An Improved Design of Induction Motor for EV with Electromagnetic and Thermal Simulation
Date Issued
2016
Date
2016
Author(s)
Yang, Chieh
Abstract
The purpose of this study is to improve the continuous operation ability of induction motor for electric vehicle. To achieve this, we tried reducing heat sources and increasing heat dissipation at the same time. To reduce heat sources without changing most of the geometry of the motor, the magnetic circuit was optimized to increase efficiency. We adjusted the parameters of winding pitch, stator and rotor slot shapes sequentially and find out the combination of parameter values with the highest efficiency as a magnetic circuit optimization solution. To increase the heat dissipation, we used a lumped-circuit thermal model software to create a heat transfer model of the motor to investigate the strategies to improve motor cooling. One the one hand, we improved the design for the flow fields of cooling water to figure out the water channel form with better cooling ability. On the other hand, we designed a new cooling path for internal air that can directly transfer heat from air to the water jacket. Finally, we integrated the design with the optimized magnetic circuit and motor cooling and analyzed efficiency in consideration of temperature-dependent resistance. We obtained the temperature rise and the average efficiency of the motor operating for 30 minutes continuously. Thus, we found out the maximal power with which the motor can operate continuously for 30 minutes. To conclude, the continuous operation ability of the improved motor design was indeed promoted.
Subjects
induction motor
electric vehicle
magnetic circuit
cooling
motor design
Type
thesis
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ntu-105-R03522510-1.pdf
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