NDLI: Encoderless control of synchronous machines with permanent magnets

Content Provider	IEEE Xplore Digital Library
Author	Kennel, R.
Copyright Year	2010
Description	Author affiliation: Technische Universitaet Muenchen, Germany, Electrical Drive Systems and Power Electronics (Kennel, R.)
Abstract	High resolution optical encoders are used in industrial servo drives with position and/or speed control for providing the respective feedback signals. In applications with lower accuracy requirements resolvers are used as feedback sensors with respect to lower cost. As a resolver is nothing else than an electrical AC machine of special design, there is the basic idea to operate the servo motor itself like a resolver - in parallel to its original drive operation, of course. High frequency resolver signals are injected to the servo motor without disturbing its original purpose (i. e. the production of torque). The reaction of the servo motor on the high frequency signals can be detected by the current sensors, which are available with respect to the current control loop anyway. A lot of schemes and concepts for encoderless AC drive control providing good operation during standstill are already published. Acceptance by industry, however, is not very extended. The main reasons for hesitations in industry are ● enhanced processing performance being necessary for the controller or signal processor ● additional sensors or hardware ● parameters to be adjusted with respect to encoderless control
Starting Page	19
Ending Page	24
File Size	436631
Page Count	6
File Format	PDF
ISBN	9781424470198
ISSN	18420133
e-ISBN	9781424470204
DOI	10.1109/OPTIM.2010.5510480
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-05-20
Publisher Place	Romania
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical feedback Industrial control Sensorless control Frequency Synchronous motors Permanent magnets Servomechanisms Synchronous machines Servomotors Signal resolution
Content Type	Text
Resource Type	Article

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