Search results for: Nicola Bianchi

Items from 1 to 20 out of 174 results

article

Synchronous reluctance motor analytical model cross-saturation and magnetization analysis

Ladislav Knebl, Nicola Bianchi, Giacomo Bacco, Cestmir Ondrusek

Przegląd Elektrotechniczny > 2020 > R. 96, nr 1 > 108--112

The synchronous reluctance motor design process is usually considering objectives that are in direct or indirect relationship with the rotor magnetic saliency ξ. The magnetic saliency is deﬁned as the ratio of direct (d) Ld and quadrature (q) inductances Lq. Both inductances and their dependence on the dq-axis current plane are investigated with a non-linear analytical model in this paper. With the...

article

LARS versus hamstring tendon autograft in anterior cruciate ligament reconstruction: a single-centre, single surgeon retrospective study with 8 years of follow-up

Nicola Bianchi, Federico Sacchetti, Vanna Bottai, Marco Gesi, more

European Journal of Orthopaedic Surgery & Traumatology > 2019 > 29 > 2 > 447-453

Purpose The choice of graft type in the anterior cruciate ligament (ACL) reconstruction remains a subject of controversy. The aim of this study was to assess the outcomes in ACL reconstructions performed using a four-strand hamstring tendon graft (4SHG) or a LARS ligament comparing the effectiveness of the two grafts at a medium follow-up of 8 years. Methods This retrospective, single-centre, single...

article

Analytical Modeling of No-Load Eccentric Slotted Surface-Mounted PM Machines: Cogging Torque and Radial Force

Samad Taghipour Boroujeni, Pezhman Jalali, Nicola Bianchi

IEEE Transactions on Magnetics > 2017 > 53 > 12 > 1 - 8

In this paper, the air-gap flux density components in the eccentric surface-mounted phase modulation (SPM) machines are predicted analytically. In the provided model, the slotting effects of the armature are taken into account. In the modeling process, conformal transformations (CTs) are employed to obtain an equivalent concentric slotless machine for the eccentric slotted PM machine. To satisfy the...

article

Line-Start PM-Assisted Synchronous Motor Design, Optimization, and Tests

Damiano Mingardi, Nicola Bianchi

IEEE Transactions on Industrial Electronics > 2017 > 64 > 12 > 9739 - 9747

Line-start synchronous motors (LSSMs) have been recently introduced in the motor market to meet the new efficiency class requirements. They exhibit high efficiency and power factor compared with induction motors (IMs), but the complex design, manufacture, and high cost due to presence of permanent magnets (PM) limit their widespread use. This paper proposes a new approach for the design of LSSMs,...

article

Nonlinear Analytical Computation of the Magnetic Field in Reluctance Synchronous Machines

Hanafy Mahmoud, Nicola Bianchi, Giacomo Bacco, Nicola Chiodetto

IEEE Transactions on Industry Applications > 2017 > 53 > 6 > 5373 - 5382

This paper deals with an analytical model of reluctance synchronous motor, able to consider both stator slotting effect and magnetic saturation in the stator and rotor iron paths. It joints the field distribution at the air gap to a lumped-parameter magnetic network. Local saturation factors are defined so as to adjust the flux-density distribution. The analytical approach exhibits great potentiality,...

article

Iron Saturation Impact on High-Frequency Sensorless Control of Synchronous Permanent-Magnet Motor

Massimo Barcaro, Mattia Morandin, Tomas Pradella, Nicola Bianchi, more

IEEE Transactions on Industry Applications > 2017 > 53 > 6 > 5470 - 5478

An increasing interest for permanent-magnet (PM) synchronous machines equipped with fractional-slot concentrated winding is observed. Among others, the surface-mounted PM (SPM) machines are widely used by motor manufacturers. The spoke-type interior PM (IPM) machines are also particularly attractive. Nowadays, PM machines are often selected for variable-speed applications without precise positioning...

chapter

Electrical machine analysis using free software

David Meeker, Nicola Bianchi, Johan Gyselinck, Ruth V. Sabariego, more

2017 IEEE Energy Conversion Congress and Exposition (ECCE) > 1 - 289

2017 IEEE Energy Conversion Congress and Exposition (ECCE)

This presentation reviewed the basics of multi-objective optimization algorithms and showed their use in SyR-e to design surface PM machines. Next steps for PM machines in SyR-e: • Preliminary design (some features for fractional slot windings needs to be improved) • Sleeve sizing equations • Include other type of PM rotors • … suggestions?

chapter

High speed motors: A comparison between synchronous PM and reluctance machines

Cristian Babetto, Giacomo Bacco, Grazia Berardi, Nicola Bianchi

2017 IEEE Energy Conversion Congress and Exposition (ECCE) > 3927 - 3934

2017 IEEE Energy Conversion Congress and Exposition (ECCE)

In high speed systems, the recent trend is to couple the electric machine directly to the mechanical shaft, in order to avoid the use of a gear-box and to increase the overall efficiency and reliability. Surface Permanent Magnet mounted (SPM) machines are usually adopted in such systems for their high torque density thanks to rare-earth PMs. The cost of rare-earth PMs together with the risk of their...

chapter

Rotor losses reduction in high speed PM generators for organic rankine cycle systems

Grazia Berardi, Nicola Bianchi

2017 IEEE Energy Conversion Congress and Exposition (ECCE) > 5396 - 5402

2017 IEEE Energy Conversion Congress and Exposition (ECCE)

In an Organic Rankine Cycle (ORC) systems, the Permanent Magnet (PM) generator is directly coupled to high-speed turbine shaft, in order to increase system efficiency avoiding introduction of gear-box. On the other hand, current time harmonics induce high frequency currents in rotor parts, which cause a temperature increase. PMs are strongly affected by the operating temperature, since both remanence...

chapter

High torque density PM motor for racing applications

Marco Munaro, Nicola Bianchi, Giovanni Meneghetti

2017 IEEE Energy Conversion Congress and Exposition (ECCE) > 5826 - 5833

2017 IEEE Energy Conversion Congress and Exposition (ECCE)

Referring to a 4-wheel drive Formula Student Electric vehicle, a fractional-slot synchronous permanent magnet machine has been designed. Torque density has been improved adopting outer rotor topology and lightweight materials. An ironless rotor with PMs placed in an Halbach array configuration allows reduced rotor inertia to be obtained. The results described in the paper provide a quantitative assessment...

chapter

Choice of flux-barriers position in synchronous reluctance machines

Giacomo Bacco, Nicola Bianchi

2017 IEEE Energy Conversion Congress and Exposition (ECCE) > 1872 - 1879

2017 IEEE Energy Conversion Congress and Exposition (ECCE)

This paper deals with the design of the rotor of synchronous reluctance machines, characterized by a multi flux-barrier structure. In particular, the focus will be on the proper design of flux-barriers geometry. An analytical model is adopted to compute the impact of the rotor flux-barriers on the torque, focusing on the torque ripple. Thanks to proper assumptions, the analytical model is simplified...

article

Geometry of Line Start Synchronous Motors Suitable for Various Pole Combinations

Damiano Mingardi, Nicola Bianchi, Michele Dai Pre

IEEE Transactions on Industry Applications > 2017 > 53 > 5 > 4360 - 4367

Line start synchronous motors (LSSM) have been recently introduced in the motor market to meet new efficiency class requirements. They exhibit high efficiency and power factor compared with induction motors. On the other hand, the difficult design, manufacture, and high cost due to the presence of permanent magnets limit their widespread use in the market. Another key factor that limits the LSSM diffusion...

article

Geometry Analysis and Optimization of PM-Assisted Reluctance Motors

Yawei Wang, Giacomo Bacco, Nicola Bianchi

IEEE Transactions on Industry Applications > 2017 > 53 > 5 > 4338 - 4347

This paper deals with a detailed geometry analysis of the rotor structure for both synchronous reluctance and permanent magnet (PM)-assisted reluctance motor in order to suggest an automatic procedure to design the rotor structure. The shape of flux barriers is selected to achieve both high

$d$

-axis inductance and low

$q$

-axis inductance to obtain high output torque and high power factor. Methods...

article

Improved Analytical Estimation of Rotor Losses in High-Speed Surface-Mounted PM Synchronous Machines

Nicola Chiodetto, Nicola Bianchi, Luigi Alberti

IEEE Transactions on Industry Applications > 2017 > 53 > 4 > 3548 - 3556

The prediction of rotor losses, primarily due to eddy currents (ECs) in either magnets or other rotor conductive parts, is of great concern for the design of surface-mounted permanent magnet synchronous machines. Particularly, in high-speed electrical machines, EC losses could be severe and seriously affect the machine performance in terms of thermal management and demagnetization, in turn influencing...

chapter

Synchronous motors for traction applications

Yawei Wang, Nicola Bianchi, Silverio Bolognani, Luigi Alberti

2017 International Conference of Electrical and Electronic Technologies for Automotive > 1 - 8

2017 International Conference of Electrical and Electronic Technologies for Automotive

Nowadays, the electrical traction system is gaining more and more attentions since it is regarded as the most promising solution to ease energy crisis, air pollution and global warming. As one of the key devices, the electrical motors determine the main performance of the transport system. In this paper, a synthesis of synchronous motors for traction applications is presented. Since PM motors have...

article

Analytical Modeling of Slotless Eccentric Surface-Mounted PM Machines Using a Conformal Transformation

Pezhman Jalali, Samad Taghipour Boroujeni, Nicola Bianchi

IEEE Transactions on Energy Conversion > 2017 > 32 > 2 > 658 - 666

In this work, an analytical technique is developed for modeling of the air gap flux density in the slotless eccentric surface-mounted permanent magnet (PM) machines. In the developed model, a 2-D solution for the Poisson equation is provided. In the modeling process, the eccentric stator is replaced with an equivalent current sheet at the stator bore. This current sheet is selected such that the overall...

chapter

A high speed PM generator for an Organic Rankine Cycle system

Grazia Berardi, Nicola Bianchi, Daniel Gasperini

2017 IEEE International Electric Machines and Drives Conference (IEMDC) > 1 - 8

2017 IEEE International Electric Machines and Drives Conference (IEMDC)

This paper deals with the design guidelines of a high-speed Permanent Magnet (PM) generator used in an Organic Rankine Cycle (ORC) system. In such an application, in addition to electromagnetic analysis, particular care has to be given to specific issues such as: the design of the cover sheet, which influences both magnetic and mechanical performance; computation of friction losses in the air gap,...

chapter

Analytical approach to determine the power limit of high-speed synchronous reluctance machines

Cristian Babetto, Giacomo Bacco, Nicola Bianchi

2017 IEEE International Electric Machines and Drives Conference (IEMDC) > 1 - 7

2017 IEEE International Electric Machines and Drives Conference (IEMDC)

The design of synchronous reluctance machines for high-speed applications is an issue that nowadays remains almost not dealt with. The thickness of the iron ribs that mechanically sustain the structure increases with the rotor speed, so that a high magnetic flux flows through them. Therefore, the available torque decreases with the rated speed required by the application. The aim of this paper is...

chapter

Investigation of self-excitation in reluctance generators

Yawei Wang, Nicola Bianchi

2017 IEEE International Electric Machines and Drives Conference (IEMDC) > 1 - 8

2017 IEEE International Electric Machines and Drives Conference (IEMDC)

In this paper, an analytical model in the dq reference frame is developed to recognize the steady-state of the self-excited reluctance generator, considering no-load and resistive load conditions. A fast method to estimate the minimum capacitance requirements is proposed. Experiments are carried out to verify the analytical results. After that, attention is paid on the capability of self-excitation...

chapter

Unified equivalent MMF concept for torque analysis of AC machines

Qian Wu, Kaiyuan Lu, Peter Omand Rasmussen, Nicola Bianchi, more

2017 IEEE International Electric Machines and Drives Conference (IEMDC) > 1 - 8

2017 IEEE International Electric Machines and Drives Conference (IEMDC)

For many industrial applications, upgrading the machine performance by changing the rotor structure while keeping or slightly modifying the stator structure is an economic and effective solution for complying with the existing production line. Electromagnetic torque is always one of the key factors that need to be evaluated. An intuitive and universal approach applying the same principle for torque...

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INFONA - science communication portal

Search results for: Nicola Bianchi

Synchronous reluctance motor analytical model cross-saturation and magnetization analysis

LARS versus hamstring tendon autograft in anterior cruciate ligament reconstruction: a single-centre, single surgeon retrospective study with 8 years of follow-up

Analytical Modeling of No-Load Eccentric Slotted Surface-Mounted PM Machines: Cogging Torque and Radial Force

Line-Start PM-Assisted Synchronous Motor Design, Optimization, and Tests

Nonlinear Analytical Computation of the Magnetic Field in Reluctance Synchronous Machines

Iron Saturation Impact on High-Frequency Sensorless Control of Synchronous Permanent-Magnet Motor

Electrical machine analysis using free software

High speed motors: A comparison between synchronous PM and reluctance machines

Rotor losses reduction in high speed PM generators for organic rankine cycle systems

High torque density PM motor for racing applications

Choice of flux-barriers position in synchronous reluctance machines

Geometry of Line Start Synchronous Motors Suitable for Various Pole Combinations

Geometry Analysis and Optimization of PM-Assisted Reluctance Motors

Improved Analytical Estimation of Rotor Losses in High-Speed Surface-Mounted PM Synchronous Machines

Synchronous motors for traction applications

Analytical Modeling of Slotless Eccentric Surface-Mounted PM Machines Using a Conformal Transformation

A high speed PM generator for an Organic Rankine Cycle system

Analytical approach to determine the power limit of high-speed synchronous reluctance machines

Investigation of self-excitation in reluctance generators

Unified equivalent MMF concept for torque analysis of AC machines

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