Abstract:
A spindle orientation controller couples a spindle motor (2) via coupling means (5) with a main spindle (4) which produces a signal (LS) indicating its approximate stop position and a signal (MS) indicating its definite stop position. This controller is adapted to stop the spindle in position according to a speed instruction that varies depending upon the speed of the spindle motor (2). Speed pulses for detecting the rotating speed of the motor are used as position pulses, and a speed instruction value is decreased by the amount of feedback pulses. When the speed instruction value of the main spindle decreases to a predetermined level, the instruction value is clamped at that level. When the signal (LS) from the main spindle is detected in the clamped state, the signal (MS) from the main spindle is used as a speed instruction value. This makes it possible to stop the main spindle in position quickly.
Abstract:
A method for determining accuracy of an actual position of a plurality of independent motors in a pπnting press is provided The method includes commanding each of the plurality of motors in the pπnting press via a controller to move a desired initial position, comparing an actual position of each motor to the desired initial position of each motor, determining if the actual position of each motor is within a predetermined tolerance of the desired initial position, and resetting any motor outside the predetermined tolerance to be within the predetermined tolerance A pnnting press is also provided The pnnting press includes a plurality of pπnting press components and a plurality of motors Each motor dπves at least one of the pπnting press components and each of the motors has a desired initial position The pnnting press also includes a position detector for determining an actual position of the motor.
Abstract:
A numerical controller having a control function which permits a main axis to be stopped at any absolute position by a drive motor to determine the position of the main axis that controls the positioning. The numerical controller has storage means (6) for storing data related to a motor stop position and the rotational direction included in a control instruction via transfer means (3) which transfers the control instruction to the corresponding drive means, and has calculation means (7) which calculates a drive signal for stopping the motor at a predetermined position based on the stored data and feedback signals related to the speed and position of the motor. With the absolute position such as an angle and the rotational direction up to that position being instructed from the numerical controller, the motor side determines its position by itself.