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Airplane radio modulator system from the 2nd World War, showing a dynamotor (the black cylinder) which transforms the aircraft's 2428 V DC to 500 V DC for the transmitter. Dbendorf Museum of Military Air travel A motorgenerator (an MG set) is a gadget for transforming electrical power to another type.  View Details  are used to transform frequency, voltage, or phase of power.

Big motorgenerators were extensively used to convert commercial quantities of power while smaller motorgenerators (such as the one revealed in the photo) were utilized to convert battery power to greater DC voltages. While a motorgenerator set may include unique motor and generator machines combined 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 therefore share the very same external field coils or magnets.

DC motor vs AC generator - Evan's Space

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The whole rotor and shaft assembly is smaller, lighter, and cheaper than a pair of machines, and does not require exposed drive shafts. Low-powered customer gadgets such as vacuum tube automobile radio receivers did not utilize costly, loud and large motorgenerators. Rather, they utilized an inverter circuit consisting of a vibrator (a self-exciting relay) and a transformer to produce the higher voltages needed for the vacuum tubes from the lorry's 6 or 12 V battery.

The motor runs on the electrical input current while the generator develops the electrical output present, with power streaming between the two devices as a mechanical torque; this provides electrical isolation and some buffering of the power between the two electrical systems. One usage is to eliminate spikes and variations in "filthy power" (power conditioning) or to provide stage matching between various electrical systems.

11.2 Electrical machines - generators and motors - Electrodynamics -  Siyavula

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For example, tokamak fusion gadgets impose large peak loads, but relatively low average 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 big flywheels on several motorgenerator rigs to level the load troubled the electrical system: the motor side slowly sped up a big flywheel to save energy, which was taken in rapidly during a combination experiment as the generator side functioned as a brake on the flywheel.