Abstract
Brushless DC Motor (BLDCM) is a rapid development of a new type of motor, as compared with the traditional DC motor, which replace the use of electronic machines for mechanical phase, making the motor’s structure more simple and reliable operation, easy maintenance, etc., also have operation of high efficiency, low noise, as well as non-excited and good speed performance. And small size, high efficiency. In today's national economic departments, the military industry, aerospace, household appliances and so on have been widely used. And with the development of new high-power devices, to improve the performance of permanent magnetic materials, the price reduction, control technology, brushless DC motor is bound to be greater development. In this paper, brushless DC motor controller for the study, first introduced at home and abroad, brushless DC motor control system development and research, are discussed in more detail BLDCM the basic structure and working principle, speed control system and the location of sensors and detection methods. Major research PIC18F4455 microcontroller-based control system program, using Application Specific Integrated Chip Si9979, switching power devices are suitable for small and medium-sized electric power field-effect transistor (MOSFET), using of an enhanced single-chip PWM mode control motor speed. PWM output have the GAL chip protection against arm straight up and down the bridge. And then the program is designed for control system hardware, software and related circuit design.