Cogging torque reduction methods for internal permanent magnet motors: Review and comparison

Bianchini, Claudio; Immovilli, Fabio; Bellini, A.; Davoli, Matteo

doi:10.1109/icelmach.2010.5607953

Cited by 6 publications

(3 citation statements)

References 16 publications

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“…In ref. [15], based on the principle of cogging cancelation effect of the inner and outer motors, the cogging torque of the DS-PMSM is decreased by changing the relative position between two groups of magnetic poles in inner and outer motors, and adopting different stator slot and rotor pole combinations in the inner and outer motors. Further, the torque ripple is decreased effectively.…”

Section: Introductionmentioning

confidence: 99%

Design of high power density double‐stator permanent magnet synchronous motor

Guo

Wang

et al. 2022

IET Electric Power Appl

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Compared with the traditional permanent magnet synchronous motor (PMSM), the double-stator permanent magnet synchronous motor (DS-PMSM) can utilise the internal space adequately and has high power density. In this study, the design method of this kind of motor will be researched. Different rotor magnetic circuit topologies are analysed while keeping the outer diameter of outer stator unchanged, and the rotor magnetic circuit topologies with higher power density are selected. Furthermore, the effects of pole-arc coefficient and stator split ratio on the power density of the motor are analysed, so a high power density DS-PMSM can be designed. On this basis, a kind of magnetic pole structure with unequal pole-arc coefficient is proposed to solve the problem of large torque ripple in DS-PMSM. Finally, the DS-PMSM is investigated by the FEA, compared with the traditional single stator PMSM, the average torque of the DS-PMSM is increased by 62.2%, and the torque ripple is only 3.2%.

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Section: Introductionmentioning

confidence: 99%

Design of high power density double‐stator permanent magnet synchronous motor

Guo

Wang

et al. 2022

IET Electric Power Appl

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“…Various design related techniques are introduced in order to minimise or eliminate torque pulsations in radial gap PM motors [10][11][12][13][14][15]. Detailed analytical prediction and modelling of the cogging torque in radial gap PM motors [11], comparison of various design related techniques to lower or eliminate the cogging component again in radial gap PM motors [12,13,16] are well covered in the literature. Some of these techniques are skewing the magnets or slots, displacing and shaping the magnets, adding slots or teeth, optimising the magnet pole-arc-to-pole-pitch ratio, employing a fractional number of slots per pole, magnet/pole shifting and rotor displacement.…”

Section: Introductionmentioning

confidence: 99%

“…It is an undesirable component of the torque pulsations which generates problems at low speed control and position control applications. Various design related techniques are introduced in order to minimise or eliminate torque pulsations in radial gap PM motors [10–15]. Detailed analytical prediction and modelling of the cogging torque in radial gap PM motors [11], comparison of various design related techniques to lower or eliminate the cogging component again in radial gap PM motors [12, 13, 16] are well covered in the literature.…”

Section: Introductionmentioning

confidence: 99%

Magnet asymmetry in reduction of cogging torque for integer slot axial flux permanent magnet motors

Güleç

Aydın

2014

IET Electric Power Applications

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Cogging torque component is one of the key issues in the design of radial and axial gap permanent magnet motors and the geometry and the position of the magnets plays a critical role in this process. This study presents the influence of magnet asymmetry in minimisation of the cogging torque for axial flux permanent magnet (AFPM) disc motors. Cogging torque minimisation techniques, such as magnet skewing and magnet shifting or groping are examined in detail by using threedimensional finite element analysis with various types of magnet skewing alternatives since the shaping and the positioning magnets are low cost approaches to minimise or eliminate the cogging component. A prototype AFPM disc motor is built with shifted magnets based on the models which are the results validated with the experimental results for the minimum cogging component and the sinusoidal back-EMF waveform. It is shown in this study that the cogging component in AFPM motors can be practically eliminated by using magnet asymmetry and perfectly sinusoidal back-EMF can also be obtained even for integer slot/pole/phase motors.

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