A Frequency And Voltage Controllable Power Source For Laboratory Use

A technique is presented to generate a low voltage, frequency controllable power source for educational laboratory use. The proposed power supply has the merits of generating a sinusoidal AC low voltage waveform with controllable frequency and voltage from a wound rotor induction machine driven by a DC motor. The generator does not require a variable external excitation power source or any automatic voltage regulator. The presented configuration has the inherent capability of protecting the load under test from short circuit. The variable frequency generator is proposed as an educational laboratory power source for experiments in energy conversion, control, and electric power quality.