Direct current ripple compensation for multi-phase fault-tolerant machines

Author

Abd Hafez, A.A. ; Todd, Rebecca ; Forsyth, A.J. ; Cross, Andrew M.

Author_Institution

Sch. of Electr. & Electron. Eng., Univ. of Manchester, Manchester, UK

Volume

5

Issue

1

fYear

2011

fDate

1/1/2011 12:00:00 AM

Firstpage

28

Lastpage

36

Abstract

A second-harmonic direct current (DC) ripple compensation technique is presented for a multi-phase, fault-tolerant, permanent magnet machine. The analysis has been undertaken in a general manner for any pair of phases in operation with the remaining phases inactive. The compensation technique determines the required alternating currents in the machine to eliminate the second-harmonic DC-link current, while at the same time minimising the total rms current in the windings. An additional benefit of the compensation technique is a reduction in the magnitude of the electromagnetic torque ripple. Practical results are included from a 70 kW, five-phase generator system to validate the analysis and illustrate the performance of the compensation technique.

Keywords

DC machines; electric current control; machine control; permanent magnet machines; torque; direct current ripple compensation; electromagnetic torque ripple; multiphase fault tolerant machines; permanent magnet machine; power 70 kW; second-harmonic DC-link current;

fLanguage

English

Journal_Title

Electric Power Applications, IET

Publisher

iet

ISSN

1751-8660

Type

jour

DOI

10.1049/iet-epa.2009.0217

Filename

5710089