Synchronous control device, synchronous control system, synchronous control method, and simulation device

A synchronous control method comprising:

• a spindle command position calculation step of calculating a spindle command position with respect to a spindle servo control mechanism;
• a spindle phase calculation step of calculating a spindle phase based on a spindle feedback position in the spindle servo control mechanism;
• a spindle speed calculation step of calculating a spindle speed based on the spindle feedback position;
• an advance angle amount calculation step of calculating an advance angle amount corresponding to the spindle speed;
• a driven shaft command position generation step of generating a driven shaft command position based on a driven shaft command phase for controlling a driven shaft motor;
• a projected driven shaft command phase calculation step of calculating a projected driven shaft command phase by adding the advance angle amount to the spindle phase;
• and
• a driven shaft command position variation suppression step of generating the projected driven shaft command phase as the driven shaft command phase in a predetermined case where a sign of the spindle speed is reverse from a previous period, and generating the driven shaft command phase in the previous period as the driven shaft command phase in a predetermined case where the sign of the spindle speed is not reverse from the previous period, wherein the sign refers to whether a value of the spindle speed is either positive or negative,
• controlling the driven shaft motor using the generated driven shaft command phase.