a motor drive system comprising an electric motor having a first drive shaft moveable axially in response to commencement or cessation of operation of the motor and an oil shear clutch operably associated with said motor and having a second drive shaft extending therefrom , the clutch engaging the first and second drive shafts in response to axial movement of the first drive shaft at commencement of operation of the motor and disengaging the first and second drive shafts in response to axial movement of said first drive shaft at cessation of operation of said motor .