Control device for stepping motor, has computing unit for computing deviation between position instruction and rotor position, and another computing unit for computing rotor speed instruction on basis of position instruction

摘要

The control device has a computing unit for computing a deviation between the position instruction (10) and the rotor position, and another computing unit for computing a rotor speed instruction on the basis of the position instruction. An evaluation unit is provided for evaluating whether the position deviation is within a specified range. A phase adjustment unit is provided for adjusting the phase of the coil current instruction on the basis of the rotor position instruction, if the position deviation is within the specified range.