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Dual three-phase machines are attractive due to advantages such as inherent fault tolerance. During postfault situation, the same magneto-motive force as in healthy operation should be maintained. Furthermore, it is also important to minimize the copper losses. Several strategies have been proposed to improve the postfault performance under open-phase fault. The maximum-torque (MT) strategy obtains...
Fault tolerance is an advantageous characteristic of multiphase machines when compared with three-phase ones. During open-phase fault, the current references need to be adapted to provide ripple-free torque. As a consequence of this modification, the post-fault phase currents might be larger than the rated current. Such situation leads to overheating, and to preserve the integrity of the system, some...
Multiphase machines (MPMs) have become serious contenders in several applications, such as offshore wind energy and electric vehicles. Low-order current harmonics arise in actual drives due to converter and machine nonlinearities, thus producing losses and torque ripple. In comparison to three-phase machines, in MPMs this effect is aggravated because of the existence of low-impedance subspaces. To...
Low-order odd harmonics are particularly problematic in multiphase drives, due to the small impedance in the no-torque subspaces. The harmonics can be compensated by proportional-integral controllers in multiple synchronous reference frames (SRFs). In three-phase systems, the computational burden of such scheme is often avoided by implementing instead resonant controllers (RCs) tuned at the harmonics...
Proportional-integral (PI) controllers in a positive-sequence (PS) synchronous reference frame (SRF) are widely employed for ac machines. Resonant controllers (RCs) in stationary frame are equivalent to PI ones in a positive- and a negative-sequence SRF simultaneously. However, as shown in this work, the additional open-loop pole at the negative-sequence in RCs alters the trajectories of the closed-loop...
Non-sinusoidal back electromagnetic forces cause torque ripple in permanent magnet synchronous motors. These harmonics should be reduced by means of an appropriate current control to improve performance. Good results have been obtained with linear regulators such as repetitive controllers in synchronous reference frame (SRF) and resonant controllers in stationary frame. Repetitive controllers present...
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