Control device for controlling travel motor of vehicle

摘要

A control device for a travel motor mounted to a vehicle has a resolver which works as a rotation-angle sensor. The control device has a RDC which calculates a rotation-angle output value &phgr; based on rotation detection signals Sa, Sb transferred from the resolver. The control device supplies electric power to the travel motor based on the rotation angle output value &phgr;. The RDC calculates “sin(&thetas;−&phgr;)” as an error deviation &egr; based on the signals Sa and Sb and the rotation-angle output value &phgr;. The RDC calculates an angular acceleration by multiplying the error deviation &egr; with a gain (=Ka·Kb), and integrates the angular acceleration two times in order to obtain a next rotation-angle output value. A gain control part of the RDC decreases the gain when the judgment means judges that the travel motor rotates at a constant rotation speed.