In recent years, three-phase small induction motors fed by inverter have been widely employed in industrial machines, home appliances, office automation equipments, etc as a drive device. Howevex the inverter generates a vibration, a noise, a heating, etc in such induction motor. The three-phase small induction motors are required to have both a large average torque and a small alternating torque.
Previously, we have derived the practical equations to calculate the generated torque [6, 7].
In this paper, we research a new design strategy for a three-phase small induction motor fed by a six-stepped wave voltage-source inverter. Our new strategy is based on the equivalent circuit parameter approach.
At first, by using the practical operating characteristic equations, we have shown the relationship among the equivalent circuit parameters and the operating characteristics. In other words, the equivalent circuit parameters have some effects on the various operating characteristics. Simulations have demonstrated one of the guidelines for the optimum design.
Secondly, in order to verify the validity of our new strategy, a three-phase small induction motor having optimum equivalent circuit parameters has been compared with previous three-phase small induction motors.
As a result, we have clarified that our new strategy is capable of the optimum design of the three-phase small induction motors fed by the six-stepped wave voltage-source inverter for practical use.
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