Magnetic Drum Balancer Control for Unbalanced Washing Loads
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Solution Overview
Problem
Washing machines experience vibration and noise due to unbalanced drum rotation during laundry cycles, which can lead to damage if not properly stabilized.
Innovation Solution
A washing machine design incorporating a balancer system with a ring-shaped channel, a mass body, and an adjustment unit that uses magnetic forces and electromagnets to offset unbalanced loads, controlled by sensors to determine the optimal position of the mass body for balancing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a balancer is provided to offset unbalanced load, then drum rotation stability is improved, but device complexity increases due to additional components
Solution Approach 1:
The mass body is made movable within the balancer housing, allowing it to dynamically adjust its position to counteract unbalanced loads. The mass body can move between a first position (when drum rotation is stable) and a second position (when unbalanced load occurs), transforming the static balancer into a dynamic system that adapts to changing conditions.
Solution Approach 2:
The system changes the position parameter of the mass body to adapt to different operational conditions. By moving the mass body between different positions within the balancer housing, the system alters the balancing characteristics to counteract unbalanced loads without requiring a completely different balancer structure.
2Speed
If electromagnets are used to control mass body position, then balancing response speed is improved, but energy consumption increases
Solution Approach 1:
The electromagnets are activated periodically or on-demand rather than continuously. The control unit detects unbalanced loads and activates the electromagnets only when needed to move the mass body to the appropriate position, thereby reducing overall energy consumption while maintaining fast response speed when balancing is required.
Solution Approach 2:
The system uses the drum's own rotation and the mass body's gravity-assisted movement to achieve balancing with minimal electromagnetic energy input. The electromagnets provide only the initial impulse or correction needed, while the system's own dynamics complete the balancing action.
3Measurement precision
If multiple sensors are used to detect unbalanced load, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The load sensor serves multiple functions: it detects unbalanced loads, determines the magnitude of the unbalanced load, and provides feedback for control. This multi-functionality allows the system to achieve precise measurement without adding separate dedicated sensors for each function, thereby reducing overall system complexity.
Solution Approach 2:
The load sensor provides continuous feedback about the drum's balancing state, allowing the control unit to make real-time adjustments to the mass body position. This feedback mechanism enables precise measurement and control using a single sensor rather than multiple independent measurement systems.
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 system effectively stabilizes drum rotation, reducing vibration and noise, and preventing potential damage by actively adjusting the mass body to counteract unbalanced loads during operation.
Implementation Method 1
The adjustment unit may include at least one electromagnet disposed around the at least one balancer housing so as to generate magnetic force in a direction offsetting attractive force applied between the at least one mass body and the at least one balancer housing.
Implementation Method 2
One of the at least one mass body and the confinement unit may include a permanent magnet, and the other one of the at least one mass body and the confinement unit may include at least one magnetic body so as to attach the at least one mass body to the at least one balancer housing through magnetic force.
Implementation Method 3
an adjustment unit to release confinement of the at least one mass body so as to allow the at least one mass body to descend due to gravity during rotation of the drum
Data Source
AI summary
A washing machine in which performance of a balancer is improved and a control method thereof. The washing machine includes at least one balancer housing provided with a ring-shaped channel, at least one mass body movably disposed in the channel, a confinement unit to confine the at least one mass body to the at least one balancer housing so as to allow the at least one mass body to be rotated under the condition that the at least one mass body is fixed to the at least one balancer housing, an adjustment unit to release confinement of the at least one mass body so as to allow the at least one mass body to descend due to gravity during rotation of the drum, and a control unit to control the adjustment unit so that unbalanced load is offset by the at least one mass body.