Tool detection for kitchen appliances
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Solution Overview
Problem
Existing kitchen appliances with multiple accessories face challenges in ensuring correct motor drive parameters due to the variety of tools and functions, leading to user confusion and potential incorrect settings, which can result in poor performance and consumer complaints.
Innovation Solution
A kitchen appliance power unit equipped with a vibration sensor that identifies connected tools without requiring electrical connections or user input, allowing for automatic adjustment of motor speed and torque based on sensed vibrations, eliminating the need for complex user controls and reducing the risk of incorrect settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple accessories are included in a single integrated device with user controls, then the variety of functions is improved, but the risk of user confusion and incorrect settings increases
Solution Approach 1:
The system automatically detects the attached accessory type and configures appropriate motor drive parameters without requiring user intervention. The vibration sensor and controller work together to identify the tool class and select suitable operating parameters, making the system self-configuring and eliminating user confusion about correct settings
Solution Approach 2:
The vibration sensor provides feedback information about the attached tool to the controller, which then automatically adjusts motor drive parameters. This closed-loop feedback system ensures the correct function is activated based on the detected tool type, resolving the contradiction between offering multiple functions and preventing user confusion
2Measurement precision
If RFID tags or electrical connections are integrated in tools for identification, then the accuracy of tool detection is improved, but the complexity and cost of the tool increases
Solution Approach 1:
The identification function is extracted from the tool and placed in the power unit. The vibration sensor and controller in the power unit perform tool identification without requiring any electronic components in the tool itself, simplifying the tool design while maintaining detection accuracy
Solution Approach 2:
Electronic identification systems (RFID, electrical connections) are replaced with a mechanical vibration-based identification system. The vibration sensor detects mechanical vibrations from the tool to identify its class, eliminating the need for complex electronic components in the tool while achieving reliable detection
3Adaptability or versatility
If user controls are provided for selecting motor settings, then the adaptability to different tools is improved, but the risk of incorrect user selection increases
Solution Approach 1:
The system automatically determines the correct motor drive parameters based on vibration sensor detection of the attached tool. This self-service approach eliminates user controls for setting selection, ensuring reliable and correct parameter selection without depending on user knowledge or attention
4Reliability
If sealing is increased to protect electrical connections and sensors, then the reliability of electrical connections is improved, but the cost and complexity of the solution increases
Solution Approach 1:
The identification function is extracted from the tool and placed in the power unit, eliminating the need for sealed electronic components in the tool. The vibration sensor in the power unit detects tool characteristics without requiring sealed connections in the removable tool
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
The solution enables accurate motor control for various tools, ensuring optimal performance without user intervention, reducing errors and enhancing user experience by automatically adapting to the connected tool's characteristics, thus improving operational efficiency and reducing product returns.
Implementation Method 1
a vibration sensor arranged to sense vibrations of a tool connected to the mechanical interface, the vibration sensor being connected to the controller for feeding information representing the sensed vibration to the controller
Implementation Method 2
The blender head includes a magnet that is sensed by a Hall-effect sensor on the motorised base apparatus
Data Source
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AI summary
A kitchen appliance has a power unit 2 and a removable tool 4 connected through a mechanical interface 12. A controller 16 controls an electric motor 14 driving the tool 4 through the mechanical interface. A vibration sensor 18 identifies the vibrations of the tool and feeds the vibration data to the controller 16. The controller may use the vibration data to identify the tool and/or to select an appropriate drive pattern based on the sensed vibration.