Patent ID: 8991737
Filing Date: 2015-03-31
Classification: B65H

Abstract:
1. A method for decelerating a machine reel in a paper machine, the method comprising: detecting a break in a paper web from the machine reel; determining an inertia of the machine reel; determining continuously a rotational speed of the machine reel; determining continuously the torque required to decelerate the machine reel, on the basis of the determined inertia and the rotational speed, for the purpose of stopping the machine reel in a predefined time; decelerating the machine reel electrically in accordance with the determined torque to stop the machine reel; and using a mechanical brake to stop the machine reel when a rotation speed of the machine reel is lower than a predefined rotation speed and when the torque achieved by electrical deceleration is too low to stop the machine reel in the predefined time.