Planar Coil PCB Layout for Thrust and Resistance Adjustment
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Solution Overview
Problem
In printed wiring boards used in actuators, it is challenging to finely adjust the thrust generated for magnets, and there is a need to increase electrical resistance for other components, requiring a solution that can adjust both thrust and electrical resistance effectively.
Innovation Solution
A printed wiring board design featuring a substrate with a spiral wiring layer that includes specific portions with reduced current density to control thrust and increased electrical resistance, achieved through the use of first and second winding portions or loop circuit configurations, allowing for adjustable thrust and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a spiral wiring line forming a planar coil is used to generate magnetic field for actuator, then thrust for moving magnet is obtained, but thrust becomes excessively large and cannot be finely adjusted
Solution Approach 1:
The spiral wiring line is divided into multiple winding portions (first winding portion, second winding portion, third winding portion) with different numbers of turns. Each winding portion can be independently configured to control the magnetic field generation, allowing fine adjustment of thrust by selectively activating or deactivating specific portions through separate terminal connections.
Solution Approach 2:
Different winding portions are designed with different local characteristics (different numbers of turns, different positions in the spiral). The first winding portion has a specific number of turns, the second winding portion has a different number of turns, and the third winding portion has yet another number of turns. This local differentiation enables precise control of magnetic field strength and thrust generation.
2Reliability
If wiring density is increased to improve electrical resistance for other components, then current density control becomes more difficult
Solution Approach 1:
The wiring layer is segmented into multiple functional winding portions that can be independently controlled. This segmentation allows different portions to have different electrical resistance characteristics, enabling overall resistance control while maintaining manageable wiring density in each segment.
Solution Approach 2:
The wiring structure incorporates dynamic control capability through multiple terminals connected to different winding portions. By selectively connecting terminals, the effective resistance and current distribution can be dynamically adjusted without changing the physical wiring density, thus managing complexity while achieving resistance control.
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 design enables the suppression of excessive thrust on magnets while increasing electrical resistance, allowing for precise adjustment and improved performance in electronic devices.
Implementation Method 1
thrust for moving the magnet can be obtained by the magnetic field generated by causing a current to flow through the wiring line
Implementation Method 2
thrust for moving the magnet can be obtained by the magnetic field generated by causing a current to flow through the wiring line
Data Source
AI summary
A printed wiring board according to one aspect of the present disclosure includes a substrate, and a wiring layer disposed on the substrate and having a spiral wiring line forming a planar coil. When one direction in a winding direction of the entire wiring line in plan view is defined as a positive direction, the wiring layer has a first portion for reducing a density of a current flowing in the positive direction.