article · IEEE Journal of Emerging and Selected Topics in Power Electronics
A five-phase synchronous reluctance motor with a combined star-pentagon winding offers high torque density, low torque ripple, and fault tolerance. To maintain operation during an open-circuit fault, an enhanced control strategy establishes an optimal current angle that maximises torque while reducing torque ripple. The drive configuration pairs the motor with a three-to-five-phase matrix converter. When calculating the maximum torque per ampere operating point, the approach accounts for the effects of both the fault and magnetic saturation on direct- and quadrature-axis inductances. Current in the remaining operational phases is reconstructed to ensure a zero-sequence current of zero. Space vector modulation controls the matrix converter, and the secondary subspace is managed to lower total current harmonic distortions. Performance evaluations using simulations and physical tests on a laboratory prototype drive confirm the viability of the fault-tolerant control method.
Electric motors operating in critical systems require dependable operation even when electrical faults occur. By combining a five-phase motor with an advanced converter control technique, drives can maintain smooth, powerful performance without sudden failures or excessive vibrations when a phase is lost. This reduces unexpected downtime and enhances system reliability.
The control technique targets high-reliability motor drive applications where continuous operation through electrical phase failures is critical. Potential users include manufacturers and developers of specialised electric propulsion or industrial drive systems seeking magnet-free motor alternatives. The technology appears to be applied and tested at a laboratory prototype stage, having been validated through finite element simulations and experimental hardware testing on a prototype drive system.
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A five-phase fault-tolerant combined star-pentagon synchronous reluctance machine (SynRM) can provide a high torque density, minimal torque ripple, and superior fault tolerance. To enhance the performance of SynRM in the case of an open-circuit fault, this article proposes an optimal current angle to maximize the torque and minimize the torque ripple under the fault condition. The drive system consists of a five-phase combined star-pentagon SynRM fed from a three-to-five-phase matrix converter (MC). When determining the operating point of maximum torque per ampere (MTPA), the influence of fault and saturation on the <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$d$ </tex-math></inline-formula> - and <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$q$ </tex-math></inline-formula> -axis inductances is considered. The healthy phases’ currents are reconstructed to guarantee a null value of zero-sequence current. Space vector modulation is applied to control the MC under the fault condition. Under the fault condition, the <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$z$ </tex-math></inline-formula> -subspace is properly controlled to reduce the overall harmonic distortions of current. Moreover, the performance of the drive system is analyzed using the finite element method (FEM) simulation and MATLAB program. Finally, the experimental tests validate the effectiveness of the suggested approach on a SynRM prototype drive system with a three-to-five-phase MC.
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DOI: 10.1109/jestpe.2022.3148188
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