Disconnection detecting device for rotating electrical machine, method for detecting disconnection of rotating electrical machine

Abstract

A disconnection detecting device that can be applied to a control system of a motor-generator is provided. A disconnection detecting section judges whether logical conjunction (i.e. AND operation) of a condition that both current sensors are operating normally and a condition that the designated torque is equal to or more than a specified torque is true or not. In the event that the disconnection detecting section has determined YES, the disconnection detecting section judges whether the logical conjunction of a condition that the absolute value of the phase current is equal to or less than a specified current (>0) and a condition that the absolute value of the current change rate is equal to or less than a specified value (>0) is true or not. In the event that the disconnection detecting section has determined YES, the disconnection detecting section has determines that the disconnection has occurred.

Dependencies are inferred from the claim text.