Analytical Magnetic Field Calculation of Slotted Brushless Permanent-Magnet Machines With Surface Inset Magnets

Rahideh, Akbar; Korakianitis, Theodosios

doi:10.1109/tmag.2012.2200691

Cited by 70 publications

(62 citation statements)

References 41 publications

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“…Many analytical methods have been proposed for the PM machines without taking into account the slotting effect, and generally focus on the open-circuit field distribution. In [17][18][19][20], the stator slotting effect on the magnetic-field distribution is considered, which is critical for the accurate calculation of the cogging torque and PM eddy losses, etc. In [21][22][23][24], a 2-D analytical model has been proposed for the magnetic gear, where the modulation effect on the magnetic-field distribution can be evaluated.…”

Section: Analytical Modelingmentioning

confidence: 99%

Analytical Investigation of the Magnetic-Field Distribution in an Axial Magnetic-Field-Modulated Brushless Double-Rotor Machine

et al. 2016

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Abstract:The axial magnetic-field-modulated brushless double-rotor machine (MFM-BDRM) is a novel possible alternative power-split device for hybrid electric vehicles (HEVs). This paper proposes a two-dimensional (2-D) analytical method to predict the performance of the axial MFM-BDRM to reduce computing time. The computation is based on the solution of Laplace's or Poisson's equation with boundary conditions for each elementary rectangular region. By taking account of the existence of modulating ring and the stator slotting effect, the proposed model is able to calculate magnetic-field distribution with high accuracy. In order to assess the proposed method, the 2-D analytical and three-dimensional (3-D) finite element analysis (FEA) results have been compared, and good agreements have been achieved. As the analytical computation is much faster and more flexible, the proposed method can be used in the preliminary design process of the axial MFM-BDRM.

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Section: Analytical Modelingmentioning

confidence: 99%

Analytical Investigation of the Magnetic-Field Distribution in an Axial Magnetic-Field-Modulated Brushless Double-Rotor Machine

et al. 2016

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“…The field distribution can be estimated by means of the governing equations expressed in terms of magnetic vector potential [15][16][17]. Eddy-current effects are neglected in the following analysis, thus for the air-gap, stator and rotor regions, the governing equation is as described by (1), where A is the magnetic vector potential.…”

Section: A General Model Of the Pm Regionmentioning

confidence: 99%

“…2) The field distribution is evaluated neglecting the end region effects, thus leading to a simplified formulation of the problem by considering only the planar cross section orthogonal to the axial development of the device [13,[15][16][17][18]. Considering a polar coordinate reference frame, M can be decomposed in its radial M r and tangential Mϑ components as a function of the angular coordinate [16,17].…”

Section: A General Model Of the Pm Regionmentioning

confidence: 99%

“…Considering a polar coordinate reference frame, M can be decomposed in its radial M r and tangential Mϑ components as a function of the angular coordinate [16,17]. Considering that an n stg Halbach array structure consists of a number of magnet elements n pm with each element having a different magnetisation direction, then n pm is described by (3), while M is as given by (4).…”

Section: A General Model Of the Pm Regionmentioning

confidence: 99%

“…The general solution of (9) and (10) is given in (11) and (12), where C 1 , C 2 , C 3 , and C 4 are the integration constants, evaluated according to a consistent system of conditions on the boundary of the domain and on the separation surfaces between regions (for regions featuring different material properties) [13,16]. As proposed in [17], the parameter φ h which is described in (13) is used to define the particular solution of (12).…”

Section: B the Field Distribution Solutionmentioning

confidence: 99%

See 2 more Smart Citations

Demagnetization Analysis for Halbach Array Configurations in Electrical Machines

et al. 2015

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-This paper proposes and investigates an analytical method for assessing the risk of potential, irreversible demagnetisation in the PMs of electrical machines, equipped with n-stages, Halbach arrays. The higher risk of demagnetisation, synonymous with Halbach arrays imposes that the method be both load and temperature dependant. In fact, the proposed method studies the magnetic field distribution in the air-gap and PM region, for various operating temperatures and expresses these fields as analytical expressions for the no-load and peak load conditions. The model can cater for Halbach arrays with up to n stages, thus making it a versatile tool that can be utilised for various Halbach configurations. Finite element analysis is used to validate the method.The analytical tool is then used for the design and analysis of a high torque density, outer rotor, traction motor. The motor is for an aerospace application and its operating duty cycle imposes very high, short time, peak load conditions at elevated temperatures, posing an elevated risk of irreversible, PM demagnetisation. The model is used to investigate various Halbach configurations for this application, in order to reduce the demagnetisation risk and also improve the general performance of the machine. The analytical method thus provides a computationally efficient tool that can be used to predict and prevent demagnetisation in Halbach-equipped, electrical machines operating in harsh environments such as the aerospace sector.

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Improved electromagnetic models with saliency effect, a novel canned switched reluctance machine drive as example

Wang

Cheng

2017

Int J Numerical Modelling

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A canned electrical machine is featured by having a can shield in air gap as partition. Considerable ohmic loss generated from the can (can loss) is the most highlighted feature. In this paper, an analytical electromagnetic model is proposed to analyze can loss. The model is divided into calculation of magnetic vector potential and modeling of magnetic saturation. In particular, the loss influenced by salient poles is discussed. The studied canned machine is a 3‐phase 12/8 switched reluctance machine as a pump drive. It is stressed that we do not judge and discuss performance of the machine developed but propose a modeling approach to improve the loss calculation approach. The developed method has been validated with simulation and experiments. The model gives accurate calculation of losses for electrical machines of high magnetic saturation effect.

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Analytical Magnetic Field Calculation of Slotted Brushless Permanent-Magnet Machines With Surface Inset Magnets

Cited by 70 publications

References 41 publications

Analytical Investigation of the Magnetic-Field Distribution in an Axial Magnetic-Field-Modulated Brushless Double-Rotor Machine

Analytical Investigation of the Magnetic-Field Distribution in an Axial Magnetic-Field-Modulated Brushless Double-Rotor Machine

Demagnetization Analysis for Halbach Array Configurations in Electrical Machines

Improved electromagnetic models with saliency effect, a novel canned switched reluctance machine drive as example

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