Method for reducing polygon-effect in the deflection zone of escalators and moving walkways, requires position-dependent control of escalator or moving walkway speed

摘要

A method for reducing the polygon-effect of a chain used in an escalator or a moving walkway, in which the a different type of revs is superimposed on the revs of the deflection wheel by directly or indirectly acting electric drive. Position-dependent control of the speed is carried out such that during drive with a mainly constant frequency of rotation at the chain belt, any speed fluctuations arising are detected and an equalization is attained so that the chain deflection wheel is driven with a non-uniform rotational rate. An Independent claim is given for a device for reducing the polygon-effect.