| 摘要 |
<p>A laundry machine includes a drum (11) supported at at least two spaced apart support locations for rotation about a rotation axis (19). A set of sensors collectively provide:
output from which the force component of the supporting force on parallel axes at the two spaced apart support locations can be derived,
output from which the acceleration component of acceleration of the two spaced apart support locations on the parallel axescan be derived,
output from which the angular velocity of said drum rotation axis about an axis through its centre of mass, perpendicular to its rotation axis and parallel to the force component axes can be derived, and
output from which the mass of the rotating drum and/or laundry load, and the axial location (along the spin axis) of the centre of this mass, can be continuously derived.
A balance correction system (80-85) is able to apply a variable amount of a balance correction mass at a selectable angular location of the drum at at least two spaced apart locations along the drum rotation axis (19).
A controller (51) receives outputs of the sensors, and is programmed to continuously calculate balance corrections to apply, the calculation accounting for:
a) the effect of acceleration of the force measurement locations on the measured forces,
b) the effect conservation of angular momentum has on the measured forces due to angular velocity of the drum rotation axis about an axis through its centre of mass, perpendicular to its spin axis and parallel to the force sensor axis, and
c) the effect the axial location of the centre of mass of the rotating drum/load has on the effects in a) and b).</p> |
