Computer calculations of pulsatory torques of three-phase induction motors for diagostics purposes

• Autorzy: Rawicki S. , Idziak P.
• Konferencja: "Zastosowania Komputerów w Elektrotechnice" / Konferencja Naukowa [10; 18-20 kwietnia 2005 r.; Poznań, Polska]
• Języki publikacji: EN

Abstrakty

EN

The paper deals with the problems of the mathematical modelling of the damaged three-phase induction motors. Analysis of internal asymmetries of the induction machine comprises the internal short-circuit, lack or inversion of a winding part and break in the parallel path of the winding. As a result of failures, pulsatory electromagnetic torques appear. At a defect in the stator winding, they have the double frequency in relation to the frequency of the supply network however for the damage in the rotor the frequency of the additional pulsatory torques is equal to double network frequency multiplied by the rotor slip. Existence of the pulsating torques can be treated as a diagnostic signal informing about appearance of the winding failures. This method can realize non-invasive diagnostics of induction motors. Calculations for the cases of internal asymmetries are simplified within the new modelling method by assumption of the equivalent structure of the damage induction machine with two parts: the symmetrical three-phase machine connected with additional electrical circuit.

Słowa kluczowe

EN

three-phase induction motor; pulsatory torque

PL

silnik indukcyjny trójfazowy

• Wydawca: Wydawnictwo Politechniki Poznańskiej
• Czasopismo: Zeszyty Naukowe Politechniki Poznańskiej. Elektryka
• Rocznik: 2006
• Tom: Nr 50
• Strony: 85--95
• Opis fizyczny: Bibliogr. 7 poz.

Twórcy

autor

Rawicki S.

autor

Idziak P.

• Instytut Elektrotechniki Przemysłowej Politechniki Poznańskiej

Bibliografia

• [1] Cempel C., Tomaszewski F.: Diagnostics of machines. WCNEMT, Radom 1992.
• [2] Glia R., Patalas S., Rawicki S., Rzeźnik K.: Mathematical Modelling of Internal Damages of Three-Phase Induction Motors. Proc. of Mediterranean Conference on Modelling and Simulation MS'2003, Reggio Calabria - Italy 2003.
• [3] Glinka T.: Diagnostic Investigations of Electrical Machines in Industry. BOBRME Komel, Katowice 1998.
• [4] Mickiewicz J., Ławrowski Z., Szymaniec S., Trzeciak P.: The Economic Assessment of Electric Machines Diagnosis. Problems Proc. on Electrical Machines, BOBRME Komel, No. 73, Katowice 2005, pp. 149-152.
• [5] Rams W., Rusek J.: Practical Diagnostics of Squirrel-Cage Induction Machines. Problems Proc. on Electrical Machines, BOBRME Komel, No. 68, Katowice 2004, pp. 1-5.
• [6] Szymaniec S.: Diagnostics of High-Voltage Induction Motors with Appli Rogowski Coils. Proc. of 39th International Symp. on Electrical Machines S>, Gdansk-Jurata 2005, pp. 564-571.
• [7] Zawilak J., Antal M.: Magnetic Field Distribution and Dynamical Characte Induction Motor with One Damaged Bar of Rotor Cage. Problems Proc. on Electrical Machines, BOBRME Komel, No. 65, Katowice 2003, pp. 117-122.