The Paton Welding Journal, 2013, №08



2013 №08 (09)

2013 №08 (01)

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The Paton Welding Journal, 2013, #8, 54-56 pages  

THYRISTOR DIRECT CONVERTERS FOR SUPPLY OF RESISTANCE WELDING MACHINES

P.M. RUDENKO and V.S. GAVRISH

E.O. Paton Electric Welding Institute, NASU. 11 Bozhenko Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
 
Abstract
Machines for resistance and flash-butt welding, power of which can reach several hundreds of kilowatts, are widely used for manufacture of metallic structures and parts. In present time power supply schemes from alternating current main of 50 (60 Hz) frequency, single- and double phase, became the most wide spread for power supply of these machines. Now significant attention is paid to providing of electromagnetic compatibility of energy consumers, especially such powerful as resistance welding machines. This can be provided at uniform loading of three-phase main, including with the help of converters of frequency and number of phases. Aim of the present paper is development and analysis of frequency converters providing uniform loading of three-phase main for existing powerful resistance welding machines, the welding transformers of which are designed for supply from single-phase 50 Hz main. Shown are advantages and disadvantages of the converters operating on 30, 37.5 and 45 Hz frequencies. Pilot specimen of 37.5 Hz converter passed industrial tests during welding of railway rails. 5 Ref., 3 Figures.
 
 
Keywords: resistance welding machines, converters of frequency and number of phases, uniform loading of three-phase main
 
 
Received:                15.04.13
Published:               28.08.13
 
 
References
1. Lebedev, V.K., Pismenny, A.A. (2001) Power systems of resistance welding machines. The Paton Welding J., 11, 28-32.
2. Lebedev, V.K., Pismenny, A.A. (1998) Improvement of power systems for resistance butt welding machines. In: Welding and related technologies into the 21st century. Kiev: Naukova Dumka.
3. Lebedev, V.K., Pismenny, A.A. (2003) Power system of flash-butt welding machines with a transistor inverter. The Paton Welding J., 2, 10-12.
4. Kuchuk-Yatsenko, S.I., Gavrish, V.S., Rudenko, P.M. et al. Method of electric power supply of a.c. single-phase resistance machines. Pat. 86279 Ukraine. Int. Cl. B23K 11/24. Publ. 10.04.2009.
5. Kuchuk-Yatsenko, S.I., Gavrish, V.S., Rudenko, P.M. et al. Method of electric power supply of welding transformer of AC single-phase resistance machines. Pat. 100064 Ukraine. Int. Cl. B23K 11/24. Publ. 12.11.2012.

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