LINE STARTING OF THE THREE-PHASE SQUIRREL CAGE INDUCTION MOTOR USING PARTIAL WINDING PARALLEL PATHS

摘要

The starting of the three phase induction motors using partial winding parallel paths is analysed in the paper taking into account the upper space harmonics of the air gap mmf. Using the Fourier analysis of the air gap field it is shown the best way to choose the parallel path connection, the average pitch of the coils and the number of turns/coil in order to minimise the noise during starting and to obtain satisfactory starting performance (torque and current). Examples are given for four poles, 48 slots induction motor, in order to compare different winding arrangements.