PURPOSE: To perform stall tension operation for as long as possible when the diameter of a rewind roll is small by allowing a field current at the time of the maximum coil diameter to flow at the time of stall operation to reduce an armature current.

CONSTITUTION: The reference of an armature current is provided by a reference calculation circuit 4 for generating the reference of the armature current at the time of stall operation from each output of a reference generator 2 for providing the reference of the maximum field current and a coil diameter detecting circuit 3 in accordance with the reference of tensile force provided by a stall tension setting device 1 for providing a stall tension reference at the time of stall operation. On the other hand, the output of a tension detector 5 for detecting actual tensile force is calculated in comparison with the reference of tensile force of the tension setting device 1 to add the output of a tension control circuit 6 for performing tension control to the reference of an armature current as a corrective signal and to provide an armature current reference signal to the current control circuit 7 of a driving device. Thereby, since a stall current become small, the permissible time of stall operation can be extended.