NDLI: A simple motion estimator for variable-reluctance motors

Content Provider	IEEE Xplore Digital Library
Author	Harris, W.D. Lang, J.H.
Copyright Year	1972
Abstract	A simple motion estimator for inverter-driven variable-reluctance motors is presented. The estimator probes unexcited phases with short voltage pulses from the inverter, and evaluates the resulting currents to measure the phase inductances. From these inductances, instantaneous motor position is estimated. Individual position estimates are optionally combined by a state observer to produce smoothed position and velocity estimates. Next, the secondary phenomena of eddy currents in the motor laminations, inverter switching noise, magnetic coupling between motor phases, and quantization introduced by digital implementation are all examined for their effects on estimator performance. Each phenomenon is addressed by a modification of the estimation. Finally, the estimator is evaluated experimentally using an inverter-driven three-phase motor having six stator poles and four rotor poles. The estimator is implemented digitally with an Intel 8031 microcomputer and little extra hardware. Further, it is embedded into a closed-loop controller of the inverter and motor.<>
Sponsorship	IEEE Industry Applications Society
Starting Page	237
Ending Page	243
Page Count	7
File Size	791239
File Format	PDF
ISSN	00939994
Volume Number	26
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1990-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Motion estimation Phase estimation Pulse measurements State estimation Probes Voltage Pulse inverters Current measurement Phase measurement Induction motors
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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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
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