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U3 and brushless DC motor


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6 replies to this topic

#1 ermips

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Posted 03 March 2013 - 08:06 AM

Hi, Can I command a DC brushless motor (voltage range: 6 18V) with U3 ? Thanks

#2 LabJack Support

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Posted 04 March 2013 - 10:49 AM

Do you just need to control between off and 100% forward? Or do you need variable speed? And do you need forward reverse? What is the maximum current needed for the motor?

#3 ermips

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Posted 08 March 2013 - 01:44 PM

Hi, I'm a newbie and I want to understand motors command with labjack U3 and PS12DC Power Switching Board. Variable speed interest me, if possible of course. Thanks

#4 LabJack Support

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Posted 10 March 2013 - 03:59 PM

What is the maximum voltage and current for the motor? First thing to try is just turning the motor on & off with the PS12DC, but don't try it unless the max current is withing the limits of the PS12DC.

#5 ermips

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Posted 11 March 2013 - 03:46 PM

The motor is a second hand. I can't find tech sheet. So I bought a new servo motor. Thanks for your help

#6 ermips

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Posted 26 March 2013 - 02:02 PM

I connected a DC motor (operating range 12- 24V) with PS12DC. It 's powered by 16V external power supply. Everything works fine but I would want variable speed and forward reverse. How can I do without additional hardware ? Thanks

#7 LabJack Support

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Posted 27 March 2013 - 08:40 AM

For variable speed, you could control the PS12DC switch with a PWM signal, rather than a steady on/off. For example, try using a timer in the 16-bit PWM mode, and if you set the duty-cycle to 50% you should see that the motor spins slower. For forward/reverse, you need an H-bridge. I would suggest getting an actual motor controller rather than making your own.


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