Improved finite element computations of torque in brushless permanent magnet motors

Popescu, Mircea; Ionel, Dan M.; Miller, T.J.E.; Dellinger, S.J.; McGilp, M.I.

doi:10.1049/ip-epa:20055107

Cited by 35 publications

(5 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The actuator forces were calculated using the virtual work method described in Coulomb (1983), Coulomb and Meunier (1984), Dede et al (2014), Pereirinha and Antunes (1996), Popescu et al (2005), Fu et al (2004).…”

Section: Developed Modelmentioning

confidence: 99%

Implementation of the sliding-line technique in a MEC model of a linear bistable actuator

Utegenova

2021

COMPEL

View full text Add to dashboard Cite

Purpose The aim of this study is to investigate the implementation of the sliding-line technique (SLT) in a generic two-dimensional (2D) nonlinear adaptive magnetic equivalent circuit (MEC) model predicting the electromagnetic force evolution of a linear bistable electromagnetic actuator technology. Design/methodology/approach The developed MEC model considers the saturation effect and the auto-adjustability of the spatial discretisation. The connection between static and mobile zones is ensured by an approach known as “air-gap sliding-line technique”, which is widely used for rotary electric motor models. To the best of the author’s knowledge, that is the first time that the SLT is implemented on an electromagnetic structure with linear motion. Findings It was found that, in case of a linear actuator with a relatively small working stroke, the implementation of the SLT could lead to some non-negligible inaccuracies. Originality/value To solve the above-mentioned problem, it was proposed to investigate the implementation of a single SLT vs double SLT. The results of the MEC models were compared with the 2D finite-element analysis (FEA) as well as with the experimental test results. The developed semi-analytical models can be easily adapted to other topologies of linear electromagnetic machines.

show abstract

Section: Developed Modelmentioning

confidence: 99%

Implementation of the sliding-line technique in a MEC model of a linear bistable actuator

Utegenova

2021

COMPEL

View full text Add to dashboard Cite

show abstract

“…According to the virtual work principle and law of energy conversion, the torque of a lossless IPM machine can be defined as Equation (2) [20,21].…”

Section: Torque Componentsmentioning

confidence: 99%

Analysis of Torque Ripple of a Spoke-Type Interior Permanent Magnet Machine

et al. 2020

View full text Add to dashboard Cite

This paper investigates the theoretical reasons behind the low torque ripple of a fractional-slot concentrated-winding (FSCW) spoke-type interior permanent-magnet (IPM) machine obtained via a genetic algorithm-based optimization. To better understand the torque performance of the IPMM, this paper uses the frozen permeability method to segregate the overall torque into four components—magnet torque, reluctance torque, cogging torque, and the torque caused by cross-magnetization. Equations and detailed procedures of the torque separation method are discussed in the paper. Analysis of the separated torque components reveals that the counteraction between ripples of different torques leads to the low torque ripple. At high-load conditions, the magnetic saturation alters the torque ripples caused by cross-magnetization to offset ripples of other components resulting in minimization of the overall torque ripple. A detailed parametric analysis of the geometric parameters was carried out to understand their effect in producing minimum torque ripple in the optimized design. In the end, a prototype was built and used for the verification of the torque separation method and the analytical findings based on it.

show abstract

“…Therefore, in (12), only the first two terms on the right side need to be considered. Following the same principle, using Taylor's series expansion and neglecting high order differentiation terms with coefficients , with , the following terms appearing in (11) may be simplified to (13) (14) (15) Substituting (13), (14), and (15) into (11), the converted mechanical energy may then be expressed as (16) Then according to (6), the torque equation may finally be expressed as (17) Comparing (17) with (3), (4), and noticing that armature current , and equivalent PM current are defined for an arbitrary rotor position, the torque equation may be written more compactly as (18) As discussed above, the equivalent PM current in (18) is governed by (4), and may be simplified to (5). Therefore, (18) may be further simplified to (19) This is the final torque equation proposed for prediction of the instantaneous torque accounting for saturation effects.…”

Section: Analytical Torque Analysis Based On the Electromechanicmentioning

confidence: 99%

“…The virtual work method calculates first the energy (or co-energy), and then performs partial differentiation of the energy (or co-energy) with respect to the rotor position, while holding the flux linkage (or current) constant [15], [16]. Similarly to the virtual work method, the flux-MMF diagram technique [17], [18] is also an energy based torque calculation method, which does not require holding the current (or flux linkage) constant during the torque calculation.…”

Section: Introductionmentioning

confidence: 99%

Torque Analysis With Saturation Effects for Non-Salient Single-Phase Permanent-Magnet Machines

Ritchie

2011

IEEE Trans. Magn.

View full text Add to dashboard Cite

The effects of saturation on torque production for non-salient, single-phase, permanent-magnet machines are studied in this paper. An analytical torque equation is proposed to predict the instantaneous torque with saturation effects. Compared to the existing methods, it is computationally faster and easier to calculate the torque using the analytical equation proposed. It can also handle arbitrary armature current waveforms and arbitrary flux linkage waveforms produced by the rotor permanent magnets. The results obtained by using the proposed torque equation are validated using finite-element results, and experimental results obtained on a prototype single-phase permanent-magnet machine.

show abstract

Improved finite element computations of torque in brushless permanent magnet motors

Cited by 35 publications

References 10 publications

Implementation of the sliding-line technique in a MEC model of a linear bistable actuator

Implementation of the sliding-line technique in a MEC model of a linear bistable actuator

Analysis of Torque Ripple of a Spoke-Type Interior Permanent Magnet Machine

Torque Analysis With Saturation Effects for Non-Salient Single-Phase Permanent-Magnet Machines

Contact Info

Product

Resources

About