Two-chip brushless DC motor drive control system and control method thereof

Abstract

The present invention relates to a drive control system for controlling a brushless motor by using the combination of two chips. According to the system, the e ARM and CPLD combined control is used, the set values of the torque, speed and position of the system are from a host machine, and the feedback value of a motor state is calculated according to the feedback value of a three-phase Hall sensor in the motor. The ARM is connected to the host machine and receives the set values sent by the host machine and carries out torque control, speed control or position control according to the command of the host machine. The CPLD receives feedback signal of the three-phase Hall sensor, carries out position and speed calculation and sends the calculation values to the ARM. The ARM carries out control operation by combining the calculation values and the set values and sends a command word. The CPLD receives the command word of the ARM and parses the command word as a control command, and the motor is controlled to run through the driving circuit of the motor. According to the system, the speed and position sensors are not needed, the system structure is simplified, and the high precision control of the torque, rotation speed and position can be realized.

Description

technical field [0001] The invention belongs to the technical field of servo control, and relates to a brushless motor drive control system and a control method. Background technique [0002] A brushless DC motor consists of a rotor made of permanent magnet material, a stator with coil windings and a position sensor. While it has the superior speed regulation performance of DC motors, it also eliminates various problems caused by carbon brushes and slip ring structures. It also has the advantages of simple structure, high efficiency and reliable operation. [0003] The speed regulation method of the brushless DC motor is usually realized by open-loop PWM modulation, and the change of the speed is realized through the external given duty ratio, but this speed regulation method is suitable for occasions that do not require high speed regulation, and cannot meet the requirements of relatively high speed. High speed regulation performance requirements, it is impossible to achi...

AI Technical Summary

Problems solved by technology

[0003] The speed regulation method of the brushless DC motor is usually realized by open-loop PWM modulation, and the change of the speed is realized through the external given duty ratio, but this speed regulation method is suitable for occasions that do not require high speed regulation, and cannot meet the requirements of relatively high speed. High speed regulation performance requirements, can not achieve high precision control of torque speed

At the same time, the traditional single-chip microcomputer control system, special motor control system and DSP control system, when implementing fault protection, the fault protection circuit realized has a long response delay, which reduces the safety of the system

[0004] The closed-loop speed control and closed-loop position control system of the traditional brushless DC motor needs to use the encoder as a sensor to detect the speed and position of the motor, which increases the production cost of the system when used

Images