Method for measuring the moment of inertia of a drum of a washing machine and washing machine arranged to implement said method
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United States of America Patent
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Oct 20, 2015
Grant Date -
Dec 15, 2011
app pub date -
Jun 14, 2011
filing date -
Jun 14, 2010
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Abstract
A method for measuring the moment of inertia of a washing machine drum containing a load. The drum is set in a rotation by means of a permanent magnet synchronous electric motor taking it to a first angular spin velocity. The method includes identifying a synchronization point in a periodic signal indicative of the torque provided by the synchronous electric motor at the first angular velocity. An acceleration transient of said drum with constant electromotive torque is provided by the synchronous electric motor. The method further includes interrupting the acceleration transient upon reaching a second angular velocity, acquiring the acceleration transient time duration, and processing an indirect measurement of the moment of inertia of the drum starting from a value of the torque yielded to the drum during the acceleration transient, from the transient time duration value, and from the variation of the angular velocity in the transient.
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