| 摘要 |
PURPOSE:To improve reliability and operation rate of a control system by enabling operation continuity even when current feedback turns abnormal. CONSTITUTION:A coordinate convertor 10-1 outputs 1d, 1q by making orthogonal rotation coordinate conversion on the basis of 1U, 1W and request position theta*. Comparing operators 1-2A, 2B determines a deviation between direct axis current command 1d* and 1d* and a deviation between 1q* and 1q. Voltage generators 10-3A, 3B output the output of the comparing operators 10-2A, 2B as Vd*, Vq*. Voltage operators 10-8A, 8B output 1d*, 1q* as direct abscissa current calculated value, ordinal axis voltage calculated value according to operations. Bias adders 10-6AL, AU bias the upper and lower sides of the direct abscissa voltage calculated value to set it in a current signal limiter 10-7A, and bias adders 10-6BL, BU those of the ordinal axis voltage calculated value to set it in a current signal limiter 10-7B. A coordinate convertor 10-4 outputs by three-phase conversion with Vd* and Vq*, theta*. |
