Permanent magnetic brushless motor with length adjustable air gap based on load

摘要

A permanent magnetic brushless motor with a length adjustable air gap comprises: a body; a stator secured to one end of the body; a spindle pivotally installed to the body; a part of the spindle protruding from the body; a rotor being axially movable with respect to the spindle by using a sliding unit; the rotor being pivoted in the body and an air gap being formed between the rotor and the stator; a length of the air gap being adjustable; at least one connecting unit two ends of which are connected to the rotor and the spindle; the orientation of the connecting unit being changeable with the rotation angle between the rotor and the spindle; and an elastic unit capable of pushing the rotor to move away from the stator so that the connecting unit moves to a straight state. In the motor, the adjustment of the air gap is automatically performed during the operation of the motor without needing any manual action.