Difference between revisions of "Motor driver"
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* servo motor controller | * servo motor controller | ||
* stepper motor controller | * stepper motor controller | ||
| Line 36: | Line 36: | ||
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 07:22, 6 September 2007
zen mediacenter elezione amministrativa 2006 compilation m2o roger rabbit fox km 0 supporto per videoproiettore da soffitto noi veniamo pantalone tuta uomo immagini da scaricare gratis resistencia date di vasco 2006 squadra omicidi paranapiacaba serra do www uomini edonne di maria de filippi samsung monitor 173p prima super 155 servola terapia alopecia testi di jovanotti usuario tsm100 clk cdi vita privata di un pubblico accusatore metti i pantaloni a philip poesie per matrimoni thomson lettore mp3 just one lasr dance tiger peluche televisore sony 21 pollici arredamenti bar bergamo zara ekrem usb 250 gb hard disk e floppy siemens sl 740 linio da cda a mp3 www libri kids collection vol 02 sega a nastro free download emule bogza geo hit my heart benny www geneologia com it teatro la fenice il colore viola whoopi goldberg steven vittoriaassicurazioni it non guardatemi hyundai coupe 20i 16v fx max volante force testi canzoni stampe antiche in tutti imiei giorni rmx farah nuruddin nimis nikon mh 61 centrino 12 golf 2003 librerie akai perle e pirati lee nolin giulietta e una www windows media player it cristina aguilera hard canto liturgico spermi midi di pino daniele hot chat lettori cd e dvd automobile tiempos buenos tiempos malos miguel mateos donna mia martini midi ddr 400 pc3200 olimpiadi atene ms project chemical brother hey boy hey girl accessorio samsung gigi dagostini foto di laghi sobri mon destin il libro di tre metri sopra il cielo www luigi interfree it ns p436 sigma d if il mito vieni da me le vibrazioni hard gay power ellix floigan brothers goodman gilman fmq 45 x prestito autonomi assicurazione al telefono le dolci signore tendoni noleggio dinamite bionda vanelli pile torcia ricaricabili accessori le calde amicizie monteiro boom volleyball baglioni crescendo incontri vercelli suzuky gran vitara giacca e cravata toshiba hd 80gb 2 5 tronador cerro forni da incasso nardi ordine architetti l aquila asus a7v8xx dvd di ligabue finanziamenti bmw volare air one michelle zarrelli striptease lei e matrix cam crossover elettronico a3e 5033h pizzo eraldo tomtom mappe europa senza terra mini video amatoriali auto noleggio trezzano naviglio aw 60 ftt calcio donne hotel maria lcd casio 2 5 telecamere samsung nortek combo italiano spagnolo palmari da 200 apple ipod shuffle 512 mb tenda roulotte gatto con gli stivali obninsk gangbang veneto wake death james joice modern times mp3 claretie jules monster truck madness 1 barracuda heart mitchel vieth follando frigorifero 12 volt roncadin remix dragonstea nad assistenza salerno lacie desktop drive porsche 80gb la piccola mano super eva tessera winner il citoplasma home theatre filo roberta missoni free ringtones valium online cheap zoloft pharmacy online zanaflex online cool ringtones rivotril online prozac online cheap hydrocodone vicodin online cheap paxil ortho online diethylpropion online propecia online sharp ringtones flexeril online ultracet xenical online free funny ringtones free samsung ringtones free midi ringtones sagem ringtones ativan online ultram online free jazz ringtones free sonyericsson ringtones carisoprodol free motorola ringtones qwest ringtones viagra online ambien online free kyocera ringtones tramadol alltel ringtones hoodia online cheap lorazepam cheap xanax free cingular ringtones mtv ringtones lipitor mono ringtones cheap meridia nokia ringtones alprazolam online cheap albuterol clonazepam online music ringtones free wwe ringtones sony ericsson ringtones levitra nexium online free ericsson ringtones cheap zyban sprint ringtones tracfone ringtones free mp3 ringtones cheap lortab cheap clomid vigrx free verizon ringtones cheap celexa diazepam online cialis online free real ringtones lisinopril online cheap fioricet free nextel ringtones cheap wellbutrin tenuate phentermine sildenafil online cyclobenzaprine online free polyphonic ringtones punk ringtones sony ringtones adipex online hgh online norco online didrex soma online 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 people 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
