Design of high-speed synchronous reluctance machines

Cupertino, Francesco; Palmieri, Marco; Pellegrino, Gianmario

doi:10.1109/ecce.2015.7310341

Cited by 17 publications

(14 citation statements)

References 12 publications

(12 reference statements)

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“…The mechanical problems are solved by the correct sizing of the radial ribs. Several authors deal with this problem [39][40][41]. The centrifugal force is given according to:…”

Section: New Trends In Electrical Vehicle Powertrainsmentioning

confidence: 99%

Reliable Design of PMaSynRM

López-Torres¹,

Garcia-Espinosa²,

Riba³

2019

New Trends in Electrical Vehicle Powertrains

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Electric vehicles require highly reliable and resilient electric motors, due to the harsh operating conditions they must withstand. To this end, there is a current trend to design rareearth-free machines. Traction electric motors must be optimized in terms of efficiency, torque density, power factor, constant power speed ratio, and cost. Although different technologies are available, permanent magnet assisted synchronous reluctance motors (PMa-SynRM) are promising candidates for such applications. Nowadays, the optimal design process of electrical motors is based on finite element method (FEM) simulations. However, it is very time consuming with a heavy computational burden process, so in order to speed up the optimization process, it is very appealing to have an accurate pre-design of the machine. In this chapter, the electromagnetic pre-design of a PMaSynRM is developed. In the proposed electromagnetic pre-design process, the geometry of the machine is calculated based on analytical equations that take into account the thermal, electrical, magnetic, and mechanical behavior of the machine to ensure a suitable and reliable design.

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“…The mechanical problems are solved by the correct sizing of the radial ribs. Several authors deal with this problem [39][40][41]. The centrifugal force is given according to:…”

Section: New Trends In Electrical Vehicle Powertrainsmentioning

confidence: 99%

Reliable Design of PMaSynRM

López-Torres¹,

Garcia-Espinosa²,

Riba³

2019

New Trends in Electrical Vehicle Powertrains

View full text Add to dashboard Cite

show abstract

“…The adoption of multi-objective optimization aided by finite element analysis is a powerful tool for a large class of engineering problems; recent examples of similar procedures applied to the design of electrical machines are reported in [31][32][33][34][35][36][37][38]. One of the main drawbacks that is related to this approach is the required computational burden, which highly increases with the number of the cost functions and the dimension of the search space; moreover, the adoption of FEA furtherly lengthen the time required for evaluating each machine.…”

Section: Multi-objective Optimizationmentioning

confidence: 99%

“…Here, for sake of simplicity and readability of the results, a two-objective optimization is performed. Differently from the approach adopted in other works dealing with the design of electrical machines through multi-objective optimization [31,[33][34][35][36][37], the cost functions that were selected for this particular application are the weight of the permanent magnets and the weight of the copper. As explained in the section dedicated to the machine parameterization, the axial length of the machines is adapted so to match the target torque T target , and then all of the machines in the Pareto front will share the same torque and the same current density.…”

Section: Cost Functionsmentioning

confidence: 99%

Wind Micro-Turbine Networks for Urban Areas: Optimal Design and Power Scalability of Permanent Magnet Generators

et al. 2018

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This work is focused on the design optimization of electrical machines that are used in small-scale direct-drive aerogenerators. A ducted wind turbine, equipped with a diffuser, is considered due to its enhanced power capability with respect to bare turbines. An annular type Permanent Magnet brushless generator is integrated in the turbine structure: the stator coils are placed in the internal part of the diffuser, whereas the permanent magnets are on an external ring connected to the turbine blade tips. Moreover, as regards the stator windings, the Printed Circuit Board (PCB) technology is investigated in order to exploit its advantages with respect to conventional wire coils, such as the increased current density capacity, the reduction of costs, and the enhanced precision and repeatability of the PCBs. An original design procedure is presented together with some scalability rules. An automated tool has been developed in order to aid the electrical machine designer in the first design stages: the tool performs multi-objective optimizations (using the Matlab Genetic Algorithm Toolbox), coupled to fast Finite Element analysis (through the open-source software FEMM) for the evaluation of the electromagnetic torque and field distribution. The proposed procedure is applied to the design of an annular PM generator directly coupled to a small-scale turbine for an urban application.

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“…Power density is typically increased with the rotational speed, but this limits the torque capability due to the increased size of the mechanical retaining system. To find the speed at which the output power is maximised, the rotational speed is included among the parameters to be optimised, together with stator and rotor geometric parameters, as first suggested in [11] for synchronous reluctance machines. A multi-objective optimisation algorithm was adopted to find the best compromise between power density, power factor (PF), and PM quantity.…”

Section: Introductionmentioning

confidence: 99%

Maximisation of power density in permanent magnet machines with the aid of optimisation algorithms

Cupertino

Leuzzi

Monopoli

et al. 2018

IET Electric Power Applications

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This study considers the design of surface-mounted permanent magnet electrical machines for high-speed applications and proposes a methodology to determine the maximum achievable power density. Power density is usually improved by increasing rotational speed. At high speed, a mechanical retaining system for the rotor magnets must be considered. As the speed increases, the thickness of the retaining sleeve becomes larger, reducing torque capability. There will be an optimal speed at which the output power will be maximised. Both structural and electromagnetic design must be considered simultaneously to properly address this design problem. To simplify the design procedure, static finite-element simulations are used for the electromagnetic analysis and analytical formulae are employed for retaining sleeve sizing. The procedure is aided by multi-objective optimisation algorithms. A case study based on the specification of an aeronautical actuator is presented. The performances that can be obtained using different iron cores, high-grade silicon steel, and cobalt iron steel are compared. Finally, results obtained from transient finite-element electromagnetic and structural analysis are presented to validate the feasibility of the proposed procedure.

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Design of high-speed synchronous reluctance machines

Cited by 17 publications

References 12 publications

Reliable Design of PMaSynRM

Reliable Design of PMaSynRM

Wind Micro-Turbine Networks for Urban Areas: Optimal Design and Power Scalability of Permanent Magnet Generators

Maximisation of power density in permanent magnet machines with the aid of optimisation algorithms

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