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This paper presents the error dynamic model of motorized momentum exchange tether (MMET) based on the momentum exchange principle of space tether. The error dynamics are caused by the structural bias of the differences in tethers' length and the difference in payloads' mass. After that, the coupling analysis between orbit and attitude is presented. It is shown that, with increasing the differences in tethers' length and payloads' mass, the COM deviation of the MMET increases linearly. Thedoi:10.1155/2015/468482 fatcat:fvkocsug3zfnvkurdveime6rzq