Drum type washing machine

Abstract

The moment of inertia and the eccentric load are measured in rotating a drum at 100 rpm, and the decision critical value is decided according to the moment of inertia and the eccentric load(S31-S42). The motor is controlled to accelerate within the range of 140 to 220 rpm less than the resonance point of about 250 rpm, and the value is measured according to fluctuation of acceleration(S43-S47). The large vibration is decided, and the emergency stop is performed in case of the value from the acceleration fluctuation to be over the critical value(S48). Acceleration is changed by adding uneven load to the bearing in rotating while reducing eccentric load, and the critical value is decided accurately according to the moment of inertia and the eccentric load.

Description

technical field [0001] The invention relates to a drum type washing machine, and more specifically, mainly relates to a technology capable of suppressing or reducing vibration generated during centrifugal dehydration. Background technique [0002] In a drum type washing machine, a substantially cylindrical drum with a plurality of dehydration holes around it rotates at a high speed centered on a horizontal or inclined axis, so that the washed water contained in the drum is The water in the laundry is thrown out to dehydrate. When the centrifugal dehydration is performed in this way, the laundry is arranged on the inner side of the drum circumferential surface with an offset, so the mass around the shaft is unbalanced (ie, eccentric load), and when the rotation speed of the drum rises, its vibration is large, accompanied by this. , The outer tank with the roller inside vibrates and contacts the inner side of the outer box or makes the outer box itself vibrate, which constitu...

AI Technical Summary

Problems solved by technology

[0013] However, when considering a more complicated case (a case with a high frequency of actual occurrence), although the eccentric load is almost zero when viewed in the drum circumferential direction, two aggregated pieces of laundry are placed away from the shaft direction and sandwich the shaft. , which produces a very large vibration

This situation has never been imagined before, and there is a possibility of abnormal vibration or abnormal noise

[0014] In addition, in addition to the vibration caused by the special distribution of the laundry in the axial direction, in fact, various distribution methods of the laundry sometimes cause vibrations on the drum, the outer tank and the outer box. The previous eccentric load detection method may not be able to Accurate detection, or large vibrations have occurred before detection

[0015] In addition, if it is necessary to detect the occurrence of large vibration without omission, the time required for this detection will be longer, and the dehydration acceleration time for switching to high-speed dehydration operation will be consumed, and the two are contradictory.

Images