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Mikail R.,ABB | Husain I.,North Carolina State University | Islam M.S.,Halla Mechatronics | Sozer Y.,University of Akron | Sebastian T.,Halla Mechatronics
IEEE Transactions on Industry Applications | Year: 2015

This paper presents a method of profiling the phase currents to minimize the torque ripple of switched reluctance machines (SRMs) operating in four-quadrant mode over the entire speed range of operation. The method is based on machine and controller design through coupled simulation of the finite-element-based machine model and the dynamic controller model. The method considers the mutual coupling effect between conducting phases. The research quantifies the effect of sensor error and manufacturing build variations on the level of torque ripple minimization. The mitigation processes to address the issues in mass production are also presented. © 1972-2012 IEEE.

Mikail R.,North Carolina State University | Mikail R.,ABB | Husain I.,North Carolina State University | Sozer Y.,University of Akron | And 2 more authors.
IEEE Transactions on Industry Applications | Year: 2014

The paper presents a novel fixed switching frequency predictive current control method for switched reluctancemachines (SRM). The proposed deadbeat predictive current controller accurately predicts the required duty ratio for thePWM pulse for a given reference current in each digital time step over the entire speed range of operation. The pulsewidth depends on the operating conditions, machine parameters and the rotor position. The controller utilizes themachine inductance profile as a function of current and rotor position to accurately predict the required voltage. Thecontrol method is studied through computer simulation and followed by experimental validation. The method is suitablefor torque ripple sensitive applications requiring accurate tracking of a given current profile and mitigating theaudible noise due to the switching of the inverter. © 1972-2012 IEEE.

Islam M.S.,Halla Mechatronics | Islam R.,Nexteer Automotive | Sebastian T.,Halla Mechatronics
IEEE Transactions on Industry Applications | Year: 2014

This paper provides a detailed finding of the mechanics of vibration in permanent magnet (PM) synchronous motors due to electromagnetic (EM) origins. Several fractional-slot PM topologies are investigated to quantify the vibration phenomenon that is influenced by motor slot/pole and winding configurations. This paper also sorts out the vibration mode order that is responsible for deformation and the resulting excitation frequency. A finite-element-based cosimulation in the EM and structural domain is used to find the radial forces and, hence, the displacement, to quantify the vibration/noise performance of these selected motors. The displacement and frequency are converted to the sound pressure level to show the relative differences in the noise levels among these motor topologies. The selected motors were experimentally tested to verify the theoretical findings. © 1972-2012 IEEE.

Gebregergis A.,Halla Mechatronics | Chowdhury M.H.,Halla Mechatronics | Islam M.S.,Halla Mechatronics | Sebastian T.,Halla Mechatronics
IEEE Transactions on Industry Applications | Year: 2015

A model of permanent-magnet synchronous machine (PMSM), including the electromagnetically originated torque ripple, is presented in this paper. This unique representation of such equivalent circuit is highly critical to understand the torque ripple content and to develop an appropriate mitigation scheme for low torque ripple applications requiring four quadrant operations. This research proposes a method to quantify the various sources of torque ripple and modifies the existing dq-model to enhance the modeling capabilities for both surface-mount and interior PMSMs. Finite-element (FE) analysis is used for modeling various PMSMs to verify the lumped circuit model proposed in this research. The theoretical results obtained from analytical and FE analysis are validated using experimental test. © 1972-2012 IEEE.

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