Brushless motor system for power tools

A power tool comprising:

• a tool housing;
• a brushless DC (BLDC) motor disposed within the tool housing, the motor including a stator assembly and a rotor assembly rotatably disposed within the stator assembly, the stator assembly including:
• a generally-cylindrical lamination stack having a stator ring and a plurality of stator teeth extending radially inwardly from the stator ring towards a center bore of the stator assembly, wherein the center bore is arranged to receive the rotor assembly therein;
• an end insulator disposed at an and of the lamination stack, the end insulator having a generally-cylindrical outer ring and a plurality of teeth portions extending radially inwardly from the outer ring towards a center of the end insulator, the outer ring and the plurality of teeth portions corresponding to the stator ring and the plurality of stator teeth respectively;
• and a plurality of stator windings wound around the plurality of stator teeth and the corresponding plurality of teeth portion of the end insulator;
• and
• a generally cylindrical seal member disposed to interface with an end of the stator, the seal member including a mating surface having a plurality of indents configured to mate with ends of the plurality of stator windings or ends of the plurality of teeth portion of the end insulator to substantially seal respective gaps therebetween from entry of workpiece particulate.