Patent ID: 6127820
Filing Date: 2000-10-03
Classification: G01P,H02P

Abstract:
A process for determining the speed of a direct current motor having an operating state and having motor data that influence the speed and depend on the operating state, comprising the steps of:(a) measuring parameters indicative of the operating state of the motor, the measured parameters including the temperature the motor; and(b) determining, from the parameters measured in step (a), motor data that are compensated for the operating state of the motor, the speed of the motor being calculated from the compensated motor data,wherein the motor data include the ohmic resistance (R.sub.A) of the armature of the motor, the induced armature voltage (U.sub.iQ), and the brush voltage effect (R.sub.Bu), andwherein the temperature dependence of the induced armature voltage (U.sub.iQ) and the ohmic resistance (R.sub.A) of the armature as well as the brush voltage effect (R.sub.Bu) of the motor are compensated in step (b).