Built-In Oven Door Speed Control for Load-Independent Motion
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Solution Overview
Problem
High-level built-in cooking appliances experience uneven movement characteristics of the base door due to load and friction conditions, leading to uncomfortable operation.
Innovation Solution
The appliance is equipped with a control device that regulates the drive motor to maintain a constant, load-independent travel speed of the door, using a speed measuring device such as a Hall sensor to ensure consistent movement, and allows users to set traversing speeds for improved usability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the drive motor is operated by simply switching it on or off with specific voltage, then the device complexity is reduced, but the operating characteristics become inconsistent due to load and friction variations
Solution Approach 1:
A speed measuring device (such as a Hall sensor) is integrated into the drive mechanism to continuously measure the actual speed of the door. The control unit receives this speed signal and compares it with the desired speed, then adjusts the motor voltage accordingly to maintain constant speed despite load or friction variations.
Solution Approach 2:
The control unit dynamically adjusts the voltage parameter supplied to the drive motor based on the measured speed. By changing the voltage in real-time according to actual operating conditions, the system maintains consistent door speed while accounting for varying loads and friction.
2Ease of operation
If the door moves at constant speed independent of load, then the operating characteristics are improved, but the device complexity increases due to speed control requirements
Solution Approach 1:
The control unit continuously monitors the door speed via the speed measuring device and automatically adjusts motor voltage to maintain the predetermined constant speed, eliminating the need for manual speed adjustments and ensuring consistent operation.
Solution Approach 2:
The drive system automatically regulates its own operation by using the speed measurement feedback to self-adjust the motor voltage, maintaining constant door speed without requiring external intervention or complex manual control mechanisms.
3Device complexity
If the travel speed is fixed, then the device complexity is reduced, but the adaptability for different users and situations is limited
Solution Approach 1:
The system transitions from a fixed speed mechanism to a dynamic speed control system where the door speed can be adjusted during operation. The control unit responds to user inputs (such as pushing the door harder) and automatically adapts the speed, providing both simplicity and adaptability.
Solution Approach 2:
The predetermined speed parameter is made adjustable within a range (e.g., 40-80 mm/s) based on user needs. The control unit allows selection of different speed levels while automatically maintaining the selected speed constant during operation, combining adaptability with operational consistency.
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 solution provides a uniform and comfortable movement behavior for the base door, independent of load or friction conditions, enhancing user experience and operational safety by allowing speed adjustments and anti-pinch protection.
Implementation Method 1
the speed measuring device includes at least one sensor, in particular a Hall sensor, arranged on a motor shaft of a drive motor of the drive device
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a cooking appliance, in particular, a cooking appliance which is mounted in an elevated manner, which comprises at least one muffle (5) which defines the cooking space (3), whereby the muffle opening thereof (S) is surrounded by a muffle frame, a door (7) which is used to close said muffle opening and a drive device (9, 10) which is used to actuate the door and which is controlled by a control device (13). The drive device can be controlled by the control device such that the door can be actuated independently from the charge.