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This study discusses the different techniques for speed control of single-phase induction motor with two asymmetrical main and auxiliary windings based on Rotor Field-Oriented Control (RFOC) method. In the presented methods, transformation matrices are introduced and applied to the equations of single-phase induction motor. It is shown by applying these rotational transformations to the unbalanced equations of single-phase induction motor, equations of single-phase induction motor are transformed into symmetrical equations. These rotational transformations are achieved based from the steady-state equivalent circuit of single-phase induction motor. Finally, a method for RFOC of single-phase induction motor is proposed. Results show the good performance of the proposed method. [ABSTRACT FROM PUBLISHER]

This paper describes exactly a new formulation of the T-matrix method with R-matrix expression for the electromagnetic diffraction efficiency about a case that the dielectric-coated metallic Fourier grating is illuminated by a plane wave. We show that the parameters of numerical calculations are widely applied by using R-matrix expression for the thick dielectric coating although this formulation is restricted for groove depth of the grating in a conventional T-matrix method. [ABSTRACT FROM AUTHOR]

Discusses the profile of a metallic Fourier grating composed of first and second sinusoidal waves. Rigorous expression presented in terms of Bessel functions; Numerical calculation of diffraction efficiencies versus incident angles; Anomalies for the surface plasmon of a gold grating.