Anti-interference seat adjusting motor and automobile seat

Abstract

The application discloses an anti-interference seat adjusting motor and an automobile seat. The anti-interference seat adjusting motor comprises a rotor, two second power supply terminals for connecting an external power supply, and an EMC circuit. The EMC circuit is composed of an LC filter and a surge protection component in parallel and is electrically connected between the two second power supply terminals. The LC filter effectively suppresses high-frequency conducted interference generated by motor brush commutation, improving electromagnetic compatibility. The surge protection component can absorb transient overvoltage of the power supply system, enhancing the reliability and durability of the motor in a complex electrical environment. The application solves the problems of electromagnetic interference and surge impact from the source, guarantees the stability of motor torque output and the accuracy of seat adjustment, and significantly improves the comprehensive competitiveness of the product.

Description

Technical Field

[0001] This application relates to the field of automotive parts, and in particular to an interference-resistant seat adjustment motor and an automotive seat. Background Technology

[0002] Car seat adjustment motors are indispensable actuators in modern automobiles, responsible for driving the seats to perform various functions such as fore-and-aft movement, backrest angle adjustment, and height adjustment. With the continuous improvement of automotive intelligence and comfort, the number of motors installed on a single seat is increasing, placing higher demands on the reliability, smoothness, and quietness of motor operation.

[0003] However, seat adjustment motors typically use permanent magnet DC motors, which generate broadband electromagnetic interference (EMI) during operation, especially when the brushes and commutator are constantly switching on and off. This interference can be conducted through the power lines to the vehicle's electrical system, severely affecting the normal operation of sensitive electronic devices such as the car radio, sensors, and control units. Furthermore, the automotive electrical environment is inherently complex, posing threats from various transient overvoltages (surges) from the ignition system, load drops, and other sources. These external interferences can easily penetrate the motor through the power lines, potentially damaging its control circuitry, leading to motor failure, and directly impacting the reliability and safety of the seat function. Utility Model Content

[0004] This application provides an anti-interference seat adjustment motor and automotive seat, which aims to solve the problems of electromagnetic interference caused by brush commutation affecting the vehicle's electrical system and internal circuit damage and poor reliability caused by power surge impact. By building a built-in integrated EMC circuit, electromagnetic compatibility and operational stability are improved from the source.

[0005] To solve the above-mentioned technical problems, the technical solution adopted in this application is: The first aspect of this application discloses an interference-resistant seat adjustment motor, comprising: Rotor; Two second power terminals are connected to the positive and negative terminals of an external power source, respectively, to supply power to the rotor; The EMC circuit includes an LC filter and surge protection components. The LC filter is electrically connected to two second power supply terminals, and the surge protection components are connected in parallel to the two second power supply terminals.

[0006] In some embodiments, the surge protection component is a TVS diode, a TSS diode, or a series combination of a resettable fuse and a TVS diode.

[0007] In some embodiments, the LC filter includes a capacitor and two inductors; the capacitor is connected in parallel to the two second power supply terminals; and the two inductors are connected in series to the positive and negative terminals of the external power supply, respectively.

[0008] In some embodiments, the capacitor includes a first filter capacitor and a second filter capacitor. The first filter capacitor and the second filter capacitor are connected in series to form a series capacitor group, and the series capacitor group is connected in parallel to two second power supply terminals.

[0009] In some embodiments, the capacitor includes a third filter capacitor connected in parallel to the two second power supply terminals.

[0010] In some embodiments, the EMC circuit further includes a thermistor connected in series between the external power supply and the rotor.

[0011] In some embodiments, the interference-resistant seat adjustment motor further includes two first power terminals, which are respectively connected to the positive and negative terminals of an external power source, and a Hall circuit electrically connected to the two first power terminals. The Hall circuit has an RC low-pass filter and a Hall IC element, and the RC low-pass filter is electrically connected to the Hall IC element.

[0012] In some embodiments, the connection node between the first filter capacitor and the second filter capacitor is electrically connected to the Hall IC element.

[0013] In some embodiments, the Hall IC element has a positive pin, a negative pin, and a signal output pin, the positive pin and the negative pin being electrically connected to two first power supply terminals respectively; the RC low-pass filter has a resistor and a fourth capacitor, one end of the resistor being electrically connected to one of the first power supply terminals and the other end being electrically connected to the signal output pin of the Hall IC element, the fourth capacitor being connected in parallel to the two first power supply terminals and grounded.

[0014] The second aspect of this application discloses an automobile seat, including an interference-resistant seat adjustment motor as described in any of the preceding embodiments.

[0015] The beneficial effects of this application are as follows: The anti-interference seat adjustment motor provided in this application solves two core problems of traditional motors from the source by incorporating an integrated EMC circuit: First, the LC filter effectively suppresses high-frequency conducted interference generated during motor brush commutation, preventing it from leaking through the power line and affecting other electronic devices in the vehicle, thereby significantly improving electromagnetic compatibility performance; Second, surge protection components can quickly absorb instantaneous overvoltage impacts from the automotive power system, providing critical protection for the internal circuitry and greatly enhancing the reliability and durability of the motor in complex electrical environments; Ultimately, this ensures the smoothness of the motor's output torque and the precise reliability of the seat adjustment function, comprehensively improving the product's competitiveness. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the seat adjustment motor provided in some embodiments of this application; Figure 2 This is a cross-sectional structural schematic diagram of the seat adjustment motor provided in some embodiments of this application; Figure 3 This is a schematic diagram of the internal structure of the seat adjustment motor provided in some embodiments of this application; Figure 4 These are schematic diagrams of the carbon brush holder, electrical components, and commutator provided in some embodiments of this application; Figure 5 This is an exploded structural diagram of the carbon brush holder, electrical components, and commutator provided in some embodiments of this application; Figure 6 This is a schematic diagram of the commutator structure provided in some embodiments of this application; Figure 7 This is a schematic diagram of the structure of the bearing clip provided in some embodiments of this application; Figure 8 This is a schematic diagram of the end cap structure provided in some embodiments of this application; Figure 9 This is a circuit connection diagram of the seat adjustment motor provided in some embodiments of this application.

[0018] Explanation of reference numerals in the attached figures: 1000-Seat adjustment motor, 100-Housing assembly, 110-Carbon brush bracket, 111-Power socket, 112-Inductor housing cavity, 1121-First opening, 1122-Second opening, 113-Thermistor housing cavity, 114-Snap-fit ​​part, 115-Grounding wire housing cavity, 116-Positioning part, 117-Void cavity, 118-Support part, 119-Positioning post, 120-Stator cylinder, 130-End cover, 131-Spherical positioning Cavity, 132-Bearing clamp mounting cavity, 1321-Longitudinal annular surface, 1322-Axial cylindrical surface, 200-First power terminal, 300-Second power terminal, 310-First connecting end, 320-Second connecting end, 330-Third connecting end, 410-Shaft, 420-Rotor, 421-Laminated iron core, 422-Winding, 430-Magnetic tile, 440-Annular bearing, 450-Bearing clamp, 451-Annular base plate, 452-Flanged portion 453-Claw plate, 460-Spherical bearing, 470-Friction pad, 480-Elastic pad, 490-Positioning ring, 500-Circuit board, 550-Positioning hole, 610-Thermistor, 620-Inductor, 621-Coil, 6211-First terminal block, 6212-Second terminal block, 630-Surge protection element, 641-First filter capacitor, 642-Second filter capacitor, 643-Third filter capacitor, 710-RC low-pass filter 711 - Resistor, 712 - Fourth capacitor, 720 - Hall effect IC element, 721 - Positive pin, 722 - Negative pin, 723 - Signal output pin, 800 - Commutator, 810 - Base, 811 - Groove, 812 - Limiting part, 820 - Commutator segment, 821 - Commutator segment substrate, 822 - Hook part, 8221 - Folding section, 8222 - Extension section, 910 - Carbon brush, 920 - Enameled wire, 930 - Grounding wire. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are only for explaining this application and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, not all structures. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0020] In the description of this application, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0021] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] This application provides a car seat and its seat adjustment motor, the seat adjustment motor being used to adjust the horizontal or vertical position of the car seat.

[0023] See Figures 1 to 9 The seat adjustment motor includes: The housing assembly 100 includes a carbon brush holder 110 and a stator cylinder 120. The carbon brush holder 110 is provided with two first power terminals 200 and two second power terminals 300. The housing assembly 100 is provided with a rotating shaft 410, a laminated iron core 421, a winding 422 and multiple magnets 430. The rotating shaft 410, the laminated iron core 421 and the winding 422 are combined to form the rotor 420 of the motor. The laminated iron core 421 is fitted on the rotating shaft 410. The winding 422 is located on the radial outer side of the laminated iron core 421. Multiple magnets 430 are evenly distributed on the outer periphery of the winding 422 and fixed to the inner wall of the stator cylinder 120. Circuit board 500 is fixedly mounted inside housing assembly 100 and arranged on one side near carbon brush holder 110; circuit board 500 has a first surface and a second surface arranged opposite to each other. EMC circuit, the EMC circuit portion is integrated on the first surface; the EMC circuit includes a thermistor 610 and an inductor 620, the thermistor 610 and the inductor 620 are disposed on the carbon brush holder 110. Hall circuit, the Hall circuit is integrated on the second surface; The two first power terminals 200 are electrically connected to the Hall circuit, and the two second power terminals 300 are electrically connected to the EMC circuit.

[0024] Compared with existing technologies, this application efficiently frees up space originally occupied by electronic components through highly integrated circuit design and structural arrangement of components. Without changing the dimensions of the housing assembly 100 (especially the axial dimension), the freed space can be used to increase the axial length of the laminated iron core 421, winding 422 and magnet 430, thereby significantly improving the output power and torque of the motor.

[0025] Specifically, this application employs the following innovative designs to achieve space optimization and performance improvement: First, the EMC circuit and Hall circuit are integrated on both sides of the same circuit board 500, compressing electronic components that traditionally require flat placement or independent installation onto the dual planes of a single circuit board 500, significantly saving space in the direction of the rotating shaft 410 and radial direction, thus achieving a high degree of circuit integration; Second, for larger components such as thermistors 610 and inductors 620 in the EMC circuit, a design method of directly mounting them onto the carbon brush holder 110 is adopted, which not only frees up the layout area on the circuit board 500, but also makes full use of the structural space around the carbon brush holder 110 that was originally not utilized, avoiding the problem of adding extra dimensions in the direction of the rotating shaft 410 or radial direction to accommodate such components. Through the above dual space optimization design, while keeping the dimensions of the housing assembly 100 (especially the axial dimension) unchanged, the effective space successfully released can be used entirely to extend the axial length of the laminated iron core 421, winding 422, and magnet 430, ultimately achieving an effective improvement in motor output power and torque.

[0026] It should be noted that EMC (Electro Magnetic Compatibility) refers to electromagnetic compatibility.

[0027] It should be noted that extending the axial length of the laminated iron core 421, winding 422, and magnet 430 essentially improves electromagnetic coupling efficiency by increasing the effective operating parameters of the core electromagnetic components (such as the number of winding turns, magnetic flux, and effective winding length), allowing the input electrical energy to be converted into mechanical torque more efficiently. This is a classic and effective path for improving power density in motor design.

[0028] In this embodiment, the length of the housing assembly is 90-110 mm, the length of the laminated iron core is 36-46 mm, and the length of the magnetic tile is 43-53 mm, with the magnetic tile being longer than the laminated iron core. After reducing the space occupied by the electronic modules (EMC circuit and Hall circuit), the axial dimensions of the laminated iron core 421 and the magnetic tile 430 can be selected according to the different lengths of the housing assembly to achieve efficient utilization of the freed space.

[0029] The length of the outer casing assembly can be 90mm, 91mm, 92mm, 93mm, 94mm, 95mm, 96mm, 97mm, 98mm, 99mm, 100mm, 101mm, 102mm, 103mm, 104mm, 105mm, 106mm, 107mm, 108mm, 109mm, 110mm, etc.; the length of the laminated iron core can be 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, etc.; and the length of the magnetic tile can be 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, etc.

[0030] Optionally, the length of the housing assembly is 100 mm, the length of the laminated iron core 421 is 41 mm, and the length of the magnet 430 is 48 mm. This size combination is a collaborative design under the strict space constraints of the housing assembly. After the compact layout of the electronic modules frees up axial space, this size combination both approaches the assembly limit and avoids interference.

[0031] Optionally, the length of the housing assembly is 100 mm, the length of the laminated iron core 421 is 41 mm, and the length of the magnet 430 is 48 mm. This size combination is a collaborative design under the strict space constraints of the housing assembly. After the compact layout of the electronic modules frees up axial space, this size combination both approaches the assembly limit and avoids interference.

[0032] In this embodiment, the carbon brush holder 110 is an injection-molded part, and the second power terminal 300 and the first power terminal 200 are both metal plates and integrally injection-molded with the carbon brush holder 110. Integrating the carbon brush holder 110 and the four power terminals into a single unit through injection molding forms a complete component. The relative positions of the first and second power terminals remain fixed, effectively preventing loosening due to vibration and ensuring the long-term stability and conductivity reliability of the power input path. Simultaneously, the integral injection molding structure allows most of the space occupied by the first power terminal 200 and the second power terminal 300 to overlap with the carbon brush holder 110, eliminating the need for additional mechanical fasteners (such as screws or clips). This further reduces the overall space occupied by the carbon brush holder 110 and the power terminals, thus allowing more space for axial length extension of electromagnetic components such as the laminated iron core 421 and the winding 422, in conjunction with a highly integrated circuit layout.

[0033] See Figures 3 to 5In this embodiment, the carbon brush holder 110 has a power socket 111, and the first power terminal 200 and the second power terminal 300 extend to the power socket 111. The carbon brush holder 110 integrates the power socket 111, and the first and second power terminals extend directly into the unified power socket 111, which allows the external power supply harness to be integrated into a single plug for quick docking with the power socket 111. This simplifies the connection between the motor and the external environment by requiring only one plug, thus simplifying the assembly and connection of the circuit.

[0034] See Figures 3 to 5 The circuit board 500 has two first interfaces, which serve as the positive and negative power supply connection ports for the Hall circuit, respectively. Two first power terminals 200 are connected to the two first interfaces. By connecting the two first power terminals 200 to the positive and negative power supply connection ports of the Hall circuit one-to-one, directional matching of the power supply to the Hall circuit is achieved.

[0035] See Figures 3 to 5 The circuit board 500 has two second interfaces, which serve as the positive and negative power supply connections for the EMC circuit, respectively. Two second power terminals 300 are connected to the two second interfaces. By connecting the two second power terminals 300 to the positive and negative power supply connections of the EMC circuit one-to-one, directional matching of the power supply to the EMC circuit is achieved.

[0036] See Figures 3 to 5 Compared to the design where the first and second power terminals are distributed on opposite sides of the circuit board 500, requiring space to be reserved on each side, in this application, the first power terminal 200 and the second power terminal 300 are both connected to the circuit board 500 from the same side. The unified wiring direction can save space and reduce the probability of missed or incorrect connections due to complicated operation.

[0037] See Figures 3 to 5The second power terminal 300 is a metal plate with an integrally formed first connection terminal 310, second connection terminal 320, and third connection terminal 330. The first connection terminal 310 is electrically connected to an external power source, the second connection terminal 320 is electrically connected to the EMC circuit in the circuit board 500, and the third connection terminal 330 is electrically connected to the thermistor 610 or inductor 620. The first connection terminal 310 serves as the main inlet, receiving external power; the second connection terminal 320 serves as the outlet, directly supplying current to the EMC circuit on the circuit board 500; and the third connection terminal 330 serves as the outlet, supplying current to the thermistor 610 or inductor 620. The second power terminal 300 achieves simultaneous electrical connection with the external power source, the EMC circuit on the circuit board 500, and the thermistor 610 / inductor 620 through the integrally formed first, second, and third connection terminals, eliminating the need for additional wires or adapters and simplifying internal wiring. The three connection ends are integrally formed from metal sheets through processes such as bending and 3D printing, forming a continuous conductive path. This avoids the risk of detachment caused by welding and the use of screws and nuts for fixing, and has the outstanding advantages of low connection impedance and high reliability.

[0038] See Figure 5 The carbon brush holder 110 has an inductor housing cavity 112, in which the inductor 620 is mounted. The carbon brush holder 110 integrates the inductor housing cavity 112, providing dedicated installation space for the inductor 620, allowing the inductor 620 to be quickly and accurately positioned during assembly; the inductor housing cavity 112 also surrounds and protects the inductor 620 from all sides, effectively resisting vibration and shock, and improving its reliability under harsh working conditions.

[0039] Furthermore, the inductor housing cavity 112 has a first opening 1121 and a second opening 1122; the inductor 620 has a coil 621, which has a first connecting segment 6211 and a second connecting segment 6212. The first connecting segment 6211 passes through the first opening 1121, and the second connecting segment 6212 passes through the second opening 1122. First, the first opening 1121 and the second opening 1122 provide clear installation guides and locking points for the two connecting segments of the coil 621, ensuring that the inductor 620 can be accurately placed in a preset position, preventing it from shaking or shifting within the cavity. Second, the first and second openings of the inductor housing cavity 112 provide dedicated channels for the first and second connecting segments of the coil 621, allowing the first and second connecting segments to extend precisely along a preset path to other components (such as the carbon brush 910, thermistor 610, and second power terminal 300), achieving electrical connection with other components.

[0040] Furthermore, the first opening 1121 and / or the second opening 1122 extend axially along the inductor housing cavity 112, with the axial length of the first opening 1121 and / or the axial length of the second opening 1122 being greater than the axial length of the coil 621. Designing the first and second openings to extend axially, and with a length greater than the axial length of the coil 621 body, provides a smooth axial sliding path for mounting the inductor 620. During operation, the first and second terminals of the inductor coil 621 can be aligned with the first opening 1121 and / or the second opening 1122, and then the entire inductor 620 can be pushed into the bottom of the inductor housing cavity 112 along the cavity.

[0041] See Figure 4 and Figure 5 The carbon brush holder 110 has a thermistor housing cavity 113; the thermistor 610 is mounted in the thermistor housing cavity 113. The carbon brush holder 110 integrates the thermistor housing cavity 113, providing dedicated installation space for the thermistor 610, allowing the thermistor 610 to be quickly and accurately positioned during assembly; the thermistor housing cavity 113 can also wrap and protect the thermistor 610 from all sides, effectively resisting vibration and shock, and improving its reliability under harsh working conditions.

[0042] Furthermore, a latching portion 114 extends outward from the head of the thermistor accommodating cavity 113, which engages with the thermistor 610. After the thermistor 610 is pressed into the thermistor accommodating cavity 113, the latching portion 114 at the head of the thermistor accommodating cavity 113 undergoes elastic deformation and then springs back to lock. This process achieves mechanical limiting and self-locking fixation of the thermistor 610, thus resisting vibration without the need for additional fasteners and ensuring the stability of its long-term connection.

[0043] In this embodiment, the stator cylinder 120 is made of conductive metal and is grounded. The stator cylinder 120 is connected to the carbon brush holder 110. The carbon brush holder 110 also has a grounding wire receiving cavity 115, which is located at the edge of the carbon brush holder 110 and is open on the side closest to the stator cylinder 120. The seat adjustment motor also has a grounding wire 930, which is electrically connected to the circuit board 500 and is at least partially located in the grounding wire receiving cavity 115, abutting against the stator cylinder 120. The stator cylinder 120 is made of conductive metal, and the grounding wire can directly abut against the stator cylinder 120 through the grounding wire receiving cavity 115 to form a reliable ground. Furthermore, the grounding wire receiving cavity 115 makes full use of the unused space of the carbon brush holder 110 and does not affect the axial length optimization of core components such as the laminated iron core 421 and the coil 621. Furthermore, the stator sleeve 120 can serve as a shield and discharge channel for electromagnetic interference inside the motor, quickly transmitting electromagnetic noise generated by the wear of winding 422 and carbon brush 910 to the grounding terminal, while resisting the intrusion of external electromagnetic interference. In conjunction with the EMC circuit, it can further improve the electromagnetic compatibility of the motor, avoid interference with sensitive modules such as Hall circuits, and ensure the stability of motor operation.

[0044] See Figure 4 and Figure 5 The carbon brush holder 110 has a positioning part 116 and a cavity 117 on the side facing the circuit board 500. The positioning part 116 is located around the cavity 117, and the circuit board 500 abuts against the positioning part 116. The EMC circuit or Hall circuit on the circuit board 500 is located within the cavity 117. The positioning part 116 provides axial mounting support for the circuit board 500 by physically limiting its abutment against it. Combined with the fixed connection (such as soldering or plugging) between the first and second power terminals and the circuit board 500, the positioning and installation of the circuit board 500 are achieved, ensuring the accurate installation position of the circuit board 500 on the carbon brush holder 110. The cavity 117 provides independent housing space for the EMC circuit or Hall circuit on the circuit board 500, avoiding squeezing and wear caused by direct contact between the circuit components and the carbon brush holder 110 during the assembly of the circuit board 500. The positioning part 116 is located around the cavity 117, forming a surrounding limiting structure, which makes the circuit board 500 fit more tightly and the carbon brush holder 110 more evenly. By using the structure of the carbon brush holder 110 itself to form the positioning part 116 and the cavity 117, there is no need to add other parts and occupy the internal space of the motor. This allows the circuit board 500 to fit tightly against the carbon brush holder 110, further freeing up more axial space. Under the premise that the axial length of the housing assembly 100 remains unchanged, the axial length of core electromagnetic components such as the laminated iron core 421 and the coil 621 is effectively extended.

[0045] Furthermore, the carbon brush holder 110 also has a support portion 118, which is located within the cavity 117. The support portion 118 extends from the cavity 117 toward the circuit board 500 and abuts against the circuit board 500. The support portion 118 forms distributed support points for the circuit board 500 within the cavity 117, and together with the peripheral positioning portion 116, forms a dual positioning structure of peripheral limiting and internal support, preventing the circuit board 500 from deforming due to vibration.

[0046] Furthermore, the circuit board 500 has positioning holes 550; the carbon brush holder 110 has positioning posts 119, which are inserted into the positioning holes 550. The insertion and engagement of the positioning posts 119 and the positioning holes 550 provides a clear assembly reference for the circuit board 500. Combined with the connection and engagement of the first and second power terminals with the circuit board 500, the pre-positioning and placement of the circuit board 500 can be completed quickly, eliminating the need for repeated manual alignment during assembly.

[0047] See Figure 2 and Figure 3 The seat adjustment motor also includes: Annular bearing 440, which is mounted on carbon brush holder 110; End cover 130, end cover 130 is connected to stator cylinder 120, end cover 130 has adjacently arranged spherical positioning cavity 131 and bearing clamp mounting cavity 132; Bearing clip 450, bearing clip 450 is installed in bearing clip mounting cavity 132; The spherical bearing 460 has one axial side abutting against the spherical positioning cavity 131 and the other axial side abutting against the bearing clamp 450. One end of the rotating shaft 410 is connected to the annular bearing 440, and the other end is connected to the ball bearing 460.

[0048] The two ends of the rotating shaft 410 are supported by annular bearings 440 and spherical bearings 460 respectively. With the positioning function of the spherical positioning cavity 131 of the end cover 130 on the spherical bearing 460, the coaxiality of the rotating shaft 410 can be greatly improved, the radial runout when the laminated iron core 421 and the winding 422 rotate synchronously can be reduced, and the motor can run more smoothly and quietly.

[0049] Compared to the use of ball bearings 460 to support both ends of the rotating shaft 410, this application uses an annular bearing 440 to support the end near the carbon brush holder 110. The axial length of the annular bearing 440 is smaller than that of the ball bearing 460, and there is no need to use a bearing clamp 450 or provide a bearing clamp mounting cavity 132 for the bearing clamp 450. This helps to reduce the axial space occupied and frees up more axial space to provide conditions for extending the axial length of the laminated iron core 421, winding 422 and magnet 430.

[0050] See Figure 2 , Figure 3 as well as Figure 8 Furthermore, the bearing clamp mounting cavity 132 has a longitudinal annular surface 1321 and an axial cylindrical surface 1322 that are perpendicular to each other; the longitudinal annular surface 1321 is connected to the spherical positioning cavity 131 and the axial cylindrical surface 1322; the bearing clamp 450 simultaneously abuts against the longitudinal annular surface 1321 and the axial cylindrical surface 1322. The bearing clamp 450 simultaneously abuts against the longitudinal annular surface 1321 and the axial cylindrical surface 1322, achieving bidirectional axial and radial positioning. Among them, the longitudinal annular surface 1321 dominates the axial positioning, providing an axial mounting reference for the bearing clamp 450; the axial cylindrical surface 1322 dominates the radial positioning, providing a radial mounting reference for the bearing clamp 450, ensuring the relative positional accuracy of the bearing clamp 450 with the end cover 130 and the spherical positioning cavity 131 after assembly, thereby ensuring the coaxiality of the spherical bearing 460.

[0051] In reference Figure 2 and Figure 8 The bearing clamp 450 has an annular base plate 451, a flange portion 452 and a plurality of claw plates 453. The annular base plate 451 abuts against the longitudinal annular surface 1321; the flange portion 452 extends from the outer side of the annular base plate 451 and abuts against the axial cylindrical surface 1322; the plurality of claw plates 453 extend from the inner side of the annular base plate 451 and abut against the ball bearing 460. The flange 452 engages with the axial cylindrical surface 1322 to perform the main radial positioning function and ensure concentricity; the annular base plate 451 fits against the longitudinal annular surface 1321 to form axial positioning; the inner claw plates 453 adapt to the spherical contour of the ball bearing 460 through their own elastic deformation, ensuring tight clamping and absorbing vibration and assembly errors, preventing the ball bearing 460 from moving or shifting; through the synergy of the radial positioning of the flange 452, the axial positioning of the annular base plate 451, and the elastic clamping of the claw plates 453, the ball bearing 460 is secured with high reliability.

[0052] Furthermore, the flange 452 is angled outwards, allowing it to guide the bearing clamp into the mounting cavity 132, resulting in smoother assembly. After pressing, the angled flange 452 generates a radial force pointing towards the axial cylindrical surface 1322, ensuring a tighter fit between it and the cavity wall of the bearing clamp 132, effectively preventing loosening due to vibration. This elastic fixing method with tension is more reliable than a simple vertical fit, further enhancing the holding force of the bearing clamp 450 during long-term use and the stability of the entire motor system.

[0053] See Figure 2The seat adjustment motor also includes a friction plate 470, an elastic pad 480, and a positioning ring 490. The friction plate 470 abuts against the ball bearing 460. The friction plate 470, elastic pad 480, and positioning ring 490 are sequentially fitted onto the rotating shaft 410 and are in close contact with each other. The thickness of the elastic pad 480 is greater than the distance between the friction plate 470 and the positioning ring 490. Because the thickness of the elastic pad 480 is greater than the distance between the friction plate 470 and the positioning ring 490, the elastic pad 480 is in an axially compressed state, which can continuously apply axial preload to the friction plate 470, making the friction plate 470 and the ball bearing 460 fit tightly together, effectively limiting the axial movement of the rotating shaft 410.

[0054] Optionally, the friction plate 470 is made of POM or nylon. POM typically has a coefficient of friction between 0.15 and 0.35, exhibiting a low coefficient of friction and good self-lubricating properties; nylon typically has a coefficient of friction between 0.1 and 0.3, also exhibiting a low coefficient of friction, excellent wear resistance, and good toughness. When the friction plate 470, made of POM or nylon, contacts the spherical bearing 460, the frictional resistance is low, which can reduce energy loss during the rotation of the spherical bearing 460 and improve motor efficiency. In this application, the friction plate 470 is made of POM.

[0055] Optionally, the elastic gasket 480 is made of nitrile rubber or fluororubber. Both nitrile rubber and fluororubber have excellent elastic recovery properties, which can continuously provide a stable preload, ensuring that the friction plate 470 and the ball bearing 460 are always in close contact, effectively limiting the axial movement of the shaft 410. In this application, the elastic gasket 480 is made of nitrile rubber.

[0056] See Figures 2 to 5 The seat adjustment motor also includes a commutator 800 and two carbon brushes 910. The laminated iron core 421 and the commutator 800 are mounted on the rotating shaft 410. The commutator 800 is located between the laminated iron core 421 and the carbon brush holder 110 and is connected to the winding 422 through the enameled wire 920. The two carbon brushes 910 are mounted on the carbon brush holder 110 and abut against the outer peripheral surface of the commutator 800. The EMC circuit is electrically connected to the two carbon brushes. The thermistor 610 and the inductor 620 are located on the periphery of the commutator 800.

[0057] During motor operation, the carbon brushes 910 and commutator 800 continuously engage and disengage mechanically, inevitably generating electrical sparks. These sparks are a major source of high-frequency electromagnetic interference (EMI), severely interfering with the normal operation of electronic devices such as radios, sensors, and control units within the vehicle. Therefore, by electrically connecting the EMC circuit to the two carbon brushes 910, the EMI generated by friction between the carbon brushes 910 and the commutator 800 can be specifically suppressed, reducing the impact on sensitive modules such as Hall effect circuits. Simultaneously, it resists external electromagnetic radiation intrusion, significantly improving the motor's EMI compatibility and meeting the anti-interference requirements of automotive electronic equipment.

[0058] Thermistor 610 and inductor 620 are arranged around the commutator 800, making full use of the radial redundant space of the commutator 800. The axial space occupied by thermistor 610, inductor 620 and commutator 800 overlaps, avoiding the occupation of axial area, and providing space for extending the axial length of electromagnetic components such as laminated iron core 421 and coil 621.

[0059] See Figure 6 The commutator 800 includes: The base 810 has several grooves 811 evenly formed along the axial direction on its outer peripheral surface. The outer peripheral surface of the base 810 between two adjacent grooves 811 forms an installation area. A number of commutator segments 820, the number of commutator segments 820 being the same as the number of installation areas; each commutator segment 820 is correspondingly installed in its respective installation area; Among them, the base 810 and the commutator 820 are insert injection molded structures.

[0060] The integrated structure of the base 810 and the commutator 820 eliminates the assembly gap between the parts. The commutator 820 is firmly connected to the base 810. Even if the motor starts, stops and reverses frequently, the position of the commutator 820 can be kept stable, so that the carbon brush 910 and the commutator 820 are always in good contact, the motor runs at a uniform speed, and the seat adjustment process is smooth and stable.

[0061] Furthermore, the outer peripheral surface of the base 810 is cylindrical, and the end face of the commutator segment 820 connected to the base 810 is an arc surface adapted to the cylindrical surface. During the one-piece injection molding process, the molten base 810 material can uniformly wrap around the arc surface of the commutator segment 820, and the contact area after cooling and solidification is significantly larger than that of planar bonding, resulting in higher bonding strength.

[0062] Furthermore, the commutator segment 820 has a commutator segment 820 base and a hook portion 822. The commutator segment 820 base is connected to the outer peripheral surface of the base 810, and the hook portion 822 is located at one end of the commutator segment 820 base. The commutator segment 820 base is mainly responsible for contacting the carbon brush 910 to perform current commutation; the hook portion 822 provides a dedicated fixing point for the enameled wire 920, which can be directly hooked onto the enameled wire 920. When the motor frequently starts and stops and commutates, the hook portion 822 can firmly lock the enameled wire 920.

[0063] Furthermore, the hook portion 822 has a folded section 8221 and an extension section 8222. One end of the folded section 8221 is connected to the commutator segment 820 substrate, and the other end is connected to the extension section 8222. The extension section 8222 extends obliquely toward the commutator segment 820 substrate. The extension section 8222, together with the folded section 8221 and the substrate, forms a closing structure. When the enameled wire 920 is embedded in the hook portion 822, the extension section 8222 can effectively confine the enameled wire 920 inside.

[0064] Furthermore, the base 810 has a limiting part 812, which abuts against the end face of the commutator segment 820 base near the hook part 822, and the limiting part 812 protrudes from the mounting area. The limiting part 812 protrudes from the mounting area, providing support to the commutator segment 820 base from the end, dispersing the axial tensile force borne by the hook part 822 after it is connected to the winding 422 via the enameled wire 920, and preventing cracking and deformation of the root of the commutator segment 820 due to stress concentration.

[0065] Furthermore, the limiting part 812 consists of two limiting posts, which are located on both sides of the hook part 822 and abut against the commutator segment 820 base. The abutment between the dual limiting posts and the commutator segment 820 base provides two-point support, offering the required axial limiting function while reducing the amount of plastic used.

[0066] Optionally, the commutator segment 820 is made of copper. Copper can be precisely machined into complex shapes (such as the commutator segment 820 with hook portion 822) through processes such as stamping, precision pressing, and milling to meet the insert requirements before integral molding. Its good plasticity also allows it to adapt to pressure and temperature changes during injection molding when integrally molded with the plastic base 810.

[0067] Optionally, the base 810 is made of bakelite. Bakelite has high hardness and strong resistance to deformation. The base 810 made of bakelite can resist strong centrifugal force when the motor rotates, preventing structural deformation and ensuring the roundness and overall shape stability of the commutator 800. Using bakelite as the construction material of the base 910 can effectively isolate the commutator segment 820 from other metal parts of the motor, avoiding the risk of current leakage or short circuit.

[0068] See Figure 9 The EMC circuit includes a surge protection element 630, which is disposed on the circuit board 500 and is electrically connected in parallel to two second power supply terminals 300 to suppress transient overvoltage interference.

[0069] Optionally, the surge protection element 630 is a TVS diode, a TSS diode, or a series combination of a resettable fuse and a TVS diode. Using a TVS diode, a TSS diode, or a combination of a resettable fuse and a TVS diode as surge protection elements 630 in the EMC circuit, connected between the two second power supply terminals 300, can specifically suppress transient overvoltage interference. This application uses a TVS diode as the surge protection element 630.

[0070] It should be noted that TVS (Transient Voltage Suppressor) refers to a transient voltage suppressor diode, while TSS (Thyristor Surge Suppressor) refers to a semiconductor discharge diode.

[0071] When a TVS diode is used as the surge protection element 630, the TVS diode's response time can reach sub-nanosecond or even picosecond levels, enabling instantaneous activation of protection in the event of a transient overvoltage between two power terminals. When the voltage exceeds its breakdown voltage, it quickly changes from a high-resistance state to a low-resistance state, precisely clamping the voltage within a safe range slightly higher than the circuit's normal operating voltage, preventing electrical components in downstream circuits from being damaged by overvoltage.

[0072] When TSS tubes are used as surge protection components 630, they have strong current carrying capacity and can quickly discharge strong surge energy generated by lightning strikes, motor start-up and shutdown.

[0073] When a series combination of a resettable fuse and a TVS diode is used as a surge protection element 630, if a transient overvoltage occurs between the two first power supply terminals 200, the TVS diode will respond quickly and clamp the voltage, absorbing the surge energy. If the overvoltage causes a continuous large current, the resettable fuse connected in series in the circuit will rapidly increase its resistance due to the excessive current, cutting off or limiting the circuit current and preventing the TVS diode from being burned out due to prolonged exposure to large current.

[0074] See Figure 5 and Figure 9 The inductor 620 has two inductors, each connected in series with one of the two second power supply terminals 300; one of the inductors 620 is connected in series with the thermistor 610; the EMC circuit includes a capacitor connected in parallel with the two second power supply terminals 300, and the two inductors 620 and the capacitor form an LC filter unit to ensure electromagnetic compatibility, preventing the motor from interfering with others and protecting the motor from interference.

[0075] Furthermore, the capacitors include a first filter capacitor 641 and a second filter capacitor 642, which are disposed on the circuit board 500. The first filter capacitor 641 and the second filter capacitor 642 are connected in series to form a series capacitor group, which is connected in parallel to the two second power supply terminals 300. The inductor 620, together with the series capacitor group, can filter out common-mode electromagnetic interference, reduce the impact of electromagnetic interference on core components such as the motor control chip and drive circuit, and ensure the stability of motor control signal transmission.

[0076] Furthermore, the capacitor includes a third filter capacitor 643, which is disposed on the circuit board 500 and connected in parallel to the two second power supply terminals 300. The combination of the inductor 620 and the third filter capacitor 643 can filter out differential mode electromagnetic interference.

[0077] Furthermore, the Hall circuit includes an RC low-pass filter 710 and a Hall IC element 720, with the RC low-pass filter 710 electrically connected to the Hall IC element 720. The RC low-pass filter 710 utilizes the charging and discharging characteristics of a capacitor to specifically filter out high-frequency electromagnetic interference in the automotive environment (such as noise generated by the sparks from the motor carbon brush 910), enhancing the anti-interference capability of the Hall signal and adapting to the complex electromagnetic environment of the vehicle. The Hall IC element 720 is positioned opposite a magnetic ring on the rotating shaft, and the rotation speed of the motor is detected by detecting the rotation of the magnetic ring.

[0078] Furthermore, the Hall IC element 720 has a positive pin 721, a negative pin 722, and a signal output pin 723. The positive pin 721 and the negative pin 722 are electrically connected to two first power supply terminals 200, respectively. The RC low-pass filter 710 has a resistor 711 and a fourth capacitor 712. One end of the resistor 711 is electrically connected to one of the first power supply terminals 200, and the other end is electrically connected to the signal output pin 723 of the Hall IC element. The fourth capacitor 712 is connected in parallel to the two first power supply terminals 200 and is grounded. The fourth capacitor 712 provides a low-impedance path to ground for high-frequency noise components. The resistor 711 increases the impedance between the noise source and the Hall IC element 720, enhancing the filtering effect; ensuring that the sensitive analog circuits inside the Hall IC element 720 (such as the Hall sensor and operational amplifier) ​​have a stable operating environment, thereby improving the accuracy and stability of the Hall IC element's magnetic field detection and preventing false triggering due to power supply noise.

[0079] Furthermore, the connection node between the first filter capacitor 641 and the second filter capacitor 642 is electrically connected to the Hall IC element 720. The filter capacitors suppress power supply side interference from being conducted to the Hall IC element 720, enabling the Hall IC element 720 to operate stably in the electromagnetic interference environment generated by the motor.

[0080] See Figure 5 and Figure 9 The motor operating circuit path is as follows: Two first power terminals 200 serve as positive and negative connection sections, respectively, and are connected to an external power source. One of the first power terminals 200 is connected to a circuit board 500. The printed circuit on the circuit board 500 is connected to a first inductor 620. The first inductor 620 is connected to a first carbon brush 910. The first carbon brush 910 is connected to a commutator 800. The commutator 800 is connected to the rotor 420 via an enameled wire 920. The commutator 800 is then connected to a second carbon brush 910. The second carbon brush 910 is connected to a second inductor 620. The second inductor 620 is connected to a thermistor 610. The thermistor 610 is connected to another second power terminal 200, making the entire circuit connected. When the power is turned on, the winding 422 on the rotor 420 generates magnetic force, which interacts with the magnet 430, thereby causing the rotor 420 to rotate and realizing the motor function. The grounding wire 930 is connected to the stator cylinder 120 for circuit protection.

[0081] It should be noted that since the second inductor is connected in series with the thermistor, their positions can be interchanged.

[0082] The above description is only a part of the embodiments of this application and does not limit the scope of protection of this application. Any equivalent device or equivalent process transformation made based on the content of this application specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this application.

Claims

1. An anti-interference seat adjustment motor, characterized in that, include: Rotor; Two second power terminals are connected to the positive and negative terminals of an external power source, respectively, to supply power to the rotor; The EMC circuit includes an LC filter and surge protection components. The LC filter is electrically connected to two second power supply terminals, and the surge protection components are connected in parallel to the two second power supply terminals.

2. The anti-interference seat adjustment motor according to claim 1, characterized in that: The surge protection component is a TVS diode, a TSS diode, or a series combination of a resettable fuse and a TVS diode.

3. The anti-interference seat adjustment motor according to claim 1, characterized in that: The LC filter includes a capacitor and two inductors; the capacitor is connected in parallel to the two second power supply terminals; the two inductors are connected in series to the positive and negative terminals of the external power supply, respectively.

4. The anti-interference seat adjustment motor according to claim 3, characterized in that: The capacitor includes a first filter capacitor and a second filter capacitor. The first filter capacitor and the second filter capacitor are connected in series to form a series capacitor group. The series capacitor group is connected in parallel to the two second power supply terminals.

5. The anti-interference seat adjustment motor according to claim 4, characterized in that: The capacitor includes a third filter capacitor, which is connected in parallel to the two second power supply terminals.

6. The anti-interference seat adjustment motor according to claim 1, characterized in that: The EMC circuit also includes a thermistor, which is connected in series between the external power supply and the rotor.

7. The anti-interference seat adjustment motor according to claim 4, characterized in that: The interference-resistant seat adjustment motor also includes Two first power terminals are connected to the positive and negative terminals of an external power source, respectively. A Hall effect circuit, which is electrically connected to two first power supply terminals, has an RC low-pass filter and a Hall IC element, the RC low-pass filter being electrically connected to the Hall IC element.

8. The anti-interference seat adjustment motor according to claim 7, characterized in that: The connection node between the first filter capacitor and the second filter capacitor is electrically connected to the Hall IC element.

9. The anti-interference seat adjustment motor according to claim 7, characterized in that: The Hall IC element has a positive pin, a negative pin, and a signal output pin, and the positive pin and the negative pin are respectively electrically connected to the two first power supply terminals; The RC low-pass filter has a resistor and a fourth capacitor. One end of the resistor is electrically connected to one of the first power supply terminals, and the other end is electrically connected to the signal output pin of the Hall IC element. The fourth capacitor is connected in parallel to the two first power supply terminals and is grounded.

10. A car seat, characterized in that, Includes the interference-resistant seat adjustment motor as described in any one of claims 1 to 9.

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