EC Motor Precontrol Angle Adjustment for Hand-Held Power Tools
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Solution Overview
Problem
Electronically commutated motors in hand-held power tools face inefficiencies and thermal issues due to non-optimal precontrol angles, leading to reduced mechanical power output and shortened motor lifespan, especially under varying load conditions.
Innovation Solution
A hand-held power tool with electronically commutated motor allows users to adjust the precontrol angle through a user-controlled operator panel, enabling adaptation to different mechanical load conditions, thereby improving efficiency and extending motor lifespan and battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed precontrol angle is used for electronic commutation, then the motor control is simplified, but the motor efficiency decreases under varying load conditions
Solution Approach 1:
The precontrol angle is made dynamically adjustable through an operator control panel that allows users to select from multiple precontrol angle settings (e.g., first, second, third settings) corresponding to different load conditions. This transforms the static commutation control into a dynamic system that adapts to varying operational requirements, resolving the contradiction between control simplicity and efficiency.
Solution Approach 2:
The invention changes the electrical parameter (precontrol angle) to optimize motor performance under different load conditions. By providing multiple discrete precontrol angle settings that users can select based on the mechanical load, the system achieves better efficiency without requiring complex continuous control algorithms.
2Loss of energy
If an adaptive precontrol angle adjustment is implemented, then the motor efficiency improves, but the device complexity increases
Solution Approach 1:
The control system provides dynamic adaptability through a user-selectable precontrol angle setting mechanism. Instead of implementing complex automatic sensing and adjustment systems, the invention offers multiple predefined adaptive settings that users can choose based on their knowledge of the load conditions, achieving adaptability with minimal additional complexity.
Solution Approach 2:
The system enables the user to manually configure the optimal precontrol angle setting based on the operational conditions. This self-service approach allows the motor to operate efficiently under varying loads without requiring the control system to automatically sense and adjust parameters, thereby limiting the increase in device complexity.
3Power
If the precontrol angle is not optimized for the current load, then the mechanical power output is reduced, but the thermal cycling of the motor winding increases
Solution Approach 1:
The invention provides multiple discrete precontrol angle settings (first, second, third settings) that correspond to different mechanical load conditions. By allowing users to select the appropriate precontrol angle setting based on the current load, the system optimizes the electrical parameter to simultaneously maximize mechanical power output and minimize thermal cycling, thereby extending motor service life.
Solution Approach 2:
The system provides predefined precontrol angle settings that have been optimized in advance for different load conditions. Users can select from these pre-prepared settings based on the mechanical load, avoiding the need for real-time optimization calculations and ensuring that the motor operates in an optimal regime from the start of each operational phase.
Data Source
AI summary
A hand-held power tool includes an electronically commutated motor including a motor winding. Motor electronics of the hand-held power tool are configured to electronically commutate the motor winding using a selected one of a plurality of electrical precontrol angles, thereby adapting the motor winding to different mechanical load conditions of the electronically commutated motor.