Power Tool Accessory Detection for Automatic Motor Speed Control
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Solution Overview
Problem
Power tools often operate inefficiently or inaccurately due to the lack of automatic adjustment based on the type of accessory attached, leading to suboptimal performance and potential wear, as different accessories require specific operational characteristics like rotational speeds or torque.
Innovation Solution
Incorporating an accessory-type detector coupled with a motor controller that uses an electronic processor and memory to determine the operational characteristics of the accessory, allowing the power tool to automatically adjust its operation based on the detected type, ensuring optimal performance and preventing activation without a properly attached accessory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If automatic accessory-type detection and speed adjustment systems are implemented, then operational precision and accessory compatibility are improved, but device complexity increases due to additional sensors and control electronics
Solution Approach 1:
The patent replaces manual accessory selection and speed setting with an automated detection system. An accessory-type detector (optical or magnetic sensor) automatically identifies the attached accessory type, and a motor controller automatically adjusts motor speed based on the detected accessory characteristics, eliminating the need for manual intervention and reducing operational errors.
Solution Approach 2:
The power tool system performs self-diagnosis and self-adjustment by using the accessory-type detector to automatically identify the attached accessory and the motor controller to automatically set appropriate operational parameters. The system serves itself by eliminating the need for user intervention in accessory identification and speed selection.
2Productivity
If manual speed adjustment is used for different accessories, then device complexity is reduced, but productivity decreases due to time spent selecting and adjusting settings
Solution Approach 1:
The motor controller pre-stores optimal speed settings for different accessory types in its memory. When an accessory is detected, the controller automatically retrieves and applies the corresponding pre-determined speed setting, eliminating the time required for manual speed selection and adjustment during operation.
Solution Approach 2:
The system establishes a feedback loop where the accessory-type detector continuously monitors the attached accessory, communicates its identity to the motor controller, and the controller adjusts motor speed in real-time based on this feedback. This automatic closed-loop control eliminates manual setup time and ensures optimal performance.
3Adaptability or versatility
If fixed motor speed is used, then device complexity is minimized, but adaptability decreases as different accessories require different operational characteristics
Solution Approach 1:
The motor speed transitions from a fixed parameter to a dynamic parameter that automatically adjusts based on the detected accessory type. The motor controller modifies operational characteristics in real-time according to accessory requirements, enabling the system to adapt to different accessories without requiring complex manual configuration.
Solution Approach 2:
The power tool achieves universal compatibility with multiple accessory types through a single automated control system. The motor controller can accommodate various accessories (saws, grinders, drills) by automatically detecting their type and applying appropriate speed settings, making one tool versatile for multiple functions without requiring separate controls for each accessory type.
Data Source
AI summary
Systems and methods are provided for an electric tool (e.g., a power tool) that includes an output driver for receiving an accessory, and an accessory-type detector. A motor of the electric tool is coupled to the output driver for driving the accessory. The power tool also includes an operation trigger for activating the motor and a motor controller. The motor controller includes an electronic processor that is coupled to the accessory-type detector, the motor, the operation trigger, and a memory. The memory stores instructions that when executed by the electronic processor cause the motor controller to detect a characteristic of the accessory from output of the accessory-type detector. The motor controller determines an operational characteristic for the accessory based on the detected characteristic, and controls operation of the motor to drive the accessory according to the operational characteristic when the operation trigger is activated.