Reversing cycle of modern blooming mills

TODAY THE D-C MOTOR with rotating regulator control is the accepted modern standard blooming mill drive in the metal-processing industry. By studying a typical blooming mill with a d-c variable-speed motor drive rated at 7,000 horsepower, 40/100 rpm, 700 volts, and by comparing it with the equivalent ratings in single speed motors, the variable speed one can be justified.