| 摘要 |
PROBLEM TO BE SOLVED: To make an angular velocity or output torque of an induction motor controllable stably and very responsively. SOLUTION: A gain computing element 6a is constituted in such a manner that the computing of a feedback gain H can be performed, so as to make an estimated primary current and an estimated secondary magnetic flux and equiphase component contained in a deviation signal of the estimated primary current becomes zero; the gain computing element 6a performs the calculations of feedback gain H which will occur only to a component, where the estimated primary current and the deviation of primary current is orthogonal to the secondary magnetic flux; and thus an estimated angular velocity can be obtained stably and very responsively from angular velocity estimating means 3a, so that the angular velocity can be controlled stably. |
