Washing Machine Variable RPM Control for Consistent Mechanical Force
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Solution Overview
Problem
Existing washing machines face challenges in accurately detecting the weight of laundry due to physical and electrical influences, leading to inconsistent mechanical force application and degraded washing performance, especially when moisture absorption changes the weight of laundry.
Innovation Solution
A control method for a washing machine that adjusts the washing RPM by accelerating and decelerating the drum in a variable washing profile, allowing the cycle and size of the RPM to change, thereby maximizing mechanical force application regardless of laundry amount or weight changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed washing RPM is used, then the control system is simple, but the mechanical force applied to laundry varies with laundry weight leading to degraded washing performance
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed washing RPM to a variable washing RPM that changes according to detected laundry weight. The control unit adjusts the motor's rotational speed dynamically during the washing cycle, allowing the drum to rotate at different speeds based on the actual load conditions, thereby maintaining consistent mechanical force and washing performance across varying laundry weights.
Solution Approach 2:
The patent implements parameter changes by modifying the washing RPM parameter based on detected laundry weight. The control unit receives weight information from the detection unit and adjusts the motor's rotational speed parameter accordingly, changing the operational parameters to optimize washing performance for different load conditions while maintaining system simplicity.
2Reliability
If laundry weight is detected to adjust washing RPM, then washing performance can be optimized, but weight detection errors occur due to physical and electrical influences
Solution Approach 1:
The patent implements feedback by using a detection unit to continuously monitor laundry weight during the washing cycle and feeding this information back to the control unit. The control unit then adjusts the washing RPM based on this feedback, creating a closed-loop control system that compensates for weight detection errors and maintains optimal washing performance despite measurement inaccuracies.
Solution Approach 2:
The patent applies preliminary action by performing an initial weight detection before the washing cycle begins and using this preliminary information to set the initial washing RPM. The system also performs intermediate weight detections during the cycle and adjusts RPM accordingly, preparing the washing parameters in advance based on detected conditions.
3Force
If washing RPM is adjusted according to laundry weight, then mechanical force is maximized, but the control process becomes complex
Solution Approach 1:
The patent applies parameter changes by implementing a control algorithm that adjusts the washing RPM parameter based on detected laundry weight. The control unit uses a predetermined relationship between weight and optimal RPM to modify the rotational speed parameter, maximizing mechanical force through parameter adjustment while maintaining relatively simple control logic based on pre-established weight-RPM correlations.
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 method ensures consistent and improved washing performance by effectively infiltrating water into the laundry, enhancing the visibility of washing operations and maintaining optimal mechanical force across varying laundry weights.
Implementation Method 1
a motor configured to generate a driving force for rotating the drum... dirt is removed from the laundry inside the drum using a mechanical force (head drop behavior) with which the laundry therein is lifted and dropped along an inner wall of the drum
Implementation Method 2
The motor rotates the drum in forward and reverse directions at a predetermined washing rotations-per-minute (RPM)... the cycle and size of a washing RPM are variable... maximizing a washing mechanical force regardless of the amount of laundry or a change in the weight of the laundry
Data Source
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AI summary
There is proposed a washing machine and a control thereof capable of maximizing a mechanical force regardless of the amount and weight of laundry. By using a washing profile in which the cycle and size of a washing RPM are variable, a washing mechanical force can be maximized regardless of the amount of laundry or a change in the weight of the laundry due to moisture absorption of the laundry. In addition, the head drop behavior of the laundry can be diversified through the washing profile in which the cycle and size of the washing RPM are variable, and in this way, by allowing water (washing water) to be effectively infiltrated into the laundry, the washing performance can be improved. In addition, by continuously showing various washing operations (rubbing, tapping, centrifugal rotation, or the like), an effect of enhancing the visibility of washing can be obtained.