Rotor losses in fault-tolerant permanent magnet synchronous machines

Raminosoa, Tsarafidy; Gerada, Chris; Othman, Nazri; Lillo, Liliana De

doi:10.1049/iet-epa.2009.0287

Cited by 21 publications

(11 citation statements)

References 18 publications

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“…On the other hand, the torque waveforms and the rotor eddy current losses in faulty operating mode remain the same as to those in healthy mode for both the overlap 2/3 shorted pitch winding and the non-overlap one ( Fig.7 and 8). The underlying reason is the fact that tripplen harmonics are inexistent in the single phase MMF for a coil span of 120 degrees [6]. Thus, the whole harmonic armature reaction airgap field in faulty operation is identical to that of the healthy case.…”

Section: Influence Of Winding Configurationmentioning

confidence: 99%

“…This method keeps the same magnitude and direction (positive or negative) of the whole harmonic rotating field spectrum except for tripplen harmonics [6]. In fact, if tripplen harmonics occur in the single phase MMF, they do not cancel out when one phase is lost and generally create both positive and negative sequence fields, resulting in additional rotor losses.…”

Section: Introductionmentioning

confidence: 99%

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A High-Speed Permanent-Magnet Machine for Fault-Tolerant Drivetrains

Papini

Raminosoa

Gerada

et al. 2014

IEEE Trans. Ind. Electron.

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Section: Influence Of Winding Configurationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A High-Speed Permanent-Magnet Machine for Fault-Tolerant Drivetrains

Papini

Raminosoa

Gerada

et al. 2014

IEEE Trans. Ind. Electron.

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“…Their torque/force density capabilities [2,3] and the fault tolerance performances [4,5] the economic burden related to magnet material, other disadvantages concerning such machines are the always present no-load flux, the natural intolerance towards high temperatures [6] and the risk of irreversible demagnetisation.…”

Section: Introductionmentioning

confidence: 99%

Demagnetization Analysis for Halbach Array Configurations in Electrical Machines

et al. 2015

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-This paper proposes and investigates an analytical method for assessing the risk of potential, irreversible demagnetisation in the PMs of electrical machines, equipped with n-stages, Halbach arrays. The higher risk of demagnetisation, synonymous with Halbach arrays imposes that the method be both load and temperature dependant. In fact, the proposed method studies the magnetic field distribution in the air-gap and PM region, for various operating temperatures and expresses these fields as analytical expressions for the no-load and peak load conditions. The model can cater for Halbach arrays with up to n stages, thus making it a versatile tool that can be utilised for various Halbach configurations. Finite element analysis is used to validate the method.The analytical tool is then used for the design and analysis of a high torque density, outer rotor, traction motor. The motor is for an aerospace application and its operating duty cycle imposes very high, short time, peak load conditions at elevated temperatures, posing an elevated risk of irreversible, PM demagnetisation. The model is used to investigate various Halbach configurations for this application, in order to reduce the demagnetisation risk and also improve the general performance of the machine. The analytical method thus provides a computationally efficient tool that can be used to predict and prevent demagnetisation in Halbach-equipped, electrical machines operating in harsh environments such as the aerospace sector.

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“…By studying the interaction between MMF harmonics wavelengths and PM pole dimensions, a general analytical model of PM eddy-current losses is developed for comparison of multiphase PM machines [19,20]. The influence of post-fault control strategy and winding configuration on rotor losses is evaluated by both an analytical time-stepping model and a time harmonic current sheet method [21]. The impacts of slot harmonic and the number of phases on rotor losses in fractional-slot PM machines are investigated in [22].…”

Section: Introductionmentioning

confidence: 99%

Research on a 20-Slot/22-Pole Five-Phase Fault-Tolerant PMSM Used for Four-Wheel-Drive Electric Vehicles

Sui

Zheng

et al. 2014

Energies

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This paper presents a five-phase fault-tolerant permanent-magnet synchronous machine (PMSM) used for electric vehicles. In multiphase fault-tolerant PMSMs equipped with fractional-slot concentrated windings, excessive magneto-motive force (MMF) harmonics can lead to thermal demagnetization of the permanent magnets (PMs). In order to reduce the lower-order harmonics, the origins of the 2-pole harmonic in conventional winding configurations are investigated, and an unequal-turn winding configuration is applied to cancel the lower-order harmonics. The main electromagnetic performances of the unequal-turn winding configuration are investigated and compared with conventional winding topologies. Based on the principle of maintaining constant instantaneous power, the fault-tolerant control strategies for open-circuits of up to two phases are developed. All of the investigations are verified by finite element analysis (FEA) results.

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Rotor losses in fault-tolerant permanent magnet synchronous machines

Cited by 21 publications

References 18 publications

A High-Speed Permanent-Magnet Machine for Fault-Tolerant Drivetrains

A High-Speed Permanent-Magnet Machine for Fault-Tolerant Drivetrains

Demagnetization Analysis for Halbach Array Configurations in Electrical Machines

Research on a 20-Slot/22-Pole Five-Phase Fault-Tolerant PMSM Used for Four-Wheel-Drive Electric Vehicles

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