Cogging Torque Analysis of Magnetic Gear

Niguchi, Noboru; Hirata, Katsuhiro

doi:10.1109/tie.2011.2159357

Cited by 92 publications

(37 citation statements)

References 59 publications

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“…Some work was done on calculating and reducing the cogging torque of transverse flux machines, including the traditional transverse flux machine [4] and flux switching transverse flux machine [5]. Both the analytical method [6,7] and numerical method [8,9] were used to calculate the cogging torque in PMSMs, and various kinds of technologies were developed to reduce the cogging torque in the radial-flux and axial-flux PMSMs [10,11]. These methods can be classified into two ways: one is based on the control method [12], and the other is based on the optimized structure of the PMSM [13].…”

Section: Introductionmentioning

confidence: 99%

Techniques for Reduction of the Cogging Torque in Claw Pole Machines with SMC Cores

Liu

Wang

et al. 2017

Energies

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Abstract:As one of the main parasitic parameters in permanent magnet (PM) synchronous machines (PMSMs), cogging torque is the main component of the torque ripple, which has always been the handicap in the high-performance, low-speed drive systems. Over the last two decades, various methods have been proposed to decrease the cogging torque in both radial-flux and axial-flux PMSMs. Among these methods, stator slot skewing, stator tooth notching, PM skewing, PM shifting, and pole pairing are extensively investigated. However, little work has been done on reducing the cogging torque of the claw pole machine (CPM), whose cogging torque cannot be ignored. In this paper, the general methods that have been used to reduce the cogging torque in radial-flux and axial-flux PMSMs are developed and verified in a CPM with a soft magnetic composite (SMC) core. The 3-D finite element method (FEM) is used to calculate the cogging torque and PM flux linkage per turn. By comparing different cogging torque reduction technologies, it can be found that the magnet step skewing and unequal claw pole width are very suitable for CPM.

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Section: Introductionmentioning

confidence: 99%

Techniques for Reduction of the Cogging Torque in Claw Pole Machines with SMC Cores

Liu

Wang

et al. 2017

Energies

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“…A detailed study on the cogging torque composition was presented in [56]. Cogging torque reduction techniques such as step skew was evaluated in [48].…”

Section: E Cogging and Ripple Torquementioning

confidence: 99%

Magnetic gear technologies: A review

Tlali

Wang

Gerber

2014

2014 International Conference on Electrical Machines (ICEM)

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This paper reviews the historic and current development of magnetic gear technologies. There has been considerable amount of research and development activities on magnetic gear technologies in recent years. However, it is still not clear if this technology is ready for potential industry applications. The purpose of this paper is to summarize the historic and current development work of magnetic gear technologies in an attempt to give readers some insight into the advantages and disadvantages, challenges, opportunities and technology readiness.

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“…The operating principle of the MFM-BDRM is deduced based on interaction of magnetic fields. To describe torque ripple characteristics, the cogging toque is mathematically formulated [29][30][31]. Matching principle of the number of pole pairs of the stator, that of the permanent magnet rotor, and the number of ferromagnetic pole pieces is discussed [32][33][34][35].…”

Section: Icementioning

confidence: 99%

“…When there is no current flow i in the stator coil, the cogging torque can be calculated from differentiating the total magnetic energy W with respect to the relative position angle α by Equation (31):…”

Section: Cogging Torquementioning

confidence: 99%

Research on an Axial Magnetic-Field-Modulated Brushless Double Rotor Machine

et al. 2013

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Double rotor machine, an electronic continuously variable transmission, has great potential in application of hybrid electric vehicles (HEVs), wind power and marine propulsion. In this paper, an axial magnetic-field-modulated brushless double rotor machine (MFM-BDRM), which can realize the speed decoupling between the shaft of the modulating ring rotor and that of the permanent magnet rotor is proposed. Without brushes and slip rings, the axial MFM-BDRM offers significant advantages such as excellent reliability and high efficiency. Since the number of pole pairs of the stator is not equal to that of the permanent magnet rotor, which differs from the traditional permanent magnet synchronous machine, the operating principle of the MFM-BDRM is deduced. The relations of corresponding speed and toque transmission are analytically discussed. The cogging toque characteristics, especially the order of the cogging torque are mathematically formulated. Matching principle of the number of pole pairs of the stator, that of the permanent magnet rotor and the number of ferromagnetic pole pieces is inferred since it affects MFM-BDRM's performance greatly, especially in the respect of the cogging torque and electromagnetic torque ripple. The above analyses are assessed with the three-dimensional (3D) finite-element method (FEM).

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Cogging Torque Analysis of Magnetic Gear

Cited by 92 publications

References 59 publications

Techniques for Reduction of the Cogging Torque in Claw Pole Machines with SMC Cores

Techniques for Reduction of the Cogging Torque in Claw Pole Machines with SMC Cores

Magnetic gear technologies: A review

Research on an Axial Magnetic-Field-Modulated Brushless Double Rotor Machine

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