| 摘要 |
PURPOSE:To decrease both the resetting time to an original point and the control time of the original point by defining the original point at a point where the zero-phase signal of the first position detector in a single direction exists and distant away from the position shifted by M pulses in a single direction on the basis of a point where an original point signal is changed to zero from the positive value. CONSTITUTION:A motor 2 drives a material to be controlled, and a position detector 3 is connected to the motor 2. The detector 3 delivers a two-phase rectangular signal and a zero- phase signal (e) and supplies them to a servo controller 1 via a pulse processing circuit 4. The controller 1 detects an original point signal is positive at a position A and gives a command to the motor 2 to have the drive in a single direction. Then the motor 2 is decelerated at and after a point where the original point signal is changed to zero from the positive value. The position of the first signal (e) set after the position of the M pulse is detected is defined as the original point of the material to be controlled. When the original point signal is zero, a drive command of the positive direction is given to the motor 2. Then the motor 2 is reversed at a time point when the original point signal is changed to the positive value from zero and decelerated. Hereafter the original point is decided in the same way at and after a point where the original point signal is changed to zero from the positive value. In such a way, both the resetting time to the original point and the control time of the original point can be decreased. |
