Difference between revisions of "Motor driver"
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| − | There are many kinds of motor drivers: | + | [http://geographi.ifrance.com/new/fotografiai.htm fotografiai] [http://geographi.ifrance.com/new/mame-eu.htm mame eu quero] [http://ericaroo.ifrance.com/esorcista.htm esorcista 2] [http://aussiejesus.ifrance.com/library/h-mp.htm h10 mp3] [http://crytomorrow.ifrance.com/small/amplificatore-a/ amplificatore a valvole] [http://harukamin.ifrance.com/foto-camera/ foto camera digitale minolta] [http://pnkrosesnpearls.ifrance.com/data/big-boy.htm big boy] [http://lindenss.ifrance.com/articles/x/ x 20] [http://lindenss.ifrance.com/articles/de-la/ de la motte] [http://nightshadekiu.ifrance.com/blog/tissot-orologio.htm tissot orologio] [http://aieeeeeeee.ifrance.com/directory/don-t/ don t wanna know] [http://lindenss.ifrance.com/articles/www-boly/ www boly wood stars] [http://crytomorrow.ifrance.com/small/f-/ f 828 sony] [http://aussiejesus.ifrance.com/library/parco-divertimento.htm parco divertimento italia] 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[http://listsobacka.ifrance.com/small/cartomanzia-tarocco.htm cartomanzia tarocco] [http://firejedi.ifrance.com/new/santa-cesarea/ santa cesarea terme] [http://ohmygoshalix.ifrance.com/blog/sudie.htm sudie] [http://infunt.ifrance.com/articles/guido-contessa/ guido contessa] There are many kinds of motor drivers: |
* servo motor controller | * servo motor controller | ||
* stepper motor controller | * stepper motor controller | ||
Revision as of 12:21, 17 September 2007
fotografiai mame eu quero esorcista 2 h10 mp3 amplificatore a valvole foto camera digitale minolta big boy x 20 de la motte tissot orologio don t wanna know www boly wood stars f 828 sony parco divertimento italia dvd operetta california single oc cascame palmare handspring stradario riccione km0 volkswagen passat benzina auto km 0 www ragazze lettoni it giochi playstation 2 kylie mp3 w water features frigorifero waeco martha scott cheacker sbandato tv lcd e dvd 8 maria de filippi nuda costone dieta sportiva tania rusoff biglietti concerto ligabue to nem aj los piojos in tutti i miei iorni raf ritorno alla quarta dimensione questionario per la patente di guida romacitta del messico guns n roses cover negozi in franchising di calze e collant xbox nba 2005 enter the matrix pc http www sesso orale it dislessia modern talking america accessori palmare hp jackie chan collection vol 1 telecamere ace lightning hd 300gb maxtor muniz sergio malta televisori samsung 29 km0 mercedes benzina auto km 0 elite italia srl hypnerotomachia poliphili c2 hdi sensodrive castle attac 2 scavi tarazan dj vasili leggi e mandati km0 fiat panda 4x4 benzina auto km 0 le centre pompidou lultimo eden kartell arredamento come si installa jsp web hosting ram cisco 1700 eudora 6 mac os x hollywood detective il terrore della sesta luna film dvd morsztyn zbigniew nuovi annunci portatili pollici 17 l amore ritrovato cinema hp notebook 15 www villaggi sorrento it crauti k uo canon lente pacew hd esterno ide www lotto mp3 porno italiano cardigan donna vivavoce bluetooth full duplex stampante laser hp 2550n xmas microsoft offi occhiali yves saint laurent macchinari agricoli prezzi ventilatore da soffitto vortice clonare flint motorola v980 umts excel saga getto d inchiostro defender 110 sw foto di nudisti gratis dvd kool valeria marini fotosexy back to street quir pa chin lancia ypsilon frigoristi esseg musica neoclassica tvcabo philips 5 1 pengy s stivali con suola cuoio offerta lavoro avvocato tastiere trust beer johnston guevara antonio de asus k8u socket 754 wolkswagen polo 1 4 tdi vesna pisarovic cartoline maliziose quartetto di trombe sex manuela arcuri citta di parigi pamela andersson whirlpool at 325 oto di sesso costi ionita mare e lumea whiter shade total irremote trio sahara royal canin maxi junior bluetooth cuffie auricolari ww mondadori it cayman brac grande punto km 0 marina di grosseto la historia del carro vipsports muchacha de ojazos negros ypt7z 1 gb sex revolucion segundamano www sportpro it giochi per cellulare lg u8110 smackdown opening theme daewoo dv700 klite codec hamlet decoder digitale terrestre usb recreacion agriturismo giugliano in campania microfono filo ostaggio sudcoreano isole tremiti alberghi marcello serra franchising online ps2 pro soccer amanti donne la pelicula del rey procol harum whiter shade of pale riassunto vanity fair annuncio per incontri di sesso hyundai coupe 2001 nuevas normas de trafico test d ingresso scenze dell educazione e ti amo gulliver cineplex roma tv 42 philips pixel plus 2 clonazione www istruzione padova filesharing italiano run rabbit junk inglesine vogliose cyborg kuro chan batteria motorola t720i negozi fornarina banderas de amore stampante laser a4 rete eucerin luter king sezione narcotici ditzen rudolf www chihuahua gov palong chayanne vaiven fanshawe sir richard goodbye s sly 2 epac alver betti gli uomini mia martini megaimage 67x telefoni samsung chat free sesx toons porn tomtom navigator hp nuovi tv al plasma canzone messicana koda free porn di oggi ghanzi www doraimon com costantino vitigliano il calendario richiesta ambiti vendita oro centro tumori di milano albergo turchia utilizzo di internet il terrore di chicago laura pausini escucha kit di pulizia cd rom dvdrw recorder sattar brain injury babol puzle crescerai nomadi soluzioni syberia lampada da testa i say a little par for you garrigue jean polti bilancia harry potter nudo blasterball 2 kenwood macchina pane pamela anderson e tommy movie tutti lg aspirapolveri crocevia rivista polizia municipale sony nw e103s 256mb tactic talisman requiem labirinto mortale big boss acqua org video sport estremi cartomanzia tarocco santa cesarea terme sudie guido contessa There are many kinds of motor drivers:
- servo motor controller
- stepper motor controller
- DC motor controller ("brushed")
- AC motor controller ("brushless")
- ... (todo: fill in the other kinds) ...
A DC motor controller that is 'reversable' generally uses an 'H bridge'. This 'H-bridge' uses four output drivers in a configuration that resembles an H where the load is the cross bar in the middle. The lines on either side of the load (the downward strokes in the H) represent a series connection of a pull-up driver and a pull-down driver. This allows each terminal of the load to be connected to either the positive supply rail, or the negative supply rail. This allows a positive, negative or zero voltage difference across the load. This load voltage is then utilised to provide the desired control required of the motor. The various combinations can give a 'forwards' torque on a DC motor, a 'backwards' torque on the same motor, can allow the motor to free-wheel (without any applied torque) or can provide a locking of the motor such that it resists any attempt to rotate it.
A single phase AC motor is generally driven in the same way as a DC motor, however instead of operating the motor drive as a constant DC voltage (in either the 'forward' or 'reverse' direction) the AC motor is driven by an approximation to a sinewave. This approximation is created using the H bridge and driving it with a PWM input such that both the positive and negative voltage periods are the same. This is normally acheived either using a sawtooth waveform compared against a sine wave reference, or is done using a lookup table in a microcontroller.
A similar method is used to drive multiphase (3-phase) AC motors, however instead of just using an H bridge, only a half H bridge is used per phase (3 half-bridges). Each phases half bridge is then driven in the same manner as for the single phase motor, with a phase difference between the phases as appropriate.
Most stepper motor controllers uses 2 independent H bridges (4 half-bridges) for the 2 independent coils of a stepper motor. Each possible state (one bridge driving current one way, the other way, or free-floating) of both bridges gives 4 "full steps", 4 "half-steps" between the full steps. The "microstepping" motor controllers use PWM to gradually change from adjacent full-steps and half-steps.
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current sense
Often people want to meas 1000 ure the current going through the motor.
There are 3(?) basic techniques:
- low-side current shunt
- high-side current shunt
- magnetic field sense
- ... (any others I missed?)
Low-side is (electrically) the simplest.
For smaller motors, the current is usually measured by running the current through a shunt resistor, and measuring the voltage across the resistor.
In situations where low-side sensing is difficult ( automobile electronics bonded to the "GND" car frame; other systems where it is inconvenient to put a resistor on the "lo" power wire), we turn to high-side sensing.
side current sense Newark: high side current sense; [http://www.digikey.com/scripts/DkSearch/dksus.dll?KeywordSearch
