| 摘要 |
PURPOSE:To calculate a load torque accurately from a load current applied to a motor. CONSTITUTION:A speed detector 3 which generates a speed feedback, a current detector 4 which detects a current applied to a motor 2 and a subtractor 6 which subtracts acceleration according to the output of a differentiator 5 which generates an acceleration by differentiating the speed feedback signal and the current detection signal are provided. |
