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From: jhuang@sci.ccny.cuny.edu (Jian Huang)
Newsgroups: sci.electronics
Subject: Re: Stepper Motors
Message-ID: <1990Feb4.012115.22354@sci.ccny.cuny.edu>
Date: 4 Feb 90 01:21:15 GMT
References: <169@raider.MFEE.TN.US>
Distribution: na
Organization: City College of New York - Science Computing Facility
Lines: 30

In article <169@raider.MFEE.TN.US> ehm@raider.MFEE.TN.US (Erik H. Moe) writes:
>
>I'm working on a project involving the use of a stepper motor.
>Not being really familar with these devices, I was hopeing to
>solicit a little information. The motor has three phases. I have
>been able to step the motor using as little as 1.5V, however to
>get the torque and the speed needed, it will take a lot more voltage
>to make it go. According to the specs on the back of the motor,
>the nominal input voltage is 28V. My question is whether this
>is continous? In a short duration pulse, the current would be
>limited by the inductance of the windings, however, I interested
>in how much continous dc the motor could take. I'm afraid of
>buring it up.
>
>
>					Help
>					ehm@raider.mfee.tn.us
Yes, it should be continous. That is why the stepper has
static torque. As you guessed, it will get less current
when it spin faster. So the smaller torque at higher speed
is a disadvantage of stepping motor. In order to overcome
this, some complex drivers use dual voltage circuitry in
which the higher one apply to motor when it is runing and
the lower one when resting. 

-- 
JIAN HUANG                         System Software Engineer
jhuang@sci.ccny.cuny.edu           Klinger Scientific
jhuang@ccnysci.uucp                Garden City, NY 11530
jhuang@ccnysci.bitnet              (516)745-6800