Patent ID: 6153992
Filing Date: 2000-11-28
Classification: B66C

Abstract:
A method for braking a running gear adapted for hoists and driven by an electric motor through a self-locking worm gear, with the motor having a motor operating voltage, said method comprising the steps of:determining a start-up rate during a start-up phase of the electric motor from an increase of a motor torque as a function of time; anddecreasing the motor torque as a function of time during a braking phase of the electric motor at a slower rate than the start-up rate to brake the running gear;forming a voltage braking rate from a normalized start-up rate by multiplying the normalized start-up rate by a stationary motor operating voltage; anddecreasing the motor operating voltage as a function of time during the braking phase of the electric motor at a slower rate than the voltage braking rate.