Brushless dc motor controller is a kind of electric current pulse can be limited within 5% of the five level inverter, if do not use the PWM modulation, and USES along with the change of winding back emf in the motor controller to change on the three-phase winding voltage method, can greatly reduce the current ripple, reach the purpose of reduce the eddy current loss and torque pulsation. The fundamental reason is that, in the motor controller of three-phase winding voltage PWM modulation voltage is no longer a fixed value, but the dc voltage change with counter electromotive force. Use of brushless dc motor controller for regulating range and power are very small, do not need to use the multilevel inverter. If use multilevel inverter structure, not only increased the complexity of circuit, also make the tiny current pulse is unable to avoid. As a result, the variable voltage dc power supply is more appropriate choice, in the future the system design, the choice of voltage-controlled voltage source is likely to be key to a circuit's electrical performance. Compared with other types of motor, brushless dc motor has a superior performance, has been widely penetrated into daily life and industrial equipment field, has the good market prospect. As the brushless dc motor controller, of course, the influx of tuyere, more and more enterprises to choose through the way of project outsourcing in terms of product development, with the smallest cost to complete product development benefit maximization.
