Magnetic Core Coil Layout for Cooler Continuous Stimulation
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Solution Overview
Problem
Conventional magnetic stimulation devices face challenges in maintaining surface temperature below safety standards due to heat generation, especially in smaller devices, which limits the number of pulses and magnetic flux density, making continuous stimulation difficult.
Innovation Solution
The device incorporates a magnetic core with legs shaped to reduce magnetic flux leakage, stacked thin sheets for interlayer insulation, and a cooling mechanism with spaces for gas flow, along with conductors arranged in layered or nested configurations to manage heat and maintain magnetic flux density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large current is supplied to the coil to achieve effective magnetic stimulation, then the magnetic flux density increases, but the temperature of the coil rises significantly
Solution Approach 1:
The coil is divided into multiple windings arranged in layers or nests, with each winding contributing to the overall magnetic flux while distributing the heat generation across multiple segments. This segmentation allows better heat dissipation while maintaining the required total magnetic flux density.
Solution Approach 2:
The patent transitions from a single-layer coil configuration to multi-layer or nested coil structures, adding a dimensional aspect to the coil arrangement. This dimensional change increases the surface area for heat dissipation while maintaining the magnetic flux density through strategic positioning of multiple windings.
2Volume of moving object
If the device size is reduced to accommodate smaller patients, then the device becomes more portable and comfortable, but the heat capacity of the coil decreases leading to higher temperature rise
Solution Approach 1:
The patent employs nested coil structures where multiple windings are arranged concentrically, one inside another. This nesting approach maximizes the magnetic flux density within a compact volume while distributing the heat generation across multiple layers, improving heat dissipation efficiency in a small device.
Solution Approach 2:
The patent applies different winding densities and configurations to different regions of the coil structure. By optimizing the local arrangement of windings in specific areas, the device achieves efficient heat dissipation in critical regions while maintaining the required magnetic flux density, allowing compact sizing without excessive temperature rise.
3Temperature
If air-cooling is used to suppress temperature rise, then the coil temperature is reduced, but the number of pulses cannot be increased to the desired value due to insufficient cooling capacity
Solution Approach 1:
The patent incorporates cooling channels and heat dissipation structures into the coil design from the beginning, rather than adding them as afterthoughts. The cooling pathways are pre-positioned to efficiently remove heat during high-intensity pulse sequences, enabling the device to sustain higher pulse rates while maintaining safe operating temperatures.
Solution Approach 2:
The patent introduces cooling media (such as air or liquid coolant) as an intermediary substance that absorbs heat from the coil and transports it away. By optimizing the interaction between the coil and the cooling medium through carefully designed cooling channels and contact surfaces, the system achieves effective heat removal that supports higher pulse rates.
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
The design effectively suppresses temperature rise, allowing for continuous magnetic stimulation with maintained flux density, reducing discomfort and enabling effective muscle contraction without pain, even in smaller devices.
Implementation Method 1
when a pulse current is supplied to a coil placed near the surface of a body to cause the coil to generate a magnetic flux, a current is induced in the body by the magnetic flux
Implementation Method 2
the magnetic core 2 is a stack of thin sheets 3 in which the sheets 3 are stacked one on top of another
Implementation Method 3
a cooling mechanism with spaces for gas flow
Implementation Method 4
a conductor 1b (1b′) that is wound around the first leg 2b in a coil shape; and a conductor 1c (1c′) that is wound around the second leg 2c in a coil shape
Data Source
AI summary
A magnetic stimulator includes a magnetic core, conductors, and a casing. The magnetic core includes a body portion, and leg parts that protrude in the same direction from the body portion. The conductors are wound in a coil manner respectively around the leg parts. The casing is a container for housing the magnetic core and the conductors. The leg parts of the magnetic core are formed such that cross-sectional areas thereof that are parallel to a plane which simultaneously crosses the leg parts gradually decrease from base parts on the body portion side toward tips.