Starting of single-phase motors

摘要

A simple rotor position transducer for an electronically commutated electric motor has a vane mounted to rotate with the rotor and a pair of sensors. One sensor has an output coincident with positions of zero torque. The other sensor produces signals slightly in advance. Overlapping portions of the signals denote regions of different levels of torque. The second sensor output can also be used in high-speed, single-pulse control of the motor.