Analysis of Magnetizing Trajectories for Variable Flux PM Synchronous Machines Considering Voltage, High-Speed Capability, Torque Ripple, and Time Duration

Gagas, Brent S.; Sasaki, Kensuke; Fukushige, Takashi; Athavale, Apoorva; Kato, Takashi; Lorenz, Robert D.

doi:10.1109/tia.2016.2582119

Cited by 74 publications

(17 citation statements)

References 17 publications

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“…The d-axis HF impedance, (10), can be obtained either from the positive or negative sequence components, (8) and (9), ϕ Z dHF (11) being the phase of the d-axis HF impedance (10). The d-axis HF inductance can be obtained from (12).…”

Section: Hf Inductance Estimation Using Pulsating Hf Current Injmentioning

confidence: 99%

Magnet Temperature Estimation in Permanent Magnet Synchronous Machines Using the High Frequency Inductance

Reigosa

Fernández

Martinez

et al. 2019

IEEE Trans. on Ind. Applicat.

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Permanent magnet synchronous machines (PMSMs) torque production capability depends on the permanent magnets (PMs) magnetization state, which can be affected by PMs temperature and of the current flowing throughout the stator windings; knowledge of the PMs temperature can be therefore of great importance both for control and monitoring purposes. PMs temperature can be measured or estimated; PM temperature measurement is not easy and is not normally implemented in commercial drives. PM temperature estimation methods can be divided into thermal models based, BEMF based and signal injection based methods. Existing HF signal injection methods estimate the PM temperature from the measured stator HF resistance. Unfortunately the resistance is also affected by magnetoresistive effect, which can limit the accuracy of the estimates. This paper proposes the use of the stator d-axis HF inductance for PM temperature estimation. This makes temperature estimation insensitive to magnetoresistive effect. In addition, it allows the use of higher frequencies, reducing the adverse impact of the injected signal on machine performance. 1

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Section: Hf Inductance Estimation Using Pulsating Hf Current Injmentioning

confidence: 99%

Magnet Temperature Estimation in Permanent Magnet Synchronous Machines Using the High Frequency Inductance

Reigosa

Fernández

Martinez

et al. 2019

IEEE Trans. on Ind. Applicat.

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“…Further development of the operational principle requires an understanding of the mathematical model of a PM machine. The dynamic model of a PM machine can be written in the d-q synchronous reference frame as [44], [45]:…”

Section: Vfm Principle Of Operationmentioning

confidence: 99%

A Review on Variable Flux Machine Technology: Topologies, Control Strategies and Magnetic Materials

2019

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Modern applications demand challenging operation requirements from electrical machines. Variable-flux machine (VFM) concepts are found to offer new opportunities for improved machine design. This paper reviews the VFM technology. Three topologies, mainly the parallel hybrid VFMs, series hybrid VFMs, and variable-flux flux intensifying type VFMs are discussed in detail. The variable-flux flux Intensifying machines are found to be the state-of-the-art VFM technology available to-date. The paper also reviews the magnetization process in the VFMs and relates this with the B-H curve of the magnetic material. The conventional PM machine mathematical model is adapted to represent the operation of the VFMs. The different operational limitations of the VFMs are explained and the different modes of operation of the VFMs have been reviewed and compared. The magnetization state manipulation techniques are reviewed. The AC magnetization is found to be the more preferable approach to reduce weight and manufacturing complexity of the VFMs. The trapezoidal current pulse based approach is popular in AC magnetization state manipulation, however, new advanced forms of current vector trajectory control techniques offer comparatively better magnetic state manipulation and higher speed capability for remagnetization of the magnets in the VFMs. The paper also reviews the different magnetization state estimation techniques that are useful during control systems development for the VFMs. The magnetic material for the VFM design is reviewed and potential alternative magnetic material that can satisfy the requirements of the VFMs have been identified. Finally, the current status, challenges, and the potential of VFMs technology are discussed in the conclusion of the paper.INDEX TERMS Variable flux machines, wide speed range, permanent magnet machines, field weakening, magnetic material, magnetization, demagnetization, machine design.

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“…However, the torque ripple of permanent magnet machine at low speed is still urgent to be solved. The main solutions to reduce the torque ripple are suitable permanent magnet structure design, well matching of pole and slot numbers, and skew-slot order to reduce the cogging torque and torque ripple of the permanent magnet machines, a lot of research has been carried out [6][7][8]. The main measures are using unequal thickness permanent magnets, adopting the auxiliary slot, and adopting skew-slots [9,10].…”

Section: Introductionmentioning

confidence: 99%

Torque Analysis and Dynamic Performance Improvement of a PMSM for EVs by Skew Angle Optimization

Shi

Sun

Cai

et al. 2019

IEEE Trans. Appl. Supercond.

108

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In this paper, a permanent magnet synchronous machine (PMSM) for electric vehicles (EVs) is studied. Since EVs need to face some low speed road conditions, it is necessary to drive the machine to maintain a stable torque at low speed. The stator skew slot is often adopted to reduce torque ripple; however, it declines the output torque at same time. Besides, the difference between positive rotation performance and negative rotation performance which caused by the skew slot are often ignored. Through the finite element analysis (FEA), the cogging torque and dynamic performance of the PMSM at different skew angle are studied. Moreover, the different influence of slot skew angle on positive and negative rotation performance is studied. Then the optimum skew angle of the PMSM is studied through comprehensive consideration. Finally, the cogging torque of the prototype is verified to be less than 2 N.m. through the experiment. Index Terms-electric vehicles; finite element analysis; skew angle; torque ripple

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Analysis of Magnetizing Trajectories for Variable Flux PM Synchronous Machines Considering Voltage, High-Speed Capability, Torque Ripple, and Time Duration

Cited by 74 publications

References 17 publications

Magnet Temperature Estimation in Permanent Magnet Synchronous Machines Using the High Frequency Inductance

Magnet Temperature Estimation in Permanent Magnet Synchronous Machines Using the High Frequency Inductance

A Review on Variable Flux Machine Technology: Topologies, Control Strategies and Magnetic Materials

Torque Analysis and Dynamic Performance Improvement of a PMSM for EVs by Skew Angle Optimization

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