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

Abd Hafez, A.A., Todd, R., Forsyth, A.J. and Cross, Andrew M. (2011). Direct current ripple compensation for multi-phase fault-tolerant machines. IET Electric Power Applications, 5 (1), pp. 28-36.


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.

Publication DOI:
Divisions: Engineering & Applied Sciences > Electrical, electronic & power engineering
Engineering & Applied Sciences > Power engineering and power electronics research group
Aston University (General)
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Uncontrolled Keywords: direct current ripple compensation,electromagnetic torque ripple,multiphase fault tolerant machines,permanent magnet machine,power 70 kW,second-harmonic DC-link current,Electrical and Electronic Engineering
Published Date: 2011-01


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