Laundry Drum Motion Patterns for Efficient, Low-Vibration Washing
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Solution Overview
Problem
Conventional laundry machines lack the ability to efficiently vary drum driving motions to optimize washing based on the type of laundry, soil level, and other factors, leading to suboptimal washing efficiency and increased washing time.
Innovation Solution
The implementation of a control method that diversifies drum driving motions, including combinations of rotation directions and speeds, to simulate hand-wash effects such as massaging, disentangling, striking, swinging, rubbing, and squeezing, using lifters and controlled motor connections to apply varying mechanical forces and movements to laundry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional laundry machines use fixed drum driving motions, then the device complexity is low, but the washing efficiency is insufficient
Solution Approach 1:
The patent implements dynamic drum driving motions by varying rotation directions (forward and reverse), rotation speeds (multiple levels), and motion patterns (tumbling, rubbing, massaging) based on detected laundry types and soil levels. The control unit dynamically adjusts motor operations to optimize washing efficiency for different laundry conditions, transforming the fixed drum motion into an adaptive, multi-mode system.
2Loss of time
If drum rotation speed is increased to reduce washing time, then the washing time is reduced, but energy consumption and noise increase
Solution Approach 1:
The patent employs periodic action by alternating between forward and reverse drum rotations at different speed levels. The control unit implements cyclic patterns of high-speed tumbling followed by lower-speed rubbing or massaging motions. This periodic variation in rotation speed and direction reduces energy consumption compared to continuous high-speed operation while maintaining effective washing action and reducing noise during low-speed phases.
3Adaptability or versatility
If diverse drum driving motions are implemented to simulate hand-wash effects, then the adaptability to different laundry types is improved, but the device complexity increases
Solution Approach 1:
The patent achieves multi-functionality by programming the control unit to select from multiple pre-defined drum motion patterns (tumbling, rubbing, massaging, striking) based on detected laundry characteristics. Rather than adding separate mechanical mechanisms for each motion type, the system uses a single motor capable of varying speed and direction to universally perform multiple washing functions, thereby improving adaptability without proportionally increasing device complexity.
4Productivity
If high rotation speeds are used continuously, then the productivity is high, but the noise and vibration generated increase
Solution Approach 1:
The control unit implements periodic alternation between high-speed tumbling motions and lower-speed rubbing or massaging motions. During high-speed phases, productivity is maximized through rapid drum rotation. During lower-speed phases, noise and vibration are reduced while maintaining washing effectiveness through friction-based rubbing actions. This periodic cycling maintains overall productivity while minimizing peak noise and vibration levels.
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 enhances washing efficiency, reduces washing time, and improves customer satisfaction by tailoring mechanical forces to specific laundry needs, while minimizing excessive energy consumption and noise/vibration.
Implementation Method 1
Movement of the drum and friction between the laundry items, wash water and wash agents, and the interior of the drum, may facilitate contaminant removal from the laundry items
Implementation Method 2
Movement of the drum and friction between the laundry items, wash water and wash agents, and the interior of the drum, may facilitate contaminant removal from the laundry items
Data Source
AI summary
A laundry machine and a control method thereof are provided in which laundering ability may be improved while also improving efficiency and noise/vibration. The laundry machine employs a plurality of drum motions by varying drum rotational speed, drum rotational direction, and drum starting and stopping point, to provide different motion of laundry items in the drum.