/Users/andrea/_magisterarbeit/korpus/clean/testkorpus/30/file15.html NN ----------------------------------------- : Search NP WWW NP Search NP seattlerobotics NNS . SENT org NP Standard NP Technologies NPS of IN the DT Seattle NP Robotics NP Society NP Whats NP a DT Servo NN . SENT A DT Servo NN is VBZ a DT small JJ device NN that WDT has VHZ an DT output NN shaft NN . SENT This DT shaft NN can MD be VB positioned VVN to TO specific JJ angular JJ positions NNS by IN sending VVG the DT servo NN a DT coded VVN signal NN . SENT As RB long RB as IN the DT coded VVN signal NN exists VVZ on IN the DT input NN line NN , , the DT servo NN will MD maintain VV the DT angular JJ position NN of IN the DT shaft NN . SENT As IN the DT coded VVN signal NN changes NNS , , the DT angular JJ position NN of IN the DT shaft NN changes NNS . SENT In IN practice NN , , servos NNS are VBP used VVN in IN radio NN controlled VVN airplanes NNS to TO position NN control NN surfaces VVZ like IN the DT elevators NNS and CC rudders NNS . SENT They PP are VBP also RB used VVN in IN radio NN controlled VVN cars NNS , , puppets NNS , , and CC of IN course NN , , robots NNS . SENT Click NN on IN picture NN for IN larger JJR view NN A DT Futaba NP S NP 148 CD Servo JJ Servos NNS are VBP extremely RB useful JJ in IN robotics NNS . SENT The DT motors NNS are VBP small JJ , , as IN you PP can MD see VV by IN the DT picture NN above RB , , have VHP built VVN in IN control NN circuitry NN , , and CC are VBP extremely RB powerful JJ for IN thier NP size NN . SENT A DT standard JJ servo NN such JJ as IN the DT Futaba NP S NP 148 CD has VHZ 42 CD oz NP inches NNS of IN torque NN , , which WDT is VBZ pretty RB strong JJ for IN its PP$ size NN . SENT It PP also RB draws VVZ power NN proportional JJ to TO the DT mechanical JJ load NN . SENT A DT lightly RB loaded VVN servo NN , , therefore RB , , doesn't JJ consume VVP much JJ energy NN . SENT The DT guts NNS of IN a DT servo JJ motor NN are VBP shown VVN in IN the DT picture NN below RB . SENT You PP can MD see VV the DT control NN circuitry NN , , the DT motor NN , , a DT set NN of IN gears VVZ , , and CC the DT case NN . SENT You PP can MD also RB see VV the DT 3 CD wires NNS that WDT connect VVP to TO the DT outside JJ world NN . SENT One PP is VBZ for IN power NN 5 CD volts NNS , , ground NN , , and CC the DT white JJ wire NN is VBZ the DT control NN wire NN . SENT Click NN on IN picture NN for IN larger JJR view NN A DT servo NN disassembled VVD . SENT So RB , , how WRB does VVZ a DT servo JJ work NN . SENT The DT servo JJ motor NN has VHZ some DT control NN circuits NNS and CC a DT potentiometer NN a DT variable JJ resistor NN , , aka NN pot NN that WDT is VBZ connected VVN to TO the DT output NN shaft NN . SENT In IN the DT picture NN above RB , , the DT pot NN can MD be VB seen VVN on IN the DT right JJ side NN of IN the DT circuit NN board NN . SENT This DT pot NN allows VVZ the DT control NN circuitry NN to TO monitor VV the DT current JJ angle NN of IN the DT servo JJ motor NN . SENT If IN the DT shaft NN is VBZ at IN the DT correct JJ angle NN , , then RB the DT motor NN shuts VVZ off RP . SENT If IN the DT circuit NN finds VVZ that IN the DT angle NN is VBZ not RB correct JJ , , it PP will MD turn VV the DT motor NN the DT correct JJ direction NN until IN the DT angle NN is VBZ correct JJ . SENT The DT output NN shaft NN of IN the DT servo NN is VBZ capable JJ of IN travelling VVG somewhere RB around IN 180 CD degrees NNS . SENT Usually RB , , its PP$ somewhere RB in IN the DT 210 CD degree NN range NN , , but CC it PP varies VVZ by IN manufacturer NN . SENT A DT normal JJ servo NN is VBZ used VVN to TO control VV an DT angular JJ motion NN of IN between IN 0 CD and CC 180 CD degrees NNS . SENT A DT normal JJ servo NN is VBZ mechanically RB not RB capable JJ of IN turning VVG any DT farther RBR due JJ to TO a DT mechanical JJ stop NN built VVN on IN to TO the DT main JJ output NN gear NN . SENT The DT amount NN of IN power NN applied VVN to TO the DT motor NN is VBZ proportional JJ to TO the DT distance NN it PP needs VVZ to TO travel VV . SENT So RB , , if IN the DT shaft NN needs VVZ to TO turn VV a DT large JJ distance NN , , the DT motor NN will MD run VV at IN full JJ speed NN . SENT If IN it PP needs VVZ to TO turn VV only RB a DT small JJ amount NN , , the DT motor NN will MD run VV at IN a DT slower JJR speed NN . SENT This DT is VBZ called VVN proportional JJ control NN . SENT How WRB do VVP you PP communicate VV the DT angle NN at IN which WDT the DT servo NN should MD turn VV . SENT The DT control NN wire NN is VBZ used VVN to TO communicate VV the DT angle NN . SENT The DT angle NN is VBZ determined VVN by IN the DT duration NN of IN a DT pulse NN that WDT is VBZ applied VVN to TO the DT control NN wire NN . SENT This DT is VBZ called VVN Pulse NP Coded VVN Modulation NN . SENT The DT servo NN expects VVZ to TO see VV a DT pulse NN every DT 20 CD milliseconds NNS . SENT 02 CD seconds NNS . SENT The DT length NN of IN the DT pulse NN will MD determine VV how WRB far RB the DT motor NN turns VVZ . SENT A DT 1 CD . SENT 5 CD millisecond NN pulse NN , , for IN example NN , , will MD make VV the DT motor NN turn NN to TO the DT 90 CD degree NN position NN often RB called VVD the DT neutral JJ position NN . SENT If IN the DT pulse NN is VBZ shorter JJR than IN 1 CD . SENT 5 CD ms NN , , then RB the DT motor NN will MD turn VV the DT shaft NN to TO closer JJR to TO 0 CD degress NN . SENT If IN the DT pulse NN is VBZ longer JJR than IN 1 CD . SENT 5 CD ms NN , , the DT shaft NN turns VVZ closer RBR to TO 180 CD degress NN . SENT As IN you PP can MD see VV in IN the DT picture NN , , the DT duration NN of IN the DT pulse NN dictates VVZ the DT angle NN of IN the DT output NN shaft NN shown VVN as IN the DT green JJ circle NN with IN the DT arrow NN . SENT Note NN that IN the DT times NNS here RB are VBP illustrative JJ , , and CC the DT actual JJ timings NNS depend VVP on IN the DT motor NN manufacturer NN . SENT The DT principle NN , , however RB , , is VBZ the DT same JJ . SENT