Design Aspects of High-Speed Electrical Machines With Active Magnetic Bearings for Compressor Applications

Uzhegov, Nikita; Смирнов, А. В.; Park, Cheol Hoon; Ahn, Jiyun; Heikkinen, Janne; Pyrhönen, Juha

doi:10.1109/tie.2017.2698408

Cited by 86 publications

(30 citation statements)

References 30 publications

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“…AC electric drives are used in a wide variety of industrial applications such as in compressors [1], in electric vehicle propulsion systems [2,3] and in more electric aircraft (MEA) [4], among others. Although three-phase systems dominate the AC drive market, multiphase solutions are gaining popularity [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

New Modulation Technique to Mitigate Common Mode Voltage Effects in Star-Connected Five-Phase AC Drives

et al. 2020

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Star-connected multiphase AC drives are being considered for electromovility applications such as electromechanical actuators (EMA), where high power density and fault tolerance is demanded. As for three-phase systems, common-mode voltage (CMV) is an issue for multiphase drives. CMV leads to shaft voltages between rotor and stator windings, generating bearing currents which accelerate bearing degradation and produce high electromagnetic interferences (EMI). CMV effects can be mitigated by using appropriate modulation techniques. Thus, this work proposes a new Hybrid PWM algorithm that effectively reduces CMV in five-phase AC electric drives, improving their reliability. All the mathematical background required to understand the proposal, i.e., vector transformations, vector sequences and calculation of analytical expressions for duty cycle determination are detailed. Additionally, practical details that simplify the implementation of the proposal in an FPGA are also included. This technique, HAZSL5M5-PWM, extends the linear range of the AZSL5M5-PWM modulation, providing a full linear range. Simulation results obtained in an accurate multiphase EMA model are provided, showing the validity of the proposed modulation approach.

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Section: Introductionmentioning

confidence: 99%

New Modulation Technique to Mitigate Common Mode Voltage Effects in Star-Connected Five-Phase AC Drives

et al. 2020

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“…Besides, with Gramme-ring windings, the difficulty in the motor cooling will be further enhanced, because of extra copper loss of windings in the outer slots of the stator core. Moreover, the mechanical strength of the surface-mounted HSPMM rotor is not only threatened by large centrifugal force but also massive impact imposed by alternator discharge for this application [4][5][6][7]. Herein a considerable thick carbon-fibre retaining sleeve is mounted outside of the rotor to ensure the mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of a Gramme‐ring‐winding high‐speed permanent‐magnet motor for pulsed alternator using CFD

Wan

Guo

et al. 2020

IET Electric Power Applications

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Due to the merit of very‐short end turns, Gramme‐ring windings are widely used in high‐speed permanent‐magnet motors (HSPMMs). This study investigated the thermal issues of a 300 kW, 12,000 rpm Gramme‐ring‐winding HPSMM with housing water jacket and forced air cooling, based on the computational fluid dynamics (CFD) and numerical heat‐transfer calculations. The reasons that cause the overheat of the prototype in the experimental test are thoroughly analysed. The high wind resistance of air gap as the ventilation duct and the large interface gap between the stator lamination and housing water jacket is thought to be the main reasons. Then improvement of the ventilation structures is studied to decrease the wind resistance. Besides, the modification of water channels is also investigated to avoid the influence of a large interface gap on the water cooling performance. Finally, a new cooling structure, combining the slot ventilation ducts and inside water channels, is proposed for the HSPMM with Gramme‐ring windings. With the new cooling structure, the temperature rise of the motor is decreased, and the power density can be increased.

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“…In the current waste heat power system, a low-speed induction generator is used, which is connected to the turbine by the gearbox and screw rod [1]. Due to the use of screw rod and gearbox, low transmission efficiency and service life are presented in the conventional power system [2,3]. To improve these problems, a direct drive waste heat power system with high-speed generators has been widely concerned, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Multiphysics analysis of high‐speed permanent magnet generators for waste heat application

Huang

2020

IET Electric Power Applications

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In the direct drive waste heat power system, the turbine is directly connected to high-speed permanent magnet generators (HSPMGs), and the transmission efficiency, service life and system volume can be obviously improved by removing the gearbox and screw rod. However, in the design of high-speed electrical machines, a comprehensive multiphysics analysis must be conducted in order to meet various requirements of electromagnetic, mechanical and thermal specifications simultaneously. The design of one HSPMG by the multiphysics approach for the electromagnetic and loss characteristics, rotor stress, rotor dynamics and fluid-thermal parameters, which satisfies all specified multiphysics constraints, is presented. The theoretical results are confirmed by the experimental results on a prototype in terms of electromagnetic, mechanical and thermal characteristics, such as induced voltage, load current, rotor continuous operation and temperature distribution.

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Design Aspects of High-Speed Electrical Machines With Active Magnetic Bearings for Compressor Applications

Cited by 86 publications

References 30 publications

New Modulation Technique to Mitigate Common Mode Voltage Effects in Star-Connected Five-Phase AC Drives

New Modulation Technique to Mitigate Common Mode Voltage Effects in Star-Connected Five-Phase AC Drives

Thermal analysis of a Gramme‐ring‐winding high‐speed permanent‐magnet motor for pulsed alternator using CFD

Multiphysics analysis of high‐speed permanent magnet generators for waste heat application

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