Design and Experimental Verification of a 48 V 20 kW Electrically Excited Synchronous Machine for Mild Hybrid Vehicles
Paper in proceeding, 2018

Electrically Excited Synchronous Machines (EESM) have become an attractive solution to Electric Vehicles (EV). This work aims to develop a 48 V 20 kW EESM for mild hybrid vehicles (MHV), which prioritizes torque production ability during start-up. An H-bridge converter including an H-bridge inverter, a rotating transformer and a diode rectifier is employed for magnetic field excitation on the rotor side. Efforts have been made to maximize torque production and to estimate field current and field winding temperature without physical contact. The EESM is manufactured after having been designed with the help of FEM, and then verified by practical experiments. The back-EMF waveforms, flux linkage distributions and the produced torque levels from the experiments are compared with the FEM results. Field current estimation by DC-link current of the excitation H-bridge converter is developed, and solutions for field winding temperature estimation have been investigated as well.

Electric machines

electrically excited synchronous machine

electric vehicles

mild hybrid


Junfei Tang

Chalmers, Electrical Engineering, Electric Power Engineering

Yujing Liu

Chalmers, Electrical Engineering, Electric Power Engineering

International Conference on Electrical Machines

2381-4802 (ISSN)

9781538624777 (ISBN)

2018 XIII International Conference on Electrical Machines (ICEM)
Alexandroupoli, Greece,

Variable Flux Machine for electric vehicles

Swedish Energy Agency (41396-1), 2016-04-01 -- 2019-03-31.

Driving Forces

Sustainable development

Areas of Advance



Subject Categories

Other Electrical Engineering, Electronic Engineering, Information Engineering





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