Drive control system for motors in numerically controlled machine tools

The drive control system controls a feed shaft motor 22 of a machine tool which has the feed shaft motor 22 and a spindle motor 7. … If the spindle motor 7, when it should properly be rotating at constant speed during a machining operation, is subject to an overload and consequently experiences a dr...

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Bibliographische Detailangaben
Hauptverfasser:	FUJIOKA, YOSHIKI, KOHZAI, YOSHINORI
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	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 TRANSPORTING
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Beschreibung
Zusammenfassung:	The drive control system controls a feed shaft motor 22 of a machine tool which has the feed shaft motor 22 and a spindle motor 7. … If the spindle motor 7, when it should properly be rotating at constant speed during a machining operation, is subject to an overload and consequently experiences a drop in speed, the concomitant rise in armature current Ia is detected by absolute value circuit 32 which is provided by feedback circuit 12 with a voltage proportional to the armature current Ia. A comparator 33 determines whether the armature current Ia exceeds a predetermined level Ia1 and a timer circuit 35 determines whether the predetermined level is exceeded for more than a set period of time t1. If the level Ia1 is exceeded for more than time t1 the feed shaft motor 22 is slowed down. … If the armature current exceeds a higher level Ia2 for more than a different set period of time the feed shaft motor is stopped.