BRUSHLESS DC MOTOR CONFIGURATION FOR A POWER TOOL

Abstract: a power tool with a combined printed circuit board (pcb) having a doughnut shape and located coaxially with a motor shaft. the combined pcb is secured to a heat sink on one end of the motor and a metal end piece is positioned on an opposite end of the motor. the metal end cap and heat sink are secured to one another via fasteners to provide a rigid coupling. a tabbed end piece is provided between the heat sink and the motor stator and is also secured into place via the fasteners. the tabbed end piece includes wire support tabs that provide strain relief to motor coil leads. the wire support tabs extend axially from circumferential locations of the tabbed end piece and include channels to guide the motor coil leads to solder contact points on the combined pcb.

Inventor(s): Andrew T. Beyerl

CPC Classification: H02K7/145 (Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine ))

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