A magnetic bubble device for revolution counters

Author

Iino, Toshio ; Tsukasa, T. ; Fujino, Kenji

Author_Institution

Yokogawa Electr. Corp., Tokyo, Japan

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

3664

Lastpage

3666

Abstract

A magnetic bubble device (MBD) for revolution counters used for servomotors has been developed. This sensor was designed to count 32487 revolutions with only a 152 bit memory. A magnetic garnet film was chosen so that a wide propagation margin was achieved. The thickness of the film was also optimized so that the bubbles were stretched at a high bias field. The thickness of SiO₂ was chosen to obtain a wide pulse width. The developed MBD achieved wide margins as follows: propagation margin and stretch margin were 25, 24 Oe respectively in the bias field direction, and pulse width margin was 5.6 μsec

Keywords

angular measurement; magnetic bubble memories; magnetic sensors; magnetic thin film devices; servomotors; 152 bit; absolute encoder; high bias field; magnetic bubble device; magnetic bubble memory; magnetic garnet film; optimized film thickness; revolution counters; servomotors; shift register loops; stretch margin; wide propagation margin; Bidirectional control; Counting circuits; Frequency; Garnet films; Magnetic devices; Magnetic sensors; Propulsion; Servomotors; Shafts; Space vector pulse width modulation;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800624

Filename

800624