DOI: https://doi.org/10.15588/1607-6761-2015-2-8

CALCULATION OF THE OPTIMUM TACHOGRAM ACCELERATION AND DECELERATION OF FREQUENCY CONTROLLED ASYNCHRONOUS MOTORS

V. A. Volkov

Abstract


Analytical calculations of private solutions of a linear second-order differential equation that describes the optimal trajectory of the change (tachograms) rate of variable-frequency induction motor (VFIM)are proposed. Under these tachograms the electromagnetic core loss minimization of engine power to start and stop the mode is ensured. This minimization is carried out for the specified start and end values †of speed and different acceleration and deceleration times. Calculations and comparison between optimal, suboptimal and famous (that are found in the current application in practice) energy saving tachograms sheets (linear and parabolic type, with the shape of a hyperbolic sine) are performed, as well as their respective basic electromagnetic losses of electricity, electromagnetic torque and modulus of the stator current VFIM. The calculated optimal and quasi optimal tachograms are designed for use in AC drives of rolling mills with VFIM working in the intensive start and stop mode

Keywords


asynchronous motor; frequency regulation; optimal tachograms

References


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