlet.

Further optionally, the connecting member is a connecting screw, and the liquid inlet is provided with a thread matched with the connecting screw.

Further optionally, the flow regulating assembly further includes a generator, which generates electricity through kinetic energy provided by the cooling liquid, and provides electrical energy for the regulating valve.

Further optionally, a connection hole is provided at the inlet of the installation groove and the cooling water channel;

The generator includes a generator body and an impeller, the generator body is located in the installation groove and is integrated with the controller, and the impeller is located at a position where the inlet of the cooling water channel is opposite to the liquid inlet , the impeller is connected with a rotating shaft, and the rotating shaft is connected with the main body of the generator through the connecting hole.

Further optionally, the cooling water channel extends in a spiral shape from a position of the second cylinder corresponding to the liquid inlet to a position of the second cylinder corresponding to the liquid outlet.

Further optionally, the motor stator includes a stator winding, and the temperature sensor is located in the stator winding.

The present invention also provides a flow control method for a liquid-cooled motor, which adjusts the opening of the flow valve according to the temperature detected by the temperature sensor.

Further optionally, when the temperature of the motor stator is greater than the preset temperature, the opening of the flow valve is increased to increase the flow rate of the cooling liquid, until the temperature of the motor stator decreases to the preset temperature, and the flow adjustment is stopped;

When the temperature of the motor stator is lower than the preset temperature, the opening of the flow valve is reduced to reduce the flow of the cooling liquid until the temperature of the motor stator rises to the preset temperature, and the flow adjustment is stopped.

Further optionally, when the temperature of the motor stator is greater than a preset temperature, the current value flowing through the electromagnetic coil is increased, so that the magnetic slider moves toward the direction close to the electromagnetic coil until the temperature of the motor stator decreases. to the preset temperature and maintain the current current value;

When the temperature of the motor stator is lower than the preset temperature, the current value flowing through the electromagnetic coil is reduced, so that the magnetic slider moves away from the electromagnetic coil until the temperature of the motor stator is reduced to the preset temperature, The current current value is maintained.

After adopting the above-mentioned technical scheme, the present invention has the following beneficial effects compared with the prior art:

1. The liquid-cooled motor of the present invention realizes the self-regulation of the motor cooling liquid flow;

2. The temperature rise of the liquid-cooled motor of the present invention is uniform, and the running stability is improved;

3. The liquid-cooled motor of the present invention improves the running accuracy of the motor and is suitable for more high-precision applications;

4. The liquid-cooled motor of the present invention has a simple structure and does not require an external power source.

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, as a part of the present invention, are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings in the following description are only some embodiments, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort. In the attached image:

FIG. 1 is a schematic structural diagram of a liquid-cooled motor according to an embodiment of the present invention;

Fig. 2: is the sectional view of Fig. 1;

FIG. 3 is a schematic structural diagram of a flow regulating assembly according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a regulating valve according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a cooling shell according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of an outer casing according to an embodiment of the present invention;

FIG. 7 is a control flow chart of an embodiment of the present invention.

Among them: 1. Outer shell; 11. Liquid inlet; 12. Liquid outlet; 2. Cooling shell; 21. Cooling water channel; 22. Installation slot; 3. Motor stator; 31. Stator winding; 4. Flow adjustment components 41, regulating valve; 42, power supply box; 43, temperature sensor; 44, impeller; 45, fixing screw; 46, shaft; 411, valve body; 412, connecting piece; 4111, fluid inlet; 4112, solenoid coil; 4113 , spring; 4114, magnetic slider; 4115, installation channel; 4121, fluid channel;

It should be noted that these drawings and written descriptions are not intended to limit the scope of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used to illustrate the present invention , but are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, It is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "contacted" and "connected" should be understood in a broad sense, for example, it may be The fixed connection can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

This embodiment proposes a liquid-cooled motor, as shown in FIG. 1 to FIG. 6 , including an outer casing 1 , a cooling casing 2 , a motor stator 3 and a flow adjustment assembly 4 . As shown in FIG. 6 , the outer casing 1 is a first cylinder with a hollow interior, and a liquid inlet 11 and a liquid outlet 12 are provided on the cylinder wall of the first cylinder; as shown in FIG. 5 , the cooling casing 2 is an internal A hollow second cylinder, the second cylinder is located inside the first cylinder, a cooling water channel 21 is opened on the outer wall of the second cylinder, and the cooling water channel 21 extends from the position of the second cylinder corresponding to the liquid inlet 11 To the position corresponding to the second cylinder body and the liquid outlet 12, the motor stator 3 is arranged in the second cylinder body; The position of the second cylinder body corresponding to the liquid outlet 12 can be set in this way to increase the area through which the cooling liquid flows on the cooling shell 2, so as to obtain a better cooling effect. The cooling liquid flows into the water inlet of the cooling water channel 21 through the liquid inlet 11 on the outer shell 1, and the cooling liquid flows to the water outlet of the water channel along with the direction of the cooling water channel 21 on the cooling shell 2, and finally flows out through the liquid outlet 12 of the outer shell 1. motor. The cooling liquid takes away the heat dissipated by the motor stator 3 during the flow of the cooling casing 2 , thereby playing a role in cooling.

As shown in FIG. 2 and FIG. 3 , the flow regulating assembly 4 includes a regulating valve 41, a temperature sensor 43 and a controller. The regulating valve 41 is used to regulate the flow rate of the cooling liquid entering the motor, and the temperature sensor 43 is used to detect the temperature of the motor stator 3; The controller adjusts the opening of the regulating valve 41 according to the temperature detected by the temperature sensor 43 to control the flow rate of the cooling liquid entering the motor. Preferably, the motor stator 3 includes a stator winding 31 , a temperature sensor 43 is located in the stator winding 31 , and the temperature sensor 43 detects the temperature of the stator winding 31 .

Specifically, as shown in FIG. 2 , a mounting groove 22 is provided on the outer end surface of the cooling shell 2 close to the liquid inlet of the cooling water channel 21 , the controller is embedded in the mounting groove 22 , and the regulating valve 41 is provided at the liquid inlet 11 . , the temperature sensor 43 is located in the motor stator 3 ; one end of the controller close to the outer casing 1 is connected to the regulating valve 41 , and one end close to the motor stator 3 is connected to the temperature sensor 43 . The controller changes the valve size of the regulating valve 41 according to the motor temperature, and then controls the motor cooling water flow until the motor temperature reaches the preset temperature.

As shown in FIG. 3 , the regulating valve 41 includes a valve body 411 and a connecting piece 412 connected to the valve body 411. The valve body 411 is disposed at the liquid inlet 11 through the connecting piece 412; the valve body 411 is provided with a fluid inlet 4111, and the connecting piece 412 is provided with a fluid channel 4121 that communicates with the fluid inlet 4111, and the fluid channel 4121 connects the fluid inlet 4111 with the liquid inlet of the cooling water channel 21; the valve body 411 is also provided with a switch element, and the controller opens the fluid by controlling the switch element The size of the cross-sectional area of the inlet 4111 adjusts the flow of coolant into the motor. As shown in FIG. 4 , an installation through groove 4115 is opened on the side wall of the valve body 411. The installation through groove 4115 communicates the fluid inlet 4111 with the outside world, and the switch element is arranged in the installation through groove 4115; The electromagnetic coil 4112 and the movable magnetic slider 4114 are provided, and the electromagnetic coil 4112 and the magnetic slider 4114 are connected through an elastic member, preferably through a spring 4113 . The electromagnetic coil 4112 is connected to the controller, and the controller adjusts the magnetic attraction force between the electromagnetic coil 4112 and the magnetic slider 4114 by controlling the magnitude of the current flowing through the electromagnetic coil 4112, and the magnetic slider 4114 moves toward/away from the electromagnetic coil according to the change of the magnetic attraction force. 4112 to adjust the size of the cross-sectional area of the fluid inlet 4111. The connecting piece 412 is a connecting screw, the liquid inlet 11 is provided with a thread that matches the connecting screw, and the regulating valve 41 is connected with the casing through the screw thread. motor flow.

After the motor starts to run, the external coolant enters the motor cooling housing 2 and starts to cool down the motor. When the motor load is low, the motor generates less heat, but the coolant flow is large, and its temperature is lower than the preset temperature of the controller. At this time, the controller controls the regulating valve 41 to reduce the inlet area after receiving the temperature signal, and the water flows into the motor. When the flow rate decreases, the temperature rise of the motor increases until the preset temperature of the controller is reached, and the regulating valve 41 stops the flow adjustment. On the contrary, when the working load of the motor suddenly increases and the temperature of the motor increases, the controller controls the regulating valve 41 to increase the flow until the temperature of the motor drops to the preset temperature. This system can realize the self-regulation of the motor temperature without adding external equipment, so that the temperature rise of the motor remains constant, so that the motor maintains a stable working state, and the operation accuracy is greatly improved. For the current high-end machine tools, aerospace and other high-end It has great application value in application occasions.

Further optionally, the flow regulating assembly 4 further includes a generator, and the generator generates electricity through the kinetic energy provided by the cooling liquid, and provides electrical energy for the regulating valve 41 .

Specifically, as shown in FIGS. 2 and 3 , a connection hole is provided at the entrance of the installation slot 22 and the cooling water channel 21; the generator includes a generator body and an impeller 44, and the generator body is located in the installation slot 22 and is integrated with the controller The impeller 44 is located at the position opposite to the inlet of the cooling water channel 21 and the liquid inlet 11, the impeller 44 is connected with a rotating shaft 46, and the rotating shaft 46 is connected to the main body of the generator through the connecting hole. As shown in FIG. 1 and FIG. 2 , the controller and the generator are collectively integrated to form a power supply box 42 , the power supply box 42 is located in the installation slot 22 , the power supply box 42 is fixed on the cooling housing 2 by fixing screws 45 , and the generator rotating shaft 46 The cooling water channel 21 is inserted through the connecting hole, and the generator impeller 44 is mounted on the rotating shaft 46 and placed at the inlet of the cooling water channel 21 .

The motor coolant flows into the cooling shell 2 after passing through the flow valve, and the kinetic energy and potential energy of the coolant push the impeller 44 below the inlet of the cooling water channel 21 to rotate, driving the generator to generate electricity, thereby providing a power source for the flow regulating valve 41 to realize the flow rate of the motor coolant adjust.

The present invention also proposes a flow control method for a liquid-cooled motor, which adjusts the opening of the flow valve according to the temperature detected by the temperature sensor 43 .

7 is the control flow chart of the present embodiment, the temperature sensor 43 detects the temperature of the motor stator 3, and the temperature of the motor stator 3 feeds back the motor temperature, and the temperature sensor 43 feeds back the detected motor temperature to the controller. When the temperature is greater than the preset temperature, increase the opening of the flow valve to increase the flow of the coolant until the temperature of the motor stator 3 drops to the preset temperature, and stop the flow adjustment; when the temperature of the motor stator 3 is lower than the preset temperature, reduce the flow rate. The opening of the small flow valve reduces the flow of the cooling liquid until the temperature of the motor stator 3 rises to the preset temperature, and the flow adjustment is stopped. The generator provides electrical energy for the flow regulating process of the flow valve.

Further optionally, when the temperature of the motor stator 3 is greater than the preset temperature, the current value flowing through the electromagnetic coil 4112 is increased, so that the magnetic slider 4114 moves toward the direction close to the electromagnetic coil 4112 until the temperature of the motor stator 3 drops to The preset temperature is maintained, and the current current value is maintained; when the temperature of the motor stator 3 is lower than the preset temperature, the current value flowing through the electromagnetic coil 4112 is reduced, so that the magnetic slider 4114 moves away from the electromagnetic coil 4112 until the motor stator 3 The temperature is lowered to the preset temperature and the current current value is maintained.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Within the scope of the technical solution of the present invention, personnel can make some changes or modifications to equivalent examples of equivalent changes by using the above-mentioned technical content, but any content that does not depart from the technical solution of the present invention is based on the technical solution of the present invention. Substantially any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the solutions of the present invention.

Claims (12)

1. A liquid-cooled electric machine, comprising:

the device comprises an outer shell, a first barrel and a second barrel, wherein the outer shell is hollow, and a liquid inlet and a liquid outlet are formed in the wall of the first barrel;

the cooling shell is a second cylinder body which is hollow inside, the second cylinder body is positioned inside the first cylinder body, a cooling water channel is formed in the outer wall of the second cylinder body, the cooling water channel extends from the position, corresponding to the liquid inlet, of the second cylinder body to the position, corresponding to the liquid outlet, of the second cylinder body, and a motor stator is arranged in the second cylinder body;

the flow regulating assembly comprises a regulating valve, a temperature sensor and a controller, wherein the regulating valve is used for regulating the flow of the cooling liquid entering the motor, and the temperature sensor is used for detecting the temperature of the stator of the motor; the controller adjusts the opening of the regulating valve according to the temperature detected by the temperature sensor to control the flow of the cooling liquid entering the motor.

2. The liquid-cooled motor of claim 1, wherein the cooling housing is provided with a mounting groove near an outer end surface of the liquid inlet of the cooling water channel, the controller is embedded in the mounting groove, the regulating valve is arranged at the liquid inlet, and the temperature sensor is positioned in the motor stator; one end of the controller, which is close to the outer shell, is connected with the regulating valve, and one end of the controller, which is close to the motor stator, is connected with the temperature sensor.

3. The liquid-cooled motor of claim 2, wherein the regulating valve comprises a valve body and a connecting piece connected with the valve body, and the valve body is arranged on the liquid inlet through the connecting piece;

the valve body is provided with a fluid inlet, a fluid channel communicated with the fluid inlet is arranged in the connecting piece, and the fluid channel communicates the fluid inlet with a liquid inlet of the cooling water channel; the valve body is also internally provided with a switch piece, and the controller regulates the flow of the cooling liquid entering the motor by controlling the size of the cross section area of the fluid inlet opened by the switch piece.

4. The liquid-cooled motor of claim 3, wherein a mounting through groove is formed in a side wall of the valve body, the mounting through groove communicates the fluid inlet with the outside, and the switch member is disposed in the mounting through groove;

the switch piece comprises an electromagnetic coil and a movable magnetic sliding block which are sequentially arranged from outside to inside, the electromagnetic coil is connected with the magnetic sliding block through an elastic piece, the electromagnetic coil is connected with the controller, the controller adjusts the magnetic attraction force between the electromagnetic coil and the magnetic sliding block by controlling the current flowing through the electromagnetic coil, and the magnetic sliding block moves towards the direction close to/far away from the electromagnetic coil according to the change of the magnetic attraction force to adjust the size of the cross-sectional area of the fluid inlet.

5. The liquid-cooled motor of claim 3, wherein the connecting piece is a connecting screw rod, and the liquid inlet is provided with threads matched with the connecting screw rod.

6. A liquid-cooled machine as claimed in any one of claims 1 to 5, wherein the flow regulating assembly further comprises a generator for generating electricity from the kinetic energy provided by the coolant and for providing electrical power to the regulating valve.

7. The liquid-cooled motor of claim 6, wherein a connecting hole is formed at the inlet of the mounting groove and the cooling water channel;

the generator comprises a generator body and an impeller, the generator body is located in the mounting groove and integrally arranged with the controller, the impeller is located at the position where the inlet of the cooling water channel is opposite to the liquid inlet, the impeller is connected with a rotating shaft, and the rotating shaft penetrates through the connecting hole and is connected with the generator main body.

8. A liquid-cooled machine as claimed in any one of claims 1 to 5, wherein the cooling water channel extends helically from the position of the second cylinder corresponding to the liquid inlet to the position of the second cylinder corresponding to the liquid outlet.

9. A liquid-cooled machine as claimed in any one of claims 1 to 5, wherein the machine stator comprises stator windings and the temperature sensor is located within the stator windings.

10. A method of controlling the flow rate of a liquid-cooled motor as claimed in any one of claims 1 to 9, characterized by adjusting the opening of said flow valve in response to the temperature detected by said temperature sensor.

11. The flow control method according to claim 10, characterized in that when the temperature of the motor stator is higher than the preset temperature, the opening degree of the flow valve is increased to increase the flow of the cooling liquid until the temperature of the motor stator is reduced to the preset temperature, and the flow regulation is stopped;

and when the temperature of the motor stator is lower than the preset temperature, reducing the opening of the flow valve to reduce the flow of the cooling liquid until the temperature of the motor stator is raised to the preset temperature, and stopping flow regulation.

12. The flow control method according to claim 11, wherein when the temperature of the motor stator is higher than a preset temperature, the current value flowing through the electromagnetic coil is increased, so that the magnetic slider moves towards the direction close to the electromagnetic coil until the temperature of the motor stator is reduced to the preset temperature, and the current value is maintained;

and when the temperature of the motor stator is lower than the preset temperature, reducing the current value flowing through the electromagnetic coil, and moving the magnetic slider in the direction away from the electromagnetic coil until the temperature of the motor stator is reduced to the preset temperature, and maintaining the current value.

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