hub motor controller main components
hub motor controller includes power and control of the Department of the Ministry of Figure (1): Power Ministry to provide three-phase power to the motor, control by the Ministry of the demand for converting the input power frequency. Department of directly to the DC power input (typically 24V) or AC input (110V/220 V), if the input is alternating current converters have been the first (converter) to DC. Either DC or AC input to input into the motor coil will be required before the DC voltage from the converter (inverter) turn into a three-phase voltage to drive the motor. Converter (inverter) generally consists of six power transistors (Q1 ~ Q6) into the upper arm (Q1, Q3, Q5) / lower arm (Q2, Q4, Q6) connected through the motor coil motor as the control switch. Control Department provides the PWM (pulse width modulation) determine the frequency and the power transistor switch converter (inverter) commutation time. DC bldc motor driver generally want to use the change in speed when the load can be stabilized at the set value will not change too much speed control, so the motor equipped with Hall sensors that can sense magnetic fields (hall-sensor), as the speed The closed-loop control, but also as the basis for phase sequence control. But this is only used as a speed control and can not be used as a positioning control.