Criteria for optimal design of interior permanent magnet motor series

This paper presents a general approach to the optimized design of a series of interior permanent magnet motors with the same lamination cross section. A concept of a referent and particular design has been introduced and analytical expressions which relate the principal machine parameters for the referent and particular machine have been derived. The referent design can be optimized according to a certain criterion which automatically yields the optimal design of the entire series. The particular designs are then obtained from the referent design by varying the stack length, the number of turns per coil and the number of parallel circuits. In order to demonstrate the correctness of the derived design principles the optimized design of a referent machine with IEC frame size 160 has been made by combining the finite-element method and Differential Evolution optimization algorithm from which five particular designs with power ratings ranging from 15 kW to 110 kW have been derived.