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In this paper, two novel bearingless switched reluctance motors (BLSRMs), 8/10 hybrid type and 12/14 hybrid type, are presented. The two BLSRMs have separate torque and suspending force poles. Due to the independent characteristics between the torque and suspending force, the torque control can be decoupled from the suspending force control. In this paper, suspending force control characteristics...
This paper describes mathematical modeling of a novel wound-field synchronous motor self-excited by space harmonics. The torque equation on the dq-reference frame is investigated to clarify the self-excitation mechanism of the proposed motor. It has been analytically explicated how the motor parameters give influences on the self-excited electromagnet torque. Furthermore, the current phase vs. torque...
This paper presents a novel control strategy to stably support the rotor shaft when a bearingless motor (BELM) based on d-q axis current control is driven under loaded condition. In this type BELM, the magnitude and direction of the suspension force are unfortunately varied depending on the rotor rotation, which causes the unstable rotor levitation during the motor operation. Thus, the compensation...
For the sustainable development of our highly electrified societies, power electronics technology is playing an important role. Especially in the field of electric power systems, it is considered as one of the essential technologies which make power grids more efficient, more reliable and more environment-friendly. Those are the goals of so-called smart grids. In this paper, expected roles and applications...
In this paper, design and analysis of interior permanent magnet synchronous motor for electric vehicle bus propulsion is performed based on Finite Element Method. As the increase of the advanced application which requires precise control, the inverter is regarded as requisite for controlling electric machines. In addition multi-domain co-simulation is important to consider the inter-linking effect...
This paper describes an approach to the optimal design of high efficiency permanent magnet reluctance motors (PRM) based on the Taguchi method coupled with finite element analysis (FEA) because of the requirements of the impending IE4 Super Premium Efficiency classification. The objectives of the optimal design are to increase the efficiency and to decrease an amount of the permanent magnet of the...
The paper proposes the half-wave rectified brushless synchronous generator and analyzes the basic characteristics using the finite element method. It is based on the half-wave rectified excitation theory and doesn't need brush and slip ring system or permanent magnets for field excitation.
Calculating leakage reactance of transformers is a very important factor in designing transformers. In the traditional two-winding transformer, the calculation methods of leakage reactance have been presented using the inductance deduced by the geometry mean length between two windings. However, it is difficult to calculate the leakage reactance in multi-winding transformers, because its structure...
In this paper, it was proposed to the optimization of skew of SPMSM with 3-dimensional finite element method (3D-FEM). The optimization technique was used multi-step parallel Genetic Algorithm (GA) and the allocation of material assignment method. As a result, in useful computation time, It was able to obtain an optimal skew special shape. And, it was able to reduce the cogging torque of more than...
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