article · IEEE Transactions on Energy Conversion
This research analyses and compares the performance of synchronous reluctance motors (SynRMs) using a conventional star winding versus a combined star-delta winding. The study used finite element method simulations, which were then validated by experimental results. Under normal operating conditions, the combined star-delta winding increased the motor's output power by approximately 5% and its efficiency by 0.20% for the same current, compared to the conventional star connection. A significant advantage of the star-delta winding was observed during a phase fault: the motor retained 80% of its rated torque, whereas the star-connected motor only maintained 40%. Additionally, the star-delta configuration significantly reduced torque ripple when a phase fault occurred.
Improving electric motor performance and fault tolerance is crucial for many industries. Motors that are more efficient save energy, while those that can continue operating effectively despite faults enhance reliability and reduce downtime in critical applications.
This research presents an improved winding configuration for synchronous reluctance motors that could lead to more robust and efficient electric motors. Potential users include manufacturers of industrial machinery, electric vehicles, or any application requiring high reliability and efficiency. The findings are based on simulations validated by experiments, indicating this is applied research with potential for further development towards practical implementation.
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This paper analyzes and compares the synchronous reluctance motor (SynRM) performance for a conventional star winding and for a combined star-delta connected winding under healthy and faulty conditions. The finite element method is used to simulate the SynRM characteristics in case of normal star and in case of combined star-delta connected windings. For the healthy case, it was found that for the same current, the SynRM output power increased by about 5% for the star-delta connected windings compared with the conventional star connection. Moreover, the efficiency increased slightly by 0.20%. Probably the strongest advantage of the combined star-delta winding is observed when a phase fault occurs. When one phase is missing, for the same current, the star-delta connected motor keeps 80% of the rated torque in the healthy case, while the star connected motor only keeps 40%. Furthermore, the torque ripple of the star wound machine is extremely high in case of a missing phase, compared to the star-delta wound machine. Simulation results were validated by experimental results to show the effectiveness of the star-delta connected windings on the SynRM.
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DOI: 10.1109/tec.2016.2576641
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