Washing Machine Rotator Motion Sequencing for Lower Driving Load
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Solution Overview
Problem
Laundry treating apparatuses face challenges in reducing the moment of inertia acting on rotators during rotation, leading to increased driving loads and operation failures, particularly when large amounts of laundry are washed, causing tangling and difficulty in controlling the driver.
Innovation Solution
The apparatus incorporates a rotator with an inclined blade that performs distribution motions before washing motions to create a space between the laundry and the rotator, utilizing water flow characteristics to achieve efficient rotation and reduce the driving load by controlling the rotation angle and speed, allowing for easy control of the driver and enhanced washing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotator rotates during washing process, then water flow is formed to improve washing efficiency, but the laundry and rotator become tangled causing operation failure
Solution Approach 1:
The patent applies preliminary action by performing a distribution motion before the washing motion. The rotator first rotates at a low speed to distribute the laundry evenly on the drum bottom, creating space between the laundry and rotator. This preliminary distribution prevents tangling during subsequent high-speed washing rotation, ensuring both washing efficiency and operation reliability
2Productivity
If the rotator rotates at high speed to form water flow, then washing efficiency is improved, but the moment of inertia increases causing difficulty in controlling the driver
Solution Approach 1:
The patent applies dynamics by using variable speed control of the rotator. The rotator operates at different speeds for different functions: low speed for distribution motion to minimize moment of inertia and ease driver control, and high speed for washing motion to form effective water flow. This dynamic speed adjustment resolves the contradiction between washing efficiency and driver controllability
3Productivity
If the rotator rotates to form water flow, then washing effect is improved, but the driving load increases causing operation failure
Solution Approach 1:
The patent applies preliminary action by performing distribution motion before washing motion. The low-speed distribution phase creates space between laundry and rotator, reducing the load on the driver. This preliminary action prevents excessive driving load during subsequent high-speed washing operation, ensuring both washing effect and preventing operation failure
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 approach reduces the moment of inertia and driving load, preventing operation failures and improving washing efficiency by optimizing the rotation strategy of the rotator, enabling effective three-dimensional water flow formation and enhanced laundry washing performance.
Implementation Method 1
the rotator may include an inclined blade, and various washing motions of the rotator may be implemented by placing a deviation in amounts of rotation of rotation in one direction and rotation in the other direction using water flow characteristics based on an inclination of the blade
Data Source
AI summary
A laundry treating apparatus include a tub, a water supply, a drum, and a rotator including a bottom portion positioned on a bottom surface of the drum, and a pillar protruding upward from the bottom portion, and a blade disposed on an outer circumferential surface of the pillar. The controller controls a driver such that the rotator performs a distribution motion after a water supply process and a washing motion after the distribution motion. An amount of rotation of the rotator in the distribution motion is less than an amount of rotation of the rotator in the washing motion. A driving load of the driver is reduced by reducing a moment of inertia acting on the rotator by separating laundry from the rotator. With the reduced driving load, the driver may be easily controlled, and a water flow for washing may be efficiently formed.