| 摘要 |
PROBLEM TO BE SOLVED: To improve accuracy of a stop angle when restraint torque in a deceleration state does not become normal due to a production error of a stepping motor, excessive heating, a change of drive current, a secular change of rotation torque or the like.SOLUTION: In a game machine including rotary drums each driven by a stepping motor, variation control means for controlling drive of the stepping motors includes: motor rotation means which circularly selects a plurality of kinds of rotation excitation phases in a prescribed order and drives the stepping motors; displacement angle update means for controlling displacement angle information for identifying a displacement angle of each rotary drum; stop scheduled angle control means for determining a stop scheduled angle of each rotary drum according to a stop instruction; and motor stop means referring to the displacement angle information and stop scheduled angle information according to a stop instruction, and selecting an all phase excitation phase exciting the respective rotation excitation phases collectively, a specific excitation phase making the stop scheduled angle a magnetically most stable displacement angle, and the all phase excitation phase in this order to stop the drive of each stepping motor. |
