| 摘要 |
PROBLEM TO BE SOLVED: To solve problems that, when a two-phase stepping motor is used to drive a reel unit and driven in a unipolar state, the number of leads is 5 or 6, and accordingly, it is troublesome and complicated to arrange a plurality of reels in parallel, that, when the motor is driven in a bipolar state, the number of leads is 4, which is smaller than the above case, however, at least 8 transistors need to be used for a driving circuit, that, since vibration is large due to large torque rippl, the coil current of the stepping motor needs to be adjusted to suppress the vibration when the rotation of the reel is stopped and that the number of the magnetic poles of a rotor cannot be increased, high speed rotation at very small angle cannot be achieved. SOLUTION: A three-phase motor is used for driving the reel unit, so that three leads are used, six transistors are employed for the driving circuit, micro- step driving is realized, and the torque ripple and the vibration are suppressed. When the rotation of the reel is stopped, picture patterns are flexibly set and stopped. A movement of very small angle is realized by a command in one step. |
