Two-Button Kitchen Motor Control for Intuitive Speed Selection
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Solution Overview
Problem
Existing kitchen appliances with electric motors for driving processing tools often require complex control systems and multiple buttons, making them difficult to produce inexpensively and use intuitively.
Innovation Solution
A kitchen appliance with a simple two-button system that allows users to select between two rotation speeds by depressing the first or second button, using a speed selector that adjusts voltage to the motor, eliminating the need for complex tap changers and enabling intuitive operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple buttons or complex control systems are used to control motor speeds, then more speed options and control precision are achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
A single push button performs multiple functions: it can be pressed briefly for low speed operation and pressed longer (or held) for high speed operation. This multi-functional design eliminates the need for separate buttons for different speed levels, reducing device complexity while maintaining speed control versatility.
Solution Approach 2:
The control system dynamically changes motor speed based on the duration of button pressing. The evaluation unit monitors how long the button is held and transitions between speed levels accordingly, providing adaptive speed control from a single static button interface.
2Adaptability or versatility
If multiple buttons are used for speed control, then more speed selections are available, but ease of operation decreases due to more buttons to learn and remember
Solution Approach 1:
One push button provides multiple speed control functions through varying press duration, making the interface more intuitive and easier to operate than multiple separate buttons. Users don't need to remember which button corresponds to which speed, as a single button adapts its function based on how long it is pressed.
Solution Approach 2:
The control system automatically determines the appropriate speed level based on the button press duration without requiring user input about desired speed. The system serves itself by interpreting the press duration and selecting the appropriate speed, reducing the cognitive load on the user.
3Manufacturing precision
If tap changers are used for speed control, then precise speed regulation is achieved, but manufacturing cost and production complexity increase
Solution Approach 1:
The patent replaces mechanical tap changers with an electronic control system using a push button, evaluation unit, and motor control unit. This substitution eliminates complex mechanical components while achieving precise speed regulation through electronic timing and control, reducing manufacturing complexity and cost.
Solution Approach 2:
An evaluation unit acts as an intermediary between the simple push button input and the motor control system. It processes the button press duration and generates appropriate control signals for the motor, enabling precise speed control without requiring complex direct mechanical linkages.
4Device complexity
If automatic shutdown is not implemented, then device simplicity is maintained, but operational safety decreases
Solution Approach 1:
The control system continuously monitors the state of the push button and automatically adjusts motor operation accordingly. When the button is released, the system receives feedback that the user wants to stop operation and automatically shuts down the motor, providing safety without requiring additional shutdown buttons or complex interlocks.
Solution Approach 2:
The motor control system automatically manages its own shutdown based on button release detection, eliminating the need for separate shutdown mechanisms. The system serves itself by interpreting the absence of button pressure as a stop command, enhancing safety while maintaining simplicity.
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 simplifies production, reduces costs, and enhances operational safety and reliability by allowing easy selection of motor speeds and automatic shutdown when the appliance is released or falls.
Implementation Method 1
the first button, when depressed, closes a first electrical switch to operate the motor at the first speed
Implementation Method 2
the second button, when depressed, closes a second electrical switch to operate the motor at a second speed
Data Source
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AI summary
A kitchen device (1) having an electric motor for driving a processing tool (3) wherein the kitchen device (1) has a first push button (5) which can be pushed down in order to operate the motor at a first rotation speed. The kitchen device (1) has a second push button (6) which can be pushed down in order to operate the motor at a second rotation speed. The invention provides a kitchen device (1) which can be operated at at least two different rotation speeds, can advantageously be produced easily and at low cost, and can be handled intuitively and safely.