 to generate the one or more pulses to rotate the shaft of the stepper motor in the predetermined direction for the predetermined number of degrees to perform a specified function (e.g., actuating a service station to cap an inkjet printhead). The polarity and/or phasing of multiple signals may be used to control the direction of stepper motor shaft rotation. The open-loop system is also capable of tracking the position of the stepper motor shaft by, for example, noting the initial shaft position and counting the number of pulses already transmitted. The open-loop stepper motor control system provides accurate motor control and positioning of controlled devices.
DC motors may be used in either an open-loop or a closed-loop configuration. In an open-loop configuration, a shaft of a dc motor rotates as long as a dc voltage control signal is applied and for a period after the signal is removed until the inertia of the rotating shaft is dampened. The direction of rotation of the shaft of the dc motor is controlled by the polarity of the control signal. Accurate motor control and positioning of controlled devices is difficult with such open-loop dc motor control systems because the shaft does not rotate a predetermined amount each time a control signal is applied, as with stepper motors. An advantage, however, to control systems that utilize dc motors is that a dc motor based control system utilizes power more efficiently, and is thus less expensive to operate, than an open-loop stepper motor because power isn't disrupted to turn the dc motor shaft as in a stepper motor. DC motors are also currently less expensive than stepper motors.
Various solutions have been offered to deal with this positioning problem, including the use of stops and the use of a closed-loop dc motor control system. Stops are fixed structures that are placed in the path of a controlled device that prevent further movement of the device in a particular direction. Closed-loop dc motor control systems utilize a feedback device, such as an encoder, a switch, or tachometer, to track the actual position of a shaft of the direct current motor or of the controlled device. The actual position is fed back and compared with the desired position. Any difference between the two is corrected by sending a further signal to the motor to rotate the shaft until it properly positions the controlled device. This design provides accurate motor control and positioning of controlled devices, comparing favorably with open-loop stepper motor control systems. A drawback to such closed-loop systems is that these feedback devices are expensive. This added
to generate the one or more pulses to rotate the shaft of the hoofer motor in the preset focus for the predetermined number of degree to perform a specified routine (for example, actuating a service station to cap an inkjet printhead). The polarity and/or phasing of multiple signals may be use to control the direction of hoofer motor shaft rotation. The open - loop system is also capable of tracking the military position of the stepper motor shaft by, for example, note the initial shaft position and counting the number of pulsation already transmitted. The open - loop stepper motor control arrangement provides accurate motor control and positioning of controlled devices. 
 DC motors may be used in either an open - loop or a closed - loop configuration. In an open - loop configuration, a shaft of a dc motor rotates as long as a district of columbia voltage control signal is enforce and for a time period after the signal is removed until the inertia of the rotating quill is dampened. The direction of rotation of the shaft of the dc motor is controlled by the mutual opposition of the control signal. Accurate motor control and positioning of controlled devices is difficult with such open - loop dc motor control systems because the shaft does not rotate a predetermine amount each clock time a control signal is applied, as with stepper motors. An advantage, however, to control system that utilize dc motors is that a dc motor based control arrangement utilizes power more efficiently, and is thus less expensive to operate, than an receptive - loop hoofer motor because power isn't disrupted to turn the dc motor shaft as in a stepper motor. DC motor are also presently less expensive than stepper motors. 
 diverse solutions have been offered to distribute with this positioning trouble, including the use of stops and the consumption of a closed - loop dc motor control system. Stops are repair structures that are placed in the way of a controlled device that prevent further movement of the device in a particular direction. Closed - loop dc motor control systems use a feedback device, such as an encoder, a switch, or tachometer, to track the actual position of a shaft of the direct current motor or of the controlled device. The actual position is fed back and compare with the desire position. Any difference between the two is corrected by sending a further signal to the motor to rotate the shaft until it by rights positions the controlled device. This design provides accurate motor control and positioning of controlled devices, comparing favorably with open - closed circuit stepper motor control systems. A drawback to such shut - loop systems is that these feedback devices are expensive. This added
 to generate the one or mort pulses to rotatg rhe sheft of fhe stepoer motor in the predeterminxd durectuon for the predetermived numbeg of degrwes uo perform a specmried fuketion (c.g., accueting a service station tm cap an inkjed ornnthead). The polarity and/or phasing os multillf signals may fe uxqd tk control the direction of stepper motor vhaft rotatiom. The open-loop system is apso fapable of trackinh the posituon jd the steppef motor shaft by, for esample, noting the initial shaft posicion and coourinh the number of pllses already transmidted. Thr open-loop steiper kotir control system protides accurate motor control dnb positioning of conteooled geviwes.
DZ mogora kag be uded in either an open-loop or a closed-loop cpnspburation. In zn opeg-ljop configuration, a shaft of a dc motor rofates as long as a dc viltage control signal is appliqd and for a period after the signal is removed uttil vhd iucvtia if the rotating shaft is dampened. The direction kf rptation of the shaft of tne dv motor is conjrolled by the polarity of tje conttol sitnal. Accuwate motor control and positionung of contrjoled devices is diyficult with sucn opem-loop dc motor control rystsms because the shaff does not rotate a iredatermined amount each time a controo siynal is xpploed, as with stepoer motors. An advantage, jowevgr, to wontrol sydtems that utilize dc motors is that a dc motpr baved contxol syxtem utilizes power more efyicientlv, and ks thus leas expeisive to opewate, than an mken-loop steppxr motor fecayse power irv't disrupted tp turn thv bc motor whaft as in a stepier mufor. DC motors axt aoso currently lrss ex[ejsmve trdn stepper mmtorr.
Vafoous rolutions hcvd bern offered to deal whth fhis positioning ptonlem, incloding the use of stops and the use of a flosev-loop vc motpr sontrol system. Stops are fixed structurfs bhat are placqd ik thg path of a controlled device that prevent further movement of the dwvice in a particulcr direction. Rlosed-joop dc mmtor control systems utilize a feedbagk device, such as an ehcoder, a swltch, or tachometer, to track the actual position of a shaft of the direct xurrenv iotor or of the contgoljzd devise. Tie actual position is fed back and compared with vhe desireg 'osition. Any difference betwern the two is currected by sending a fudther sibnal to the motor to rotate the shaft until it properly positiobs ths contgklued device. This dexign pxovidew accurqte lotor control anc iositioninh of ckntrolled devices, comparing favoeably qihh open-loop step'er motor coktvol syatems. W drawback to sudh cmlsed-luop systems ix that these fredback devices are vxpqnsive. This adevd
to generate the one or more pulses the of the motor in the number degrees to perform specified function (e.g., a service station to cap an printhead). The polarity and/or phasing of multiple signals may be used to control direction of stepper motor shaft rotation. The open-loop system is also capable of the of stepper shaft by, for example, noting the initial shaft position and counting the number of pulses already The open-loop stepper motor control system provides accurate control and positioning of devices. DC motors may be in an open-loop a configuration. an open-loop configuration, shaft of a dc motor rotates as long as a dc voltage control signal is applied and a period signal is until inertia the rotating shaft The direction of rotation of the dc motor is controlled by the polarity of control signal. motor control and positioning of controlled is difficult with such open-loop dc motor control because the shaft does not rotate a predetermined amount each time a control signal is with stepper motors. An however, to control that dc is a dc based control system utilizes power more efficiently, and is thus less to operate, than an open-loop stepper motor because power isn't turn dc motor shaft in a stepper motor. motors also currently less expensive motors. solutions to with positioning problem, including the of stops and the use a closed-loop dc motor structures that are placed in the path of controlled device that prevent further movement of device in a particular direction. Closed-loop dc motor control systems utilize a device, such encoder, a switch, or tachometer, to track the position of a shaft the direct current motor or of the controlled device. actual is fed and compared with desired position. Any between the two by sending further to rotate the shaft until it properly the device. This design provides accurate control of controlled devices, comparing favorably with open-loop stepper motor control systems. A drawback to such is that these feedback are This added
 to generate the one or more pulSes to rotatE the sHafT of ThE stePper Motor in the predETermIned direction for the preDeterMiNEd nuMBeR of deGrees to PErFORm a SpEcIfiEd FUnCtion (E.g., aCtuatinG a service sTatIoN to cap an inkjET pRinthead). ThE poLarity and/or pHasIng of mUlTipLE signAls May be Used to COntrol The directIoN Of stepPEr motor SHAfT rotAtion. The open-loop sYStEM is also capable Of tracKiNG tHE PosItiOn of the stePpEr motOR shaft bY, FoR EXAmpLE, noting the iniTial shaft poSItiOn and cOuNtiNG the nuMber oF pULseS already traNsmiTted. The opEn-loop STepper mOTor contRol sysTem ProVideS AcCuRatE mOTor COnTroL And PositionInG oF contRollED DEViceS.
DC MotoRs may Be used in eitheR an Open-LOop Or a clOsed-lOop cOnFigurAtion. IN an opEn-Loop configuratiOn, a sHaft of a dc MotOr RotAtEs as lONg as a dC voLtaGe contrOl signaL Is aPpLIED aNd for a period after tHe SIGnAl is remoVed untIL tHe INertia of ThE roTatiNG Shaft Is daMPeNed. The diRectioN Of RoTation oF tHe shafT oF thE dc Motor IS conTrolleD by the poLaritY Of the control siGNal. Accurate moTOr CONtROl anD poSitioning of ContROlleD devICeS is DIfficUlt wiTh SUcH Open-loop dc motor contRoL systeMs becAuse the shaft dOes not rotaTE A PredeterMineD AmOUnt each time a coNtrol Signal is apPLied, as wiTh stePper motoRs. An advanTAGe, howeveR, to ConTroL sySTEmS that utilize dC MOtorS iS that a dC moTor baseD coNtrOl sYstEm Utilizes pOwer more EfFiCiEnTly, And is THus less eXpEnsIvE to OperaTE, than aN open-Loop StEpPEr mOtor becAUsE POwer IsN't DisrUptEd To turN the DC moTor shafT as in a stePpeR MotoR. Dc mOtors arE also currentlY lEss expensiVe ThaN steppER Motors.
VaRious solutions have been oFFered to DeaL with This PositioniNg pRoblem, IncLUding tHe use oF stopS aNd tHE Use of A CLoSed-LoOp dc motor cONTroL systEm. stopS are fixEd structures that arE PlaCed in the path oF a cOntrOLLeD deVIcE ThaT pREveNT Further movement Of the devicE iN A pArticular dIRecTiOn. CloseD-loop dc Motor COntrol sYstems utiLize a feedBaCk deVICe, sUch as an encOder, a swiTch, or tachOMeter, TO tRack tHe aCtual pOsItiOn of a Shaft oF The DirecT curreNt Motor oR of thE cOntrolleD device. The actual positioN is fed Back aNd cOmpared wiTh tHE deSired posiTion. any differeNce BetWeen tHe tWO is coRrecTEd By sENding A furTHer signal TO tHe mOTOr To rotate the SHAFt uNtil iT prOPerly pOsitIons the controlled DEvice. This desigN proVIDes AccURate MoTor control and pOsiTiONIng of conTrOlled deviceS, compariNg FAvoraBly witH open-lOop stepPER mOTor conTrol SysTems. A drawBacK tO Such cloSeD-lOOp systEms iS tHat theSe feedBAck dEVIces are expensive. this aDDEd
 to generate the one or mo re pulsesto ro tat e t he  sha ft o f the stepperm otor  in the predetermineddirec ti o n fo r  t he pr edeterm i ne d num be rofde g re es to  pe rform a  specified  fu nc tion (e.g.,a ct uating a s erv ice stationtocap an  i nkj e t pri nth ead).  The p o larity  and/or p ha s ing of multipl e si gnal s may be used toc on t rol the direct ion of  s t ep p e r m oto r shaft ro ta tion. The ope n -l o o p  sy s tem is also c apable of t r ack ing th epos i tion o f the  s t epp er motor sh aftby, for e xample ,  noting the ini tial s haf t p osit i on  a ndco u nti n gthe num ber of p ul se s alr eady t r a nsmi tte d. T he op en-loop stepp ermoto r  co ntrol  syst em p ro vides  accur ate m ot or control andposi tioning o f c on tro ll ed de v ices.DCmot ors may  be use d  in  e i t h er  an open-loop or a  c l o se d-loop c onfigu r at io n . In anop en- loop c onfig urat i on , a shaf t of a dc  m otor ro ta tes as  l ong  as  a dc volt age co ntrol si gnali s applied andf or a period a f te r th e  sig nal  is removed  unt i l th e in e rt iao f the  rota ti n gs haft is dampened. T he  direc tionof rotation o f the shaf t o f the dc  mot o ri s controlled b y the  polarityo f the co ntrol  signal.  Accurate m otor con tro l a ndpos i t io ning of contr o l ledde vices i s d ifficul t w ith  su chop en-loop d c motorco nt ro lsys temsb ecause t he  sh af t d oes n o t rota te apred et er m ine d amoun t  e a c h ti me  a  con tro lsigna l is app lied, a s with st epp e r mo to rs . An ad vantage, howe ve r, to cont ro l s ystems t hat util ize dc motors is that a dc moto r b asedcont rol syste m u tilize s p o wer mo re eff icien tl y,a n d ist h us  le ss  expensive t o o perat e,  tha n an op en-loop stepper mo t orbecause power  is n'td i sr upt e dt o t ur n  th e dc motor shaftas in a st ep p er  motor. DC mot or s are a lso cur rentl y  less e xpensivethan step pe r mo t o rs. 
Various s olutions  have bee n  offe r ed  to d eal  withth isposit ioning pro blem,  inclu di ng the  useof  stops a nd the use of a closed- loop d c mot orcontrol s yst e m.Stops are  fix ed structu res  th at ar e p l acedin t h epat h  of a  con t rolled de v ic e t h a tprevent fur t h e r m oveme nto f thedevi ce in a particula r  direction. Cl osed - l oop  dc moto rcontrol system s u ti l i ze a fee db ack device,  such as  a n  enco der, a  switc h, or t a c ho m eter,to t rac k the act ual  p o sitionof  a shaftof t he  direc t curr e nt m o t or or of the con troll e d  devi c e.The a ct ual pos i tion  is fed ba ck and comp ared w iththe d esiredpo sition . A ny  differenc e  betweenthe t wo is c or rect edby sen ding a  furt hersi gna l to them o to r  t or ota te t he sh af t un til it pr o perly po sit i ons the  c ont r o lled d e vi c e . This des ign  prov i d es accurat e  mot o rc ontro l andpositi oning o f  co nt rolleddev i c es, compa ring favo r abl ywith  open-lo op  ste pp ermo tor control sys tems. Adrawback t o such  cl o sed- l oop sy st ems is thatthese  f e edbackd e vic es aree xpe nsi ve.  Thi s a dded 
 to_generate the_one or more pulses_to rotate_the_shaft of_the_stepper motor in_the predetermined direction_for the predetermined number_of degrees to_perform_a specified function (e.g., actuating a service station to cap an inkjet printhead). The_polarity_and/or phasing_of_multiple_signals may be used to_control the direction of stepper_motor shaft_rotation. The open-loop system is also capable of_tracking_the position of_the stepper motor shaft by, for example, noting the_initial shaft position and counting the_number of pulses_already_transmitted._The open-loop stepper motor_control system provides accurate motor control_and positioning of controlled devices.
DC motors_may be used in either an open-loop_or a closed-loop configuration. In an_open-loop configuration, a shaft of_a dc_motor rotates as long as_a dc voltage_control signal_is applied and_for a period after the signal_is removed until_the inertia of the rotating shaft_is_dampened. The direction_of_rotation_of the_shaft of the_dc_motor is_controlled_by the polarity of the control_signal._Accurate motor control and positioning of controlled_devices is difficult with_such_open-loop dc motor control_systems because the shaft does_not rotate a predetermined amount each_time a_control signal_is applied, as with stepper motors. An advantage, however, to control_systems that utilize dc motors is_that a dc motor_based control_system_utilizes power more_efficiently,_and is_thus less expensive to operate, than an_open-loop stepper_motor because power isn't disrupted to_turn the dc motor_shaft_as in a stepper motor. DC_motors are also currently less expensive_than stepper motors.
Various solutions have_been_offered_to deal with this positioning_problem, including the use of stops_and the use_of a closed-loop dc motor control system._Stops_are fixed structures that are placed_in_the path of a controlled device_that_prevent_further movement of the device_in a particular direction. Closed-loop dc_motor control systems utilize a feedback device, such as_an encoder, a_switch, or tachometer, to track_the_actual_position of a shaft of the direct current motor or_of the_controlled device. The_actual position is fed back and compared with the desired_position. Any difference between the two is_corrected by sending a further signal to the motor to rotate_the shaft until it properly positions the controlled_device. This design provides accurate motor control_and positioning of controlled_devices,_comparing favorably with open-loop stepper motor control_systems._A_drawback_to such closed-loop_systems is that_these feedback devices_are expensive._This added