As we all know, brushless dc motor controller is a kind of synchronous motor controller, the rotor speed of the motor controller that is motor controller speed rotating magnetic field of the stator and rotor pole (p)Impact: n = 60. f / p。 In case the number of rotor fixed, change the frequency of the stator rotating magnetic field can change the speed of the rotor. Brushless dc motor controller is the synchronous motor controller combined with electronic control (Drive), control the frequency of the stator rotating magnetic field and the motor controller of rotor speed feedback to the control center again, in order to approach to achieve dc motor controller features. That is brushless dc motor controller can be within the rated load when the load changes can still maintain control motor controller rotor speed. The power can be directly to dc input (Generally for 24 v)Or in an alternating current input (110v/220 v）Will have to the first, if the input is an alternating current converter (converter）Converted to dc. Both input dc or ac input coil to turn to motor controller must be before the dc voltage by the inverter (inverter）Into three phase voltage to drive the motor controller. Inverter (inverter）By six power transistor (commonlyq1 ~ q6)Divided into the upper arm (q1和q3, q5)/ lower arm,第四季度,q2 q6)Connected to the motor controller as control flows through the motor controller coil switch. Control department provides PWM (Pulse width modulation)Decision power transistor switching frequency and the inverter (inverter）The timing of the commutation. Generally want to use the brushless dc motor controller in the speed can be stable in value when the load changes will not change speed control, so can induced magnetic field of hall sensor mounted inside the motor controller (大厅-传感器)As the speed closed loop control, and at the same time as the basis of phase sequence control. But that is only used as a speed control and is not to be used as a positioning control. The above is the structure of the brushless dc motor controller, knowledge of the structure of brushless dc motor controller, is conducive to the follow-up we use it better, and make it play a better effect. Small make up: Sara
