Patent ID: 6479956
Filing Date: 2002-11-12
Classification: H02P

Abstract:
A brushless motor controller having an information signal generation means for generating the information signal patterns corresponding to the terminal voltages of the stator coils of multiple phases in a brushless motor, a rotating position detection means for detecting the rotating position of the rotor in said brushless motor in accordance with said information signal patterns, and a power-on control unit for supplying power to said stator coils in accordance with said rotating position, wherein said controller is characterized in that it further hasan information signal pattern storage means for storing said information signal patterns, and an information signal pattern comparison means by which the first information signal pattern stored within said information signal pattern storage means, the second information signal pattern generated immediately after commutation, and the third information signal pattern generated after the elapse of the required time immediately following said commutation are compared and when said first information signal pattern and said third information signal pattern are the same and said second information signal pattern is different from said first information signal pattern and said third information signal pattern, a reflux current decay signal is generated to indicate that the reflux current has been decayed.