Patent ID: 6548977
Filing Date: 2003-04-15
Classification: G01D,H02P,Y10S

Abstract:
A control system for the continuous, non-volatile tracking of the position of a motor armature, comprising:motor armature position data acquisition and storage means, including an armature position transducer, at least one electronic data processing unit, and sampling means for causing said electronic data processing unit to intermittently access said position transducer, for defined time periods and at controlled variable frequency of access; a primary power supply circuit for delivering drive current to the motor; a battery-powered secondary circuit; and means for operatively connecting said primary power supply circuit to said data acquisition and storage means, and for connecting, automatically and only upon disruption of power in said primary power supply circuit, said secondary circuit to said data acquisition and storage means to provide a backup operating mode; said frequency of access caused by said sampling means in said back-up mode varying in a direct relationship to the speed of the motor armature, as detected by said position transducer.