TIDUCL0 January 2017
Compared to their brushed motor counterpart, permanent magnet brushless motors are gaining importance because of their high efficiency, high torque to weight ratio, low maintenance, high reliability, low rotor inertia, low noise, and so on. A brushless permanent magnet synchronous motor (PMSM) has a wound stator and a permanent magnet rotor assembly. These motors generally use internal or external devices to sense rotor position. The sensing devices provide position information for electronically switching the stator windings in the proper sequence to maintain rotation of the magnet assembly. The electronic drive is required to control the stator currents in a brushless permanent magnet motor. The electronic drive consists of:
For more details about trapezoidal control, see the application report Sensorless Trapezoidal Control of BLDC Motors (SPRABQ7).