The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 28, 1991
Filed:
Mar. 05, 1990
David E Walker, Mississauga, Ontario, CA;
Other;
Abstract
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.