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Cogging torque reduction methods
2014 Electric Power Quality and Supply Reliability Conference (PQ), 2014This paper considers the study of methods for reduction of the cogging torque in permanent magnet machines. Cogging torque has been analyzed to be reduced by slot skewing, width of slot opening, magnet pole radius and also by mounting of the magnets.
Oleg Kudrjavtsev, Aleksander Kilk
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Cogging Torque Characteristics of a Magnetic-Geared Motor
IEEJ Transactions on Industry Applications, 2012Purpose The purpose of this paper is to propose a magnetic-geared motor with permanent magnets only on the high-speed rotor as a solution to the problems of magnetic gears. Magnetic gears have some advantages such as no mechanical loss and maintenance-free operation that are not observed in conventional mechanical ...
Noboru Niguchi, Katsuhiro Hirata
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Cogging Torque Analysis of Magnetic Gear
IEEE Transactions on Industrial Electronics, 2012This paper describes the harmonic spectra of the cogging torque of a magnetic gear. The operating principle of this gear is described, and the transmission torque under operation in accordance with the gear ratio is mathematically formulated. In particular, the harmonic order of the cogging torque is described in detail.
Noboru Niguchi, Katsuhiro Hirata
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Cogging Torque Calculation with Field Smoothing
INTERMAG 2006 - IEEE International Magnetics Conference, 2006The Maxwell stress tensor is one of the most widely used method that can get the force or torque values of electromagnetic devices. This method is very simple and easy to apply in both global and local force calculation. But, trying to use the Maxwell stress tensor method, we have to pay attention to the integration path and the discontinuity of ...
S. Won, J. Lee
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Cogging torque estimation for sensorless PMSM
2012 XXth International Conference on Electrical Machines, 2012A major issue for mass produced permanent magnet synchronous motors (PMSM) is the minimization of acoustic noise. A significant source of this noise is cogging torque. Design related cogging torque that does not vary between motors can be compensated by a predetermined control scheme.
Ben Saunders +3 more
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Cogging Torque Reduction by Elementary-Cogging-Unit Shift for Permanent Magnet Machines
IEEE Transactions on Magnetics, 2017This paper describes a method to reduce cogging torque in permanent magnet (PM) machines by shifting elementary-cogging unit (ECU). The ECU division principle and the feature of cogging torque produced by ECU are also discussed. The proper shift angles for each ECU are deduced according to both fractional and integral slot number per pole, by which any
Jian Gao +5 more
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Magnetic gear: Radial force, cogging torque, skewing and optimization
2015 IEEE Energy Conversion Congress and Exposition (ECCE), 2015Magnetic gears are able to transmit torque between an input and an output shaft without mechanical contact. As for electrical drives, torque density, acoustic noise, and torque ripple are of primary concern. This paper describes the influence of the pole numbers on the radial forces and the cogging torques.
Gerald Jungmayr +4 more
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Cogging torque and torque ripple reduction of modular permanent magnet machines
2016 XXII International Conference on Electrical Machines (ICEM), 2016In order to minimize the cogging torque and torque ripple for surface mounted permanent magnet (SPM) machines, this paper proposes a C-core modular stator which can be obtained by inserting flux gaps (FGs) into every stator tooth. The electromagnetic performances of C-core modular PM machines such as open-circuit flux linkage, phase back-EMF, cogging ...
G. J. Li, B. Ren, Z. Q. Zhu
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New Approach to Cogging Torque Simulation Using Numerical Functions
IEEE Transactions on Industry Applications, 2011The paper presents a new method for simulation of the cogging torque in a PM machine. The method benefits the numerical functions for modeling the magnetic system of the electrical machine. To compute the cogging torque by the numerical functions, it is necessary to model the permanent magnets and permeance of the machine.
SAIED, SEYEDAMIN +3 more
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2005 European Conference on Power Electronics and Applications, 2005
In this paper the cogging torque of an existing permanent magnet DC motor must be increased. Thus motors are frequently used in motor vehicles. In order to hold a position the motor must be under current, because in most cases the cogging torque is too small to keep the motor in position.
J. Bacher, G. Maier
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In this paper the cogging torque of an existing permanent magnet DC motor must be increased. Thus motors are frequently used in motor vehicles. In order to hold a position the motor must be under current, because in most cases the cogging torque is too small to keep the motor in position.
J. Bacher, G. Maier
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