Traction PMASR Motor Optimization According to a Given Driving Cycle

Carraro, Enrico; Morandin, Mattia; Bianchi, Nicola

doi:10.1109/tia.2015.2477479

Cited by 115 publications

(31 citation statements)

References 24 publications

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“…For this reason, when the machine works, it becomes mandatory to optimize the design in the most profitable areas in which the motor operates, in order to improve the overall performance. On this basis, some recent researches [1]- [4] have introduced new design and optimization techniques for traction motors, in order to enhance the efficiency against a defined driving cycle. On the other hand, previous researches have investigated neither the optimization of the torque ripple, nor the robustness of the solution, over the aforementioned driving cycle.…”

Section: Introductionmentioning

confidence: 99%

Selection Criteria and Robust Optimization of a Traction PM-Assisted Synchronous Reluctance Motor

Degano

Carraro

Bianchi

2015

IEEE Trans. on Ind. Applicat.

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Abstract-In the coming years, the electrification and the deployment of the electric motors in the urban transports will become a reality more and more widespread. The optimization stage of the electric motors usually does not consider in detail the real driving conditions of the car in which the motor is installed. It follows that the actual motor performance in operating points, especially as regards the torque ripple and the efficiency, might be worsen than expected. A robust solution is a required target. This paper deals with the design and optimization of a high speed permanent magnet assisted synchronous reluctance motor for traction applications, taking into account of both city and highway driving cycles. A procedure is employed in order to evaluate the most representative operating points, which have to be considered for the global optimization. An analysis of the robustness of the solutions has been performed. Both results and advantages of the adopted methodology are highlighted. I. INTRODUCTIONThe progressive electrification of the private transport systems is becoming a well-established reality in the international scenario since it is seen as the most promising solution to reduce air pollution, oil dependency and to improve energy efficiency. As for convention internal combustion engine (ICE) vehicles, the performance of an electric vehicle are strictly related to the driving conditions of the car in which the motor is installed. On the other hand, the optimization procedure of the electric motors does not often consider the actual working conditions. For this reason, when the machine works, it becomes mandatory to optimize the design in the most profitable areas in which the motor operates, in order to improve the overall performance. On this basis, some recent researches [1]-[4] have introduced new design and optimization techniques for traction motors, in order to enhance the efficiency against a defined driving cycle. On the other hand, previous researches have investigated neither the optimization of the torque ripple, nor the robustness of the solution, over the aforementioned driving cycle. This paper aims to present an optimization procedure of a Permanent Magnet Assisted Synchronous Reluctance (PMASR) motor for traction application, considering a city and a highway driving schedule. The motor is equipped with a 36-slot 4-pole and an integral-slot distributed winding. A high grade Ferrite PM is considered. The interest in Ferritebased PMASR motors [5]-[8] is spreading in the last years, as a consequence of the instability and the increase of the price of rare earth magnets. Moreover, it provides a high flux weakening operating range, which is usually an important requirement in traction applications. Conversely, the most

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Section: Introductionmentioning

confidence: 99%

Selection Criteria and Robust Optimization of a Traction PM-Assisted Synchronous Reluctance Motor

Degano

Carraro

Bianchi

2015

IEEE Trans. on Ind. Applicat.

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“…One type increases reluctance torque by optimising the shape of flux barriers and/or adapting a multi‐barrier structure to the PM rotor, e.g. a permanent magnet (PM) assisted‐synchronous reluctance machine [1–5]. The other type increases magnet torque by adopting a flux‐concentrating rotor structure, e.g.…”

Section: Introductionmentioning

confidence: 99%

Performance comparison of a spoke‐type PM motor with different permanent magnet shapes and the same magnet volume

Jun

Kwon

2017

IET Electric Power Applications

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This study investigates the characteristics of a spoke-type permanent magnet (PM) motor with one of three magnet shapes, rectangular magnet (RM), trapezoidal magnet (TM), or inverted TM (ITM) in order to compare motor performance for the same magnet volume. The three magnet shapes vary in terms of upper thickness, lower thickness, and width of the magnet. Two-dimensional (2D) finite element method is performed to analyse torque, inductance, core loss, efficiency, and demagnetisation reliability. Advantages and disadvantages of each magnet shape are presented based on the analysis results. The ITM motor shows higher efficiency at its rated load due to the reduced core loss resulting from the decreased armature reaction field coupled with the increased magnetic reluctance circuit of the rotor near the airgap. However, the ITM motor shows lower maximum torque due to the reduced reluctance torque and demagnetisation reliability with a heavy over-current. ITM is thus suitable for applications that require low core loss with small starting torque, e.g. fans, TM is helpful for increasing maximum torque, and RM is appropriate for lowcost applications that require high demagnetisation reliability. Therefore, magnet shape should be carefully considered based on the required specifications of the motor application.

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“…One alternative is less-rare-earth interior permanent-magnet synchronous machines (LRE-IPMSMs), which make use of more reluctance torque and reduce the consumption of rare-earth materials. The LRE-IPMSMs adopt the rotor structure of multilayer flux barriers to obtain a high saliency ratio and improve the machine performance by inserting proper rare-earth PMs into flux barriers [6][7][8][9]. Hence, the arrangements of flux barriers and PMs are crucial to the LRE-IPMSMs.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Magnetic Circuit and Performance of Less-Rare-Earth Interior Permanent-Magnet Synchronous Machines Used for Electric Vehicles

Zheng

Wang

et al. 2017

Energies

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The less-rare-earth interior permanent-magnet synchronous machines (LRE-IPMSMs), which have the advantages of high power density, high efficiency, and low cost, are promising candidates for electric vehicles (EVs). In this paper, the equivalent magnetic circuit (EMC) of LRE-IPMSM is established and analyzed to investigate the machine design principles, and then the performance of an optimized machine is analyzed. Firstly, the equivalent magnetic circuits of the LRE-IPMSM are established by taking the saturation effect into consideration. Secondly, the effects of geometric parameters, such as the permanent-magnet (PM) width, the PM thickness, the flux barrier thickness, the flux barrier span angle, and the bridge width, on no-load flux, q-axis flux, and d-axis flux are investigated, respectively. The results calculated by the EMC method and finite-element analysis (FEA) are analyzed and compared, which proves the effectiveness of the EMC method. Finally, an optimized design of LRE-IPMSM obtained by the magnetic circuit analyses is proposed. The electromagnetic performances and mechanical strength of the optimized LRE-IPMSM are analyzed and verified, respectively.

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Traction PMASR Motor Optimization According to a Given Driving Cycle

Cited by 115 publications

References 24 publications

Selection Criteria and Robust Optimization of a Traction PM-Assisted Synchronous Reluctance Motor

Selection Criteria and Robust Optimization of a Traction PM-Assisted Synchronous Reluctance Motor

Performance comparison of a spoke‐type PM motor with different permanent magnet shapes and the same magnet volume

Investigation of the Magnetic Circuit and Performance of Less-Rare-Earth Interior Permanent-Magnet Synchronous Machines Used for Electric Vehicles

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