Suppression of heat generation in magnetic stimulation coil applied for treating dysphagia

H. Mori, H. Kagaya, S. Izumi, K. Yashima, T. Takagi

Research output: Contribution to journalArticle

Abstract

The authors are developing magnetic stimulation coils for use in the treatment of dysphagia. The prototype coil manufactured in our previous research can induce large contraction of the suprahyoid muscles, which should be trained for normal swallowing. In this study, the heat generation in the coil during magnetic stimulation is investigated and suppressed. A numerical analysis showed that the main cause of the generated heat is the eddy current in the coil conductor induced by magnetic flux from the tip of the magnetic core. The analysis also showed that a parallel coil with a cross connection has an ideal current distribution in the coil conductor and thus best suppresses heat generation during magnetic stimulation. The heat-suppressing coil has parallel divided coil conductors and an appropriate connection between the conductors to level the current in each conductor. Moreover, measurements of the temperature rise in prototype coils during magnetic stimulation confirm that heat generation can be greatly suppressed by dividing the conductor and using an appropriate connection between the divided conductors.

Original languageEnglish
Pages (from-to)84-90
Number of pages7
JournalJournal of the Magnetics Society of Japan
Volume43
Issue number4
DOIs
Publication statusPublished - 01-01-2019

Fingerprint

heat generation
Heat generation
stimulation
coils
conductors
retarding
Magnetic cores
magnetic coils
Magnetic flux
Eddy currents
Muscle
Numerical analysis
prototypes
heat
magnetic cores
current distribution
muscles
eddy currents
contraction
numerical analysis

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Instrumentation
  • Electrical and Electronic Engineering

Cite this

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abstract = "The authors are developing magnetic stimulation coils for use in the treatment of dysphagia. The prototype coil manufactured in our previous research can induce large contraction of the suprahyoid muscles, which should be trained for normal swallowing. In this study, the heat generation in the coil during magnetic stimulation is investigated and suppressed. A numerical analysis showed that the main cause of the generated heat is the eddy current in the coil conductor induced by magnetic flux from the tip of the magnetic core. The analysis also showed that a parallel coil with a cross connection has an ideal current distribution in the coil conductor and thus best suppresses heat generation during magnetic stimulation. The heat-suppressing coil has parallel divided coil conductors and an appropriate connection between the conductors to level the current in each conductor. Moreover, measurements of the temperature rise in prototype coils during magnetic stimulation confirm that heat generation can be greatly suppressed by dividing the conductor and using an appropriate connection between the divided conductors.",
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Suppression of heat generation in magnetic stimulation coil applied for treating dysphagia. / Mori, H.; Kagaya, H.; Izumi, S.; Yashima, K.; Takagi, T.

In: Journal of the Magnetics Society of Japan, Vol. 43, No. 4, 01.01.2019, p. 84-90.

Research output: Contribution to journalArticle

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AU - Mori, H.

AU - Kagaya, H.

AU - Izumi, S.

AU - Yashima, K.

AU - Takagi, T.

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