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DESIGN, ANALYSIS AND IMPLEMENTATION OF A NOVEL DOUBLE SIDED E-CORE TRANSVERSE FLUX MACHINE WITH AXIAL AIRGAP

Husain, Tausif
http://rave.ohiolink.edu/etdc/view?acc_num=akron1500561964286682

Abstract Details

2017, Doctor of Philosophy, University of Akron, Engineering.
Direct drive applications are an attractive alternative to geared systems due to their high efficiency. This type of application requires electric machines operating at low speed with high torque. As a result, electric machines with high torque densities are preferred in this application. Machines with high torque densities typically employ rare-earth based NdFeB magnets. However, rare earth material is limited and their prices are volatile. Therefore, it is important to develop alternative high torque density machines that do not require rare-earth materials. Axial flux and Transverse flux machines (TFM) offer high torque densities. However, they suffer from low power factor due to high flux leakage. To improve the power factor rare earth based NdFeB magnets are used traditionally. This dissertation presents a double-stator single rotor E-cored TFM that can reduce leakage flux and improve power factor without needing rare-earth magnets. The machine uses ferrite magnets that are arranged in a flux-concentrating manner in the rotor. The novel topology is analyzed by developing analytical sizing equations, performing detailed 3D finite element analysis (FEA) based machine design and cogging torque minimization. The characteristics of the TFM are determined from FEA model and used to analyze the dynamic stability and performance. A novel winding configuration for wide speed operation of the proposed machine is also presented. The proposed machine has an airgap flux in the axial direction, winding current in the circumferential direction and the flux is linked between the stator and the rotor in the transverse plane. These flux paths require 3D FEA for the design of the machine. However, 3D FEA is time-consuming. The first section of the dissertation involves the development of simplified analytical sizing equations for the proposed machine topology. Detailed FEA analysis is then performed on the machine to characterize the effect of different geometric parameters on the machine. Cogging torque is a critical issue in the design of TFMs. Different cogging torque minimization techniques and their applicability to the proposed machine are presented. Key methods of cogging torque minimization are identified and used as design variables for the optimization using the design of experiments (DOE), based on Taguchi method. Different winding configurations and their associated drive for the proposed dual stator machine is also investigated. A new winding structure through manipulation of the end connections is then proposed. The proposed structure offers greater flexibility in torque profiling and greater flux weakening region. A rotating reference frame model of the machine is presented. This model aids the stability and performance analysis. The proposed machine topology is verified with 3D FEA and an experimental prototype built at the Alternative Energy Laboratory of the University of Akron. The experimental results of the proof of principle machine further validated the different concepts presented in this dissertation.
Yilmaz Sozer (Advisor)
Malik Elbuluk (Committee Member)
Igor Tsukerman (Committee Member)
Dane Quinn (Committee Member)
Kevin Kreider (Committee Member)
238 p.
Electrical Engineering; Electromagnetics
Transverse flux, Machine, Motor, Wind generator, Two phase, 1 kW, Axial Flux, Design, Optimization, Cogging torque, Analytical, sizing, dual winding, split winding, experimental Permanent magnet, direct drive, ferrite magnet, comparison, review

Recommended Citations

Citations

  • Husain, T. (2017). DESIGN, ANALYSIS AND IMPLEMENTATION OF A NOVEL DOUBLE SIDED E-CORE TRANSVERSE FLUX MACHINE WITH AXIAL AIRGAP [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1500561964286682

    APA Style (7th edition)

  • Husain, Tausif. DESIGN, ANALYSIS AND IMPLEMENTATION OF A NOVEL DOUBLE SIDED E-CORE TRANSVERSE FLUX MACHINE WITH AXIAL AIRGAP. 2017. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1500561964286682.

    MLA Style (8th edition)

  • Husain, Tausif. "DESIGN, ANALYSIS AND IMPLEMENTATION OF A NOVEL DOUBLE SIDED E-CORE TRANSVERSE FLUX MACHINE WITH AXIAL AIRGAP." Doctoral dissertation, University of Akron, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1500561964286682

    Chicago Manual of Style (17th edition)

akron1500561964286682
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This open access ETD is published by University of Akron and OhioLINK.