Vancini, Luca
(2022)
Multi-phase electric drives for mobility, [Dissertation thesis], Alma Mater Studiorum Università di Bologna.
Dottorato di ricerca in
Automotive per una mobilità intelligente, 34 Ciclo. DOI 10.48676/unibo/amsdottorato/10297.
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Abstract
Multi-phase electrical drives are potential candidates for the employment in innovative electric vehicle
powertrains, in response to the request for high efficiency and reliability of this type of application.
In addition to the multi-phase technology, in the last decades also, multilevel technology has been
developed. These two technologies are somewhat complementary since both allow increasing the power
rating of the system without increasing the current and voltage ratings of the single power switches of the
inverter.
In this thesis, some different topics concerning the inverter, the motor and the fault diagnosis of an electric
vehicle powertrain are addressed. In particular, the attention is focused on multi-phase and multilevel
technologies and their potential advantages with respect to traditional technologies.
First of all, the mathematical models of two multi-phase machines, a five-phase induction machine and an
asymmetrical six-phase permanent magnet synchronous machines are developed using the Vector Space
Decomposition approach.
Then, a new modulation technique for multi-phase multilevel T-type inverters, which solves the voltage
balancing problem of the DC-link capacitors, ensuring flexible management of the capacitor voltages, is
developed. The technique is based on the proper selection of the zero-sequence component of the
modulating signals.
Subsequently, a diagnostic technique for detecting the state of health of the rotor magnets in a six-phase
permanent magnet synchronous machine is established. The technique is based on analysing the
electromotive force induced in the stator windings by the rotor magnets.
Furthermore, an innovative algorithm able to extend the linear modulation region for five-phase inverters,
taking advantage of the multiple degrees of freedom available in multi-phase systems is presented.
Finally, the mathematical model of an eighteen-phase squirrel cage induction motor is defined. This activity
aims to develop a motor drive able to change the number of poles of the machine during the machine
operation.
Abstract
Multi-phase electrical drives are potential candidates for the employment in innovative electric vehicle
powertrains, in response to the request for high efficiency and reliability of this type of application.
In addition to the multi-phase technology, in the last decades also, multilevel technology has been
developed. These two technologies are somewhat complementary since both allow increasing the power
rating of the system without increasing the current and voltage ratings of the single power switches of the
inverter.
In this thesis, some different topics concerning the inverter, the motor and the fault diagnosis of an electric
vehicle powertrain are addressed. In particular, the attention is focused on multi-phase and multilevel
technologies and their potential advantages with respect to traditional technologies.
First of all, the mathematical models of two multi-phase machines, a five-phase induction machine and an
asymmetrical six-phase permanent magnet synchronous machines are developed using the Vector Space
Decomposition approach.
Then, a new modulation technique for multi-phase multilevel T-type inverters, which solves the voltage
balancing problem of the DC-link capacitors, ensuring flexible management of the capacitor voltages, is
developed. The technique is based on the proper selection of the zero-sequence component of the
modulating signals.
Subsequently, a diagnostic technique for detecting the state of health of the rotor magnets in a six-phase
permanent magnet synchronous machine is established. The technique is based on analysing the
electromotive force induced in the stator windings by the rotor magnets.
Furthermore, an innovative algorithm able to extend the linear modulation region for five-phase inverters,
taking advantage of the multiple degrees of freedom available in multi-phase systems is presented.
Finally, the mathematical model of an eighteen-phase squirrel cage induction motor is defined. This activity
aims to develop a motor drive able to change the number of poles of the machine during the machine
operation.
Tipologia del documento
Tesi di dottorato
Autore
Vancini, Luca
Supervisore
Co-supervisore
Dottorato di ricerca
Ciclo
34
Coordinatore
Settore disciplinare
Settore concorsuale
Parole chiave
Multi-phase, Multilevel, Vehicle Powertrains, Fault-tolerant
URN:NBN
DOI
10.48676/unibo/amsdottorato/10297
Data di discussione
27 Giugno 2022
URI
Altri metadati
Tipologia del documento
Tesi di dottorato
Autore
Vancini, Luca
Supervisore
Co-supervisore
Dottorato di ricerca
Ciclo
34
Coordinatore
Settore disciplinare
Settore concorsuale
Parole chiave
Multi-phase, Multilevel, Vehicle Powertrains, Fault-tolerant
URN:NBN
DOI
10.48676/unibo/amsdottorato/10297
Data di discussione
27 Giugno 2022
URI
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