Patent ID: 7190134
Filing Date: 2007-03-13
Classification: H02P

Abstract:
1. A torsional vibration suppressing control method in an electric motor speed control system constituted by a mechanism for transmitting a driving torque from an electric motor to a load through a driving shaft which is provided on the load side of the electric motor and has a low torsional rigidity, and a control device for feeding back an electric motor mean speed N MAVG obtained by a calculation for a mean value every constant cycle for an electric motor speed detection signal detected by a speed detector for a speed command N REF and calculating a deviation signal, and controlling a current of the electric motor in order to have an electric motor torque in accordance with a torque command signal T RFA obtained by amplifying the deviation signal by means of a speed controller having a proportional gain and an integrator or only the proportional gain, wherein a signal obtained by multiplying a signal acquired by differentiating the electric motor mean speed signal N the inertia controller multiplies the electric motor acceleration torque T