Control-motor system

摘要

An objective is to detect a resolver malfunction without fail, using a low-cost resolver having the small number of the poles, and a control-motor system having advantage in small sizing and high-power outputting. In the control-motor system, the system for driving a 2m-pole motor based on a rotor rotation angle theta detected by a 2n-pole resolver, where m and n being counting numbers, is characterized in that: the sum of the square of a signal modulated by sin theta and the square of a signal modulated by cos theta in the resolver in which an excitation signal generated in said system is modulated by sin theta and cos theta in response to the rotor rotation angle theta of the resolver is compared to a predetermined malfunction threshold value, so that malfunction determination related to the resolver is performed, and also, given that the sum is a² when the resolver is recognized to be in normal operation, the malfunction determination threshold value is made to be not smaller than {axcos((pi/2)/(m/n))}².