Analysis and performance of a novel two-phase drive for fan and water-pumping applications

The authors describe a novel form of drive, comprising a two-phase induction motor fed by a two-phase inverter, for use in heating, ventilating, demisting, engine-cooling, and water-pumping applications in public service vehicles and passenger cars. A theoretical analysis of the arrangement is presented and a comparison is made between a number of predicted and experimental characteristics for two practical designs. One of these is a fan drive for engine-compartment ventilation and the other a motor-pump drive for a water-cooling system. In both cases, an acceptable range of speed control is achieved (i.e. ±10% of the normal full-load speed of 3300 r/min.), and an accurate prediction of the performance is provided