Design Technique for Reducing the Cogging Torque in Large Surface-Mounted Magnet Motors

Lateb, Ramdane; Takorabet, Noureddine; Meibody‐Tabar, Farid; Enon, J.; Sarribouette, A.

doi:10.1007/978-1-4020-4535-6_6

Cited by 9 publications

(4 citation statements)

References 10 publications

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“…Cogging torque components torque amplitude decreases with increasing cogging frequencies. A variety of methods are known to minimize NHC in PM motors (Bianchi and Bolognani, 2002;Lateb et al, 2004Lateb et al, , 2006Islam et al, 2004;Bretón et al, 2000). Theoretically, it is even possible to eliminate NHC, but in practice they can only be substantially minimized applying proper design methods.…”

Section: Cogging Torque Harmonic Components (Hc)mentioning

confidence: 99%

“…Minimization of cogging torque often becomes a challenging task, since it is composed of numerous harmonic components (HC), which originate in combination of many design parameters and material or assembly imperfections (Islam et al, 2004;Gašparin et al, 2009b;Miljavec and Zidarič, 2007). Besides applying appropriate combination of stator and rotor design techniques (Dosiek and Pillay, 2007;Lateb et al, 2004;Islam et al, 2004;Hanselman, 2003;Zhu et al, 2006), the other option for cogging torque reduction is to introduce advanced control methods of the drive (Nemec et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Additional cogging torque components due to asymmetry in stator back iron of PM synchronous motors

Gašparin

Černigoj

Fišer

2011

COMPEL

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Purpose -The purpose of this paper is to present the dependence of the level and harmonic structure of the cogging torque in permanent magnet synchronous motors (PMSM) to interlocks and notches in a stator back iron, which are standard methods for stator lamination stacking in mass-production. Design/methodology/approach -Methods of stacking up the lamination like welding or interlocking are introducing magnetic asymmetries in stator back iron which causes additional harmonic components (AHC). A finite element method and Fast Fourier transform were used to calculate cogging torque harmonic components (HC) with regard to the applied number and positions of interlocks and notches. All simulation results were verified by laboratory tests. Findings -It has been established and proved that technologies for stacking lamination packs cause local saturation peaks in back iron which give rise to additional cogging torque AHC and consequently increase the total cogging torque. It is also shown that the magnetic properties of interlocks cannot be simply considered as air regions but adequate relative permeability of such affected soft magnetic material must be determined to improve the accuracy of FEM calculations. Practical implications -Considering presented results, it is possible to foresee which AHC will include the cogging torque of mass-produced PMSMs due to the stator lamination stacking methods. In this way, the optimal stacking method can be selected in order to minimize the effect of AHC. Originality/value -So far, authors dealing with the cogging torque have not taken into account the influence of the stator lamination stacking method on the level of torque oscillations.

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Section: Cogging Torque Harmonic Components (Hc)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Additional cogging torque components due to asymmetry in stator back iron of PM synchronous motors

Gašparin

Černigoj

Fišer

2011

COMPEL

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“…It has been shown in previous papers [6] that the use of magnetic wedges in the stator slots with a weak relative permeability ( 10 ≈ r µ ) allows reducing the cogging torque. On the other hand, the skew of the stator slots with an angle corresponding to one slot pitch allows the cancellation of the first harmonic of the cogging torque.…”

Section: Cogging Torque Reductionmentioning

confidence: 96%

Study of Different Architectures of Fault Tolerant Actuator Using a Double-Star PM Motor

Takorabet

Caron

Vaseghi

et al. 2008

2008 IEEE Industry Applications Society Annual Meeting

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In the context of more electric aircrafts, the use of electric actuators instead of hydraulic ones is one of the main topics of research and development in electrical engineering. A high level of reliability, the redundancy and the compactness are required for aircraft electrical actuators. For achieving these purposes the classical solution consists in using two identical actuators motorized each by one PM motor supplied by a VSI. In this paper a solution based on the use of only one fault tolerant actuator performed by a two star connected windings (doublestar) PM motor supplied by two PWM-VSI is proposed. The design of the PM motor can be achieved in two different ways that are proposed and studied in this paper. The authors focus this paper on the comparison between the two winding architectures and compare the two motors in terms of shortcircuit current and magnetic decoupling of the two windings. Both simulation and experimental results are given and discussed.

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“…Minimization of cogging torque frequently becomes a challenging task, since it is composed of numerous harmonic components, which originate in combination of many design parameters and material or assembly imperfections [5][6][7]. Besides applying appropriate combination of stator and rotor design techniques [5,[8][9][10][17][18][19], the other option for cogging torque reduction is to introduce advanced control methods of the drive [11]. Regularly observed substantial differences between calculated (simulated) and measured cogging torque values was a cogent motive for the presented research of cogging torque sensitivity to manufacturing imperfections and tolerances, which are unavoidable facts in mass-production.…”

Section: Introductionmentioning

confidence: 99%

Cogging torque sensitivity to permanent magnet tolerance combinations

Gašparin¹,

Fišer²

2013

Archives of Electrical Engineering

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This study presents the dependence of the level and harmonic structure of the cogging torque in permanent magnet synchronous motors (PMSM) to imperfections of permanent magnet (PM) dimensions and positions, which can not be avoided in massproduction. Slightly diverse dimensions and misplacements of PMs are introducing asymmetries in magnetic field distribution which cause additional harmonic components. A finite element method (FEM) and Fast Fourier transform (FFT) were used to calculate cogging torque harmonic components with regard to several combinations of PM assembly imperfections. It has been established and proved that unequal PMs cause magnetic asymmetries which give rise to additional cogging torque harmonic components and consequently increase the total cogging torque. It is also shown that in some particular combinations the influence of an individual PM imprecision could compensate with others due to different phase shifts which can result even in the decrease of cogging torque. Considering presented results it is possible to foresee which additional harmonic components will comprise the cogging torque of mass-produced PMSMs due to PM imperfections. In this way the designers are able to predetermine required manufacturing tolerances to keep the level of cogging torque in a admissible level. Simulation results were verified and confirmed by laboratory tests.

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Design Technique for Reducing the Cogging Torque in Large Surface-Mounted Magnet Motors

Cited by 9 publications

References 10 publications

Additional cogging torque components due to asymmetry in stator back iron of PM synchronous motors

Additional cogging torque components due to asymmetry in stator back iron of PM synchronous motors

Study of Different Architectures of Fault Tolerant Actuator Using a Double-Star PM Motor

Cogging torque sensitivity to permanent magnet tolerance combinations

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