UA91641U - Method for determination of parameters of asynchronous motor at power supply from a source of sinusoidal voltage - Google Patents

Abstract

A method for the determination of the parameters of asynchronous motor at power supply from sinusoidal voltage consists in connection of the asynchronous motor under investigation to power supply source, with use of frequencies of voltage and current, application of voltage to asynchronous motor, digital registration of voltage and current, mathematical processing of the results obtained, with determination of the components of instantaneous power, formation of the system of identification equations on the basis of the equations of power balance for the source of voltage and on the elements of the equivalent circuit of the asynchronous motor, determination of electromagnetic parameters of asynchronous motor through solving the system of identification equations. In the equivalent circuit of asynchronous motor an additional imaginary power supply source, with given amplitude and frequency that is smaller than the voltage frequency, is connected in series to the real power supply source. Thus for the range of frequencies 0-10 Hz voltage and current from the real power source are measured, with determination of harmonic components of instantaneous power for the power sources, with the imaginary source and current from that included, elements of the equivalent circuit, with formation of a system of identification equations of balance of power harmonics for determination of electromagnetic parameters of the equivalent circuit of asynchronous motor, with determination of electromagnetic parameters and component harmonics of currents of the circuits of equivalent circuit of asynchronous motor from imaginary power source.