Drum Washer Ball Balancer Speed Control for Tub Oscillation
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Solution Overview
Problem
Existing drum-type washing machines with ball balancers face increased manufacturing costs and imperfect prevention of tub oscillation greater than a predetermined level due to the use of multiple races with different ball sizes and viscosities, which are not precisely calculated to manage differential rotational speeds effectively.
Innovation Solution
A method that maintains the drum's rotational speed at a predetermined level during dehydration to reduce differential rotational speed between the drum and ball, allowing the tub to pass oscillation points greater than the predetermined level by re-increasing the speed, thereby using a single race with varying ball sizes and viscosities to control tub oscillation effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If at least two races with different ball sizes and viscosities are used to prevent tub oscillation, then the occurrence probability of oscillation greater than the predetermined level is reduced, but the manufacturing cost increases
Solution Approach 1:
The invention changes the operational parameters (drum speed, pause duration) rather than structural parameters (multiple races with different balls). By controlling the drum speed to pause before reaching oscillation-prone speeds and then rapidly increasing speed to pass through the oscillation point, the system prevents tub oscillation without requiring multiple races with different ball sizes and viscosities, thereby reducing manufacturing cost while maintaining reliability
Solution Approach 2:
The invention introduces dynamic speed control with pause and rapid acceleration phases. The drum speed is dynamically adjusted to pause at a predetermined level before the oscillation point and then rapidly increased to pass through the oscillation point. This dynamic approach replaces the static structural solution of multiple races, achieving oscillation prevention through operational flexibility rather than structural complexity
2Reliability
If more races are added to further reduce the occurrence probability of oscillation greater than the predetermined level, then the reliability of oscillation prevention is improved, but the device complexity increases
Solution Approach 1:
The invention extracts the oscillation prevention function from the structural configuration (multiple races) and implements it through operational control (speed management). By taking out the need for multiple races and replacing it with a single race combined with pause and rapid acceleration control, the device complexity is reduced while maintaining or improving oscillation prevention reliability
Solution Approach 2:
The invention replaces the mechanical system of multiple races with a control system that manages drum speed. Instead of using multiple mechanical races with different ball configurations, the system uses a single race with intelligent speed control that pauses and rapidly accelerates to pass through oscillation points, substituting mechanical complexity with control logic
3Productivity
If the drum speed is rapidly increased without pausing before the oscillation point, then the dehydration efficiency is improved, but the tub oscillation greater than the predetermined level occurs
Solution Approach 1:
The invention performs preliminary action by pausing the drum at a predetermined speed level before reaching the oscillation point. This pause allows the ball to reach its balancing position and prepares the system for the upcoming rapid acceleration. By taking preliminary action to stabilize the ball position before rapid speed increase, the system prevents tub oscillation while maintaining dehydration efficiency
Solution Approach 2:
The invention uses periodic action in the form of pause-rapid increase cycles. Before each oscillation point, the drum speed is paused for a predetermined period, then rapidly increased to pass through the oscillation point. This periodic pause-and-accelerate pattern prevents oscillation while maintaining overall dehydration productivity by efficiently passing through critical speed ranges
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 method reduces tub oscillation greater than the predetermined level while lowering manufacturing costs by employing a precise calculation to manage rotational speeds, ensuring the tub does not exceed the predetermined oscillation threshold.
Implementation Method 1
balls of the ball balancer move in a predetermined direction due to a differential centrifugal force caused by the unbalanced rotation
Implementation Method 2
an rpm of a drum is maintained at a predetermined level for a predetermined period of time before the tub is subjected to the oscillation greater than the predetermined level to reduce the differential rotational speed between the drum and a ball
Data Source
AI summary
A method controls tub oscillation in a drum type washing machine by utilizing a ball balancer. The method includes maintaining an rpm of a drum in a predetermined rpm level for a predetermine period of time during a dehydration operation, thereby reducing a differential rotation speed between the drum and a ball, and re-increasing the rpm, such that the tub is not subject to the oscillation that is greater than a predetermined level. The drum type washing machine adopts a single race having different ball sizes and viscosities, so that the manufacturing cost of the washing machine is reduced. The tub is prevented from being subject to oscillation greater than a predetermined level through precise calculation.