PWM controller for DC servo motor?

space-cake · 9th October 2008, 09:22 PM

This might be a little off-forum... I'm looking for a simple way to drive a 6v 1.5W servo motor in very constant speed (it's a high rev. engine with a gear box). I know some of you guys had build drivers for TT motors so maybe someone has some helpful info? Thanks!

qwertyadam · 10th October 2008, 11:54 AM

http://www.bakatronics.com/shop/item.aspx?itemid=383

rayfutrell · 12th October 2008, 07:00 PM

National Semiconductor application note AN-292 describes a DC motor controller using a PWM IC designed for power supply use.
The speed is controled by measuring the motor back EMF during the pass transistor off period. No tachometer is needed.

Regards,
Ray

SaSi · 18th October 2008, 04:20 PM

Of course, one should also consider that speed variation of the motor is reduced by the same ratio as the one provided by the gearbox. For large reduction ratios, with the gearbox driving some sort of flywheel, even a plain DC motor should be adequate.

9th October 2008, 09:22 PM	#1
space-cake diyAudio Member Join Date: Apr 2006 Location: home	PWM controller for DC servo motor? This might be a little off-forum... I'm looking for a simple way to drive a 6v 1.5W servo motor in very constant speed (it's a high rev. engine with a gear box). I know some of you guys had build drivers for TT motors so maybe someone has some helpful info? Thanks!

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10th October 2008, 11:54 AM	#2
qwertyadam diyAudio Member Join Date: Jan 2007	http://www.bakatronics.com/shop/item.aspx?itemid=383

12th October 2008, 07:00 PM	#3
rayfutrell diyAudio Member Join Date: Sep 2004 Location: virginia	National Semiconductor application note AN-292 describes a DC motor controller using a PWM IC designed for power supply use. The speed is controled by measuring the motor back EMF during the pass transistor off period. No tachometer is needed. Regards, Ray

18th October 2008, 04:20 PM	#4
SaSi diyAudio Member Join Date: May 2008	Of course, one should also consider that speed variation of the motor is reduced by the same ratio as the one provided by the gearbox. For large reduction ratios, with the gearbox driving some sort of flywheel, even a plain DC motor should be adequate.

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