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When used in this style, the MG set is equivalent to an isolated variable transformer. High-frequency machines [modify] An Alexanderson alternator is a motor-driven, high-frequency generator which offers radio frequency power. In the early days of radio interaction, the high frequency carrier wave had actually to be produced mechanically using an generator with numerous poles driven at high speeds.

While electromechanical converters were regularly used for long wave transmissions in the very first three decades of the 20th century, electronic strategies were needed at greater frequencies. The Alexanderson generator was mainly changed by the vacuum tube oscillator in the 1920s. Motorgenerators used to increase ride-through [edit] Motorgenerators have even been used where the input and output currents are basically the exact same.

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The output's electrical current can be spick-and-span (noise complimentary) and will be able to ride-through brief blackouts and changing transients at the input to the MG set. This may make it possible for, for instance, the flawless cut-over from mains power to A/C power supplied by a diesel generator set. The motorgenerator set might contain a large flywheel to enhance its ride-through; however, consideration needs to be taken in this application as the motorgenerator will require a large amount of current on re-closure, if prior to the pull-out torque [] is accomplished, leading to a shut down.

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As an example, a 250 k, VA motor generator operating at 300 ampere of full load current will require 1550 ampere of in-rush present during a re-closure after 5 seconds. This example used a fixed mounted flywheel sized to result in a 12 Hz per second multitude rate. The motorgenerator was a vertical type two-bearing machine with oil-bath bearings.

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Modern usage of motorgenerators [modify] Motorgenerator sets have actually been changed by semiconductor gadgets for some functions. In  Additional Info , a popular use for MG sets was in elevators. Since precise speed control of the hoisting device was needed, the impracticality of differing the frequency to a high power AC motor suggested that the use of an MG set with a DC hoist motor was a near industry-standard service.