Patent ID: 8627688
Filing Date: 2014-01-14
Classification: D06F

Abstract:
1. A vertical-rotation-axis washing machine comprising an outer casing; a wash assembly housed inside the casing and comprising a wash drum rotatable about an axis of rotation substantially parallel to a vertical reference axis, and an electric drive unit for rotating said wash drum about the axis of rotation; and a control system for controlling unbalance of the wash assembly; said wash assembly being structured so that as the wash drum and a load inside the wash drum rotate about the axis of rotation, the movement of a center of mass of the wash assembly has a vertical oscillatory component in a first direction substantially parallel to said vertical reference axis; said control system comprising: wherein said processing unit determines the time pattern of the amplitude of vertical oscillations of the centre of mass of said wash assembly in said first direction on the basis of the following unbalance function: where Tm(t) is the drive torque imparted by the electric drive unit to said wash drum; J is the mass moment of inertia of the wash drum and the load inside it; and α(t) is the angular acceleration α(t) imparted to the wash drum.