Dynamic Modeling of Brushless dc Motors for Aerospace Actuation

Demerdash, Nabeel A. O.; Nehl, T. W.

doi:10.1109/taes.1980.309005

Cited by 96 publications

(29 citation statements)

References 12 publications

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“…In (5) r b represents a damper bar resistance and r c =r 0 c are resistances of end ring connector segments [1,2]. It should be mentioned that the skin effect is included using conventional techniques such as described by Nilsson [7].…”

Section: State-space Modelmentioning

confidence: 99%

“…A considerable amount of investigation in the area of modeling techniques and parameter as well as performance simulation of electric machinery interfaced with power electronically switched power supplies or loads has been done in the past [4][5][6][7][8][9]. In these works time-domain models were developed in lieu of phasor-type frequency domain analysis [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…In these works time-domain models were developed in lieu of phasor-type frequency domain analysis [4][5][6][7][8][9]. However some of these approaches were carried out in the dq0 frame with all its associated assumptions of neglect of saturation and higher order space harmonics in flux linkages, etc.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6]. Others were done in the ABC frame, without enough rigor in representing the damper cage with sufficient degrees of freedom (current state) to allow the incorporation of the full nature of the magnetic coupling between such damper cage and corresponding armature as well as field winding under fully saturated conditions [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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CFE-SS approach for salient-pole synchronous generators under unbalances

Deng

Demerdash²

1997

IEEE Trans. Aerosp. Electron. Syst.

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A time-stepping coupled finite element-state space approach was developed for synchronous machine unbalanced impedance load and balanced/unbalanced rectifier load operation, in the natural time-domain ABC frame of reference. Synergism between the space and time harmonics was inherently included in the simulated results by use of this approach. It offers an effective and powerful tool for synchronous machine design before prototype construction. A time-stepping coupled finite element-state space (CFE-SS) algorithm is applied to the modeling and analysis of the time-domain steady-state performance of high speed salient-pole synchronous generators when feeding unbalanced loads under sustained durations. This includes the effects of such unbalances on individual damper bar time-domain current profiles and losses, iron core losses, machine parameters (inductances) and other performance characteristics. For practical types of ac aircraft generator unbalances detailed in this work, it was found that such losses can increase by as much as 33.80% of their values under balanced steady-state rated load condition for an example 2-pole, 120 kVA, 24000 r/min salient-pole synchronous generator.

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Section: State-space Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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CFE-SS approach for salient-pole synchronous generators under unbalances

Deng

Demerdash²

1997

IEEE Trans. Aerosp. Electron. Syst.

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“…T HE design and modeling of PM motors has consistently been a subject of special interest in the literature [1][2][3][4][5][6]. Recent design trends rely on large-scale design optimization techniques based on electromagnetic (EM) finite element (FE) analysis of design candidates for high fidelity calculation of their performance metrics [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Identification of design rules for interior PM motors with different cooling systems

Fatemi

Ionel

Demerdash

2015

2015 IEEE International Electric Machines &Amp; Drives Conference (IEMDC)

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The conventional scaling rules for the optimal design of electric machines are best suited for naturally cooled machines with stator winding current densities less than 4A/mm 2 . In this paper, through a comprehensive sensitivity analysis, first, it is demonstrated that the correlations between some geometric variables and the performance metrics of interior permanent magnet (IPM) motors vary significantly with respect to the stator winding current density. For this purpose, three current densities are selected so as to approximately account for naturally cooled, fan-cooled and liquid-cooled machines. Subsequently, a parameterized IPM motor is optimized at these current densities through a large-scale design optimization algorithm by evaluating a total of 20,000 design candidates. The 100 best designs from each group are then identified and extracted to investigate the scaling rules for the optimal design of such IPM motors with different cooling systems. The outcomes of the study are in correspondence with the conventional design principles for naturally cooled machines. Nevertheless, it is illustrated that these rules vary for fan-cooled and liquid-cooled machines owing to the increased ampere loading, and also heavy saturation of the magnetic core in such machines. A configuration of a 50 hp, 48-slot, 8-pole IPM motor with a single-layer v-type magnet is used as the benchmark of this study.Index Terms-Machine modelling and general design, computer aided design, permanent magnet machines, finite-element analysis, sensitivity analysis, design of experiments, design optimization.

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