Affiliations: [a] School of Electrical Engineering and Computer Science,
Seoul National University, Seoul, Korea
Correspondence:
[*]
Corresponding author: Hyun-Kyo Jung, Building 301-613, School
of Electrical Engineering, Seoul National University, Shillim-dong, Kwanak-gu,
Seoul, 151-742, Korea. Tel.: +82 2 880 7262; Fax: +82 2 878 1452; E-mail: underdamp@snu.ac.kr
Abstract: This paper proposes a rotor-design strategy of interior permanent
magnet synchronous machine (IPMSM) considering various design constraints for a
fuel-cell electric vehicle. The conventional process in the rotor design only
considers the magnitude of the iron loss or the magnet loss while neglecting
the loss distributions in the rotor core. This approach results in a design
where losses are accumulated on a localized region in the rotor core,
especially in the case of IPMSM with a fractional number of slots per pole.
This can cause significant irreversible demagnetization of the permanent
magnets since the rotor core usually suffers from poor heat transfer. The
proposed strategy targets this problem by focusing on the loss distributions
according to driving condition. In addition, it offers a parallel approach
where mechanical stress analysis is combined with the rotor design process in
order to guarantee mechanical strength by centrifugal force at maximum speed.
The validity of proposed method was verified by comparing simulation result
using the finite element method with experimental data.
Keywords: Demagnetization, fuel cell electric vehicle (FCEV), interior permanent magnet synchronous motor (IPMSM), rotor
