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Design of High-efficiency Single-phase Direct-on-line Synchronous Reluctance Motors for Pump Applications

With high surrounding temperatures, the winding resistances will be increased and thus lower its operational efficiency of the motor. To meet the large application requirements and fulfill the ever-rising energy efficiency regulations for those pump equipment in metals industry, efforts have consistently focused on seeking single-phase motors that can supply relatively better performance with cheaper cost. Since the steady-state rotational speed is synchronized and no driver circuit is required, the direct-on-line synchronous reluctance motor can be one of the potential alternatives to those commonly adopted induction motors. With its inherent simple structure and comparably lower operational speed, such a challenged structural design for accomplishing the high-efficiency objectives for those pump applications will be reported in details. Along with the systematic design scheme and thermal impact analyses of the performance, the competitive high-efficiency single-phase direct-on-line synchronous reluctance motors for pump applications in various metal industry equipment can thus be offered.