Control of brushless dc motor controller structure

In recent years, the brushless dc motor controller is applied more and more widely, it refers to no brush and commutator ( Or collector ring) The motor controller, also called no commutator motor controller. 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) Effect: N = 120. 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. Brushless dc drives including power department and control department as shown in figure ( 1) : power supply provides the three-phase power supply to the motor controller, control of the transformation input power frequency in accordance with the requirements.
in the number of rotor fixed cases, 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. As early as the 19th ji was born when motor controller, the practicability is the brushless motor controller form, namely ac squirrel-cage asynchronous motor, this motor has been widely used.