Driving motor for automobile cooling fan

Abstract

The invention discloses a driving motor for an automobile cooling fan, comprising a controller assembly, a stator winding and an outer rotor assembly, wherein the controller assembly comprises a heatsink, a rear end cover, a conductive bracket and a PCBA board; three through holes are disposed in the heat sink; three mounting holes are disposed in the conductive bracket; positioning embedding grooves are disposed in the back of the conductive bracket; a conductive link is inserted into each mounting hole; the front end of each conductive link is electrically connected to a corresponding coilof the stator winding; a tail section of each conductive link is bent and then embedded into the corresponding positioning embedding groove; the tail end of each conductive link stretches out of the corresponding positioning embedding groove after being bent; the heat sink and the conductive bracket are provided with positioning support structures for positioning and supporting the PCBA board, andinductors, capacitors, conductive links and wire harness conductive pins are all welded and fixed to corresponding conductive holes in the PCBA board. According to the driving motor for the automobile cooling fan, the stator winding and the PCBA board are better electrically connected, conductive pieces are omitted, the welding operation is simpler, and the conductive efficiency is improved.

Description

technical field [0001] The invention relates to a driving motor, which is used to drive a cooling fan of an automobile. Background technique [0002] Motors are commonly used power devices and are used in various industries. At present, brushless motors can be controlled by PCBA boards. The structure of the brushless motor mainly includes a controller assembly, a stator assembly, and a rotor assembly, wherein the controller assembly includes a shell composed of a heat sink and a rear end cover, and a conductive support and a PCBA board are arranged in the shell, and the heat sink There is a central axis on the front of the heat sink, and the heat sink is provided with a capacitor installation area, an inductance installation area, a conductive bracket installation area, and a harness joint area. The conductive bracket is installed in the conductive bracket installation area, and the capacitor and inductor are installed in the corresponding area. , the PCBA board is located ...

AI Technical Summary

Problems solved by technology

However, the conductive connecting rod is welded with the conductive connecting piece, the connecting piece is welded with the PCBA board, and the other end of the conductive connecting rod is welded with the winding. There are many welding parts, and the production is difficult; especially the pointed pins on the connecting piece need to be connected with the PCBA board. The alignment of the tiny connection holes makes assembly difficult. At the same time, the connection between the connecting piece of the current conductive bracket and the conductive connecting rod is only fixed by welding, and the length of the conductive connecting rod is relatively long. In the actual assembly process, it may Because the position of the connecting rod is wrong or deformed, it is necessary to move the connecting rod. In this way, the connecting rod and the conductive connecting piece are easily loosened, resulting in poor point contact.

[0004] 2. In the current controller assembly, the PCBA board and the heat sink are bonded by heat-conducting glue, and due to the fluctuation of the amount of glue applied, the bonding between the PCBA board and the heat sink is uneven, and the support of the PCBA board is not smooth. Unreasonable, even more difficult to guarantee

[0005] 3. In the current controller components, the conductive bracket is provided with wire harness conductive pins, which are used to connect and conduct electricity with the wire harness, while the conductive bracket is only placed in the conductive bracket placement area of ​​the heat sink, and the wire harness is connected to the wire harness conductive pins. , the wire harness may be pulled during subsequent use, and the pulling force may deform the conductive bracket, and then the conductive pins of the wire harness may contact with the heat sink to short circuit

[0006] 4. In the current controller assembly, the conductive connecting rod directly passes through the through hole and is welded with the stator winding, and the motor will vibrate during operation. During the vibration process, the conductive connecting rod may contact the through hole, resulting in intermittent the short circuit,

[0007] 5. When assembling the central shaft and the cooling seat in the current controller assembly, the central shaft is pressed into the fixed cylinder of the cooling seat by a press to fit tightly with the fixed cylinder. However, the extension length of the central shaft directly affects The assembly gap between the stator winding and the rotor assembly is limited. Therefore, the central shaft needs to be axially positioned for the insertion depth, and the current positioning is to control the insertion depth of the central shaft by controlling the stroke of the press head of the press. Although this can be achieved The purpose of control, but there may be errors in the detection of the stroke of the indenter, and absolute positioning cannot be achieved

[0008] 6. Since the size of the motor used to drive the car cooling fan is limited by the installation space, the size cannot be enlarged. Therefore, the number of magnetic poles of the motor has a range, so the size of the magnetic tiles is relatively small, which is difficult to install. It is difficult to locate the spacing and position, and it is difficult to guarantee the installation accuracy

[0009] 7. During the rotation of the current outer rotor assembly, the transition between the stator winding and the magnetic poles is relatively rigid, resulting in torque ripple and noise and vibration

Images