| 摘要 |
PROBLEM TO BE SOLVED: To read smooth and good images by increasing the pulse rate and supplying the pulses created by the pulse rate to pole tooth, when supplying the pulses to a particular pole tooth in a group of stator pole teeth of a stepping motor, thereby stopping the vibration of the optical system load. SOLUTION: Judging from an overall acceleration table, to accelerated excitation after a counted value 83 is performed only by A-B phase for each single period of the circulation of excitation phase switching, and in other excitation phase, a program control for performing the excitation of a constant pulse interval is performed for other excitation phase. This performed since the individual stator pole tooth having a processing precision error creates dispersion in the magnetic flux density formed between the stator pole tooth and rotor pole tooth, so that it is needed to cope with a problem in which the magnitude of the torque vector becomes inconstant continuously as the rotor turns. That is, only a torque vector created only by a particular pole tooth is sued for motor drive control for stabilizing the torque, thus preventing the vibration of a slider unit. |
