Computation of magnetic field in DC brushless linear motors built with NdFeB magnets

Basak, A.; Shirkoohi, G.H.

doi:10.1109/20.106475

Cited by 22 publications

(10 citation statements)

References 1 publication

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“…is defined as the winding factor of the th harmonic and is given by (8) and is the coefficient related to the th harmonic in the radial field distribution and is given by (9) Hence, the induced emf per phase is obtained as (10) where is the velocity of the armature. Fig.…”

Section: Emf and Force Predictionmentioning

confidence: 99%

Analysis and Design Optimization of an Improved Axially Magnetized Tubular Permanent-Magnet Machine

Wang

Howe

Jewell

2004

IEEE Trans. On Energy Conversion

107

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Abstract-This paper describes the analysis and design optimization of an improved axially magnetized tubular permanentmagnet machine. Compared with a conventional axially magnetized tubular machine, it has a higher specific force capability and requires less permanent-magnet material. The magnetic field distribution is established analytically in the cylindrical coordinate system, and the results are validated by finite-element analyses. The analytical field solution allows the analytical prediction of the thrust force and back-electromotive force (emf) in closed forms, which, in turn, facilitates the characterization of a machine, and provides a basis for design optimization and system dynamic modeling.Index Terms-Linear motors, permanent-magnet motors, system analysis and design.

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Section: Emf and Force Predictionmentioning

confidence: 99%

Analysis and Design Optimization of an Improved Axially Magnetized Tubular Permanent-Magnet Machine

Wang

Howe

Jewell

2004

IEEE Trans. On Energy Conversion

107

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“…The actuator electro-magnetic designs were initially dimensioned via analytic procedures [2,3] taking into account the volumetric and environmental constraints. Subsequent detailed finite element analysis [4] was undertaken to confirm the final analytic designs, examples of which are illustrated in Fig.…”

Section: Static and Dynamic Actuator Designsmentioning

confidence: 99%

Novel electro-magnetic test facility for the calibration of a propulsor fluctuating force module

Schofield¹,

Lonsdale²,

Hodges³

2004

Journal of Magnetism and Magnetic Materials

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“…The distribution factor is given by , and is the same as that for the brushless dc winding. The instantaneous power of each phase when excited with current is given by (13) and the instantaneous force is (14) However, the current is related to the total slot area per pole per phase , the coil packing factor , the current density , and the number of turns per coil by (15) thus (16) where . For a three-phase machine carrying balanced sinusoidally time-varying currents, the current density in the phase windings is given by (17) where is the rms current density and is the electrical angular frequency, which is related to the armature velocity by .…”

Section: Flux-linkage Emf and Thrust Forcementioning

confidence: 99%

“…However, while this allows the relationship between critical design parameters and machine performance to be established analytically, it suffers from problems associated with model inaccuracy, particularly when the leakage flux is sig- nificant and the flux paths are complex. Therefore, numerical analysis of the field distribution to facilitate evaluation of performance is also employed [11]- [13]. However, while numerical techniques, such as finite-element analysis, provide an accurate means of determining the field distribution, with due account of saturation, etc., they remain relatively time-consuming and do not provide as much insight as analytical solutions into the influence of the design parameters on the machine behavior.…”

mentioning

confidence: 99%

Design Optimization of Radially Magnetized, Iron-Cored, Tubular Permanent-Magnet Machines and Drive Systems

2004

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Abstract-In this paper we deduce, from analytical field solutions, the influence of leading design parameters on the performance of a radially magnetized, iron-cored, tubular permanent-magnet machine and its drive system. We derive analytical formulas for predicting the open-circuit electromotive force, the thrust force, the iron loss, and the winding resistance and inductances, as well as the converter losses. The force density, the machine and drive system efficiencies, and the power factor and converter volt-ampere (VA) rating are established as functions of a set of machine dimensional ratios, with due account of magnetic saturation and subject to a specified thermal constraint. We validate the utility and accuracy of the analytically derived formulas by finite-element calculations. Finally, we show that the design optimization of such a linear drive system must account for the losses and VA rating of the converter as well as the design parameters of the tubular machine.

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Computation of magnetic field in DC brushless linear motors built with NdFeB magnets

Cited by 22 publications

References 1 publication

Analysis and Design Optimization of an Improved Axially Magnetized Tubular Permanent-Magnet Machine

Analysis and Design Optimization of an Improved Axially Magnetized Tubular Permanent-Magnet Machine

Novel electro-magnetic test facility for the calibration of a propulsor fluctuating force module

Design Optimization of Radially Magnetized, Iron-Cored, Tubular Permanent-Magnet Machines and Drive Systems

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