Hi-
Yes, you need to drive with a higher voltage, but the pulses need to be
short enough not to harm the motor windings.
See: http://www.cs.uiowa.edu/~jones/step/
David

Jim Monteith wrote:

>I built a desktop milling machine a couple of years ago.  It used 5v rated
>steppers, so I hooked them up to 5volts.  I got no torque out of them at
>all.  Called the guy I bought them from, and he said that, though rated for
>5volts, steppers need at least 4 to 6 times the rated voltage to work
>properly.
>
>I run my mill on 24volts.  Has plenty of torque, and have never had a
>problem with any of the motors.
>
>-----Original Message-----
>From: pic microcontroller discussion list
>[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Colin Constant
>Sent: Friday, February 27, 2004 10:44
>To: PICLIST@MITVMA.MIT.EDU
>Subject: [EE:] Stepper motor voltage question
>
>
>Hi,
>
>I've got a stepper motor that's rated at 9.2V (240mA).  I'm just wondering
>how picky these things are about the voltage.  Could I run it off a 9V wall
>wart? Unregulated? Should I maybe add an electrolytic?
>
>I'm using an MC3479 to drive the motor.
>
>At the moment I'm using a 15V wall wart into an LM317 set to 9.2V, which
>works OK except that the 317 runs pretty warm.
>
>Thanks guys,
>Colin
>
>_________________________________________________________________
>Protect your PC - get McAfee.com VirusScan Online
>http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963
>
>--
>http://www.piclist.com hint: The list server can filter out subtopics
>(like ads or off topics) for you. See http://www.piclist.com/#topics
>
>--
>http://www.piclist.com hint: The list server can filter out subtopics
>(like ads or off topics) for you. See http://www.piclist.com/#topics
>
>
>

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics