Electric Drive Motor Torque Regulation via Time Derivative Control
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Solution Overview
Problem
Battery-operated power tools face mechanical component failure due to spontaneous increases in load torque, which can be caused by fluctuating loads, leading to reduced operating life and user safety concerns, as existing solutions require manual intervention to reset the motor after torque regulation.
Innovation Solution
A device and method that monitor operating variables of an electric drive motor, activating a regulating unit based on time derivatives to manage output torque increases, automatically deactivating after a predetermined period to prevent component damage and ensure user safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-strength components or components of larger dimensions are used to avoid mechanical component failure, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The control unit performs preliminary detection of load torque changes and activates the regulating unit before mechanical failure occurs. By monitoring operating variables and detecting spontaneous load torque increases early, the system takes preventive action to regulate output torque, avoiding the need for oversized protective components.
Solution Approach 2:
The patent replaces mechanical protection (high-strength components) with an electronic control system. The control unit monitors operating variables and uses electronic regulation to limit output torque increases, substituting mechanical redundancy with intelligent electronic intervention.
2Reliability
If a stopping device is activated to prevent mechanical component failure, then reliability is improved, but ease of operation deteriorates due to manual reset requirement
Solution Approach 1:
The regulating unit automatically deactivates itself after a predetermined period of time without requiring manual intervention. The control unit continuously monitors operating variables and automatically resets the regulation, enabling the system to serve itself and eliminating the need for user acknowledgment or manual resetting.
Solution Approach 2:
The control unit continuously monitors operating variables and uses this feedback to determine when to activate and deactivate the regulating unit. The system reads the current state, determines whether regulation is needed based on detected load torque changes, and automatically adjusts accordingly, creating a closed-loop self-regulating system.
3Reliability
If the regulating unit remains active after control intervention, then reliability is maintained, but productivity decreases due to continuous limitation
Solution Approach 1:
The regulating unit dynamically adjusts its activation state based on real-time monitoring of operating variables. Rather than remaining continuously active, the control unit activates regulation only when spontaneous load torque increases are detected and automatically deactivates it after a predetermined period, allowing the system to adapt between protective and full-performance states.
Solution Approach 2:
The regulation operates periodically rather than continuously. The control unit monitors operating variables at regular intervals, activates regulation for a predetermined period when needed, then automatically deactivates it. This periodic operation ensures protection during critical moments while maintaining full productivity during normal operation.
Data Source
AI summary
A device for regulating an increase in the output torque over time of an electric drive motor, including a monitoring unit for monitoring an operating variable of the electric drive motor, a regulating unit for regulating the operating variable for regulating the increase in output torque over time, a control unit for activating the regulating unit as a function of a time derivation of the monitored operating variable, the regulating unit being designed to be deactivated after a predetermined period of time. A method for regulating an increase in the output torque over time of an electric drive motor is also described. A corresponding tool and a computer program having program code for carrying out the method are also described.