Effect of magnet segmentation on the cogging torque in surface-mounted permanent-magnet motors

Lateb, Ramdane; Takorabet, Noureddine; Meibody‐Tabar, Farid

doi:10.1109/tmag.2005.862756

Cited by 168 publications

(80 citation statements)

References 8 publications

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“…The particular openings between the blocks determine the space harmonic content of the magnetomotive force generated by the pole. For a three-phase machine, the design approach is often used to reduce the cogging torque [8], [9]. For example, to choose a magnet arc to pole pitch ratio equal to 2/3 eliminates the first cogging torque harmonic in case of integral-slot winding distribution.…”

Section: B Particular Pole Design Reviewmentioning

confidence: 99%

Magnet Shape Optimization to Reduce Pulsating Torque for a Five-Phase Permanent-Magnet Low-Speed Machine

Scuiller

2014

IEEE Trans. Magn.

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract-Five-phase Surface-Mounted Permanent Magnet (SMPM) machines can inherently produce a smooth electromagnetic torque which can be increased when using third harmonic current injection. To really take advantage of these characteristics, the rotor magnets can be shaped in order to obtain a back-emf with large third harmonic term. This is the scope of the paper. For the design specifications of a low speed marine propulsion machine, the following objective must be achieved: to significantly mitigate the pulsating torque without reducing the average torque bearing in mind the solution where the rotor is made with full pole-pitch magnets. An analytical field computation, called equivalent coil method, is developed in order to quicly explore the magnet geometries. Thus a procedure to optimize small trapezoid notches at the surface of the pole magnets is performed. Referring to the classical fully pole-pitch magnet shape, the solution found allows a substantial reduction of the pulsating torque without reducing the torque density. Furthermore, with regard to an equivalent three-phase machine, for the same copper losses, the average torque of the optimized five-phase machine can be potentially higher if the third harmonic current injection is implemented.

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Section: B Particular Pole Design Reviewmentioning

confidence: 99%

Magnet Shape Optimization to Reduce Pulsating Torque for a Five-Phase Permanent-Magnet Low-Speed Machine

Scuiller

2014

IEEE Trans. Magn.

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“…Researchers have investigated different methods for reducing the cogging torque. Slot skewing [4] and [8], magnet skewing [9], auxiliary slots or teeth [10] and [11], pole-arc optimization [12] to [15], slot or tooth paring [16], magnet segmentation [17] and [18], magnet shifting and shaping [9,13] to [15,19] and [21] are examples of the solutions have been proposed in the literature for reducing cogging torque. Although these techniques are successful in reducing the undesired cogging torque, but they can also reduce the desired mutual torques.…”

Section: Introductionmentioning

confidence: 99%

Cogging Torque Reduction in Line Start Permanent Magnet Synchronous Motor

Behbahanifard¹,

Sadoughi²

2016

Journal of Electrical Engineering and Technology

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-Cogging torque has a negative impact on the operation of permanent magnet machines by increasing torque ripple, speed ripple, acoustic noise and vibration. In this paper Magnet Shifting Method has been used as a tool to reduce the cogging torque in inset Line Start Permanent Magnet Synchronous Motor (LSPMSM). It has been shown that Magnet Shifting Method can effectively eliminate several lower-order harmonics of cogging torque. In order to implement the method, first the expression of cogging torque is studied based on the Fourier analysis. An analytical expression is then introduced based on Permanent Magnet Shifting to reduce cogging torque of LSPMS motors. The method is applied to some existing machine designs and their performances are obtained using Finite Element Analysis (FEA). The effect of magnet shifting on pole mmf (magneto motive force) distribution in air gap is discussed. The side effects of magnet shifting on back-EMF, core losses and torque profile distortion are taken into account in this investigation. Finally the experimental results on two prototypes 24 slot 4 pole inset LSPMS motors have been used to validate the theoretical analysis.

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“…The cage rotor fixed to the shaft revolves slower than the synchronized speed of the rotating magnetic field by the stator current. The magnets rotor, however, revolves at synchronized speed [18][19][20]. …”

Section: Introductionmentioning

confidence: 99%

Study on Dual-Rotor Permanent Magnet Induction Motor and Performance

Diao¹

2015

TOEEJ

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Abstract:In this paper, dual-rotor permanent magnet induction motor(DRPMIM) is studied to improve performance of usual induction motor(IM). Two-dimensional finite element model for DRPMIM is established by Maxwell Ansoft software, and electromagnetic characters of that was analyzed.Based on the rotating coordinate system, the mathematical model concerning DRPMIM, performance curves under the different load are obtained. The final simulation analysis results are in good agreement with the theoretical predicting results, which can be used to afford a theoretical basis to design the DRPMIM in the future. Compared with the conventional asynchronous motor, the DRPMIM can effectively improve power factor and efficiency.

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Effect of magnet segmentation on the cogging torque in surface-mounted permanent-magnet motors

Cited by 168 publications

References 8 publications

Magnet Shape Optimization to Reduce Pulsating Torque for a Five-Phase Permanent-Magnet Low-Speed Machine

Magnet Shape Optimization to Reduce Pulsating Torque for a Five-Phase Permanent-Magnet Low-Speed Machine

Cogging Torque Reduction in Line Start Permanent Magnet Synchronous Motor

Study on Dual-Rotor Permanent Magnet Induction Motor and Performance

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