Multi-Tub Washing Machine Speed Synchronization to Reduce Vibration
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Solution Overview
Problem
Washing machines with multiple tubs experience excessive vibration and unbalance during operation, particularly during dehydration processes, due to differences in rotation speeds and axes, leading to inefficiencies and potential damage.
Innovation Solution
A control method and system that adjusts the rotation speeds of multiple tubs in a washing machine by using processors to synchronize and adjust the drive speeds based on reference speeds, target speeds, and operational states, including increasing or decreasing rotation speeds and altering water levels to mitigate unbalance and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple washing tubs operate simultaneously at high rotation speeds during dehydration process, then dehydration efficiency is improved, but excessive vibration and unbalance occur
Solution Approach 1:
The control system dynamically adjusts rotation speed parameters of multiple tubs based on their operational states. When one tub completes washing and enters dehydration, its rotation speed is synchronized with the other tub to maintain balance and reduce vibration, while still achieving effective dehydration through coordinated high-speed operation
Solution Approach 2:
The system implements periodic speed adjustment cycles where tub rotation speeds are modified based on operational phase. During dehydration, tubs operate at synchronized high speeds periodically, while during washing phases, speeds are adjusted to maintain balance, creating a rhythmic pattern of speed changes that achieves both efficiency and stability
2Productivity
If rotation speeds of multiple tubs are independently controlled for optimal performance, then individual tub efficiency is improved, but vibration and unbalance increase due to speed differences
Solution Approach 1:
The control system continuously monitors the operational state of each tub and uses feedback to adjust rotation speeds. When one tub finishes washing and enters dehydration, the system detects this state change and adjusts the other tub's speed to match, ensuring synchronized operation that maintains balance while preserving individual tub efficiency
Solution Approach 2:
The system implements dynamic speed control where rotation speeds are not fixed but continuously adapted based on real-time operational conditions. Each tub's speed is dynamically adjusted to match the operational phase of other tubs, allowing the system to maintain both individual efficiency and overall balance through flexible, adaptive speed management
Data Source
AI summary
A washing machine and a method for controlling the same are provided. The washing machine includes a first rotary tub, a first driver configured to rotate the first rotary tub, a second rotary tub, a second driver configured to rotate the second rotary tub, and at least one processor configured to control the first driver and the second driver in a manner that the first rotary tub and the second rotary tub rotate. If a rotation speed of the first rotary tub is equal to or higher than a first reference speed, the at least one processor controls the second driver such that a rotation speed of the second rotary tub increases to a target speed and then decreases.