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This paper proposes a simple technique to get maximum power of wind energy conversion system (WECS) without using sensors for wind and rotor speed of the permanent magnet synchronous generator (PMSG). It uses the measurements of DC current and DC voltage to obtain maximum power point tracking (MPPT) by controlling the duty cycle of the DC-DC boost converter switch. Moreover, a PI control is employed...
The paper deals with the design and testing of a surface-mounting permanent magnet (PM) generator with an outer rotor for variable speed applications. The purpose of this work has been to build a PM generator with simple structure, good performances and relatively low costs. The paper presents the main design specifications and the performance characteristics of a 3 kW, 250 rpm and some test results...
This paper presents the magnetic suspension test results of a bearingless motor/generator for flywheel energy storage systems. A prototype bearingless motor/generator is built on the basis of the computed results by Finite Element Method (FEM). It is an outer rotor-type permanent magnet (PM) synchronous motor/generator and the rotor is wrapped by the flywheel (CFRP). Thus, the motor/generator, the...
During recent years the market for small wind turbine generators (SWTG) has been continuously growing. In this context, the supply of components for this product has also been increasing. The main components of SWTG are the rotor, the generator and the wind energy conversion system (WECS), typically formed by a rectifier plus an inverter. The settings of WECS affect the SWTG behaviour, especially...
This paper presents a novel speed & position estimation algorithm for the PMSG based wind turbine using Adaptive Network-Based Fuzzy Inference System (ANFIS). The precise information of rotor speed and position is required to perform maximum power tracking in variable speed wind turbine, which is very difficult to estimate under varying operating conditions, as it may lead to parameter variation...
Retaining sleeves are widely used in high-speed generator to ensure that rotors never move along radial direction and they also would affect the electromagnetic performance of motors. Two-dimensional model of transient electromagnetic field of a high speed PM generator is established in this paper. Several types of sleeves made of different materials such as copper, carbon-fiber and austenitic steel...
Wind energy conversion systems have become important in the research of renewable energy sources. This is not a small part due to the rapid advances in the size of wind generators as well as the development of power electronics and their applicability in wind energy extraction. However, wind energy has a drawback of having only 1/800 density as compared to that of water energy, and it does not remain...
One of the most important drawbacks to the application of the axial flux permanent magnet generator is represented by the relevant mechanical stresses due to the electromagnetic attraction between the stator and the rotor parts, which may arise even in double-side configurations, due to slight air-gap asymmetries. In the paper, a time-effective procedure is presented to analyze the unbalanced condition,...
In this paper, we investigate ways to improve the power conversion of small, rotating, permanent magnet AC machines at low rotor speeds in energy harvesting applications. One method is to increase the pole count, which increases the generator back-emf without also increasing the I2R losses, thereby increasing both torque density and conversion efficiency. One machine topology that has a high effective...
A numerical method for no-load additional loss calculation is presented using the finite element software FEMAG. The loss model adopts a current sheet lying on a slotless stator lamination to simulate the no-load "slotting" effect due to slot openings. Based on the nonlinear magnetostatic analysis of slot harmonics with flux density amplitudes of the slot harmonic pairs obtained through...
Fluctuations in the torque acting on the rotor in a rotating electric generator i.e., cogging, gives unstable rotor motion and can venture reliable operation of the machine. Cogging also gives a similar fluctuation in the output power. This paper presents a study of the cogging force in a linear permanent magnet generator. A constant output power is possible in a rotating machine with three phases...
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