Abstract :
For various classes of work — for cranes, hoists, rolling mills, etc. — it is generally required that means be provided for stopping the motor quickly. When the electric power supply to the motor is taken off, the motor speed will gradually slow down, due to the friction load; however, the time required to bring the motor to a standstill by this method is generally too long, and other means have to be applied, stopping by brakes mechanically, electrically, or hand-operated, electric braking by alternating or direct current, etc.
