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Airplane radio modulator system from the Second World War, showing a dynamotor (the black cylinder) which transforms the aircraft's 2428 V DC to 500 V DC for the transmitter.  More Discussion Posted Here  of Military Air travel A motorgenerator (an MG set) is a device for transforming electrical power to another kind. Motorgenerator sets are used to convert frequency, voltage, or stage of power.

Large motorgenerators were commonly used to convert industrial quantities of power while smaller sized motorgenerators (such as the one displayed in the photo) were utilized to transform battery power to greater DC voltages. While a motorgenerator set may consist of distinct motor and generator machines coupled together, a single system dynamotor (for dynamomotor) has the motor coils and the generator coils wound around a single rotor; both the motor and generator for that reason share the exact same outer field coils or magnets.

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The whole rotor and shaft assembly is smaller sized, lighter, and more affordable than a pair of devices, and does not need exposed drive shafts. Low-powered consumer devices such as vacuum tube automobile radio receivers did not utilize expensive, loud and bulky motorgenerators. Instead, they utilized an inverter circuit consisting of a vibrator (a self-exciting relay) and a transformer to produce the greater voltages required for the vacuum tubes from the automobile's 6 or 12 V battery.

The motor runs on the electrical input current while the generator produces the electrical output current, with power flowing between the two devices as a mechanical torque; this offers electrical seclusion and some buffering of the power in between the 2 electrical systems. One use is to remove spikes and variations in "filthy power" (power conditioning) or to offer phase matching between different electrical systems.

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For example, tokamak combination devices impose large peak loads, but relatively low typical loads, on the electrical grid. The DIII-D tokamak at General Atomics, the Princeton Big Torus (PLT) at the Princeton Plasma Physics Lab, and the Nimrod synchrotron at the Rutherford Appleton Laboratory each used large flywheels on several motorgenerator rigs to level the load troubled the electrical system: the motor side gradually sped up a large flywheel to store energy, which was taken in quickly during a combination experiment as the generator side functioned as a brake on the flywheel.