NDLI: A Direct Current Torque Motor for Application on a Variable Frequency Transformer

Content Provider	IEEE Xplore Digital Library
Author	Truman, P. Stranges, N.
Copyright Year	2007
Description	Author affiliation: GE Motors, Peterborough, ON (Truman, P.)
Abstract	A wound rotor induction machine can be used in a variable frequency transformer (VFT) to allow interconnection of two power grids that run asynchronously to each other. The transfer of power across the air gap of the machine is controlled by variation of the torque that is applied to the shaft of the VFT. The magnitude of the power transfer is directly proportional to the shaft torque while the direction of power flow is dependent on the direction in which the torque is applied. The rotor of the VFT spins at a speed that is proportional to the difference between the two grid frequencies. When two grids with the same nominal frequency are interconnected, the torque on the shaft of the VFT must be controlled at stall or near stall conditions. DC motors are well suited to this type of duty and have been used in the past for applications with similar requirements; for instance, steel mill looper motors operate at near stall conditions. High torque low speed DC motors have also been applied to steel mill roughers and low speed steel mill finishers. This paper will describe some of the considerations that must be addressed when designing a DC torque motor for a VFT application. It will also outline the main features of a 20 pole, 2,796 kW, 48/93 rpm, 750 V dc motor that was built for the commercial installation of a VFT at Hydro- Quebec's Langlois substation.
Starting Page	1
Ending Page	5
File Size	1381737
Page Count	5
File Format	PDF
ISBN	142441296X
ISSN	19325517
DOI	10.1109/PES.2007.385703
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	DC motors Frequency Shafts Steel Milling machines Rotors Torque control Wounds Induction machines Power grids Transformer DC Machines Variable Frequency
Content Type	Text
Resource Type	Article

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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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