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Evaluation of a Multiphase Drive System in EV and HEV Applications
KTH, School of Electrical Engineering (EES), Electric power and energy systems. (power electronics)ORCID iD: 0000-0002-6633-8384
KTH, School of Electrical Engineering (EES), Electric power and energy systems. (power electronics)ORCID iD: 0000-0002-8565-4753
KTH, School of Electrical Engineering (EES), Electric power and energy systems.ORCID iD: 0000-0002-4534-921X
KTH, School of Electrical Engineering (EES), Electric power and energy systems.ORCID iD: 0000-0002-6283-7661
2015 (English)In: 2015 IEEE INTERNATIONAL ELECTRIC MACHINES & DRIVES CONFERENCE (IEMDC), Institute of Electrical and Electronics Engineers (IEEE), 2015, 941-945 p.Conference paper, Published paper (Refereed)
Abstract [en]

Multiphase machine drive systems have been applied in many electric propulsion fields such as aerospace and electric vehicle applications. With the development of SiC semiconductors, its superior characteristic makes compact multiphase converters possible. Moreover, by using a single chip in each switch, problems caused by an uneven current split between paralleled devices can be avoided. This paper presents a performance evaluation for a 50 kW multiphase EV/HEV drive system with 1.2 kV SiC MOSFETs. Power loss calculation, cost comparison and system simulation are provided to illustrate the feasibility of the proposed concept.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2015. 941-945 p.
Keyword [en]
Circuit simulation, electric vehicles, machine vector control, motor drives, permanent magnet machines, power dissipation, semiconductor devices
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-193300DOI: 10.1109/IEMDC.2015.7409174ISI: 000380534300138Scopus ID: 2-s2.0-84965158304ISBN: 978-1-4799-7941-7 (print)OAI: oai:DiVA.org:kth-193300DiVA: diva2:1033227
Conference
IEEE International Electric Machines and Drives Conference, MAY 10-13, 2015, Coeur dAlene, ID
Note

QC 20161006

Available from: 2016-10-06 Created: 2016-09-30 Last updated: 2017-05-30Bibliographically approved
In thesis
1. Integrated Compact Drives for Electric and Hybrid Electric Vehicles
Open this publication in new window or tab >>Integrated Compact Drives for Electric and Hybrid Electric Vehicles
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

To develop more competitive solutions, one of the trends in the development of drive systems for electric and hybrid electric vehicles (EVs/HEVs) is to integrate the power electronic converter and the electric motor. This thesis aims to investigate the performance and the operation of modular converters in integrated motor drive systems for EVs/HEVs.

In the first part, the concept of integrated modular motor drive systems for EVs/HEVs is introduced. Three suitable modular converter topologies, namely, the stacked polyphase bridges (SPB) converter, the parallel-connected polyphase bridges (PPB) converter and the modular high frequency (MHF) converter, are evaluated and compared with conventional electric drives in terms of power losses, energy storage requirements, and semiconductor costs.

In the second part of the thesis, the harmonic content of the dc-link current of the SPB converter is analyzed. By adopting an interleaving modulation the size of the dc-link capacitor can be reduced without increasing the switching frequency, which is beneficial for achieving a compact integrated system. This method allows for around 80% reduction of the dc-link capacitance for vehicle drives, resulting in a significant size reduction of the power converter and improved integration.

Finally, a communication-based distributed control system for the SPB converter is presented. The communication delay arising from the serial communication is inevitable, thus a timing analysis is also presented. It has been found that stability is maintained even when the baud rate of the SPI communication is lower than 1 Mbps, indicating that other communication protocols with lower bandwidths can also be adopted for this topology.

The analytical investigations provided in this thesis are validated by experiments on a four-submodule laboratory prototype. Experimental results verify the correctness of the theoretical analysis, as well as the dynamic performance of the distributed control system.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2016. 123 p.
Series
TRITA-EE, ISSN 1653-5146
Keyword
distributed control, electric vehicle, energy storage capability, integrated motor drive, modular converter, modulation, power losses, stacked polyphase bridges converter, switching frequency
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-196732 (URN)978-91-7729-196-1 (ISBN)
Public defence
2016-12-19, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20161121

Available from: 2016-11-21 Created: 2016-11-18 Last updated: 2016-11-21Bibliographically approved
2. On Electric Machinery for Integrated Motor Drives in Automotive Applications
Open this publication in new window or tab >>On Electric Machinery for Integrated Motor Drives in Automotive Applications
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Compact, electric drives for automotive traction applications represent animportant enabler towards realizing tomorrow’s fossil free transport solutions.One attractive solution is to integrate the power electronic converter withits associated electric machinery into a single unit. This thesis, along withits appended papers, considers design and analysis of electric machinery forintegrated electric drives intended for automotive applications. Particular focusis put on permanent-magnet synchronous machines (PMSMs) with interiormountedpermanent magnets combined with modular converter topologies.In the first part of the thesis, different converter concepts and windingarrangements suitable for an integrated drive are reviewed. Compared to theconventional solution utilizing a three-phase two-level converter, a compactintegration can be implemented by physically splitting the converter and itsassociated dc-link capacitor into a number of converter submodules. Moreover,a modular concept also enables a certain level of fault tolerance.In the second part of the thesis, fractional-slot concentrated windings(FSCWs) are analyzed. First, a review for how to determine suitable slot, pole,and phase combinations is identified considering mainly the winding factor forthe main harmonic and the associated rotor losses. Then, integrated modularconverter concepts and associated winding configurations are considered andslot, pole and phase combinations that also comply with the consideredmodular converters are proposed. Further, two possible winding arrangementssuitable for the stacked polyphase bridges (SPB) and the parallel polyphasebridges (PPB) type converter are compared with respect to torque duringpost-fault operation in the event of failure of a single converter submodule.In the third part, an iterative process adopting both finite element analysisand analytical techniques is proposed for the design of PMSMs with interiormountedpermanent magnets and FSCWs. The resulting machine designsillustrate tradeoffs in terms of fault tolerance, power factor, torque density,and potential for field-weakening operation. From a given set of specifications,an experimental prototype is also designed and built.Finally, since a FSCW generally results in a large harmonic content ofthe resulting flux-density waveform, models for predicting eddy-current lossesin the permanent magnets are analyzed and compared. Particularly, modelsadopting different formulations to the Helmholtz equation to solve for the eddycurrents are compared to a simpler model relying on an assumed eddy-currentdistribution. Boundaries in terms of magnet dimensions and angular frequencyare also identified in order to aid the machine designer whether the mostsimple loss model is applicable or not. With a prediction of the eddy-currentlosses in the permanent magnets together with a corresponding thermal model,predicted volumetric loss densities exemplified for combinations of slot andpole numbers common in automotive applications are presented along withthe associated thermal impact.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 55 p.
Series
TRITA-EE, ISSN 1653-5146 ; 2017:036
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-207942 (URN)978-91-7729-381-1 (ISBN)
Public defence
2017-06-14, V1, Teknikringen 76, Stockholm, 10:15
Opponent
Supervisors
Note

QC 20170530

Available from: 2017-05-30 Created: 2017-05-29 Last updated: 2017-05-30Bibliographically approved

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