RE: [CAD_CAM_EDM_DRO] Stepper motor voltage VS amps.

Hello Scott,
There is a light:
The driver regulates motor current in pulse manner. Every moment when
current reaches 3 A, (actually, some more then 3 A) driver shut the
current off. Then, after little pause current get to zero. In this
moment driver supply the current again, and the process repeats, with
frequency of 15 KHz or more. So, the average current is never bigger
then 3 A, and this happens on 40-50 Volts.
Real power consumption is 3A * 40 V = 120 Watts.
(Apologize for my English, I never learned it in school)
Peja

-----Original Message-----
From: sriddle68 [mailto:sariddle@...]
Sent: Monday, May 19, 2003 12:28 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Stepper motor voltage VS amps.


I am looking and making a small 3 axis CNC mill for wood routing and
such. I have been surfing through Ebay and it's endless supply of
varied stepper motors. The question I have is this. I see several
postings that say for the power source to use 20-25 times the motors
rated voltage. So if the motor says 2V you should use 40-50V. I
understand this is done for responce and such but what about the
amperage? If it says 2V 3A should you supply 40-50 Volts and 3 amps?
Or do you supply it the same wattage as the motor plate adds up to?
2V x 3A = 6Watts. This seems to low.

If any one can shed some light on this subject for me I would greatly
appreciate it.

Thanks
Scott


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