Experimental Results Regarding Cogging Torque Reduction for the Permanent Magnet Synchronous Motors PMSM

Popescu, Mihail; Tudor, Emil; Nicolaie, Sergiu; Ilie, Cristinel; Popovici, Liviu; Dumitru, Constantin

doi:10.1109/atee.2019.8725014

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…Thus, it is essential to select a slot/pole combination having high winding factor [18]. The other factor is cogging torque which is produced by the interaction between the PM poles with the stator [1]. Cogging torque is symmetrically fluctuated and number of cogging cycles per one revolution (Nct) is equal to the least common multiple (LCM) of slots number and poles number and it is equal to (2) [19]:…”

Section: Design Specificationsmentioning

confidence: 99%

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In-wheel, outer rotor, permanent magnet synchronous motor design with improved torque density for electric vehicle applications

Bdewi

Ali

Mohammed

2022

IJECE

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In electric vehicle applications, the torque density of electric motor plays an important role in improving the performance of the vehicle. The main objective of this paper is to investigate a possible method for improving the torque density of a permanent magnet synchronous motor used in electric vehicles. At the same time, other machine specifications were taken into account and kept within the acceptable level. This was achieved by incorporating performance enhancement strategies such as investigating ofhigh-efficient winding topology for the motor’s stator to give the highest winding factor and optimizing the machine dimensions to achieve the best performance. MagNet 7.4.1 software package with static and transient finite element method solver was used for implementing the proposed design. The results showed a significant improvement in the torque density with keeping the overall machine performance.

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Section: Design Specificationsmentioning

confidence: 99%

“…By using the PMs, the DC supply for excitation is no longer required. Moreover, eliminating copper from the rotor allows the motor design with smaller rotor diameters resulting in lower rotor inertia [1]- [6]. Two techniques may be used in EV drives to achieve high efficiency and power density.…”

Section: Introductionmentioning

confidence: 99%

In-wheel, outer rotor, permanent magnet synchronous motor design with improved torque density for electric vehicle applications

Bdewi

Ali

Mohammed

2022

IJECE

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“…This section discusses the validity of the assumption of constant speed in (7) and (8), the accuracy of the torque measurement, and the run-out accuracy of the test setup.…”

Section: Speed Constancy Torque Accuracy and Run-out Accuracymentioning

confidence: 99%

Rheometer-Based Cogging and Hysteresis Torque and Iron Loss Determination of Sub-Fractional Horsepower Motors

Leitner

Krenn

Gruebler

et al. 2020

IEEE Trans. on Ind. Applicat.

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Accurately measuring the cogging torque, hysteresis torque, and iron losses of permanent magnet (PM) motors is a challenging task. This is especially true for sub-fractional horsepower (SFHP) variants used, e.g., in auxiliary drives for automotive fan and pump applications. Their cogging torque and hysteresis torque peak values are often in the sub-milli-Newton meter range, causing conventional measuring methods and devices to fail as especially friction impedes the measurement significantly. Moreover, their iron losses are hard to determine and usually merely estimated in the literature. This article presents an unconventional rheometer-based method to determine both 1) the cogging torque and hysteresis torque of SFHP PM motors and 2) their iron losses by evaluating the observed offset torque. Two SFHP outer-rotor PM motor topologies for fan applications are analyzed, i.e., a claw-pole motor and a salient-pole motor. The results show that, with the proposed setup, settings, and evaluation, a rheometer can successfully be used to determine the cogging torque and hysteresis torque waveforms in the sub-milli-Newton meter range and the iron losses of SFHP motors, both with excellent accuracy.

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“…[16][17][18][19][20] In the machine-based studies, on the other hand, optimizations on stator, rotor, magnet geometry or material type are performed. In Popescu et al, 21 the change in the cogging torque in relation to magnet radius change, combinations of pole/rotor slot numbers and skew amount of the rotor was examined. However, in the study, the effect of the variables on the performance of the machine was ignored, and only the cogging torque was considered.…”

Section: Introductionmentioning

confidence: 99%

Cogging torque analysis in permanent magnet synchronous generators using finite elements analysis

Dalcalı

2020

Int Trans Electr Energ Syst

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Background: A number of generator types are used as energy converters in wind turbines. Despite the advantages of PMSG such as high-power density, high efficiency and low speed, the effect of the cogging torque occurring in PMSG must be reduced. Aim: The aim of this study is cogging torque optimization of internal rotor, surface mounted, PMSGs used in wind turbines with high number of slots and poles (84/14). Materials and methods: The performance and cogging torque characteristic of the generator have been studied by the finite element analysis (FEA) method. Results: While the cogging torque value of the initial generator 580 mNm, with changing skew it is optimized to 277.04 mNm, with changing pole arc offset it is tuned to 550 mNm. With a notch on the magnet and teeth it is minimized to 417.25 mNm and 383.9 mNm, respectively. Finally, increasing the ratio of slot opening to slot pitch, undermine the value of cogging torque. Conclusions: The obtained results illustrate that any improvement in cogging torque characteristic using the applied methods accordingly compromises other merits such as flux density, output power, labor and cost.

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Experimental Results Regarding Cogging Torque Reduction for the Permanent Magnet Synchronous Motors PMSM

Cited by 6 publications

References 3 publications

In-wheel, outer rotor, permanent magnet synchronous motor design with improved torque density for electric vehicle applications

In-wheel, outer rotor, permanent magnet synchronous motor design with improved torque density for electric vehicle applications

Rheometer-Based Cogging and Hysteresis Torque and Iron Loss Determination of Sub-Fractional Horsepower Motors

Cogging torque analysis in permanent magnet synchronous generators using finite elements analysis

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