Three-phase connection structure of brushless motor and actuator

Abstract

The invention relates to a three-phase connection structure for a brushless motor, which comprises a stator of the brushless motor and a plurality of connection terminals, the stator is provided with a conductive wire group, and the plurality of connection terminals are distributed in the circumferential direction of the stator. Wherein each connecting terminal in the plurality of connecting terminals comprises a circuit board plugging end, a winding end and a fixing end, the circuit board plugging end is configured to be capable of being plugged into a circuit board so as to keep electrical connection with the circuit board, and the winding end is configured to be electrically connected with the conductive wire group; the fixed end is arranged between the circuit board plugging end and the winding end and is configured to fixedly connect each of the plurality of connecting terminals with the stator, and the circuit board plugging end and the winding end extend in different directions at a certain angle. The terminal winding end is arranged in the radial direction of the shell on the outer side of the brushless motor, so that the distance between the PCB and the brushless motor is smaller than that in the prior art, and the structure is more compact.

Description

Technical Field

[0001] The present application relates to a three-phase connection structure of a motor and an actuator, and in particular to a three-phase connection structure of a brushless motor suitable for a charging port of a new energy vehicle and an actuator having the brushless motor. Background Art

[0002] At present, new energy vehicles on the market, especially electric vehicles, need to be equipped with charging seats. The DC or AC charging port is set inside the charging seat, and the charging port is exposed and closed by a charging door set outside the charging seat. When the operator is charging the electric vehicle, especially on rainy days, if he touches the charging door of the charging seat directly with his hands, he may face the risk of electric shock. Therefore, an electrically controlled charging door is designed, that is, the opening and closing of the charging door can be controlled by the control panel inside the vehicle, thereby avoiding the risk of direct human contact with the charging door, and also meeting the development trend of automation and functionalization of electric vehicles. Summary of the invention

[0003] The electrically controlled charging door requires an actuator to control the opening and closing of the charging door. However, the space inside the electric vehicle that can accommodate the actuator is very limited. Therefore, a very compact actuator is required, that is, the actuator needs to be optimized in three dimensions: length, width, and height so that it can adapt to the space requirements of the internal assembly of the electric vehicle.

[0004] The fisheye terminal inside the actuator that is connected to the printed circuit board (hereinafter referred to as "PCB") is usually electrically connected to the PCB by interference fit. The connection hole on the PCB for receiving the fisheye terminal is circular, and the cross-section of the matching part of the fisheye terminal and the PCB is approximately rectangular, which causes the connection hole of the PCB to be severely deformed when the fisheye terminal and the PCB are interfered with, and the insertion force of the fisheye terminal is also large. Therefore, it is necessary to improve the interference fit connection between the fisheye terminal and the PCB to reduce the deformation of the connection hole of the PCB and reduce the insertion force of the fisheye terminal.

[0005] Based on the technical problems existing in the above-mentioned prior art, the present application provides a three-phase connection structure of a brushless motor. By improving the shape of the fisheye terminal itself and the arrangement of the fisheye terminal on the stator of the brushless motor, not only the effective use area of ​​the PCB board is increased, but also the arrangement of the PCB board and the stator of the brushless motor is more compact, thereby minimizing the overall dimension of the PCB board and the gap between the PCB board and the stator of the brushless motor, so that the volume and various dimensions of the actuator housing accommodating the brushless motor are reduced as much as possible, which is beneficial for the actuator to adapt to the needs of the compact space inside the electric vehicle.

[0006] On the other hand, the present application provides a three-phase connection structure of a brushless motor. By improving the cross-sectional shape of the interference fit part between the fisheye terminal and the PCB board, when the fisheye terminal is interference fit connected to the PCB board, the deformation of the PCB board connection hole is reduced compared with the prior art, and the insertion force of the fisheye terminal is also reduced compared with the prior art.

[0007] Therefore, according to the first aspect of the present application, a three-phase connection structure for a brushless motor is provided, characterized in that it includes a stator and a plurality of connection terminals of the brushless motor, a conductive wire group is arranged on the stator, and the plurality of connection terminals are distributed in the circumferential direction of the stator, wherein each of the plurality of connection terminals includes a circuit board plug-in end, a winding end and a fixed end, the circuit board plug-in end is configured to be inserted into a circuit board so as to maintain electrical connection with the circuit board, the winding end is configured to be electrically connected to the conductive wire group, the fixed end is arranged between the circuit board plug-in end and the winding end, and is configured to fixedly connect each of the plurality of connection terminals to the stator, wherein the circuit board plug-in end and the winding end extend in different directions at a certain angle to each other.

[0008] According to a first aspect of the present application, it is characterized in that the circuit board plug-in end extends upward along the axial direction of the stator, and the winding end extends outward along the radial direction of the stator.

[0009] According to the first aspect of the present application, it is characterized in that the stator has a plurality of terminal fixing parts, each of the plurality of terminal fixing parts is configured to accommodate the fixed end of each of the plurality of connecting terminals, and the portion of each of the plurality of connecting terminals that contacts each of the plurality of terminal fixing parts is treated by overmolding so that each of the plurality of connecting terminals maintains insulated contact with the stator.

[0010] According to a first aspect of the present application, it is characterized in that the circuit board is disposed above the stator in the axial direction, and the circuit board and the stator are compactly arranged in the axial direction.

[0011] According to a first aspect of the present application, it is characterized in that the plurality of connection terminals are three connection terminals, and the plurality of terminal fixing portions are three terminal fixing portions.

[0012] According to the first aspect of the present application, it is characterized in that each of the three connecting terminals is an irregular L-shaped terminal, and the fixed end of the irregular L-shaped terminal has a first bend portion, a second bend portion and a fixed end extension portion arranged between the first bend portion and the second bend portion; wherein the first bend portion is bent and extended from under the circuit board plug-in end at a first angle, the second bend portion is bent and extended from one end of the fixed end extension portion relative to the first bend portion at a second angle and is connected to the winding end, and the fixed end extension portion extends in an extension direction different from that of the circuit board plug-in end and the winding end.

[0013] According to the first aspect of the present application, it is characterized in that the fixed end extension portion extends in a third direction different from the axial direction and the radial direction, the third direction is perpendicular to the axial direction and the third direction is perpendicular to the radial direction, wherein each of the three or more terminal fixing portions has an axial opening and a radial opening, and the axial opening and the radial opening are arranged at a certain distance along the circumferential direction of the stator, wherein the circuit board plug-in end of the special-shaped L-shaped terminal extends upward from the axial opening along the axial direction, and the winding end of the special-shaped L-shaped terminal extends outward from the radial opening along the radial direction.

[0014] According to a first aspect of the present application, it is characterized in that the three connection terminals are distributed at certain angles in the circumferential direction of the stator outer shell.

[0015] According to the first aspect of the present application, it is characterized in that each of the three connecting terminals is an L-shaped terminal, and the fixed end of the L-shaped terminal is L-shaped, so that the circuit board plug-in end and the winding end of the L-shaped terminal extend in different directions at a certain angle to each other.

[0016] According to the first aspect of the present application, it is characterized in that each of the three terminal fixing portions has an axial opening and a radial opening, the axial opening is arranged above the radial opening along the axial direction, wherein the circuit board plug-in end of the L-shaped terminal extends upward from the axial opening along the axial direction, and the winding end of the L-shaped terminal extends outward from the radial opening along the radial direction.

[0017] According to a first aspect of the present application, it is characterized in that the three connection terminals are arranged side by side or in parallel in the circumferential direction of the stator outer shell.

[0018] According to the first aspect of the present application, it is characterized in that it also includes a grounding terminal, one end of which can be inserted into the circuit board to maintain electrical connection with the circuit board, and the other end of the grounding terminal can be inserted into the stator to maintain electrical connection with the stator; wherein the grounding terminal is configured to maintain electrical connection between the circuit board and the stator of the brushless motor.

[0019] According to the first aspect of the present application, it is characterized in that a plurality of sockets corresponding to the number of the plurality of connecting terminals and the grounding terminals are provided on the circuit board, and the plurality of connecting terminals and the grounding terminals are electrically connected to the plurality of sockets by interference fit.

[0020] According to the first aspect of the present application, it is characterized in that the parts where the multiple connecting terminals and the grounding terminals are in interference fit contact with the multiple sockets are provided with rounded corners, so as to avoid stress concentration when the multiple connecting terminals and the grounding terminals are plugged into the multiple sockets.

[0021] According to the first aspect of the present application, it is characterized in that the brushless motor includes the stator, which is arranged on the outside of the brushless motor, and the brushless motor also includes a rotor arranged on the inside of the stator, and the rotation axis of the rotor coincides with the central axis of the stator; wherein when the conductive wire group is energized, the rotor is configured to rotate clockwise or counterclockwise along the rotation axis.

[0022] According to the first aspect of the present application, it is characterized in that the brushless motor and the circuit board are arranged inside the actuator, and the winding ends of the multiple connecting terminals extending outward in the radial direction are distributed at the installation gap between the brushless motor and the inner wall of the actuator housing, or the winding ends of the multiple connecting terminals extending outward in the radial direction are distributed at the corners of the inner wall of the actuator housing, thereby increasing the utilization rate of the internal space of the actuator.

[0023] According to a second aspect of the present application, an actuator is provided, characterized in that it includes the three-phase connection structure as described in the first aspect of the present application, and the actuator also includes: an actuator housing, a rotor of the brushless motor and a circuit board, wherein the stator of the brushless motor is arranged on the outside of the brushless motor, and the rotor is arranged on the inside of the stator, the rotation axis of the rotor coincides with the central axis of the stator, and the circuit board is arranged above the brushless motor in the axial direction, wherein the brushless motor and the circuit board are arranged inside the actuator housing, and the winding ends of the multiple connection terminals extending outward in the radial direction are distributed at the installation gap between the brushless motor and the inner wall of the actuator housing, or the winding ends of the multiple connection terminals extending outward in the radial direction are distributed at the corners of the inner wall of the actuator housing, thereby increasing the utilization rate of the internal space of the actuator.

[0024] According to a second aspect of the present application, it is characterized by further comprising a transmission assembly, wherein the transmission assembly is arranged inside the actuator housing, and the transmission assembly is configured to cooperate with the rotor so as to output the rotational torque of the rotor to an external structure.

[0025] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1A It is a three-dimensional diagram of the actuator 100 of the present application.

[0027] Figure 1B This is a three-dimensional diagram of the actuator 100 of the present application. To illustrate the internal structure of the actuator 100 , the actuator upper cover 102 and the actuator housing 104 are removed in the figure.

[0028] Figure 1C for Figure 1A and 1B An exploded view of the actuator 100 is shown.

[0029] Figure 2A It is a three-dimensional view of the input terminal assembly 134 of the present application.

[0030] Figure 2B It is a three-dimensional view of each input terminal in the input terminal assembly 134 of the present application.

[0031] Figure 3A It is a top view of the actuator 100 of the present application, which has the first embodiment of the three-phase connection structure of the brushless motor. In order to show more components inside the actuator 100, the actuator cover 102 and the PCB board 120 are hidden.

[0032] Figure 3B 1 is a three-dimensional view of the special-shaped L-shaped terminal 141.

[0033] Figure 3C It is a three-dimensional view of the ground terminal 144.

[0034] Figure 3D It is a schematic diagram of the special-shaped L-shaped terminals 141 , 142 , 143 and the ground terminal 144 cooperating with the brushless motor 140 .

[0035] Figure 3E It is a side view of the special-shaped L-shaped terminals 141 , 142 , 143 and the ground terminal 144 mating with the brushless motor 140 .

[0036] Figure 4A It is a three-dimensional diagram of the actuator 400 of the present application, which has a second embodiment of the three-phase connection structure of the brushless motor. In order to show more components inside the actuator 400, the actuator cover 102 is hidden.

[0037] Figure 4B This is a top view of the actuator 400 of the present application, which has a second embodiment of a three-phase connection structure of a brushless motor. In order to show more components inside the actuator 400, the actuator cover 102 and the PCB board 420 are hidden.

[0038] Figure 4C It is a three-dimensional view of the L-shaped terminal 403.

[0039] Figure 4D It is a schematic diagram of the L-shaped terminals 401 , 402 , 403 and the ground terminal 404 cooperating with the brushless motor 440 .

[0040] Figure 5A This is a schematic diagram of each insertion terminal in the present application having a rounded insertion end.

[0041] Figure 5B It is a top view of each insertion terminal of the present application having a rounded insertion end.

[0042] Figure 5C This is a schematic diagram of the interference fit between the rounded insertion ends of each insertion terminal in the present application and the PCB board. DETAILED DESCRIPTION

[0043] Various specific embodiments of the present application will be described below with reference to the accompanying drawings that form a part of the present application, but the present application is not limited thereby. It should be understood that although terms indicating directions, such as "upper", "lower", "left", "right", "front" and "rear", etc. are used in the present application to describe the orientation of various example structural parts and elements of the present application, these terms are used here only for the purpose of convenience of description and are determined based on the example orientations shown in the accompanying drawings. Since the embodiments of the present application can be arranged in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations.

[0044] The term "including" and its derivatives used in this application are intended to include but not limit. Unless otherwise specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two components, it can be a direct connection, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. Where possible, the same or similar reference numerals used in this application refer to the same components.

[0045] Figures 1A-1C The three-dimensional view and the exploded view of the actuator 100 of the present application are shown, wherein Figure 1A is a three-dimensional diagram of the actuator 100 of the present application, Figure 1B In order to show the internal structure of the actuator 100, the actuator cover 102 and the actuator housing 104 are removed. Figure 1C for Figure 1A and 1B An exploded view of the actuator 100 is shown.

[0046] like Figure 1A As shown, the actuator 100 includes an actuator cover 102 and an actuator housing 104, wherein the actuator housing 104 contains various components of the actuator 100, and an actuator interface 106 is provided at one end of the actuator housing 104 for accommodating an input terminal assembly 134 (see Figure 1B), the input receiving end of the terminal assembly 134 can be accommodated in the actuator interface 106 and extend outward, and is used to receive input power and control signals transmitted to the actuator 100. An output hole 110 is provided on one side of the actuator cover 102, which can expose the output mating portion 112 of the actuator 100 connected to the external output. The actuator 100 also includes an oil seal 108, which provides a sealing function for the actuator 100, so that the actuator 100 has an IP67 waterproof and dustproof grade, which can prevent foreign matter such as external impurities, water vapor, dust, etc. from entering the interior of the actuator, and also limit the leakage of internal lubricating grease to the outside, providing a sealed environment for the internal components of the actuator, which is beneficial to protecting the internal structure and components. At the same time, the oil seal 108 has a certain centering function for the output mating portion 112, which can stabilize the mating connection between the output mating portion 112 and the actuator cover 102.

[0047] like Figure 1B-1C As shown, the actuator 100 further includes an input terminal assembly 134, a PCB board 120, three L-shaped terminals 141, 142, 143, a grounding terminal 144, a brushless motor 140 and a gear transmission assembly 118 contained in the actuator housing 104. The input terminal assembly 134 is electrically connected to the PCB board 120, the PCB board 120 is electrically connected to the brushless motor 140 through the three L-shaped terminals 141, 142, 143 and the grounding terminal 144, and the brushless motor 140 is matched and connected to the gear transmission assembly 118 through the output tooth portion 132 of the rotor 130. The gear transmission assembly 118 has a gear set 113, 114, 115, 116, 117, and the end gear 117 of the gear set has an output matching portion 112, which can pass through the output hole 110 of the actuator upper cover 102 and is fixed at the output hole 110 through the output fixing ring 108, so as to be connected to the external output (such as the output rotating shaft) of the actuator 100. The output mating portion 112 can output a rotational torque, so the output mating portion 112 of the actuator can be controlled to output clockwise or counterclockwise rotation and torque by receiving input power and control signals through the input terminal assembly 134 .

[0048] In the embodiment of the present application, although the number of L-shaped terminals is set to three, those skilled in the art should know that in some other embodiments, the number of L-shaped terminals can be adjusted accordingly according to the number of slots in the motor winding group.

[0049] Continue as Figure 1CAs shown, the PCB board 120 has four input receiving holes 122, three output connection holes 126, one grounding hole 127, a motor rotor receiving hole 124 and a gear matching hole 128. The four input receiving holes 122 are used to form a conductive connection with each terminal of the input terminal assembly 134, the three output connection holes 126 are used to form a conductive connection with the three L-shaped terminals 141, 142, 143, and the grounding hole 127 is used to form a conductive connection with the grounding terminal 144. The input terminals, the three L-shaped terminals 141, 142, 143 and the grounding terminal 144 of the above-mentioned input terminal assembly 134 are inserted into the corresponding holes of the PCB board 120 by interference fit. The gear matching hole 128 can be used to accommodate the positioning shaft of the gear transmission assembly 118, so as to reasonably arrange the position of the gear transmission assembly 118 inside the actuator housing 104.

[0050] In the embodiment of the present application, although the number of input receiving holes is set to four, those skilled in the art should know that in some other embodiments, the number of input receiving holes can be adjusted accordingly according to different input requirements. In the embodiment of the present application, although the number of output connection holes is set to three, those skilled in the art should know that in some other embodiments, the number of output connection holes can be adjusted accordingly according to different numbers of motor line group slots.

[0051] Continue as Figure 1C As shown, the brushless motor 140 includes a rotor 130, a stator 138 and a rotor rotating shaft 136. The rotor 130 is arranged inside the stator 138 and can rotate around the rotor rotating shaft 136. The upper end of the rotor 130 is provided with a rotor matching portion 132 that matches the gear transmission assembly 118. The rotor matching portion 132 of the rotor 130 can pass through the motor rotor receiving hole 124 on the PCB board 120 to match with the gear transmission assembly 118, such as gear meshing. The stator 138 is sequentially arranged with three L-shaped terminal fixing portions 151, 152, 153 and a grounding terminal fixing portion 154 in the circumferential direction of its outer shell, which are used to fix the three L-shaped terminals 141, 142, 143 and a grounding terminal 144 respectively. The L-shaped terminal fixing parts 151, 152, 153 and the L-shaped terminals 141, 142, 143 are insulated and in contact with each other. Specifically, the parts of the L-shaped terminals 141, 142, 143 that are in contact with the L-shaped terminal fixing parts 151, 152, 153 are plastic coated, thereby forming a plastic gap between the L-shaped terminals 141, 142, 143 and the L-shaped terminal fixing parts 151, 152, 153. The grounding terminal fixing part 154 and the grounding terminal 144 are in conductive contact. Specifically, the grounding terminal 144 is in conductive contact with the grounding terminal fixing part 154 before being plastic coated.

[0052] Figure 2A is a three-dimensional diagram of the input terminal assembly 134 of the present application, Figure 2B 1 is a perspective view of each input terminal in the input terminal assembly 134 .

[0053] like Figure 2A-2B As shown, the input terminal assembly 134 includes four independent input terminals 201, 202, 203, 204 and an input terminal overmolding 206. The input terminal overmolding 206 is made of insulating material, which covers the input terminals 201, 202, 203, 204 inside, so that the four input terminals 201, 202, 203, 204 are independent and insulated from each other. Each of the four input terminals 201, 202, 203, 204 is an L-shaped structure, and each of the four input terminals 201, 202, 203, 204 has an input receiving end 221, 222, 223, 224 and a PCB board insertion end 211, 212, 213, 214. Each of the PCB board insertion ends 211, 212, 213, 214 can be inserted into a corresponding receiving hole in the four input receiving holes 122 of the PCB board 120 by interference fit.

[0054] In an embodiment of the present application, input terminal 201 and input terminal 204 of the four input terminals 201, 202, 203, 204 can be used to receive power input, for example, input terminal 201 receives a positive 13V potential input through input receiving terminal 221, and input terminal 204 receives a 0V potential input through input receiving terminal 224, so there is a 13V voltage between input terminal 201 and input terminal 204. Input terminal 203 can receive a control signal from a control device (not shown) through input receiving terminal 223, such as a control signal for the actuator 100 to output a clockwise or counterclockwise rotation torque. Input terminal 202 is a reserved terminal, and the corresponding reserved function on the PCB board can be activated according to different product requirements. Of course, those skilled in the art should know that according to different operating requirements of the actuator and different circuit designs on the PCB board, the number of input terminals, the input potential or input signal received by each input terminal can be adjusted or replaced accordingly.

[0055] Figures 3A-3E The first embodiment of the three-phase connection structure of the brushless motor in the actuator 100 is shown, wherein Figure 3A FIG. 1 is a top view of the actuator 100 , in which the actuator cover 102 and the PCB board 120 are hidden to show more components inside the actuator 100 ; Figure 3B is a three-dimensional diagram of the special-shaped L-shaped terminal 141, Figure 3C is a three-dimensional diagram of the ground terminal 144; Figure 3DIt is a schematic diagram of the special-shaped L-shaped terminals 141, 142, 143 and the ground terminal 144 cooperating with the brushless motor 140; Figure 3E It is a side view of the special-shaped L-shaped terminals 141 , 142 , 143 and the ground terminal 144 mating with the brushless motor 140 .

[0056] like Figure 3A As shown, the three L-shaped terminals 141, 142, 143 and the grounding terminal 144 are distributed at a certain interval angle in the circumferential direction of the outer shell of the stator 138. In the embodiment of the present application, the stator 138 adopts a 6-slot wire group, and the size range of the above angle is between 40° and 80°. In some other embodiments, 3 to 16 slot wire groups can also be used, so the circumferential distribution angle of the three L-shaped terminals 141, 142, 143 and the grounding terminal 144 in the outer shell of the stator 138 and the circumferential direction angle of the terminal fixing parts can be set accordingly according to the different numbers of slot wire groups.

[0057] In order to save costs and facilitate production, the three L-shaped terminals 141, 142, 143 can be manufactured by the same set of molds, so their structures are completely the same. The structure of the L-shaped terminal 141 is described below by taking it as an example.

[0058] like Figure 3B As shown, the L-shaped terminal 141 is a special-shaped L-shaped terminal 141, which has an L-shaped terminal body 312, an L-shaped terminal insertion end 314 arranged above the L-shaped terminal body 312, an L-shaped terminal bending connection section 316 arranged below the L-shaped terminal body 312, and an L-shaped terminal winding end 318 connected to the right end of the L-shaped terminal bending connection section 316. The L-shaped terminal winding end 318 is used to wind the wires led out of the conductive wire group on the stator 138 and electrically connect with them, so that the L-shaped terminal 141 can transmit the corresponding potential of the PCB board 120 to the brushless motor 140.

[0059] Specifically, the L-shaped terminal insertion end 314 extends from above the L-shaped terminal body 312 toward the first direction, and can be inserted into a corresponding receiving hole of the three output connection holes 126 of the PCB board 120 by interference fit. Figure 3B As can be seen from the figure, the L-shaped terminal insertion end 314 and the L-shaped terminal body 312 extend in the same direction.

[0060] Specifically, the L-shaped terminal bending connection section 316 has a first bending portion 315, a second bending portion 317, and a section body extension portion 319 located between the first bending portion 315 and the second bending portion 317. The first bending portion 315 is bent and extended at a certain angle from the bottom of the L-shaped terminal body 312, so that the section body extension portion 319 extends toward the second direction, and the second bending portion 317 is bent and extended again at a certain angle from one end of the section body extension portion 319 relative to the first bending portion 315 and connected to the L-shaped terminal winding end 318. The bending direction is different from the bending plane in which the first bending direction is located, so that the L-shaped terminal winding end 318 can be extended toward the third direction. Through the first bending, the L-shaped terminal body 312 and the main body extension portion 319 are extended in the first plane together; through the second bending, the L-shaped terminal winding end 318 and the main body extension portion 319 are extended in the second plane together.

[0061] In the embodiment of the present application, the first bent portion 315 is bent 90° relative to the L-shaped terminal body 312, so that the segment body extension portion 319 is perpendicular to the L-shaped terminal body 312, and the second bent portion 317 is bent 90° relative to the segment body extension portion 319, so that the L-shaped terminal winding end 318 is perpendicular to the segment body extension portion 319. At the same time, the first plane is perpendicular to the second plane, that is, the first direction, the second direction and the third direction are perpendicular to each other.

[0062] Through the above-mentioned structural setting, the L-shaped terminal winding end 318 of the L-shaped terminal extends vertically at a certain distance relative to the L-shaped terminal body 312, and the distance of the interval is roughly equal to the extension length of the section body extension part 319. Therefore, this structure of the L-shaped terminal is called a special-shaped L-shaped terminal.

[0063] like Figure 3C As shown, the ground terminal 144 is a long strip structure, which has a ground terminal body 342 , a ground terminal insertion end 344 extending upward from the ground terminal body 342 , and a ground terminal grounding end 346 extending downward from the ground terminal body 342 .

[0064] Specifically, the ground terminal insertion end 344 extends from above the ground terminal body 342 toward the first direction, and can be inserted into the ground hole 127 of the PCB board 120 by interference fit. The ground terminal ground end 346 extends from below the ground terminal body 342 toward the direction opposite to the first direction, and can be conductively connected to the metal shell outside the stator 138, so that the stator 138 is grounded and the charge on the stator 138 is released.

[0065] Figure 3D-3EA schematic diagram showing the cooperation between the special-shaped L-shaped terminals 141 , 142 , 143 and the ground terminal 144 and the brushless motor 140 is shown.

[0066] like Figure 3D As shown, the stator 138 of the brushless motor 140 has an outer shell 382 and an inner winding portion 384, and a conductive wire group is arranged inside the inner winding portion 384. The outer shell 382 is cylindrical, and the central axis of the cylinder coincides with the rotation axis of the rotor 130; the inner winding portion 384 is used to accommodate the conductive wire group. In the embodiment of the present application, 6 winding portions are evenly distributed in the circumferential direction of the stator 138. In some other embodiments, a corresponding number of winding portions can also be set according to needs.

[0067] Three L-shaped terminal fixing parts 151, 152, 153 and one ground terminal fixing part 154 are arranged at intervals of a certain angle along the circumferential direction on the outer shell 382 of the stator 138. In the embodiment of the present application, the stator 138 adopts a 6-slot wire group, and the size range of the above angle is between 40° and 80°. Four motor fixing parts 391, 392, 393, 394 are also evenly arranged along the circumferential direction on the outer shell 382 of the stator 138, which are used to fix the stator 138 of the brushless motor 140 (for example, fixed by screws) inside the actuator housing 104. In order to avoid interference with the motor fixing parts 391, 392, 393, 394 during winding, the L-shaped terminal winding ends 318, 328, 338 of the three special-shaped L-shaped terminals 141, 142, 143 need to avoid and be arranged at a certain distance from the motor fixing parts 391, 392, 393. Therefore, the L-shaped terminal winding end 318, 328, 338 of each special-shaped L-shaped terminal 141, 142, 143 and the L-shaped terminal insertion end extend at a certain distance in the circumferential direction of the outer shell 382. This is also the reason why an L-shaped terminal bending connection section with a certain extension length is provided on the special-shaped L-shaped terminals 141, 142, 143.

[0068] Each of the three L-shaped terminal fixing parts 151, 152, 153 is used to accommodate and fix a corresponding one of the three structurally identical special-shaped L-shaped terminals 141, 142, 143, so the structures of the three L-shaped terminal fixing parts 151, 152, 153 are also identical. The following takes the fixed connection between the L-shaped terminal fixing part 152 and the special-shaped L-shaped terminal 142 as an example to introduce their matching method.

[0069] Continue as Figure 3DAs shown, the L-shaped terminal fixing portion 152 has a first opening 352 facing upward in the axial direction of the outer shell 382 and a second opening 354 facing outward in the radial direction of the outer shell 382. The axial first opening 352 and the radial second opening 354 are arranged at a certain distance in the circumferential direction of the outer shell 382, ​​and the distance of the interval is the distance between the L-shaped terminal winding end 328 of the special-shaped L-shaped terminal 142 and the L-shaped terminal insertion end. The L-shaped terminal body and the L-shaped terminal bending connection section of the special-shaped L-shaped terminal 142 are accommodated in the L-shaped terminal fixing portion 152, the L-shaped terminal insertion end extends outward in the axial direction from the axial first opening 352, and the L-shaped terminal winding end 328 extends outward in the radial direction from the radial second opening 354. The part of the special-shaped L-shaped terminal 142 accommodated in the L-shaped terminal fixing portion 152 is pre-molded to maintain insulated contact with the L-shaped terminal fixing portion 152, so no conductive contact occurs between the special-shaped L-shaped terminal 142 and the outer shell 382. Similarly, the matching manner of the special-shaped L-shaped terminals 141 , 143 and the outer shell 382 is the same as the matching manner of the special-shaped L-shaped terminal 142 and the outer shell 382 , and no conductive contact will occur between the special-shaped L-shaped terminals 141 , 143 and the outer shell 382 .

[0070] Continue as Figure 3D As shown, the grounding terminal grounding end 346 of the grounding terminal 144 and a portion of the grounding terminal body 342 can be inserted into the grounding terminal fixing portion 154 and maintain conductive contact with the grounding terminal fixing portion 154, so that the grounding terminal 144 can release excess charge on the outer shell 382 to the PCB board 120.

[0071] In the embodiment of the present application, the special-shaped L-shaped terminals 141, 142, 143 and the ground terminal 144 respectively correspond to the U, V, W ports and the ground port on the PCB board 120. Two of the U, V, W ports can alternately transmit current to the brushless motor 140, so that the rotor 130 of the brushless motor 140 rotates, and the clockwise or counterclockwise rotation of the rotor 130 can be controlled by controlling the potential difference of the two of the U, V, W ports.

[0072] like Figure 3EAs shown, compared with the terminal plugged into the PCB board on the transmission brushless motor, the present application sets the special-shaped L-shaped terminal so that the winding end of the terminal is set in the radial direction of the outer shell 382 of the stator 138, rather than between the PCB board and the outer shell 382 of the stator 138. Therefore, the distance D between the PCB board 120 and the stator 138 in the present application is smaller than that in the prior art, so that the size of the actuator 100 in the height direction can be designed to be more compact. At the same time, compared with the terminal whose winding end passes through the PCB board, the PCB board 120 in the present application only needs to open three output connection holes 126 for the special-shaped L-shaped terminals 141, 142, and 143, without setting three additional air-avoiding holes on the PCB board 120 for avoiding the air-avoiding winding ends, which not only reduces the difficulty of assembling the terminal and the PCB board, but also increases the use area of ​​the PCB board 120, so that the size of the PCB board 120 can be designed to be smaller than that in the prior art, so that the size of the actuator 100 in the length and width directions can be designed to be more compact.

[0073] On the other hand, Figure 3A As shown, the L-shaped terminal winding ends 318, 328, 338 of the special-shaped L-shaped terminals 141, 142, 143 extending radially outward along the outer shell 382 of the stator 138 are designed to be arranged in the gap inside the actuator housing 104, that is, the space portion not used or occupied by other components, such as the corners of the inner wall of the actuator housing 104, or the installation gap generated by the stator 138 and the actuator housing 104 (for example, the installation gap along the length or width direction of the actuator 100), thereby increasing the utilization rate of the internal space of the actuator housing 104, eliminating the need to set additional installation space for the special-shaped L-shaped terminals 141, 142, 143, and also making the actuator 100 more compact in length and width.

[0074] Figures 4A-4D A second embodiment of the three-phase connection structure of the brushless motor in the actuator 100 is shown, wherein Figure 4A It is a three-dimensional diagram of the actuator 400 of the present application, in which the actuator cover 102 is hidden to show more components inside the actuator 400; Figure 4B It is a top view of the actuator 400 of the present application, in which the actuator cover 102 and the PCB board 420 are hidden to show more components inside the actuator 400; Figure 4C is a three-dimensional diagram of an L-shaped terminal 403; Figure 4D It is a schematic diagram of the L-shaped terminals 401 , 402 , 403 and the ground terminal 404 cooperating with the brushless motor 440 .

[0075] Figures 4A-4DThe second embodiment of the three-phase connection structure of the brushless motor shown differs from the first embodiment mainly in the different structures of the L-shaped terminal and the outer shell 482 of the stator 458, and the different circumferential arrangement of the L-shaped terminal and the ground terminal on the outer shell 482. The same parts will not be repeated.

[0076] like Figures 4A-4D As shown, in the second embodiment of the three-phase connection structure of the brushless motor, the structures of the three L-shaped terminals 401, 402, and 403 are the same. Taking the L-shaped terminal 403 as an example, it has an L-shaped terminal body 432, an L-shaped terminal insertion end 434 arranged above the L-shaped terminal body 432, an L-shaped terminal bending connection section 436 arranged below the L-shaped terminal body 432, and an L-shaped terminal winding end 438 connected to the end of the L-shaped terminal bending connection section 436. The L-shaped terminal winding end 438 is used to wind the wires led out of the conductive wire group on the stator 458, so that the L-shaped terminal 403 can transmit the corresponding potential of the PCB board 420 to the brushless motor 440.

[0077] Specifically, from Figure 4C As can be seen in the figure, the L-shaped terminal insertion end 434 extends from above the L-shaped terminal body 432 toward the first direction, and can be inserted into a corresponding receiving hole of one of the three output connection holes of the PCB board 420 by interference fit. The L-shaped terminal insertion end 434 extends in the same direction as the L-shaped terminal body 432. The L-shaped terminal bent connection section 436 allows the L-shaped terminal winding end 438 to extend at a certain angle relative to the L-shaped terminal body 432. In an embodiment of the present application, the L-shaped terminal winding end 438 extends perpendicular to the L-shaped terminal body 432, so the L-shaped terminal 403 is structurally L-shaped.

[0078] like Figure 4B and 4D As shown, three L-shaped terminals 401, 402, 403 are arranged side by side or in parallel in the circumferential direction of the outer shell 482 of the stator 458. In order to avoid interference between the winding end of the L-shaped terminal and the fixing part of the motor, in this embodiment, the motor 440 is only provided with three motor fixing parts 491, 492, 493. In order to adapt to the structure and position arrangement of the L-shaped terminals 401, 402, 403, the arrangement of the L-shaped terminal fixing part on the outer shell 482 of the motor stator is also different from the first embodiment. Taking one of the three identical L-shaped terminal fixing parts, an L-shaped terminal fixing part 452, as an example, the L-shaped terminal fixing part 452 has a first opening 462 facing upward in the axial direction of the outer shell 482 and a second opening 464 facing outward in the radial direction of the outer shell 482. The axial first opening 462 and the radial second opening 464 are arranged above in the axial direction.

[0079] Taking the L-shaped terminal 403 as an example, the L-shaped terminal body 432 and the L-shaped terminal bending connection section 436 are accommodated in the L-shaped terminal fixing portion 452, the L-shaped terminal insertion end extends upward from the first opening 462 in the axial direction, and the L-shaped terminal winding end 438 extends outward from the second opening 354 in the radial direction. The portion of the L-shaped terminal 403 accommodated in the L-shaped terminal fixing portion 452 is pre-molded to maintain insulated contact with the L-shaped terminal fixing portion 452, so there will be no conductive contact between the L-shaped terminal 403 and the outer shell 482. Similarly, the matching method of the L-shaped terminals 401, 402 and the outer shell 482 is the same as the matching method of the L-shaped terminal 403 and the outer shell 482, and there will be no conductive contact between the outer shell 482. The grounding terminal 404 is inserted into the grounding terminal fixing portion of the outer shell 482 and maintains conductive contact with the grounding terminal fixing portion, so the grounding terminal 404 can release the excess charge on the PCB board 420 to the outer shell 482.

[0080] like Figure 4B As shown, three L-shaped terminals 401, 402, 403 are distributed across a certain angle range in the circumferential direction of the outer shell 482 of the stator 458. In the embodiment of the present application, the stator 438 adopts a 6-slot wire group, and the angle range of the L-shaped terminal 401 and the L-shaped terminal 403 in the circumferential direction of the outer shell 482 of the stator 458 is between 20° and 80°. In some other embodiments, 3 to 16 slot wire groups can also be used, and the above angle range can be set accordingly according to the different number of slot wire groups.

[0081] Continue as Figure 4B As shown, the winding ends of the three L-shaped terminals 401, 402, and 403 extending radially outward along the outer shell 482 of the stator 458 are designed to be arranged side by side or in parallel in the gap inside the actuator housing 104, that is, the space portion not used or occupied by other components, such as the corners of the inner wall of the actuator housing 104, or the installation gap generated by the stator 458 and the actuator housing 104 (for example, the installation gap along the length or width direction of the actuator 100), thereby increasing the utilization rate of the internal space of the actuator housing 104, eliminating the need to set additional installation space for the winding ends of the L-shaped terminals, and making the actuator 400 more compact in length and width.

[0082] Furthermore, in the embodiments of the present application, since the L-shaped terminals 401, 402, 403 are arranged side by side or in parallel on the outer shell 482 of the stator 458, the distribution of the L-shaped terminals 401, 402, 403 on the PCB board 420 is more concentrated, so the effective utilization rate of the PCB board is further improved, and the plug-in part between the L-shaped terminals and the PCB board will not divide the PCB board into small pieces, which is conducive to the arrangement of larger components on the PCB board. Therefore, the size of the PCB board can be further reduced, so that the actuator 400 is more compact in length and width.

[0083] Figures 5A-5C It is a schematic diagram of each insertion terminal having a rounded insertion end in the present application and a schematic diagram of the interference fit between the insertion end and the PCB board.

[0084] like Figures 5A-5C As shown, in the embodiment of the present application, the insertion terminals that are interference-fitted with the PCB board include input terminals 201, 202, 203, 204, insertion ends 141, 142, 143, 401, 402, 403 of the L-shaped terminals, and grounding terminals 144, 404. The contact portions of the above-mentioned insertion terminals that are interference-fitted with the inner edges 510 of the plug-in holes (e.g., four input receiving holes 122, three output connection holes 126, and one grounding hole 127) of the PCB board are provided with fillets 501, 502, 503, 504. In the embodiment of the present application, the radius R2 of the inner edge 510 of the plug-in hole of the PCB board is 0.5 mm, and the radius R1 of the fillets 501, 502, 503, 504 of the insertion terminals is 0.6 mm. When the fillet portion of the insertion terminal is inserted into the inner edge of the plug-in hole of the PCB board, the stress applied by the insertion terminal to the plug-in hole of the PCB board is evenly distributed along the arc surface of the fillet.

[0085] Compared with plug-in terminals without rounded corners (i.e., the cross-section of the plug-in terminals is close to a rectangle), the plug-in terminals with rounded corners have a larger force-bearing area with the plug-in holes of the PCB board (i.e., they contact in the form of an arc surface), and are therefore less likely to cause stress concentration in the plug-in holes, thereby avoiding assembly failures such as skewness, crushing, and collapse of the plug-in terminals, and will not easily cause failure of the plug-in holes of the PCB board and damage components on the PCB board.

[0086] The cover assembly of the present application has the following beneficial technical effects compared with the prior art:

[0087] First, compared with the terminals on the transmission brushless motor that are plugged into the PCB board, the present application sets an L-shaped terminal so that the winding end of the terminal is set in the radial direction of the outer shell of the brushless motor, rather than between the PCB board and the outer shell of the brushless motor. Therefore, the arrangement distance between the PCB board and the brushless motor in the present application is smaller than that in the prior art, thereby making the actuator more compact in height.

[0088] Second, compared to the terminal whose winding end passes through the PCB board, in the present application, only three matching holes need to be set on the PCB board for the L-shaped terminal, without setting three additional air-avoiding holes on the PCB board for avoiding the air-avoiding winding end. This not only reduces the difficulty of assembling the terminal and the PCB board, but also increases the use area of ​​the PCB board, so that the size of the PCB board can be designed smaller than that of the prior art, thereby making the actuator more compact in length and width.

[0089] Third, the winding ends of the L-shaped terminals of the present application extending radially outward along the outer shell of the motor are distributed in the inner gap of the actuator shell, that is, distributed in the space that is not used or occupied by other parts of the actuator shell, such as the corners of the inner wall of the actuator shell, or the gaps generated by the installation of the motor and the actuator shell (such as the installation gap along the length or width direction of the actuator), thereby increasing the utilization rate of the internal space of the actuator shell, eliminating the need to set up additional installation space for the L-shaped terminals, and making the actuator more compact in length and width.

[0090] Fourth, in the second embodiment of the present application, since the L-shaped terminals are arranged side by side or in parallel on the outer housing of the motor, the distribution of the L-shaped terminals on the PCB board is more concentrated, so the effective utilization rate of the PCB board is further improved, and the plug-in part between the L-shaped terminals and the PCB board will not divide the PCB board into small pieces, which is conducive to the arrangement of larger components on the PCB board. Therefore, the size of the PCB board can be further reduced, so that the actuator is more compact in length and width.

[0091] Fifth, the special design of the winding end extending outward from the L-shaped terminal in the present application makes the winding of the enameled wire and the winding end of the L-shaped terminal more convenient, and can easily realize mechanized and efficient production, reduce the difficulty of winding, improve production efficiency, and reduce production costs.

[0092] Sixth, since the soldering process is required after winding, the enameled wire coil is solidified on the winding end. The special design of the winding end extending outward from the L-shaped terminal can be soldered, which can reduce the difficulty of the production process, make the production process stable, improve production efficiency, and reduce the investment in fixed assets (otherwise, only a robot can be used for spot welding, or manual welding).

[0093] Seventh, the special design of the winding end of the L-shaped terminal extending outward allows the stator to adopt all processes of mechanized production, improve production efficiency, improve production quality stability, improve production reliability, and reduce production costs.

[0094] Eighth, the part where the plug-in terminal and the PCB board have an interference fit adopts a rounded corner design, which increases the contact area between the plug-in terminal and the PCB board, so that the plug-in terminal is evenly stressed during the assembly process with the PCB board, and is not prone to stress concentration, thereby avoiding assembly failures such as skewness, crushing, and collapse of the plug-in terminal, and will not cause failure of the matching inner hole of the plug-in terminal and the PCB board, and damage the components on the PCB board. This rounded corner design is conducive to increasing the contact area between the plug-in terminal and the PCB board, increasing the conduction of current, and will not cause excessive resistance, let alone abnormal heating in the contact area.

[0095] Although the present application has been described in conjunction with the examples of the embodiments summarized above, it is obvious to those of ordinary skill in the art that various alternatives, modifications, changes, improvements and / or substantially equivalent solutions, whether known or currently or foreseeable in the near future, may be apparent. In addition, the technical effects and / or technical problems described in the present application are exemplary rather than restrictive; so the disclosure in the present application may be used to solve other technical problems and have other technical effects and / or may solve other technical problems. Therefore, the examples of the embodiments of the present application as stated above are intended to be illustrative rather than restrictive. Various changes may be made without departing from the spirit or scope of the present application. Therefore, the present application is intended to include all known or earlier developed alternatives, modifications, changes, improvements and / or substantially equivalent solutions.

Claims

1. A three-phase connection structure for a brushless motor (140, 440), characterized in that include: A stator (138, 458) of the brushless motor (140, 440), wherein a conductive wire group is disposed on the stator (138, 458); A plurality of connection terminals, the plurality of connection terminals are distributed in the circumferential direction of the stator (138, 458), wherein each of the plurality of connection terminals comprises: A circuit board plug-in end, the circuit board plug-in end being configured to be inserted into a circuit board (120, 420) so as to maintain electrical connection with the circuit board (120, 420); a winding end configured to be electrically connected to the conductive wire set; and A fixed end, the fixed end is arranged between the circuit board plug-in end and the winding end, and is configured to fixedly connect each of the plurality of connection terminals to the stator (138, 458), Wherein, the circuit board plug-in end and the winding end extend in different directions at a certain angle to each other.

2. The three-phase connection structure according to claim 1, characterized in that: The circuit board plug-in end extends upward in the axial direction of the stator (138, 458), and the winding end extends outward in the radial direction of the stator (138, 458).

3. The three-phase connection structure according to claim 2, characterized in that: The stator (138, 458) has a plurality of terminal fixing parts, each of the plurality of terminal fixing parts is configured to accommodate the fixed end of each of the plurality of connecting terminals, and the portion of each of the plurality of connecting terminals that contacts each of the plurality of terminal fixing parts is treated by overmolding so that each of the plurality of connecting terminals maintains insulated contact with the stator (138, 458).

4. The three-phase connection structure according to claim 3, characterized in that: The circuit board (120, 420) is disposed above the stator (138, 458) in the axial direction, and the circuit board (120, 420) and the stator (138, 458) are compactly arranged in the axial direction.

5. The three-phase connection structure according to claim 4, characterized in that: The plurality of connection terminals are three connection terminals, and the plurality of terminal fixing portions are three terminal fixing portions.

6. The three-phase connection structure according to claim 5, characterized in that: Each of the three connecting terminals is an irregular L-shaped terminal, and the fixed end of the irregular L-shaped terminal has a first bent portion (315), a second bent portion (317), and a fixed end extension portion (319) arranged between the first bent portion (315) and the second bent portion (317). The first bent portion (315) is bent and extended at a first angle from below the circuit board plug-in end, the second bent portion (317) is bent and extended at a second angle from one end of the fixed end extension portion (319) relative to the first bent portion (315) and is connected to the winding end, and the fixed end extension portion (319) extends in an extension direction different from the extension direction of the circuit board plug-in end and the winding end.

7. The three-phase connection structure according to claim 6, characterized in that: The fixed end extension portion (319) extends in a third direction different from the axial direction and the radial direction, the third direction is perpendicular to the axial direction and the third direction is perpendicular to the radial direction, Each of the three or more terminal fixing portions has an axial opening (352) and a radial opening (354), and the axial opening (352) and the radial opening (354) are arranged at a certain distance in the circumferential direction of the stator (138). The circuit board plug-in end of the special-shaped L-shaped terminal extends upward from the axial opening (352) along the axial direction, and the winding end of the special-shaped L-shaped terminal extends outward from the radial opening (354) along the radial direction.

8. The three-phase connection structure according to claim 7, characterized in that: The three connection terminals are distributed at certain angles in the circumferential direction of the outer shell of the stator (138).

9. The three-phase connection structure according to claim 5, characterized in that: Each of the three connecting terminals is an L-shaped terminal, and the fixed end of the L-shaped terminal is L-shaped, so that the circuit board plug-in end and the winding end of the L-shaped terminal extend in different directions at a certain angle to each other.

10. The three-phase connection structure according to claim 9, characterized in that: Each of the three terminal fixing portions has an axial opening (462) and a radial opening (464), wherein the axial opening (462) is arranged above the radial opening (464) along the axial direction. The circuit board plug-in end of the L-shaped terminal extends upward from the axial opening (462) along the axial direction, and the winding end of the L-shaped terminal extends outward from the radial opening (464) along the radial direction.

11. The three-phase connection structure according to claim 10, characterized in that: The three connection terminals are arranged side by side or in parallel in the circumferential direction of the outer shell of the stator (458).

12. The three-phase connection structure according to claim 1, characterized in that Also includes: A grounding terminal (144, 404), one end of which can be inserted into a circuit board (120, 420) to maintain electrical connection with the circuit board (120, 420), and the other end of which can be inserted into the stator (138, 458) to maintain electrical connection with the stator (138, 458). The ground terminal (144, 404) is configured to maintain electrical connection between the circuit board (120, 420) and the stator (138, 458) of the brushless motor (140, 440).

13. The three-phase connection structure according to claim 12, characterized in that: The circuit board (120, 420) is provided with a plurality of jacks corresponding to the number of the plurality of connection terminals and the grounding terminals (144, 404), and the plurality of connection terminals and the grounding terminals (144, 404) are electrically connected to the plurality of jacks by means of interference fit.

14. The three-phase connection structure according to claim 13, characterized in that: The multiple connection terminals and the grounding terminals (144, 404) are provided with rounded corners at the interference fit contact portions with the multiple plug holes, thereby avoiding stress concentration when the multiple connection terminals and the grounding terminals (144, 404) are plugged into the multiple plug holes.

15. The three-phase connection structure according to claim 1, characterized in that: The brushless motor (140, 440) includes the stator (138, 458), the stator (138, 458) is arranged outside the brushless motor (140, 440), and The brushless motor (140, 440) further comprises a rotor (130) arranged inside the stator (138, 458), wherein a rotation axis of the rotor (130) coincides with a central axis of the stator (138, 458). When the conductive wire group is energized, the rotor (130) is configured to rotate along the rotation axis in a clockwise direction or a counterclockwise direction.

16. The three-phase connection structure according to claim 2, characterized in that: The brushless motor (140, 440) and the circuit board (120, 420) are arranged inside the actuator (100, 400), and The winding ends of the plurality of connection terminals extending outward in the radial direction are distributed at the installation gap between the brushless motor (140, 440) and the inner wall of the actuator (100, 400) housing, or the winding ends of the plurality of connection terminals extending outward in the radial direction are distributed at the corners of the inner wall of the actuator (100, 400) housing, thereby increasing the utilization rate of the internal space of the actuator (100, 400).

17. An actuator (100, 400), characterized in that Comprising the three-phase connection structure according to any one of claims 2 to 18, the actuator (100, 400) further comprises: Actuator housing; A rotor (130) of the brushless motor (140, 440), wherein the stator (138, 458) of the brushless motor (140, 440) is arranged outside the brushless motor (140, 440), and the rotor (130) is arranged inside the stator (138, 458), and the rotation axis of the rotor (130) coincides with the central axis of the stator (138, 458); and A circuit board (120, 420), wherein the circuit board (120, 420) is arranged above the brushless motor (140, 440) in an axial direction. The brushless motor (140, 440) and the circuit board (120, 420) are arranged inside the actuator housing, and the winding ends of the multiple connection terminals extending outward in the radial direction are distributed at the installation gap between the brushless motor (140, 440) and the inner wall of the actuator housing, or the winding ends of the multiple connection terminals extending outward in the radial direction are distributed at the corners of the inner wall of the actuator housing, thereby increasing the utilization rate of the internal space of the actuator (100, 400).

18. The actuator according to claim 17, characterized in that Also includes: A transmission assembly (118) is arranged inside the actuator housing, and the transmission assembly (118) is configured to cooperate with the rotor (130) so as to output the rotational torque of the rotor (130) to an external structure.

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