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http://hdl.handle.net/11375/20255
Title: | Fractional Slot Concentrated Winding Interior Permanent Magnet Machines with Reluctance Torque: Inductance-Based Methodology for Comprehensive Analysis, Design, and Control |
Authors: | Ge, Hao |
Advisor: | Emadi, Ali |
Department: | Electrical and Computer Engineering |
Publication Date: | 2016 |
Abstract: | This thesis studies the inductance based methodology for analysis, design and control of fractional slot concentrated winding (FSCW) interior permanent magnet (IPM) machines. The properties of FSCW are studied analytically based on the modified winding function method, which is developed based on turns function. The modified winding function method simplifies the inductance analysis of FSCW. The closed form representations of air gap inductance and mutual inductance are obtained. The inductance properties of FSCW machines with salient rotors are investigated by exploring the flux line distributions, and the equivalent air gap lengths of d- and q-axis are approximated. The inductance difference between d- and q-axis of the FSCW machine is obtained analytically and compared with the integer slot distributed winding (ISDW) machines. An FSCW IPM machine design methodology is proposed. The relationship between the mechanical output characteristic and parameters is established, which guides the machine topology selection. The machine geometry model is developed parametrically and optimized using the response surface method (RSM), which enables the optimization to be implemented with reduced computational effort. The performances of the designed FSCW IPM machine are evaluated by comparing with the traditional designs, and it shows advantages in terms of torque capability and/or losses. The comprehensive mathematical model of the FSCW permanent magnet synchronous machine (PMSM) is obtained, which is different from idealized PMSM model and features extra coupling terms. However, for symmetric 3-phase machines, if the windings are Y connected, the coupling terms only introduces 3rd order harmonic to 0-axis, and the field oriented control (FOC) can still be applied. The optimal current control strategies are proposed based on nonlinear optimization algorithm. The global loss minimization and the current minimization are developed and validated by finite element analysis (FEA) and/or experiments. The FSCW IPM machine is prototyped and tested. A simplified characterization method is developed based on the machine drive. It utilizes the voltage and current variables in the control loop to identify the flux linkage characteristics. The current minimization based optimal current control is achieved. When torque feedforward control is applied, the machine output performance, including torque capability, torque accuracy, efficiency and current transition are validated. Thermal performance of the machine is evaluated under continuous power operation and peak power operation. The FEA based thermal model is developed and calibrated using steady state experimental results. The transient thermal performance is studied by simulations and verified by experiments. |
URI: | http://hdl.handle.net/11375/20255 |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Description | Size | Format | |
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HaoGe_PhD_thesis.pdf | 5.94 MB | Adobe PDF | View/Open |
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