Brushless Motor Control Board Integration for Compact Driver Drills
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Solution Overview
Problem
The existing driver drills have a large size due to the longitudinal length of the motor housing and complex wiring structures caused by the separation of the control board from the motor, leading to poor workability during assembly.
Innovation Solution
The control board is integrated into the motor housing near the brushless motor, simplifying the wiring structure and allowing for a more compact design by positioning the circuit board between the motor and power transmission parts, with the switching element arranged around the power transmission part for improved cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the control board is accommodated in the handle housing separate from the motor, then the motor housing length is reduced, but the wiring structure becomes complex and assembly workability deteriorates
Solution Approach 1:
The control board is integrated into the motor housing, merging the control function with the motor assembly. This eliminates the need for separate wiring between the handle housing and motor housing, simplifying the wiring structure while maintaining compact motor housing dimensions.
2Length of stationary object
If the control board is accommodated in the handle housing, then the motor housing length is reduced, but the assembly workability becomes poor
Solution Approach 1:
By integrating the control board into the motor housing, the assembly process is simplified as the control board is positioned adjacent to the motor, allowing for easier connection and assembly operations compared to the separated configuration.
3Temperature
If the switching element is positioned away from the power transmission part, then the cooling efficiency is reduced, but the structural design is simplified
Solution Approach 1:
The switching element is positioned in close proximity to the power transmission part, creating a localized cooling arrangement where the cooling fan can directly cool the switching element. This local optimization improves cooling efficiency without requiring complex system-wide cooling structures.
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
This configuration enhances the assembly workability, reduces the motor housing length, and achieves a more compact driver drill design while improving cooling efficiency for the switching elements.
Implementation Method 1
a brushless motor; a housing including, a motor housing accommodating the brushless motor
Data Source
AI summary
An electric tool including: a motor; a housing including, a motor housing accommodating the motor, and a handle housing having one end connected to the motor housing and another other end configured to be provided with a detachable battery pack; an output part partially accommodated in the motor housing and configured to be driven by the motor; and a control board accommodated in the motor housing and configured to control the motor.