Motor with rotation angle detector, rotation angle detector for motor, and method for detecting failure of rotation angle detector for motor

摘要

A rotation angle detector (100) that calculates a rotation angular velocity (ω) of the electric motor (10) based on detection results of the voltage detector (10a) and the current detector (10b); A ripple detector (RD) for detecting a ripple component (Ir) included in a current (Im) flowing through the electric motor (10), a voltage detector (10a), a current detector (10b), and a ripple detector (RD) ) And a failure detection unit (38) for detecting each failure. The failure detection unit (38) is configured such that two outputs of the voltage detection unit (10a), the current detection unit (10b), and the ripple detection unit (RD) indicate normal rotation, and the other output is normal rotation. Is continued for a predetermined period, it is determined that the remaining one is out of order.