Abstract

This paper presents a novel steady-state and transient performance analysis of the universal motors with appropriate turns ratio of lead coils to lag coils in an armature. Time-stepping finite-element analysis has been used to successfully predict the brush-to-bar voltage drop of the universal motor. The computed armature current and speed have been validated by tests in a 500-W universal motor. The turns ratio of lead coils to lag coils minimizing the brush-to-bar voltage drop has been determined from the simulation results.

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