Browsing by Author "Moallem, M."
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Item Active Cancellation of Vibration in Switched Reluctance Motor Using Mechanical Impulse Response Method(Institute of Electrical and Electronics Engineers Inc., 2019-05-13) Kimpara, M. L. M.; Wang, S.; Caicedo-Narvaez, Carlos Andres; Chen, Tianyu; Pinto, J.; Borges da Silva, L. E.; Moallem, M.; Fahīmī, Bābak; 0000-0001-8398-126X (Fahīmī, B); 0000-0002-1605-6944 (Cacedo-Narvaez, C); 0000-0001-7704-0770 (Chen, T); 56099860 (Fahīmī, B); Caicedo-Narvaez, Carlos Andres; Chen, Tianyu; Fahīmī, BābakVibration and acoustic noise are considered as major factors preventing the widespread use of switched reluctance motor (SRM) drives in industrial and commercial applications. In this paper, a new active vibration cancellation (AVC) strategy for radial vibration is proposed based on the optimal current switching instants. The mechanical impulse response method has been used to estimate the radial vibration of the stator and an optimization routine was developed to define the optimal instants for phase current switching in such a way that the resulting vibration would cancel the vibration caused by prior switching. Experimental verification was conducted on an 8/6 SRM and the results show significant reduction in the stator radial vibration which in turn contributes to reduction of acoustic noise.Item Optimization of Air-Gap Profile in Interior Permanent-Magnet Synchronous Motors for Torque Ripple Mitigation(Institute of Electrical and Electronics Engineers Inc.) Liang, Jingchen; Parsapour, Amir; Yang, Zhuo; Caicedo-Narvaez, Carlos; Moallem, M.; Fahimi, Babak; Liang, Jingchen; Parsapour, Amir; Yang, Zhuo; Caicedo-Narvaez, Carlos; Fahimi, BabakInterior permanent-magnet synchronous motors (IPMSMs) have been widely used due to their high-efficiency and high-power densities. Minimization of torque pulsation resulting in vibration and acoustic noise is one of the important design considerations for IPMSMs. In this paper, a grid on/off search method for the rotor profile is proposed to mitigate torque pulsation. Selection of the rotor profile is due to the fact that air gap is the most sensitive parameter in electric machines wherein changes in flux densities can cause substantial differences in the distribution of forces. A layer comprised 20 partitions with a 0.1 mm thickness and 3° wide grids have been introduced to the rotor surface for each pole, and the possible geometries have been analyzed using the finite-element method in ANSYS Maxwell. An optimal design was found that has the lowest torque ripple with a higher average torque compared to the original design. Genetic algorithm has also been applied to the method to automate the coupling between Maxwell and MATLAB, thereby saving the simulation time. Complete structural analysis has been done for both of the original and optimal designs to verify the superiority and feasibility of the proposed design. ©2019 IEEE.