| 摘要 |
PURPOSE:To eliminate the influence of an error upon simplifying of a structure and upon coordinates-conversion by individually controlling the magnitude and the angle of a motor current vector by employing polar coordinates with the stator coordinates as reference. CONSTITUTION:A function generator 15 obtains a target angle value beta* of a magnetic field axis reference from the relationship of tan<-1>(i*T/i*M) on the basis of the target magnetizing current value i*M and the target torque current value i*T. The target beta* is added at the addition point 16 to the angle phi of the stator axis reference, thereby obtaining the target angle value beta* of the current vector with the stator axis as a reference. At the addition point 18, the deviation DELTAepsilon is obtained between the target value epsilon* and the actual value epsilon. An angular controller 19 produces a control output DELTAtheta so that the deviation DELTAepsilon becomes zero. At the addition point 17 it is added to the target angle value epsilon*, thereby obtaining the angle command value epsilon** of the current vector. |
