Two stage electric drive

Details Two stage electric drive Two stage electric drive

H - Electricity

02

K

318/10, 318/13

H02K 17/34 (2006.01)

Patent

CA 1240361

ABSTRACT OF THE DISCLOSURE An electric motor drive system having a first direct current electric motor, a first drive shaft to which the first electric motor is coupled, a second direct current electric motor having a higher power rating than the first, a second drive shaft to which the second electric motor is coupled, the second drive shaft comprising a hollow sleeve with the first drive shaft extending therethrough, 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 ring gear to permit rotation of the ring gear in one direction and to prevent rotation of the ring gear in the other direction, and a method of operating such an electric motor drive system.

477594

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