Solid state adjustable-speed a-c drives offer a new era in high performance, maintenance-free, industrial drive systems. Whether applying a solid state adjustable-speed a-c drive to a new application or a retrofit to a fixed frequency drive there will be recognized unique advantages, both economically and from this standpoint of performance.

Since its’ introduction in the mid 1960’s the pulse width modulated (PWM) inverter has offered a number of significant advantages over hydraulic systems and other inverter types for low and medium frequency applications. With the advent of the fast turn-off thyristors and advances in PWM modulator techniques, the PWM now offers distinct application advantages to 200 Hz. PWM design concepts are analyzed, with a comparison of different types of inverters are discussed.

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