Re: [CAD_CAM_EDM_DRO] Questions - 90V/120V motor ok?

Doug,
thank you for an explanation!
Let me ask you: Can I use only half of the rated voltage of this motor,
say 36V? Will I loose lots of torque in this case? I'm concerned
that 90 V 20 A power supply will be too expensive plus I don't
need that much of an RPM anyway.
Alex

----- Original Message -----
From: Doug Fortune <pentam@...>
To: <cad_cam_edm_dro@yahoogroups.com>
Sent: Tuesday, December 17, 2002 10:51 AM
Subject: [CAD_CAM_EDM_DRO] Questions - 90V/120V motor ok?


> alex wrote:
> >
> > Thank you,
> > the first think comes in mind is a treadmill motor.
> > But isn't rated RPM ( over 3000 at 90V) to high for a servo application?
> > Should I use a reducer in this case?
> > Or it will be OK as is?
> > Alex
>
> Thats a perfect motor to use, in conjunction with 80V Geckos
> (and I also presume 80V Rutex drives). 'Standard' DC motors
> come in 12V, 24V, 36V, 90V, 120V, 180V varieties. Using a 36V motor
> you give up too much (you have to use a 36V supply), but 180V
> you are limited to 80/180 of the performance, due to the 80V
> max rating of the Gecko/Rutex drives.
>
> So a 90V motor is fine (I think the treadmill motor is 120V, and
> thats still OK).
>
> For a 90V motor, the max speed will be limited to approx
> 80/90 * max rpm (or 75/90* max rpm if using our 75VDC power
> supply kit, which gives a 5V safety margin for the 80V max drives).
>
> As for a reducer (gearbox or timing belt pulleys), figure out
> what max table speed you want, and calculate a pulley ratio
> to match (this usually means you will also get a torque multiplication
> from the motor, which is good).
>
> regards
> Doug Fortune
> http://www.cncKITS.com
>
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