Design and Optimization of Traction IPMSM With Asymmetrical Damper Bars for Integrated Charging Capability Using Evolutionary Algorithm

The 3-phase windings of interior permanent magnet synchronous machines (IPMSMs) used in electric vehicles (EVs) for traction can also be utilized for charging a battery. This integrated charging technology eliminates the on-board charger, leading to a significant reduction in the overall weight and...

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Bibliographic Details
Published in:IEEE transactions on energy conversion 2018-12, Vol.33 (4), p.2060-2069
Main Authors: Mukundan, Shruthi, Dhulipati, Himavarsha, Lai, Chunyan, Mukherjee, Kaushik, Tjong, Jimi, Kar, Narayan C.
Format: Article
Language:English
Subjects:
Bars
Batteries
Charging
Coils (windings)
Dampers
Demagnetization
Design optimization
Electric vehicles
Equivalent circuits
Evolutionary algorithms
Finite element method
Fuel consumption
Genetic algorithms
inductances
Integrated charging
magnetic circuit
Magnetic fields
Magnetism
Magnetomechanical effects
permanent magnet synchronous machine
Permanent magnets
Rotors
Shock absorbers
Stator windings
Synchronous machines
Torque
Traction
Voltage measurement
Weight
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Summary:The 3-phase windings of interior permanent magnet synchronous machines (IPMSMs) used in electric vehicles (EVs) for traction can also be utilized for charging a battery. This integrated charging technology eliminates the on-board charger, leading to a significant reduction in the overall weight and cost of the EV. However, during integrated charging, the induced magnetic fields across the IPMSM windings are unbalanced, which could lead to addition of harmonic current components at the battery side, demagnetization, noise, and vibrations. This paper provides a novel design solution by implementing asymmetrical damper bars in the IPMSM rotor to mitigate unbalanced magnetic fields during integrated charging, and, thus, overcome the aforementioned issues. However, the bars introduced could affect the useful torque production of the machine during traction. Therefore, a magnetic equivalent circuit model based differential evolutionary algorithm is proposed and implemented to optimize the IPMSM rotor structure with dampers to achieve balanced magnetic fields during integrated charging operation and satisfactory traction performance. A comprehensive performance analysis of the optimally designed traction IPMSM equipped with integrated charging capability under both operating conditions is presented in this paper using finite element analysis.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2018.2877104