Estimation Algorithm for Current and Temperature of Field Winding in Electrically Excited Synchronous Machines with High-Frequency Brushless Exciters
Artikel i vetenskaplig tidskrift, 2021

Electrically excited synchronous machines (EESMs) have become one of the potential alternatives to permanent magnet synchronous machines (PMSMs) in electric vehicles (EVs) to avoid rare-earth materials. Utilizing high-frequency brushless exciters for rotor excitation is a promising choice to reduce friction losses and maintenance effort and cost. However, with the usage of brushless exciters, the field current and temperature cannot be measured directly. In this paper, an algorithm is proposed to dynamically estimate the field current as well as the field winding temperature. The dc-link current is utilized as a feedback to correct the estimation. The performance of the estimation algorithm is initially evaluated in simulations and then verified by experimental measurements in a prototype. Based on the estimation algorithm, closed-loop control of the field current is developed and verified experimentally.

field excitation

electrically excited synchronous machines (eesms)

electric vehicles (evs)

wound field synchronous machines

estimation algorithm


Junfei Tang

Chalmers, Elektroteknik, Elkraftteknik

Yujing Liu

Chalmers, Elektroteknik, Elkraftteknik

Stefan Lundberg

Chalmers, Elektroteknik, Elkraftteknik

IEEE Transactions on Power Electronics

0885-8993 (ISSN) 19410107 (eISSN)

Vol. 36 3 3512-3523 9169840

Development of efficient and environmental friendly LONG distance powertrain for heavy dUty trucks aNd coaches

Europeiska kommissionen (EU) (EC/H2020/874972), 2020-01-01 -- 2023-06-30.

HipeDrive - Högpresterande drivlina för fullelektriska tunga lastbilar och premium personbilar

Energimyndigheten (50190-1), 2020-04-01 -- 2023-09-30.


Hållbar utveckling






Annan elektroteknik och elektronik



Mer information

Senast uppdaterat