Contactless Handle Power Transfer With Grip Detection Alignment
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Solution Overview
Problem
Existing contactless power supply devices for electric tools lack efficiency in power transmission between the main body part and auxiliary grip, and there is no effective method to detect handle attachment, which affects the control of the electric unit.
Innovation Solution
A contactless power supply device with a protruding power transmission module and a housed power reception module in the handle, along with a detection unit to detect grip and control the electric unit, using a screw mechanism for alignment and magnetic resin to enhance power transmission efficiency and suppress metallic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the power transmission module is disposed within the main body part, then the device structure is compact, but power supply efficiency between the main body part and handle deteriorates
Solution Approach 1:
The power transmission module is segmented from the main body case and protrudes outward, allowing the power reception module in the handle to be positioned closer to the power transmission coil. This spatial segmentation resolves the contradiction by prioritizing power transmission efficiency while managing the increased device complexity through modular design.
2Ease of repair
If the power transmission module is disposed within the main body part, then the device structure is integrated, but maintenance and replacement of the power transmission module becomes difficult
Solution Approach 1:
The power transmission module is designed as a separable component that protrudes from the main body case, enabling independent removal and replacement. This segmentation principle allows maintenance personnel to access and service the power transmission module without disassembling the entire device, resolving the contradiction between ease of repair and device integration.
Solution Approach 2:
The power transmission module is extracted from the internal structure of the main body case and positioned externally. This extraction enables direct access to the module for maintenance and replacement operations, significantly improving ease of repair while maintaining a relatively integrated device appearance when the module is installed.
3Reliability
If no detection unit is provided in the handle, then the device structure is simpler, but the ability to detect handle attachment and control the electric unit deteriorates
Solution Approach 1:
A detection unit is installed in the handle to detect whether the handle is being gripped or attached. This detection information is fed back to the control system, which then controls the operation of the electric unit accordingly. The feedback mechanism ensures reliable handle attachment detection and appropriate system control, resolving the contradiction between reliability and device complexity.
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
Improves power supply efficiency between the main body and handle, facilitates easy replacement and maintenance, and allows for accurate detection of handle attachment to control the electric unit effectively.
Implementation Method 1
a power transmission module to be provided to protrude from the main body case, and having a power transmission coil electrified based on power supplied to the main body part
Implementation Method 2
a power reception module housed in the handle to face the power transmission module when the handle is fixed to the main body case, and having a power reception coil contactlessly supplied with power via the power transmission coil
Data Source
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AI summary
A contactless power supply device (1) includes a handle (10) attachable and detachable with respect to a main body case (3) at least partially covering a main body part including an electric unit, a power transmission module (20) to be provided to protrude from the main body case (3), and having a power transmission coil (21) electrified based on power supplied to the main body part, a power reception module (30) housed in the handle (10) to face the power transmission module (20) when the handle (10) is fixed to the main body case (3), and having a power reception coil (31) contactlessly supplied with power via the power transmission coil (21), and a detection unit (40) provided in the handle (10), driven based on the power supplied via the power reception module (30), and configured to detect whether the handle (10) is being gripped.