CN113078776B

CN113078776B - Motor and control method of motor

Info

Publication number: CN113078776B
Application number: CN202110494658.2A
Authority: CN
Inventors: 李大伟; 张俊来; 李萍; 沙伟; 夏顺礼; 张欢欢
Original assignee: Anhui Jianghuai Automobile Group Corp
Current assignee: Anhui Jianghuai Automobile Group Corp
Priority date: 2021-05-06
Filing date: 2021-05-06
Publication date: 2022-12-20
Anticipated expiration: 2041-05-06
Also published as: CN113078776A

Abstract

The invention discloses a motor and a control method of the motor, wherein the motor comprises a motor body and a cooling circulation system, the motor body comprises a shell, a stator fixedly arranged in the shell and a rotor rotatably arranged in the stator; the cooling circulation system comprises a stator cooling loop and a rotor cooling loop, the stator cooling loop is used for cooling the stator, the rotor cooling loop is used for cooling the rotor, and a valve used for conducting or cutting off the rotor cooling loop is arranged on the rotor cooling loop. The invention aims to solve the problems of increased energy consumption and resource waste caused by the fact that a motor rotor and a motor stator are always cooled simultaneously.

Description

Motor and control method of motor

Technical Field

The invention relates to the technical field of motors, in particular to a motor and a control method of the motor

Background

The motor is one of the most core parts of the new energy automobile, provides power for the automobile, and directly determines the core indexes of the acceleration performance, the highest speed, the climbing performance and the like of the whole automobile according to the quality of the motor performance, so the design and development of the motor for the new energy automobile are particularly important. The design of the motor not only has more important core indexes such as output power, torque, rotating speed and the like, but also has the heat dissipation problem of the motor due to the factors restricting the continuous power increase, the rotating speed increase and the light weight of the motor. The stator winding that the motor stator that generates heat divide into that the motor stator lets in the electric current and leads to generates heat, and the piece loss that dashes under the high-speed rotation of electric motor rotor generates heat and the magnet steel loss generates heat, therefore the motor is at the operation in-process, need cool off the rotor and the stator of motor, guarantees that the motor can not lead to damaging because of the high temperature. The existing motor cooling structure mostly dissipates heat to the motor rotor and the stator at the same time, and the cooling mode has high energy consumption and low cost performance.

Disclosure of Invention

The invention mainly aims to provide a motor and a control method of the motor, and aims to solve the problem that energy consumption is increased because a rotor and a stator of the motor are always cooled simultaneously.

In order to achieve the above object, the present invention provides a motor, including:

the motor comprises a motor body, a stator and a rotor, wherein the motor body comprises a shell, the stator is fixedly arranged in the shell, and the rotor is rotatably arranged in the stator; and the number of the first and second groups,

and the cooling circulation system comprises a stator cooling loop and a rotor cooling loop, the stator cooling loop is used for cooling the stator, the rotor cooling loop is used for cooling the rotor, and a valve used for conducting or cutting off the rotor cooling loop is arranged on the rotor cooling loop.

Optionally, the motor further includes a control device, the control device is electrically connected to the rotor and the valve, and is configured to control the valve to close when the rotation speed of the rotor is less than a preset rotation speed, so as to cut off the rotor cooling circuit, and control the valve to open when the rotation speed of the rotor is not less than the preset rotation speed, so as to turn on the rotor cooling circuit.

Optionally, the preset rotation speed is 10000r/min.

Optionally, the rotor has a rotational axis;

the cooling circulation system includes:

the main pipeline is provided with a pump body and a condenser;

the first cooling pipeline is arranged around the stator, and two ends of the first cooling pipeline are respectively communicated with two ends of the main pipeline to form the stator cooling loop; and the number of the first and second groups,

a second cooling pipeline, a part of the second cooling pipeline is located in the rotating shaft, two ends of the second cooling pipeline are communicated with two ends of the main pipeline respectively to form the rotor cooling loop, and the valve is arranged on the second cooling pipeline.

Optionally, the lateral wall of stator is equipped with first basin, the inside wall of casing is equipped with the second basin, first basin with the relative setting of second basin notch is in order to inject jointly first cooling tube, first cooling tube runs through the lateral wall of casing forms entry and export, the entry with the export respectively with the both ends intercommunication of trunk line.

Optionally, the first water tank includes a plurality of first annular grooves disposed around the stator and a plurality of first bar-shaped grooves extending in an axial direction of the stator, the plurality of first annular grooves are disposed at intervals in the axial direction of the stator, the plurality of first bar-shaped grooves are disposed at intervals in a circumferential direction of the stator, and each first bar-shaped groove is disposed to communicate with the plurality of first annular grooves;

the second water tank comprises a plurality of second annular grooves corresponding to the first annular grooves and a plurality of second strip-shaped grooves corresponding to the first strip-shaped grooves.

Optionally, the housing has two side walls oppositely arranged in the axial direction of the rotor;

the second cooling duct includes:

the two diversion pipelines are arranged corresponding to the two side walls, each diversion pipeline comprises a drainage tube arranged in the side wall and a diversion cavity formed in the side wall, the end part of the rotating shaft penetrates through the diversion cavity, one end of the drainage tube is communicated with the main pipeline, and the other end of the drainage tube is communicated with the diversion cavity; and the number of the first and second groups,

and the guide channel is formed in the rotating shaft and extends along the axial direction of the rotating shaft, and two ends of the guide channel are respectively communicated with the two guide cavities of the two guide pipelines.

Optionally, the motor further comprises a bearing sleeved on the rotating shaft, and the bearing is located in the flow guide cavity;

the motor still includes seal assembly, seal assembly includes that two covers establish the epaxial sealing washer of commentaries on classics, two the sealing washer divide to reside in the water conservancy diversion passageway with the both sides of the connector in water conservancy diversion chamber, and be located the bearing orientation one side of rotor.

The invention also provides a motor control method, which comprises the following steps:

providing a motor, wherein the motor comprises a motor body and a cooling circulation system, the motor body comprises a shell, a stator fixedly arranged in the shell and a rotor rotatably arranged in the stator, the cooling circulation system comprises a stator cooling loop for cooling the stator and a rotor cooling loop for cooling the rotor, and a valve for switching on or off the rotor cooling loop is arranged on the rotor cooling loop;

when the motor works, the rotating speed of the rotor is obtained;

comparing the rotating speed with a preset rotating speed;

and controlling a valve of a cooling circulation system of the motor to work according to the comparison result so as to conduct a rotor cooling loop of the cooling circulation system.

Optionally, the step of controlling a valve of a cooling circulation system of the electric machine to operate to open a rotor cooling circuit of the cooling circulation system according to the comparison result includes:

when the rotating speed of the rotor is lower than the preset rotating speed, controlling the valve to be closed so as to cut off the rotor cooling loop;

and when the rotating speed of the rotor is not less than the preset rotating speed, controlling the valve to be opened so as to conduct the rotor cooling loop.

In the technical scheme of the invention, the cooling circulation system comprises a stator cooling loop for cooling the stator and a rotor cooling loop for cooling the rotor, and in the running process of the motor, a cooling medium enters the stator cooling loop to cool the stator all the time, so that ablation caused by overhigh temperature of the stator is avoided; meanwhile, the rotor cooling loop is provided with a valve for conducting or cutting the rotor cooling loop, the valve is opened and conducted the rotor cooling loop, the cooling medium enters the rotor cooling loop and cools the rotor, at the moment, the cooling circulation system cools the stator and the rotor simultaneously, the valve is closed and cut the rotor cooling loop and stops cooling the rotor, and therefore the valve can be controlled to conduct and cut the rotor cooling loop and cool the stator, so that the rotor is cooled when the temperature of the rotor is low, and the cooling circulation system cools the rotor, so that the energy consumption is reduced and the energy is saved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a cross-sectional view of one embodiment of an electric machine provided by the present invention;

FIG. 2 is a cross-sectional view of the first cooling conduit of FIG. 1;

FIG. 3 is a cross-sectional view of the spindle of FIG. 1;

fig. 4 is a cross-sectional view of the stator of fig. 1.

Fig. 5 is a flowchart illustrating a control method of a motor according to an embodiment of the present invention.

The reference numbers illustrate:

reference numerals	Name(s)	Reference numerals	Name (R)
				100	Electric machine	241a	Drainage tube
1	Shell body	241b	Flow guide cavity
				11	First side wall	242	Flow guide channel
12	Second side wall	3	Bearing assembly
				2	Main pipeline	4	Seal assembly
21	Pump body	41	First seal ring
				22	Condenser	42	Second seal ring
23	First cooling pipe	5	Stator
				231	The first water tank	51	Second water tank
231a	First strip-shaped groove	511	Second strip-shaped groove
				231b	A first annular groove	512	Second annular groove
232	Inlet port	6	Rotor
				233	An outlet	7	Rotating shaft
24	Second cooling duct	71	Through hole
				241	Diversion pipeline	8	Valve gate

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indication is changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The existing motor cooling system mostly dissipates heat to the motor rotor and the stator all the time, and the rotor also dissipates heat to the rotor under the condition of less heat energy, so that the energy consumption is increased, and the resources are wasted.

In view of this, the present invention provides a motor 100. Fig. 1 shows an embodiment of a motor 100 provided by the present invention, please refer to fig. 1, where the motor 100 includes a motor body and a cooling circulation system, the motor body includes a housing 1, a stator 5 fixedly installed in the housing 1, and a rotor 6 rotatably installed in the stator 5; the cooling circulation system comprises a stator cooling loop for cooling the stator 5 and a rotor cooling loop for cooling the rotor 6, and a valve 8 for conducting or cutting off the rotor cooling loop is arranged on the rotor cooling loop.

In the technical solution of the present invention, the cooling circulation system includes a stator cooling loop for cooling the stator 5 and a rotor cooling loop for cooling the rotor 6, and in the operation process of the motor 100, a cooling medium enters the stator cooling loop to cool the stator 5 all the time, so as to avoid ablation caused by an excessively high temperature of the stator 5; meanwhile, a valve 8 for conducting or cutting the rotor cooling circuit is arranged on the rotor cooling circuit, the valve 8 is opened to conduct the rotor cooling circuit, the cooling medium enters the rotor cooling circuit to cool the rotor 6, at the moment, the cooling circulation system cools the stator 5 and the rotor 6 simultaneously, the valve 8 is closed to cut the rotor cooling circuit to stop cooling the rotor 6, and therefore the conduction and the cutting of the rotor cooling circuit can be controlled by controlling the valve 8 to cool the stator 5, so that the cooling circulation system is used for cooling the rotor 6 when the temperature of the rotor 6 is low, the energy consumption is reduced, and the energy is saved.

Referring to fig. 1, the motor 100 further includes a control device, the control device is electrically connected to the rotor 6 and the valve 8, and is configured to control the valve 8 to close to cut off the rotor cooling circuit when the rotation speed of the rotor 6 is less than a preset rotation speed, and control the valve 8 to open to conduct the rotor cooling circuit when the rotation speed of the rotor 6 is not less than the preset rotation speed. In the operation process of the motor 100, when the motor 100 operates at a low speed, the heat energy generated by the rotor 6 of the motor 100 is very little and can be dissipated by itself, and only when the rotation speed of the motor 100 is too high, the heat energy generated by the rotor 6 of the motor 100 needs to be cooled, in view of this, in this embodiment, a preset rotation speed is preset, and when the motor 100 operates and the rotation speed of the motor 100 exceeds the preset rotation speed, the valve 8 is controlled to be opened by the control device, the rotor cooling circuit is conducted, so that the cooling medium enters the rotor cooling circuit to circulate, and the rotor 6 is cooled; when the rotating speed of the motor 100 is smaller than the preset rotating speed, the control device controls the valve 8 to be closed and the rotor cooling loop to be cut off, so that the rotor 6 is stopped to be cooled, the rotor 6 is cooled by the control device, and the phenomenon that the rotor cooling loop cools the rotor 6 all the time, energy consumption is increased, and resources are wasted is avoided.

The preset rotating speed can be any value set by a user, such as 5000r/min, 8000r/min, 12000r/min, 13000r/min and the like. Specifically, referring to fig. 1, in the embodiment, the preset rotation speed is 10000r/min. The inventor reachs through the test, when electron rotational speed was less than 10000r/min, the heat that rotor 6 produced relies on self to be enough to dispel the heat, after motor 100 rotational speed exceeded 10000r/min, rotor 6 only relied on self to dispel the heat, can lead to the high temperature, influences motor 100 operation, this embodiment is through setting up predetermine the rotational speed at 10000r/min, has not only ensured motor 100 can not the high temperature, furthest has practiced thrift the energy consumption moreover.

Referring to fig. 1 and fig. 2, the rotor 6 includes a rotor 6 body and a rotating shaft 7, and the rotor 6 body is sleeved on the rotating shaft 7 and can rotate around the rotating shaft 7 in the axial direction; the cooling circulation system comprises a main pipe 2, a first cooling pipeline 23 and a second cooling pipeline 24; the main pipeline 2 is provided with a pump body 21 and a condenser 22; the first cooling pipeline 23 is arranged around the stator 5, and two ends of the first cooling pipeline 23 are respectively communicated with two ends of the main pipeline 2 to form the stator cooling loop; a part of the second cooling pipeline 24 is located in the rotating shaft 7, two ends of the second cooling pipeline 24 are respectively communicated with two ends of the main pipeline 2 to form the rotor cooling loop, and the valve 8 is arranged on the second cooling pipeline 24. In this embodiment, the condenser 22 is configured to exchange heat with a high-temperature cooling medium flowing through the condenser 22 to cool the high-temperature cooling medium into a low-temperature cooling medium; the pump body 21 is used for directional flow of the cooling medium in the cooling circulation system. In the first cooling circuit, the cooling medium flows through the condenser 22, the pump body 21 and the first cooling pipe 23 in sequence to form a circulation, and the stator 5 is cooled through the circulation flow; the first cooling pipeline 23 is arranged around the stator 5, so that the cooling medium in the first cooling pipeline 23 is in contact with the stator 5 more sufficiently, a large amount of heat energy generated by the stator 5 can be taken away, the cooling efficiency is improved, and the energy consumption is reduced. In the second cooling loop, the cooling medium flows through the condenser 22, the pump body 21, the valve 8 and the second cooling pipeline 24 in sequence to form circulation, and the cooling of the rotor 6 is realized through circulation flow; a part of the second cooling pipeline 24 is located in the rotating shaft 7, the rotating shaft 7 is in contact with the rotor 6 body, and when the cooling medium flows through the rotating shaft 7, the cooling medium dissipates heat to the rotor 6, so that the heat dissipation efficiency of the rotor 6 is improved, and ablation caused by overhigh temperature of the rotor 6 is avoided.

Referring to fig. 2, a first water tank 231 is disposed on an outer side wall of the stator 5, a second water tank 51 is disposed on an inner side wall of the housing 1, notches of the first water tank 231 and the second water tank 51 are oppositely disposed to define the first cooling pipe 23, the first cooling pipe 23 penetrates through the outer side wall of the housing 1 to form an inlet 232 and an outlet 233, and the inlet 232 and the outlet 233 are respectively communicated with two ends of the main pipe 2. In this embodiment, the first cooling pipe 23 is defined by the first water tank 231 and the second water tank 51, and since the first cooling pipe 23 at least partially penetrates through the housing 1 to be in direct contact with the outer side wall of the stator 5, the cooling medium is in more sufficient contact with the stator 5, and the cooling efficiency is further improved.

Further, referring to fig. 2 and 4, the first water tank 231 includes a plurality of first annular grooves disposed around the stator 5 and a plurality of first bar-shaped grooves 231a extending in the axial direction of the stator 5, the plurality of first annular grooves are disposed at intervals in the axial direction of the stator 5, the plurality of first bar-shaped grooves 231a are disposed at intervals in the circumferential direction of the stator 5, and each first bar-shaped groove 231a is disposed to communicate with the plurality of first annular grooves; the second water tank 51 includes a plurality of second annular grooves 512 corresponding to the first annular grooves, and a plurality of second bar-shaped grooves 511231b corresponding to the first bar-shaped grooves 231 a. In this embodiment, the plurality of first annular grooves are disposed around the stator 5 and are disposed at intervals, a first strip-shaped groove 231a is disposed between two adjacent first annular grooves, so that the plurality of first annular grooves can be connected to each other, the plurality of first strip-shaped grooves 231a are disposed along the axial direction of the concerned stator 5, and the plurality of first annular grooves and the plurality of first strip-shaped grooves 231a form the first water tank 231, so as to reduce the volume of the housing 1 occupied by the first water tank 231 and improve the strength of the housing 1 on one hand, and on the other hand, the covering area of the first cooling pipeline 23 on the outer side wall of the stator 5 is larger, so that the cooling medium is more fully contacted with the stator 5 on the other hand. In addition, the second annular groove 512 and the second strip-shaped groove 511 adopt the same technical solution as the first annular groove 231b and the first strip-shaped groove 231a, and are not described again here.

Referring to fig. 1 and 3, the housing 1 has two opposite side walls in the axial direction of the rotor 6, the two side walls including a first side wall 11 and a second side wall 12; the second cooling duct 24 includes two guide ducts 241 and a guide passage 242; the two diversion pipelines 241 are arranged corresponding to the two side walls, each diversion pipeline 241 comprises a drainage tube 241a arranged inside the side wall and a diversion cavity 241b formed inside the side wall, the end part of the rotating shaft 7 penetrates through the diversion cavity 241b, one end of the drainage tube 241a is communicated with the main pipeline 2, and the other end of the drainage tube 241a is communicated with the diversion cavity 241 b; the flow guide channel 242 is formed in the rotating shaft 7 and extends along the axial direction of the rotating shaft 7, and two ends of the flow guide channel 242 are respectively communicated with the two flow guide cavities 241b of the two flow guide pipelines 241. In an embodiment, through holes 71 penetrating through the rotating shaft 7 are formed in a contact portion of the rotating shaft 7 and the flow guiding cavity 241b, the number of the through holes 71 is not limited, in this embodiment, the number of the through holes 71 is eight, and the through holes are distributed at equal intervals in the circumferential direction of the rotating shaft 7 at the contact portion of the rotating shaft 7 and the flow guiding cavity 241b, when the valve 8 is opened, the cooling medium in the main pipe 2 enters the flow guiding cavity 241b in the first side wall 11 through the drainage tube 241a, the cooling medium enters the flow guiding channel 242 through the through holes 71 to cool the rotor 6, and then the cooling medium flows into the flow guiding cavity 241b in the second side wall 12 from the through hole 71 at the other end of the rotating shaft 7 and then flows back to the main pipe 2 from the drainage tube 241a connected with the flow guiding cavity 241b, so as to complete a cooling cycle.

Referring to fig. 1, the motor 100 further includes two bearings 3 sleeved on the rotating shaft 7, and the two bearings 3 are respectively located in the two flow guide cavities 241 b; motor 100 still includes seal assembly 4, seal assembly 4 includes that two covers establish the epaxial sealing washer of pivot 7, two the sealing washer divide to reside in water conservancy diversion passageway 242 with the both sides of the connector of water conservancy diversion chamber 241b, and be located bearing 3 orientation one side of rotor 6, likewise, seal assembly 4 also is equipped with two, and two seal assembly 4 are located two respectively in the water conservancy diversion chamber 241 b. In this embodiment, the bearing 3 is sleeved at two ends of the rotating shaft 7, the flow guide channel 242 extends to a contact portion between the bearing 3 and the rotating shaft 7, and the second cooling channel cools the bearing 3 while cooling the rotor 6, so as to avoid ablation caused by over-high temperature of the bearing 3; specifically, the sealing assembly 4 includes a first sealing ring 41 and a second sealing ring 42 which are sleeved on the rotating shaft 7, and both the sealing rings are abutted between the outer side wall of the rotating shaft 7 and the inner side wall of the diversion cavity 241b to achieve a sealing effect. Setting a connection port between the diversion channel 242 and the diversion cavity 241b as a first connection port, setting a connection port between the diversion cavity 241b and the drainage tube 241a as a second connection port, and setting the first connection port and the second connection port oppositely, wherein the bearing 3, the first sealing ring 41, the first connection port and the second sealing ring 42 are sequentially arranged at intervals in a direction from the end part of the rotating shaft 7 to a containing cavity formed in the housing 1, so that the cooling medium is prevented from entering the bearing 3 or the inside of the motor 100 to damage the motor 100.

Based on the above hardware conditions, the present invention further provides a method for controlling the motor 100, please refer to fig. 5, and fig. 5 is a schematic flowchart of an embodiment of the motor 100 provided in this embodiment.

S10, providing the electric machine 100 as described above.

Motor 100 includes motor body and cooling circulation system, motor body includes casing 1, fixed mounting stator 5 in the casing 1 with rotationally locate rotor 6 in the stator 5, cooling circulation system is including being used for right stator 5 carries out refrigerated stator cooling circuit and is used for right rotor 6 carries out refrigerated rotor cooling circuit, be equipped with on the rotor cooling circuit and be used for switching on or cutting rotor cooling circuit's valve 8 motor 100 operation, cooling circulation system can take away most heat energy that motor 100 produced avoids motor 100 inside high temperature is right motor 100 causes the damage.

And S20, acquiring the rotating speed of the rotor 6 when the motor 100 works.

And S30, comparing the rotating speed with the preset rotating speed.

And S40, controlling a valve 8 of a cooling circulation system of the motor 100 to work according to the comparison result so as to conduct a rotor cooling loop of the cooling circulation system.

When the motor 100 starts to work, acquiring a rotating speed value of the rotor 6 and sending the rotating speed value to the control device; the control device compares the current rotating speed of the rotor 6 with the preset rotating speed and obtains a comparison result; then, the control device controls the valve 8 to be opened or closed according to the comparison result, and further controls the rotor cooling loop to be switched on or switched off; according to the method, the preset rotating speed is set, the current rotating speed is obtained and compared, and whether cooling intervention is performed on the rotor 6 is controlled according to the comparison result, so that when the temperature of the rotor 6 is low, the rotor 6 is used for cooling, and when the temperature of the rotor 6 is too high, the cooling intervention is performed, so that the overheating problem can not occur in the operation process of the motor 100, the energy consumption is reduced, and the resource waste is avoided.

Referring to fig. 5, when the motor 100 is running, the rotor 6 of the motor 100 rotates along with the motor, and in order to control the valve to open or close more accurately, in this embodiment, the step S40 includes:

s41: when the rotating speed of the rotor 6 is lower than the preset rotating speed, the valve 8 is controlled to be closed so as to cut off the rotor cooling loop;

s42: and when the rotating speed of the rotor 6 is not less than the preset rotating speed, controlling the valve 8 to be opened so as to conduct the rotor cooling loop.

Controlling a valve 8 of a cooling circulation system of the motor 100 to work and switching on or off the rotor cooling loop according to the comparison result; specifically, when the rotating speed of the rotor 6 is lower than the preset value, the rotor cooling circuit is cut off, the rotor 6 is used for heat dissipation, energy consumption is reduced, and energy is saved, and when the rotating speed of the rotor 6 is higher than the preset value, the rotor cooling circuit is conducted to dissipate heat of the rotor 6.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. An electric machine, characterized in that the electric machine comprises:

the motor comprises a motor body, a stator and a rotor, wherein the motor body comprises a shell, the stator is fixedly arranged in the shell, the rotor is rotatably arranged in the stator, the rotor is provided with a rotating shaft, and the shell is provided with two side walls which are oppositely arranged in the axial direction of the rotor;

the cooling circulation system comprises a stator cooling loop and a rotor cooling loop, the stator cooling loop is used for cooling the stator, the rotor cooling loop is used for cooling the rotor, and a valve used for conducting or cutting off the rotor cooling loop is arranged on the rotor cooling loop; the cooling circulation system comprises a main pipeline, a first cooling pipeline and a second cooling pipeline; the main pipeline is provided with a pump body and a condenser; the first cooling pipeline is arranged around the stator, and two ends of the first cooling pipeline are respectively communicated with two ends of the main pipeline to form the stator cooling loop; a part of the second cooling pipeline is positioned in the rotating shaft, two ends of the second cooling pipeline are respectively communicated with two ends of the main pipeline to form the rotor cooling loop, and the valve is arranged on the second cooling pipeline; the second cooling pipeline comprises two flow guide pipelines and flow guide channels, the two flow guide pipelines are arranged corresponding to the two side walls, each flow guide pipeline comprises a drainage pipe arranged in the side wall and a flow guide cavity formed in the side wall, the end part of the rotating shaft penetrates through the flow guide cavity, one end of the drainage pipe is communicated with the main pipeline, and the other end of the drainage pipe is communicated with the flow guide cavity; the guide channel is formed in the rotating shaft and extends along the axial direction of the rotating shaft, and two ends of the guide channel are respectively communicated with the two guide cavities of the two guide pipelines;

the bearing is sleeved on the rotating shaft and is positioned in the flow guide cavity;

the sealing assembly comprises two sealing rings sleeved on the rotating shaft, the two sealing rings are respectively arranged on two sides of a connecting port of the flow guide channel and the flow guide cavity and are positioned on one side of the bearing, which faces the rotor; and the number of the first and second groups,

controlling means, controlling means with the rotor with the valve electricity is connected, is used for when the rotational speed of rotor is less than predetermineeing the rotational speed, control the valve is closed, in order to cut rotor cooling circuit the rotational speed of rotor is not less than when predetermineeing the rotational speed, control the valve is opened, in order to switch on rotor cooling circuit, it is 10000r/min to predetermine the rotational speed.

2. The motor of claim 1, wherein a first water groove is formed on an outer side wall of the stator, a second water groove is formed on an inner side wall of the housing, notches of the first water groove and the second water groove are oppositely arranged to define the first cooling pipeline together, the first cooling pipeline penetrates through the outer side wall of the housing to form an inlet and an outlet, and the inlet and the outlet are respectively communicated with two ends of the main pipeline.

3. The motor of claim 2, wherein the first water tank includes a plurality of first annular grooves provided around the stator and a plurality of first bar-shaped grooves extending in an axial direction of the stator, the plurality of first annular grooves are provided at intervals in the axial direction of the stator, the plurality of first bar-shaped grooves are provided at intervals in a circumferential direction of the stator, and each of the first bar-shaped grooves is provided in communication with the plurality of first annular grooves;

4. A method of controlling a motor, comprising the steps of:

providing an electrical machine according to any one of claims 1 to 3;

when the motor works, the rotating speed of the rotor is obtained;

comparing the rotating speed with the preset rotating speed;

5. The method for controlling a motor according to claim 4, wherein the step of controlling the operation of a valve of a cooling cycle of the motor to open a rotor cooling circuit of the cooling cycle based on the comparison result comprises:

when the rotating speed of the rotor is lower than a preset rotating speed, controlling the valve to be closed so as to cut off the rotor cooling loop;