Motor system for sewing machine

A motor system for driving a sewing mechanism of a sewing machine, comprising:

• a motor unit, which is rotatable at a first rotation speed;
• an auxiliary driving shaft, which penetrates the motor unit in a manner free of affecting rotation of the motor unit, and has a first end and a second end opposite to the first end;
• a clutch unit at least having an output shaft, wherein the clutch unit is controllable to be coupled to or separated from the motor unit, and wherein an end portion of the output shaft facing toward the motor unit is coupled to the first end of the auxiliary driving shaft so as to allow the output shaft and the auxiliary driving shaft to slide in a longitudinal direction with respect to each other, and the other end portion of the output shaft opposite to the motor unit is for driving the sewing mechanism of the sewing machine;
• a speed changing unit mounted on a side of the motor unit opposite to the clutch unit, and having an output portion for switching the first rotation speed of the motor unit to a second rotation speed;
• a position control unit mounted on a side of the speed changing unit opposite to the motor unit, the position control unit comprising a sliding disk slidingly connected to the second end of the auxiliary driving shaft in a longitudinal direction, a positioning mechanism for positioning the sliding disk at a first position, a second position or a third position in a contact-free manner, and a brake mechanism, wherein the sliding disk when being situated at the first position is in contact with the output portion of the speed changing unit;
• the sliding disk when being situated at the second position is free of being in contact with the speed changing unit or the brake mechanism;
• and the sliding disk when being situated at the third position is in contact with the brake mechanism;
• a first sensor for sending a signal according to a status of coupling or separating between the clutch unit and the motor unit;
• and
• a second sensor for sending a signal according to an intended stopping position of the sewing mechanism of the sewing machine;
• wherein the sliding disk is positioned by the positioning mechanism according to the signals sent from the first sensor and the second sensor.