| 摘要 |
A first restrict value calculating unit obtains a first restrict value Im 1 on the basis of the integration value (Id<SUP>2</SUP>+Iq<SUP>2</SUP>) of a d-axis current detection value and a q-axis current detection value. A second restrict value calculator 50 calculates a second restrict value Im 2 on the basis of the maximum value of the integration values of the squares IU<SUP>2</SUP>, Iv<SUP>2</SUP>, and Iw<SUP>2 </SUP>of 3-phase current detection values. A target current value It calculated by a target current calculating unit 21 is restricted by so that a current value limiter so as to be not greater than the first restrict value Im 1 and the second restrict value Im 2 . By using the two restrict value restricting the motor driving current, it is possible to control properly the motor driving current in accordance with a general driving condition and various steering conditions.
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