POWER TOOL HAVING IMPROVED MOTOR FAN ASSEMBLY

摘要

An electric motor includes a stator, an armature shaft rotatable with respect to the stator, and a lamination stack mounted on the armature shaft and having radially extending teeth forming slots therebetween circumferentially around a periphery of the lamination stack. An armature end insulator is provided at an end of the lamination stack having a base portion fitted around the armature shaft and insulating teeth corresponding to the radially extending teeth of the lamination stack and forming slots therebetween. Motor coils are wound in the lamination stack slots and the end insulator slots. The motor further includes a fan having blades attached to a fan ring and mounted to an end of the lamination stack. The fan ring includes longitudinally-extending tongues arranged to be mounted at the end of the lamination stack and the end insulator includes a plurality of longitudinally-extending notches corresponding to the tongues of the fan ring to allow the tongues to be in direct contact with the end of the lamination stack.

主权项

1. An electric motor comprising:
a stator; an armature shaft rotatable with respect to the stator, a lamination stack mounted on the armature shaft and having a plurality of radially extending teeth forming a plurality of slots therebetween circumferentially around a periphery of the lamination stack; an armature end insulator arranged at an end of the lamination stack, the end insulator having a base portion fitted around the armature shaft and plurality of insulating teeth corresponding to the radially extending teeth of the lamination stack forming a plurality of slots therebetween; a plurality of coils wound in the lamination stack slots and the end insulator slots; and a fan having a plurality of blades attached to a fan ring and mounted to an end of the lamination stack, wherein the fan ring includes a plurality of longitudinally-extending tongues arranged to be mounted at the end of the lamination stack and the end insulator includes a plurality of longitudinally-extending notches corresponding to the tongues of the fan ring to allow the tongues to be in direct contact with the end of the lamination stack.