PROCEDURE AND DEVICE FOR MEASURING TORQUE OF ASYNCHRONOUS MOTORS WITH WOUND-ROTOR

摘要

Procedure and device for measuring torque of asynchronous motors with wound-rotor, is achieved according to Figure 1 by connecting: an insulating conditioner for measuring alternating voltage or electric current in rotor circuit of mentioned motors (IKU) or (IKI), and other components. Therewith precisely defined is technical problem of measuring torque (M) is solved very precisely and reliably in a relatively short time interval and positive technical and economic effects in comparison to the known solutions comprised in state-of-art. Processing data for measured complexperiodical functions of time for voltage and electric current in the rotor circuit at the chosen time intervals of (10-50) μs these, first of all expand into Fourier series as harmonics, thereupon determinedis the predominant harmonic (N), and the quotient of predominant harmonic (N) and the measuring time (t) is obtained, frequency of equivalent simpleperiodic sinusoidal function of time for voltage i.e. electric current in rotor circuit for nominal and unknown loading, and finally according to the equation (7) there obtained is the required value of torque (M) of mentioned asynchronous motors.