| 摘要 |
<P>PROBLEM TO BE SOLVED: To specify a failed current sensor and to constitute a system superior in maintenance performance, in current sensors that detects a three-phase AC current of an inverter for a motor. <P>SOLUTION: This control device of the inverter for the motor is characterized by comprising: the current sensor that detects a current of a motor winding arranged at each phase: an adder that operates the sum of the detected values of the current sensor; a determination means that determines whether an output value of the adder is zero or not; a ripple calculation means that calculates the ripple of an input current fed to the inverter from a DC power supply; a failure detection means for detecting that the one-phase current sensor among three phases is failed when the output value of the adder determined by the determination means is not zero, in the case that the ripple calculated by the ripple calculation means does not exceed a preset value. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
