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The paper presents a space-vector pulse width modulation (SVPWM) inverter feeding a small three-phase induction motor. The SVPWM inverter enables to feed the motor with a higher voltage with low harmonic distortions than the conventional sinusoidal PWM inverter. The voltage/frequency control method is used for open loop speed control of induction motor with a reasonable degree of accuracy. The performance of the proposed drive system is simulated. The advantages of the proposed drive system are confirmed by the simulation results.

Cycloconverters are widely used for ac-to-ac power conversion. In this paper, the historical development of cycloconverfers is given along with a review of applications. The operational features of cycloconverters are discussed. Newer forms of cycloconverters such as acac matrix converters and highfrequency ac link converters are described.

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