Solving thermal-circuit problems with computers

THE INDUCTION MOTOR DESIGNER has always had to determine the temperature level of critical points within a motor because high temperatures result in shorter motor life and excessive motor failures. The thermal circuit is one means of calculating motor temperatures that has been available to the designer for many years, but has not been used to any great extent because the time required to obtain solutions from the circuit was much too long. The rapid development of computers and computer techniques in the last five years has made the use of thermal circuits much more attractive to the motor designer.