The difference between DC brushless motor and permanent magnet synchronous motor
2015/7/27 14:40:15
The difference between DC brushless motor and permanent magnet synchronous motor
Brushless DC motor usually adopts a tile rotor magnet, through magnetic circuit design, can obtain the air gap magnetic trapezoidal wave density of stator winding with concentrated windings, so the Induction EMF is trapezoidal wave. The control of DC brushless motor requires position feedback, so it is necessary to have a position sensor or sensorless estimation technology, which is a kind of automatic control system. Each phase current is controlled as far as the square wave is controlled, and the output voltage of the inverter is controlled according to the method of the brush DC motor PWM.
In essence, the brushless DC motor is also a permanent magnet synchronous motor, speed control is also a practical variable frequency variable speed.
Generally, the permanent magnet synchronous motor with stator windings in three-phase distribution He Yongci rotor magnetic circuit structure and winding distribution ensure the Induction EMF waveform is sine, stator voltage and current applied should be sinusoidal, usually by AC voltage frequency. The permanent magnet synchronous motor (PMSM) control system often adopts the automatic control system, and also needs the position feedback information, so it can adopt the advanced control strategy of vector control (field oriented control) or direct torque control.
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