Identyfikacja parametrów schematu zastępczego małego silnika indukcyjnego trójfazowego

• Autorzy: Zadrożny J.

Warianty tytułu

EN

Parameters identification of equivalent scheme of three phase small induction motor

• Języki publikacji: PL

Abstrakty

PL

W badaniach i eksploatacji silników indukcyjnych konieczna jest znajomość ich parametrów elektrycznych i mechanicznych. Przedstawiono model symulacyjny oraz analizę wrażliwości dynamicznych przebiegów wyjściowych na zmianę tych parametrów. Na tej podstawie pokazano ideę metody identyfikacji parametrów schematu zastępczego pozwalającą wyznaczyć także charakterystyki statyczne i dynamiczne badanego silnika.

EN

Induction motors, from regard on wide use continually stay as object of intensive research, design and technology works as well. Lately one of important problems of these works became the identification of electric and mechanical motor parameters. This problem means that such circuit motor scheme parameters should be determined as: resistance and inductance of rotor windings Rs and Ls, resistance and inductance of rotor windings (seen from stator side) R'r, and L'r mutual inductance Lm and of moment of rotor inertia Jr. These parameters can be used to determine the motor characteristics and in diagnostics, control systems, matching energy sources as well. Simulation model of three-phase induction motor has been constructed basing on the equations (1), (2), (3) in Matlab/Simulink environment. To basic dq0 model (rys. 1) the blocks of transformation from abc to dq0 as well as from dq0 to abc reference frame and three-phase supply system have been added. The courses of electromagnetic torque Te(t) , supply phase voltage ua(t), phase current ia(t) and relative rotor speed omegar(t)/omegab can be observed. The simulation for determining the kind and quality of extremes on parameters surface theta = [Rs, Ls, R'r, L'r, Lm, Jr] has been done. Simulation has been executed changing consecutively all motor model parameters within range 0.8...1.2 of nominal values. The simulation model of motor - in differential form, with first partial derivative of torque Te in relation to any parameters theta/theta0) - has been treated as input-output system, supplied with three-phase sinusoidal voltage. Exemplary courses of these derivatives are presented in Fig. 2...Fig. 7. On the base of presented results the effective algorithm of identification of induction motor parameters could be constructed. This algorithm is one of more important chain of new synthetic method in order to determine motor behaviours, basing only on measurements during motor starting-up [2]. Exemplary results of identification are shown in Table 1. Exemplary characteristics obtained using method described above are shown in Fig.9...Fig.12. On the base of analysis of shown above courses one can ascertain, that parameters obtained as result of identification using measurements during motor starting-up permit to qualify static characteristics with accuracy 1...2% to real measured characteristics of motor. The mentioned method worked out is simply to use - measurement follows without necessity of disassembling the machine as well as any external rotor devices what are avoided. This method in spite its own simplicity delivers rich information: electric and mechanical parameters, static and dynamic characteristics. It seems, that the basic application of this method may be the diagnostics of machines - especially in manufacturing cycle, and also in any situation, when quick information about basic parameters or characteristics of motor is necessary.

Słowa kluczowe

PL

silniki indukcyjne; maszyny elektryczne; mikromaszyny elektryczne; układy zastępcze; identyfikacja parametrów

• Wydawca: Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
• Czasopismo: Prace Instytutu Elektrotechniki
• Rocznik: 2001
• Tom: Z. 208
• Strony: 199--208
• Opis fizyczny: Bibliogr. 3 poz., tab., rys.

Twórcy

autor

Zadrożny J.

• Zakład Małych Maszyn Elektrycznych, Instytut Elektrotechniki,