RE: [CAD_CAM_EDM_DRO] Stepper motors and increased Amps

Tim,

The motors have 6 wires, red, red/white, black, green, green/white and
white. Black and white are the common between 4 coils according to the
document supplied with the motors. Black and White are not used currently.

I am basically curious as to whether increased current increases the torque
provided by the motor. These are rated at 59.7 oz/in holding torque and 34.7
oz/in pull torque.

John

> -----Original Message-----
> From: Tim Goldstein [mailto:timg@...]
> Sent: Monday, January 08, 2001 10:34 PM
> To: CAD_CAM_EDM_DRO@egroups.com
> Subject: RE: [CAD_CAM_EDM_DRO] Stepper motors and increased Amps
>
>
> I am not personally familiar with this motor, but let me ask a few more
> questions to get a general understanding.
> How many wires does the motor have?
> In you Bipolar setup (assuming the answer to the above is not 4) are you
> hooking up to the whole coil, 1/2 coil, or the 2 - halves of the a single
> coil in parallel (only doable on an 8 wire motor)?
> Final question, why do you want to up the amperage?
>
> Tim
> [Denver, CO]
>
>
> > Hi Tim,
> >
> > The motors are Shinnano Kenshi Co.Ltd. STH-55D203-02, 1.8
> Deg/Step, 5.1V,
> > 1A, 6 wire. I have them wired up in Bipolar mode to Dan Mauch's 5 AMP
> > Bipolar Controller cards, currently running 26.5 Volts for the stepper
> > motors in 1/2 step mode.
> >
> > John Guenther
> >
> > > -----Original Message-----
> > > From: Tim Goldstein [mailto:timg@...]
> > > Sent: Monday, January 08, 2001 4:58 PM
> > > To: CAD_CAM_EDM_DRO@egroups.com
> > > Subject: RE: [CAD_CAM_EDM_DRO] Stepper motors and increased Amps
> > >
> > >
> > > From my understanding you will not want to increase the
> > amperage. You also
> > > have to understand how the ratings are figured. If they are for
> > > unipolar and
> > > you are using bipolar series you have to lower the amperage
> by about 40%
> > > from the unipolar rating.
> > >
> > > Please tell us more. How are the motors rated (unipolar or
> > > bipolar) and how
> > > are you wiring and driving them?
> > >
> > > Tim
> > > [Denver, CO]
> > >
> > > > -----Original Message-----
> > > > Ok, here is my stupid question for the day:
> > > >
> > > > If I have steppers that are rated at 5.1 volts, 1 Amp can I safely
> > > > increase the current to 1.5 Amps without blowing the motor?
> How much
> > > > over the rated current can a stepper motor safely handle?
> > > >
> > > > Ok, I know, that's two questions not one.
> > > >
> > > > John Guenther
> > > > 'Ye Olde Pen Maker'
> > > > FAQ: http://www.ktmarketing.com/faq.html
> >
>
>
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