Linear drive mechanism

A linear drive mechanism, comprising:

• a casing with openings at both ends;
• a front cover and a rear cover fixed at opposite ends of the casing;
• a stator arranged in the casing;
• a control board is fixed to the casing and the front cover, and spaced apart from the stator;
• a hollow rotor arranged in the stator and rotatably connected to the stator;
• an angular position sensor is configured to collect angular information of a motor comprising the stator and the rotor;
• and
• a ball screw arranged in the rotor, comprising:
• a hollow screw nut fixed in the rotor;
• and
• a center screw arranged on an inner peripheral side of the screw nut and arranged through the front cover;
• wherein the screw nut is rotatably connected to the casing and the center screw;
• wherein the inner peripheral side of the screw nut is provided with first ball grooves that are recessed inwardly and threadedly spiraled at intervals, and an outer peripheral side of the center screw is provided with second ball grooves that are recessed inwardly, threadedly spiraled, and provided correspondingly to the first ball grooves;
• the ball screw further comprises a plurality of balls, and the plurality of the balls are sandwiched between the first ball grooves and the second ball grooves in order to form a rolling connection between the screw nut and the center screw;
• the stator is configured to drive the rotor to rotate the screw nut, to drive the center screw to perform a linear telescopic motion;
• wherein the angular position sensor comprises a second Hall sensor fixed to the control board and located within a magnetic field of the rotor;
• and the second Hall sensor is configured to collect the angular information of the motor comprising the stator and the rotor.