Power Tool Direction Sensing Controller Using Motor Voltage Signals
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Solution Overview
Problem
Existing portable hand-held power tools lack efficient control mechanisms to determine and differentiate motor rotation direction, leading to inconsistent performance in forward and reverse operations.
Innovation Solution
Incorporating a controller that determines motor direction based on voltage signals and operates the power tool using distinct control schemes for forward and reverse rotations, utilizing a reversing box and motor controller to manage the direction and speed of the motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional power tool uses simple switches and knobs for control, then the device complexity is low, but the control precision and performance consistency between forward and reverse operations deteriorates
Solution Approach 1:
The patent replaces traditional mechanical direction control (switches and knobs) with an electronic controller that automatically senses motor rotation direction through voltage signal analysis. The controller monitors motor voltage characteristics to determine rotation direction, eliminating the need for complex mechanical direction-sensing mechanisms while improving direction control precision.
Solution Approach 2:
The controller automatically determines the motor's rotation direction by analyzing voltage signals from the motor itself, without requiring external direction-sensing devices or user input. The system uses the motor's own electrical characteristics (voltage polarity and signal patterns) to self-identify rotation direction, simplifying the overall device architecture while enhancing control precision.
2Adaptability or versatility
If the power tool uses a single control scheme for both forward and reverse operations, then the device complexity is low, but the performance and adaptability deteriorates
Solution Approach 1:
The patent implements dynamic control by allowing the controller to switch between different control schemes based on the detected motor rotation direction. The system adapts its control parameters and strategies in real-time according to whether the motor is rotating forward or in reverse, optimizing performance for each operational mode while maintaining a unified control architecture.
Solution Approach 2:
The controller modifies operational parameters such as voltage polarity, current direction, and control signal characteristics based on the detected rotation direction. By dynamically adjusting these electrical parameters, the system achieves adaptability for both forward and reverse operations without requiring separate physical control systems for each direction.
3Ease of operation
If the power tool lacks automatic direction detection, then the device complexity is low, but the ease of operation and user control deteriorates
Solution Approach 1:
The controller automatically detects and determines the motor's rotation direction by analyzing voltage signals, eliminating the need for users to manually indicate or configure direction settings. The system self-identifies the rotation direction and automatically adjusts its control strategy, making operation easier while the controller handles the complexity of direction sensing and adaptation.
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
Enables precise control of motor direction and speed, allowing the power tool to operate effectively in both forward and reverse modes with improved user control and performance.
Implementation Method 1
The controller is configured to receive a signal from the motor. The signal received from the motor may be a motor voltage signal.
Data Source
AI summary
A power tool with a motor which is rotatable in a forward direction and a reverse direction. A tool holder is driven by the motor. The power tool has a user operable trigger for operating the motor, a reversing switch for choosing the direction of rotation of the motor and a controller. The controller determines a direction of rotation of the motor based on a characteristic of the motor.