Discrete Design Optimization of ۳-Phase Induction Motors Using Standard Lamination

۳-phase squirrel-cage type induction motors are very widely used as industrial drives. They have outpaced their predecessor the d.c. motors for various advantages they have. Slip-ring or phase-wound types are used as adjustable-speed drives. Cage-type motors are also being used as adjustable-speed drives after the advent of power-electronic devices. The single-phase motors are also widely used for running small machineries and domestic appliances. The total expenses for these motors constitute the largest fraction of the total investment at the consumer end. Therefore, they must be designed cost-optimally. At the same time, they must conform to the standards specified by the customer or the statutory regulations imposed by the authorities. We can expect to arrive at a feasible but not cost-optimal solution if the design is made according to textbook guidelines. Standard stampings are more cost-effective for job work because they do not require the purchase of expensive dies. Using commercially available standard stampings, the paper presents an iterative procedure for obtaining the most cost-effective solution under typical design constraints. On this foundation, a case study was developed.