NDLI: Batteryless sensorless bicycle speed recorder with hub dynamo and STT-MRAM

Content Provider	IEEE Xplore Digital Library
Author	Tanaka, A. Douseki, T. Umeki, Y. Kawaguchi, H. Yoshimoto, M. Tsunoda, K. Sugii, T.
Copyright Year	2015
Description	Author affiliation: Ritsumeikan Univ., Kusatsu, Japan (Tanaka, A.; Douseki, T.; Umeki, Y.) \|\| Kobe Univ., Kobe, Japan (Kawaguchi, H.; Yoshimoto, M.) \|\| Fujitsu Labs. Ltd., Kanagawa, Japan (Tsunoda, K.; Sugii, T.)
Abstract	A batteryless sensorless bicycle speed recorder system with a hub dynamo that functions as both a power source and a speed sensor has been developed. The hub dynamo produces a voltage waveform with more than ten AC cycles per rotation of the bicycle wheel, which enables precise determination of speed and acceleration. The data is stored in a spin-transfer-torque magnetoresistive random-access memory (STT-MRAM) that has perpendicular magnetic tunnel junctions (MTJs) and an infinite rewriting capability. For writing operation, the MRAM employs an intermittent write operation, which involves high-speed writing with a duty cycle of less than 0.01%. This reduces the average power dissipation of the MRAM to that of the standby mode. A road test showed that a fabricated speed recorder mounted on a bicycle stored and reproduced accurate values of a large acceleration and its duration when the brakes were suddenly applied while the bicycle was being ridden.
Sponsorship	IEEE
Starting Page	1
Ending Page	4
File Size	1182146
Page Count	4
File Format	PDF
e-ISBN	9781479982035
DOI	10.1109/ICSENS.2015.7370539
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-11-01
Publisher Place	South Korea
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Bicycles Acceleration Generators Wheels Power dissipation Accidents Roads STT-MRAM Batteryless Bicycle Speed recorder Hub dynamo
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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