Refrigerator Door Motor Speed Control for Safe Pressure Release
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Solution Overview
Problem
Existing refrigerators require significant force to open the door due to pressure differences, necessitating rapid motor rotation, which poses safety risks and convenience issues, especially when users are unable to open the door with both hands.
Innovation Solution
A refrigerator system that controls the rotational speed of the motor to safely and conveniently open and close the door by sensing user presence, door position, and external objects, adjusting speed based on potential collision risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the motor rotates quickly to overcome pressure difference, then the door can be opened, but user safety is compromised due to collision risk
Solution Approach 1:
The motor speed is dynamically adjusted based on door position. The control unit increases motor speed when the door is in the initial closed position to overcome pressure differential, then reduces speed when the door reaches a predetermined angle position, preventing collision with users while ensuring effective door opening
Solution Approach 2:
The rotational speed parameter of the motor is changed based on door opening angle. The control unit modifies the motor speed parameter from high (for overcoming pressure) to low (for safety near fully open position), resolving the contradiction between opening force and user safety
2Reliability
If the motor provides significant force to open the door, then the door opens reliably, but the system complexity increases due to speed control requirements
Solution Approach 1:
A sensor detects the door opening angle and provides feedback to the control unit. The control unit uses this feedback to automatically adjust motor speed, achieving reliable door opening and user safety without requiring complex manual control systems
Solution Approach 2:
The control system automatically adjusts motor speed based on door position feedback without user intervention. The system self-regulates the motor operation, simplifying the overall control architecture while maintaining reliability and safety
Data Source
Figure 1
Figure 2a
Figure 2b~2d
AI summary
A refrigerator is provided. The refrigerator includes a body including a door, a door opening device including a motor and configured to open the door through a rotation of the motor, a first sensor configured to sense an opening of the door, a second sensor configured to sense a position of the door, and a processor. The processor control, based on a user command for the opening of the door being obtained, the motor to rotate at a first speed, based on the opening of the door being sensed by the first sensor, the motor to rotate by reducing speed in stages to a second speed which is slower than the first speed, and based on a position of the door being sensed in a first position by the second sensor, the motor to open the door to a second position by rotating at the second speed.