Gianmario Pellegrino

Gianmario Pellegrino
Politecnico di Torino | polito · DENERG - PEIC (Power Electronics Innovation Center)

Professor

About

187
Publications
63,861
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
4,721
Citations
Citations since 2016
89 Research Items
3486 Citations
20162017201820192020202120220100200300400500600
20162017201820192020202120220100200300400500600
20162017201820192020202120220100200300400500600
20162017201820192020202120220100200300400500600
Additional affiliations
August 2013 - October 2013
University of Wisconsin–Madison
Position
  • Honorary Fellow

Publications

Publications (187)
Article
This article deals with the lookup table (LUT) less sensorless control of synchronous reluctance (SyR) machines at zero and low speeds, where LUT-less stands for avoiding the use of flux-map LUTs or other predetermined machine parameters. The new signal-injection-based control scheme called the locus of incremental saliency ratio tracking is presen...
Article
The automotive industry is in the midst of a historically disruptive revolution. The electrification of the vehicle propulsion system was initiated by the shared global need to address climate change and the pace of this revolution has picked up speed as customers become more aware and costs decrease. Whether it be through hybridization or full ele...
Article
This article proposes a new magnetic model self-identification technique for synchronous machines to build the flux-map look-up tables. Provided the shaft is free to turn, an alternating self-acceleration and deceleration sequence is envisaged for identification without a dedicated experimental rig or additional hardware. With respect to previous w...
Article
Full-text available
This paper presents a methodology for the efficiency maps evaluation of synchronous electric machines. The procedure is based on the manipulation of flux linkage, iron and PM loss maps obtained via 2D magneto-static Finite-Element Analysis. The paper thoroughly describes the procedure and its key computational steps, all referring to open-source Ma...
Article
Signal-injection sensorless control (SISC) for low speeds region are usually assisted with compensation techniques to support the heavy load operations beyond rated conditions. For the standard d-axis pulsating voltage injection, this paper analyzes the prospect of using $q$ -axis current-model flux instead of the q-axis current for decoupled pos...
Article
This paper reviews six fundamental-wave excitation sensorless techniques for synchronous machines reported in the literature. All the techniques rely on a hybrid flux observer scheme, combining the voltage and current models of the machine, and use the flux observer error signal to track the rotor phase angle and the rotational speed. A common math...
Conference Paper
Full-text available
Thanks to the heavy reduction of cost and volume, integrated On-Board Chargers (OBCs) represent an effective solution to provide a versatile and powerful charging system on board of electric and plug-in electric vehicles, combining the charging function with the traction drivetrain. Such integration foresees the use of the traction motor windings a...
Conference Paper
Full-text available
This paper presents a methodology for the efficiency maps evaluation of synchronous electric machines. The procedure is based on the manipulation of flux maps, iron loss and Permanent Magnet (PM) loss map obtained via 2D Finite Element Analysis (FEA). A step-by-step procedure is given, and made available to engineers in the form of open-source Matl...
Article
A novel Direct Flux Vector Control (DFVC) scheme is presented based on the real-time use of the motor small-signal model for optimal reference generation without pre-processed look-up tables (LUTs). The control scheme is valid for Reluctance- and PM-Synchronous machines. The stator flux magnitude and the load angle are the controlled variables and...
Article
Direct flux vector control (DFVC) has an unique advantage in facilitating flux-weakening operation due to the choice of controlled variables: stator flux linkage magnitude and torque producing current. However, the dynamics in stator flux oriented reference frame is heavily affected by the nonlinear cross-coupling between the two axes. This paper p...
Article
Accurate torque control is of interest in traction and other industrial applications, whose realization is challenged by parameters errors and temperature induced variations. This paper proposes a sensorless technique for resilient torque control in salient synchronous machines. The position observer is driven by the adaptive projection vector for...
Article
The concept of auxiliary flux vector is defined for the nonlinear magnetic model of a synchronous reluctance (SyR) machine. An auxiliary flux based position observer is developed to circumvent the stability problems of other schemes, notably active flux position observer, without compromising on the simplicity. Stability analysis and sensitivity to...
Conference Paper
Full-text available
This paper proposes a new design strategy for Synchronous Reluctance machines, with cooperative design in the two environments SyR-e and Motor-CAD. The paper proposes to use the open-source SyR-e for initial, equation based design of the machine. Then, the design is validated and refined in Motor-CAD, in multiple physical domains. This synergy comp...
Article
The paper presents a general projection vector framework for the analysis of flux and position observers applied to sensorless control of synchronous reluctance machines, with emphasis to parametric errors sensitivity. The stator resistance immunity property of Adaptive Projection vector for Position error estimation (APP) technique is demonstrated...
Article
Estimating the junction temperature of power electronic devices is of paramount importance for assuring the reliable operation of power converters. Wide bandgap devices, that allow extremely high-power density levels, make thermal management even more critical than before. Despite the efforts of the scientific community, this problem is far from be...
Article
Permanent magnet assisted synchronous reluctance (PM-SyR) motors often present relevant magnetic saturation, especially if overload capability is exploited. The knowledge of current-to-flux relationship is mandatory for proper motor control, and it becomes even more critical in the case of sensorless applications. Reliable standstill self-commissio...
Article
The paper presents a general framework valid for high frequency excitation based position observer for low speed sensorless control of synchronous reluctance machines. A finite control set model predictive control technique is proposed accordingly, exploiting the switching current ripple for position estimation. Position error due to cross-saturati...
Conference Paper
Full-text available
The electrification of light-duty vehicles is key to reducing emissions in urban areas. This paper aims at presenting the interim results of the European project FITGEN, granted under the H2020 LC-GV-01-2018 call and kicked-off in January 2019. The project will deliver an e-axle natively designed to fit a brand-independent A-segment fully electric...
Article
This paper investigates the accuracy of the estimation of efficiency maps for permanent magnet (PM) machines using the stator resistance, d- and q-axis flux-linkages versus the corresponding axis current and the iron loss versus speed characteristic. The ultimate goal is to apply this approach to experimental measurements but this paper performs in...
Article
Short-time thermal transient identification method was successfully adopted to evaluate the winding thermal parameters of induction motors for industry applications. In this work, the modeling approach and the identification methodology are extended to the more sophisticated case of multiple threephase machines. The generalized model takes into con...
Article
The paper presents a mathematical framework for the design and analysis of position observers for sensorless control of synchronous reluctance machines. The approach expresses the observer error via a generalized projection vector. Moreover, the proposed framework includes an improved inductance model to account for the position error induced induc...
Article
The Synchronous Reluctance (SyR) machine is an attractive substitute of induction motors and synchronous PM motors thanks to its high efficiency and low cost of manufacturing. Yet, its design cannot be considered a mature topic, especially for what concerns the rotor geometry. Design equations were proposed for SyR machines by different authors, re...
Article
This paper deals with stator-flux-oriented control of permanent-magnet (PM) synchronous motors and synchronous reluctance motors (SyRMs). The variables to be controlled are the stator-flux magnitude and the torque-producing current component, whose references are easy to calculate. However, the dynamics of these variables are nonlinear and coupled,...
Article
Full-text available
Synchronous reluctance machines are a high-efficiency alternative to induction motors for variable-speed applications. To mitigate the well-known downside of their lower power factor, permanent-magnet-assisted topologies, in which either rare-earth or ferrite magnets are inserted into the rotor in suitable quantities, are often adopted. The design...
Article
Full-text available
The ubiquitous diffusion of Power Electronic Converters (PECs) in many fields of application including traction and energy conversion suggests the possibility of new and better integration of advanced power conversion and Information and Communication Technology (ICT) services. This work investigates the possible advancements in the use of optical...
Article
The paper deals with the accurate flux map modeling of synchronous reluctance motors, using finite element analyses. Non-negligible discrepancies were initially observed by comparing two-dimensional (2-D) finite element method (FEM) simulation results with measured flux maps of real machines. Conversely, the three-dimensional (3-D) FEM-based flux m...
Preprint
The ubiquitous diffusion of Power Electronic Converters (PECs) in many fields of application including traction and energy conversion is suggesting the possibility of new and better integration of advanced power conversion and ICT services. This work investigates the possible advancements in the use of optical fibers for control of PECs, using Plas...
Article
The measurement of synchronous inductances for three-phase permanent magnet machines is usually performed by means of off-line tests connecting the stator windings in different single-phase configurations. A test campaign conducted on different machines has demonstrated that the inductance measurement depends on both the stator winding connection s...
Article
The ability to monitor temperature variations during the actual operation of power modules is key to reliability investigations and the development of lifetime prediction strategies. This paper proposes an original solution, specifically devised with novel fast-switching silicon carbide (SiC) power MOSFETs in mind. The results show ability to track...
Article
Full-text available
In high-performance control of ac machines through variable frequency drives, the knowledge of machine parameters plays a decisive role. The accuracy with which machine parameters can be known is directly related to the time and effort put in testing and commissioning process. In the ever-demanding industrial environments, the time spent on paramet...
Article
Full-text available
The compensation of converters’ nonlinear voltage error is crucial in encoder-less control of ac motor drives. In this paper, a new self-commissioning and compensation method is proposed for matrix converters (MC). Similar to what done in the past for voltage source inverters, the MC voltage error is identified before the drive start and stored in...
Article
Full-text available
Sensorless control of synchronous reluctance motors (SyRMs) relies on the knowledge of the machine current-to-flux maps. Previous work demonstrated the feasibility of sensorless identification of the flux maps, performed by exciting the machine with square-wave voltage pulses at standstill, and without the need of rotor locking. The rotor position...
Article
This paper deals with real-time estimation of the junction temperature of SiC power mosfets. The junction temperature of a device with four-switch module is estimated in real-time by measuring its current and on-state voltage V <sub xmlns:xlink="http://www.w3.org/1999/xlink">ON</sub> at each switching period and entering the temperature in the look...
Conference Paper
Full-text available
The design of competitive and efficient electrical machines is to date an open and fascinating engineering challenge. Electrical machines involve a variety of transversal aspects including multiple physical fields, cost and availability of materials and ease of manufacturing. Design goals are also numerous: efficiency, cost, minimum weight, safe op...
Conference Paper
This paper presents a sensorless control technique based on direct flux vector control (DFVC) method for synchronous reluctance (SyR) motor drives fed by a three-phase to three-phase matrix converter (MC). Rotor position is estimated based on active flux (AF) concept down to 50 [rpm]. Furthermore, the effect of nonlinear voltage errors of the MC is...
Conference Paper
The paper deals with the accurate flux map modeling of synchronous reluctance motors through finite element analyses. By comparing 2D-FEM simulations results with measured flux maps on real machines, non-negligible discrepancies were initially observed, in particular under heavy saturation and cross-saturation conditions. Conversely, the 3D FEM-bas...
Article
This paper proposes a sensorless control scheme for synchronous reluctance (SyR) motor drives based on the direct flux vector control (DFVC) method. The control operates in stator flux oriented coordinates, using constant switching frequency. A hybrid position and speed observer is proposed, based on the combination of the active flux concept and h...
Article
This paper presents a novel approach in the modeling of efficiency maps for electrical machines. It is based on using the sum of terms in the form of kmnT <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</sup> ω <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xl...
Article
This paper proposes a sensorless direct flux vector control scheme for synchronous reluctance motor drives. Torque is controlled at constant switching frequency, via the closed loop regulation of the stator flux linkage vector and of the current component in quadrature with it, using the stator flux oriented reference frame. A hybrid flux and posit...
Article
Full-text available
This paper presents a design environment for permanent-magnet synchronous motors (PMSMs). Two design examples for electric vehicle (EV) traction are presented: one interior PM machine of the PM-assisted synchronous reluctance (PM-SyR) type and one concentrated-winding surface-mounted PM motor (CW-SPM). The parametric design software used in the pap...
Article
This paper proposes a standstill method for identification of the magnetic model of synchronous reluctance motors (SyRMs). The saturation and cross-saturation effects are properly taken into account. The motor is fed by an inverter with a short sequence of bipolar voltage pulses that are first applied on the rotor d- and q-axes separately and then...
Conference Paper
Full-text available
This paper proposes the comparison among different sensorless position estimation strategies suitable for permanent magnet assisted synchronous reluctance machine drives. A machine of such type was designed and optimized aiming at improving its sensorless performance, besides minimizing the torque ripple and maximizing the power factor. Different s...