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To improve the efficiency of wind turbines, permanent magnet synchronous generator has been used instead of doubly-fed induction generator. Permanent magnet synchronous generator has higher efficiency than doubly-fed induction generator because it has no winding loss in the rotor, but it has cogging torque which increases the cut-in speed of wind turbines. Cut-in speed is a kind of major design factor...
This paper presents the optimal design procedure to develop multi-phase external rotor permanent magnet assisted synchronous reluctance machines (EPMa-SynRMs). With its higher torque density and higher power density compared to the internal rotor PMa-SynRM, external rotor PMa-SynRM is best suitable in applications to electric bikes and aircrafts. Enormous amount of research has been done in optimizing...
During the mass production of surface-mounted permanent magnet motors the rotor and stator geometrical dimensions usually deviate from their nominal values due to manufacturing tolerances which impact machine performance. Radial misalignment in the placement of the permanent magnets on the rotor surface as well as slot opening variations are common deviations observables in the final product. As a...
In this paper, cogging torque and unbalanced RMF which occurred in IPM type BLDC motors were investigated regarding as the effect of vibration. The main causes of electromagnetic vibration were the cogging torque and strength of Radial Magnetic Force(RMF). The minimized cogging torque model with notch and the equilibrium RMF model was designed using Design of Experiments(DOE) to reduce vibration....
This paper presents an analytical model for determining air-gap radial and tangential magnetic field in permanent magnet brushless dc (PMBLDC) motor. The solution is based on two-dimensional analysis in polar coordinates for radially magnetized magnet. Effects caused due to non-linear behavior of the stator ferromagnetic yoke are mainly considered. Radial and tangential magnetic field, back emf and...
This paper presents a general method for predicting the cogging torque in surface-mounted permanent magnet machines having different slot sizes and uneven positions by synthesizing the cogging torque associated with each slot, which is obtained by the subdomain model. The developed model is applied to analyse the influence of imperfect slot openings on the cogging torque. It shows that machines having...
The paper compares five analytical models for predicting the cogging torque in surface-mounted permanent magnet machines, viz. lateral force (LF), complex permeance (CP), and combined CP models, together with subdomain (SD) models based on single slot/pole and exact SD model. The models are evaluated for the cogging torque waveforms and the prediction of optimal pole-arc to pole-pitch and slot-opening...
A proposed novel double-barrier design with single-layer IPMSM is well proved to be effective for reducing pulsation torque, torque ripple and cogging torque, in published work, in which the torque characteristics be sensitive to the unique "connected" double-barrier structure is generally studied. This extended paper presents a few specific models for examining the effect of design variables...
This paper presents the design of high performance permanent magnet-assisted synchronous reluctance generators (PMa-SynRG) for the 3 kW tactical quiet generator set. By introducing a proper quantity of permanent magnets into the synchronous reluctance generator rotor core an extended constant power-speed range at high efficiency and high power factor can be achieved. Different stator winding configurations...
This paper presents a reduction method of vibration based on decreased cogging torque for interior type permanent magnet motor. The vibration source which affects biggest in the vibration of the interior type permanent magnet motor is the force, cogging torque, of the radius direction in compliance with a magnetic energy from between stator and the rotor. The notch is established in the rotor because...
The paper presents a comparison between analytical model, the finite elements method (FEM) simulations and measurements for a brushless DC motor used in a solar airplane project. In the preliminary conception phase, an optimization using an analytical model is performed. The motor efficiency and its weight are the key parameters. According to the obtained theoretical optimal configuration, a prototype...
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