A low cost special circuit for brushless direct current motor controller

Abstract

In order to reduce the complexity of the internal circuit of brushless direct current motor(BLDCM) controller, a special circuit with simple structure is proposed, which can be used to drive the microcontroller of BLDCM. The position signal of the rotor is transmitted to the controller circuit by the position sensor on the motor, and the output truth table of the position sensor is obtained. Then the corresponding digital logic circuit is obtained by using Logisim software. The simulation waveform is obtained by using the simulation tool NC-Verilog simulator of Cadence. With 80C51 as the main control chip, the final verification and analysis is completed by the way of external circuit. Through this special circuit, the rotor of the motor can rotate clockwise or counterclockwise. This special circuit can be used for the controller of brushless DC motor with low cost and low control precision.

Keywords

• brushless dc motor
• rotor position
• special circuit
• low cost