Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Running-speed control
Patent
1993-01-29
1994-06-07
Wysocki, Jonathan
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Running-speed control
318 85, H02P 700
Patent
active
053192885
ABSTRACT:
A main spindle rotation control method capable of preventing a workpiece from being twisted during the delivery of the workpiece between two main spindles of a machine. When the rotating speeds of first and second main spindles (100, 200) reach a synchronous rotating velocity as a result of a speed loop control executed by velocity control sections (111, 211) of first and second spindle control circuits (110, 210), position loop control is executed by position control sections (112, 212) of these control circuits, and each main spindle is driven to be decelerated in accordance with the rotational phase of each main spindle, and the velocity loop control is then executed again, to bring the main spindles to rotate in the same phase and at the same synchronous rotating speed. When the delivery of the workpiece (300) between the main spindles is started under this condition, integral control in both the velocity control sections is invalidated. Thus, even if a difference is present between the rotating speeds of the two main spindles at the start of the workpiece delivery, due to fluctuations in the main spindle rotating speeds, a difference between torque commands from the velocity control sections, attributable to the difference between the main spindle rotating speeds, never be gradually increased by the integral control, to thereby prevent the workpiece from being twisted.
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Fukukura Masaaki
Kono Shinichi
Fanuc Ltd
Wysocki Jonathan
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