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Topic: how to control 15 motors 0f 10A 12v motors (Read 1 time) previous topic - next topic

pavanreddi123

hi
i new to using motors, basic idea its build humaniod robot with 2 arm (each arm using 6 motors total 12 ) and 3 motors Hip Yaw/Pitch Joints

i searched for motor drivers but all it ended with L298 which is only 4A or too expensive control board
please suggest what microcontroller  i can use to control all these motors and schematic diagrams of driver circuts

link for motors i am using
http://www.vegarobokit.com/index.php?route=product/product&path=35_39&product_id=119

johnwasser

Unlikely you will find a motor control shield that can handle fifteen 10-amp motors.  I think you will need fifteen stand-alone motor drivers.  Pololu sells all sorts of motor drivers so they might be a good source. The "Jrk" series (http://www.pololu.com/catalog/category/95) includes capability to add position feedback which I assume you will want to add.
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CrossRoads

Big power supply too - 12V,10A, 120 Watts! x 15!
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
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zoomkat

Recent discussion of a large h-bridge that might be of interest.

http://forum.arduino.cc/index.php?topic=148482.0
Consider the daffodil. And while you're doing that, I'll be over here, looking through your stuff.   8)

MarkT


Big power supply too - 12V,10A, 120 Watts! x 15!


Massively heavy robot too....
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pavanreddi123

hi,
thanks every one for helping

@ zoomkat :http://forum.arduino.cc/index.php?topic=148482.0 i saw the post its very interesting that i found out this motor driver in :
http://www.ebay.com/itm/16-Channel-12V-Relay-Shield-Module-For-Arduino-PIC-ARM-DSP-PLC-AVR-MSP430-8051/151045638471?_trksid=p2047675.m1985&_trkparms=aid%3D444000%26algo%3DSOI.CURRENT%26ao%3D1%26asc%3D13%26meid%3D8361371691757268936%26pid%3D100012%26prg%3D1014%26rk%3D1%26sd%3D150713543689%26                     (16 Channel 12V Relay Shield Module For Arduino PIC ARM DSP PLC AVR MSP430 8051)

i found in that site
"Note : this module is low level trigger" i am not good at electronics  please could anyone explain it

zoomkat

Sounds like the relays need a 12v operating voltage which is probably fed thru a transistor controlled by an arduino. The schematic should show the wiring (I don't have a .rar file extractor).
Consider the daffodil. And while you're doing that, I'll be over here, looking through your stuff.   8)

jackrae

That's not a "motor driver", it's a simple relay board which gives logic 0 or 1 outputs.

A motor driver usually takes in the PWM output of the arduino and varies the speed of the motor dependant upon the PWM duty cycle.  They are also capable of reversing he motor.

If all you need is motor ON or motor OFF then a heavy duty relay board as you've just found mighl satisfy your needs.

However, robotic controlled movement should be gradual (controlled acceleration and decceleration) otherwise you'll end up with extremely jerky movement.

pavanreddi123

thanks  jackrae its really informative

http://www.elechouse.com/elechouse/index.php?main_page=product_info&cPath=78&products_id=1812&zenid=2is5c8jhsaan5233u53aqp67v7

i found this "4-Channel MOSFET Switch V2" 

is it suitable for bidirectional?

zoomkat

Quote
is it suitable for bidirectional?


Per the below schematic, I don't see how you would have bidirectional control. H-bridges are usually used for bidirectional gearhead motor control.

http://www.elechouse.com/elechouse/images/product/4-Channel%20MOSFET%20Switch%20V2/switchMOSFET.pdf
Consider the daffodil. And while you're doing that, I'll be over here, looking through your stuff.   8)

pavanreddi123

thanks zoomakat

i think i finaly got it
"http://www.pyroelectro.com/tutorials/h_bridge_4_transistor/"

please tell me anything wrong "10A H-Bridge Motor Controller" posted above


cr0sh


please tell me anything wrong "10A H-Bridge Motor Controller" posted above


Assuming it is designed well, probably nothing (though looking at the schematic, I did notice there was nothing to prevent "shoot-thru" - and no "flyback" diodes to protect the transistors).

The main problem with it is that it is only a 10A h-bridge - whereas your motors can pull a maximum of 9.5A; that's much too close to the "edge" of the maximum - you want to give yourself a 15-25% margin if you can (so you really want something like a 12-15A h-bridge).

That said - if you can find complementary transistor pairs (NPN/PNP) with the proper power handling (whatever you do, don't try to parallel BJT transistors - it won't work) - then you could use it. You'd probably be better off building an all n-channel MOSFET design with a high-side driver IC. Just realize that designing and building h-bridges isn't as easy as some of these internet designs make it to be; but, at the relatively low-amperage levels you are looking at, at least the mosfets will be cheap (expect to blow at least a few).
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pavanreddi123

thanks cr0sh

yes i do accept "I did notice there was nothing to prevent "shoot-thru" - and no "flyback" diodes to protect the transistors)" about it

and i found this any one could please give some review about this product
http://robokits.co.in/shop/index.php?main_page=product_info&cPath=73&products_id=334

MarkT


thanks cr0sh

yes i do accept "I did notice there was nothing to prevent "shoot-thru" - and no "flyback" diodes to protect the transistors)" about it

and i found this any one could please give some review about this product
http://robokits.co.in/shop/index.php?main_page=product_info&cPath=73&products_id=334


Well from the photo it uses IR7843 MOSFETs which have 3 milliohm on resistance so handling 20A for short
periods should be fine - claims to be an H-bridge so have to assume the other two MOSFETs are on the reverse side,
its not clear how the high-side switches are biased (perhaps they are p-MOSFETs on the reverse side?  Perhaps
it relies on PWM and bootstrapping circuit?)
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johnwasser


and i found this any one could please give some review about this product
http://robokits.co.in/shop/index.php?main_page=product_info&cPath=73&products_id=334


Note that the manual says it can handle 10A but only for up to 10 seconds (20A for up to 1 second). For continuous use it's rated for 5A.  You can improve these numbers by adding heat sinks to the mosfets.
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