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Inverters are used to convert direct current into alternating current. The input is typically from the battery;

the output can be a low voltage (26 V AC) for use in instruments, or high voltage (115 V AC single or three

phase) for driving loads such as pumps.


Older rotary inverter technology uses a DC motor to drive an AC generator,. A typical rotary inverter has a four-pole compound DC motor driving a star-wound AC generator. The outputs can be single- or three-phase; 26 V AC, or 115 V AC.

 The desired output frequency of 400 Hz is determined by the DC input voltage. Various regulation methods are employed, e.g. a trimming resistor (R v ) connected in series with the DC motor field sets the correct speed when connected to the 14 or 28 V DC supply.

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