The pace advances principle of work of system of type servo drive

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  • source:PERFSO CNC Machining
The pace basically enters electric machinery drive to control circuit and pace to enter electric machinery by the pace into system of type servo drive two parts composition, following plan institute are shown. Drive control circuitry receives the feed pulse signal that comes from numerical control machine tool to control a system (command signal) , change this signal to control a pace to enter electric machinery winding of each photograph stator depends on this electrify, signal that cut off the power, make the pace runs into electric machinery. The pace is together repeatedly into the rotor of electric machinery and machine tool guide screw, rotor drives guide screw roll, guide screw drives workbench to move again. The pace takes form form is taken from the pace below servo principle block diagram the mobile amount that how servo realizes to move to machine tool workbench, speed and mobile direction undertake commanding 3 respects, to its working principle undertakes introductory. 1.

The controls numerical control machine tool to control a system to give out N that workbench displacement measures feed pulse, after classics drive circuitry, become control pace to enter the electrify of winding of electric machinery stator, n that cut off the power to believe a metabolic frequency N, the N of electrify status change that makes the pace enters winding of electric machinery stator second. Work into electric machinery by the pace the principle is knowable, the metabolic frequency N of condition of stator winding electrify decided the pace enters the angular displacement φ of electric machinery, α of φ ＝ N (α namely) of step pitch horn. This angular displacement changes to measure L for the displacement of workbench via turning after guide screw, nut, (T is pitch) . Namely pace of → of metabolic frequency N takes the position of electrify of winding of stator of quantitative N → of feed pulse the displacement of workbench of corner φ → of electric machinery measures L. 2.

The control machine tool of workbench feed speed controls the frequency F of the feed pulse that the system gives out, after classics drive controls route, expression enters the electrify of winding of electric machinery stator, n that cut off the power to believe a metabolic frequency to command a stage, namely frequency of change of status of stator winding electrify. And the rotate speed ω that the metabolic frequency F of condition of stator winding electrify decided to the pace enters electric machinery rotor. After nut of guide screw of classics of ω of this rotor rotate speed is changed, reflect the feed speed V that is workbench. Namely the feed speed V of the workbench of → of rotate speed ω that the pace of → of metabolic frequency F of the condition of electrify of winding of stator of frequency F → of feed pulse enters electric machinery. 3.

The feed pulse that the control of workbench movement way gives out when control system is to when, classics drive controls route, each winding presses the stator that makes the pace enters electric machinery certain ordinal and ordinal electrify, cut off the power; When feed pulse it is negative to when, drive control circuitry makes each winding presses stator with feed pulse be to when contrary ordinal electrify, cut off the power. The working principle that advances electric machinery by the pace is knowable, receive open telegram of winding of electric machinery stator through the pace sequential change, can realize the control that turning into electric machinery or inverts to the pace, realize the control of the feed direction to workbench thereby. The place on put together is narrated, form is taken in open loop pace in servo, the amount of the feed pulse of the input, frequency, direction, via drive control line road and pace enter electric machinery, changeover is speed of the displacement quantity of workbench, feed and feed direction, realize the control that counterpoint moves thereby. CNC Milling