CN117879262A

CN117879262A - Suspension motor, motor cooling system, cooling control method of motor cooling system and vehicle

Info

Publication number: CN117879262A
Application number: CN202410273244.0A
Authority: CN
Inventors: 孙宪猛; 张秀和; 李豪; 李家洪; 梁慧康
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2024-03-11
Filing date: 2024-03-11
Publication date: 2024-04-12
Anticipated expiration: 2044-03-11
Also published as: CN117879262B

Abstract

The invention discloses a suspension motor, a motor cooling system, a cooling control method of the motor cooling system and a vehicle. The levitation motor includes: a first portion including a core and a first magnetic member provided on the core; a second portion including a housing and a second magnetic member, the housing including a housing peripheral wall surrounding an outside of the core, the second portion being movable in a first direction relative to the first portion; the cooling structure comprises a first liquid cooling loop and a second liquid cooling loop, at least part of the first liquid cooling loop is arranged on the first part, and at least part of the second liquid cooling loop is arranged on the peripheral wall of the shell. The cooling structure of the suspension motor adopts the combination setting of the first liquid cooling loop and the second liquid cooling loop, thereby being beneficial to reducing the processing difficulty while guaranteeing the cooling effect of the cooling structure. After the temperature rise of the suspension motor is effectively controlled through the cooling structure, the running efficiency and the working stability of the suspension motor can be improved.

Description

Suspension motor, motor cooling system, cooling control method of motor cooling system and vehicle

Technical Field

The invention relates to a motor cooling structure, in particular to a suspension motor, a motor cooling system, a cooling control method of the motor cooling system and a vehicle.

Background

With the development of electric vehicles, the demand for riding comfort of the vehicle by passengers is increasing, and electromagnetic active suspensions are receiving attention. Currently, most electromagnetic active suspension actuators adopt a combination of a rotating motor and a mechanical structure, and in the combination, the rotating motion output by the rotating motor is converted into linear motion acting on a vehicle body through the mechanical structure. However, this arrangement, due to the addition of the mechanical structure, makes the actuator less efficient and complicated and thus inconvenient to install, so that the active suspension system gradually adopts the suspension motor as its actuator.

When the vehicle is in a vibration state during running, the coil in the suspension motor is always in a working state, the coil generates heat seriously, the action efficiency of the suspension motor actuator can be influenced if heat is not timely dissipated, and the suspension motor related to the active suspension actuator generally adopts a natural cooling mode at present, so that the cooling speed is slower.

Not only is the suspension motor used on the vehicle so, but also suspension motors used in other fields are cooled in a natural cooling mode. Once the suspension motor is overheated, the operation efficiency and the insulating property of the device can be affected, and even the motor is burnt out.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention aims to provide a suspension motor which is convenient for increasing the heat exchange area of cooling liquid and processing.

The invention also aims to provide a motor cooling system comprising the suspension motor and a cooling control method thereof.

The invention also aims to provide a vehicle comprising the suspension motor or the motor cooling system.

According to an embodiment of the first aspect of the present invention, a levitation motor includes: a first portion including a core and a first magnetic member provided on the core, the core being disposed along a first direction; a second portion including a housing and a second magnetic member provided on the housing, the housing including a housing peripheral wall surrounding an outside of the core, the second portion being movable in the first direction with respect to the first portion; the cooling structure comprises a first liquid cooling loop and a second liquid cooling loop, at least part of the first liquid cooling loop is arranged on the first part, and at least part of the second liquid cooling loop is arranged on the shell peripheral wall.

According to the suspension motor provided by the embodiment of the first aspect of the invention, the cooling structure is arranged by adopting the combination of the first liquid cooling loop and the second liquid cooling loop, so that the cooling effect of the cooling structure is ensured, and the processing difficulty is reduced conveniently.

Wherein, because the shell perisporium surrounds first magnetic part and second magnetic part, the heat that first magnetic part and second magnetic part produced is when outwards radiating, and shell perisporium inner peripheral surface area is big, and the radiation heat that the shell perisporium received is many and the heat radiation path is short. This makes the second liquid cooling circuit absorb heat through the shell perisporium, and the heat absorption route is short, and heat absorption efficiency is high. The second liquid cooling loop is arranged on the peripheral wall of the shell to make up the defect of the first liquid cooling loop, and compared with the scheme of only arranging the first liquid cooling loop, the processing difficulty of the first part is greatly reduced. The shell body has enough rigidity and strength for protecting internal devices, and the second liquid cooling loop is arranged in enough space on the peripheral wall of the shell body and is not interfered by the weaker first magnetic part, so that the processing difficulty is lower.

After the temperature rise of the suspension motor is effectively controlled through the cooling structure, the running efficiency and the working stability of the suspension motor can be improved.

An electric motor cooling system according to an embodiment of the second aspect of the present invention includes: the levitation motor of the above embodiment; the radiator is connected with the cooling structure of the suspension motor to form a circulation loop of cooling liquid; and the power device is connected between the radiator and the cooling structure and is used for driving the cooling liquid to circularly flow in the circulation loop.

According to the motor cooling system provided by the embodiment of the invention, the cooling structure of the suspension motor can simultaneously cool the first magnetic part and the outer shell in the suspension motor, the radiator is introduced outside the circulation loop, and the heat from the suspension motor is taken away through the flow of the cooling liquid, so that the outward heat dissipation capacity of the suspension motor is enhanced. Through the arrangement of the power device, the cooling liquid cooled by the radiator can reenter the next circulation, and the sustainability of a circulation loop of the cooling liquid is realized.

According to a third aspect of the present invention, a cooling control method of a motor cooling system includes the steps of:

detecting the real-time temperature of a set position on the suspension motor;

when the real-time temperature is smaller than a first set temperature, controlling the power device to stop running;

and controlling the power device to operate when the real-time temperature is greater than or equal to the first set temperature.

According to the cooling control method of the motor cooling system, the running scheme of the motor cooling system can be determined according to the real-time temperature of the suspension motor, and the internal temperature of the suspension motor is ensured to reach a safe range. The control mode for determining the cooling operation by utilizing the real-time temperature has higher temperature control accuracy on the suspension motor, and can indicate that the internal temperature of the suspension motor is safer when the real-time temperature does not reach the first set temperature t, and the power device is controlled to stop operation at the moment, so that the operation energy consumption of the power device can be saved.

According to a fourth aspect of the present invention, a vehicle includes: a vehicle body; a frame arranged at the bottom of the vehicle body; the levitation motor of the above embodiment, or the motor cooling system of the above embodiment, wherein one of the core and the housing of the levitation motor is connected to the vehicle body, and the other of the core and the housing is connected to the vehicle frame.

According to the vehicle provided by the embodiment of the invention, the suspension motor is provided with the internal and external bidirectional liquid cooling heat dissipation, so that the cooling effect of the suspension motor is ensured, the running efficiency and the insulating performance of the suspension motor are ensured, and the stable running of the suspension motor can be maintained. The suspension motor is used as an active suspension to be installed on the vehicle, so that the running comfort of the vehicle is ensured.

Drawings

FIG. 1 is a cross-sectional view of a levitation motor in some embodiments of the invention;

FIG. 2 is a cross-sectional view of a levitation motor in further embodiments of the present invention;

FIG. 3 is a cross-sectional view taken along line G-G of FIG. 1;

FIG. 4 is a cross-sectional view of a levitation motor in still other embodiments of the present invention;

FIG. 5 is a cross-sectional view of a levitation motor in further embodiments of the present invention;

FIG. 6 is a block diagram of a motor cooling system in some embodiments of the invention;

FIG. 7 is a schematic diagram of the circulation circuit of the coolant of the embodiment of FIG. 6;

FIG. 8 is a block diagram of a motor cooling system in accordance with further embodiments of the present invention;

FIG. 9 is a control schematic of the motor cooling system in some embodiments shown in FIG. 8;

FIG. 10 is a schematic diagram of a cooling control flow of a motor cooling system in some embodiments of the invention;

FIG. 11 is a partial block diagram of some vehicles of the present invention;

FIG. 12 is a cooling control flow diagram of a motor cooling system in some specific examples of the invention;

fig. 13 is a cooling control flow chart of the motor cooling system in other specific examples of the invention.

Reference numerals:

a vehicle 1000;

a motor cooling system 100;

a levitation motor 1;

first portion 10, core 11, first duct 111, second duct 112, fitting groove 113, center hole 114, first magnetic member 12, central axis L1;

a second portion 20, a housing 21, a housing peripheral wall 211, a housing bottom wall 212, a center post 213, a fitting end 214, a second magnetic member 22, a buffer block 23;

a cooling structure 30;

a first liquid cooling circuit 31, an upstream branch 311, a downstream branch 312, and a middle branch 313;

a second liquid cooling circuit 32;

radiator 4, exhaust port 41, return port 42;

a power device 51 and a switch 52;

A liquid separating piece 61, a liquid inlet 611, a liquid separating port 612, a liquid combining piece 62 and a liquid storage pot 63;

a temperature detecting member 71, a processor 72, a controller 73;

a vehicle body 810, a frame 820, wheels 830.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that the terms "center," "length," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and simplify description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

The levitation motor 1 according to the embodiment of the first aspect of the present invention will be described with reference to fig. 1 to 5, and the application field of the levitation motor 1 is not limited and may be applied to vehicles, production apparatuses, etc.

The levitation motor 1 according to an embodiment of the present invention includes: a first portion 10, a second portion 20 and a cooling structure 30. The first portion 10 includes a core 11 and a first magnetic member 12 provided on the core 11, the core 11 being disposed along a first direction. Here, the first direction is the driving direction of the levitation motor 1. Typically, the core 11 is a column, and the first direction is the column length direction of the core 11. In some embodiments, the core 11 has a central axis L1, and the first direction is parallel to the central axis L1.

The second portion 20 includes a housing 21 and a second magnetic member 22 provided on the housing 21, the housing 21 including a housing peripheral wall 211 surrounding an outside of the core 11, the second portion 20 being movable in the first direction with respect to the first portion 10.

Here, one of the first portion 10 and the second portion 20 corresponds to a stator portion, and the other corresponds to a mover portion. As is well known to those skilled in the art, the first magnetic member 12 is one of a coil and a permanent magnet and the second magnetic member 22 is the other of a coil and a permanent magnet, that is, the coil and the permanent magnet are positioned opposite each other on the first portion 10 and the second portion 20. Taking the first magnetic element 12 as a coil and the second magnetic element 22 as a permanent magnet as an example, the second magnetic element 22 of the second portion 20 has a magnetic field, the first magnetic element 12 of the first portion 10 is located in the magnetic field, and after the first magnetic element 12 is energized with an alternating current, a thrust is generated between the first portion 10 and the second portion 20, so that the levitation motor 1 has a driving force along the first direction.

It will be appreciated that during operation of the levitation motor 1, the first magnetic member 12 may generate excessive heat and the second magnetic member 22 may also generate heat, resulting in a gradual increase in the temperature of the levitation motor 1. When the levitation motor 1 is overheated, the internal resistance increases, so that the efficiency and driving force of the levitation motor 1 are reduced. In some schemes, overheating of the suspension motor 1 not only affects the operation efficiency, but also affects the lubricity, insulation and the like, and the suspension motor is seriously possibly burnt out. In order to solve the above problems, the suspension motor 1 of the present invention is provided with a cooling structure 30.

Referring to fig. 1 and 2, the cooling structure 30 includes a first liquid cooling circuit 31 and a second liquid cooling circuit 32, at least a portion of the first liquid cooling circuit 31 is disposed on the first portion 10, and at least a portion of the second liquid cooling circuit 32 is disposed on the shell peripheral wall 211. Thus, the first liquid cooling circuit 31 can take a large amount of heat away from the core 11, which is beneficial to reducing the internal temperature of the levitation motor 1. The second liquid cooling circuit 32 can remove a large amount of heat from the shell peripheral wall 211, which is advantageous in lowering the external temperature of the levitation motor 1.

But the surrounding environment may also absorb heat from the second portion 20, for example, when there is an air flow, the flowing air can take away the heat of the second portion 20, causing the temperature of the housing 21 to drop back. After the temperature of the housing 21 is lowered, the internal heat is absorbed, thereby further lowering the internal temperature of the levitation motor 1.

The combined arrangement of the first liquid cooling loop 31 and the second liquid cooling loop 32 in the scheme of the invention is beneficial to reducing the processing difficulty while ensuring the cooling effect of the cooling structure 30.

Specifically, if only the first liquid cooling circuit 31 is provided, the first liquid cooling circuit 31 needs to be provided longer or thicker in order to secure a sufficient heat exchange area. However, the volume of the core 11 itself is small, and it is difficult to provide the first liquid cooling circuit 31 longer or thicker without interfering with the first magnetic member 12. As not only the processing difficulty of the first part 10 is increased, but also the compactness and the operation stability of the first part 10 itself are affected.

The shell peripheral wall 211 of the shell 21 is disposed around the core 11, the surface area of the shell peripheral wall 211 is much larger than that of the core 11, and when the second liquid cooling circuit 32 is disposed on the shell peripheral wall 211, the second liquid cooling circuit 32 can be relatively easily disposed longer or thicker, the defect that only the first liquid cooling circuit 31 is disposed is overcome, and the cooling structure 30 can achieve a sufficient heat exchange area relatively easily. Since the case peripheral wall 211 surrounds the first magnetic member 12 and the second magnetic member 22, the heat generated by the first magnetic member 12 and the second magnetic member 22 is radiated outwardly, the inner peripheral surface area of the case peripheral wall 211 is large, the case peripheral wall 211 receives a large amount of radiation heat, and the heat radiation path is short. This allows the second liquid cooling circuit 32 to absorb heat through the shell peripheral wall 211, and has a short heat absorption path and high heat absorption efficiency.

The second liquid cooling circuit 32 is provided by the case peripheral wall 211 to make up for the deficiency of the first liquid cooling circuit 31, and the difficulty in processing the first portion 10 is significantly reduced compared to the case where only the first liquid cooling circuit 31 is provided. The housing 21 itself has sufficient rigidity and strength to protect the internal components, and the housing peripheral wall 211 has sufficient space to accommodate the second liquid cooling circuit 32 without interference from the weaker first magnetic member 12, so that the processing difficulty is low.

After the temperature rise of the suspension motor 1 is effectively controlled by the cooling structure 30, the operation efficiency and the working stability of the suspension motor 1 can be improved.

In the present embodiment, the shape and the installation position of the first liquid cooling circuit 31 are very flexible, and the shape may be a straight tube shape, a bent tube shape, or a spiral tube shape. The first liquid cooling circuit 31 may be attached to the surface of the core 11 or may be embedded in the core 11.

In some embodiments, referring to fig. 1, the first liquid cooling loop 31 comprises: the upstream branch 311, the downstream branch 312 and the middle branch 313 are arranged at intervals, and the upstream branch 311 and the downstream branch 312 are arranged at intervals. The middle branch 313 is located at one end of the core 11 and connects the upstream branch 311 and the downstream branch 312.

The inlet and outlet ends of the first liquid cooling circuit 31 are located at the other end of the core 11, and the upstream branch 311 and the downstream branch 312 are respectively connected to the inlet and outlet ends of the first liquid cooling circuit 31.

That is, the cooling liquid enters from the inlet end of the first liquid cooling circuit 31, flows through the upstream branch 311, flows through the middle branch 313 to the downstream branch 312, and finally flows out from the outlet end of the first liquid cooling circuit 31. By the arrangement, the first liquid cooling loop 31 not only has larger contact area with the first part 10, but also ensures that the distribution range of the first liquid cooling loop 31 on the core 11 is large enough, and improves the heat absorption effect of the first liquid cooling loop 31. This also contributes to an overall uniform heat dissipation inside the levitation motor 1, maintaining an overall equilibrium of the temperature of the first part 10, avoiding internal local heat concentration.

Alternatively, as shown in fig. 3, the core 11 has a central axis L1 disposed along the first direction, and the intermediate branch 313 is disposed around the central axis L1. Therefore, the length of the middle branch 313 can be increased, the middle branch 313 has larger contact area with the core 11, the central structure of the core 11 can be avoided, and the processing difficulty is reduced.

Further alternatively, the middle branch 313 is substantially in a semicircular arc shape with a center on the central axis L1, so that the upstream branch 311 and the downstream branch 312 at two ends of the middle branch 313 have a distance far enough to facilitate positioning and processing.

In some embodiments, as shown in fig. 1 and 2, the core 11 is provided with a first channel 111 and a second channel 112 penetrating along a first direction, the upstream branch 311 is located in the first channel 111, and the downstream branch 312 is located in the second channel 112. The first duct 111 and the second duct 112 are arranged in this way, so that the processing is easy, and whether the first duct 111 and the second duct 112 are dredged or not can be checked easily after the processing, thereby reducing the rejection rate. Through the device along the first direction, the upstream branch 311 and the downstream branch 312 are inserted along the first direction during assembly, and the acting force does not need to turn during assembly, so that the assembly difficulty of the upstream branch 311 and the downstream branch 312 can be reduced. After the structure is arranged, the cooling liquid in the upstream branch 311 and the downstream branch 312 is not easy to be blocked by impurities.

Specifically, an assembly groove 113 is further formed on an end surface of one end of the core 11, two ends of the assembly groove 113 are connected with the first pore canal 111 and the second pore canal 112, and the middle branch 313 is installed at the assembly groove 113. Thus, not only the assembly groove 113 is easy to process, the middle branch 313 is easy to mount to the assembly groove 113, but also the middle branch 313 is not swayed after being limited by the assembly groove 113, so that the breakage probability of the middle branch 313 is reduced during operation.

Further, the first magnetic member 12 is in a ring shape disposed around the central axis L1, and the inner circumferential surface of the first magnetic member 12 contacts the upstream branch 311 and the downstream branch 312. In this way, the first liquid cooling circuit 31 and the first magnetic element 12 do not interfere, and the first liquid cooling circuit 31 directly contacts the heat source by the upstream branch 311 and the downstream branch 312, so that heat can be directly absorbed from the first magnetic element 12 by heat conduction, the heat absorption path is short, and the heat transfer efficiency is high.

In the present embodiment, the upstream branch 311 may be one or more than one. When there are a plurality of upstream branches 311, the same end of the plurality of upstream branches 311 is connected to the intermediate branch 313, and the plurality of upstream branches 311 merge through the intermediate branch 313.

The downstream branches 312 may be one or more than one, and when there are multiple downstream branches 312, the same end of the multiple downstream branches 312 is connected to the middle branch 313, and the middle branch 313 realizes the diversion to the multiple downstream branches 312.

In the fig. 1 and 2 arrangements, the upstream leg 311 and the downstream leg 312 are both disposed along a straight line. In other embodiments, the upstream branch 311 and the downstream branch 312 may be disposed along a curve, or may be disposed along other shapes.

In addition, the first liquid cooling circuit 31 may not include the upstream branch 311, the downstream branch 312, and the middle branch 313, and the first liquid cooling circuit 31 may take other shapes, for example, the first liquid cooling circuit 31 includes a spiral pipe section, and the spiral pipe section may alternatively be disposed in a spiral extending manner around the central axis L1.

In the present embodiment, the installation position of the second liquid cooling circuit 32 is relatively flexible. The second liquid cooling circuit 32 may be provided entirely on the case peripheral wall 211, or the second liquid cooling circuit 32 may be provided partially on the case peripheral wall 211 or partially on the case bottom wall 212. In some embodiments, a portion of the second liquid cooling circuit 32 may be disposed on the second magnetic member 22 to directly contact the heat source to absorb heat.

When the second liquid cooling circuit 32 is provided on the housing 21, it may be provided on an inner surface of the housing 21, or may be provided on an outer surface of the housing 21, or a wall hole may be formed inside the housing 21, the second liquid cooling circuit 32 may be embedded in the wall hole, or the second liquid cooling circuit 32 may be provided in a combination of at least two installation positions, or the like.

The shape of the second liquid cooling circuit 32 may be very flexible, and may be linear, mesh, or the like.

In some embodiments, referring to fig. 1 and 2, the case peripheral wall 211 is a heat conductive wall, the second liquid cooling circuit 32 is provided on the outer peripheral surface of the case peripheral wall 211, and the second magnetic member 22 is provided on the inner peripheral surface of the case peripheral wall 211. The second liquid cooling loop 32 does not occupy the inner space of the suspension motor 1, is favorable for keeping the inner structure compactness of the suspension motor 1 and ensures the driving force strength of the suspension motor 1. The second liquid cooling circuit 32 directly absorbs heat conducted by the shell peripheral wall 211 and the second magnetic member 22 by heat conduction from the shell peripheral wall 211, and the shell peripheral wall 211 can absorb internal radiation, so that the heat absorption efficiency of the second liquid cooling circuit 32 can be ensured.

Wherein the second magnetic members 22 are provided on the inner peripheral surface of the case peripheral wall 211, the inner peripheral surface of the case peripheral wall 211 provides a sufficient area to arrange the second magnetic members 22, the second magnetic members 22 may be provided thinner to reduce the overall size, or the second magnetic members 22 may be densely arranged on the inner peripheral surface of the case peripheral wall 211 to increase the magnetic field strength.

Alternatively, the second liquid cooling circuit 32 is provided to extend spirally on the case peripheral wall 211. Thus, the second liquid cooling circuit 32 can be of a single-tube structure, and can ensure a sufficiently large contact area with the shell peripheral wall 211.

Further alternatively, the second liquid cooling circuit 32 has a single spiral structure and is uniformly wound on the outer surface of the housing 21, so that the structure is simple, the reliability is high, mass production is easy to realize, a sufficient contact area with the housing 21 can be ensured, and the cooling effect is improved.

In some embodiments, the second liquid cooling circuit 32 is a circular tube, i.e. the cross section is circular, and the internal stress of the circular tube is distributed more uniformly, so that the second liquid cooling circuit can have stronger compression resistance, shearing resistance and shock resistance.

Of course, the solution of the present invention is not limited thereto, and the second liquid cooling circuit 32 may be deformed on the basis thereof, so as to achieve the purpose of increasing the contact area with the shell peripheral wall 211. If the cross section of the second liquid cooling circuit 32 is designed to be triangular as shown in fig. 4, or the cross section of the second liquid cooling circuit 32 is designed to be semicircular as shown in fig. 5, the cross section of the second liquid cooling circuit 32 may be designed to be polygonal such as trapezoid, rectangle, or other irregular shapes, and the straight side of the above shape may be in contact with the shell peripheral wall 211, so that the surface area of the shell peripheral wall 211 may be fully utilized.

Alternatively, when the cross section of the second liquid cooling circuit 32 is polygonal, corners may be chamfered, so that the overall appearance is smoother and more harmonious.

In some embodiments, as shown in fig. 1 and 2, the housing 21 further includes a bottom wall 212 connected to one end of the peripheral wall 211, and the other end of the peripheral wall 211 is a fitting end 214, and the inlet end and the outlet end of the first liquid cooling circuit 31 are located at the fitting end 214 of the housing 21. The core 11 is fixed by extending from the fitting end 214 to the outside of the housing 21 so that the core 11 is in a suspended state with respect to the housing bottom wall 212. At this time, the inlet end and the outlet end of the first liquid cooling circuit 31 are disposed at the mounting end 214 of the housing 21, so as to reduce the mounting interference at the housing peripheral wall 211. And the core 11 is fixed from the one end that assembly end 214 stretches out, and here stable in structure sets up the inlet end, the time of going out of first liquid cooling circuit 31, and first liquid cooling circuit 31 need not the suspension in casing 21, has reduced first liquid cooling circuit 31 impaired, the probability of breaking, and the reliability is higher.

The provision of the bottom wall 212 may facilitate limiting the movement of the first portion 10. And the first portion 10 can be supported by the bottom wall 212 of the housing when the coil is not energized.

Optionally, as shown in fig. 1, the housing 21 further includes a housing top wall 215 provided at the mounting end 214, and an opening is formed in the housing top wall 215, and the housing top wall 215 is integrally formed with the housing peripheral wall 211. The bottom of the housing 21 is open, the first part 10 can be fitted into the housing peripheral wall 211 from the opening, and then the top of the first part 10 protrudes from the opening of the housing top wall 215 and is fixed. The shell 21 encapsulates the bottom opening through the shell bottom wall 212, so that the first part 10 is encapsulated in the shell 21, and the upper limit and the lower limit of the first part 10 are formed. Further alternatively, the second portion 20 may further comprise a buffer block 23 provided on the bottom wall 212 of the housing, which buffer block 23 may be used for buffering when the first portion 10 moves down relative to the second portion 20.

Specifically, the center of the core 11 is provided with a center hole 114, the center hole 114 is disposed along the first direction, the center hole 114 is opened toward the bottom wall 212 of the case, the case 21 further includes a center post 213 connected to the bottom wall 212 of the case, at least a portion of the center post 213 is located in the center hole 114, and the center hole 114 is a guide hole for guiding the center post 213 to move along the first direction. The center post 213 may serve as a guide post to improve the accuracy of movement of the second portion 20 relative to the first portion 10 in the first direction, and to reduce the offset of the first portion 10 relative to the second portion 20 in a direction perpendicular to the first direction, thereby reducing wear on the first portion 10 and prolonging the service life.

In some embodiments, the second magnetic member 22 may be used as the center post 213, that is, the second magnetic member 22 is disposed at a center position in the housing 21, so that the first magnetic member 12 is disposed around the second magnetic member 22, and the driving force of the levitation motor 1 can be obtained.

In the solution of the present invention, the shape of the casing 21 is very flexible, and a cylindrical structure or a plate structure may be adopted, and the casing 21 may be projected on a plane perpendicular to the first direction, and may be circular, polygonal, or irregularly shaped. The core 11 is projected on a plane perpendicular to the first direction, and may be circular, polygonal, or take an irregular shape or the like.

In the solution of the present invention, as shown in fig. 1, the first liquid cooling circuit 31 and the second liquid cooling circuit 32 in the cooling structure 30 may be connected in series, that is, the cooling liquid flows into one circuit and then flows into the other circuit. In this way, the structural arrangement of the inlet and outlet ends of the cooling structure 30 can be simplified.

In some embodiments, the first liquid cooling circuit 31 and the second liquid cooling circuit 32 are arranged by using the same single tube, so that the cost of the cooling structure 30 is very low, and the cost of the suspension motor 1 can be greatly reduced.

In some embodiments, as shown in fig. 1, the first liquid cooling circuit 31 is connected in series upstream of the second liquid cooling circuit 32 in the direction of flow of the cooling liquid within the cooling structure 30. The cooling liquid firstly flows into the first liquid cooling loop 31 to absorb a large amount of internal heat of the suspension motor 1, and then flows into the second liquid cooling loop 32 to absorb external heat of the suspension motor 1. So when simplifying cooling structure 30, can guarantee the inside radiating effect of suspension motor 1 in priority, make the inside of easy heat collection can obtain effective cooling. The outside of the suspension motor 1 can ensure the heat dissipation effect through the combination of liquid cooling and air cooling.

In other embodiments, as shown in fig. 2, the first liquid cooling circuit 31 and the second liquid cooling circuit 32 in the cooling structure 30 may also be connected in parallel, that is, the cooling liquid may be split upstream and enter the first liquid cooling circuit 31 and the second liquid cooling circuit 32 respectively. Therefore, the internal loop and the external loop can not be crossed by heat, and the back cooling phenomenon is avoided.

Further, in some embodiments, displacement sensors are also mounted on the first and second portions 10, 20 for detecting the relative movement distance of the first and second portions 10, 20. Optionally, the displacement sensor is a wireless displacement sensor, so that wire connection is reduced, and the flexibility of the arrangement of the displacement sensor is improved.

According to the suspension motor 1 provided by the embodiment of the invention, a novel cooling structure 30 scheme is provided, the two channels are utilized to absorb heat and cool the inside and the outside of the suspension motor 1, so that the heat dissipation effect can be effectively ensured, the internal structural compactness of the suspension motor 1 is kept, and the running stability and reliability of the suspension motor 1 are improved. The circulation loop is arranged at the same time for cooling the inside and the outside, and the cooling effect is better.

An electric machine cooling system 100 according to an embodiment of the second aspect of the present invention is described below with reference to fig. 1-9.

An electric motor cooling system 100 according to an embodiment of the present invention, as shown in fig. 6, includes: a levitation motor 1, a radiator 4 and a power device 51. The radiator 4 is connected to the cooling structure 30 of the suspension motor 1 to form a circulation loop of the cooling liquid, for example, a discharge port 41 and a return port 42 are provided on the radiator 4, the discharge port 41 is connected to the cooling structure 30, and the low-temperature cooling liquid in the radiator 4 flows from the discharge port 41 to the cooling structure 30. The return port 42 is connected to the cooling structure 30, and the high-temperature cooling liquid in the cooling structure 30 flows into the radiator 4 from the return port 42. Of course, the structure of the radiator 4 may not be limited thereto, and for example, the radiator 4 is a heat dissipation pipe that is provided on the surface of the vehicle 1000 and is cooled by flowing air current, and both ends of the heat dissipation pipe are connected to the cooling structure 30. A power unit 51 is connected between the radiator 4 and the cooling structure 30 for driving the circulation of the cooling liquid in the circulation circuit. The levitation motor 1 is the levitation motor 1 described in the above embodiment, and the internal structure of the levitation motor 1 will not be described again here.

According to the motor cooling system 100 provided by the embodiment of the invention, the cooling structure 30 of the suspension motor 1 can simultaneously cool the first magnetic part 12 and the outer shell 21 inside the suspension motor 1, the radiator 4 is introduced outside the circulation loop, and the heat from the suspension motor 1 is taken away through the flow of cooling liquid, so that the outward heat dissipation capacity of the suspension motor 1 is enhanced. By arranging the power device 51, the cooling liquid cooled by the radiator 4 can reenter the next circulation, and the sustainability of a circulation loop of the cooling liquid is realized.

The circulation circuit of the coolant includes a first liquid cooling circuit 31 inside the suspension motor 1 and a second liquid cooling circuit 32 outside the suspension motor, and also includes an external radiator 4. The suspension motor 1 is a heat source, the radiator 4 is a heat release position, and the two parts together form a complete circulation loop of cooling liquid.

The type of the structure of the radiator 4 is not limited, and the radiator 4 may be an air-cooled radiator, a water-cooled radiator, or the like, depending on the application environment of the motor cooling system 100. The material of the radiator can be cast iron radiator, steel radiator or radiator made of other materials.

The power unit 51 may be a water pump structure or other devices capable of pumping coolant flow. When a water pump is used, a positive displacement pump, a vane pump, or the like may be used. The power device 51 may be installed between the discharge port 41 of the radiator 4 and the levitation motor 1, or may be installed between the return port 42 and the levitation motor 1. Or a part of the power device 51 is installed between the discharge port 41 of the radiator 4 and the levitation motor 1, and a part of the power device 51 is installed between the return port 42 and the levitation motor 1.

In some embodiments, as shown in fig. 6, the first liquid cooling loop 31 is connected in series upstream of the second liquid cooling loop 32.

Taking the example that the power device 51 is installed between the discharge port 41 of the radiator 4 and the levitation motor 1, the power device 51 is started when the circulation circuit is operated. The cooling liquid carrying heat from the inside of the levitation motor 1 and the housing 21 is sufficiently cooled and dissipated by the radiator 4. The cooled coolant flows out from the discharge port 41 of the radiator 4 and continues to flow into the levitation motor 1 via the power device 51 for the next cooling cycle. This is cycled until the internal temperature of the levitation motor 1 is reduced to the standard requirement.

For a further clarity of the circulation loop path of the cooling fluid when arranged in series, reference may be made to the schematic diagram of the circulation loop of the cooling fluid in some embodiments. As shown in fig. 7, wherein the solid line portion represents the circulation loop trend, the double arrow represents the low temperature coolant trend, and the single arrow represents the high temperature coolant trend. A is the interior of the levitation motor 1, in which a first liquid cooling circuit 31 is provided. B is the outside of the suspension motor 1, and represents that a single-spiral second liquid cooling loop 32 is arranged on the shell 21, and C represents an external radiator 4. When the circulation loop of the cooling liquid is started, the low-temperature cooling liquid flows out from the radiator 4 into the suspension motor 1 to flow through the first liquid cooling loop 31, and the low-temperature flowing cooling liquid takes away a part of heat through the suspension motor 1 and continues to flow through the second liquid cooling loop 32 on the outer shell 21 of the suspension motor 1 until the cooling liquid flows back to the radiator 4 again to perform heat dissipation and cooling. The cooling liquid after heat dissipation and cooling flows out from the radiator 4 and enters the next cooling cycle, the steps are repeated until the temperature of the cooling liquid flowing out of the suspension motor 1 is reduced to the standard requirement, and the circulation loop of the cooling liquid is closed.

In some embodiments, as shown in fig. 8, the first liquid cooling circuit 31 and the second liquid cooling circuit 32 in the cooling structure 30 may also be connected in parallel.

Specifically, as shown in fig. 8, the motor cooling system 100 further includes: the liquid separating member 61, the liquid separating member 61 has a liquid inlet 611 and two liquid separating ports 612. The radiator 4 is connected to the liquid inlet 611 of the liquid separator 61, and the liquid inlets of the first liquid cooling circuit 31 and the second liquid cooling circuit 32 are respectively connected to the two liquid inlets 612, so that the first liquid cooling circuit 31 and the second liquid cooling circuit 32 are connected in parallel. Thus, the liquid separating member 61 can be used for separating the cooling liquid outside the suspension motor 1, and a certain pipeline allowance exists between the liquid separating member 61 and the suspension motor 1, so that the interference on the relative movement of the second part 20 and the first part 10 can be reduced.

Specifically, as shown in fig. 8, the motor cooling system 100 further includes: the liquid combining parts 62 are connected to the liquid combining parts 62 at the ends of the first liquid cooling circuit 31 and the second liquid cooling circuit 32, and the liquid combining parts 62 are connected to the radiator 4, and the liquid combining parts 62 are combined to facilitate connection with the radiator 4.

In some embodiments, as shown in fig. 8, the motor cooling system 100 further includes: and a switching element 52 for controlling the flow state of the second liquid cooling circuit 32. The switching element 52 is connected in series with the second liquid cooling circuit 32.

That is, when the power device 51 is started, the first liquid cooling circuit 31 is kept on, and the switching element 52 controls the on/off of the second liquid cooling circuit 32 independently. Thus, the first liquid cooling circuit 31 may be selected to operate alone or the first liquid cooling circuit 31 and the second liquid cooling circuit 32 may be selected to operate simultaneously, as required. Thereby, it is possible to ensure the cooling effect of the inside of the levitation motor 1 that is easily heat-collected, and then selectively switch on and off the second liquid cooling circuit 32 according to the degree of emergency. This saves power consumption of the power unit 51 when the temperature of the levitation motor 1 does not reach an emergency. The radiator 4 is concentrated to radiate heat for the first liquid cooling circuit 31 inside the levitation motor 1, so that the levitation motor 1 is kept in a safe state.

When the temperature of the levitation motor 1 reaches the emergency state, the first liquid cooling circuit 31 and the second liquid cooling circuit 32 are operated simultaneously, and the power consumption of the power device 51 is increased, but the inside and the outside of the levitation motor 1 can be rapidly cooled, which is helpful for the rapid falling of the temperature of the levitation motor 1.

Alternatively, the switching member 52 is a solenoid valve, or the switching member 52 may be replaced by an electric valve, a pneumatic valve, or the like, without limitation.

Alternatively, the liquid separating member 61 and the liquid combining member 62 may employ special pipe joints to improve the connection tightness.

In some embodiments, as shown in fig. 6 and 8, the motor cooling system 100 further includes: a temperature detecting member 71 and a controller 73. The temperature detecting member 71 is provided on the levitation motor 1 for detecting whether the temperature of the levitation motor 1 is excessively high or whether cooling is required. The controller 73 is electrically connected to the temperature detecting member 71 and the power device 51, and the controller 73 is configured to control the operation of the power device 51 according to the detection result of the temperature detecting member 71. Thus, the intelligent control of the motor cooling system 100 can be realized, the operation of the power device 51 can be accurately controlled according to the temperature, and the operation is stopped when the temperature of the suspension motor 1 is not high, so that the energy saving is realized.

Specifically, when the first liquid cooling circuit 31 and the second liquid cooling circuit 32 are connected in parallel and the switching element 52 is used to individually control the on/off of the second liquid cooling circuit 32, the controller 73 is further electrically connected to the switching element 52, and the controller 73 is configured to control the operation of the switching element 52 according to the detection result of the temperature detecting element 71. In this way, it is possible to selectively determine whether the first liquid cooling circuit 31 and the second liquid cooling circuit 32 need to be simultaneously opened according to the temperature, thereby further realizing energy saving while guaranteeing the internal cooling effect of the levitation motor 1.

As can be seen in the control relationship shown in fig. 9, after the detection result of the temperature detecting member 71 is communicated to the processor 72, the processor 72 will obtain the processing result. The processor 72 communicates the result of the processing to the controller 73 and the control strategy is determined by the controller 73.

The controller 73 may control the power device 51 and the switch 52, and when the power device 51 is turned on, the cooling liquid in the first liquid cooling circuit 31 circulates. When the power device 51 is turned on and the switching element 52 is turned on, the coolant in the second liquid cooling circuit 32 circulates.

The number and position of the temperature detecting elements 71 are very flexible here. In the control based on the detection result of the temperature detecting member 71, the judgment and control may be performed based on the average value of a plurality of detection values for one preset period of time detected by the temperature detecting member, or based on the instantaneous value thereof. The temperature detecting member 71 may be one or more, and when more than one is used, the highest value thereof may be selected as a criterion, or an average value of the detection results of the plurality of temperature detecting members 71 may be selected as a criterion, which is not limited herein.

In some alternative embodiments, as shown in fig. 1, the temperature detecting member 71 is located at the outlet end of the first liquid cooling circuit 31, where the highest temperature in the first liquid cooling circuit 31 can be detected. At this time, the detection result of the temperature detecting element 71 can reflect the temperature condition inside the levitation motor 1 and the heat absorption condition of the first liquid cooling circuit 31 to some extent.

Alternatively, the detecting end of the temperature detecting member 71 extends into the pipeline of the first liquid cooling circuit 31 to directly detect the temperature of the cooling liquid, so that the detecting result is more accurate.

In alternative embodiments, as shown in fig. 2, the temperature sensing element 71 is embedded in the core 11, preferably in the core 11 at a location where heat is most easily collected, so that the highest temperature in the first portion 10 can be accurately sensed. According to this result, the operation of the power unit 51 is controlled so that the temperature at the highest temperature in the first portion 10 gradually decreases, which contributes to the improvement of the operational safety and reliability of the levitation motor 1.

At this time, the temperature detecting member 71 is not limited by the cooling structure 30, and the position selection is flexible. For example, the temperature detecting member 71 may be disposed at an end of the core 11 adjacent to the bottom wall 212 of the case and on an inner wall of the central hole 114, where heat dissipation is not easy, and a heat collecting point is easily formed.

In some embodiments, as shown in FIG. 8, the motor cooling system 100 further includes a reservoir 63 coupled to the circulation loop to facilitate buffering of the cooling fluid by the storage capacity of the reservoir 63 as the cooling fluid expands or contracts in the circulation loop. The liquid storage pot 63 can be replenished when the cooling liquid in the circulation loop is insufficient, and the redundant cooling liquid can flow into the liquid storage pot 63 for storage when the cooling liquid in the circulation loop is excessive. Thereby, the environmental adaptability of the motor cooling system 100 is improved.

According to the motor cooling system 100 of the embodiment of the invention, the radiator 4 and the power device 51 are utilized to realize the circulation flow of the cooling liquid between the suspension motor 1 and the radiator 4, so as to achieve the active heat dissipation and improve the cooling and heat dissipation effects on the suspension motor 1.

A cooling control method of the motor cooling system 100 according to the embodiment of the third aspect of the present invention, in which the motor cooling system 100 has been described in the above-described embodiment, will be described below with reference to fig. 1 to 12.

Referring to fig. 10, the cooling control method includes the steps of:

p1: detecting the real-time temperature of a set position on the suspension motor 1;

p2: when the real-time temperature is smaller than the first set temperature t1, the power device 51 is controlled to stop running;

p3: when the real-time temperature is greater than or equal to the first set temperature t1, the power unit 51 is controlled to operate.

According to the cooling control method of the motor cooling system 100 provided by the embodiment of the invention, the operation scheme of the motor cooling system 100 can be determined according to the real-time temperature of the suspension motor 1, so that the internal temperature of the suspension motor 1 is ensured to reach a safe range. The control mode of determining the cooling operation by utilizing the real-time temperature has higher temperature control accuracy on the suspension motor 1, and can indicate that the internal temperature of the suspension motor 1 is safer when the real-time temperature does not reach the first set temperature t1, and the power device 51 is controlled to stop operation at the moment, so that the operation energy consumption of the power device 51 can be saved.

The real-time temperature can be measured by the temperature detecting member 71, so that the obtained real-time temperature of the set position of the levitation motor 1 is accurate. The solution of the present invention may also be not limited to this, for example, an infrared imager is further disposed in the use environment of the motor cooling system 100, where the infrared imager is used for detecting the ambient temperature of the levitation motor 1, and the temperature of the levitation motor 1 at the set position may be obtained by the way, and at this time, the temperature value measured by the infrared imager at the set position of the levitation motor 1 may be used as the real-time temperature. At this time, it is not necessary to specially install the temperature detecting member 71, thereby reducing the cost.

In some embodiments, the switching operation of the power unit 51 may be controlled in real time based on the real time temperature of the set position on the levitation motor 1. That is, in step P1, it is necessary to control and detect the real-time temperature of the set position on the levitation motor 1 in real time. Once the real-time temperature obtained in real time is less than the first set temperature t1, the power plant 51 is turned off. Once the real-time temperature obtained in real time is equal to or higher than the first set temperature t1, the power device 51 is turned on. This is advantageous in that the temperature at the set position on the levitation motor 1 is maintained in a state of not exceeding the first set temperature t 1.

In other embodiments, the power plant 51 may be controlled in time periods after being turned on. I.e. the power plant 51, after having obtained a control strategy, maintains the state of the power plant 51 unchanged during a set period. When the set period ends, the power plant 51 changes the operating state or maintains the operating state according to another control strategy retrieved. With this arrangement, the state of the power device 51 does not need to be changed frequently, so that not only is energy-saving, but also the strain of the power device 51 caused by the over-frequency state change is reduced.

In some embodiments, in step P3 above: when the real-time temperature is greater than or equal to the first set temperature t1, the power device 51 is controlled to run for a set period in the running process of the power device 51. The cooling control method further includes: based on the real-time temperature during the set period, it is determined whether the power plant 51 enters the next set period after the set period is completed.

Here, the real-time measurement state can be maintained for temperature detection at a set position on the levitation motor 1 during a set period of the power device 51. In this case, the measured temperature at a certain point in the set period may be used as the real-time temperature, the average value of all measured temperatures measured in the set period may be used as the real-time temperature, and the highest temperature or the lowest temperature measured in the set period may be used as the real-time temperature.

For example, when the set period is 2 minutes, the power unit 51 remains on for 2 minutes after being turned on. The temperature detecting means 71 detects the temperature in real time and uses the real time temperature at the time point (for example, at the time of 1 st minute and 50 seconds in 2 minutes) near the end of the setting cycle as the data for judging whether the power unit 51 is replaced or not after the end of the setting cycle.

In the setting period of the power device 51, the temperature detection of the setting position on the suspension motor 1 can be performed only at a certain or certain time points, so that the number of detected temperature values can be reduced, and the data processing capacity of the system can be reduced.

When the real-time temperature in the set period is obtained and judged, the comparison parameter may be still the first set temperature t1, or another temperature parameter different from the first set temperature t1 may be selected.

In some embodiments, as shown in fig. 8, when the first liquid cooling circuit 31 and the second liquid cooling circuit 32 are connected in parallel, and the motor cooling system 100 further includes the switching element 52 for controlling the flow state of the second liquid cooling circuit 32, the switching control of the switching element 52 may also use the same control logic as that of the power device 51. Of course, when the switch 52 is opened, the power device 51 needs to be ensured to operate, so that the cooling liquid can flow in the second liquid cooling circuit 32 to dissipate heat, and therefore, the switch 52 is opened on the premise that the power device 51 keeps operating.

For example, in some embodiments, when the real-time temperature is greater than or equal to the first set temperature t1, it may be desirable to compare the real-time temperature to the second set temperature t2 during the step of controlling the operation of the power plant 51.

When the real-time temperature is less than the second set temperature t2, the control switch 52 is turned off;

when the real-time temperature is equal to or higher than the second set temperature t2, the switching piece 52 is controlled to be opened.

In this way, whether the temperature of the suspension motor 1 is reduced urgently can be judged according to the comparison result of the real-time temperature and the second set temperature t 2. When the real-time temperature is smaller than the second set temperature t2, it is determined that the cooling requirement of the suspension motor 1 is not urgent, at this time, the control switch piece 52 is turned off, the cooling liquid in the first liquid cooling loop 31 flows, the second liquid cooling loop 32 does not flow, the circulating consumption of the cooling liquid is saved, and the energy consumption is reduced.

When the real-time temperature is greater than or equal to the second set temperature t2, it is determined that the cooling requirement of the suspension motor 1 is urgent, at this time, the control switch piece 52 is turned on, and the cooling liquid in the first liquid cooling loop 31 and the second liquid cooling loop 32 flows, so that the heat dissipation speed is improved.

A vehicle 1000 according to a fourth aspect of the invention is described below with reference to fig. 1-13.

As shown in fig. 11, a vehicle 1000 includes: a vehicle body 810, and a frame 820 provided at the bottom of the vehicle body 810. The vehicle 1000 also includes wheels 830, the wheels 830 being mounted on the frame 820.

In the vehicle 1000 according to the aspect of the present invention, the levitation motor 1 according to the embodiment of the first aspect may be included, and the motor cooling system 100 according to the embodiment of the second aspect may be included, and the levitation motor 1 may be included in the motor cooling system 100. The structure of the levitation motor 1 and the motor cooling system 100 will not be described here.

One of the core 11 and the housing 21 of the levitation motor 1 is connected with the vehicle body 810, and the other of the core 11 and the housing 21 is connected with the vehicle frame 820. Specifically, the levitation motor 1 may be disposed in the forward direction, and the levitation motor 1 may be disposed in the reverse direction. In the forward direction, the stator part of the levitation motor 1 is connected with the frame 820, and the stator part of the levitation motor 1 is connected with the vehicle body 810. When the suspension motor is reversely arranged, the stator part of the suspension motor 1 is connected with the vehicle body 810, and the stator part of the suspension motor 1 is connected with the vehicle frame 820. By this arrangement, the levitation motor 1 constitutes an active suspension of the vehicle 1000, which has a high driving effect and is very easy to install.

Through set up the cooling structure 30 including first liquid cooling return circuit 31 and second liquid cooling return circuit 32 on suspension motor 1, at least part of first liquid cooling return circuit 31 is established on core 11, and at least part of second liquid cooling return circuit 32 is established on shell perisporium 211, makes suspension motor 1 can inside and outside two-way liquid cooling heat dissipation, guarantees suspension motor 1's cooling effect, ensures suspension motor 1's operating efficiency and insulating properties, can maintain suspension motor 1's steady operation. The suspension motor 1 is mounted on the vehicle 1000 as an active suspension, ensuring the comfort of the operation of the vehicle 1000.

The control flow adopted by the different types of levitation motors 1 on the vehicle 1000 will be described below with reference to some specific examples.

Referring to fig. 6 and 12, in some specific examples, a levitation motor 1 for use with a vehicle 1000 has a first liquid cooling circuit 31 connected in series upstream of a second liquid cooling circuit 32. The cooling control flow of the vehicle 1000 with respect to the levitation motor 1 is as shown in fig. 12:

q11: beginning and then proceeding to Q12;

q12: system self-checking and whole vehicle running state monitoring, and then entering Q13;

q13: judging whether the self-checking and monitoring results are normal, if so, entering Q16, and if not, entering Q14;

q14: sending out signal early warning, and then entering Q15;

q15: maintenance is carried out by eliminating the faults, and the process returns to Q12;

q16: acquiring the real-time temperature of the set position of the suspension motor 1, and then entering Q17;

q17: judging whether the real-time temperature is smaller than the first set temperature t1, if so, entering Q19, and if not, entering Q18;

q18: turning on or holding on the power unit 51, and holding on and running the power unit 51 for a set period, and then returning to Q16;

q19: the power plant 51 is turned off or remains off and then returns to Q16, and so on.

After reaching the step Q19, the process can jump to the step Q20 at any time;

Q20: cooling of the suspension motor 1 is completed, and the suspension motor enters Q21;

q21: and (5) ending.

In some specific examples, the cooling liquid is water, and when the temperature detecting member 71 detects that the water temperature at the set position is equal to or higher than the first set temperature t1, the processor 72 starts the circulation circuit of the cooling liquid to cool the suspension motor 1 through the controller 73. One set period is two minutes, and the processor 72 performs processing calculation based on the real-time temperature detected by the temperature detecting member 71 immediately after two minutes are reached. If the real-time temperature is lower than the first set temperature t1, the circulation circuit of the coolant is closed when two minutes are reached, and the circulation circuit of the coolant is restarted when the temperature detecting member 71 detects that the real-time temperature is equal to or higher than the first set temperature t 1.

If the temperature detecting member 71 detects that the real-time temperature is equal to or higher than the first set temperature t1 when the one set period is about to reach two minutes, the circulation circuit of the coolant is kept on after two minutes until the next set period is about to complete and the real-time temperature is lower than the first set temperature t 1. The temperature detection part 71 can monitor in real time in the process, and the processor 72 can also receive the signals of the real-time temperature detection part 71 in real time and process and calculate the signals, so that the timeliness and the high efficiency of heat dissipation of the suspension motor 1 are ensured. The cooling control mode with time division can avoid a great deal of energy waste, and is more energy-saving and environment-friendly.

Referring to fig. 8 and 13, in another specific example, a levitation motor 1 for a vehicle 1000 has a first liquid cooling circuit 31 and a second liquid cooling circuit 32 connected in parallel, and a switch 52 is further provided to control the second liquid cooling circuit 32. The cooling control flow of the vehicle 1000 with respect to the levitation motor 1 is as shown in fig. 13:

r11: beginning and then entering R12;

r12: system self-checking and whole vehicle running state monitoring, and then entering R13;

r13: judging whether the self-checking and monitoring results are normal, if so, entering R16, and if not, entering R14;

r14: sending out signal early warning, and then entering R15;

r15: maintenance is carried out, and R12 is returned;

r16: acquiring the real-time temperature of the set position of the suspension motor 1, and then entering R17;

r17: judging whether the real-time temperature is smaller than a first set temperature t1, if so, entering R19, and if not, entering R18;

r18: judging whether the real-time temperature is smaller than a second set temperature t2, if so, entering R22, and if not, entering R23;

r19: turning off or maintaining the power device 51 off, turning off or maintaining the switch 52 off, and then returning to R16, thus cycling back and forth;

after reaching the step R19, the process can jump to R20 at any time;

R20: cooling the suspension motor 1 is completed, and R21 is entered;

r21: ending;

r22: turning on or maintaining the power device 51 on, turning off or maintaining the switching element 52 off, and returning to R16, and repeating the cycle;

r23: the power device 51 is turned on or kept on, the switching element 52 is turned on or kept on, and then R16 is returned, and the cycle is repeated.

The structure can timely switch on and off the second liquid cooling loop 32 according to the real-time temperature of the set position of the suspension motor 1, so that the whole cooling circulation loop is more efficient and energy-saving.

In one specific example, the cooling control flow in a vehicle 1000 is as follows:

firstly, the system performs self-checking and whole vehicle running and control strategy detection after the vehicle 1000 is started, if a problem occurs, an image or sound early warning signal is sent out at a designated position, and a driver performs self-help troubleshooting according to a specification or performs maintenance processing by a professional technician when a special abnormality occurs. If the system self-check and the whole vehicle operation and control strategy detection are normal, the temperature detection part 71 in the suspension motor 1 works, and the temperature detection starts. The suspension will not start to operate until the vehicle 1000 is started, and the internal temperature will not be very high, which would result in energy waste if the hydraulic cooling cycle is started. Therefore, we set the first set temperature t1 to avoid unnecessary waste of energy of the vehicle 1000.

When the real-time temperature of the set position inside the levitation motor 1 is less than t1, the temperature inside the levitation motor 1 is within the required range, the circulation loop of the cooling liquid is not operated, the corresponding power device 51 and the switching part 52 are kept closed, and the temperature detecting part 71 is normally operated. It should be noted that, the temperature detecting element 71 monitors in real time during the movement process of the suspension motor 1, and the processor 72 receives the signal of the temperature detecting element 71 to perform real-time calculation processing, so as to ensure timely and efficient operation of the cooling system.

When the temperature detecting member 71 detects that the real-time temperature is greater than or equal to t1 and less than t2, the processor 72 starts the power device 51 through the controller 73, the first liquid cooling loop 31 works and cools the interior of the suspension motor 1 until the temperature detecting member 71 detects that the real-time temperature is less than t1, and cooling is completed. At this time, the processor 72 turns off the power device 51 by the controller 73, and the first liquid cooling circuit 31 is turned off.

When the real-time temperature detected by the temperature detecting piece 71 is greater than or equal to t2, the corresponding switch piece 52 is turned on, the power device 51 is in a working state, and the first liquid cooling loop 31 and the second liquid cooling loop 32 are simultaneously turned on to rapidly cool the suspension motor 1 until the real-time temperature detected by the temperature detecting piece 71 is less than t2. At this time, the controller 73 turns off the switching element 52, and the second liquid cooling circuit 32 is turned off. The power device 51 is kept on, and the levitation motor 1 is cooled only by the first liquid cooling circuit 31 until the temperature detected by the temperature detecting member 71 is less than t1. At this time, the processor 72 turns off the power unit 51 by the controller 73, and the cooling is completed.

The control strategy takes the internal temperature of the suspension motor 1 as a trigger condition, the detection result of the temperature detection piece 71 in the suspension motor 1 can be used as a parameter, the power device 51 and the switch piece 52 are correspondingly controlled to be on-off, the cooling of the suspension motor 1 is rapidly realized, and the energy is saved and the efficiency is improved.

By the way, since the temperature detecting member 71 is built in, the real-time temperature is the actual temperature inside the levitation motor 1, and the measuring effect is more obvious and the measured temperature value is larger than that of the direct water temperature measuring method. Thus, t1 can be controlled between 20 ℃ and 50 ℃ and t2 can be controlled between 80 ℃ and 120 ℃.

Other components of the vehicle 1000 according to the embodiment of the present invention, such as a driving system and a power system, etc., the structure and operation principle thereof are known to those skilled in the art, and will not be described in detail herein.

In the description herein, reference to the term "embodiment," "example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A levitation motor comprising:

a first portion including a core and a first magnetic member provided on the core, the core being disposed along a first direction;

a second portion including a housing and a second magnetic member provided on the housing, the housing including a housing peripheral wall surrounding an outside of the core, the second portion being movable in the first direction with respect to the first portion;

the cooling structure comprises a first liquid cooling loop and a second liquid cooling loop, at least part of the first liquid cooling loop is arranged on the first part, and at least part of the second liquid cooling loop is arranged on the shell peripheral wall.

2. The levitation motor of claim 1, wherein the first liquid cooling circuit and the second liquid cooling circuit are connected in series or in parallel.

3. The levitation motor of claim 2, wherein the first liquid cooling circuit is connected in series upstream of the second liquid cooling circuit in a flow direction of the cooling liquid within the cooling structure.

4. The levitation motor of claim 1, wherein the first liquid cooling circuit comprises: the device comprises an upstream branch, a downstream branch and a middle branch, wherein the upstream branch and the downstream branch are arranged at intervals;

the middle branch is positioned at one end of the core body and is connected with the upstream branch and the downstream branch;

the inlet end and the outlet end of the first liquid cooling loop are positioned at the other end of the core body, and the upstream branch and the downstream branch are respectively connected with the inlet end and the outlet end of the first liquid cooling loop.

5. The levitation motor of claim 4, wherein the core has a central axis disposed along the first direction, the middle leg being disposed about the central axis.

6. The levitation motor of claim 4, wherein the first magnetic member is a coil and the second magnetic member is a permanent magnet, and wherein the inner circumferential surface of the first magnetic member is in contact with the upstream and downstream legs.

7. The levitation motor of claim 4, wherein the core body is provided with a first duct and a second duct penetrating along the first direction, and an assembly groove is further formed on an end surface of one end of the core body, and two ends of the assembly groove are connected with the first duct and the second duct;

the upstream branch is located in the first pore canal, the downstream branch is located in the second pore canal, and the middle branch is installed at the assembling groove.

8. The levitation motor of any of claims 1-7, wherein the shell perimeter wall is a thermally conductive wall;

the second liquid cooling loop is arranged on the outer peripheral surface of the shell peripheral wall, and the second magnetic piece is arranged on the inner peripheral surface of the shell peripheral wall.

9. The levitation motor of any of claims 1-7, wherein the second liquid cooling circuit is disposed in a spiral extending on the housing peripheral wall.

10. The levitation motor of any of claims 1-7, wherein the housing further comprises a bottom wall connected to one end of the peripheral wall, the other end of the peripheral wall being an assembly end, the inlet and outlet ends of the first liquid cooling circuit being located at the assembly end of the housing, the core extending from the assembly end to outside the housing.

11. The levitation motor of claim 10, wherein the core has a central aperture disposed in the first direction, the central aperture opening toward the housing bottom wall, the housing further comprising a central post coupled to the housing bottom wall, at least a portion of the central post positioned within the central aperture, the central aperture being a guide aperture for guiding movement of the central post in the first direction.

12. A motor cooling system, comprising:

a levitation motor according to any of claims 1-11;

the radiator is connected with the cooling structure of the suspension motor to form a circulation loop of cooling liquid;

and the power device is connected between the radiator and the cooling structure and is used for driving the cooling liquid to circularly flow in the circulation loop.

13. The motor cooling system of claim 12, wherein the first liquid cooling loop and the second liquid cooling loop are connected in series, an inlet end of one of the first liquid cooling loop and the second liquid cooling loop is connected to the radiator, and an outlet end of the other of the first liquid cooling loop and the second liquid cooling loop is connected to the radiator;

Or the motor cooling system further comprises: the liquid separation piece is provided with a liquid inlet and two liquid separation openings, the radiator is connected with the liquid inlet of the liquid separation piece, and the liquid inlets of the first liquid cooling loop and the second liquid cooling loop are respectively connected with two liquid separation openings so that the first liquid cooling loop and the second liquid cooling loop are connected in parallel.

14. The motor cooling system of claim 13, wherein the first liquid cooling circuit and the second liquid cooling circuit are connected in parallel through the liquid dividing member, the motor cooling system further comprising: and the switching piece is used for controlling the flow state of the second liquid cooling loop and is connected in series with the second liquid cooling loop.

15. The electric machine cooling system according to any one of claims 12-14, further comprising:

the temperature detection piece is arranged on the suspension motor;

and the controller (73) is electrically connected with the temperature detection piece and the power device so as to control the operation of the power device according to the detection result of the temperature detection piece.

16. The motor cooling system of claim 15, wherein the temperature sensing element is located at an outlet end of the first liquid cooling circuit or is embedded in the core.

17. A cooling control method applied to the motor cooling system according to any one of claims 12 to 16, characterized by comprising the steps of:

detecting the real-time temperature of a set position on the suspension motor;

18. The cooling control method of the motor cooling system according to claim 17, wherein the power plant is controlled to operate for a set period in operation when the real-time temperature is greater than or equal to the first set temperature;

the cooling control method further includes: and determining whether the power device enters the next set period after the set period is finished according to the real-time temperature in the set period.

19. The cooling control method of the motor cooling system according to claim 17 or 18, wherein when the first liquid cooling circuit and the second liquid cooling circuit are connected in parallel, and the motor cooling system further includes a switching element for controlling a flow state of the second liquid cooling circuit, the controlling the power device to operate further includes, when the real-time temperature is greater than or equal to the first set temperature:

When the real-time temperature is smaller than a second set temperature, the switch piece is controlled to be closed;

and when the real-time temperature is greater than or equal to the second set temperature, controlling the switch piece to be opened.

20. A vehicle, characterized by comprising:

a vehicle body;

a frame arranged at the bottom of the vehicle body;

the levitation motor of any of claims 1-11 or comprising the motor cooling system of any of claims 12-16, one of the core and the housing of the levitation motor coupled to the vehicle body and the other of the core and the housing coupled to the vehicle frame.