Patent ID: 7638912
Filing Date: 2009-12-29
Classification: H02K

Abstract:
1. A brushless motor comprising: a motor mounting plate comprising a first concave portion and a substantially planar portion, the first concave portion being recessed relative to the planar portion, said first concave portion being an integral part of the motor mounting plate formed by press processing, the motor mounting plate further comprising a first convex portion in a center of the first concave portion, thereby forming a circular groove between an outer circumference of the first convex portion and the inner circumference of the first concave portion; a shaft supported by said motor mounting plate, the shaft having an end face contacting the first convex portion of said motor mounting plate either directly or via a thrust plate, a tube-shaped bearing housing comprising a base fitted within the groove of the motor mounting plate and supported by said motor mounting plate, such that an outer circumference of the bearing housing fits against an inner circumference of said concave portion, and a bearing set in an inner circumference of said bearing housing, for rotatably supporting said shaft, wherein at least one second convex portion is located in the groove of the motor mounting plate, the at least one second convex portion extending radially across the groove and having a height lower than a height of the outer circumference of the first convex portion.