Symmetrical stator flux orbits for direct flux and torque controlled drives

A. Veltman

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

1 Citation (Scopus)

Abstract

In this paper a solution is given for the problem of asymmetrical flux orbits, inherent to the field acceleration method (FAM) which limits the stator flux amplitude between two levels in an induction motor. It is shown that the allowable stator flux band /spl Delta//spl Psi/ has a number of optimal values which generate the smallest radial ripple (reactive power ripple) resulting in polygons with 6,18,30,42...etc. sides. The problem of asymmetrical flux orbits originates in the uncertain 'position' of the flux vector /spl Psi//spl I.oarr/ at the start of a segment of 60/spl deg/. The proposed solution consists of a radial-band controller that measures the flux position 6 times per cycle and adapts the band for /spl Delta//spl Psi/ accordingly. Within 2 cycles the orbit shape is stable and symmetrical at all possible frequencies and accelerations. Such an orbit eliminates the FAM problem of inter- and even-current harmonics, which can cause low frequency torque and speed changes, especially for the coarse orbits of sub-kHz high power VSIs. Experimental results of a DSP controlled small 2.2 kW setup are given.
Original languageEnglish
Title of host publication1996 IEEE Industry Applications Society Annual Meeting
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Pages197-204
Volume1
ISBN (Print)0-7803-3544-9
DOIs
Publication statusPublished - 1996
Eventconference; Proc. 1996 IEEE Industry Applications Society Annual Meeting, Volume 1, San Diego, CA, 6-10 October 1996 -
Duration: 1 Jan 1996 → …

Conference

Conferenceconference; Proc. 1996 IEEE Industry Applications Society Annual Meeting, Volume 1, San Diego, CA, 6-10 October 1996
Period1/01/96 → …
OtherProc. 1996 IEEE Industry Applications Society Annual Meeting, Volume 1, San Diego, CA, 6-10 October 1996

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