Overhead door system and door operator thereof

A door operator configured to drive a transmission assembly of an overhead door system, the transmission assembly having a shaft rod, the door operator comprising:

• a motor assembly having a rotating shaft operably connected to the shaft rod;
• an actuation assembly having a ratchet wheel and at least one gear train, the at least one gear train operably connected to the rotating shaft, the ratchet wheel operably connected to the at least one gear train, the ratchet wheel transmits a torque in response to activation of the motor assembly;
• a ratchet retaining device, comprising:
• a pawl configured to engage with the ratchet wheel;
• a pawl adjustment assembly having an elastic element, wherein the pawl applies a positioning retention force to the ratchet wheel in response to the elastic element applying a biasing force to the pawl, the pawl adjustment assembly configured to deform, based on a control signal, the elastic element to adjust the positioning retention force;
• and
• a detector configured to generate a detection signal in response to disengagement of the pawl from the ratchet wheel;
• and
• a controller configured to generate the control signal based on the detection signal and at least one adjustment parameter,
• wherein the adjustment parameter ensures that the positioning retention force is sufficient to prevent the ratchet wheel from being rotated by the torque.