6ステップインバータ駆動誘導機系におけるシミュレーションによるねじり共振軸トルクの一考察

概要

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A torsional resonance shaft torque is produced during the starting and accelerating of an induction motor system with a 6-phase type inverter. In this paper, the shaft torque behaviour of the induction motor system, consisting of an induction motor, a shaft coupling and a load inertia, is studied by simulating the system. First, the electrical equations for the induction motor and the mechanical motion equations for the system are defined, and then the shaft torques of system are calculated by using the dynamic simulation program. A test result is given to confirm that this simulation method is satisfactory for practical use. Secondly, the resonance shaft torques caused by the pulsating torques are discussed. The resonance shaft torques caused by the pulsating torques of higher order beyond the sixth order become rather small in case the induction motor is driven by VSI. The value of maximum shaft torque increases as the ratio of the load inertia moment to the rotor inetia moment of induction motor becomes larger. Furthermore, it is shown that operating the induction motor at the tortional resonace point of the first order turns out to be dangerous. Finally, it is shown that the proper driving pattern of induction motor by CSI can decline the resonace shaft torques at the torsional resonance point of the first order.