| 摘要 |
PROBLEM TO BE SOLVED: To prevent an electric motor speed from excessively increasing, even when a torque command value of an electric motor operated by vector control is not conformed to torque of a load driven by this electric motor. SOLUTION: A torque command correction value is calculated by a first or second torque command correction value arithmetic circuit 40 from a proportional control or proportional plus integral control result of a deviation between a speed detection value and a speed limit value of an electric motor, and a torque command value τ* set in a torque command setter 9 is corrected by this arithmetic result. Or a torque current command correction value is calculated by a first or second torque current command correction value arithmetic circuit from a proportional control, or proportional plus integral control result of a deviation between a speed detection value and a speed limit value of the electric motor, and a torque current command value set in a torque current command setter is corrected by this arithmetic result. |
