Laundry Drum Reverse-Start Control for Motor Torque Reduction
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Solution Overview
Problem
Laundry machines face issues with excessive current consumption and motor overheating due to high torque loads during the initial rotation of the drum, leading to inefficient operation and potential motor damage, especially when dealing with wet and heavy laundry.
Innovation Solution
A control method that involves rotating the drum in a reverse direction by a predetermined angle to generate inertial force, reducing the initial torque required for forward rotation, and adjusting this angle based on the quantity of laundry to optimize energy use and prevent motor overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the drum is rotated directly from stationary position with high torque, then the drum can start rotating to process laundry, but the motor experiences excessive current consumption and overheating
Solution Approach 1:
The drum is first rotated in reverse direction by a predetermined angle before the forward rotation is initiated. This preliminary reverse rotation creates inertial force that reduces the initial torque requirement for forward rotation, thereby decreasing current consumption and preventing motor overheating while still achieving the required drum rotation speed for laundry processing
2Force
If high torque is applied to rotate the stationary drum, then the drum can overcome the weight of wet laundry, but the motor becomes overloaded and may be damaged
Solution Approach 1:
A reverse rotation by a predetermined angle is performed before forward rotation to generate inertial force. This preliminary action reduces the peak torque demand during startup, preventing motor overload and potential damage while still enabling the motor to overcome the weight of wet laundry during the washing cycle
Solution Approach 2:
The drum is rotated in the opposite (reverse) direction before the intended forward rotation. This preliminary anti-action creates inertial force that counteracts the gravitational force of wet laundry, reducing the torque burden on the motor and enhancing motor reliability by preventing overload conditions
3Productivity
If the drum rotates forward directly without reverse rotation, then the washing cycle can proceed efficiently, but abnormal noise and motor damage occur
Solution Approach 1:
The reverse rotation by a predetermined angle is executed as a preliminary step before forward rotation. This action reduces the shock load on the motor and drum mechanism, minimizing abnormal noise generation while maintaining washing efficiency throughout the cycle
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 load on the motor, decreases current consumption, and minimizes motor heating, enhancing the reliability and efficiency of the laundry machine while preventing abnormal noise and motor damage.
Implementation Method 1
rotating a stationary drum in a direction by a predetermined angle within 180 degrees... generating a torque in the opposite direction of the rotating direction... rotating the drum at least one revolution in the opposite direction of the rotating direction
Data Source
AI summary
A laundry machine capable of washing or drying laundry and a method for controlling the same are provided. The method includes a first rotation including rotating a stationary drum in a first rotating direction by a predetermined angle within ˜180 degrees, and a second rotation including rotating the drum, in a direction opposite to the first rotating direction, at least one revolution.