Search results

This paper aims to work out a method for calculating losses in induction motor steel taking into account its saturation.

The theory of electric machines is applied during the analysis of induction motor equivalent circuits. The theory of Fourier series is used to determine the harmonic components of voltage, current and power. Instantaneous power theory and trigonometric transformations are used to solve algebraic and differential equations and their systems. The methods of approximation and interpolation are applied to obtain analytical expressions from the experimental data. Experimental research was carried out to verify the reliability of theoretical provisions and research results.

A method for assessing an induction machine steel as a function of the generalized electromotive force has been proposed. It allows taking into account higher harmonics of the current, which are caused by the presence of nonlinearity of an induction motor magnetic circuit.

The obtained results can be used in calculating the energy characteristics and operating modes of an induction motor, as well as in the construction of control systems.

A method for determining the losses in the stator steel of an induction motor, using a generalized electromotive force, has been proposed for the first time. It enables taking into account the currents flowing both in the stator circuit and in the rotor circuit.

This paper investigates whether institutional environment influences the relationship government spending and economic growth in ECOWAS over the period 2008–2017.

The study adopts the recently developed panel vector autoregressive (PVAR) by Abrigo and Love (2015) and a two-step system generalised method of moment (GMM).

The results from the study show no evidence of either unidirectional or bidirectional causal relationship between government spending and economic growth in ECOWAS. Our findings reveal that government spending when associated with high level of corruption, oversized government and a waste of public resources will not cause economic growth.

Unlike previous studies, we resolve the inherent problems of endogeneity and persistence in economic data. Likewise, we depart from existing studies that examined the causal relationship in a bivariate framework and adopt a trivariate causality testing.

The purpose of this paper is to examine the direction of causality between government expenditure and economic growth in the Economic Community of West African States (ECOWAS) countries.

The study adopts the recently developed panel vector autoregressive (PVAR) by Love and Abrrigo (2015) and two-step system generalized method of moments (GMM) in order to resolve the inherent problems of endogeneity and persistence in economic data.

The results from the study show no evidence of either unidirectional or bidirectional causal relationship between government expenditure and economic growth in ECOWAS member countries.

Unlike previous studies that adopted cointegration technique, we adopt a system GMM through the application of a dynamic PVAR framework within the framework of panel data analysis in order to address the possibility of feedback effect in the causal relationship between government expenditure and economic growth. In addition the PVAR also allows us to model shocks across countries.