| 摘要 |
PURPOSE:To always maintain the most suitable control system for an induction motor by keeping a fixed torque characteristic even when the temperature of the induction motor is changed due to its operation. CONSTITUTION:The produced torque of an induction motor 3 is estimated by a produced torque estimating part 20 and is outputted to a disturbance torque estimating part 21. The estimated produced torque of the induction motor 3 and a detected value of speed from a speed detector 4 are inputted to the disturbance torque estimating part 21 to estimate the disturbance and output it to a moment of inertia identifying part 22. The disturbance torque estimation signal from the disturbance torque estimating part 21 and an approximate acceleration signal are inputted to the moment of inertial identifying part 22 to identify the moments of inertia of the induction motor 3 and a load device and to output it as a parameter to a torque component current command part 7 and the disturbance torque estimating part 21. Thereby, the control factor of a control device is set, and even when the temperature of the induction motor is changed due to its operation, the torque characteristic is kept constant. |
