High-Frequency Effects in Modeling AC Permanent-Magnet Machines

Gabriel, Fabien

doi:10.1109/tie.2014.2327590

Cited by 10 publications

(2 citation statements)

References 25 publications

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“…The changing inductance will make the flux inside a motor nonuniform, which causes eddy currents to occur. The eddy current loss (induction loss) is a major loss in addition to Ohmic losses in the copper, hysteresis loss and mechanical loss [7,8,9], especially if a motor is running at high speed [10,11]. Recent studies also indicate that the induction loss also introduces distortions in MRI imaging systems [12].…”

Section: Introductionmentioning

confidence: 99%

A Nonlinear Circuit Analysis Technique for Time-Variant Inductor Systems

Wang

Song

et al. 2019

Sensors

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Time-variant inductors exist in many industrial applications, including sensors and actuators. In some applications, this characteristic can be deleterious, for example, resulting in inductive loss through eddy currents in motors designed for high efficiency operation. Therefore, it is important to investigate the electrical dynamics of systems with time-variant inductors. However, circuit analysis with time-variant inductors is nonlinear, resulting in difficulties in obtaining a closed form solution. Typical numerical algorithms used to solve the nonlinear differential equations are time consuming and require powerful processors. This investigation proposes a nonlinear method to analyze a system model consisting of the time-variant inductor with a constraint that the circuit is powered by DC sources and the derivative of the inductor is known. In this method, the Norton equivalent circuit with the time-variant inductor is realized first. Then, an iterative solution using a small signal theorem is employed to obtain an approximate closed form solution. As a case study, a variable inductor, with a time-variant part stimulated by a sinusoidal mechanical excitation, is analyzed using this approach. Compared to conventional nonlinear differential equation solvers, this proposed solution shows both improved computation efficiency and numerical robustness. The results demonstrate that the proposed analysis method can achieve high accuracy.

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Section: Introductionmentioning

confidence: 99%

A Nonlinear Circuit Analysis Technique for Time-Variant Inductor Systems

Wang

Song

et al. 2019

Sensors

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“…The square-wave current is always used to drive the trapezoidal back-EMF motor, which is called as PM BLDCM in general [11][12][13][14][15][16]. And the sinusoidal-wave current is always used to drive the sinusoidal back-EMF motor, which is called as PM BLACM in general [17][18][19][20]. These two current waveforms and their improvements have been used for several different motors [21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Parabola‐trapezoid and staircase current supply methods for PMBLM with full inverter utility and reduced torque ripple

Yang

Zhu

2018

IET Electric Power Applications

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The permanent magnet brushless motors (PMBLM) are utilised extensively in many high-performance applications where smoothness of output torque is necessary. When driven with conventional square-wave current, the PMBLM is hard to make full use of inverter capacity because of short current supply time. Besides, it is hard to produce smooth output torque because the phase inductances slow down the desired step response of the phase current seriously. Although the sinusoidalwave current changes continuously, there exists a fixed-frequency torque ripple for trapezoid back-electromotive force motor. To solve the problems, two novel current supply methods, called as staircase waveform and parabola-trapezoid waveform, are proposed in this study. With the same phase current magnitude as square waveform, the staircase waveform can output two times torque with low-resolution position sensors. The parabola-trapezoid supply method can further improve the smoothness of doubled output torque by unique parabolic rising and falling edge waveform design, while a high-resolution position sensor is needed. Simulation and experimental tests of four different current supply methods are given to corroborate the effectiveness of the proposed method in inverter utility and torque ripple reduction.

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Design consideration of interior permanent magnet machine position sensorless drive using square-wave voltage injection

Yang

2016

2016 IEEE Energy Conversion Congress and Exposition (ECCE)

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High-Frequency Effects in Modeling AC Permanent-Magnet Machines

Cited by 10 publications

References 25 publications

A Nonlinear Circuit Analysis Technique for Time-Variant Inductor Systems

A Nonlinear Circuit Analysis Technique for Time-Variant Inductor Systems

Parabola‐trapezoid and staircase current supply methods for PMBLM with full inverter utility and reduced torque ripple

Design consideration of interior permanent magnet machine position sensorless drive using square-wave voltage injection

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