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Effects of pulse-width-modulated supply voltage on eddy currents in the form-wound stator winding of a cage induction motor

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2 Author(s)
Islam, M.J. ; Dept. of Electr. Eng., Helsinki Univ. of Technol., Helsinki ; Arkkio, A.

The eddy currents of a form-wound multi-conductor stator winding because of the non-sinusoidal supply voltage in a cage induction motor are studied. The time and space dependence of the field, circuit variables and the motion of the rotor are modelled with the time-discretised finite-element analysis. A pulse-width-modulated voltage is used to supply the motor. The eddy-current loss distribution of the stator bars and the total eddy-current losses are studied. The radial distance of the stator bars from the air gap is re-emphasised as a design parameter because of its effect on the losses and the hot spots. The means for minimising the losses and avoiding the local hot spots are studied.

Published in:

Electric Power Applications, IET  (Volume:3 ,  Issue: 1 )