Motor assembly

A motor assembly, comprising:

• a housing;
• a motor comprising a stator casing, a stator, an output shaft, a rotor, an annular plate, and a rear end cap;
• the stator casing is fixed in the housing and is restricted from rotating along an output shaft, the stator is embedded into the stator casing;
• a circumference of the stator has a plurality of through holes;
• the output shaft passes through a middle of the stator casing;
• the rotor is engaged with a portion of the output shaft where is surrounded by the stator;
• the annular plate abuts against an end surface of the stator casing and an end surface of the stator, and the annular plate has a plurality of screw holes;
• the rear end cap has a plurality of perforations and abuts against another end surface of the stator casing and another end surface of the stator;
• each of the perforations on the rear end cap is inserted by a screw, and each of the screws passes through one of the through holes and is screwed into corresponding one of the screw holes on the annular plate;
• the rear end cap is disposed with a rear bearing, and the output shaft passes through the rear bearing;
• and
• a motor fixing frame engaged with the end surface of the housing and having a front bearing, wherein the output shaft passes through the front bearing, and the motor fixing frame is spaced from the motor.