| 摘要 |
PURPOSE:To enable to directly detect the magnetic flux of a gap without throttle ripple by providing magnetic flux sensors on the outer surface side of a stator core. CONSTITUTION:A magnetic flux sensor 111 and the second magnetic flux sensor 112 at the position of 90 deg. of an electric angle opposite to the sensor 111 are provided on the outer surface side of a stator 101, the magnetic flux amount of the gap of the vector difference between the magnetomotive force of the primary current and the magnetomotive force of the secondary current is detected, thereby detecting the magnetic flux current of the gap, andthe leakage magnetic flux of the secondary current is subtracted from the value, thereby obtaining the secondary crossing magnetic flux current. In this manner, the revolving magnetic flux of an induction machine is directly controlled. Accordingly, the temperature of a rotor is varied to alter the resistance value, and even if the actual value of the current is varied, it is always maintained in the amplitude of the exciting current of the reference by the operation of an exciting current monitor loop. |
