Patent ID: 6867528

Claim:
A dynamoelectric machine comprising: a case; a shaft, first and second ends of said shaft being rotatably supported in said case; a rotor fixed to said shaft and rotatably disposed inside said case; a slip ring fixed to said shaft; a stator fixed to said case so as to surround said rotor; a brush holder through which a brush insertion aperture is disposed, a holder terminal being disposed on an opening edge portion of said brush insertion aperture, and a cover being mounted to a head portion of said brush holder, said brush holder being disposed inside said case such that an aperture direction of said brush insertion aperture is perpendicular to an axial direction of said shaft; a brush assembly mounted to said brush holder; an opening portion formed in a portion of said case facing said cover; and a cap for covering said opening portion, wherein said brush assembly is constructed such that a brush and a brush terminal are linked by means of a pigtail, a brush spring is disposed under compression between said brush and said brush terminal, and a guide member for guiding expansion and compression of said brush spring is disposed inside said brush spring, and wherein said brush is housed inside said brush insertion aperture, said brush terminal is fixed to said holder terminal, and said brush is placed in contact with said slip ring by a force from said brush spring.