A compact high-power-density servo drive design

Abstract

Brushless DC motors are indispensable components in contemporary industrial, medical, military and household appliances. Due to its high efficiency, long life, large starting torque and flexible control speed control, it has received extensive attention. With the rapid development of modern motor technology and communication technology, the size of heavy-duty industrial equipment, precision control instruments and advanced detection devices is reduced, and a compact brushless DC motor driver with high integration and reliability and advanced communication networks interface is compatible to meet the requirement of the market and industrial.

This thesis is investigating how to design and evaluate a compact drive module to drive three-phase BLDC motor with both hardware and software for the brushless DC motor control system in a significant compact size, which could be used on medical equipment, robot arm and vehicles in a small scale. This research investigates the fundamental mathematical BLDC motor model and develops controllers and motor driver according to certain design requirements. The motor driver is designed based on the STM32F107 microcontroller from STMicroelectronics and the DRV8332 Integrated Digital Motor Control module with a three-stage power supply strategy. To achieve the correct computation of the BLDC motor, three complementary PWM drive signals, motor control communication command and several warning structures have been built. Finally, a compact PCB board with the corresponding driving program are presented with proved performance.