Washing Machine Agitation Pause Control for Motor Heat Dissipation
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Solution Overview
Problem
Washing machine appliances lack an effective method to determine optimal soak times during agitation operations for adequate heat dissipation without extending the total cycle time, particularly when dealing with varying loads and thermal conditions.
Innovation Solution
A method that detects the weight of articles in the basket and compares the elapsed time since the previous wash cycle to a time threshold, determining a pause duration for the agitation operation based on these factors to manage heat dissipation, including the use of a controller to activate and deactivate the motor accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor operates continuously during agitation operations, then productivity is maintained, but thermal overload occurs due to heat accumulation
Solution Approach 1:
The motor is operated in periodic cycles with alternating agitation periods and soak periods. During agitation, the motor runs to provide washing action; during soak periods, the motor stops to allow heat dissipation. This periodic operation pattern prevents thermal overload while maintaining effective washing through the agitation phases.
Solution Approach 2:
The system incorporates sensors that detect thermal conditions and load characteristics, feeding this information back to the controller. The controller adjusts the agitation-soak cycle timing based on real-time thermal feedback and load weight detection, dynamically optimizing the duty cycle to prevent overheating while maintaining productivity.
2Object-affected harmful factors
If pause duration is extended to allow heat dissipation, then thermal overload is prevented, but total cycle time increases
Solution Approach 1:
The pause duration is made dynamic rather than fixed. The controller adjusts the length of soak periods based on detected load weight and thermal conditions. Heavier loads that generate more heat receive longer pause durations, while lighter loads receive shorter pauses, optimizing the balance between heat dissipation and cycle time for each specific washing condition.
Solution Approach 2:
The system changes operational parameters (agitation intensity, pause duration, cycle frequency) based on detected conditions. By varying these parameters dynamically according to load characteristics and thermal state, the system achieves adequate heat dissipation without unnecessarily extending total cycle time.
3Productivity
If agitation intensity is increased to maintain productivity during pauses, then washing effectiveness is improved, but heat generation increases
Solution Approach 1:
The system uses periodic agitation followed by soak periods, where intensive agitation is alternated with rest periods. During agitation phases, high-intensity washing action is applied; during subsequent soak phases, the motor rests to dissipate heat. This periodic pattern allows high productivity during active phases while managing thermal accumulation through rest intervals.
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 allows for optimized heat dissipation during agitation, preventing thermal overload and ensuring efficient washing cycles by dynamically adjusting the agitation duration based on load weight and elapsed time, thereby maintaining performance without unnecessarily prolonging the wash cycle.
Implementation Method 1
the heat of the drive motor may rise... determining an optimal pause time for adequate heat dissipation
Data Source
AI summary
A method of operating a washing machine appliance is provided. The washing machine appliance includes a rotatable basket and a motor configured to drive the rotatable basket. The method includes sensing an attribute of articles in the basket. The method also includes determining a pause duration for an agitation operation based at least in part on the sensed attribute of the articles in the basket. The method further includes performing the agitation operation for a period of time. The agitation operation includes activating a motor of the washing machine appliance to agitate the articles within the basket for an agitation duration and deactivating the motor of the washing machine appliance for the pause duration. The period of time is equal to the sum of the agitation duration and the pause duration.