Permanent Magnet Synchronous Motor Magnet Designs with Skewing for Torque Ripple and Cogging Torque Reduction

Islam,; Husain,; Fardoun,; McLaughlin,

doi:10.1109/07ias.2007.240

Cited by 46 publications

(39 citation statements)

References 9 publications

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“…The magnitude of the air gap magnetic flux density directly affects the torque level whereas its harmonic content is responsible torque ripples as discussed in [26]. Fig.…”

Section: Test Resultsmentioning

confidence: 98%

Torque Ripple Reduction in an Axial Flux High Temperature Superconducting Motor

González-Parada

Trillaud

Guzmán-Cabrera

et al. 2015

IEEE Trans. Appl. Supercond.

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The design, construction, and operation of superconducting rotatory machines in an axial flux configuration are strongly dependent on the ability to reduce torque ripple. A new concept is presented in order to maximize the output power optimizing the magnetic flux density within the air gap of a threephase fully superconducting induction motor. The machine is designed on a basis of bilateral stators distributed around a central rotor. The optimal distribution of magnetic flux and the minimization of torque ripple are resulting from an adequate distribution of motor phases, number of rotor bars, and choice of air-gap thickness. The magnitude of magnetic flux in the air gap is obtained by means of finite-element analysis, and some derived parameters are compared to experimental results. Then, the impact of the design on torque magnitude and torque ripple is discussed.Index Terms-Air gap magnetic flux density, axial flux machine, HTS motors, torque ripple.

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“…The magnitude of the air gap magnetic flux density directly affects the torque level whereas its harmonic content is responsible torque ripples as discussed in [26]. Fig.…”

Section: Test Resultsmentioning

confidence: 98%

Torque Ripple Reduction in an Axial Flux High Temperature Superconducting Motor

González-Parada

Trillaud

Guzmán-Cabrera

et al. 2015

IEEE Trans. Appl. Supercond.

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show abstract

“…Minimizing cogging torque is a very important issue in design of electric machines. Many different methods have been introduced to reduce cogging torque such as using fractional number of slots per pole, optimization of magnet pole arcs, introducing auxiliary slots or teeth, skewing of stator slots and permanent magnets, magnet shaping and displacing, and using a two-segment rotor with a twisted angle between the two axial segments (Zhu et al, 2009;Guemes et al, 2010;Hwang et al, 1998;Yang et al, 2006;Lukaniszyn et al, 2004a,b;Islam et al, 2009;Fei and Luk, 2010;Chen et al, 2010). Among all of these methods stator slot and magnet skewing techniques are the most widely used.…”

Section: Introductionmentioning

confidence: 98%

Improved technique for minimizing torque pulsation in Halbach array permanent magnet machines

Sadeghi

Parsa²

2012

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose -The purpose of this paper is to minimize the torque pulsation in Halbach array permanent magnet synchronous machines (PMSMs). Design/methodology/approach -Because of its specific structure, the cogging torque influences the main part of the torque pulsation in a Halbach array PMSM. In this paper, first it is shown that the conventional magnet skewing method does not have a significant effect on the torque pulsation in this motor, and then an improved skewing method with fewer skewing steps is proposed. In this method permanent magnet segments are placed sinusoidally, with two-step skewing along the rotor. Generalization with different combinations of slots and poles is considered for a Halbach array PMSM. Findings -Using a detailed finite element method (FEM) it was found that with the proposed technique the cogging torque factor is reduced to as low as 8 percent, while the average value of the torque is maintained near the machine nominal average torque. Practical implications -Halbach array PMSMs are very good candidates for high dynamic performance applications such as aerospace applications due to their high acceleration and deceleration features. This technique also resolves the mechanical vibration and acoustic noise issues, which are caused by torque pulsation and significantly affect machine performance. Originality/value -The originality of this paper lies in the FEM results. Since Halbach array PMSMs have a special structure it was shown that the conventional skewing method does not work well for this machine. The new proposed technique has a significant effect on the torque pulsation.

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“…Two major sources that give rise to the torque pulsation and stator torsional vibration in a PM BLAC machine are the non-sinusoidal back-EMF and cogging torque [1]. While various design techniques such as rotor and/or stator skewing [2] are relatively effective in minimizing the back-EMF harmonics and cogging torque, however, they tend to reduce the average output torque and increase the manufacturing cost. In addition, back-EMF harmonics and residual cogging torque always exist in practical drives even skewing is employed owing to inevitable machine design trade-offs and manufacturing tolerances [3][4] [5].…”

Section: Introductionmentioning

confidence: 99%

Control of stator torsional vibration in PM brushless AC drives due to non-sinusoidal back-EMF and cogging torque by improved direct torque control

Zhu

Leong

Liu

2011

2011 International Conference on Electrical Machines and Systems

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This paper presents a comparative study of the stator frame torsional vibration induced in indirect-and direct-torque controlled permanent magnet brushless AC drives with nonsinusoidal back-EMF waveforms. An improved direct torque controller, which accounts for the influences of non-ideal back-EMF and cogging torque, is proposed. Its effectiveness in minimizing low order stator frame torsional vibration is validated and confirmed experimentally.Index Terms-brushless AC machine, direct torque control, permanent magnet, torsional vibration.

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Permanent Magnet Synchronous Motor Magnet Designs with Skewing for Torque Ripple and Cogging Torque Reduction

Cited by 46 publications

References 9 publications

Torque Ripple Reduction in an Axial Flux High Temperature Superconducting Motor

Torque Ripple Reduction in an Axial Flux High Temperature Superconducting Motor

Improved technique for minimizing torque pulsation in Halbach array permanent magnet machines

Control of stator torsional vibration in PM brushless AC drives due to non-sinusoidal back-EMF and cogging torque by improved direct torque control

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