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Analysis of a deeply saturated sensorless PMSynRel drive for an automotive application
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.ORCID iD: 0000-0002-6283-7661
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.ORCID iD: 0000-0002-0744-2552
2011 (English)In: Proceedings of the 2011-14th European Conference on Power Electronics and Applications (EPE 2011), IEEE conference proceedings, 2011, 1-10 p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents an method of mapping feasible region for a sensorless control PMSynRel drive using the resulting position error signal. Thanks to the rotor anisotropy, the rotor position can be detected at low speeds by means of injecting high frequency voltage, either a pulsating voltage vector in the estimated synchronous frame or a rotating vector in the stator frame, on top of the fundamental excitation. However, the resulting position error signal is degraded and distorted by magnetic saturation (including crosssaturation) and spatial inductance harmonics. Therefore, the feasible region is used to find the stable operating points. Instead of mapping the inductances, which is time consuming, position error signal is used to map the feasible sensorless control region. A prediction method of the maximum position estimation error is also presented by taking the spatial inductance harmonics into account. After that, some techniques are presented to compensate the cross-saturation and slot harmonic effects in order to improve the sensorless control quality. Additionally, it is shown how saturation in the rotor bridges affects the initial polarity detection required during startup.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2011. 1-10 p.
Keyword [en]
Sensorless control, Permanent magnet motor, Synchronous motor, Hybrid Electric
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-101410ISI: 000308003503082Scopus ID: 2-s2.0-80053544521ISBN: 978-1-61284-167-0 (print)OAI: oai:DiVA.org:kth-101410DiVA: diva2:547529
Conference
Power Electronics and Applications (EPE 2011), Aug. 30 2011-Sept. 1 2011
Funder
StandUp
Note

QC 20121016

Available from: 2012-10-16 Created: 2012-08-28 Last updated: 2014-12-10Bibliographically 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.
Series
TRITA-EE, ISSN 1653-5146 ; 2013:046
Keyword
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
Identifiers
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)
Opponent
Supervisors
Note

QC 20140114

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

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Wallmark, OskarLeksell, Mats

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