DEVICE FOR CONTROLLING POSITION

• Main Author: YAMASHITA KAZUTAKA
• Format: Patent
• Language: English
• Published: 30.04.1987
• Subjects: COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOTDIRECTED TO A PARTICULAR RESULT; CONTROL OR REGULATING SYSTEMS IN GENERAL; CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g.ARRANGEMENTS FOR COPYING OR CONTROLLING; ELECTRICITY; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; GENERATION; MACHINE TOOLS; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OFPARTICULAR DETAILS OR COMPONENTS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS; PERFORMING OPERATIONS; PHYSICS; REGULATING; SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES; TRANSPORTING

PURPOSE:To omit the action of returning to a starting point at the time of turning on a power source and enable position control with high accuracy by writing a detected position which is read out from an absolute position detecting device, as a reference, into a detected position register and a command position register. CONSTITUTION:When a power source is tuned on, the absolute position of a table 1 in its initial state, is calculated by a position operating device 12 based on detected data which are detected by a linear type position detector 11 and a resolver 4 and, after transferred to a detected position register 5, it is corrected by a function-type error correcting device 9 at an addition part 10 and, then, transferred to a command position register 6. Then, the register 6 is rewritten according to a traveling command from an NC device, and a motor 3 is driven based on difference between the value of the command position in the register 6 and the value in which correction is given to the present position, in a detected position register 5. The position of the table 1 during traveling is detected by the detector 11 and the revolver 4, calculated as the absolute position in the detected position register 5 and, after corrected to the accurate absolute position of the table 1 by means of the error correcting device 9, it is compared with the command position, thereby, enabling the accurate driving of the table 1.