Washing machine and controlling method for same
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Solution Overview
Problem
Washing machines experience motor overload due to the opposite rotations between the drum and pulsator, leading to potential damage and inefficiency.
Innovation Solution
A washing machine design with a controller that adjusts the rotation speed and time of the pulsator's motor in response to temperature changes, reducing the load on the motor by altering the rotation speed or time when a preset temperature is reached, and maintaining these adjustments until the end of a washing cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pulsator rotates in the opposite direction from the drum to improve laundry performance, then washing effectiveness is improved, but motor overload occurs
Solution Approach 1:
The patent applies dynamics by making the pulsator's rotation speed variable rather than fixed. The controller dynamically adjusts the pulsator's rotation speed based on the drum's rotation speed to maintain an optimal speed difference, preventing motor overload while preserving washing effectiveness. This is achieved through continuous monitoring and adjustment of rotational parameters during the washing cycle.
Solution Approach 2:
The patent changes the parameter of rotation speed from a constant value to a variable value that adapts to operating conditions. By modifying the pulsator's rotation speed parameter in response to drum speed changes, the system prevents excessive speed differences that cause motor overload, while maintaining sufficient relative motion for effective washing.
2Productivity
If the pulsator rotates at high speed to enhance washing action, then washing effectiveness is improved, but motor temperature increases
Solution Approach 1:
The patent implements feedback control by monitoring the speed difference between the drum and pulsator, and adjusting the pulsator's rotation speed accordingly. When the speed difference exceeds a predetermined threshold indicating potential overheating, the controller reduces the pulsator speed to maintain safe operating temperatures while preserving adequate washing action.
Data Source
AI summary
A washing machine according to one aspect of the disclosure comprises: a body having a laundry input port; a water tank provided inside the body and for storing water; a drum rotatably provided inside the water tank; a pulsator provided inside the drum and rotating in the direction opposite from the rotational direction of the drum; a first motor providing a driving force to the pulsator; a second motor providing a driving force to the drum; a first inverter controlling a current applied to the first motor; a second inverter controlling a current applied to the second motor and having a temperature sensing function; and a control unit controlling the first inverter such that the rotational speed of the first motor and/or the rotation time per period of the first motor is reduced if the temperature of the second inverter reaches a predetermined first temperature.