Patent ID: 6977452
Filing Date: 2005-12-20
Classification: F04D,H02K

Abstract:
1. An electric motor comprising: a stator; a rotor having a shaft, a rotor core mounted on the shaft, a commutator fitted to the shaft adjacent a first end of the rotor core, and windings wound about salient poles of the rotor core and connected to connectors of the commutator, the salient poles having a stem extending radially from a location near the shaft and having a circumferentially extending pole face whereby adjacent pole faces are separated by a narrow gap and adjacent poles forming a tunnel for accommodating the windings open at the radially outer side by the gap, a housing enclosing the stator and having an end wall, adjacent a second end of the rotor core, formed with inlet vents and a side wall formed with exhaust vents adjacent the first end of the rotor core, and an open end; an end cap fitted to the open end of the housing and having additional inlet vents and supporting brush gear, including motor terminals for transferring electrical power to the commutator, and a fan fitted to the first end of the rotor core and arranged to draw air into the housing through the inlets and out of the housing through the exhaust vents, the fan having a ring portion abutting the rotor core, an annular plate formed on the distal end of the ring portion and a plurality of fan blades extending axially and radially formed on a face of the plate remote from the ring portion, wherein the blades extend radially inwardly passed an inner edge of the annular plate and a number of said fan blades are joined to an adjacent fan blade by blade walls, the blade walls forming at least an intermittent annular wall extending circumferentially between the said blades and extending radially from a radially inner end of the said blades to the radial height of the inner edge of the annular plate.