Universal Electronic Device for Hand Tool Motor Control
Solution Overview
Problem
Existing electronic devices for hand machine-tools are limited by fixed parameter sets, requiring different sets for products with different motors, leading to a high variance in electronic devices across various hand machine-tools.
Innovation Solution
An electronic device with a memory unit that stores multiple control parameter sets and a control unit that selects the appropriate set based on operating parameters of the drive unit, such as ignition point or rotation speed, allowing for adaptable control and regulation of drive units across different hand machine-tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed parameter set is used for each drive unit type, then the control is optimized for that specific drive unit, but the variance of electronic devices increases and universality is reduced
Solution Approach 1:
The electronic device is designed with a memory unit that stores multiple control parameter sets and a control unit that can select between them based on detected operating parameters. This allows a single electronic device to control different drive unit types (universal motor, asynchronous motor, synchronous motor) by automatically selecting the appropriate parameter set, thereby achieving universality without sacrificing control optimization for any specific motor type.
Solution Approach 2:
The system changes control parameters dynamically by selecting from multiple pre-stored parameter sets based on the detected drive unit type. The control unit detects characteristics such as ignition point or rotation speed and switches between different parameter sets (e.g., different PWM frequencies, voltage levels, current limits) to optimize control for each specific motor type while using the same hardware platform.
2Adaptability or versatility
If multiple parameter sets are stored for different drive units, then adaptability increases, but the memory requirements and device complexity increase
Solution Approach 1:
Multiple control parameter sets are pre-calculated and stored in the memory unit before operation. This preliminary preparation allows the control unit to simply retrieve and apply the appropriate parameter set based on detection, rather than calculating optimal parameters in real-time. The parameter sets include pre-configured values for PWM frequency, voltage, current limits, and other control parameters specific to each motor type.
Solution Approach 2:
The control unit automatically detects the drive unit type through monitoring operating parameters (ignition point, rotation speed) and autonomously selects the appropriate parameter set from memory without requiring external intervention or complex decision-making algorithms. The system serves itself by using its own operational characteristics to determine which parameter set to apply.
3Extent of automation
If parameter selection is based on operating parameters like ignition point, then automatic adaptation is achieved, but the measurement and detection requirements increase
Solution Approach 1:
The control unit continuously monitors operating parameters such as ignition point (the point in the AC cycle when the triac triggers) and rotation speed of the drive unit. Based on this feedback, the system automatically determines the drive unit type and selects the appropriate control parameter set. The feedback loop enables automatic adaptation without requiring manual configuration or complex external measurement equipment.
Data Source
AI summary
An electronic device for controlling and/or regulating a drive unit includes a memory configured to make available at least two at least partially different control parameter sets which are each usable to at least one of control and regulate one of at least two drive units. The electronic device further includes a control unit which is configured to select one of the at least two parameter sets of the memory unit as a function of at least one operating parameter of the drive unit.