Patent ID: 7375488
Filing Date: 2008-05-20
Classification: H02P

Abstract:
1. A system for controlling the speed of a brushless repulsion motor having a stator and a rotating armature with a series of switches mounted on a printed circuit board on the rotating armature for shorting circumferentially spaced armature coils, the system comprising: LED signaling means and a plurality of rotating detectors for activating and deactivating the switches; first optical sensing means for sensing the speed of the rotating armature and generating a speed feedback signal; generating means on the motor for generating a speed command signal; an error calculator on the motor for comparing the speed feedback and speed command signals and generating an error signal; an LED controller on the motor for controlling the LED signaling means based on the error signal, wherein the LED controller is operative to adjust the LED signaling means in the positive or negative torque sector to correct the speed of the rotating armature; and second optical sensing means for sensing the position of the rotating armature.