The invention discloses a braking device for a motor driven mechanism. The braking device has a structure that includes a rotating shaft, a rotor core, electric brushes, a bearing, a
commutator segment, a rear end cover, a housing, a
stator winding, a
stator core, a winding coil, an iron core, a coil, an armature, rollers I, an upper guide rail, a limit block, an upper
brake pad, a blade, a connecting rod I, a lower
brake pad, rollers II, a lower guide rail, a front end cover, a spring, a slotting, a baffle, a vertical plate, connecting rods II, and a hinge. The rear end cover is embedded to the rear end of the housing. The front end cover is arranged at the front end of the housing and connected with the housing through a bolt. The rotating shaft penetrates through the front end cover. The rotating shaft is arranged on the central axis of the housing. According to the invention, the braking device for the motor driven mechanism is capable of quickly braking the rotating shaft throughthe upper
brake pad and the lower
brake pad, with small
energy loss and with no need to worry about the aging of the spring, the spring at the bottom of the lower
brake pad enables the lower brake padto rise more quickly, and through the acceleration of the rising process, the rotating shaft can be quickly braked.