Bay City, MI, United States
Bay City, MI, United States

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Kim T.,Halla Mechatronics | Chowdhury M.,Halla Mechatronics | Islam M.,Halla Mechatronics | Gebregergis A.,Halla Mechatronics | Sebastian T.,Halla Mechatronics
ECCE 2016 - IEEE Energy Conversion Congress and Exposition, Proceedings | Year: 2016

This research provides a detailed analysis of build variations for mass produced permanent magnet synchronous motors on key performances such as torque ripple, and back-emf harmonics. The study defines the rule for worst case scenarios hence provide tolerance limits for each of the design parameters to be controlled to achieve certain performances under volume production. The research also sorts out the sources for each torque ripple order. A finite element based electromagnetic simulation is used for the tolerance study and effectively used for defining realistic limits for key design parameters. The motors were built and tested to verify the theories which showed strong correlation and justify the values of such study before launching volume production. © 2016 IEEE.


Raja R.,Halla Mechatronics | Sebastian T.,Halla Mechatronics | Wang M.,University of Michigan | Gebregergis A.,Halla Mechatronics | Islam M.,Halla Mechatronics
ECCE 2016 - IEEE Energy Conversion Congress and Exposition, Proceedings | Year: 2016

Accurate knowledge of motor position is required in the motor drive application where smooth torque performance is needed. The error in position causes ripple in the developed current and thereby produce torque ripple. This paper analyzes the various effects of position sensor error in the current developed and in the torque generated in a current controlled Permanent Magnet Synchronous Motor drive. This research is focused on analyzing effect of position error on smooth production of torque in an IPMSM drive due to various inaccuracies. The analysis is verified through simulation and test results by measuring torque and torque ripple performances of a IPMSM drive. The results can be easily extended to SPM drive also. © 2016 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.


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.


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.


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.


Chowdhury M.H.,Halla Mechatronics
2016 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2016 | Year: 2016

This paper presents a comparison of various fault scenarios originated from the machine and machine's drive in a permanent-magnet synchronous motor (PMSM) drive. In this study both surface mount permanent magnet motor (SPM) and Interior permanent magnet motor (IPM) are included. Analytical and finite element (FE) analyses are presented to analyze the performance of both motors under different fault conditions. Test results to validate the analytical and FE results are also included in the paper. © 2016 IEEE.


Chowdhury M.H.,Halla Mechatronics
2016 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2016 | Year: 2016

The paper focuses on predicting electromagnetic friction by modeling core losses of electric motors for high performance applications. The study shows procedural ways to simulate core loss beginning with theoretical explanation of the widely used core loss model, Bertotti model which was compared with more accurate loss surface model using finite element analysis. Individual contribution of core losses from each motor component was calculated to compare between the theoretical models. First, the finite element (FE) simulation procedure was introduced and followed by core loss model used for the simulation. The core loss for such motors will be calculated at no load and several operating torque/speed points. The simulation results were compared with test results to verify the applicability of the proposed model. Finally, Thermal analysis has been carried out to show the effect of core losses on temperature rise of motor. © 2016 IEEE.

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