This page has only limited features, please log in for full access.
Nowadays, high expectations are set for a digitally enabled circular economy (CE), to enhance resource efficiency. Tracing, tracking, and storing information is most important for this. In this paper, the application of Internet of Things (IoT) and Distributed Ledger Technology (Blockchain) are hence discussed by presenting the case of professional Electrical and Electronic Equipment (EEE) in Italy. Within the context of CE, prevention of electronic waste (WEEE) is extremely relevant as it is a fast-growing waste stream, and the products contain environmentally damaging substances as well as valuable and rare materials. The use of a proper combination of IoT and blockchain can help the producers to keep control on products until EEE end-of-life, while promoting CE strategies and supporting decision-making. Based on the outcomes of five interviews conducted in 2019 to companies of the EEE sector, potential improvements in the EEE end-of-use management are discussed. After providing the definition of requirements for both the technical solution and its testing are provided, three solution variations and the related business models are created and presented, as well as considerations on their environmental and economic impacts. The study shows how digital technologies can support the appropriate and circular management of EEE products and WEEE.
Chiara Magrini; Jana Nicolas; Holger Berg; Alberto Bellini; Enrico Paolini; Nazarena Vincenti; Luca Campadello; Alessandra Bonoli. Using Internet of Things and Distributed Ledger Technology for Digital Circular Economy Enablement: The Case of Electronic Equipment. Sustainability 2021, 13, 4982 .
AMA StyleChiara Magrini, Jana Nicolas, Holger Berg, Alberto Bellini, Enrico Paolini, Nazarena Vincenti, Luca Campadello, Alessandra Bonoli. Using Internet of Things and Distributed Ledger Technology for Digital Circular Economy Enablement: The Case of Electronic Equipment. Sustainability. 2021; 13 (9):4982.
Chicago/Turabian StyleChiara Magrini; Jana Nicolas; Holger Berg; Alberto Bellini; Enrico Paolini; Nazarena Vincenti; Luca Campadello; Alessandra Bonoli. 2021. "Using Internet of Things and Distributed Ledger Technology for Digital Circular Economy Enablement: The Case of Electronic Equipment." Sustainability 13, no. 9: 4982.
The request for high efficiency motor paves the way for the replacement of induction motors with permanent magnet synchronous motors. Although the efficiency is increased, for medium and high power, the current ripple causes significant additional losses in the magnet and lamination; and, high temperature can lead to demagnetization. In this paper, a new rotor topology is proposed and compared to a traditional surface permanent magnet rotor to reduce the magnet losses and protect them from demagnetization. A reference surface permanent magnet machine is compared with the proposed one in terms of performance and magnet losses. Both analytical and experimental analysis are carried out and discussed.
Claudio Bianchini; Ambra Torreggiani; Matteo Davoli; Alberto Bellini. Design of Low-Cost Synchronous Machine to Prevent Demagnetization. Energies 2020, 13, 3566 .
AMA StyleClaudio Bianchini, Ambra Torreggiani, Matteo Davoli, Alberto Bellini. Design of Low-Cost Synchronous Machine to Prevent Demagnetization. Energies. 2020; 13 (14):3566.
Chicago/Turabian StyleClaudio Bianchini; Ambra Torreggiani; Matteo Davoli; Alberto Bellini. 2020. "Design of Low-Cost Synchronous Machine to Prevent Demagnetization." Energies 13, no. 14: 3566.
In this paper a dual-three phase synchronous reluctance machine is optimized for fault-tolerant applications. The main objective of such a design is improving the fault-tolerant capability by means of a proper motor geometry and winding arrangement paying attention to the torque density, torque ripple, mutual magnetic coupling and the maximum short circuit currents in several operating conditions. Finally, a prototype is manufactured and tested in order to validate the simulation predictions yielding good results.
Cristian Babetto; Nicola Bianchi; Ambra Torreggiani; Claudio Bianchini; Matteo Davoli; Alberto Bellini. Optimal Design and Experimental Validation of a Synchronous Reluctance Machine for Fault-Tolerant Applications. 2019 IEEE Energy Conversion Congress and Exposition (ECCE) 2019, 4880 -4887.
AMA StyleCristian Babetto, Nicola Bianchi, Ambra Torreggiani, Claudio Bianchini, Matteo Davoli, Alberto Bellini. Optimal Design and Experimental Validation of a Synchronous Reluctance Machine for Fault-Tolerant Applications. 2019 IEEE Energy Conversion Congress and Exposition (ECCE). 2019; ():4880-4887.
Chicago/Turabian StyleCristian Babetto; Nicola Bianchi; Ambra Torreggiani; Claudio Bianchini; Matteo Davoli; Alberto Bellini. 2019. "Optimal Design and Experimental Validation of a Synchronous Reluctance Machine for Fault-Tolerant Applications." 2019 IEEE Energy Conversion Congress and Exposition (ECCE) , no. : 4880-4887.
Electrical machines are wide spread because of their intrinsic robustness, versatility and reduced impact on energy and resources. Recently, the demand has focused on specific features: compatibility with power converters and fault tolerance. In fact, a wide range of applications require variable speed drives and high rejection of faults, i.e. safe operation also for non-critical applications. Here, a dual three-phase stator configuration is used, and a novel method for stator fault detection is presented. This method is based on reactive power measurements from both three-phase systems. A differential diagnostic index is defined, that can be used to detect effectively stator faults, isolating them from torque oscillations, load unbalances or other pitfalls.
Claudio Bianchini; Ambra Torreggiani; Matteo Davoli; Alberto Bellini; Cristian Babetto; Nicola Bianchi. Stator fault diagnosis by reactive power in dual three-phase reluctance motors. 2019 IEEE 12th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED) 2019, 251 -256.
AMA StyleClaudio Bianchini, Ambra Torreggiani, Matteo Davoli, Alberto Bellini, Cristian Babetto, Nicola Bianchi. Stator fault diagnosis by reactive power in dual three-phase reluctance motors. 2019 IEEE 12th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED). 2019; ():251-256.
Chicago/Turabian StyleClaudio Bianchini; Ambra Torreggiani; Matteo Davoli; Alberto Bellini; Cristian Babetto; Nicola Bianchi. 2019. "Stator fault diagnosis by reactive power in dual three-phase reluctance motors." 2019 IEEE 12th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED) , no. : 251-256.
The request for high efficiency motor opens the possibility of substituting induction motors with more efficient permanent magnet synchronous motors. For medium and high power, the current ripple causes significant additional losses in the magnet and lamination and correlated demagnetization issues of the rotor permanents magnets due to high temperature. In this paper a new rotor topology is proposed and compared to a traditional surface permanent magnet rotor to reduce the magnet losses and protect them from demagnetization. A reference surface permanent magnet machine is compared with the proposed one in terms of performance and magnet losses. Both analytical and experimental analysis are carried out and shown in the following
Claudio Bianchini; Ambra Torreggiani; Matteo Davoli; Danilo David; Alberto Bellini; Andrea Formentini. Demagentization Issues in Low Cost Synchronous Machine. 2019 IEEE 12th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED) 2019, 82 -87.
AMA StyleClaudio Bianchini, Ambra Torreggiani, Matteo Davoli, Danilo David, Alberto Bellini, Andrea Formentini. Demagentization Issues in Low Cost Synchronous Machine. 2019 IEEE 12th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED). 2019; ():82-87.
Chicago/Turabian StyleClaudio Bianchini; Ambra Torreggiani; Matteo Davoli; Danilo David; Alberto Bellini; Andrea Formentini. 2019. "Demagentization Issues in Low Cost Synchronous Machine." 2019 IEEE 12th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED) , no. : 82-87.
Surface permanent-magnet machines are widely used in different applications, from industrial automation to home appliance and electrical traction. Among any possible machine topology, the fractional-slot surface permanent-magnet one has gained increasing importance, because of its high torque density, low cogging torque, extended flux weakening capability and high efficiency. In addition, fractional-slot machines are attractive for tooth concentrated windings, which allow some optimized manufacturing solutions such as modular stator tooth and high slot filling factor, which result in copper volume reduction; cost reduction, and lower stator parasitic resistances. The slot–pole combination is one of the most important design parameter and, as shown in this paper, it affects performances and the robustness of the machine with respect to the manufacturing imperfections. In the literature, slot–pole combinations are optimized at design phase by finite-element analysis relying on a healthy machine model. The original contribution of this paper is a design for reliability method that models manufacturing defects and includes them at design phase in the optimization process of slot–pole combinations. A method is presented that allows defining the optimal design parameters for maximum performances and robustness towards unavoidable imperfections caused by tolerances of the manufacturing process.
Ambra Torreggiani; Claudio Bianchini; Matteo Davoli; Alberto Bellini. Design for Reliability: The Case of Fractional-Slot Surface Permanent-Magnet Machines. Energies 2019, 12, 1691 .
AMA StyleAmbra Torreggiani, Claudio Bianchini, Matteo Davoli, Alberto Bellini. Design for Reliability: The Case of Fractional-Slot Surface Permanent-Magnet Machines. Energies. 2019; 12 (9):1691.
Chicago/Turabian StyleAmbra Torreggiani; Claudio Bianchini; Matteo Davoli; Alberto Bellini. 2019. "Design for Reliability: The Case of Fractional-Slot Surface Permanent-Magnet Machines." Energies 12, no. 9: 1691.
This paper deals with the design and optimization of a synchronous reluctance machine with dual three-phase winding for fault-tolerant applications. The target is to investigate several design solutions, in terms of winding arrangements and machine geometry, to achieve a good drive system reliability both in healthy and faulty conditions. The fault reliability is evaluated in terms of torque quality, unbalanced force and magnetic coupling between the healthy and the faulty three-phase winding. In the first part of the work, two different optimization strategies of the rotor geometry are proposed and an optimal solution is selected. In the second part, the performance of the selected individual are evaluated in several healthy and faulty operating conditions to investigate the reliability of the proposed design procedure.
Cristian Babetto; Nicola Bianchi; Ambra Torreggiani; Claudio Bianchini; Matteo Davoli; Alberto Bellini. Design Optimization and Analysis of a Synchronous Reluctance Machine for Fault-Tolerant Applications. 2019 IEEE International Electric Machines & Drives Conference (IEMDC) 2019, 1784 -1791.
AMA StyleCristian Babetto, Nicola Bianchi, Ambra Torreggiani, Claudio Bianchini, Matteo Davoli, Alberto Bellini. Design Optimization and Analysis of a Synchronous Reluctance Machine for Fault-Tolerant Applications. 2019 IEEE International Electric Machines & Drives Conference (IEMDC). 2019; ():1784-1791.
Chicago/Turabian StyleCristian Babetto; Nicola Bianchi; Ambra Torreggiani; Claudio Bianchini; Matteo Davoli; Alberto Bellini. 2019. "Design Optimization and Analysis of a Synchronous Reluctance Machine for Fault-Tolerant Applications." 2019 IEEE International Electric Machines & Drives Conference (IEMDC) , no. : 1784-1791.
Energy storage is an emerging technology that can enable the transition towards renewable-energy-based distributed generation, reducing peak power demand and the time difference between production and use. The energy storage could be implemented both at grid level or at user level and nowadays different technologies are available for this purpose. In particular chemical batteries represent the de facto standard of storage systems for performance and maturity, however batteries feature a quite large environmental footprint and use precious raw materials. As an alternative to chemical batteries, mechanical storage technologies could be evaluated because of their reduced impacts on the environment and on the exploitation of raw materials. This paper presents the design, the prototyping and the experimental results of an ironless surface permanent-magnet (SPM) synchronous machine for a flywheel energy storage at household level. The electrical machine can work either as a motor or as a generator and it is the main item to fulfill the major challenges of a household application: high discharge duration and compatible size/dimension. The performance of the proposed ironless SPM machine are also compared with traditional iron core SPM synchronous machine by means of Finite Element Analysis (FEA).
Danilo David; Claudio Bianchini; Ambra Torreggiani; Alberto Bellini. Ironless Dual-Rotor Permanent-Magnet Machine for Flywheel Batteries. 2018 IEEE Energy Conversion Congress and Exposition (ECCE) 2018, 3339 -3346.
AMA StyleDanilo David, Claudio Bianchini, Ambra Torreggiani, Alberto Bellini. Ironless Dual-Rotor Permanent-Magnet Machine for Flywheel Batteries. 2018 IEEE Energy Conversion Congress and Exposition (ECCE). 2018; ():3339-3346.
Chicago/Turabian StyleDanilo David; Claudio Bianchini; Ambra Torreggiani; Alberto Bellini. 2018. "Ironless Dual-Rotor Permanent-Magnet Machine for Flywheel Batteries." 2018 IEEE Energy Conversion Congress and Exposition (ECCE) , no. : 3339-3346.
Public policies for waste regulation can foster sustainable production systems in related fields. It is a common perception that waste to energy plants (WTE) are optimal solutions in terms of energy balance for dismissed materials, since they recovery part of the energy as electricity and heat. A few researchers state that there is an optimal threshold beyond whom separated collection of waste is of no use, since it results in a reduction of total energy recovered. This paper investigates the effects of the reduction of unsorted waste in terms of climate factors and energy balance. It is shown that energy saving density from recycling is higher than energy recovery from incineration, hence, source segregated recycling is a better option for waste management. The paper proposes a benchmark to assess the net energy balance of different waste management systems. A case study is reported, based on data of Emilia-Romagna, Italy, where unsorted waste was recently reduced of about 30% thanks to a dedicated waste tax and policies to promote waste separation and re-use. The case study is used to validate the proposed benchmark, while the method is general and can be used for different waste management systems and in different countries.
Alberto Bellini; Alessandra Bonoli. Energy balance of waste management systems: A case study. 2017 IEEE International Conference on Industrial Engineering and Engineering Management (IEEM) 2017, 1495 -1499.
AMA StyleAlberto Bellini, Alessandra Bonoli. Energy balance of waste management systems: A case study. 2017 IEEE International Conference on Industrial Engineering and Engineering Management (IEEM). 2017; ():1495-1499.
Chicago/Turabian StyleAlberto Bellini; Alessandra Bonoli. 2017. "Energy balance of waste management systems: A case study." 2017 IEEE International Conference on Industrial Engineering and Engineering Management (IEEM) , no. : 1495-1499.
The interest in multiphase machines is increasing, owing to their advantages with respect to the three-phase ones, in particular for medium and high power applications. In this paper, the model of a five-phase surface-mounted permanent magnet synchronous generator, under mixed demagnetization of the rotor magnet trailing edges, and unbalance of the stator phases due to High-Resistance (H-R) connections, is developed. Then, a control scheme that can diagnose the rotor magnet demagnetization and the stator resistance dissymmetry, and ensure a nearly undisturbed behavior of the system, is presented. A current control scheme, which is based on multi-reference frame current regulators, is proposed. The on-line monitoring technique exploits the degrees of freedom of a multiphase generator. The effectiveness of the presented control scheme is verified by numerical simulations.
A. Tani; Yasser Gritli; M. Mengoni; Luca Zarri; Giacomo Sala; Alberto Bellini; G. Serra. Detection of magnet demagnetization and high-resistance connections in five-phase surface-mounted permanent magnet generators. 2015 IEEE 10th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED) 2015, 487 -493.
AMA StyleA. Tani, Yasser Gritli, M. Mengoni, Luca Zarri, Giacomo Sala, Alberto Bellini, G. Serra. Detection of magnet demagnetization and high-resistance connections in five-phase surface-mounted permanent magnet generators. 2015 IEEE 10th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED). 2015; ():487-493.
Chicago/Turabian StyleA. Tani; Yasser Gritli; M. Mengoni; Luca Zarri; Giacomo Sala; Alberto Bellini; G. Serra. 2015. "Detection of magnet demagnetization and high-resistance connections in five-phase surface-mounted permanent magnet generators." 2015 IEEE 10th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED) , no. : 487-493.
This paper investigates a new approach for the diagnosis of Rotor asymmetry in Wound-Rotor Induction Machines (WRIM). The method is assessed in a Wind Energy Conversion System, where the rotor side of the WRIM is supplied by a static converter for the control of active and reactive power flows from the generator to the electrical grid. The control system affects electric quantities and their signature. The latter cannot be used for the detection of machine asymmetries. Here, a Hybrid Fault Index (HFI) is presented, that is based on the combined use of rotor current and voltage space vectors. The validity of the developed HFI is confirmed by simulation and experiments. The proposed system can be easily embedded in the power-converter digital control system.
Y. Gritli; Claudio Rossi; D. Casadei; F. Filippetti; Alberto Bellini; Gérard-André Capolino. A new reliable fault index for rotor dissymmetry detection in wound-rotor induction machine. 2015 IEEE 10th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED) 2015, 468 -473.
AMA StyleY. Gritli, Claudio Rossi, D. Casadei, F. Filippetti, Alberto Bellini, Gérard-André Capolino. A new reliable fault index for rotor dissymmetry detection in wound-rotor induction machine. 2015 IEEE 10th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED). 2015; ():468-473.
Chicago/Turabian StyleY. Gritli; Claudio Rossi; D. Casadei; F. Filippetti; Alberto Bellini; Gérard-André Capolino. 2015. "A new reliable fault index for rotor dissymmetry detection in wound-rotor induction machine." 2015 IEEE 10th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED) , no. : 468-473.
This paper focuses on the diagnosis of induction motors in variable speed drives where the control variables are used for fault detection. After an overview of typical failure mechanisms and their causes, recent advances in the field are presented and discussed. To this aim some recent investigations, along with important and fundamental papers, are reviewed and reported in a comprehensive list of references.
Luca Zarri; Yasser Gritli; Claudio Rossi; Alberto Bellini; F. Filippetti. Fault detection based on closed-loop signals for induction machines. 2015 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD) 2015, 261 -270.
AMA StyleLuca Zarri, Yasser Gritli, Claudio Rossi, Alberto Bellini, F. Filippetti. Fault detection based on closed-loop signals for induction machines. 2015 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD). 2015; ():261-270.
Chicago/Turabian StyleLuca Zarri; Yasser Gritli; Claudio Rossi; Alberto Bellini; F. Filippetti. 2015. "Fault detection based on closed-loop signals for induction machines." 2015 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD) , no. : 261-270.
This paper focuses on modeling and experimental validation of a diagnostic fault classification procedure for interturn fault detection in permanent-magnet (PM) multiphase machines designed for fault-tolerant electric drives. The diagnostic procedure is based on the symmetrical component theory and relies upon the combined space vector vector D that gathers information from the two original space vectors obtained with different reference frames. The diagnostic index effectiveness and robustness were also investigated against other fault types such as rotor eccentricities and magnet damage to assess its discrimination capability. The proposed procedure was experimentally evaluated for the interturn fault case on a five-phase PM machine. Experiments were carried out at different speed and load levels, with increasing numbers of short-circuited turns. Both simulation and experimental results demonstrated the feasibility of the proposed diagnostic method.
Fabio Immovilli; Claudio Bianchini; Emilio Lorenzani; Alberto Bellini; Emanuele Fornasiero. Evaluation of Combined Reference Frame Transformation for Interturn Fault Detection in Permanent-Magnet Multiphase Machines. IEEE Transactions on Industrial Electronics 2014, 62, 1912 -1920.
AMA StyleFabio Immovilli, Claudio Bianchini, Emilio Lorenzani, Alberto Bellini, Emanuele Fornasiero. Evaluation of Combined Reference Frame Transformation for Interturn Fault Detection in Permanent-Magnet Multiphase Machines. IEEE Transactions on Industrial Electronics. 2014; 62 (3):1912-1920.
Chicago/Turabian StyleFabio Immovilli; Claudio Bianchini; Emilio Lorenzani; Alberto Bellini; Emanuele Fornasiero. 2014. "Evaluation of Combined Reference Frame Transformation for Interturn Fault Detection in Permanent-Magnet Multiphase Machines." IEEE Transactions on Industrial Electronics 62, no. 3: 1912-1920.
Motor current signature analysis (MCSA) based on the 50/60-Hz sidebands has become a common test in industry for monitoring the condition of the induction motor rotor cage. However, many cases of unnecessary motor inspection or outage due to false alarms produced by rotor axial duct interference have been reported. If the number of axial ducts and poles is identical, this can produce 50/60-Hz sideband frequency components in MCSA that overlap with that of rotor faults, resulting in false alarms. However, there currently is no practical test method available for distinguishing rotor faults and false indications other than testing the rotor offline or under the startup transient. In this paper, the feasibility of using the rotor fault frequency component produced by the space harmonic waves is evaluated as a solution for the first time. Since the fifth or seventh space harmonics have a spatial distribution of flux that does not penetrate in the rotor yoke to reach the axial ducts, they do not produce false alarms. The proposed method is verified on 6.6-kV motors misdiagnosed with broken bars via the 50/60-Hz sidebands of MCSA. It is shown that it provides reliable online indication of rotor faults independent of axial duct influence and can be used for screening out false alarms.
ChanSeung Yang; Tae-June Kang; Sang Bin Lee; Ji-Yoon Yoo; Alberto Bellini; Luca Zarri; Fiorenzo Filippetti. Screening of False Induction Motor Fault Alarms Produced by Axial Air Ducts Based on the Space-Harmonic-Induced Current Components. IEEE Transactions on Industrial Electronics 2014, 62, 1803 -1813.
AMA StyleChanSeung Yang, Tae-June Kang, Sang Bin Lee, Ji-Yoon Yoo, Alberto Bellini, Luca Zarri, Fiorenzo Filippetti. Screening of False Induction Motor Fault Alarms Produced by Axial Air Ducts Based on the Space-Harmonic-Induced Current Components. IEEE Transactions on Industrial Electronics. 2014; 62 (3):1803-1813.
Chicago/Turabian StyleChanSeung Yang; Tae-June Kang; Sang Bin Lee; Ji-Yoon Yoo; Alberto Bellini; Luca Zarri; Fiorenzo Filippetti. 2014. "Screening of False Induction Motor Fault Alarms Produced by Axial Air Ducts Based on the Space-Harmonic-Induced Current Components." IEEE Transactions on Industrial Electronics 62, no. 3: 1803-1813.
This paper presents the design of an axial flux permanent magnet machine for in-wheel application. The machine design and optimization are developed using two-dimensional (2-D) multi-layer finite element analysis approach. The three-dimensional model of the machine has been approximated with a set of simulations in which the two-dimensional geometrical parameters were varied appropriately in order to reproduce the actual three-dimensional magnetic behavior. During design optimization, special attention was paid to the reduction of flux linkage harmonic content and to the reduction of cogging torque through the change of the permanent magnet profile and dimensions. Finally, a prototype machine was built to validate the effectiveness of the proposed method.
Claudio Bianchini; Fabio Immovilli; Emilio Lorenzani; Alberto Bellini; Lorenzo Felici. Axial flux permanent magnet machine desing and optimization using multi-layer 2-D simulation. IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society 2013, 2620 -2625.
AMA StyleClaudio Bianchini, Fabio Immovilli, Emilio Lorenzani, Alberto Bellini, Lorenzo Felici. Axial flux permanent magnet machine desing and optimization using multi-layer 2-D simulation. IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society. 2013; ():2620-2625.
Chicago/Turabian StyleClaudio Bianchini; Fabio Immovilli; Emilio Lorenzani; Alberto Bellini; Lorenzo Felici. 2013. "Axial flux permanent magnet machine desing and optimization using multi-layer 2-D simulation." IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society , no. : 2620-2625.
This paper analyzes the performance of a grid-tied photovoltaic module integrated, transformerless, three-phase Current Source Inverter (CSI). The design exploits CSI inherent step-up capability to obtain a single stage power interfacing between the low voltage PV input and the high AC voltage output, to be fed into the distribution grid. A modified CSI converter topology is proposed along with a suitable PWM strategy and a simple closed loop control. The theoretical analysis and simple analytic expressions highlighted the performance and limitations of the topology when employed in single-stage PV microinverter supplied by a single low voltage PV panel. The principle of operation and control is described, and the traditional CSI topology has been simulated numerically in Matlab/Simulink environment. Results obtained with the proposed topology are presented and evaluated in order to validate the theoretical assumptions.
Emilio Lorenzani; Fabio Immovilli; Claudio Bianchini; A. Bellini. Performance analysis of a modified Current Source Inverter for photovoltaic microinverter applications. IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society 2013, 1809 -1814.
AMA StyleEmilio Lorenzani, Fabio Immovilli, Claudio Bianchini, A. Bellini. Performance analysis of a modified Current Source Inverter for photovoltaic microinverter applications. IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society. 2013; ():1809-1814.
Chicago/Turabian StyleEmilio Lorenzani; Fabio Immovilli; Claudio Bianchini; A. Bellini. 2013. "Performance analysis of a modified Current Source Inverter for photovoltaic microinverter applications." IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society , no. : 1809-1814.
This paper is aimed at the modeling and simulation of wind power system, with particular emphasis on small wind turbines employing surface permanent magnet synchronous generators (SPMSGs). Generator and inverter front-end interaction is analytically and numerically modeled, in order to evaluate the generator's efficiency depending on its electric parameters, both during normal and power limited operation. Passive and active rectifier front-end are taken into account to assess the influence of power electronics front-end over system performances. The final target of this work is to determine design guidelines for small wind turbine system optimization. The analysis is carried out through simulations which take into account the interactions of the SPMSG's electrical parameters and through the evaluation of the generator's efficiency at different operating conditions and inverter front-end architectures. The data obtained was further validated with experimental characterization of two different system architectures.
Claudio Bianchini; Fabio Immovilli; Emilio Lorenzani; Alberto Bellini; Giampaolo Buticchi. Micro wind turbine system integration guidelines PMSG and inverter front end choices. IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society 2012, 1073 -1078.
AMA StyleClaudio Bianchini, Fabio Immovilli, Emilio Lorenzani, Alberto Bellini, Giampaolo Buticchi. Micro wind turbine system integration guidelines PMSG and inverter front end choices. IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society. 2012; ():1073-1078.
Chicago/Turabian StyleClaudio Bianchini; Fabio Immovilli; Emilio Lorenzani; Alberto Bellini; Giampaolo Buticchi. 2012. "Micro wind turbine system integration guidelines PMSG and inverter front end choices." IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society , no. : 1073-1078.
Double cage induction motors are typically employed in applications that require high starting torque for frequent, loaded starts. This makes the starting (outer) cage susceptible to fatigue failure since it must withstand the large thermo-mechanical stress associated with the high starting current and long acceleration time. Conventional FFT-based spectrum analysis techniques are insensitive to outer cage faults due to the small outer cage current under steady state operation, and the fault indicators and thresholds applied to single cage rotors cannot be used. Therefore, there is a strong industrial need for research and development of analysis techniques and advanced fault detection algorithms for double cage machines. However, there are only a few publications that investigate double cage rotor faults. In this paper, a dynamic model for rotor cage faults in double cage motors, which is the first step towards double cage rotor fault research, is derived. A 7.5 Hp separate end ring fabricated copper double cage rotor is built for experimental verification of the proposed fault model (copper inner cage/brass outer cage). The tests performed under startup and steady state operation show that the proposed fault model can provide sufficient accuracy and can be used as the basis for interpretation of FFT results and development of advanced fault detection algorithms.
Emilio Lorenzani; A. Salati; C. Bianchini; Fabio Immovilli; Alberto Bellini; S.B. Lee; J. Yoo; C. Kwon. Dynamic modeling of double cage induction machines for diagnosis of rotor faults. 2012 IEEE Energy Conversion Congress and Exposition (ECCE) 2012, 1299 -1305.
AMA StyleEmilio Lorenzani, A. Salati, C. Bianchini, Fabio Immovilli, Alberto Bellini, S.B. Lee, J. Yoo, C. Kwon. Dynamic modeling of double cage induction machines for diagnosis of rotor faults. 2012 IEEE Energy Conversion Congress and Exposition (ECCE). 2012; ():1299-1305.
Chicago/Turabian StyleEmilio Lorenzani; A. Salati; C. Bianchini; Fabio Immovilli; Alberto Bellini; S.B. Lee; J. Yoo; C. Kwon. 2012. "Dynamic modeling of double cage induction machines for diagnosis of rotor faults." 2012 IEEE Energy Conversion Congress and Exposition (ECCE) , no. : 1299-1305.
This paper investigates the relationship between vibration and current in induction motors operated under external vibrations. Two approaches are usually available to define this relationship. The former is based on airgap variations, while the latter is based on torque perturbation. This paper is focused on the airgap variation model. The ball bearing fault is modeled by contact mechanics. External vibrations often occur in many industrial applications where externally induced vibrations of suitable amplitude cause cyclic radial loading on the machine shaft. The model is validated by experiments, owing to a dedicated test setup, where an external vibration source (shaker) was employed, together with ball bearing alterations in order to decrease the stiffness of the support along the radial direction. To maximize the effects of externally induced vibrations, the frequency chosen was near the flexural resonance of the rotor (determined by finite-element method analysis). The direction of the external vibration is radial with respect to the axis of the electric machine under test. During tests, both stator phase currents and vibration of the machine were sampled. The test setup allowed one to vary the machine speed and load, vibration amplitude, and bearing stiffness (damage level). Radial effects are usually visible only in the case of large failures that result in significant airgap variations, as confirmed by experiments.
Fabio Immovilli; Claudio Bianchini; Marco Cocconcelli; Alberto Bellini; Riccardo Rubini. Bearing Fault Model for Induction Motor With Externally Induced Vibration. IEEE Transactions on Industrial Electronics 2012, 60, 3408 -3418.
AMA StyleFabio Immovilli, Claudio Bianchini, Marco Cocconcelli, Alberto Bellini, Riccardo Rubini. Bearing Fault Model for Induction Motor With Externally Induced Vibration. IEEE Transactions on Industrial Electronics. 2012; 60 (8):3408-3418.
Chicago/Turabian StyleFabio Immovilli; Claudio Bianchini; Marco Cocconcelli; Alberto Bellini; Riccardo Rubini. 2012. "Bearing Fault Model for Induction Motor With Externally Induced Vibration." IEEE Transactions on Industrial Electronics 60, no. 8: 3408-3418.
Internal permanent-magnet synchronous machines are spreading in industrial production. They feature high torque density and extended speed range that are key issues in many fields of applications, however their cogging torque is typically quite high. Many methods and design guidelines for cogging torque reduction exist in literature and this paper compares them. For this purpose, the different design guidelines are applied to a common reference machine in order to assess their effectiveness. Computer finite element analysis (FEA) are carried out for each case in order to compare the cogging torque reduction capability of the different techniques. The side effects of these techniques, such as back-EMF and rated torque profile distortions, will be taken into account. The paper contribution is to compare the various cogging torque reduction techniques and magnetic geometries on a common reference machine to identify the most effective ones.
Claudio Bianchini; Fabio Immovilli; Emilio Lorenzani; Alberto Bellini; Matteo Davoli. Review of Design Solutions for Internal Permanent-Magnet Machines Cogging Torque Reduction. IEEE Transactions on Magnetics 2012, 48, 2685 -2693.
AMA StyleClaudio Bianchini, Fabio Immovilli, Emilio Lorenzani, Alberto Bellini, Matteo Davoli. Review of Design Solutions for Internal Permanent-Magnet Machines Cogging Torque Reduction. IEEE Transactions on Magnetics. 2012; 48 (10):2685-2693.
Chicago/Turabian StyleClaudio Bianchini; Fabio Immovilli; Emilio Lorenzani; Alberto Bellini; Matteo Davoli. 2012. "Review of Design Solutions for Internal Permanent-Magnet Machines Cogging Torque Reduction." IEEE Transactions on Magnetics 48, no. 10: 2685-2693.