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:
Mar. 13, 1990
Filed:
Feb. 28, 1989
John D Geberth, Jr, Ramsey, NJ (US);
Other;
Abstract
There is provided a totally enclosed electric motor which is effectively cooled by means of an internal ventilation system and an external ventilation system. The internal ventilation system includes an internal fan driven by the rotor which forces internal ventilating air into and along an annular series of longitudinal internal ducts arranged adjacent to the internal cylindrical wall supporting the stator. The internal ventilating air leaving the internal ducts enters a brush compartment where the air is directed axially over the commutator and through the stator-rotor arrangement and back to the internal fan. The external ventilation system includes an external fan driven by the rotor which forces external ventilating air from the atmosphere into and along an annular series of longitudinal external ducts arranged radially outwardly from the series of internal ducts and into exhaust compartments at the far axial end of the motor.