Athanasios G. Sarigiannidis

National Technical University of Athens

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Antonios G. Kladas

National Technical University of Athens

Minos E. Beniakar

Motor Design (United Kingdom)

Panagiotis Kakosimos

ABB (Sweden)

C. Patsios

Newcastle University

John Prousalidis

National Technical University of Athens

Fotios D. Kanellos

Technical University of Crete

Ioannis K. Pallis

University of Patras

Efstratios Chatzinikolaou

University of Oxford

Chris Gerada

University of Nottingham

Emmanuel C. Tatakis

University of Patras

Cooperative Institutions

National Technical University of Athens

National and Kapodistrian University of Athens

Hellenic Naval Academy

Institute of Electrical and Electronics Engineers

Gorgias Press (United States)

University of West Attica

University of Patras

University of Pisa

University of Nottingham

University of Nottingham Ningbo China

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High efficiency Shaft Generator drive system design for Ro-Ro trailer-passenger ship application

Athanasios G. Sarigiannidis Antonios G. Kladas Efstratios Chatzinikolaou C. Patsios

This paper introduces a particular direct driven Shaft Generator (SG) system for implementation in an existing Ro-Ro (Roll on board-Roll off board) trailer-passenger ship. In a first step, both a high speed (1200rpm) Salient-Pole Synchronous Generator (SPSG) and a low speed (400rpm) direct driven Permanent Magnet Synchronous Generator (PMSG) of the same nominal power with the SG installed in the investigated ship are designed and geometrically optimized, based on the specified operating characteristics. The generators are quantitatively compared and assessed in terms of their torque capability, efficiency and produced power quality, illustrating that the low-speed PMSG constitutes a favorable option for SG applications. In a second step, assessing the benefits of the low speed PMSG, a drive system is designed for the implementation of PMSG in the ship's electric grid. Appropriate converter topology and advanced generator control methodology are adopted enabling successful interconnection of the SG system with the electric grid as well as high quality electric power supply. Finally, the economic benefits of the operation of the proposed SG systems in terms of lower fuel consumption are investigated.

Trailer

Electric generator

10.1109/esars.2015.7101529

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Citations (16)

Comparison of in-wheel permanent magnet motors for electric traction

2022 International Conference on Electrical Machines (ICEM) (2014)

Minos E. Beniakar Panagiotis Kakosimos Christos T. Krasopoulos Athanasios G. Sarigiannidis Antonios G. Kladas

This paper undertakes a comparative study between two different in-wheel Surface Mounted Permanent Magnet motors with Fractional Slot Concentrated Winding configurations designed for a light electric vehicle application. For the design of both motors two different approaches are followed, regarding the winding configuration and the relative dimensions of the motor, i.e. axial length and air-gap diameter, and additionally two alternative strategies are adopted concerning the selection of the reference operational point. The first motor comprises a double layer concentrated winding with all teeth wound while is slightly over-dimensioned increasing efficiency during overload operation. A single layer concentrated winding with alternate teeth wound and unequal teeth distribution is adopted for the second motor dimensioned in terms of weight minimization considering the nominal load operation. For the optimization of the first alternative, Taguchi's method is utilized, while for the latter one a Strength Pareto Evolutionary Algorithm variant is developed. Both performances are validated by examining manufactured prototypes under real conditions.

Traction motor

Minification

Air gap (plumbing)

10.1109/icelmach.2014.6960534

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Citations (4)

Design of surface PM motors for pod application utilizing a 3D hydrodynamic model

Athanasios G. Sarigiannidis Antonios G. Kladas A. Mountaneas Minos E. Beniakar Gerasimos Politis

A pod is a propeller propulsion device installed externally to the ship's hull. The pod system comprises a short propulsion shaft, on which the propulsion electric motor is mounted. In most cases, propulsion is achieved by means of fixed pitch propellers powered by an AC synchronous motor (conventional, permanent magnet) or asynchronous electric motor, fitted inside the pod. Amongst the highest failure indices are those of main electric motor parts, such as the stator windings and core, the rotor windings and the slip ring electric connectors. These high failure rates are attributed mainly to the high temperature development in windings, leading to excessive overheating stresses, indicating that the motors have not been properly selected according to the stressful conditions they are subject to operate in. This paper deals with the design procedure of a surface mounted permanent magnet synchronous motor for application as a podded main propulsion motor. Specifically, it is an Azipod system that is an outboard marine propulsion unit, in which the engine is out of the hull, is rotatable around itself and the shaft is directly connected to the propeller.

Marine propulsion

Slip ring

Synchronous motor

Propulsor

10.1109/icelmach.2016.7732941

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Citations (4)

Multi-operating points PM motor design methodology for electric actuation systems

2022 International Conference on Electrical Machines (ICEM) (2014)

Athanasios G. Sarigiannidis Minos E. Beniakar Panagiotis Kakosimos Antonios G. Kladas

In this paper, a comparative optimal design of Permanent Magnet Motors (PMMs) for aerospace actuation applications based on single and double layer Fractional Slot Concentrated Winding (FSCW) topologies with different motor segmentation strategies is undertaken, by means of a combined electromagnetic, fault tolerance and thermal evaluation. Initially, analytical machine equations and 2D Finite Element (FE) analysis are employed for the determination of the motors basic dimensional and operating characteristics. Both configurations considered are in a next step optimized regarding the mean torque, efficiency, torque ripple, induced Electromotive Force (EMF) quality and motor weight. The proposed methodology involves appropriate handling of mean torque and induced EMF as constraints through the application of a particular single-objective Particle Swarm Optimization (PSO) technique accounting also for multiple motor operating conditions. Fault tolerance and thermal robustness of the optimized motors are also examined. Both single layer and double layer FSCW PMM optimal configurations present complementary advantages for this class of applications.

Torque ripple

Robustness

10.1109/icelmach.2014.6960539

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Citations (4)

Model Predictive Control Employing Finite-Element Methods for Aerospace Actuators

Materials science forum (2016)

Panagiotis Kakosimos Minos E. Beniakar Athanasios G. Sarigiannidis Antonios G. Kladas

In this paper the strategy of the extraction of an advanced simulation model of interior permanent magnet synchronous machine is suggested in order to be employed by Model Predictive Control schemes. The conventional dq-axis mathematical model is modified in order to include data derived from finite element analysis (FEA). Indirect interaction between FEA and circuit simulation enhances model fidelity embodying the influence of saturation and cross-coupling effects. The proposed method of developing a detailed simulation model opens new prospects on the control of electrical machines.

Model Predictive Control

Model order reduction

10.4028/www.scientific.net/msf.856.202

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Citations (1)

Model Predictive Torque Control with low Torque Ripple for Interior PM Motor Variable Speed Drives

Athanasios G. Sarigiannidis Foteini A. Karamountzou Antonios G. Kladas

This paper proposes a discrete Model Predictive Torque Control (MPTC) methodology, utilizing low torque ripple for Interior Permanent Magnet Motor (IPMM). The proposed controller utilizes a non-linear accurate discrete IPMM model, as well as a convenient cost function, in order to achieve optimal tracking control over wide speed range. More specifically, Maximum Torque per Ampere (MTPA) and Field Weakening (FW) operating principles are imposed via particular terms in the cost function. Typically, the switching principle of MPC in voltage-source inverter causes significant torque ripple. The designed MPTC forces the produced electromagnetic torque to remain within certain tolerance bands, through a specific constraint. The developed IPMM control technique is evaluated and compared with relevant MPTC approach without torque ripple limitation, under both steady state and dynamic operating conditions. The obtained results verify the superiority of MPTC in terms of robustness and dynamic behavior, as well as its effectiveness in reducing the IPMM torque ripple.

Torque ripple

Stall torque

Damping torque

Model Predictive Control

Robustness

10.1109/icelmach.2018.8506909

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Citations (2)

Geometry Optimization of Synchronous Machines Used on Ship Shaft Generator Systems

Materials science forum (2014)

Athanasios G. Sarigiannidis C. Patsios A. Pittaras Antonios G. Kladas

In this paper, the geometry optimization and analysis of two synchronous machines for ship shaft generator applications was carried out. The use of shaft generators in marine applications is a convenient and effective way to supply electric energy to the ship, operating in conjunction with conventional diesel generators. On a first step, state of the art topologies of shaft generator systems are identified and evaluated. In addition, potential improvements in shaft generator systems are proposed. On a second step, a low-speed, direct-driven Permanent Magnet Synchronous Generator (PMSG) for shaft generator applications is designed and optimized in terms of torque production as well as efficiency. The PMSG is compared with an equal power Salient-Pole generator driven by a step-up gear, which is a set-up commonly used in shaft generator systems. The machines are evaluated and optimized in terms of torque production, efficiency and electromotive forces (EMF) harmonic content in nominal operating conditions.

Shunt generator

Diesel generator

Drive shaft

10.4028/www.scientific.net/msf.792.245

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Citations (4)

Induction motor design considerations for LNG carrier dual fuel electric propulsion

E. Mitsi Athanasios G. Sarigiannidis Antonios G. Kladas

This paper proposes a design procedure of induction motor for Liquefied Natural Gas (LNG) carrier applications, implementing dual fuel electric propulsion system. For the purposes of the analysis, a preliminary motor design stage is performed by using classical analytical formulae and a parameterization of the design is introduced. In a next step, a critical design stage is developed, based on a geometry optimization procedure at nominal operating conditions by using 2D Finite Element (FE) modeling. The optimization criteria are focused on the minimization of motor total losses at nominal load, in order to achieve high efficiency of the propulsion drive system, and the minimization of torque ripple, in order to provide increased reliability. Finally, for the final optimized motor design, the performance and efficiency indexes are evaluated as well as the equivalent circuit parameters for implementation in the drive control model are determined.

Liquefied natural gas

Minification

Torque ripple

10.1109/wemdcd.2017.7947730

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Citations (0)

Performance evaluation and thermal analysis of interior permanent magnet traction motor over a wide load range

Athanasios G. Sarigiannidis Minos E. Beniakar Panagiotis Kakosimos Antonios G. Kladas

This paper investigates the electromagnetic and thermal behavior of a Double Layer Interior Permanent Magnet Motor (DLIPMM) over a wide load and speed range for an Electric Vehicle (EV) application. The DLIPMM is simulated via a transient 2D Finite Element (FE) model, allowing for the accurate mapping of the motor's main performance indexes. Simulations are performed for armature currents ranging from zero up to two times the nominal for all possible current phase angles and the torque and efficiency versus speed curves for a wide load range are extracted. The Maximum Torque per Ampere (MTPA) control for the Constant Torque Region (CTR) is employed, provided that the voltage constraints are not violated. For the Constant Power Region (CPR) a specific Field Weakening (FW) strategy is utilized in order to achieve an efficient motor drive. In a next step, a transient thermal FE model for the DLIPMM over a reference EV drive cycle and under abrupt overload condition is employed, in order to investigate the motor thermal robustness. The results demonstrate the benefits of the designed DLIPMM configuration, in terms of performance, efficiency, overload capability and thermal robustness.

Robustness

Traction motor

10.1109/icelmach.2016.7732897

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Citations (10)

Switching Frequency Impact on Permanent Magnet Motors Drive System for Electric Actuation Applications

IEEE Transactions on Magnetics (2015)

Athanasios G. Sarigiannidis Antonios G. Kladas

This paper investigates the harmonic losses and torque ripple of a surface permanent magnet (SPM) motor driven by pulsewidth-modulated inverter for a wide range of switching frequencies (SFs), using a 2-D nonlinear time stepping finite-element model, including strand conductors proximity effect, coupled with an appropriate external electric circuit. Such a method enables the estimation of torque ripple as well as the accurate prediction of the eddy current losses in the windings, lamination core, and PMs, respectively. Moreover, the total power losses of the inverter are calculated via analytical techniques. The analysis undertaken proposes an optimum SF, in terms of overall drive system efficiency and torque quality, considering multiple operating conditions. The simulated results are validated by measurements on a prototype SPM actuator, illustrating that the SF plays an important role on SPM motor drive applications.

Electropermanent magnet

10.1109/tmag.2014.2358378

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Citations (35)