Thermal Analysis of Salient Pole Synchronous Machines by Multiple Model Planes Approach

Ghahfarokhi, Payam Shams; Kallaste, Ants; Podgornov, A.; Belahcen, Anouar; Vaimann, Toomas; Kudrjavtsev, Oleg

doi:10.1109/icem49940.2020.9270753

Cited by 9 publications

(5 citation statements)

References 26 publications

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“…Some guidelines to create an equivalent thermal circuit for electric machines are provided by [3]. More complex and accurate thermal models based on lumped parameters are presented in [23,24].…”

Section: Discussion About Improvements In the Designmentioning

confidence: 99%

“…The design procedure allows either single-layer or double-layer armature winding. Although the design equations regard the bottom of the slot as straight-shaped (trapezoidal slots), a rounded bottom (dashed lines in Figure 2) could be easily implemented by changing (24) to calculate the correct slot surface that would be slightly reduced. It has been chosen to use 36 slots and double-layer lap windings, which results in 36 coils, meaning 2 coils per pole per phase.…”

Section: Generator Topologymentioning

confidence: 99%

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A Step-by-Step Procedure to Perform Preliminary Designs of Salient-Pole Synchronous Generators

2021

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This paper presents a straightforward step-by-step procedure to design salient-pole synchronous generators, starting with its main specifications and finishing with all necessary data to put it on production. As most of the electricity is generated by synchronous generators, the design of these machines remains an interesting subject, but, although it is important, it is difficult to find a complete step-by-step procedure in the literature. The proposed procedure can be followed by an electrical engineer or student and, distinctively from most papers and books, all steps are presented. Such a procedure is based on analytic calculations, eventually relying on finite element simulation to verify if everything is all right and to adjust some design parameters. All calculations have been chosen to keep the design as simple as possible; otherwise, it would not be possible to present all steps and procedures. Therefore, it can be used for beginners in the art of design-synchronous generators, applied to obtain an initial design, or be adopted by any electrical engineering course, not only aiming to be an introductory electrical machine design course but mainly to enhance the students’ comprehension of synchronous machines. The results have been compared with finite element simulation, presenting very small differences.

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Section: Discussion About Improvements In the Designmentioning

confidence: 99%

Section: Generator Topologymentioning

confidence: 99%

A Step-by-Step Procedure to Perform Preliminary Designs of Salient-Pole Synchronous Generators

2021

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“…The dynamic behavior of the temperature in the windings must therefore be calculated. In this case, the use of a lumped parameter thermal model [30] is adapted and has shown its efficiency for EESG [31,32]. Figure 5 represents the equivalent circuit used to calculate the temperature evolution in the rotor and stator windings.…”

Section: Thermal Modelmentioning

confidence: 99%

Design Optimization of a Direct-Drive Electrically Excited Synchronous Generator for Tidal Wave Energy

et al. 2022

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In the field of marine renewable energies, the extraction of marine currents by the use of tidal current turbines has led to many studies. In contrast to offshore wind turbines, the mass minimization is not necessarily the most important criterion. In that case, Direct-Drive Electrically Excited Synchronous Generators (EESG) can be an interesting solution in a context where the permanent magnet market is more and more stressed. In the particular case of a tidal turbine, the electric generator operates at variable torque and speed all the time. Its sizing must therefore take into account the control strategy and check that all the constraints are respected during the working cycle, particularly the thermal one because its permanent regime is never reached. There is no solution today that can completely solve such a sizing problem. The paper presents a specific solution. In particular, we will see that the method presented allows an avoidance of an oversizing of the generator compared to conventional methods while finding the optimal control strategy. Thus, the design optimization of an EESG is conducted considering the variable torque and speed profiles related to marine currents. The analytical model used in the paper is presented at first. In a second step, the innovative and original method that allows solving at the same time the design optimization and the control strategy (dq stator currents and rotor current) are presented. It shows how it is possible to minimize both the lost energy during the working cycle and the mass while fulfilling all the constraints (especially the thermal constraint with its transient temperature response) and keeping a reduced computation time. The case of a 2 MW tidal wave turbine is chosen to illustrate this study. Finally, the optimal design selected is validated by a 2D magnetic Finite Element Analysis (FEA).

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“…Today, four-pole high megawatt solid salient rotor synchronous generators are widely used as high-power machinery in industrial applications, such as the marine, renewable energy, and oil and gas sectors. These four-pole synchronous machines with solid salient pole rotors have several advantages, such as high efficiency and low noise and vibration, but they need to have excellent thermal stability [1]. Therefore, it is necessary to investigate the machine's thermal stability by simultaneously developing a thermal analysis method with electromagnetic design.…”

Section: Introductionmentioning

confidence: 99%

Steady-State Thermal Modeling of Salient Pole Synchronous Generator

et al. 2022

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This paper presents a practical thermal model of a synchronous generator for high-power applications. This model couples the lumped parameter thermal network and coolant network together to utilize the impact of the coolant’s temperature rising over the machine. Furthermore, the advanced multi-planes technique provides a more precise and higher resolution temperature distribution of various machine sections. Therefore, the machines are divided into five planes; three belong to the active part, and two are added to model the machine’s drive and non-drive end-regions. Furthermore, the paper pays special attention to describing the challenges and providing solutions to them during the heat transfer modeling and analysis. Finally, the analytical model is verified using experimental results on a synchronous generator with a salient pole rotor and an open self-ventilation (OSV) cooling system by comparing the analytical and experimental results. As a result, good correspondence between the estimated and measurement results is achieved.

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Thermal Analysis of Salient Pole Synchronous Machines by Multiple Model Planes Approach

Cited by 9 publications

References 26 publications

A Step-by-Step Procedure to Perform Preliminary Designs of Salient-Pole Synchronous Generators

A Step-by-Step Procedure to Perform Preliminary Designs of Salient-Pole Synchronous Generators

Design Optimization of a Direct-Drive Electrically Excited Synchronous Generator for Tidal Wave Energy

Steady-State Thermal Modeling of Salient Pole Synchronous Generator

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