Most of audio players on the market use the hardware filter Abstract. As one kind of special motor, Brushless DC motor has characteristics of high efficiency, simple control, wide application range and others. The traditional brushless DC motor adopts square wave control, which cannot meet the noise requirements in some application fields. In this paper, a vector control system of brushless motor based on Hall sensor is introduced, and the system structure is introduced from the hardware and software of the system. The experimental results show that the vector control system introduced in this paper can greatly improve the efficiency and reduce the operation noise.
The Overall Design Scheme of the SystemBrushless DC motor vector control system is composed of power supply, controller, motor, speed regulator, PC and other components. The power supply provides the necessary power for the controller, and the controller, motor and speed regulator jointly fulfill the application requirements of the control system. After the system is powered on, self-check is made to ensure that the controller can work normally. The controller processes according to the signal issued by the speed regulator, for example, after the starting signal is obtained, the motor starts to run. During the operation of the motor, the motor state information, such as the speed can be sent to the PC by the serial port.
The Hardware Design of the SystemThe hardware system of the brushless DC motor vector control system is composed of motor, drive circuit, control circuit, detection circuit, power circuit and so on. The hardware system structure is shown in Figure1 the driving circuit adopts three-phase bridge type two-level voltage inverter structure three-phase Inverter Bridge, which has 6 power switch devices, and the switch devices select High-performance Power MOSFET. The system control circuit uses the ST Company STM32F103 as the control chip. On the one hand, the control circuit will collect voltage, current and position signal to complete the vector control algorithm. On the other hand, the motor start stop control is completed according to the potentiometer signal. The detection circuit mainly includes phase current, bus current and Holzer position sensor signal detection, and the current and position information obtained are used to complete the vector control algorithm. The power circuit converts the external
