| 摘要 |
PURPOSE:To obtain a constant output operation without increasing the rated power of a motor and an inverter without causing torque shock. CONSTITUTION:Windings of an induction motor 1 are constituted with three phases and 6 leader terminals, mutual output phases are equallized in the operation below low speed region in constant output range when controlling two inverters 2 and 3 by a controller 4 and, in high speed region, 1:2 pole-change is provided for the induction motor by the operation of inverting mutual phases by 180 degrees. By doing this, the maximum torque characteristics of the induction motor are increased in the high speed region and the shortage of torque in high speed region is prevented without increasing the skeleton of the induction motor. Also, equal output capcity obtained by dividing the conventional rated power is provided for both the inverters. |
