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A simple dynamic model is needed to study the dynamic behavior of IC engine driven permanent magnet generator, which is used in hybrid tracked vehicle. The simple mathematical model for the typical engine is developed using look-up table obtained from actual test bed results and physical equations. Permanent magnet generator model is developed by dq equivalent circuit model approach for the typical generator design parameters. The individual Simulink blocks for engine and generator are developed and analyzed. The blocks are interconnected and the system dynamic response due to induced disturbances is analyzed. The response time of the system to overcome the disturbance is calculated and it is within the accepted level.