Washing Drum Speed Control for Laundry Satellizing Balance
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Solution Overview
Problem
Laundry treating appliances, such as washing machines, often operate at fixed drum speeds regardless of laundry characteristics, leading to inefficiencies in treating cycles, particularly in distributing and balancing laundry loads, which can result in imbalances and suboptimal treatment outcomes.
Innovation Solution
A method and apparatus that determine the amount of laundry using sensors, set a satellizing speed range based on the load, and adjust the drum speed to ensure the laundry satellizes correctly, altering cycle execution if the determined speed is outside the set range to maintain optimal treatment conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the drum rotates at fixed speeds for a given cycle, then the cycle execution is simple and consistent, but the laundry distribution and balancing are suboptimal
Solution Approach 1:
The patent implements dynamic speed adjustment during the spin cycle by detecting satellizing conditions and modifying drum speed in real-time. The controller accelerates the drum through a satellizing speed range and detects when laundry items satellize, then adjusts speed accordingly. This dynamic approach replaces fixed speed operation, optimizing laundry distribution while maintaining manageable cycle execution through automated control.
2Productivity
If the drum speed is adjusted based on laundry characteristics, then the laundry distribution improves, but the control system complexity increases
Solution Approach 1:
The patent employs feedback control by monitoring drum speed, detecting satellizing events, and comparing detected satellizing speed against expected ranges. The controller receives feedback from speed sensors and laundry position detection, then adjusts motor control accordingly. This feedback mechanism enables intelligent speed adjustment without requiring overly complex control logic, as the system responds to observable satellizing behavior.
Solution Approach 2:
The system utilizes the laundry itself as a sensor by detecting satellizing behavior - when laundry items naturally satellize at appropriate speeds, this self-generated signal provides information about load characteristics. The controller leverages this self-service information from the laundry's own physical response to determine optimal speed adjustments, reducing the need for external sensing complexity.
3Productivity
If the drum speed is increased to satellize laundry, then the laundry distribution improves, but energy consumption increases
Solution Approach 1:
The patent applies partial action by accelerating the drum only through the necessary satellizing speed range rather than maintaining continuously high speeds. The controller detects when satellizing occurs and adjusts speed to the minimum required level for effective laundry distribution. This approach provides sufficient redistributing action without excessive energy consumption, as the high-speed satellizing phase is limited to what is actually needed for load balancing.
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 efficient distribution and treatment of laundry by adjusting drum speed to match the laundry load, reducing imbalances and enhancing the effectiveness of washing cycles, allowing for better laundry redistribution and treatment outcomes.
Implementation Method 1
accelerating the drum through a satellizing speed for the laundry, determining the speed at which the laundry satellizes
Data Source
AI summary
A laundry treating appliance for treating a laundry load according to at least one cycle of operation and a method of operating a laundry treating appliance to determine a speed at which the laundry satellizes, comparing the same to a given amount or range, and altering execution of the at least one cycle of operation based on comparison such that the laundry treating appliance may be operated in an effective and efficient manner.