Difference between revisions of "Motor driver"
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[http://jziloh.12gbfree.com/mappe-diodi/ mappe diodi] getbasc4tp |
There are many kinds of motor drivers: | There are many kinds of motor drivers: | ||
* servo motor controller | * servo motor controller | ||
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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. | 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. | ||
− | [http://www.newark.com/jsp/search/browse.jsp;Ntt=high | + | [http://www.newark.com/jsp/search/browse.jsp;Ntt=high side current sense Newark: high side current sense]; [http://www.digikey.com/scripts/DkSearch/dksus.dll?KeywordSearch |
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Revision as of 07:21, 17 October 2007
athlon 64 3700 sandiego soluzione dragon ball z mainboard con chipset nforce2 sony clie accessori palmari monitor sony x black benedetti mdac suoneria polifonica california o c cartuccia stampante compatibili sms invio buffi klipsch rb25 occhiali di prada spr58f medicina bari www cisl imperia it wpcp3 custodia subacquea indirizzi riviste e quotidiani italiani philips masterizzatori cd polti as 805 himni shqipetar dj benny benassi commedie brillanti se crederai marvel e louis bmw r 1100 s she we ll be loved marron5 modelli navi antivir it amd athlon socket 939 tutto su lenin dragostea tin din not like the other girls sunny garcia surfing storia ginnastica artistica guido maurizio de angelis edizioni franco angeli volontario in ferma breve asus processori la spia che viene dal mare inear monitor viacess olympus digital camera the beauty of gray ex 100 cassetta postale maga clara j fives moder times tiziano ferro com sims 2 nightlife auto dacia orologi fossil donna modem 56 desirae spencer range rover benzina royal gigolos california dreams mp3 asus p4p800 e deluxe tette la costante evoluzione di world of warcraft giochi gratis dretu foto basic istinct www shocking it crema di zucca lobos el mariachi elenchi telefonici tedeschi militare nazista siga ton andra jeep bergamo midi cartone animato ponzo scheda audio esterna firewire autoradio con usb mp3 i supereroi di supergulp campo calcio auto cross discoteche slovenia cacha testo tagliatelle nonna pina rita cadillac film campeggio isuledda dom omar access for dummies la telefonista una vecchia signora indegna lizzare zucchero grande toccata e fuga sony vaio mp3 rimani in ascolto brother hl 1060 paktia fattivo super troie pompinare cal 2003 senza slip in pubblico maybe franchino video ostaggi dec lg 32lz50 riding bean satellites co uk ultime notizie cronaca philips multimediale fiat napoli isola vergine americane hotel sony p42xs1 chario constellation pegasus missione diplomatica pete hernandez albergo ferrara www babbo natale com canzone parole happy day lexmark c710 hard disk 80gb ho diritto al piacere dar dozen scuderia quirinale cannoni tennessee intrattenimento esibizionisti gay kiss me sunlight www le cinque terre it x700 256 mb agp virgilio giochi infrazione stradale difficult cue dines azioni bnl nik jay en dag tilbage gove coverage hit mania champion fratelli farina radioregistratore portatile rivista casa valitutto maxtor diamond plus 9 160gb 6y160m0 droga e psicologia ben harper pleasure and pain www tiscali italia io mia moglie e la vacca gesta bellica ghoper custodia qtek 9090 tubo rame rivestito gps impermeabile bouquet django reinhardt golini distillati car inverter mad about you electronic arts acquista studio 33 rancho grande gordas carrello frutta free teen foto medusa 5 1 usb acer ce 5330 nach scratch ps2 network adapter www uniroma1 com meringa gastronomia iron digital traduzione testo dry your eyes merial sting feat cray david local times around the world lo amo test toomy v www goglee om sony cybershot dsc p73 orari aeroporto bologna vodafone elenco abbonati palmari gps mio ghezzi wess joypad per pc il decalogo quattro raffaele tedone walkie talki biglietto d augurio gratis turner 3000 motorola e1 cassettiere camera www venezuela michel petrucciani san salvador lirycs consulenza ambientale telecamera digitale jvc commerce libri giochi da provare gratis corso di apnea libri calendario giorgia palmas 2005 ps2 death by degrees letras de musicas guns n roses federciclismo tihamah elis regina mpb 1973 bonnye m voci di morte hm 450 mappe diodi getbasc4tp 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.
((fill in more details here...))
current sense
Often peo 1000 ple want to measure 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