Dissertation
SIMULATION COMPARISON AND EXPERIMENTAL VALIDATION OF LOW CURRENT WINDING CONFIGURATIONS OF NINE-PHASE INDUCTION MOTORS FOR ELECTRIC VEHICLES
Washington State University
Doctor of Philosophy (PhD), Washington State University
01/2021
DOI:
https://doi.org/10.7273/000006441
Handle:
https://hdl.handle.net/2376/119510
Abstract
One area of multi-phase motor research that has received less attention is the property or benefit of reduced current per phase without increasing voltage per phase. It is widely known that discharging a battery at lower currents extends run time on a full charge, and long term has the potential to extend battery life. Reducing current per phase in theory would regulate stored energy or battery life more efficiently whilst maintaining the same performance as a conventional three-phased motor. This work provides a comparative analysis of four winding configurations of a 72 slot 30 kW nine-phase induction motor, in three different load torque conditions. A three-phase 30 kW motor is used as the baseline for comparison within the simulation. Emphasis is placed on manipulating winding configurations in the nine-phase machines to achieve reduced phase currents. In this dissertation an induction motor is designed using a classical design algorithm, concurrently with ANSYS Maxwell to simulate the design. The stator, rotor, and slot geometries are kept constant for all motor configurations. Simulation results indicate reductions in current from 43 A to as low as 20 A. These reductions are possible primarily due to reduced line voltages in multi-phase motors which opens the opportunity to adjust conductor numbers and voltages to achieve comparable performance. Core losses are also reduced when currents are lowered. Validation of the finite element analysis (FEA) package was performed using a previously published work as well as an experimental test setup of a 5 Hp 4-pole, nine-phase induction motor. The nine-phase 5 Hp test motor was built on the existing frame of an off the shelf three-phase induction motor. To power the motor a nine-phase power supply was built using three, three-phase power inverters. A 600 Mhz microcontroller was used to supply sinusoidal pulse width modulation (SPWM) signals to the inverters. Upon comparison the published work and test simulation showed good agreement. A 2% deviation in key results (Efficiency, Torque, Voltage, Current) was seen in the simulation comparison with the published work. The test motor comparison showed an efficiency of 81.7% at a 3Nm load torque on point with the simulation results which showed an efficiency of 82% with the same load.
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Details
- Title
- SIMULATION COMPARISON AND EXPERIMENTAL VALIDATION OF LOW CURRENT WINDING CONFIGURATIONS OF NINE-PHASE INDUCTION MOTORS FOR ELECTRIC VEHICLES
- Creators
- Jaime Stephen Lue
- Contributors
- Changki Mo (Advisor)Mohamed A Osman (Advisor)Jow-Lian Ding (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Mechanical and Materials Engineering, School of
- Theses and Dissertations
- Doctor of Philosophy (PhD), Washington State University
- Publisher
- Washington State University
- Number of pages
- 97
- Identifiers
- 99900592055701842
- Language
- English
- Resource Type
- Dissertation