| 摘要 |
An electric motor drive system having a first electric motor 10, a first drive shaft 18 to which the first electric motor 10 is coupled, a second electric motor 20 having a higher power rating than the first, a second drive shaft 28 to which the second electric motor 20 is coupled, an epicyclic gear system 30 comprising a sun gear 32 to which the first drive shaft 18 is coupled, a ring gear 34 to which the second drive shaft 28 is coupled, and planetary gears 36 meshing with both the sun gear 32 and the ring gear 34, an output drive 40 coupled to the planetary gears 36, and, a one-way rotation restraining means 42 coupled to the second shaft 28 to permit rotation of the second shaft 28 in one direction and to prevent rotation of the second shaft 28 in the other direction for restraining motion of the second shaft 28 during start up of the first motor 10, and a one-way rotation restraining means 43 coupled to the first drive shaft 18 for restraining rotation of the first shaft 18 during start up of the second motor 20, and clutch means 60 operable to interconnect said first and second motors 10 and 20, during 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. |
