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

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