Raise a pace to take the step of precision of system of type servo drive

Fractionize line is so-called fractionize circuitry, be share the pace again into the one pace of electric machinery a few finer. Be like 10 fractionize circuitry, original input pace of pulse of a feed receives electric machinery make a move to turn into input 10 pulse ability make a move. In other words, after introducing 10 fractionize line, in feed speed changeless circumstance falls, can make pulse equivalent narrows original. If do not have fractionize, the electric current of stator winding is by 0 jump those who rise rating, if corresponding angular displacement pursues 5- - 15(a) place is shown. After using fractionize, the electric current of stator winding should pass the change of a certain number of half step, ability achieves rating, if corresponding angular displacement pursues 5- - 15(b) place is shown. Around of graph 5-15 fractionize weaveform of one pace angular displacement pursues (A) without fractionize (B) after fractionize 2.

Age unoccupied place compensation ages unoccupied place compensation calls backlash compensation again. Mechanical drive chain gets lost in the change when, as a result of the existence with unoccupied place tine, the sky that can cause a pace to enter electric machinery goes, and the real shift that does not have workbench. In open loop servo, this kind ages unoccupied place error machines precision to have very big effect to the machine tool, must try to compensate. Age principle of unoccupied place compensatory is: Measure the volume with an unoccupied place tine first, set for; In machining a process, detect every time when the feed direction of workbench is changed, the direction after the change adds a feed pulse statement, the tine unoccupied place error that the sky that because the pace enters electric machinery,in order to overcomes goes and causes. 3.

Pitch error compensation takes system of drive of servo of type open loop in the pace in, the pitch of guide screw accumulates an error to affecting the displacement precision of workbench directly, if want to raise the precision of system of drive of open loop servo, must give compensation. If compensation principle pursues 5- - 16 are shown. Through undertaking actual measurement to the pitch of guide screw, the error that gets guide screw whole course distributings curve. The error has having negative, it is when the error when, show actual mobile distance is more than academic mobile distance, should use the means that deducts feed pulse instruction to have the compensation of the error, make the pace takes electric machinery little make a move; It is when the error when losing, show actual mobile distance is less than academic mobile distance, should adopt the kind that raises feed pulse instruction to have the compensation of the error, make the pace takes electric machinery much make a move. Particular way is: (1) finds a place for two compensation lever is in charge of correct errors difference and the compensation that lose an error respectively; (2) compensates lever to go up in two, according to the error of guide screw whole journey distributinging circumstance is reached as above the compensation principle of pitch error, the setting compensates switch or link stopper; (3) moves when machine tool workbench when, install the micro-gap switch on the machine tool every and link stopper are contacted, give out an error to compensate signal, undertake compensating to pitch error, with eliminating pitch accumulate an error. Graph 5-16 pitch error compensates principle curve 1, ideal shift (without pitch error) curve 2, real shift (the error that has pitch) curve 3, the error curve curve before compensation 4, the error curve after compensation CNC Milling CNC Machining