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An a-c crane-hoist controller for a wound-rotor induction motor and an eddy-current brake is described. The brake serves as an artificial load for the motor. Emphasis is placed on the desirability of using speed-responsive excitation for the brake to cause its torque to increase so rapidly with speed that flat speed-load characteristics are obtained. A magnetic amplifier responsive to a signal voltage taken from the secondary circuit of the motor is a simple and reliable means for controlling the brake excitation.
American Institute of Electrical Engineers, Part II: Applications and Industry, Transactions of the (Volume:74 , Issue: 1 )
Date of Publication: March 1955