Electric sewing machine motor control device

A motor control device provided on an electric sewing machine for variable speed and needle position stagnation operation, comprises a brushless DC motor having a permanent-magnet rotor, a sewing-machine rotational-speed and polarity detector, a needle-positioning signal detector, a rotor-position detector, a rotor rotation-direction detector, a rotational-speed control means, and a needle-position control means, whereby said control device achieves the variable operation speed and the needle position stagnation of the sewing machine by controlling the mean value and direction of the motor current and further by the operation of said rotational-speed control means and said needle-position control means, characterized in that in a braking process of the sewing machine, the reverse current of the motor is supplied for producing a brake torque as said needle-positioning signal detector detects a specific needle-positioning signal, and that the reverse current producing said brake torque is cut off as the change of the rotational-direction of the rotor is detected by said rotor rotation-direction detector.