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An electric motor drive system having a first electric motor, a first drive shaft to which the first electric motor is coupled, a second electric motor having a higher power rating than the first, a second drive shaft to which the second electric motor is coupled, an epicyclic gear system comprising

An electric motor drive system having a first electric motor, a first drive shaft to which the first electric motor is coupled, a second electric motor having a higher power rating than the first, a second drive shaft to which the second electric motor is coupled, an epicyclic gear system comprising a sun gear to which the first drive shaft is coupled, a ring gear to which the second drive shaft is coupled, and planetary gears meshing with both the sun gear and the ring gear, an output drive coupled to the planetary gears, and, a one-way rotation restraining means coupled to the second shaft to permit rotation of the second shaft in one direction and to prevent rotation of the second shaft in the other direction for restraining motion of the second shaft during start up of the first motor, and a one-way rotation restraining means coupled to the first drive shaft for restraining rotation of the first shaft during start up of the second motor, and clutch means operable to interconnect said first and second motors, durhg starting of one of said motor, to cause initial rotation of the other of said motors, and a method of operating such an electric motor drive system.

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An electric motor drive system which comprises: a first electric motor having a predetermined power rating; a first drive shaft to which said first electric motor is drivingly coupled; a second electric motor having a predetermined power rating higher than said first motor; a second drive shaft to w

An electric motor drive system which comprises: a first electric motor having a predetermined power rating; a first drive shaft to which said first electric motor is drivingly coupled; a second electric motor having a predetermined power rating higher than said first motor; a second drive shaft to which said second electric motor is drivingly coupled; an epicyclic gear system in turn comprising: a sun gear to which said first drive shaft is drivingly coupled for rotation in a forward direction; a ring gear to which said second drive shaft is drivingly coupled for rotation in said forward direction; a plurality of planetary gears meshing with both said sun gear and said ring gear; an output drive coupled to said planetary gears for conjoint rotation therewith about said sun gear; first one-way rotation restraining means operatively coupled to said ring gear and restraining rotation of said ring gear in a reverse direction only, said first one-way rotation restraining means permitting free rotation in said forward direction whereby said ring gear is free to rotate in said forward direction under the influence of said second motor; second one-way rotation restraining means operatively coupled to said first drive shaft for restraining rotation thereof in a reverse direction while permitting free rotation in the forward direction; clutch means operable to lock said shafts together whereby to apply motion of one said motor, to the other said motor, and, control means for selectively supplying electrical power to one or the other or both of said motors, and for operating said clutch means.