NDLI: Evaluation of losses in DC machines-a statistical approach

Content Provider	IEEE Xplore Digital Library
Author	Safiuddin, M.
Copyright Year	1988
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Buffalo Univ., Amherst, NY, USA (Safiuddin, M.)
Abstract	The power ratings of the drive systems used cyclic duty applications are dictated by the thermal considerations associated with the losses produced by the machine during an operating cycle and the specified production rate. A study was conducted to determine an expression that would describe these losses as a function of its operating speed and torque. Multiple regression was applied to the data collected from a set of sample machines for this purpose. Starting with the analysis of individual expressions for each of the components of losses in a DC machine, the author presents two regression models. The first one, based on a sample size of ten machines, provides an expression for determination of operating point losses at any specified speed and torque per unit of rated machine losses (at rated speed and torque). The second model provides an expression for the determination of rated losses in percent of machine power rating as a function of rated motor speed, armature volume, and percent armature droop. The design of the enclosure influences the power rating and hence the rated losses for a given armature volume. Mean estimates are presented for the determination of percent droop and armature volume for a range of power ratings from 50 to 800 hp.<>
Starting Page	551
Ending Page	556
File Size	434627
Page Count	6
File Format	PDF
DOI	10.1109/IAS.1988.25114
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1988-10-02
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	DC machines Production systems Torque
Content Type	Text
Resource Type	Article

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