Re: [CAD_CAM_EDM_DRO] Toshiba DC Brushless Servos

Thanks Jon,
Where do I find info on your boards?
Using EMC and your boards will I get a position display back to the PC or is
it open ended like a stepper system?
Your reasoning sounds correct on the 3 Mhz but I was just reading out of the
manual. The motors max 3000RPM.
Brad

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, February 10, 2004 10:15 PM
Subject: Re: [CAD_CAM_EDM_DRO] Toshiba DC Brushless Servos


>
>
> Brad Eyben wrote:
>
> >Hello all,
> >I have acquired a manual for my Toshiba servo drives and have determined
the following;
> >
> >They require a Speed reference signal -10V to +10v analog signal which
determines full speed CW to full speed CCW
> > Start command signal to enable them, aprox. 1
second after the main DC power, of 24VDC - 5mA
> >
> >They output a dual quadrature pulse train 1024PPR A/A, B/B, and Z -1-PPR
says, The pulse receiving circuit in the controller should use a RS422
differential line receiver, SN75173 (Texas Instruments) or AM26LS32C (TI or
Advanced Micro Devices). The clock speed should be faster than 3 Mhz. The
signal output voltage levels are 0 and 5 Vdc (nominal).
> >They also have a fault output transistor rated 5-24Vdc, 8-50mA.
> >
> >Does anybody have any suggestions for a control. I have a Delta Tau that
came with it, but it is more of a positioner control and doesn't have any
interface for machine code, just loops and macros etc.
> >
> >
> You could use the Servo-to-Go card, or my PPMC board set, with EMC.
>
> 3 MHz? Really? With a 1024 cycle/rev encoder, you get 4096 counts/rev.
> Now, to get a count rate of 3 MHz, you need 3 million/4096 = 732
> revs/second,
> or 44,000 RPM. Can these motors really do 44000 RPM? What will happen to
> your leadscrews at that speed? (I know the answer, they'll look like
> pretzels!)
>
> Jon
>
>
>
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