| 摘要 |
PURPOSE:To improve a vibration suppression effect at the time of starting by adding electrification in a mode of suppressing an increase of torque temporarily at the time of the starting when the torque is large. CONSTITUTION:In the case when a motor standing still in the preceding time is driven at a speed level 1 in the current time, '1' is set in a flag FLG and TA is substituted for a variable TW. Herein TA is set within T1, and after pulse excitation at the speed level 1 is started, the time of TA is the time for continuing electrification therefor. It is set to be the time being matched with the characteristics of the motor and not causing an excessive speed increase. Next, a variable XST for determining an excitation phase made to accord with a step number is calculated and the electrification is started with the excitation phase according with the determined variable XST. Thereby a rotor starts to be attracted to the updated step number. According to this constitution, the motor is checked from starting vibration with an excessive torque obtained. |
