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Thermal Analysis of a Permanent Magnet Assisted Synchronous Reluctance Motor Using Lumped Parameter Thermal Modeling

Herbert, Joseph
http://rave.ohiolink.edu/etdc/view?acc_num=akron1491313645053898

Abstract Details

2017, Master of Science, University of Akron, Electrical Engineering.
With the advent of high power density motors in applications such as electric vehicles, the need for an effective thermal analysis of motors is further warranted to ensure their efficient and reliable operation. While existing Lumped Parameter Thermal Models (LPTMs) provide a convenient method for the thermal evaluation of motor designs, they provide a single, average temperature of the various regions of the motor without data on the temperature variation in the axial direction. LPTMs are a convenient reduced finite-element method to analyze the thermal performance of electric motors based on their design parameters and operating conditions. In this thesis the thermal analysis of a Permanent Magnet Assisted Synchronous Reluctance Motor (PMa-SynRM) is conducted by proposing two LPTMs: 1. Radial Lumped Parameter Thermal Model (R-LPTM). 2. Axial Lumped Parameter Thermal Model (A-LPTM). The R-LPTM adopts an existing approach considered for the thermal modeling of interior rotor configurations with the key contribution being the modeling of the unique rotor con figuration of the PMa-SynRM under study. In this approach, the individual geometries of the motor are modeled as single nodes, the voltages of which correspond to the average temperature for the respective machine part. The A-LPTM introduces a novel thermal model by employing the Finite Volume Method (FVM). While the R-LPTM models heat flow only in the radial direction due to the lamination structure of the stator and the rotor regions, the extension of this approach to the axially thermally shorted conductor coil sides, the magnets and the shaft results in a relative oversimpli cation of the heat transfer in these regions. While equivalent lumped thermal resistances model axial heat flow in these regions in the R-LPTM, by employing the FVM in the A-LPTM a higher resolution of axial temperature data is determined by providing a more accurate method of radial and axial heat flow modeling in these regions. In this model, the conductors, magnet and shaft nodes are evaluated as a function of the position along the axial length of the machine to determine their corresponding axial temperature variation. The results of both the thermal models formed in this thesis have been evaluated and the results were compared with both experimental and Finite Element Analysis (FEA) data. The experimental data was determined using temperature sensors mounted at various points in the machine. For the temperature measurement of the magnet an innovative Printed Circuit Board (PCB) integrated with sensors and wireless data transmission capabilities was mounted on the rotor for real time axial temperature measurement of the magnets. An analysis comparing the data from the R-LPTM and the A-LPTM shows the advantages of the A-LPTM. Additionally, plots of the accuracy of data obtained from both the models clearly highlights their respective accuracy when compared to the experimentally measured values. Lastly, a sensitivity analysis of both models was determined as a function of the thermal resistance values to establish the dependency of the accuracy of the thermal resistance determination on system.
Seungdeog Choi (Advisor)
Guo-Xiang Wang (Committee Member)
Malik Elbuluk (Committee Member)
Jin Kocsis (Committee Member)
140 p.
Electrical Engineering
Lumped Parameter Thermal Model; PMa-SynRM; Permanent Magnet Assisted Synchronous Reluctance Motor

Recommended Citations

Citations

  • Herbert, J. (2017). Thermal Analysis of a Permanent Magnet Assisted Synchronous Reluctance Motor Using Lumped Parameter Thermal Modeling [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1491313645053898

    APA Style (7th edition)

  • Herbert, Joseph. Thermal Analysis of a Permanent Magnet Assisted Synchronous Reluctance Motor Using Lumped Parameter Thermal Modeling. 2017. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1491313645053898.

    MLA Style (8th edition)

  • Herbert, Joseph. "Thermal Analysis of a Permanent Magnet Assisted Synchronous Reluctance Motor Using Lumped Parameter Thermal Modeling." Master's thesis, University of Akron, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1491313645053898

    Chicago Manual of Style (17th edition)

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