With the development of control technology and the improvement of the social requirements for energy saving, as a new type of brushless dc motor, high efficiency of motor is widely used. Traditional way of using square-wave brushless dc motor control, simple control, easy to implement, and has such problems as the torque ripple and phase noise, in some application fields of the request for noise have limitations. According to these applications, using sine wave control can well solve the problem.
sine wave of dc brushless motor control profile
sine wave of dc brushless motor control is through the motor winding up a voltage, produce harmonic current in the motor winding, by controlling the amplitude and phase of the sinusoidal current to achieve the purpose of controlling motor torque. Compared with the traditional square wave to control the motor phase current is sinusoidal, and continuous change, no change of phase current mutation, so the motor running low noise.
, according to the complexity of the control of the brushless dc motor control can be divided into sine wave: simple sine wave control and complicated sine wave control.
(1)Simple sine wave control:
the motor winding up a voltage, the motor phase voltage as the sine wave, because of the motor winding to the perceptual load, so the motor phase current is for sine wave. By controlling the motor phase voltage amplitude and phase to phase and amplitude control current and voltage loop control, implementation is simple.
(2)Complex sinusoidal control:
unlike simple sine wave control, complex sinusoidal control target for the motor phase current, current loop, through the direct control of the phase and amplitude control motor phase current purposes. Due to the motor phase current is sine signal, therefore the need for current decoupled operations, is relatively complex, common for the field oriented control (船And the direct torque control (DTC)And so on.
