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Optimal High-Speed Design and Rotor Shape Modification of Multiphase Permanent Magnet Assisted Synchronous Reluctance Machines for Stress Reduction.

Tarek, Md Tawhid Bin
http://orcid.org/0000-0002-7001-4227
http://rave.ohiolink.edu/etdc/view?acc_num=akron1510617496931844

Abstract Details

2017, Master of Science in Engineering, University of Akron, Electrical Engineering.
The permanent magnet assisted synchronous reluctance motor (PMa-SynRM) can be defined as a hybrid motor which utilizes the advantages of both the synchronous reluctance motor (SynRM) and the interior permanent magnet motor (IPM). PMa-SynRM’s ability to have a wider flux weakening range and less risk of demagnetization makes it a perfect candidate for high-speed applications. However, one of the main challenges for PMa-SynRM operating as a high-speed motor is the stress generated in the rotor. This thesis presents an optimal design procedure and rotor shape modification of a high-speed multiphase PMa-SynRM for stress reduction. In this study, a high-speed design of a five-phase PMa-SynRM has been done based on a low-speed benchmark model. An overall design procedure consisting of a lumped parameter model (LPM) and a differential evolution strategy (DES) was developed. In this study, a lumped parameter model (LPM) is used to initially design the five-phase PMa-SynRM. By using LPM and design parameters of stator and rotor with given ranges, thousands of design have been generated. From these designs, an optimal high-speed model was developed with the help of a differential evolution strategy (DES). To facilitate high-speed design, a stress function and other performance parameters are included in the objective function (OB). The optimized 25krpm five-phase PMa-SynRM is implemented in the finite element analysis (FEA) for simulation. Simulation results of the average and cogging torque high-speed model have been analyzed. Another high-speed model has been developed without considering stress function in the design. Comparison of stress has been done between the two high-speed models by doing stress analysis. Simulation results indicated that stress can be reduced by 30.14% if it is included in the design process. To reduce the stress of the high-speed PMa-SynRM more, a mini flux barrier (FB) has been added to the rotor. By using DES, the design parameters of the mini FB have been optimized while considering the performance parameters such as average torque, saturation in the mini FB area and the deformation as constraints. Stress analysis has been done to see the improvement after adding the optimized mini FB in the high-speed model. It showed that reduction of stress in the rotor was 15.73% after adding the mini flux barrier. Finally, a novel algorithm of the center post and rib length optimization for the high-speed PMa-SynRM for stress reduction is presented. By using multivariate correlation and nonlinear regression analysis, performance parameters (average torque, induced back EMF, stress, and deformation) have been modeled as a function of the center post and rib length in second-order nonlinear equations. An initially designed 30krpm PMa-SynRM has provided the sample data for those analyses. These nonlinear equations are used for the optimization, whose objective is stress reduction while optimizing the center post and rib length. The comparison has been done between the optimized motor and initially designed motor to observe the improvement. From the results, the reduction of stress with the optimized center post and rib was found to be 16.02%.
Seungdeog Choi (Advisor)
Yilmaz Sozer (Committee Member)
Joan Carletta (Committee Member)
Siamak Farhad (Committee Member)
69 p.
Engineering
High-speed; PMa-SynRM; machine design; stress analysis; lumped parameter model; differential evolution strategy; multivariate correlation; nonlinear regression

Recommended Citations

Citations

  • Tarek, M. T. B. (2017). Optimal High-Speed Design and Rotor Shape Modification of Multiphase Permanent Magnet Assisted Synchronous Reluctance Machines for Stress Reduction. [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1510617496931844

    APA Style (7th edition)

  • Tarek, Md Tawhid Bin. Optimal High-Speed Design and Rotor Shape Modification of Multiphase Permanent Magnet Assisted Synchronous Reluctance Machines for Stress Reduction. 2017. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1510617496931844.

    MLA Style (8th edition)

  • Tarek, Md Tawhid Bin. "Optimal High-Speed Design and Rotor Shape Modification of Multiphase Permanent Magnet Assisted Synchronous Reluctance Machines for Stress Reduction." Master's thesis, University of Akron, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1510617496931844

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Akron and OhioLINK.