Design Improvement of the Premium Efficiency Induction Motor for Higher Efficiency & Cost Reduction

摘要

Motor market is moving to premium efficiency and motor manufacturers around the globe are taking strategic efforts to increase the efficiency without increasing materials and manufacturing cost. The stator winding type plays an important role in deciding the efficiency, performance & the cost of induction motor. In this paper, the solution for motor efficiency improvement and cost reduction by implementing single layer winding is discussed. An attempt is made to improve the efficiency, minimize the cost and production time of premium efficiency motor by optimizing its winding design from double layer to single layer. A prototype manufactured, validates the feasibility of the designed winding and the built model, which is suitable for efficient operation at various loading conditions. An experimental comparison of a double and single layer winding premium efficiency motor, with regard to input power, losses, efficiency, cost and production time considering the same fundamental rated operating conditions, is presented. The test results obtained from prototype ensures the considerable increase in the efficiency, reduction in losses, cost and production time. This design solution is achieved without changing the frame size and stator geometry. However, it should be noted that the single layer winding design is feasible only if it is properly designed taking into account harmonics content and layer thickness.