Novel structure motor driver

Abstract

The invention discloses a novel structure motor driver. A capacitor module part comprises capacitors uniformly distributed on capacitor PCBs (printed circuit board) in an l shape; the capacitors are arranged in a way of being embedded in an aluminum case; a power module busbar copper sheet is welded and arranged on the power module PCBs; power tubes are uniformly arranged at the two sides of the power module PCBs in lines; an output copper post is also arranged on the power module PCB; board to board connection plug pins are arranged on board to board connection pin seats; the capacitor PCBs are connected with positive and negative electrode copper strips of a power module on the power module PCBs through screws. The novel structure motor driver also comprises a main control PCB arranged at the upper part of the power module PCBs; the main control PCB and the power module PCBs are communicated through a positive and negative electrode busbar copper strip; a control part circuit is provided with a branch circuit for collecting voltage drop in the work process of the power device and directly collecting output current of the power device by a current sensor. The novel structure motordriver has the advantages that the structure is optimized and more reasonable; the capacitance can achieve the capacitor compensation current features to the maximum degree; partial heating quantityof the power module is reduced; the heat radiation condition is improved.

Description

technical field [0001] The invention relates to the technical field of drivers, in particular to a motor driver with a new structure. Background technique [0002] The motor controller receives the DC output from the battery, and converts the DC power into a three-phase AC output, so each power module part corresponds to one phase of the three-phase power, and is used to output U, V, W three-phase power to the motor of one-phase power supply. The structural design of the motor driver has a great influence on the performance of the driver. The existing structural design of the driver is unreasonable, especially the distribution of the power drive part and the capacitor is unreasonable. For example, the existing half-bridge module generally includes multiple sets of power tube devices , multiple positive terminals, multiple negative terminals, and power bus filter capacitors, so many components bring difficulties to the circuit layout and mechanical installation layout. As t...

AI Technical Summary

Problems solved by technology

The structural design of the motor driver has a great influence on the performance of the driver. The existing structural design of the driver is unreasonable, especially the distribution of the power drive part and the capacitor is unreasonable. For example, the existing half-bridge module generally includes multiple sets of power tube devices , multiple positive terminals, multiple negative terminals, and power bus filter capacitors, so many components bring difficulties to the circuit layout and mechanical installation layout. As the temperature rises, the output power drops significantly, so the output power of the driver cannot be maintained to the maximum extent. The reasons for this situation are as follows:

[0003] 1. The capacitance distribution is unreasonable in structural design, so that in practical applications, the capacitance cannot provide the maximum compensation current

[0004] 2. The power drive part does not adopt a modular design, and the three-phase circuit is not fully balanced

[0005] 3. The power device and the output terminal are not directly connected, but are connected by PCB transition, which leads to severe heating of the connected part of the PCB during high current, which limits the current output

[0006] 4. The production process is complicated and it is difficult to realize automatic production

[0007] 5. The core temperature of the power device cannot be directly detected, and an external temperature sensor is usually used to stick it next to or near the power device. Due to the characteristics of the temperature sensor, the core temperature of the power device cannot be measured in real time. Reduce the output power of power devices

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