Electrical news and engineering . ately excited fields fed from a three unit set. which has a 50 2,200 volt induction motordriving a 25 kw. 125 volt, direct-current constant potentialgenerator, and a 75 kw. direct-current generator supplyingthe series winding on the roll motor fields. The voltage ofthe latter is proportional to the motor armature current. The armature leads are connected through a circuitbreaker, to tlie armature leads of the generator on the fly-wheel-motor-generator set. This generator is an of the same characteristics as the main motor
Electrical news and engineering . ately excited fields fed from a three unit set. which has a 50 2,200 volt induction motordriving a 25 kw. 125 volt, direct-current constant potentialgenerator, and a 75 kw. direct-current generator supplyingthe series winding on the roll motor fields. The voltage ofthe latter is proportional to the motor armature current. The armature leads are connected through a circuitbreaker, to tlie armature leads of the generator on the fly-wheel-motor-generator set. This generator is an of the same characteristics as the main motor, andhas its fields separately excited from the 25 kw. the same shaft is a 1,600 three phase, 60 cycle, 2,200volt, slip ring induction motor, and a 60,000 lb. flywheelbuilt up of boiler plate. The synchronous speed of this setis 514 The switchboard panels are for controlling the inductionmotor on the motor-generator set. exciter and air washer,and for direct current from the two exciter generators. A cir-. Blast Furnace plant of Algoma Steel Corporation. Sault cars and The change from steam to electric drive involves thesubstitution of an equivalent for the reversing engine whichis used to drive the mill. This is sometimes done by theinstallation of a flywheel motor-generator set driving a di-rect-current motor connected to the rolls. In such installa-tions the main roll motor has to be of special construction •For certain of the information contained in this article we are in-debted to papers before a recent convention of the association of Ironand Steel Electrical Engineers; photos courtesy Algoma Steel Corporation. Marie, showing electrically operated ore bridges, orefur nace charging skip hoists cuit breaker panel is placed between the main motor and gener-ator. Control of the speed and direction of the roll motoris by means of a panel board of contactors and relays, whichoperate the fields of the motor and its generators. M
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