| 摘要 |
Provided are a current detection apparatus having sensor sections detecting motor currents flowing in the windings for the phases of the winding groups, a control apparatus calculating voltage instructions with respect to each winding group, based on the motor current detected by each sensor section, a voltage application apparatus applying voltage to each winding group, based on the voltage instructions, and a failure detection apparatus detecting whether or not each sensor section has failed. The control apparatus, when the failure detection apparatus has detected failure of some of the sensor sections, in accordance with the detection, calculates a voltage instruction with respect to the winding group corresponding to the failure of the sensor section, based on motor current with respect to another winding group detected by the sensor section that can normally detect current.
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