Old School Motor Speed Controls

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gar

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Before the days of practical inverters a number of schemes were developed around the wound rotor motor to recover the rotor output energy.

Some of these methods are discussed in Chapter 15, p 240 of Bailey and Gault. Mention was made that 5000 HP was about the largest DC motor that could be built. In 1941 a 40,000 HP motor was needed at Wright Field. P 264 describes the use of a wound rotor in a modified Kramer system to feed energy back to the llne for the Wright Field application.

40,000 HP is big. On the USS Wisconsin, BB-64, we had 4 steam turbines that combined produced 200,000 HP.

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