Revolution counter using magnetic bubble device for multi-turn absolute encoder

Fusao Kohsaka*, Toshio Iino, Yoshiaki Kudou, Yasuhiro Sakamaki, Toshitsugu Ueda

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


A revolution counter using a magnetic bubble device and permanent magnets has been developed that can count up/down and maintain shaft revolutions without using electrical energy. It consists of a newly developed dedicated magnetic bubble chip, a pair of bias magnets, a ring magnet, a pair of coils wound around the chip, and a signal processing circuit. A multi-turn fully absolute encoder has been realized by using this counter in conjunction with an optical encoder which we also developed. It is expected that there will be numerous applications for this encoder, including use as a replacement for conventional mechanical counters.

Original languageEnglish
Pages (from-to)803-806
Number of pages4
JournalSensors and Actuators: A. Physical
Issue number1-3
Publication statusPublished - 1989
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Instrumentation


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