Laundry treatment machine and method for controlling the same
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Solution Overview
Problem
Laundry treatment machines experience noise issues during drainage due to the start-up and repeated on/off operations of the drain pump, which affect drainage performance and increase noise levels.
Innovation Solution
A laundry treatment machine with a main controller that operates the pump motor in distinct speed periods, slowing it down to a lower speed when the main motor's speed decreases and water level decreases, and speeding it up when the water level increases, ensuring continuous operation without stopping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drain pump operates at high speed continuously, then drainage performance is improved, but noise increases due to air introduction and motor idling
Solution Approach 1:
The patent applies dynamics by varying the pump motor speed according to different operational phases and water levels. The pump operates at high speed during initial drainage to maximize productivity, then transitions to low speed when water level decreases to eliminate noise from air introduction and motor idling, thus resolving the contradiction between drainage performance and noise generation.
Solution Approach 2:
The patent implements periodic action through multi-phase speed control: first high-speed operation for rapid drainage, then low-speed operation for noise reduction, and finally stop operation when drainage is complete. This periodic variation in operational speed allows the system to achieve both high drainage performance and low noise levels at different time intervals.
2Loss of energy
If the drain pump turns on and off repeatedly based on water level, then energy consumption is reduced, but noise increases due to repeated start-up operations
Solution Approach 1:
The patent applies preliminary action by maintaining the pump motor at a low speed operation state instead of completely stopping it when water level decreases. This preliminary low-speed state allows the pump to be ready for immediate operation when water level rises again, avoiding repeated high-noise start-up operations while still reducing energy consumption compared to continuous high-speed operation.
Solution Approach 2:
The patent uses dynamics by transitioning the pump motor between low-speed and stop states based on water level detection. When water level is high, the pump operates at low speed; when water level is low, the pump stops. This dynamic state change reduces energy consumption while minimizing noise by avoiding repeated high-speed start-ups.
3Loss of energy
If the pump motor is stopped during drainage, then energy consumption is reduced, but drainage time increases due to repeated start-up operations
Solution Approach 1:
The patent applies preliminary action by keeping the pump motor in a low-speed operational state rather than completely stopping it during drainage. This preliminary state maintains the motor's readiness to pump water, allowing rapid resumption of full drainage operation when water level increases, thus reducing overall drainage time while still achieving energy savings compared to continuous high-speed operation.
Solution Approach 2:
The patent implements continuity of useful action by maintaining the pump motor in a low-speed operational state throughout the drainage process rather than completely stopping and restarting it. This continuous low-speed operation ensures the motor remains engaged and ready, eliminating idle time and repeated start-up delays, thus maintaining efficient drainage throughput while reducing energy consumption.
Data Source
AI summary
The present disclosure relates to a laundry treatment machine. A pump motor provided in a drain pump is controlled to correspond to the operation of the main motor and the water level, so that the pump motor slows down based on the speed of rotation of the main motor and the water level and keeps operating at low speed. Therefore, the pump motor is able to keep operating without stopping operation, and the amount of noise caused by the start-up of the motor is reduced, and the time taken to align the rotor of the motor in position is reduced, thereby reducing drainage time and improving the drainage performance of the drain pump.