modified direct torque control (DTC) scheme for

interior permanent magnet synchronous machine (IPMSM) is investigated

in this paper, which features in very low flux and torque

ripple and almost fixed switching frequency. It is based on the compensation

of the error flux linkage vector by means of space vector

modulation. Modeling and experimental results show that the flux

and torque ripples are greatly reduced when compared with those

of the basic DTC.With the new scheme, very short sampling time is

not essential. All the advantages of the basic DTC are still retained.

In addition, fixed switching frequency at different operating conditions

becomes possible.

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