Linear motor, electromagnetic damping device and vehicle

Abstract

The invention provides a linear motor, an electromagnetic damping device and a vehicle. The linear motor comprises a rotor and a stator. The rotor is arranged on the outer side of the stator in a sleeving mode, and the rotor and the stator can move relatively in the axial direction. When the mover moves upwards from the initial position to the second limit position, the stroke is recorded as an upper stroke, and when the mover moves downwards from the initial position to the first limit position, the stroke is recorded as a lower stroke; in the down stroke, the effective combination length between the stator and the rotor is recorded as a first effective combination length, and in the up stroke, the effective combination length between the stator and the rotor is recorded as a second effective combination length; wherein the first effective combination length is smaller than the second effective combination length. Different effective combination lengths between the stator and the rotor in different strokes are set, so that different thrust expressions are realized in the up stroke and the down stroke of the linear motor, and different working condition requirements are met.

Description

Technical Field

[0001] The invention relates to the technical field of motors, in particular to a linear motor with a variable effective coupling length, an electromagnetic vibration reduction device based on the linear motor and a vehicle comprising the device. Background Art

[0002] The electromagnetic vibration reduction device usually includes a fixed seat and a linear motor. The fixed seat is used to connect the vehicle body, and the linear motor is used as an actuator. The linear motor includes a stator and a mover. The part fixedly connected to the fixed seat is called the stator, and the part moving relative to the stator is called the mover. When a traditional linear motor is running, the effective coupling length between the mover and the stator usually remains unchanged, which limits the performance optimization of the motor under different working conditions. In addition, in the vehicle vibration reduction system, traditional mechanical vibration reduction methods often have problems such as slow response and limited adjustment range. Specifically, in the working condition of the upstroke of the linear motor, it is necessary to carry the load to stably provide thrust upward; in the working condition of the downstroke of the linear motor, the linear motor is mainly driven downward by the gravity of the load, and the linear motor mainly provides a buffer force in the opposite direction. Excessive thrust will hinder the movement of the downstroke. Therefore, it is of great significance to develop a linear motor and its electromagnetic vibration reduction device that can automatically adjust the effective thrust according to the working conditions to improve efficiency and adaptability. Summary of the invention

[0003] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description of the Invention section. The Summary of the Invention section of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0004] In order to at least partially solve the above problems, the present application provides a linear motor in a first aspect, the linear motor comprising:

[0005] mover and stator;

[0006] The mover is sleeved on the outside of the stator and the mover and the stator can move relative to each other in the axial direction;

[0007] The moving element moves downward from the initial position to the first limit position as a down stroke, and the moving element moves upward from the initial position to the second limit position as an up stroke;

[0008] In the downstroke, the effective combination length between the stator and the mover is recorded as a first effective combination length, and in the upstroke, the effective combination length between the stator and the mover is recorded as a second effective combination length;

[0009] Wherein, the first effective binding length is smaller than the second effective binding length.

[0010] According to the linear motor of the first aspect of the present application, by setting different effective connection lengths between the stator and the mover in different strokes, it is ensured that the linear motor achieves different thrust performances in the downstroke and upstroke to meet different working conditions. Specifically, the second effective connection length of the upstroke is greater than the first effective connection length, ensuring that the thrust of the linear motor in the upstroke is greater than the thrust of the downstroke.

[0011] Optionally, the first effective combination length remains unchanged; and in the downstroke, the second effective combination length gradually decreases.

[0012] Optionally, the stator includes a winding and a stator core, the winding is arranged on the stator core; the mover includes a magnet; the first effective combination length is: the relative axial length of the stator core and the magnet in any state in the upstroke; the second effective combination length is: the relative axial length of the stator core and the magnet in any state in the downstroke.

[0013] Optionally, the axial dimension of the magnetic steel is smaller than the axial dimension of the stator core; and / or in the initial position, the lower end surface of the stator core is aligned with the end surface of the magnetic steel in the axial direction.

[0014] Optionally, the dimension of the mover in the axial direction is larger than the dimension of the stator core assembly in the axial direction.

[0015] A second aspect of the present application provides an electromagnetic vibration reduction device, the electromagnetic vibration reduction device comprising:

[0016] A fixing base, the fixing base is used to connect to the body of the vehicle; and

[0017] The aforementioned linear motor, wherein the stator of the linear motor is fixedly arranged relative to the fixing seat;

[0018] A first limiting member, the first limiting member is located outside the mover and is fixed relative to the fixing seat; and

[0019] A second limiting member, the second limiting member is located outside the housing of the mover and is fixed relative to the housing; the second limiting member is axially located between the fixing seat and the first limiting member;

[0020] The first limit member and the second limit member move relative to each other in the axial direction along with the mover and the stator. When the first limit member contacts the second limit member, the linear motor is at the second limit position of the upper stroke.

[0021] Optionally, the electromagnetic vibration reduction device further includes:

[0022] a third stopper, the third stopper being located at an inner side of the mover and being fixed relative to the stator; and

[0023] a fourth limiting member, wherein the fourth limiting member is fixedly arranged relative to the housing;

[0024] The third limit member and the fourth limit member move relative to each other in the axial direction as the mover and the stator move. When the third limit member contacts the fourth limit member, the linear motor is at the first limit position of the lower stroke.

[0025] Optionally, the electromagnetic vibration reduction device further includes:

[0026] A first buffer member is connected to at least one of the first limiting member and the second limiting member.

[0027] Optionally, the electromagnetic vibration reduction device further includes:

[0028] A second buffer member connected to at least one of the third limiting member and the fourth limiting member.

[0029] Optionally, the electromagnetic vibration reduction device further includes:

[0030] A spring is sleeved on the outside of the linear motor, and the spring is limitedly fitted between the fixing seat and the second limiting member along the first direction.

[0031] Optionally, the electromagnetic vibration reduction device further includes:

[0032] The protective cover is constructed as a structure capable of deforming along the axial direction, the protective cover is sleeved on the outside of the shell, one end of the protective cover along the axial direction is fixed relative to the fixing seat, and the other end of the protective cover along the axial direction is fixed relative to the shell to shield the stator.

[0033] A third aspect of the present application provides a vehicle, the vehicle comprising:

[0034] the body of the vehicle; and

[0035] As in the above-mentioned electromagnetic vibration reduction device, the fixing seat is connected to the vehicle body.

[0036] According to the vehicle of the third aspect of the present application, by applying the above-mentioned electromagnetic vibration reduction device, it is beneficial to change the electromagnetic vibration reduction device to push up and down to provide different thrust countermeasures, so as to improve the overall stability of the vehicle body. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The following drawings of the embodiments of the present application are hereby used as part of the present application for understanding the present application. The drawings show the embodiments of the present application and their descriptions, and are used to explain the principles of the present application. In the drawings,

[0038] Figure 1It is a front view of an electromagnetic vibration reduction device according to a preferred embodiment of the present application;

[0039] Figure 2 for Figure 1 A top view of the electromagnetic vibration reduction device shown;

[0040] Figure 3 For along Figure 2 A cross-sectional view taken along line AA in FIG.

[0041] Figure 4 A schematic diagram of the connection between the heat conducting element and the heat dissipating element; and

[0042] Figure 5 for Figure 4 Top view of the .

[0043] Description of reference numerals:

[0044] 100: Fixed seat 110: Linear motor

[0045] 111: mover 112: housing

[0046] 113: Magnetic steel 114: Stator

[0047] 115: Winding 116: Mandrel

[0048] 116a: third stopper 117: bearing assembly

[0049] 120: Connecting member 121: First limiting member

[0050] 122: Accommodating cavity 120a: Weight reduction hole

[0051] 130: second limiter 140: fourth limiter

[0052] 150: first buffer member 160: second buffer member

[0053] 170: Displacement sensor 171: First sensor unit

[0054] 172: Second sensor 180: Spring

[0055] 190: Protective cover 210: Heat conducting part

[0056] 220: heat sink 230: support plate

[0057] 240: Reinforcement plate 250: Rubber part

[0058] D1: First direction DETAILED DESCRIPTION

[0059] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application embodiments can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application embodiments, some technical features well known in the art are not described.

[0060] In order to fully understand the implementation of the present application, a detailed structure will be presented in the following description. Obviously, the implementation of the implementation of the present application is not limited to the specific details familiar to those skilled in the art.

[0061] It should be understood that the purpose of the terms used herein is only to describe specific embodiments and is not intended to limit the present application, and the singular forms "a", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. When the terms "comprise" and / or "include" are used in this specification, they indicate the presence of the features, integral bodies, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integral bodies, steps, operations, elements, components and / or combinations thereof.

[0062] Ordinal numbers such as "first" and "second" cited in this application are merely identifiers and do not have any other meaning, such as a specific order. Moreover, for example, the term "first component" itself does not imply the existence of a "second component", and the term "second component" itself does not imply the existence of a "first component". It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inner", "outer" and similar expressions used in this application are for illustrative purposes only and are not limiting.

[0063] Hereinafter, specific embodiments of the present application will be described in more detail with reference to the accompanying drawings. These drawings show representative embodiments of the present application and do not limit the present application.

[0064] The present application provides a linear motor 110. Figures 1 to 5As shown, the linear motor 110 of the present application can be arranged in an electromagnetic vibration reduction device, which also includes a fixed seat 100, a first stopper 121 and a second stopper 130. According to the linear motor 110 of the present application, it includes a mover 111 and a stator 114. The mover 111 includes a housing 112. The stator 114 is arranged in the housing 112 and fixedly arranged relative to the fixed seat 100. The fixed arrangement here and below can be a non-detachable fixed connection or a detachable connection. The housing 112 can be configured to be able to move at least to an initial position and a first limit position relative to the stator 114 along a first direction D1. The first direction D1 here can be understood as being substantially consistent with the height direction of the vehicle when the electromagnetic vibration reduction device is installed on the vehicle. The first stopper 121 is located on the outside of the housing 112 and is fixedly arranged relative to the fixed seat 100. The second stopper 130 is located on the outside of the housing 112 and is fixedly arranged relative to the housing 112. The second limit member 130 is located between the fixing seat and the first limit member 121 along the first direction D1. The orthographic projection of the second limit member 130 in a first plane perpendicular to the first direction D1 at least partially overlaps with the orthographic projection of the first limit member 121 in the first plane. The first plane here is a plane defined for the convenience of explaining this application. The housing 112 is used to be connected to a lower fork arm (not shown), which is responsible for transmitting wheel momentum and driving the housing 112 to perform linear motion. When the housing 112 is in the initial position (such as Figure 3 When the housing 112 is at the first extreme position (not shown), the first limiting member 121 abuts against the second limiting member 130.

[0065] According to the linear motor 110 of the present application, the housing 112 of the mover 111 is sleeved on the outside of the stator 114, and the mover 111 and the stator 114 can move relative to each other in the axial direction to realize the axial extension and compression of the entire linear motor 110; the stroke of the mover 111 moving upward from the initial position to the second extreme position is recorded as the upper stroke of the linear motor 110, and the mover 111 moving downward from the initial position to the first extreme position is recorded as the lower stroke of the linear motor 110; in the lower stroke, the effective connection length between the stator 114 and the mover 111 is recorded as the first effective connection length, and in the upper stroke, the effective connection length between the stator 114 and the mover 111 is recorded as the second effective connection length. Among them, the first effective connection length is less than the second effective connection length.

[0066] According to the linear motor 110 of the present application, see Figure 3For example, the stator 114 may include a winding 115, and the winding 115 is disposed in a stator core of the stator 114. Specifically, the stator core includes a plurality of stator core sheets, the plurality of stator core sheets are arranged along the axial direction of the stator, and stator slots are formed between the plurality of stator core sheets, and the winding 115 is disposed in the stator slots, so that the entire stator core generates a magnetic field.

[0067] The mover 111 further includes a magnetic steel 113 . The magnetic steel 113 is located outside the stator 114 and fixed to the housing 112 .

[0068] According to the linear motor 110 of the present application, the first effective combination length is: the relative axial length of the stator core and the magnetic steel 113 in any state in the downstroke; the second effective combination length is: the relative axial length of the stator core and the magnetic steel 113 in any state in the upstroke.

[0069] According to the linear motor 110 of the present application, the relationship between the first effective combination length and the second effective combination length of the downstroke and the upstroke is set to achieve different thrust performances of the linear motor in the downstroke and the upstroke. Specifically, the first effective combination length of the linear motor 110 in the downstroke is less than the second effective combination length in the upstroke, so that the thrust of the linear motor 110 in the downstroke is less than the thrust in the upstroke. In the field of linear motors, the thrust of a linear motor is proportional to the effective combination area of ​​the stator core and the magnetic steel. The larger the effective combination area, the greater the thrust of the linear motor, and the smaller the effective combination area, the smaller the thrust of the linear motor; the effective combination area here refers to the area corresponding to the stator core and the magnetic steel of the linear motor in the axial direction. Since the radial size of the linear motor is relatively fixed, the size of the effective combination area is determined by the effective combination length. That is, the larger the effective combination length, the greater the thrust of the linear motor, and the smaller the effective combination length, the smaller the thrust of the linear motor. According to the linear motor 110 of the present application, the first effective coupling length of the downstroke is smaller than the second effective coupling length of the upstroke, so that the thrust of the upstroke of the linear motor is greater than the thrust of the downstroke, so as to meet the requirements that the linear motor needs a stable and large thrust in the upstroke and a smaller thrust as a buffer force in the downstroke, thereby achieving different thrust performances in the upstroke and downstroke. At the same time, it can also prevent the problem that the linear motor descends slowly or even cannot descend due to excessive thrust in the downstroke, thereby ensuring the accuracy and stability of the linear motor control.

[0070] according to Figure 3As shown, the initial position is between the first limit position and the second limit position. The shell 112 moves toward the first limit position to move in a direction away from the fixed seat 100. The shell 112 moves toward the second limit position to move in a direction close to the fixed seat 100. The end of the stator core away from the fixed seat 100 along the first direction D1 (i.e., the lower end face of the stator core) and the end of the magnetic steel 113 away from the fixed seat 100 along the first direction D1 (i.e., the lower end face of the magnetic steel) are aligned in the axial direction. In this way, the effective combination length of the stator core and the magnetic steel 113 changes during the movement of the shell 112 from the initial position to the first limit position, that is, the first effective combination length changes, and the closer to the first limit position, the first effective combination length gradually decreases. When the shell 112 moves from the initial position to the second limit position, the effective combination length of the stator core and the magnetic steel 113 remains unchanged, that is, the second effective combination length remains unchanged.

[0071] To ensure the realization of the above technical effects, the axial size of the magnetic steel of the linear motor 110 of the present application is smaller than the axial size of the stator core to ensure that the linear motor can move axially between the first extreme position and the second extreme position.

[0072] Similarly, to ensure that the mover 111 can move axially outside the stator 114, the axial dimension of the mover 111 is larger than the axial dimension of the stator core to provide space for movement.

[0073] See also Figure 3 For example, a bearing assembly 117 may be provided between the mover 111 and the stator 114 to reduce the friction force when the mover 111 moves along a straight line relative to the stator 114. The bearing assembly 117 may be a sliding bearing.

[0074] For example, the housing 112 may be configured as a cylinder, wherein the cylinder may have a circular, elliptical or polygonal cross section.

[0075] In an example of the present application, the electromagnetic vibration reduction device may include at least two first stoppers 121. At least two first stoppers 121 are arranged around the shell 112 along the circumferential direction. For example, the first stoppers 121 may be configured as long strips or long ribs. The long strips or long ribs here may be arranged along the circumferential direction of the shell 112. The long strips or long ribs here may also be arranged along the circumference of the shell 112 at uniform intervals.

[0076] In another example of the present application, the first position limiting member 121 is configured as an annular member, which is sleeved on the outer side of the housing 112. For example, the first position limiting member 121 here is configured as a disc structure.

[0077] See also Figures 1 to 3In addition, the electromagnetic vibration reduction device may further include a connecting member 120 . The connecting member 120 is located outside the housing 112 and is connected to the first limiting member 121 and the fixing seat 100 .

[0078] For example, the connecting member 120 can be configured as a cylindrical structure. The connecting member 120 is sleeved on the outer side of the linear motor 110. The connecting member 120, the fixing seat 100 and the first limiting member 121 together define an accommodating cavity 122. The second limiting member 130 is located in the accommodating cavity 122.

[0079] exist Figure 3 In the example shown, the connecting member 120 and the first limiting member 121 are constructed as an integral component. Alternatively, it can be understood that the first limiting member 121 is constructed as a part of the connecting member 120 .

[0080] For example, the second limiting member 130 can be configured as a cylinder, an annular plate, a long plate, a long rib, etc.

[0081] Optionally, the connecting member 120 may be provided with a weight-reducing hole 120a. By providing the weight-reducing hole 120a, the weight of the connecting member 120 may be reduced, the state of the spring 180 may be observed from the weight-reducing hole 120a, and corresponding maintenance operations may also be performed from here.

[0082] See also Figure 3 In addition, the electromagnetic vibration reduction device may further include a first buffer 150. The first buffer 150 is located outside the housing 112. The first buffer 150 is connected to at least one of the first stopper 121 and the second stopper 130. It can be understood here that the first buffer 150 can be connected to any one of the first stopper 121 and the second stopper 130. The first buffer 150 can also be connected to both the first stopper 121 and the second stopper 130. The orthographic projection of the first buffer 150 in the second plane perpendicular to the first direction D1 at least partially overlaps with the orthographic projection of the first stopper 121 and the second stopper 130 in the second plane. The second plane here is a plane defined for the convenience of explaining this application. The second plane is parallel to the above-mentioned first plane. When the housing 112 is located at the first extreme position, the first buffer 150 contacts the other of the first stopper 121 and the second stopper 130. The first buffer 150 is used to buffer the force between the first stopper 121 and the second stopper 130.

[0083] exist Figure 3 In the example shown, the first buffer member 150 is connected to the first stop member 121. The first buffer member 150 and the first stop member 121 can be installed by bonding, snap-fitting, nesting, or the like.

[0084] For example, the first buffer 150 may be configured as a soft elastic structure such as a rubber pad, etc. The first buffer 150 may contact the housing 112, thereby increasing the resistance to the movement of the housing 112 during the movement of the housing 112, thereby improving the shock absorbing effect.

[0085] Optionally, the first buffer member 150 is configured as an annular rubber pad. The outer periphery of the annular rubber pad is connected to the first stopper 121. The inner periphery of the annular rubber pad is attached to the housing 112. In this way, the gap between the housing 112 and the first stopper 121 can be sealed, and the damping force of the movement of the housing 112 can be increased.

[0086] See also Figure 3 , further, the housing 112 can also be configured to be able to move to a second limit position (not shown) relative to the stator 114 along the first direction D1. At this point, the housing 112 can move to an initial position, a first limit position, and a second limit position relative to the stator 114. The electromagnetic vibration reduction device can also include a third limiter 116a and a fourth limiter 140. The third limiter 116a is located on the inner side of the housing 112 and is fixedly arranged relative to the stator 114. The fourth limiter 140 is fixedly arranged relative to the housing 112. Among them, when the housing 112 is located in the initial position, the third limiter 116a is spaced apart from the fourth limiter 140. The orthographic projection of the fourth limiter 140 in a third plane perpendicular to the first direction D1 at least partially overlaps with the orthographic projection of the third limiter 116a in the third plane. The third plane here is a plane defined for the convenience of explaining this application. The third plane is parallel to the above-mentioned first plane. When the housing 112 is located at the second limit position, the third limiting member 116a abuts against the fourth limiting member 140. Here, the retraction stroke of the housing 112 is limited by the cooperation between the third limiting member 116a and the fourth limiting member 140.

[0087] In the example shown in the figure, the third stopper 116 a may also be configured as an end of the stator 114 away from the fixing seat 100 along the first direction D1 . That is, the third stopper 116 a is a part of the stator 114 .

[0088] See also Figure 3In addition, the electromagnetic vibration reduction device may further include a second buffer 160. The second buffer 160 is connected to at least one of the third limit member 116a and the fourth limit member 140. The orthographic projection of the second buffer 160 in the fourth plane perpendicular to the first direction D1 at least partially overlaps with the orthographic projections of the third limit member 116a and the fourth limit member 140 in the fourth plane. The fourth plane here is a plane defined for the convenience of explaining this application. The fourth plane is parallel to the above-mentioned first plane. When the shell 112 is located at the second extreme position, the second buffer 160 contacts the other of the third limit member 116a and the fourth limit member 140. The second buffer 160 is used to buffer the force between the third limit member 116a and the fourth limit member 140.

[0089] In the illustrated example, the second buffer member 160 is connected to the fourth limiting member 140 .

[0090] For example, the second buffer member 160 may be configured as a soft elastic structure such as a rubber pad.

[0091] For example, the third limit member 116a here can be configured as a third limit plate. The third limit member 116a is located at the end of the stator 114 away from the fixed seat along the first direction D1. For example, the third limit plate can be fixed to the end of the iron core of the stator 114. The third limit plate here can be an annular plate. The fourth limit member 140 can be configured as a fourth limit plate. The fourth limit plate is located at the end of the shell 112 away from the fixed seat along the first direction D1. The fourth limit plate here can be a circular plate or an annular plate. Figure 3 From the perspective of FIG. 1 , the shell 112 is a tubular structure, and the fourth limiting plate closes the end of the shell 112 , so that the fourth limiting plate and the shell 112 enclose a cylindrical cavity with one end closed and the other end open.

[0092] Preferably, the difference between the length of the winding 115 along the first direction D1 and the length of the magnetic steel 113 along the first direction D1 is greater than or equal to the length of the movement of the housing 112 from the initial position to the second limit position, so as to ensure that the housing 112 does not interfere with other structures when moving to the second limit position.

[0093] Optionally, the magnetic steel 113 here may be a magnetic steel.

[0094] like Figure 3 As shown, schematically, part of the winding 115 is located along the first direction D1 on a side of the first limiting member 121 away from the fixing base 100 .

[0095] See also Figures 1 to 5Further, the stator 114 includes a core shaft 116. The winding 115 is arranged on the outside of the core shaft 116. The core shaft 116 passes through the fixed seat 100 along the first direction D1 and extends to the outside of the fixed seat 100. The electromagnetic vibration reduction device may also include a heat conductor 210 and a heat sink 220. The heat conductor 210 is extended along the first direction D1 and connected to the core shaft 116. The heat sink 220 is located on the side of the fixed seat 100 away from the housing 112. The heat sink 220 is connected to the heat conductor 210. The heat conductor 210 here is used to receive heat via the core shaft 116 when the winding 115 is energized and generates heat. The heat is transferred to the heat sink 220 via the heat conductor 210 and is dissipated by the heat sink 220.

[0096] In the example shown in the figure, the third stopper 116 a is configured as an end portion of the core shaft 116 away from the fixing seat 100 along the first direction D1. That is, the third stopper 116 a is a portion of the core shaft 116.

[0097] See also Figure 2 , Figure 4 as well as Figure 5 For example, the electromagnetic vibration reduction device includes at least two heat conducting members 210. The at least two heat conducting members 210 are arranged at intervals along the circumference of the core shaft 116.

[0098] See also Figure 2 and Figure 3 For example, the mandrel 116 is configured as a hollow shaft. An installation groove (not shown) is provided on the inner wall of the hollow shaft. The installation groove is extended along the first direction D1. The heat conducting member 210 is connected to the installation groove. This facilitates the installation of the heat conducting member 210 and improves the space utilization rate of the shaft hole of the mandrel 116. At the same time, this makes the heat conducting member 210 closer to the winding 115 in the radial direction, thereby improving the heat exchange efficiency.

[0099] See also Figures 1 to 5 The heat conducting member 210 of the present application can be constructed as a heat conducting pipe. The heat dissipating member 220 can be constructed as a heat dissipating fin. The mandrel 116 has a mounting groove extending from one end of the mandrel 116 to the other end. The heat conducting pipe is placed in the mounting groove. The heat dissipating fin is welded to the portion of the heat conducting pipe extending out of the fixing seat 100. The heat dissipating fin is arranged in an axial array along the mandrel 116. Figure 4 The heat pipe runs through the stator 114 core shaft 116, and the top is connected to the heat dissipation fin. Figure 4 The top of the mandrel 116 is viewed from the perspective of FIG.

[0100] Furthermore, a fan (not shown) may be provided beside the heat dissipation fins to improve the heat dissipation efficiency, thereby improving the condensation efficiency of the medium in the heat pipe, and the heat dissipation fins may also be cooled by natural wind during vehicle driving.

[0101] For example, the heat pipe can be selected as a two-phase closed thermosyphon (not shown), also known as a gravity heat pipe. The gravity heat pipe includes a tube shell, an absorption core and an end cap. The gravity heat pipe is divided into a heating section and a cooling end along the height direction. The heating section is at the bottom and the cooling section is at the top. The reflux of the working liquid can be satisfied by gravity, and a tube core with a capillary structure is not required. Heat is transferred by evaporation and condensation of the liquid in a fully enclosed vacuum tube. The working liquid has a low boiling point and is easy to volatilize. The absorption core is made of capillary porous material. The lower part of the gravity heat pipe is the evaporation section and the upper part is the condensation section. When the lower part of the heat pipe is heated, the liquid phase medium quickly evaporates into a gas phase and flows to the condensation section under the action of the pressure difference. The gas phase medium recondenses into a liquid phase medium after releasing heat in the condensation section, and the liquid phase medium flows back to the evaporation section by the action of its own gravity.

[0102] See also Figure 3 In addition, the electromagnetic vibration reduction device may further include a displacement sensor 170. The displacement sensor 170 includes a first sensing portion 171 and a second sensing portion 172. One of the first sensing portion 171 and the second sensing portion 172 is connected to the mover 111. The other of the first sensing portion 171 and the second sensing portion 172 is connected to the stator 114. The displacement sensor 170 is configured to detect the displacement of the mover 111 relative to the stator 114 along the first direction D1. One of the first sensing portion 171 and the second sensing portion 172 may be configured as a magnetic element, and the other may be configured as a Hall element.

[0103] For example Figure 3 As shown, the second sensing part 172 is configured as a magnetic strip of a displacement sensor. The magnetic strip is connected to the mover of the linear motor, such as the fourth limiter 140. The first sensing part 171 is configured as a detection circuit board with a Hall element. The detection circuit board is fixed to the stator of the linear motor, such as the core shaft. When the linear motor performs linear motion, it will drive the magnetic strip to move, and then the detection circuit board will sense.

[0104] Further, the fourth position limiting member 140 can be constructed as an annular plate, and one end of the magnetic strip can be embedded in the inner hole of the annular plate. The outer diameter of the annular plate here can be consistent with the outer diameter of the shell 112. The third position limiting member 116a can be constructed as another annular plate. The detection circuit board can be fixed to the inner hole of the other annular plate. A through hole is provided in the middle of the detection circuit board here. The magnetic strip can be movably inserted into the through hole. The second buffer member 160 is located on the inner side of the shell 112 and fixed to the surface of the fourth position limiting member 140 facing the fixed seat 100. The second buffer member 160 is located on the outside of the magnetic strip. When the second buffer member 160 is an integral component, the magnetic strip passes through the second buffer member 160.

[0105] See also Figure 1 and Figure 3In addition, the electromagnetic vibration reduction device may further include a spring 180. The spring 180 is sleeved on the outside of the linear motor 110. And the spring 180 is limitedly fitted between the fixing seat 100 and the second limiting member 130 along the first direction D1. The spring 180 is used to reduce vibration when the vehicle is bumped. The spring 180 releases energy during the recovery process after absorbing vibration energy. This part of energy can be offset by the reverse force applied by the linear motor 110, so that the damping force of the spring 180 during the recovery process is increased, thereby suppressing the bouncing of the vehicle and improving the stability of the vehicle.

[0106] See also Figure 3 In addition, the electromagnetic vibration reduction device may further include a protective cover 190. The protective cover 190 is constructed as a structure that can be deformed along the first direction D1. The protective cover 190 is sleeved on the outside of the shell 112. One end of the protective cover 190 along the first direction D1 is fixed relative to the fixing seat 100. The other end of the protective cover 190 along the first direction D1 is fixed relative to the shell 112 to cover the stator 114. By providing a dust cover, the winding 115 can be protected to prevent foreign matter such as dust from invading and affecting the operation of the linear motor 110, which is conducive to reducing the failure rate.

[0107] For example, the protective cover 190 here can be selected to use the structure of an accordion-type protective cover using the related art.

[0108] exist Figure 1 and Figure 3 As can be seen from the example shown, the spring 180 is located in the accommodating cavity 122 and is surrounded by the cylindrical connecting member, and the spring 180 is located outside the protective cover.

[0109] Continue to refer to Figure 3 In addition, the electromagnetic vibration reduction device may further include a reinforcing plate 240, a rubber member 250 and a support plate 230 located in the accommodating cavity 122. The reinforcing plate 240 is connected to the core shaft 116. The rubber member 250 is located at least on both sides of the reinforcing plate 240 in a straight line direction. That is, the core shaft 116 is indirectly connected to the rubber member 250 through the reinforcing plate 240. The function of the rubber member 250 is to absorb the vibration energy of the core shaft 116 in a straight line direction. The support plate 230 is connected to the fixing seat 100. The support plate 230 and the reinforcing plate 240 can be constructed as sheet metal parts. The fixing seat 100, the support plate 230, and the rubber member 250 are surrounded to form a rubber chamber. The reinforcing plate 240 is placed in the rubber chamber. In terms of technology, the fixing seat 100 and the support plate 230 can be made into an integral part, which functions to transmit force to the vehicle body. The support plate 230 can be arranged axially spaced from the winding of the stator 114.

[0110] Optionally, a soft vibration-damping pad such as rubber may be installed in the gap between the stator winding and the support plate 230 . The core shaft 116 of the stator 114 penetrates the fixing seat 100 and is fixedly installed to the fixing seat 100 .

[0111] The initial state of the present application is set so that the bottom of the winding 115 of the stator 114 is flush with the bottom of the magnet. When the housing 112 of the linear motor 110 moves upward, the effective bonding area of ​​the winding 115 and the magnet remains unchanged. However, when the housing 112 of the linear motor 110 moves downward, the effective bonding area of ​​the winding 115 and the magnet changes. The effect brought about by this setting is that the restoring damping force provided by the electromagnetic vibration reduction device is greater than the compression damping force, which can quickly convert the vibration energy into heat energy and release it into the environment, and finally achieve a rapid vibration reduction effect. At the same time, this structural design also reduces the difficulty of using software debugging to make the restoring damping force greater than the compression damping force. And this design can shorten the length of the linear motor 110, save axial space, and shorten the stator 114 period while meeting the actual output thrust requirements, so that the reverse voltage of the linear motor 110 decreases and the input current increases.

[0112] The upper stroke mechanical limit of the present application relies on the fourth limiter 140 and the second buffer 160. The distance from the bottom of the mandrel 116 to the second buffer 160 is the upper stroke. The bottom of the mandrel 116 here can be constructed as the third limiter 116a mentioned above. The lower stroke mechanical limit of the present application relies on the first limiter 121 and the first buffer 150. The distance from the second limiter 130 to the first buffer 150 is the lower stroke.

[0113] When the vehicle suspension is installed with this electromagnetic vibration reduction device, the vehicle's Z-direction smoothness can be actively controlled and a certain amount of energy can be recovered by providing axial thrust. The Z direction here can be understood as the height direction of the vehicle. When passing through a bumpy road, the body and the wheel transmit force through the fixed seat 100, the shell 112 and the lower fork arm respectively to compress the spring 180. In order to offset the elastic potential energy of the spring 180, the linear motor 110 provides a damping force. The energy consumption is mainly in the form of heat energy generated when the linear motor 110 is in operation and the friction between the mover 111 and the bearing assembly 117.

[0114] In a traditional vibration reduction device, the spring absorbs ground vibration and converts mechanical energy into elastic potential energy. If there is no damper, the spring needs to move repeatedly to achieve the effect of consuming elastic potential energy, that is, it takes a long time to consume energy in a cycle, which reduces the comfort of the whole vehicle. The function of the damper is to increase energy consumption during each expansion and contraction of the spring, convert potential energy into heat energy and release it into the environment, and finally achieve the effect of rapid energy consumption. Simply put, the damper is used to suppress the impact generated when the spring 180 recovers its deformation after vibration reduction, that is, to suppress spring jump. The present application is an electromagnetic vibration reduction device with variable effective length. Compared with the traditional vibration reduction device, the present application uses a linear motor to replace the passive damper in the traditional vibration reduction device. It can be said that the linear motor is an active damper. The effect brought by the effective combination of the variable area design in the present application is that the restoring damping force provided by the electromagnetic vibration reduction device is greater than the compression damping force. In the compression stroke, that is, the process of the axle and the frame approaching each other, the compression damping force is small, and the elastic effect of the spring can be fully exerted to mitigate the impact. If the compression damping force is too large, the impact and vibration from the road surface will be transmitted to the vehicle body. In the extension stroke (restoration stroke), the vibration is mainly in the tire, and the body is less sensitive, so the restoring damping force can be larger, and the larger restoring damping force can quickly dissipate the elastic potential energy of the spring from full compression to rebound recovery. The lower compression damping force and higher high restoring damping force can compensate for a certain degree of vehicle handling. For example, when the vehicle is turning, the smaller damping force on the compression side will cause the body posture to tilt, while the higher restoring damping force on the other side will compensate for it, allowing the body posture to be maintained at an appropriate level. The distance between the bottom of the core shaft 116 of the stator 114 of the present application and the second buffer 160 is the upstroke. When the mover 111 moves upward, the second buffer 160 is used as a mechanical limit structure for the upstroke, and absorbs the impact between the buffer mover 111 and the stator 114. The distance between the second limit member 130 and the first buffer 150 of the present application is the downstroke. The connector 120 is fixedly matched with the fixing seat 100 by a nut. When the mover 111 moves downward, the first buffer 150 rubs against the housing 112. When the mover 111 reaches the first limit position, the second limit member 130 moving with the housing 112 contacts the first buffer 150. At this time, the first buffer 150 becomes a mechanical limit structure of the lower stroke.

[0115] The present application also provides a vehicle. The vehicle may include a vehicle body, a vehicle axle, and the electromagnetic vibration reduction device as described above. The fixing seat 100 is connected to the vehicle body. The housing 112 is connected to the vehicle axle.

[0116] According to the vehicle of the present application, by applying the above-mentioned electromagnetic vibration reduction device, it is helpful to reliably limit the upward adjustment range of the vehicle body relative to the axle, so as to improve the stability of the vehicle body.

[0117] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of this application. The terms used herein are only for describing specific implementation purposes and are not intended to limit this application. Terms such as "setting" appearing in this article can mean that one component is directly attached to another component, or that one component is attached to another component through an intermediate. Features described in this article in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

[0118] The present application has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, and are not intended to limit the present application to the described embodiments. It can be understood by those skilled in the art that more variations and modifications can be made according to the teachings of the present application, and these variations and modifications all fall within the scope of protection claimed in the present application.

Claims

1. A linear motor, characterized in that: The linear motor comprises: mover and stator; The mover is sleeved on the outside of the stator and the mover and the stator can move relative to each other in the axial direction; The downward movement of the mover from the initial position to the first limit position is recorded as a downstroke, and the upward movement of the mover from the initial position to the second limit position is recorded as an upstroke; In the downstroke, the effective combination length between the stator and the mover is a first effective combination length, and in the upstroke, the effective combination length between the stator and the mover is a second effective combination length; Wherein, the first effective binding length is smaller than the second effective binding length.

2. The linear motor according to claim 1, characterized in that: The second effective binding length remains unchanged; During the downstroke, the first effective coupling length gradually decreases.

3. The linear motor according to claim 1, characterized in that: The stator comprises a winding and a stator core, wherein the winding is arranged on the stator core; The mover includes magnetic steel; The first effective combination length is: the relative axial length between the stator core and the magnetic steel in any state in the downstroke; The second effective combination length is: the relative axial length between the stator core and the magnetic steel in any state in the upstroke.

4. The linear motor according to claim 1, characterized in that: The stator further comprises a stator core, the winding is arranged on the stator core, the mover comprises a magnetic steel, and the axial dimension of the magnetic steel is smaller than the axial dimension of the stator core; and / or In the initial position, the lower end surface of the stator core is aligned with the lower end surface of the magnetic steel in the axial direction.

5. An electromagnetic vibration reduction device, characterized in that: The electromagnetic vibration reduction device comprises: A fixing seat, the fixing seat being used to connect to a body of a vehicle; and According to any one of claims 1 to 4, the stator is fixedly arranged relative to the fixing seat; A first limiting member, the first limiting member is located outside the mover and is fixed relative to the fixing seat; and a second limiting member, the second limiting member being located outside the housing of the mover and fixed relative to the housing; the second limiting member being located axially between the fixing seat and the first limiting member; The first limit member and the second limit member move relative to each other in the axial direction along with the mover and the stator. When the first limit member contacts the second limit member, the linear motor is at the second limit position of the upper stroke.

6. The electromagnetic vibration reduction device according to claim 5, characterized in that: The electromagnetic vibration reduction device also includes: a third stopper, the third stopper being located at an inner side of the mover and being fixed relative to the stator; and a fourth limiting member, wherein the fourth limiting member is fixedly arranged relative to the housing; The third limit member and the fourth limit member move relative to each other in the axial direction as the mover and the stator move. When the third limit member contacts the fourth limit member, the linear motor is at the first limit position of the lower stroke.

7. The electromagnetic vibration reduction device according to claim 6, characterized in that: The electromagnetic vibration reduction device also includes: A first buffer member is connected to at least one of the first limiting member and the second limiting member.

8. The electromagnetic vibration reduction device according to claim 7, characterized in that: The electromagnetic vibration reduction device also includes: A second buffer member connected to at least one of the third limiting member and the fourth limiting member.

9. The electromagnetic vibration reduction device according to claim 5, characterized in that: The electromagnetic vibration reduction device also includes: A spring is sleeved on the outside of the linear motor, and the spring is limitedly fitted between the fixing seat and the second limiting member along the first direction.

10. The electromagnetic vibration reduction device according to claim 9, characterized in that: The electromagnetic vibration reduction device also includes: The protective cover is constructed as a structure capable of deforming along the axial direction, the protective cover is sleeved on the outside of the shell, one end of the protective cover along the axial direction is fixed relative to the fixing seat, and the other end of the protective cover along the axial direction is fixed relative to the shell to shield the stator.

11. A vehicle, characterized in that: The vehicle comprises: the body of the vehicle; and The electromagnetic vibration reduction device according to any one of claims 5 to 10, wherein the fixing seat is connected to the vehicle body.

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