ŗƆŶƈƃŒ : ƃŒƍ ŗŞŦƆƈƃŒ ｾƒśƆř ŗŕŪœšƃŒ ƏƄŵ ƃ ŜƍťŨƆƃŒ ŧƒźƆƃŒ ŗƆƍŲƈƆ 28 8 ƃŒƍ ŗŞŦƆƈƃŒ ｾƒśƆř ŗŕŪœšƃŒ ƏƄŵ ƃ ŜƍťŨƆƃŒ ŧƒźƆƃŒ ŗƆƍŲƈƆ ŗƆŶƈƃŒ ƑƄŵ ŇœƒŰ ťƍƆšƆ ťƆšŊ ŧŪœƒ ťŵœŪƆ ŦœřŪŊ ťŵœŪƆ ũŧťƆ ƃŒ ƅŪſ ŗŪťƈƌ ƃŒ œŕŧƌƂ ŗƒő - ｾŮƍƆƃŒ ŗŶƆœŞ ŗŮƚŤƃŒ Ɖƈ ũŮŕŗƈƅŔ ũŕƔśƅŔ ŚŔũŔũŠ ŧŸś ƇŧƁŌ řŷŕƊŰ ŕƎƈƍŌ Ɖƈ ƓśƅŔƏ řƔŷŕƊŰƅŔ ŚŕƂƔŗųśƅŔ Ɠž ŚƈŧŦśŬŔ ƓśƅŔ ŚŔũŔũŠƅŔ ƅŔ ƉƔţŔƏų řŷŕƊŰ ŖƆŰƅŔƏ ƀũƏƅŔ řƊƔŠŷ . ƇŧŦśŬś ƓśƅŔ ŘũŧƂƅŔ ŚŕƔƊƏũśƄƅŏ ũœŔƏŧ ŪũŗŌ Ɛŧţŏ ŞƏŧŪƈƅŔ ũƔżƈƅŔ ŘũœŔŧ ŧŸś ũŮŕŗƈƅŔ ũŕƔśƅŔ ŚŕƄũţƈ ƀƏŬ Ɠž . ƎƔž ũƔżƈ ｿƄ ůśŦƔ Ũŏ ƇŪｻŸƅŔ ųｻųŦƈ ƉƈŲ ƉƔſƆśŦƈ ƉƔŸŗũŗ ƃũţƈƅŔ ｿƔżŮśŗ ŕ - ƓŷŕŗũƅŔ ũŮŕŗƈƅŔ ũŕƔśƅŔ ũŔũŠ ƃũţƈƅŔ Ŷƈ ŘũœŔŧƅŔ ƋŨƍ ƃƅŨŗ ŢŗŰśƅ řŷũŬƅŔ . řｻƅŕţƆƅ ｿƔżｻŮś şœŕｻśƊ ƑƆŷ ｿƏŰţƅŔ Ƈś řſƆśŦƈ šŧƁ ŕƔŔƏŪ ŧƊŷ ƉƔũƔżƈƅŔƏ ƃũţƈƅŔ ŚŔũŕƔśƏ ŚŕƔśƅƏſƅ ŘũƂśŬƈƅŔ . Ə ƑｻƆŷ ｿｻƔŝƈśƅŔ ŞŨƏｻƈƊ řţŰ Ɛŧƈ Ɖƈ ŧƄōśƆƅ ŗŬŕţƅŔ ŞŨƏƈƊƅŔ ŘŕƄŕţƈŗ ř ƒũŗśŦƈƅŌ ƓƆƈŸƅŔ , Ƈｻś ŕƈƄ ｿƔŝƈśƅŔ şœŕśƊŗ ŕƎśƊũŕƂƈƏ ũŗśŦƈƅŔ Ɠž řƔƆƈŷ şœŕśƊ ƑƆŷ ｿƏŰţƅŔ Ƈś ｿƔŝƈśƅŔ şœŕśƊ Ŷƈ řƔƆƈŸƅŔ şœŕśƊƅŔ řƊũŕƂƈ ƇśƏ ʼnŧŗƅŔ ｿŝƈ řƔƄũţƅŔ ŚƛŕţƅŔ űŸŗ ƑƆŷ ｿƏŰţƅŔ . ƌｻƆƄ ƃｻƅŨ Ƒｻƅŏ ŽŕŲƔ ƃƅŨƏ ŖųŸƅŔ Śƛŕţ ｿŝƈ řƔŸƔŗų ũƔŻ ｿƔżŮś Śƛŕţ űŸŗ ƓŗƏŬŕţƅŔ ŞŨƏƈƊƅŔ ｿƜŦ Ɖƈ . Modeling and Computer Simulation of a Dual Converter System Dhaiya Ali Al-Nimma Yasser Ahmed Mahmood assist. Prof assist. Lecturer Elect. Eng. - University of Mosul Abstract DC Drives have been used and still being used in many industrial applications as adjustable speed drives. Among these applications are robotics, mill, steel, cement…etc, [1] industries. The dual converters are the most common power electronics equipments that are used in driving DC motors. Each converter drives the motor in two different quadrants in the torque-speed diagram, thus the drive system becomes a four-quadrant. Computer Simulation results has been obtained for the steady state condition. The results are in the form of motor and converters currents and voltages for different trigger angles. In order to validate the simulated results, practical results have been obtained for the same triggering angles. For dynamic conditions such as starting condition have been obtained practically and compared with the simulated results, be sides that studying some abnormal conditions such as fault condition with in the motor or in the dual converter. Key words: DC drives, simulation of DC drive, dual converter. ϲϓ ϢϠΘγ΃ 2008/4/21 ϲϓ ϞΒϗ 2008/8/21