| 摘要 |
The motor frame has a cylindrical body portion with an annular open end portion. An internal end plate is positioned in overlying relation with the motor frame annular end portion and an armature shaft with an armature thereon is rotatably supported in the hub portion of the internal end plate. The armature has a commutator adjacent to the internal end plate. A plurality of field pole assemblies are secured to the motor housing and extend inwardly toward the armature. Each of the field pole assemblies have a pair of field pole coils wound thereon in opposite directions and the coils wound in the same direction are connected in series so that upon energization of one group of coils the armature shaft rotates in one direction and upon energization of the other group of coils the armature shaft rotates in the opposite direction. A brush support holder has a plurality of brushes supported thereon and is positioned in overlying relation with the internal end plate. The brushes supported on the brush support member extend through openings in the internal end plate into abutting relation with the commutator. The brush support ring may be removed from the motor frame to replace all of the brushes while the armature shaft is rotatably supported by the internal end plate. An indexing device is provided to position the brushes at a neutral position on the commutator. An end bell is positioned over the brush support ring and is secured to the motor frame. A brake disc may be attached to the end of the armature shaft and a disc brake secured to the motor frame. |
