Estimation Algorithm for Current and Temperature of Field Winding in Electrically Excited Synchronous Machines with High-Frequency Brushless Exciters
Journal article, 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, Electrical Engineering, Electric Power Engineering

Yujing Liu

Chalmers, Electrical Engineering, Electric Power Engineering

Stefan Lundberg

Chalmers, Electrical Engineering, Electric Power Engineering

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

European Commission (EC) (EC/H2020/874972), 2020-01-01 -- 2023-06-30.

HipeDrive - Högpresterande drivlina för fullelektriska tunga lastbilar och premium personbilar

Swedish Energy Agency (50190-1), 2020-04-01 -- 2023-09-30.

Driving Forces

Sustainable development

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Subject Categories

Control Engineering

Signal Processing

Other Electrical Engineering, Electronic Engineering, Information Engineering



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