Performance analysis of induction motors for driving coke transfer cars of a coke oven plant in a practical iron-making factory

This paper investigates the operating characteristics and field measurement results of four 28-kW induction motors (IMs) that are employed for driving coke transfer cars of a coke oven plant in a practical iron-making company in Taiwan. Both nameplate data and filed measured responses of the studied IMs under various operating conditions are employed to obtain the parameters of the studied IMs. This paper discusses and compares the measured output responses of the four IMs driven by four independent small frequency converters and the ones of four parallel-operated IMs driven by a large frequency converter. According to the comparative field measured results under both startup and steady-state conditions, it can be concluded that the control scheme of using a larger-capacity frequency converter to drive four parallel-operated IMs has several advantages over the original control method of employing four identical IMs driven by four independent frequency converters.