The paper discusses the design and analysis of synchronous reluctance generator with a rating of 2.1 kW. These generators with low power ratings may be a suitable candidate for the rural electrification. In synchronous reluctance generator, the design of the rotor is the most challenging part of the design. Here, the thickness of the axial and tangential ribs plays a significant role in its performance. The design procedure presented in the paper includes the effect of stator resistance, as it cannot be neglected in the design of synchronous reluctance generator with low power ratings. The paper discusses the design procedure of synchronous reluctance generator and analyses the self‐excited ferrite‐magnet synchronous reluctance generator. Various parameters of the designed machine are analysed through an analytical model and Ansys Electronics Desktop software. Further, the paper also includes the experimental validation of the synchronous reluctance generator results obtained through finite element analysis. The paper also proposes formulae to approximate the minimum values of the excitation capacitor requirement, for a self‐excitation of synchronous reluctance generator with inductive load.
The investigation explores the mechanical stress and electromagnetic performance for a wind-driven synchronous reluctance generator (SRG). The change in the mechanical stress due to the presence of centripetal force, wind speed, and rotor speed are evaluated for different thickness of tangential and radial ribs. Moreover, the variation in the electromagnetic feature such as the q− and d −axes flux, reactance ratio, inductance, torque and torque ripple are discussed for different thickness of tangential and radial ribs. Increasing both tangential and radial ribs thickness has an effect on the electromagnetic performance, but it is observed that effect is significantly more with the variation of tangential rib thickness. Similarly, the mechanical stress analysis for rotor design has been explored in this paper. It is observed that high concentration of peak stress on the rotor ribs, which limits the range of rotor speed.
The Chapter discusses the turbine characteristics to design low-power rating generators. The low-power machine results in small wind turbines, hence distribution of power generators have attracted a growing interest from the demand, for remote and rural electrification. In renewable energy generation the design of the generator from the wind turbine is the most challenging part of the design. The generator specifications have been obtained from wind turbine models such as torque, speed and power. Based on these specifications the design of the generator with rating of 1 kW has been achieved. The turbine characteristics have been studied and various parameters of the designed machine are analyzed through analytical model and finite element analysis.
The present paper analyses the effect of placing the ferrite magnet into the rotor air barrier of synchronous reluctance generators (SRG) on its electromagnetic performance. The paper uses a difference of average electromagnetic torque and ripple torque as a measure of the performance index. Here, in the analysis, a magnetic material is placed in the middle of each air barrier, and its size is symmetrically increased on both sides to increase the percentage of the volume of the magnetic material. The effect of an increase in the volume of the magnetic material on its performance is presented. Moreover, the variation in electromagnetic features such as the d− and q-axes inductance and flux linkage are also explored and compared for different volumes and ferrite material. In the present work, finite element analysis is used to get the electromagnetic performance. The paper also includes hardware validation on the fabricated prototype of SRG (without ferrite magnet), but SRG with a ferrite magnet only includes the results with FEA simulation.
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