Electric Power Tool Motor Control Stage Timing
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Solution Overview
Problem
Conventional electric power tools, such as screwdrivers, do not allow users to advance the timing of starting specific stages in the motor control processing, limiting user flexibility during screw-tightening operations.
Innovation Solution
An electric power tool with a microcomputer-controlled circuit that enables users to set the operation mode to a measurement mode, allowing for advanced timing of starting specific stages, thereby allowing users to initiate the measurement mode at desired times and reducing the time required for torque measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional multi-stage control processing is used for motor control during screw-tightening, then the screw-tightening process is structured and controllable, but users cannot advance the timing of starting specific stages as they desire
Solution Approach 1:
The patent applies dynamics by making the control stage transition timing adjustable rather than fixed. The microcomputer allows users to set custom timing for transitioning between control stages (S1, S2, S3) based on actual torque values detected during operation. This transforms the static, predetermined stage progression into a dynamic, adaptable process that responds to real-time operational conditions and user preferences.
2Productivity
If all control stages are executed in sequence, then complete torque control is achieved, but time is consumed for measurements and processing in each stage
Solution Approach 1:
The patent implements preliminary action by pre-setting multiple control stages with predetermined torque thresholds and transition conditions. The microcomputer is programmed with advance instructions for when to transition between stages based on detected torque values. This allows the system to automatically progress through stages without real-time decision delays, maintaining high productivity while ensuring complete torque control through the structured multi-stage approach.
3Adaptability or versatility
If fixed control conditions are used for each stage, then the control process is simple and reliable, but adaptability to different user requirements and conditions is limited
Solution Approach 1:
The patent applies parameter changes by allowing users to modify control parameters such as torque thresholds, timing delays, and transition conditions for each control stage. The microcomputer stores and processes these adjustable parameters, enabling the same hardware system to adapt to different screw-tightening requirements, material types, and user preferences without changing the physical structure, thereby achieving high adaptability through software-based parameter configuration.
Data Source
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AI summary
An electric power tool (1) includes a motor (4) and a controller (48). The controller (48) is configured to control the motor (4). Specifically, the controller (48) is configured to operate in at least two modes: a first mode and a second mode. The first mode includes a plurality of stages having different control conditions related to the motor (4). The second mode includes at least a common stage having control conditions same as those for a specific stage among the plurality of stages of the first mode. The common stage of the second mode starts more quickly than the specific stage of the first mode.