Motor and driving system with motor

Abstract

The utility model discloses a motor and a driving system, and the motor comprises a first housing which defines a first accommodation cavity and is provided with a first hole; the stator is arranged in the first accommodating cavity; the rotor is arranged in the first containing cavity and located in the stator, the rotor comprises a first end portion, the first end portion penetrates through the first shell and is used for outputting torque to the outside, and the first hole is formed in the wall portion of the side, close to the first end portion, of the first shell; the circuit board is arranged in the first containing cavity and located on the side, away from the first end portion, of the rotor; the rotor is provided with a flow guide structure located in the first containing cavity, and when the flow guide structure rotates along with rotation of the rotor, the flow guide structure can drive the first fluid entering the first containing cavity from the first hole, so that the first fluid flows to the position making contact with the circuit board. In the application, the first fluid can cool the circuit board, so that the service life of the circuit board can be prolonged, and the safety performance of the circuit board can also be improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the field of electromechanics, in particular to a motor and a driving system with the motor. BACKGROUND

[0002] The motor is a common driving device. The motor comprises a shell, a stator, a rotor and a circuit board. The stator, the rotor and the circuit board are all arranged in the shell, and the rotor can rotate relative to the stator to deliver power to the outside, and the circuit board is at least used for controlling the rotation of the rotor. The working temperature of the circuit board of the existing motor is too high, and it is difficult to effectively cool it. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a motor and a driving system with the motor, which can reduce the temperature of the circuit board in the motor.

[0004] To solve the above technical problems, the first aspect of the present application provides a motor, comprising:

[0005] A first shell defines a first accommodating cavity, and the first shell is provided with a first hole;

[0006] A stator is arranged in the first accommodating cavity;

[0007] A rotor is arranged in the first accommodating cavity and located in the stator, the rotor comprises a first end portion, the first end portion passes through the first shell and is used for outputting torque to the outside, and the first hole is arranged on the wall portion of the first shell close to the side of the first end portion;

[0008] A circuit board is arranged in the first accommodating cavity, and the circuit board is located on the side of the rotor away from the first end portion;

[0009] Wherein, the rotor is provided with a flow guide structure located in the first accommodating cavity, and the flow guide structure is configured to drive the first fluid entering the first accommodating cavity through the first hole when the flow guide structure rotates with the rotation of the rotor, so that the first fluid flows to the position in contact with the circuit board.

[0010] The second aspect of the present application also provides a driving system, comprising:

[0011] The motor of any one of the above;

[0012] A pump comprising a second shell defining a second accommodating cavity, the second shell is provided with a fluid inlet and a fluid outlet respectively communicating with the second accommodating cavity, the pump is connected with the first end portion and is used for sucking the supply fluid into the second accommodating cavity through the fluid inlet after obtaining the driving force from the first end portion and then guiding the supply fluid out of the second accommodating cavity through the fluid outlet.

[0013] The third aspect of the present application also provides a driving system comprising a motor and a pump;

[0014] The motor comprises:

[0015] a first shell defining a first accommodating cavity, the first shell comprising an end wall provided with a first hole;

[0016] a rotor arranged in the first accommodating cavity, the rotor comprising a first end portion penetrating through the end wall; and

[0017] a temperature sensor arranged in the first accommodating cavity,

[0018] wherein the rotor is provided with a flow guide structure located in the first accommodating cavity, the flow guide structure being configured to drive the first fluid entering the first accommodating cavity from the first hole to flow to a position in contact with the temperature sensor when the flow guide structure rotates with the rotation of the rotor.

[0019] a pump connected with the first end portion, the pump being configured to draw the first fluid and then guide the first fluid out after obtaining driving force from the first end portion, and the driving system being configured to enable a part of the first fluid to flow to the first hole before entering the pump.

[0020] The motor provided by the embodiment of the present application has the first hole formed on the first shell, so that the first fluid can enter the first shell from the first hole. The motor further comprises a circuit board used at least for driving the rotation of the rotor. The rotor is provided with the flow guide structure located in the first shell. When the rotor rotates, the flow guide structure can drive the first fluid entering the first shell from the first hole to flow in the direction of the circuit board and finally flow to a position in contact with the circuit board. After the first fluid contacts the circuit board, the first fluid can absorb the heat on the circuit board, thereby cooling the circuit board, prolonging the service life of the circuit board and improving the safety performance of the circuit board. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present application.

[0022] Figure 1 is a full cross-sectional schematic view of a motor provided by an embodiment of the present application;

[0023] Figure 2 is a bottom view schematic view of a motor provided by an embodiment of the present application;

[0024] Figure 3 is a three-dimensional schematic view of a rotor provided by an embodiment of the present application;

[0025] Figure 4 is an exploded schematic view of a rotor provided by an embodiment of the present application;

[0026] Figure 5 is a structural schematic diagram of an electric machine provided by an embodiment of the present application;

[0027] Figure 6 is a full-section schematic diagram of a driving system provided by an embodiment of the present application;

[0028] Figure 7 is a three-dimensional schematic diagram of a first perspective of a full-section view of a driving system provided by an embodiment of the present application;

[0029] Figure 8 is a three-dimensional schematic diagram of a second perspective of a full-section view of a driving system provided by an embodiment of the present application;

[0030] Figure 9 is an exploded schematic diagram of a driving system provided by an embodiment of the present application;

[0031] Figure 10 is a bottom view schematic diagram of a driving system provided by an embodiment of the present application.

[0032] Reference signs: 10, device; 100, electric machine; 110, first shell; 111, end wall; 112, first hole; 113, second hole; 120, rotor; 121, rotating shaft; 1211, first end portion; 1212, second end portion; 122, rotor core; 123, flow guide channel; 123a, first flow guide channel; 123b, second flow guide channel; 1231, first port; 1232, second port; 130, stator; 140, circuit board; 141, temperature sensor; 150, first accommodating cavity; 160, backflow channel; 200, pump; 210, second shell; 211, pump shell; 212, end cover; 213, fluid inlet; 214, fluid outlet; 215, first flow passage; 216, second flow passage; 220, first gear; 230, second gear; 240, second accommodating cavity. DETAILED DESCRIPTION

[0033] In order to facilitate the understanding of the present application, the present application will be described in more detail below in conjunction with the drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element or one or more intervening elements can be present therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element or one or more intervening elements can be present therebetween. The terms "vertical", "horizontal", "left", "right", and similar expressions used in the present specification are for illustrative purposes only.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. All publications, patent applications, patents, figures, and other references mentioned in this specification are herein incorporated by reference in their entirety for the teachings relevant to the sentence in which the reference is presented.

[0035] Electric machines are common driving devices. An electric machine includes a housing, a stator, a rotor and a circuit board. The stator, the rotor and the circuit board are disposed in the housing, and the rotor is rotatable relative to the stator to deliver power to the outside, and the circuit board is at least used to control the rotation of the rotor. The working temperature of the circuit board of the existing electric machine is too high, and it is difficult to effectively cool it.

[0036] In view of this, referring to Figures 1-5 , the present embodiment provides an electric machine 100, which includes a first housing 110, a rotor 120, a stator 130 and a circuit board 140.

[0037] Referring to Figure 1 and Figure 3 , the first housing 110 defines a first accommodating cavity 150, and the rotor 120, the stator 130 and the circuit board 140 are all disposed in the first accommodating cavity 150. The first housing 110 is provided with a first hole 112, and a first fluid can enter the first accommodating cavity 150 of the first housing 110 through the first hole 112. The first fluid can be a gas, a liquid or a combination of the two. In the present embodiment, the first fluid is a liquid.

[0038] In the present embodiment, the rotor 120 is disposed inside the stator 130, the stator 130 is fixed in position relative to the first housing 110, and the rotor 120 is rotatable relative to the stator 130. The rotor 120 includes a first end portion 1211 and a second end portion 1212 which are distributed in opposite directions along the axial direction of the electric machine 100. The first end portion 1211 of the rotor 120 penetrates the first housing 110 and is used to output torque to the outside, and an external device (such as a pump 200) can obtain driving force by connecting with the first end portion 1211 of the rotor 120.

[0039] In the present embodiment, the rotor 120 can specifically include a rotating shaft 121 and a rotor core 122, the rotating shaft 121 penetrates the rotor core 122, and the rotating shaft 121 includes the first end portion 1211 and the second end portion 1212. The rotating shaft 121 can only the first end portion 1211 penetrate the first housing 110, or both the first end portion 1211 and the second end portion 1212 penetrate the first housing 110. In the present embodiment, only the first end portion 1211 of the rotating shaft 121 penetrates the first housing 110, and the second end portion 1212 of the rotating shaft 121 is located in the first housing 110.

[0040] In the embodiment, the first hole 112 on the first shell 110 is arranged on the wall of the first shell 110 close to the first end 1211 (relative to the second end 1212). In other words, the first hole 112 is arranged closer to the first end 1211, and the distance between the first hole 112 and the first end 1211 is less than the distance between the first hole 112 and the second end 1212.

[0041] The circuit board 140 is electrically connected with the stator 130, and the circuit board 140 controls the rotation of the rotor 120 by controlling the current flowing through the winding of the stator 130. The circuit board 140 can be arranged at any position in the first accommodating cavity 150 according to actual needs. In the embodiment, referring to Figure 1 , the circuit board 140 is arranged on the side of the rotor 120 away from the first end 1211, and specifically, the circuit board 140 is arranged adjacent to the side of the second end 1212 of the rotor 120. In other embodiments, the second end 1212 of the rotor 120 can also pass through the circuit board 140.

[0042] In particular, the rotor 120 is provided with a flow guide structure in the first accommodating cavity 150, and the rotor 120 forms the flow guide structure. The flow guide structure is configured to drive the first fluid entering the first accommodating cavity 150 through the first hole 112 when the flow guide structure rotates with the rotation of the rotor 120, so that the first fluid flows to a position in contact with the circuit board 140. In other words, when the rotor 120 rotates, the flow guide structure also rotates, and the rotation of the flow guide structure can generate a driving force to drive the first fluid, so that the first fluid flows to the circuit board 140 in the direction close to the circuit board 140. The first fluid in contact with the circuit board 140 can exchange heat with the circuit board 140, thereby removing the heat on the circuit board 140.

[0043] The flow guide structure can be a solid structure (for example, the flow guide structure can be a fan blade fixed to the rotating shaft 121 or a fan blade capable of linkage with the rotating shaft 121), or a virtual structure such as a hole or a groove. In the embodiment, the flow guide structure is a channel (which can be a flow guide channel 123 described below) arranged on the rotor 120. When the rotor 120 rotates, the channel as the flow guide structure also rotates, and the rotation of the channel can drive the first fluid in the channel to flow, thereby generating a driving force for the first fluid.

[0044] The motor 100 provided in this embodiment has a first hole 112 in the first housing 110, allowing a first fluid to enter the first housing 110 through the first hole 112. The motor 100 also includes a circuit board 140, which is used to drive the rotation of the rotor 120. The rotor 120 has a flow guiding structure located inside the first housing 110. When the rotor 120 rotates, the flow guiding structure, following the rotation, drives the first fluid entering the first housing 110 through the first hole 112 to flow towards the circuit board 140, and eventually to a position where it can contact the circuit board 140. After the first fluid contacts the circuit board 140, it can absorb heat from the circuit board 140, thereby cooling the circuit board 140, extending its service life, and improving its safety performance.

[0045] When the circuit board 140 is disposed on the side where the second end 1212 of the rotor 120 is located, the circuit board 140 and the first hole 112 are respectively located on opposite sides of the rotor 120. To ensure that the first fluid can smoothly reach the position in contact with the circuit board 140, in this embodiment, see... Figure 1 , Figure 3 as well as Figure 4 The rotor 120 is provided with a flow guide channel 123, which extends through the rotor 120 along its axial direction. The flow guide channel 123 allows the first fluid entering the first receiving cavity 150 through the first hole 112 to pass through and reach the position contacting the circuit board 140. That is, the first fluid located near the first end 1211 can pass through the flow guide channel 123 through the rotor 120 to reach a position away from the first end 1211, thereby achieving contact with the circuit board 140. The flow guide channel 123 makes the flow of the first fluid smoother, increasing the flow rate of the first fluid in contact with the circuit board 140. In other embodiments, the first fluid can also pass through the gap between the rotor 120 and the stator 130 to achieve the purpose of passing through the rotor 120 and contacting the circuit board 140.

[0046] The specific structure of the flow guiding channel 123 depends on the requirements; it only needs to be able to guide the first fluid on both sides of the rotor 120. In this embodiment, specifically, the flow guiding structure includes the flow guiding channel 123. In other words, the flow guiding channel 123 in this embodiment is used both to guide the first fluid on both sides of the rotor 120 and to drive the first fluid when the rotor 120 rotates. See details below. Figure 4, the flow guide passage 123 has a first port 1231 located close to the first end 1211 and a second port 1232 away from the first end 1211, the first port 1231 is offset from the second port 1232 in the axial direction of the motor 100, and the flow guide passage 123 is configured such that, when the rotor 120 rotates, the wall of the flow guide passage 123 can give the first fluid a pressure to flow in the direction close to the circuit board 140. In this embodiment, the flow guide passage 123 has a simple structure, is easy to process, and has low cost. In other embodiments, the motor 100 can additionally provide other flow guide structures to drive the first fluid (for example, a fan blade provided at the connection of the rotor shaft 121), so that the flow guide passage 123 is only used to guide the first fluid on both sides of the rotor 120. At this time, the axis of the flow guide passage 123 can be arranged parallel to the rotation axis of the rotor 120.

[0047] In this embodiment, the axis of the flow guide passage 123 can extend in a straight line, and the axis of the flow guide passage 123 is inclined relative to the rotation axis. The wall of the flow guide passage 123 extending obliquely can generate a driving force to guide the first fluid to the circuit board 140. Preferably, the axis of the flow guide passage 123 is inclined in the circumferential direction of the rotor 120.

[0048] Specifically, the flow guide passage 123 can satisfy at least one of the following conditions a) - c): a), the flow guide passage 123 is provided on the rotor core 122; b), the flow guide passage 123 is provided on the rotor shaft 121; c), the outer peripheral wall of the rotor shaft 121 is provided with a first groove, and the inner peripheral wall of the rotor core 122 is provided with a second groove, and the first groove and the second groove jointly define the flow guide passage 123. In other words, in a), the flow guide passage 123 can be completely provided on the rotor core 122, at this time, the flow guide passage 123 can be provided inside the rotor core 122, can be provided on the outer peripheral wall of the rotor core 122, or can be provided on the inner peripheral wall of the rotor core 122. In b), the flow guide passage 123 can be completely provided on the rotor shaft 121, at this time, the flow guide passage 123 can be located inside the rotor shaft 121, or the flow guide passage 123 can be located on the outer peripheral wall of the rotor shaft 121 (the flow guide passage 123 is exposed on the outer peripheral wall of the rotor shaft 121). In c), the flow guide passage 123 can be partially provided on the rotor shaft 121 and partially provided on the rotor core 122, and the first groove on the rotor shaft 121 and the second groove on the rotor core 122 jointly combine to form the flow guide passage 123.

[0049] Specifically, in this embodiment, referring to Figure 3 and Figure 4The flow guide channel 123 includes a first flow guide channel 123a and a second flow guide channel 123b. The first flow guide channel 123a is completely arranged on the rotating shaft 121 and located on the outer peripheral wall of the rotating shaft 121. The rotating shaft 121 and the inner peripheral wall of the rotor core 122 jointly define the first flow guide channel 123a. The second flow guide channel 123b is completely arranged on the rotor core 122. In this embodiment, the second flow guide channel 123b is arranged inside the rotating shaft 121, and the second flow guide channel 123b penetrates the top surface and the bottom surface of the rotor core 122. The axes of the two types of flow guide channels (123a, 123b) extend along a straight line and are inclined relative to the rotation axis of the rotor 120. By arranging the two types of flow guide channels (123a, 123b) at different distances from the rotation axis of the rotor 120, the different positions of the rotor 120 relative to the rotation axis can be efficiently guided to the first fluid, and the guiding effect of the first fluid is better.

[0050] In this embodiment, the rotor 120 is provided with three first flow guide channels 123a, which are uniformly arranged around the rotation axis of the rotor 120. The rotor 120 is also provided with four second flow guide channels 123b, which are uniformly arranged around the rotation axis of the rotor 120. By uniformly arranging a plurality of first flow guide channels 123a and second flow guide channels 123b, on the one hand, the flow of the first fluid can be improved, and on the other hand, the first fluid can flow more uniformly to the side of the rotor 120 away from the first end portion 1211, so that the heat exchange between the circuit board 140 and the first fluid is more uniform, and the heat exchange effect of the circuit board 140 is better.

[0051] In this embodiment, the stator 130 and the first shell 110 jointly define a return flow channel 160 for the first fluid located on the side away from the first end portion 1211 to flow back to the side close to the first end portion 1211. That is, after the first fluid passes through the flow guide channel 123 to the side of the rotor 120 away from the first end portion 1211, it can flow back to the side of the rotor 120 close to the first end portion 1211 through the return flow channel 160, so that the first fluid can form a loop in the motor 100, improving the heat exchange effect of the first fluid. In other embodiments, the first fluid can also flow back to the side of the rotor 120 close to the first end portion 1211 through other channels additionally arranged, or flow back to the side close to the first end portion 1211 through the gap between the rotor 120 and the stator 130, which is not described here.

[0052] Referring to Figures 1-2In the embodiment, the wall part of the first shell 110 close to the first end part 1211 is provided with a second hole 113, and the second hole 113 is used to guide the first fluid in the first accommodating cavity 150 out. That is, the first fluid enters the first accommodating cavity 150 through the first hole 112, and then flows from the position close to the first end part 1211 of the rotor 120 to the position away from the first end part 1211 of the rotor 120. After the first fluid exchanges heat with the circuit board 140, the first fluid can flow back to the position close to the first end part 1211 of the rotor 120 through the backflow channel 160, and then is guided out of the first accommodating cavity 150 through the second hole 113. This scheme can make the first fluid take the heat generated by the circuit board 140 out of the first accommodating cavity 150 of the motor 100, thereby further improving the heat dissipation effect of the circuit board 140. In other embodiments, the first fluid can also be self-circulated in the first accommodating cavity 150.

[0053] In the embodiment, referring to Figure 2 , the first shell 110 includes an end wall 111 at one axial end thereof, the first end part 1211 penetrates through the end wall 111, and the first hole 112 and the second hole 113 are both arranged on the end wall 111. This scheme makes the first fluid be guided into or out of the first accommodating cavity 150 in substantially the same direction, and the first fluid is more convenient to guide in or out. In other embodiments, the first hole 112 and the second hole 113 can also be arranged on different wall parts of the first shell 110, which will not be described here.

[0054] In the embodiment, the circuit board 140 includes a temperature sensor 141, and the temperature sensor 141 is arranged at a position of the circuit board 140 capable of contacting the first fluid, and the temperature sensor 141 is used to sense the temperature of the first fluid. In this scheme, by sensing the temperature of the first fluid, the parameters of the first fluid can be adjusted correspondingly, for example, the flow of the first fluid or the temperature of the first fluid entering the first accommodating cavity 150 through the first hole 112 can be adjusted, thereby further improving the heat dissipation effect of the circuit board 140. For example, when the temperature sensor 141 senses that the temperature of the first fluid is too high, the temperature of the first fluid entering the first accommodating cavity 150 through the first hole 112 can be intelligently reduced. Other effects of sensing the temperature of the first fluid are described below.

[0055] The temperature sensor 141 can be arranged at a position of the circuit board 140 capable of contacting the first fluid. In the embodiment, referring to Figure 5 , the temperature sensor 141 is arranged on the wall surface of the circuit board 140 facing the first hole 112. This scheme makes the first fluid contact the temperature sensor 141 directly after passing through the flow guide channel 123, which is more convenient for the temperature sensor 141 to sense. In other embodiments, the temperature sensor 141 can also be arranged on the side of the circuit board 140 away from the rotor 120, which will not be described here.

[0056] Referring to Figure 5 In this embodiment, the motor 100 is provided with a passage enabling the first fluid to flow to the side of the circuit board 140 away from the first hole 112, so that the first fluid can flow to the wall surface in contact with the circuit board 140 away from the first hole 112. In this way, the entire circuit board 140 can exchange heat with the first fluid, and the heat dissipation effect of the circuit board 140 is better. The first fluid can flow to the side of the circuit board 140 away from the rotor 120 through the gap between the circuit board 140 and the first shell 110. In other embodiments, a hole can also be opened on the circuit board 140 to facilitate the flow of the first fluid to the side away from the rotor 120, which will not be described here.

[0057] Referring to Figures 6-10 The application also provides a drive system 10, which comprises the motor 100 of any of the above embodiments. In particular, the drive system 10 further comprises a pump 200. The pump 200 comprises a second shell 210 defining a second accommodating cavity 240, and the second shell 210 is provided with a fluid inlet 213 and a fluid outlet 214 respectively communicating with the second accommodating cavity 240. The pump 200 is connected with the first end portion 1211 of the rotor 120 of the motor 100 and is used to suck the supply fluid from the fluid inlet 213 after obtaining the driving force from the first end portion 1211. The drive system 10 is configured to enable the supply fluid flowing through the fluid inlet 213 to be divided into the first fluid and the second fluid, and the second fluid flows into the second accommodating cavity 240 and is guided out of the second accommodating cavity 240 by the fluid outlet 214. That is, the pump 200 can obtain the power of the motor 100 to drive the flow of the second fluid.

[0058] The second fluid can be of the same material as the first fluid or not. When the materials of the first fluid and the second fluid are the same, the first fluid and the second fluid are stored in the same oil tank, or can be stored in two different oil tanks. When the first fluid and the second fluid are stored in different oil tanks, the annular passage of the first fluid and the annular passage of the second fluid are isolated from each other. In this embodiment, the first fluid and the second fluid are of the same material. And the first fluid and the second fluid are stored in the same oil tank, that is, the annular passage of the first fluid and the annular passage of the second fluid are in communication.

[0059] In this embodiment, the second shell 210 is at least partially integrally connected with the first shell 110. In this scheme, on the one hand, the connection between the first shell 110 and the second shell 210 is more stable, and on the other hand, the machining steps can be reduced and the machining cost can be reduced. In other embodiments, the first shell 110 can also be arranged independently of the second shell 210, that is, the motor 100 and the pump 200 are only connected through the first end portion 1211 of the rotor 120.

[0060] Specifically, the second shell 210 cooperates with the end wall 111 to define a second accommodating cavity 240, so as to reduce the distance between the motor 100 and the pump 200, thereby shortening the length of the rotating shaft 121 of the rotor 120; on the other hand, the second shell 210 can reduce the number of parts for defining the second accommodating cavity 240, thereby reducing the material cost of the drive system 10.

[0061] With reference to Figure 6 In the embodiment, the second shell 210 further defines a first flow channel 215, which is isolated from the second accommodating cavity 240 and is in communication with the first hole 112. The fluid inlet 213 is in communication with the second accommodating cavity 240 in part and is in communication with the first flow channel 215 in part. The supply fluid flows in through the fluid inlet 213, and the drive system 10 is configured to split the supply fluid flowing through the fluid inlet 213 into a first fluid and a second fluid, the first fluid being guided to the first hole 112 through the first flow channel 215, and the second fluid being guided to the second accommodating cavity 240. In other words, the supply fluid is split at the fluid inlet 213, part of which is guided to the first accommodating cavity 150 in the motor 100 through the first flow channel 215, and part of which is guided to the second accommodating cavity 240 in the pump 200.

[0062] It should be noted that in the embodiment, the first fluid and the second fluid are stored in one oil tank and are of the same material, both of which belong to the supply fluid. The different names are only used to distinguish the different arrangement positions of the fluids. That is, the fluid arranged before the drive system 10 from the oil tank is the supply fluid, the fluid split into the pump 200 is the second fluid, and the fluid split into the motor 100 is the first fluid.

[0063] In the embodiment, the first flow passage 215 is defined by the second shell 210 and communicates with the first hole 112. On one hand, the bifurcated pipe is not needed to connect the fluid inlet 213 and the first hole 112, and the shunt pipe is saved. On the other hand, the temperature of the first fluid flowing into the motor 100 can be sensed by the temperature sensor 141, and the first fluid contacts the temperature sensor 141 by passing through the flow guide passage 123 on the rotor 120. The temperature of the first fluid is not affected by the temperature of the stator 130 of the motor 100, so that the temperature of the first fluid contacting the temperature sensor 141 can basically reflect the temperature of the second fluid entering the pump 200. Therefore, the parameters of the pump 200 can be adjusted according to the temperature sensed by the temperature sensor 141. For example, when the pump 200 is a cooling pump, if the temperature sensed by the temperature sensor 141 is too high, it proves that the temperature of the second fluid entering the pump 200 is too high, and the speed of the pump 200 can be appropriately increased to accelerate the flow of the oil in the oil tank and be cooled by the external radiator circuit. When the temperature exceeds the limit value, the temperature sensor 141 feeds back to the controller, and the controller can make derating protection according to the actual demand.

[0064] Referring to Figures 8-9 In the embodiment, the second shell 210 further defines a second flow passage 216, which is isolated from the first flow passage 215 and the second accommodating cavity 240. One end of the second flow passage 216 communicates with the second hole 113, and the other end communicates with the fluid outlet 214. The first fluid in the first accommodating cavity 150 can flow out of the drive system 10 through the second flow passage 216 and the fluid outlet 214. In this scheme, the drive system 10 as a whole has only the fluid outlet 214 to guide the fluid out, so that the number of external openings of the drive system 10 as a whole can be reduced, and the drive system 10 can only need a single pipe to guide all the internal fluids out.

[0065] In other embodiments, the second hole 113 can also communicate with the second accommodating cavity 240, so that the first fluid guided out of the second hole 113 can be guided out of the drive system 10 through the second accommodating cavity 240 and the fluid outlet 214. In this scheme, not only the number of external openings of the drive system 10 as a whole can be reduced, but also the pump 200 can give the first fluid the power to flow out of the first accommodating cavity 150, and the flowability of the first fluid is improved. Specifically, the second accommodating cavity 240 has a negative pressure area communicating with the fluid inlet 213 and a positive pressure area communicating with the fluid outlet 214, and the second hole 113 communicates with the negative pressure area. That is, the pump 200 can suck the first fluid in the first accommodating cavity 150 into the second accommodating cavity 240 through the second hole 113, and then the first fluid can be discharged from the fluid outlet 214.

[0066] The pump 200 can be a rotor pump, referring to Figures 8-9In the embodiment, the first end 1211 of the rotor 120 is connected with the first gear 220, the first gear 220 obtains driving force from the first end 1211 of the rotor 120 and rotates relative to the second gear 230, thereby generating power for driving the second fluid.

[0067] Specifically, referring to Figures 7-9 In the embodiment, the second shell 210 includes a pump shell 211 and an end cover 212, the pump shell 211 is integrally formed with the first shell 110, the end cover 212 is connected to the pump shell 211 away from the motor 100, a fluid inlet 213 and a fluid outlet 214 are arranged on the end cover 212. That is, in the embodiment, the first shell 110 includes an end wall 111, the first end 1211 passes through the end wall 111, the first hole 112 is arranged on the end wall 111, one end of the pump shell 211 is connected to the end wall 111, and the other end is connected to the end cover 212, the end wall 111, the first gear 220, the second gear 230 and the end cover 212 jointly define a second accommodating cavity 240. The pump shell 211 is arranged around the outer periphery of the second gear 230. The pump shell 211, the second gear 230, the end wall 111 and the end cover 212 jointly define a first flow channel 215 and a second flow channel 216. One end of the first flow channel 215 is communicated with the fluid inlet 213, and the other end is communicated with the first hole 112. One end of the second flow channel 216 is communicated with the fluid outlet 214, and the other end is communicated with the second hole 113.

[0068] The application further provides a driving system 10, which comprises a motor 100 and a pump 200. The motor 100 comprises a first shell 110, a stator 130, a rotor 120 and a circuit board 140. The first shell 110 defines a first accommodating cavity 150, and comprises an end wall 111 provided with a first hole 112. The rotor 120 is arranged in the first accommodating cavity 150 and comprises a first end portion 1211 penetrating through the end wall 111. The circuit board 140 is arranged in the first accommodating cavity 150 and is used at least for controlling rotation of the rotor 120, and comprises a temperature sensor 141. The rotor 120 is provided with a flow guide structure in the first accommodating cavity 150, which is configured to drive a first fluid entering the first accommodating cavity 150 through the first hole 112 to flow to a position in contact with the temperature sensor 141 when the flow guide structure rotates with the rotor 120. The pump 200 is connected with the first end portion 1211 and is configured to suck the first fluid and then guide the first fluid out after obtaining driving force from the first end portion 1211 of the rotor 120. The driving system 10 is configured to enable a part of the first fluid to flow to the first hole 112 before entering the pump 200. In the embodiment, the temperature sensed by the temperature sensor 141 in the motor 100 can basically reflect the temperature of the fluid flowing into the pump 200, so that the parameters of the pump 200 can be adjusted according to the temperature sensed by the temperature sensor 141 in the pump 200, thereby improving the intelligence of the driving system 10.

[0069] It should be noted that the preferred embodiments of the application are given in the specification and drawings of the application, but the application can be implemented in many different forms, and is not limited to the embodiments described in the specification. These embodiments are not additional limitations on the content of the application, and the purpose of providing these embodiments is to make the disclosure of the application more thorough and comprehensive. Furthermore, the above technical features continue to be combined with each other to form various embodiments not listed above, which are all considered to be within the scope of the application. Furthermore, for those skilled in the art, the above description can be improved or changed, and all these improvements and changes should be within the scope of protection of the appended claims.

Claims

1. An electric machine characterized in that, The motor comprises: a first shell defining a first accommodating cavity, the first shell being provided with a first hole; a stator arranged in the first accommodating cavity; a rotor arranged in the first accommodating cavity and located in the stator, the rotor comprising a first end portion penetrating through the first shell and configured to output torque to the outside, the first hole being arranged on a wall portion of the first shell located at a side close to the first end portion; a circuit board arranged in the first accommodating cavity, the circuit board being located at a side of the rotor away from the first end portion; wherein the rotor is provided with a flow guide structure located in the first accommodating cavity, the flow guide structure being configured to drive the first fluid entering the first accommodating cavity through the first hole to flow to a position in contact with the circuit board when the flow guide structure rotates with the rotation of the rotor; the rotor comprises a rotor shaft and a rotor core sleeved outside the rotor shaft, the rotor shaft comprises the first end portion, and the flow guide structure comprises a flow guide channel, the flow guide channel satisfying at least one of the following conditions: the flow guide channel is arranged in the rotor core; an outer peripheral wall of the rotor shaft is provided with a first groove, an inner peripheral wall of the rotor core is provided with a second groove, and the first groove and the second groove jointly define the flow guide channel.

2. The motor of claim 1, wherein: the flow guide structure comprises a flow guide channel penetrating through the rotor along an axial direction of the rotor, the flow guide channel being configured to allow the first fluid entering the first accommodating cavity through the first hole to pass through and reach the position in contact with the circuit board.

3. The motor of claim 1, wherein: the flow guide structure comprises a flow guide channel having a first opening located close to the first end portion and a second opening located away from the first end portion, the first opening being offset from the second opening when viewed along an axial direction of the motor, and the flow guide channel being configured such that, when the rotor rotates, a wall portion of the flow guide channel can give the first fluid a pressure in a direction close to the circuit board.

4. The motor of claim 2, wherein: an axis of the flow guide channel extends in a straight line, and the axis is inclined relative to a rotation axis.

5. The motor of claim 1, wherein: the circuit board comprises a temperature sensor arranged at a position of the circuit board capable of contacting the first fluid, the temperature sensor being configured to sense a temperature of the first fluid; and the temperature sensor is arranged on a wall surface of the circuit board facing the first hole.

6. The motor of claim 1, wherein: the motor is provided with a passage allowing the first fluid to flow to a side of the circuit board away from the first hole, so that the first fluid can flow to a wall surface of the circuit board away from the first hole; the wall portion of the first shell close to the first end portion is provided with a second hole configured to guide the first fluid in the first accommodating cavity out of the first accommodating cavity; and the first shell comprises an end wall, the first end portion penetrates through the end wall, and the first hole and the second hole are both arranged on the end wall.

7. A drive system characterized by, ​ The electric machine of any one of claims 1-5; The pump comprises a second housing defining a second accommodating cavity, the second housing being provided with a fluid inlet and a fluid outlet respectively communicating with the second accommodating cavity, the pump being connected with the first end portion and configured to draw the supply fluid into the second accommodating cavity from the fluid inlet and then guide the supply fluid out of the second accommodating cavity from the fluid outlet after obtaining driving force from the first end portion.

8. The drive system of claim 7, wherein the first housing comprises an end wall through which the first end portion passes, and the first hole is provided on the end wall; the second housing cooperates with the end wall to define the second accommodating cavity.

9. The drive system of claim 8, wherein the second housing further defines a first flow channel which is isolated from the second accommodating cavity and which communicates with the first hole; a portion of the fluid inlet communicates with the second accommodating cavity, and another portion of the fluid inlet communicates with the first flow channel; the supply fluid flows into the fluid inlet, and the drive system is configured to split the supply fluid flowing through the fluid inlet into the first fluid and the second fluid, the first fluid being guided to the first hole via the first flow channel, and the second fluid being guided to the second accommodating cavity.

10. The drive system of claim 9, wherein the first housing is provided with a second hole near a wall portion of the first end portion, the second hole being configured to guide the first fluid in the first accommodating cavity out of the first accommodating cavity; the second housing further defines a second flow channel which is isolated from the first flow channel and the second accommodating cavity, one end of the second flow channel communicating with the second hole, and the other end of the second flow channel communicating with the fluid outlet.

11. A drive system characterized by, The drive system comprises an electric machine and a pump; The electric machine comprises: a first housing defining a first accommodating cavity, the first housing comprising an end wall provided with a first hole; a rotor provided in the first accommodating cavity, the rotor comprising a first end portion passing through the end wall; and a temperature sensor provided in the first accommodating cavity, wherein the rotor is provided with a flow guide structure in the first accommodating cavity, the flow guide structure being configured to drive the first fluid entering the first accommodating cavity from the first hole to flow to a position in contact with the temperature sensor when the flow guide structure rotates with the rotation of the rotor; the pump is connected with the first end portion, and the pump is configured to draw the first fluid and then guide the first fluid out of the pump after obtaining driving force from the first end portion, and the drive system is configured to enable a portion of the first fluid to flow to the first hole before entering the pump; the rotor comprises a rotor shaft and a rotor core sleeved outside the rotor shaft, the rotor shaft comprises the first end portion, and the flow guide structure comprises a flow guide passage, the flow guide passage satisfying at least one of the following conditions: the flow guide passage is provided in the rotor core; an outer peripheral wall of the rotor shaft is provided with a first groove, and an inner peripheral wall of the rotor core is provided with a second groove, the first groove and the second groove cooperatively defining the flow guide passage.

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