Laundry Machine Drain Pump Speed Control to Reduce Dewatering Noise
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Solution Overview
Problem
Laundry treatment machines experience noise and reduced drainage performance due to idling of the drain pump during dewatering, caused by varying water levels and centrifugal forces, leading to inefficient drainage.
Innovation Solution
A laundry treatment machine with a main controller that dynamically controls the speed of the pump motor based on the speed of the main motor during dewatering, adjusting the pump motor's speed to prevent idling and optimize drainage performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the main motor speeds up during dewatering, then drainage performance is improved, but the pump motor idles due to centrifugal force preventing water introduction, causing noise generation
Solution Approach 1:
The patent applies dynamics by making the pump motor speed variable rather than constant. The control unit dynamically adjusts the pump motor speed based on the main motor speed, transitioning from constant speed operation to variable speed operation to prevent idling and noise during high-speed dewatering
Solution Approach 2:
The patent implements feedback control where the control unit continuously monitors the main motor speed and uses this information to adjust the pump motor speed accordingly. This closed-loop feedback mechanism ensures the pump motor operates at optimal speed to prevent idling while maintaining effective drainage
2Ease of operation
If the pump motor operates at constant speed, then simple control is maintained, but drainage performance deteriorates when water level increases during dewatering
Solution Approach 1:
The system transitions from static constant speed control to dynamic variable speed control, where the pump motor speed automatically adapts to changing operational conditions (main motor speed and water level) to optimize drainage performance while maintaining ease of operation through automated control
3Productivity
If the pump motor speed is increased to improve drainage, then drainage performance is improved, but noise increases due to pump idling
Solution Approach 1:
The patent changes the operational parameters of the pump motor from constant speed to variable speed, adjusting the speed parameter dynamically based on main motor speed and water level conditions to optimize drainage while preventing noise-causing idling
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
The solution reduces noise and improves drainage efficiency by ensuring the pump motor operates effectively, even during changes in water level, thereby minimizing drainage time and enhancing overall washing performance.
Implementation Method 1
when the main motor speeds up, part of the wash water remains in the washing tub without being drained due to a centrifugal force exerted on the inside of the washing tub
Data Source
AI summary
The present disclosure relates to a laundry treatment machine and a method for controlling the same. An increased amount of wash water during dewatering is introduced into a pump by decreasing the speed of a pump motor provided in the pump and increasing it again based on changes in the speed of the main motor during dewatering, and the wash water introduced while the speed of the pump motor is increasing is drained. Thus, the amount of noise generated during drainage may be reduced, drainage performance may be improved, and drainage time may be shortened.