When the induction motor is used as a control motor, the braking-torque performance is a special important matter. In this paper, braking-torque characteristics under various exciting conditions are analyzed by the use of equivalent circuit parameters. Exciting conditions can be divided into three components: (1) DC excitation, (2) fundamental wave excitation, (3) harmonic wave excitation. The each component of the braking-torque can be calculated respectively, and the total braking-torque can be obtained by superpose them.
Analytical and experimental results on the 2-phase and 3-phase induction motors are obtained to check the accuracy of the calculating method. It can be said that this calculating method can be expected to give sufficient accurate results from the above comparison.
