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Radar System Engineering

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SEC. 146] SPEED REGULATORS 577<br />

having the regulating field, removal of the regulator from the circuit<br />

kills the alternator voltage.<br />

In order to get good results by this method, the motor field must<br />

operate below saturation; this adds weight to the magnetic circuit.<br />

Tuned Circuit C’ontrol.-An interesting method of speed control has<br />

been used by the Holtzer-Cabot Electric Company in their MG-153<br />

inverter, Fig. 14.19. The reactor and condenser connected in series<br />

with the rectifier which energizes the regulating field are designed to<br />

resonate at a frequency well above the rated frequency of the alternator<br />

(in this case, 400 cps). The circuit therefore operates on the lowfrequency<br />

side of the resonance curve; any change in speed will alter the<br />

reactance of the circuit and thus vary the field current in the correct<br />

direction to provide speed regulation. Should the motor attain a speed<br />

motor-alternator with Holtzer-Cabot speed control.<br />

.- —.

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