Washing Machine Spin Control for Load Unbalance Redistribution
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Solution Overview
Problem
Existing methods for controlling the centrifugation process in washing machines fail to address non-uniform load and unbalance issues effectively, leading to engine overheating and reduced service life, as they either terminate the process upon detecting unbalance or lack multi-step centrifugation for uniform laundry distribution.
Innovation Solution
A method that involves multiple stages of laundry distribution and measurement to adjust the rotation speed, allowing for continuous monitoring and redistribution based on unbalance values, switching to higher speeds only when within predetermined intervals, and reverting to lower speeds or terminating the process if unbalance is not corrected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the centrifugation process is terminated upon detecting unbalance, then engine damage is prevented, but laundry drying quality deteriorates
Solution Approach 1:
The centrifugation process is divided into multiple stages: initial centrifugation at first rotating speed, intermediate redistribution phase, and final centrifugation at second rotating speed. This segmentation allows the system to detect and correct unbalance conditions during the intermediate phase rather than terminating the entire process, thus maintaining both engine safety and drying quality.
Solution Approach 2:
The method performs preliminary unbalance detection during the initial centrifugation phase before reaching high rotating speeds. By detecting unbalance conditions early and performing laundry redistribution at intermediate speeds, the system prevents severe unbalance damage to the engine while ensuring proper laundry distribution for high-quality drying in the final phase.
2Loss of time
If single-step centrifugation is used, then process time is reduced, but laundry distribution uniformity deteriorates
Solution Approach 1:
The centrifugation process is segmented into distinct phases: initial centrifugation at first rotating speed for preliminary distribution, intermediate redistribution phase for correction, and final centrifugation at second rotating speed for thorough drying. This multi-stage approach ensures uniform laundry distribution while maintaining reasonable total process time.
3Speed
If unbalance detection is performed at high rotary speed, then measurement speed is improved, but measurement accuracy deteriorates
Solution Approach 1:
Unbalance detection is performed preliminarily during the initial centrifugation phase at the first (lower) rotating speed rather than waiting until high rotating speed. This preliminary detection at lower speeds provides more accurate measurements, allowing the system to make informed decisions about whether redistribution is needed before committing to high-speed centrifugation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures high-quality centrifugation by maintaining accurate unbalance detection and redistribution, preventing engine overload and ensuring thorough laundry drying through multi-step centrifugation.
Implementation Method 1
During that period the laundry is pressed to the wall of the washing drum without possibility to fall down because of centrifugal force
Implementation Method 2
Unbalance value is checked on the basis of changes of turning speed and torque force of the engine
Implementation Method 3
turning speed of the drum is increased from zero up to 50 r/s... turning speed is increased up to 100 r/s
Data Source
AI summary
Method for controlling the centrifugation process of a washing machine, wherein during a first, a second and a third laundry distribution phases (D1, D2, D3), performing a number of unbalance value measurements (M1-M7) and comprising an unbalance value of the drum of the washing machine with predetermined unbalance values. If the current unbalance values are within predetermined intervals, the washing machine performs a spin phase (S1, S2, Smax). If the values are not within the predetermined intervals, the washing machine performs a laundry redistribution phase (R1, R2), after which a further laundry distribution phase (D1, D3) may take place.