Outer rotor brushless motor stator mount

A power tool comprising:

• a housing including a main body having an exterior surface exposed to an outer environment and an inner surface forming an elongated opening through which a tool shaft extends;
• a battery receptacle formed on the housing for receiving a power tool battery pack;
• a control module disposed within the housing to control supply of power from the battery pack;
• and
• a brushless direct-current (BLDC) motor mounted on the exterior surface of the main body of the housing, the motor comprising:
• a stator having a stator core, a plurality of teeth extending radially outwardly from the stator core, and a plurality of windings wound around the stator teeth;
• a rotor shaft extending along a center axis;
• a rotor having a rotor core disposed around the stator, a plurality of permanent magnets secured to an inner surface of the rotor core, and an inner annular member mounted on the rotor shaft;
• a first end cap including a radial back plate disposed on a first side of the stator and having a front center opening in which the rotor shaft is supported via a front bearing, the radial back plate being mounted on the exterior surface of the main body of the housing to secure the BLDC motor to the housing, wherein a diameter of a contact surface of the radial back plate with the exterior surface of the main body is greater than a diameter of the inner surface of the rotor core;
• and
• a second end cap located substantially outside the main body of the housing, the second end cap including an inner annular body, an outer annular body, and a main body extending on a second side of the stator from the inner annular body to the outer annular body, the inner annular body extending axially inwardly and forming a rear center opening in which the rotor shaft is supported via a rear bearing,
• wherein the rotor shaft extends into the elongated opening and engages the tool shaft within the main body of the housing.