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As the name implies, a motor-generator set utilizes an electric motor as the prime mover to drive a generator. The motor and generator can be mounted on a common shaft or they can be mechanically connected through a coupling, belt drive system or reduction gear.
In all cases, the motor requires a source of power (from whichever electrical supply service is available) and it drives the generator to produce the required electrical output power. For instance, if a single-phase supply service is the only service available at a location, the generator's output could be three-phase ac which could be used to supply power to machinery which has three-phase motors, etc.
If a site has equipment which requires only direct current the generator could be one that produces dc. That is a less common setup because a full-wave rectifier could easily be used to produce plain dc from ac, but a motor-generator set can still be used for very specialized applications which need highly accurate control of a dc motor under varying load conditions. The Ward Leonard Drive System is a specialized example of such a motor-generator set. (See the Related Link below for more information.)
Nowadays, because high-power electronic inverter units are sold to produce a three-phase service from a single-phase service, motor-generator sets are used mainly for very specialized industrial sites, for engineering development and for scientific research applications.
It should be noted that there is no need to use a motor-generator set or an inverter unit to produce single phase from three-phase because any one line of a star-connected three-phase service, along with a neutral wire connected to the central star point, can easily be used as a single-phase service.
The Related Links below give a lot more information about motor-generator sets.
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