Torque production in permanent-magnet synchronous motors

Ree, Jaime De La; Boules, Nady

doi:10.1109/28.18879

Cited by 115 publications

(32 citation statements)

References 2 publications

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“…1(a), such that the harmonics term of the air-gap permeance Fourier coefficient changes and the harmonics term increases due to the influence of the notch. In addition, the frequency of harmonics increases and the size decreases, which eventually reduces the cogging torque [9]. If the permeance function of the air-gap assumes that the part that applied the notch qual to 0, it can gain the shape shown in Fig.…”

Section: Analytical Expression For Cogging Torquementioning

confidence: 99%

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A Novel Cogging Torque Reduction Method for Single-Phase Brushless DC Motor

Park¹,

Cho²,

Rhyu³

et al. 2013

Journal of Magnetics

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Single-phase, brushless DC (BLDC) motors have unequal air-gaps to eliminate the dead-point where the developed torque is zero. Unfortunately, these unequal air-gaps can deteriorate the motor characteristics in the cogging torque. This paper proposes a novel design for a single-phase BLDC motor with an asymmetric notch to solve this problem. In the design method, the asymmetric notches were placed on the stator pole face, which affects the change in permanent magnet shape or the residual flux density of the permanent magnet. Parametric analysis was performed to determine the optimal size and position of the asymmetric notch to reduce the cogging torque. Finite element analysis (FEA) was used to calculate the cogging torque. A more than 28% lower cogging torque compared to the initial model with no notch was achieved.

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Section: Analytical Expression For Cogging Torquementioning

confidence: 99%

“…Some approaches have proposed the analytical model capable of predicting the cogging torque [9][10][11] and changing the design parameter such as teeth notching [12,13] for symmetric air-gap. The analytical methods are effective to find the parameters quickly for reducing cogging torque.…”

Section: Introductionmentioning

confidence: 99%

A Novel Cogging Torque Reduction Method for Single-Phase Brushless DC Motor

Park¹,

Cho²,

Rhyu³

et al. 2013

Journal of Magnetics

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“…The difference is in the value of the skew angle used. We developed a simple formula for best skew angle which is different to that used by the majority of designers [1,3,5,7]. This formula results from the analysis of the distribution of the magnetic field harmonics in the motor air-gap, like the other methods, but it gives best angle of skew for the particular motor, and not the minimum one like the other approaches.…”

Section: Introductionmentioning

confidence: 99%

“…Although much has been done in this area to date, newer publications show that it is still of significant concern to the designers of permanent magnet machines [7][8][9][10][11]. Among many approaches developed to cope with this problem, the skew of the stator stack sheet pack is the most natural and perhaps, the simplest method of preventing the machine from generating the reluctance-type torques to apply at the design stage [1,3,[7][8][9][10][11]. In permanent magnet machines, the major task of skew is to get rid of the cogging torque.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on a choice of stator slot skew angle in brushless PM machines

2012

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The paper investigates the effects of stator slot skewing in a permanent magnet brushless DC motor. A simple analytic formula for calculation of the best angle of stack skew, which leads to nearly total reduction of the cogging torque, is developed. The skew angle obtained from this formula is different to that used by the designers of PM brushless motors. The analysis is carried out for a fractional horsepower brushless permanent magnet motor with the surface-mounted magnets using a time-stepping, multi mesh-slice finite element model, to assess the impact of this change. The steady-state characteristics and core losses are analyzed quantitatively using the elaborated numerical model. It is shown that smaller skew angles obtained from the formula lead to noticeable rise in motor overall efficiency and decrease of the core loss. The possibility of accomplishment of the desired effect of skew in a real machine is also a subject of discussion.

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On the analysis and reduction of the cogging torque of a claw pole transverse flux permanent magnet machine

Masmoudi

Njeh

El-Antably

2005

Int Trans Elec Energy Syst

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SUMMARYThe transverse flux permanent magnet machine (TFPM) is currently given an increasing attention, especially in electric and hybrid propulsion applications. Although significant improvements have been carried out on the earlier topologies, much work is still required before the TFPM can be regarded as a mature concept. Of particular interest is the cogging torque reduction which is a vital requirement in propulsion applications, as far as passenger comfort is concerned. The present paper deals with, in a first step, a three-dimensional (3D) finite element analysis (FEA)-based investigation of the cogging torque of a claw pole TFPM. Then, an approach to the cogging torque reduction based on skewing is proposed. This is done considering a single-phase TFPM concept. Then, the study is extended to the three-phase claw pole TFPM, considering different combinations of the axially-arranged phases.

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Torque production in permanent-magnet synchronous motors

Abstract: The investigation involves detailed analysis of the torque production in a permanent-magnet synchronous motor drive with rectangular current excitation. The analysis includes the prediction of cogging as well as commutation torques. The effect of skewing is considered in the study.

Cited by 115 publications

References 2 publications

A Novel Cogging Torque Reduction Method for Single-Phase Brushless DC Motor

A Novel Cogging Torque Reduction Method for Single-Phase Brushless DC Motor

Investigation on a choice of stator slot skew angle in brushless PM machines

On the analysis and reduction of the cogging torque of a claw pole transverse flux permanent magnet machine

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