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Torque dynamics in sensorless PMSM drives
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.ORCID iD: 0000-0002-6283-7661
2012 (English)In: Electrical Machines (ICEM), 2012 XXth International Conference on, IEEE , 2012, 2273-2278 p.Conference paper (Refereed)
Abstract [en]

In automotive drivetrains used in hybrid electric vehicles, the transmission connecting the electric machine(s) and the combustion engine often introduce non linear phenomena such as gear play and backlash. These non-ideal effects can result in drivetrain oscillations which, in turn, can be mitigated by a controller manipulating the torque reference of the electric machine. If a permanent-magnet synchronous machine (PMSM) is operated without using a position sensor (sensorless), the resulting torque dynamics (from the torque reference to the shaft torque) is different compared to the situation when the rotor position is known. Hence, it is desirable to know the torque dynamics for PMSMs operating sensorless when the drivetrain torque oscillation controller is tuned. This paper presents a number of models, evaluated using simulations, describing the torque dynamics of PMSM drives with and without the use of a position sensor.

Place, publisher, year, edition, pages
IEEE , 2012. 2273-2278 p.
Keyword [en]
current control, Electric drives, field-oriented control, permanent-magnet synchronous motors, sensorless control
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
SRA - Energy
URN: urn:nbn:se:kth:diva-104525DOI: 10.1109/ICElMach.2012.6350198ISI: 000333806702033ScopusID: 2-s2.0-84870823577ISBN: 978-146730142-8OAI: diva2:564978
20th International Conference on Electrical Machines, ICEM 2012; Marseille; 2 September 2012 through 5 September 2012

QC 20130122

Available from: 2012-11-05 Created: 2012-11-05 Last updated: 2014-10-08Bibliographically approved
In thesis
1. Analysis and Control Aspects of a PMSynRel Drive in a Hybrid Electric Vehicle Application
Open this publication in new window or tab >>Analysis and Control Aspects of a PMSynRel Drive in a Hybrid Electric Vehicle Application
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis deals withmodeling and control of an electric drive equipped with a permanentmagnet assisted synchronous reluctance (PMSynRel) machine for a plug-in hybrid electric vehicle application.

In the first part of the thesis, a special use of the PMSynRel machine in consideration, known as an integrated charger concept, is investigated. The integrated charger feature allows using the PMSynRel machine as a part of the vehicle’s on-board charging system when charging the battery from the grid. A finite-element based analysis is performed providing important insights into the machine operation during the charging process. Dynamic models are developed that facilitate the controller development and the estimation of the efficiency during charging.

In the second part of the thesis, position sensorless control of the PMSynRel drive when applied in an automotive application is considered and analyzed thoroughly. First, a fundamental-excitation based rotor-position estimation technique is investigated. The study shows that the impact of current dynamics on the resulting torque dynamics has to be considered in some very demanding applications. Second, focus is put on signalinjection based sensorless control methods. Impacts of nonlinearities, such as magnetic saturation, cross-saturation and inductance spatial harmonics, on sensorless control performance are investigated and methods to improve the sensorless control quality are summarized and presented. An approach to determine the feasible region for operating sensorless at low-speeds without directly measuring the differential inductances is proposed. For the PMSynRel drive in consideration, the achievable maximum torque is limited when operating sensorless following the maximum-torque-per-ampere (MTPA) current reference trajectory at low-speeds. An optimization approach is therefore proposed which extends the output torque when operating sensorless while still maintaining a relatively high efficiency. To initialize the sensorless control correctly from standstill, the impact of the saturated magnetic bridges in the rotor is also investigated.

Finally, torsional drive-train oscillations and active damping schemes are considered. An off-vehicle setup for implementing and evaluating different active damping schemes is proposed. Of particular interest for sensorless operation in automotive applications, the impact of slow speed estimation on the possibility to achieve good active damping control is investigated and a design approach that allows the implementation of an active damping scheme using estimated speed is suggested.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. x, 60 p.
TRITA-EE, ISSN 1653-5146 ; 2013:046
Active damping control, electric drive, electric vehicle, hybrid electric vehicle, integrated charger, permanent-magnet assisted synchronous reluctance machine, position estimation, sensorless control
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
urn:nbn:se:kth:diva-139592 (URN)978-91-7501-966-6 (ISBN)
Public defence
2014-01-22, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)

QC 20140114

Available from: 2014-01-15 Created: 2014-01-15 Last updated: 2014-01-15Bibliographically approved

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