Citation:
C-F Wang, J-X Shen, PC-K Luk, et al., (2011) Design issues of an IPM motor for EPS. COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, Volume 31, Issue 1, 2011, pp. 71-87
Abstract:
In electric power steering (EPS), permanent magnet (PM) brushless ac (BLAC)
motors offer distinct advantages over other electric motor types in terms torque
smoothness, reliability and efficiency. The design procedure of an interior
permanent magnet (IPM) motor used in EPS is presented in this paper. The
requirements of the steering system are first introduced, and the machine's
specifications are then derived. Critical issues which have considerable impacts
on the machine's performance, such as operation mode, rotor structure and slot/
pole combination, are analyzed. Subsequently, a 12-slot/10-pole sinusoidally
excited IPM machine with concentrated windings is proposed and optimized based
on finite element analysis (FEA) modelling. The losses and efficiency are then
computed. Performance predictions from the FEA results confirm all the
requirements are met or exceeded. A prototype motor has been built for
validation.
