Printed circuit board assembly and multi-phase motor using same
By designing a compact plastic-clamped copper mount bracket and thermally conductive adhesive structure on the printed circuit board of the automotive cooling fan motor controller, the problems of large area, poor heat dissipation performance, high cost and large EMC interference are solved, and more efficient heat dissipation and better EMC performance are achieved.
Patent Information
- Application Number
- CN202421825860.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-07-31
AI Technical Summary
The existing automotive cooling fan motor controller has large printed circuit boards, poor heat dissipation performance, high cost, and large EMC interference, affecting reliability and life.
A compact printed circuit board assembly is designed, and a plastic-encapsulated copper bar bracket is used to conduct high currents, and the EMC performance is improved through the design of U-phase, V-phase, and W-phase connection sheets. At the same time, thermal conductivity glue is installed on both sides of the PCB board to improve heat dissipation effect.
It realizes printed circuit board components with compact structure, good heat dissipation performance, low cost and good EMC performance, solves the problems of large area of printed circuit boards, poor heat dissipation performance, high cost and large EMC interference in the original technology, and improves the stability and reliability of multi-phase motors.
Smart Images
Figure CN222814647U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a circuit board and a motor structure, in particular to a printed circuit board component and a multi-phase motor using the component. Background Art
[0002] Usually, the automobile cooling fan motor controller adopts a single-board structure, that is, the control circuit and the power conversion circuit that converts DC power into AC power are arranged on the same printed circuit board (PCB). The copper layer on the printed circuit board carries a large current, and the power circuit has a great interference on the EMC of the control circuit. For the DC brushless motor of the automobile cooling fan with a power of 1kW or even higher, the working current of the motor and controller components is large, the heat is large, and the working temperature of the electronic components is high, which affects the reliability and life of the automobile cooling fan motor controller, and even causes the cooling fan to fail to work properly, which seriously affects the safety of people and vehicles. In order to ensure the normal operation of the controller, the heat generated in the controller printed circuit board assembly (PCBA) needs to be dissipated as soon as possible. The traditional method adopts measures such as expanding the area of the printed circuit board and increasing the size of the radiator to solve the heat dissipation problem of the high-power automobile cooling fan motor controller, which will cause the cooling fan motor to be too large in size and too heavy, which runs counter to the current requirements of lightweight, environmental protection and strict longitudinal space restrictions on automobiles. Summary of the invention
[0003] The utility model provides a printed circuit board assembly with compact structure, good heat dissipation performance, low cost and good EMC performance, and a multi-phase motor using the assembly, which solves the technical problems existing in the prior art of large printed circuit board area, poor heat dissipation performance of the multi-phase motor, high cost and large EMC interference.
[0004] The above technical problems of the utility model are solved by the following technical solutions: a printed circuit board assembly, including a PCB board, on which electronic components and control circuits realizing power supply and signal processing functions are installed, and a plastic-coated bracket is also installed on the PCB board, and the plastic-coated bracket includes a power phase connecting piece, a U phase connecting piece, a V phase connecting piece, and a W phase connecting piece, and inductors and cylindrical capacitors are welded on the power phase connecting piece, and large currents are conducted by the plastic-coated bracket. The large current components such as inductors and cylindrical capacitors are installed on the plastic-coated bracket, so that the plastic-coated bracket plays the role of circuit conduction, carrying large currents and improving EMC. At the same time, the U phase connecting piece, the V phase connecting piece, and the W phase connecting piece are installed on the plastic-coated bracket, so that the connection points of the U phase, the V phase, and the W phase can be separated further, which is convenient for the arrangement of the remaining components on the PCB board and the arrangement of the circuit on the PCB board. The design of the plastic-coated bracket improves the original problem of connecting the power supply and ground wires on the PCB board, which requires a very wide copper sheet for connection, resulting in a large circuit board area. At the same time, it also improves the technical problem of the power current going around the PCB board for most of the circle, thus causing poor EMC performance.
[0005] Preferably, the power phase connecting piece includes a first power phase connecting piece and a second power phase connecting piece, and the U-phase connecting piece, the V-phase connecting piece and the W-phase connecting piece have the same shape, and the U-phase connecting piece, the V-phase connecting piece and the W-phase connecting piece are installed in a T-shape on the upper side of the first power phase connecting piece, and the connecting legs of the U-phase connecting piece, the V-phase connecting piece and the W-phase connecting piece are bent and fixed on the PCB board. The three-phase connecting pieces with T-shape leave more installation space for other components, facilitate wiring on the PCB board, and improve wiring flexibility. The three-phase connecting pieces of the plastic-coated bracket have the same shape and are unified into the same part, which reduces mold costs and the number of parts.
[0006] Preferably, an inductor and a cylindrical capacitor are installed on the side of the first power phase connecting piece, the inductor is welded in parallel on the plastic-coated bracket, the capacitor is located below the inductor, and the position of the PCB board corresponding to the inductor and the cylindrical capacitor is a blank space. One piece of the PCB board is omitted to accommodate the inductor and the cylindrical capacitor, making the overall volume smaller and the structure more compact.
[0007] Preferably, the plastic-coated bracket includes two layers of copper bars, a plastic spacer is arranged between the two layers of copper bars, wherein the upper copper bar includes a U-phase connecting plate, a V-phase connecting plate, a W-phase connecting plate and a first power phase connecting plate, and the lower copper bar includes an LS connecting plate, a GND connecting plate and a first power phase connecting plate. The plastic-coated bracket is made of sheet metal stamping and secondary injection molding, including a plurality of copper bars and a plastic spacer, the plastic spacer is used to isolate each copper bar, and the two layers of copper bars + the plastic spacer form a sandwich structure. The vertical height is small, and each connecting plate belongs to multiple circuits, so heat dissipation is achieved relatively well.
[0008] A multiphase motor includes the aforementioned printed circuit board assembly, a rear cover assembly is provided on one side of the printed circuit board assembly, a motor bracket is provided on the other side of the printed circuit board assembly, a stator assembly and a rotor assembly are installed on the other side of the motor bracket, a thermal conductive adhesive is provided between the rear cover assembly and the printed circuit board assembly, and a thermal conductive adhesive is provided between the motor bracket and the printed circuit board assembly. The thermal conductive adhesive is provided on both sides of the printed circuit board to improve the heat dissipation effect, thereby ensuring the service life and stability of the electronic components.
[0009] Preferably, the thermally conductive adhesive is distributed at the position of the plastic-coated bracket and the positions of the inductor and cylindrical capacitor, so as to dissipate heat for high-power components and improve the heat dissipation effect.
[0010] Preferably, the thermal conductive adhesive between the rear cover assembly and the printed circuit board assembly is coated on the plastic-coated bracket, the inductor and the cylindrical capacitor. The PCB board heatsink transfers the heat from the plastic-coated bracket to the rear cover, improving the heat dissipation effect, and it is more convenient to coat the thermal conductive adhesive between the plastic-coated brackets.
[0011] Preferably, a thermally conductive adhesive is provided between the motor bracket and the printed circuit board assembly and coated on the motor bracket.
[0012] Therefore, the utility model of a printed circuit board assembly and a multi-phase motor using the assembly have the following advantages: a plastic-coated copper bar bracket is installed on the PCB board, and each connecting piece on the copper bar bracket is connected to a different circuit respectively, which is convenient for arranging other components on the PCB board, and at the same time, a large current is conducted between the plastic coatings, which reduces the difficulty of routing the PCB board, reduces the size of the PCB board, reduces the cost, and ensures the EMC performance. At the same time, a compact and small PCB board is installed on the multi-phase motor, and thermal conductive glue is installed on both sides of the PCB board to improve the heat dissipation effect and ensure the stability of the multi-phase motor. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 A perspective view of a printed circuit board assembly.
[0014] Figure 2 yes Figure 1 Schematic diagram of the exploded view of the plastic-encapsulated bracket.
[0015] Figure 3 It is an exploded diagram of a multi-phase motor.
[0016] Figure 4 is a schematic diagram of a printed circuit board with thermally conductive adhesive. DETAILED DESCRIPTION
[0017] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.
[0018] Example:
[0019] like Figure 1 and 2As shown, a printed circuit board assembly includes a PCB board 1, on which electronic components 3 and a bracket assembly 2 are installed. The bracket assembly 2 includes a plastic-coated copper busbar bracket, which is connected to the PCB board 1 through wave soldering. The plastic-coated copper busbar bracket is composed of two layers of copper busbars and a plastic spacer 11 between the copper busbars. The plastic-coated copper busbar bracket includes a first power phase connecting piece 10, a U phase connecting piece 7, a V phase connecting piece 8 and a W phase connecting piece 9 located on the upper layer. The U phase connecting piece 7, the V phase connecting piece 8 and the W phase connecting piece 9 have the same shape, and the U phase connecting piece 7, the V phase connecting piece 8 and the W phase connecting piece 9 are installed in a T-shape on the upper side of the first power phase connecting piece 10. The connecting legs of the U phase connecting piece 7, the V phase connecting piece 8 and the W phase connecting piece 9 are bent and fixed on the PCB board 1, and are connected to the U phase, V phase and W phase on the PCB board 1. A plurality of inductors 4 and cylindrical capacitors 5 are installed on the side of the first power phase connecting piece 10. The inductors 4 are welded in parallel on the first power phase connecting piece 10. The cylindrical capacitors 5 are located below the inductors 4. The positions of the PCB board 1 corresponding to the inductors 4 and the cylindrical capacitors 5 are blank spaces to facilitate the installation of the inductors 4 and the cylindrical capacitors 5. The lower copper busbar includes an LS connecting piece 12, a GND connecting piece 13 and the first power phase connecting piece 10. An electrolytic capacitor 6 is installed in the groove of the first power phase connecting piece 10.
[0020] like Figure 3 and 4 As shown, a multi-phase motor includes the above-mentioned printed circuit board assembly 17, a rear cover assembly 15 is provided on one side of the printed circuit board assembly 17, a motor bracket 18 is provided on the other side of the printed circuit board assembly 17, and a stator assembly 19 and a rotor assembly 20 are installed on the other side of the motor bracket 18.
[0021] Thermally conductive adhesive 16 is coated on the positions of the plastic-coated copper plate bracket, the inductor and the cylindrical capacitor of the printed circuit board assembly, and thermally conductive adhesive 16 is coated on the corresponding positions of the motor bracket.
[0022] The specific embodiments described herein are merely examples of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.
Claims
1. A printed circuit board assembly, comprising a PCB board, on which electronic components and control circuits for realizing power supply and signal processing functions are mounted, characterized in that: The PCB board is also equipped with a plastic-coated bracket, which includes a power phase connecting piece, a U phase connecting piece, a V phase connecting piece, and a W phase connecting piece. Inductors and cylindrical capacitors are welded on the power phase connecting pieces, and large currents are conducted by the plastic-coated bracket.
2. A printed circuit board assembly according to claim 1, characterized in that: The power phase connecting piece includes a first power phase connecting piece and a second power phase connecting piece. The U-phase connecting piece, the V-phase connecting piece and the W-phase connecting piece have the same shape. The U-phase connecting piece, the V-phase connecting piece and the W-phase connecting piece are installed in a T shape on the upper side of the first power phase connecting piece. The connecting feet of the U-phase connecting piece, the V-phase connecting piece and the W-phase connecting piece are bent and fixed on the PCB board.
3. A printed circuit board assembly according to claim 2, characterized in that: An inductor and a cylindrical capacitor are installed on the side of the first power phase connecting piece. The inductor is welded in parallel on the plastic-coated bracket. The cylindrical capacitor is located below the inductor. The position of the PCB board corresponding to the inductor and the cylindrical capacitor is a blank space.
4. A printed circuit board assembly according to claim 1, characterized in that: The plastic-coated bracket includes two layers of copper bars, a plastic spacer is provided between the two layers of copper bars, wherein the upper copper bar includes a U-phase connecting plate, a V-phase connecting plate, a W-phase connecting plate and a first power phase connecting plate, and the lower copper bar includes an LS connecting plate, a GND connecting plate and a first power phase connecting plate.
5. A multiphase motor, comprising a printed circuit board assembly as claimed in any one of claims 1 to 4, a rear cover assembly being provided on one side of the printed circuit board assembly, a motor bracket being provided on the other side of the printed circuit board assembly, a stator assembly and a rotor assembly being installed on the other side of the motor bracket, characterized in that: A heat-conducting adhesive is provided between the rear cover assembly and the printed circuit board assembly, and a heat-conducting adhesive is provided between the motor bracket and the printed circuit board assembly.
6. A multi-phase motor according to claim 5, characterized in that: The thermal conductive adhesive is distributed at the position of the plastic-coated bracket and the positions of the inductor and the cylindrical capacitor.
7. The multi-phase motor according to claim 5, characterized in that: The heat-conducting adhesive between the rear cover assembly and the printed circuit board assembly is coated on the plastic-coated bracket, the inductor and the cylindrical capacitor.
8. The multi-phase motor according to claim 5, characterized in that: A heat-conducting adhesive is provided between the motor bracket and the printed circuit board assembly and coated on the motor bracket.