On Mon, 22 Oct 2007, Kirk Wallace wrote:
> Date: Mon, 22 Oct 2007 13:43:07 -0700
> From: Kirk Wallace <[EMAIL PROTECTED]>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <emc-users@lists.sourceforge.net>
> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
> Subject: [Emc-users] Brushless Amps
>
> I have a Pacific Scientific R46GENA DC brushless servo motor that I
> would like to use for my Bridgeport conversion, so I am looking for a
> amp/driver to drive it.
>
> The specifications are on page 26 here:
>
> http://www.pacsci.com/support/documents/pc800/svomtrs.pdf
>
> I don't know if it is a sinusoidal or trapezoidal motor so if anyone has
> a way to determine this, please let me know. Is the difference in the
> drive just software?
>
> The specifications indicate an RPM of 1,700 at 240 Vac, 320 Vdc and 16.5
> Amps max., so I assume that I need a 320 Vdc 20 Amp motor supply?
>
> The motor has only Hall sensors. Do the Hall sensors have an analog
> output in order to be able to position the rotor at a desired angle from
> the sensors?
>
> Could the Pico Systems PWM brushless amp be used as a basis for my
> application? In other words, could I change the power components to
> higher voltage/current?
>
> Is a continuous stall torque of 7.6 Nm (67.3 lb*in), and a peak torque
> of 20.2 Nm (179 lb*in) appropriate for a Bridgeport? My plan is to have
> a direct coupling between the motor and ballscrew. I have some Sanyo
> P5's but at 3.9 Nm (46 lb*in) continuous and 11.7 Nm (139 lb*in) peak
> torque, but they seem a little small.
>
> --
> Kirk Wallace (California, USA
> http://www.wallacecompany.com/machine_shop/
> Hardinge HNC lathe
> Bridgeport mill conversion pending
> Zubal lathe conversion pending)
We have an amplifier coming out in a couple of months that _may_ be suitable
Its 30A Peak current, sine wave drive, hall effect current feedback, FOC, 16A
RMS/Phase continuous, 320V nominal DC bus supply (400V Max).
It is an open frame device mounted to an L shaped aluminum "chassis" (you
supply heatsink) It also needs an external DC bus supply (not AC in)
It is just a dumb amplifier designed to work with a high speed serial RS-422
link (5 Mbps), host sends 4 byte packets with header, phase-angle, current,
CS/CRC, and amplifier responds with status/bus voltage/temperature, etc.
By dumb I mean it has no position feedback, no PID loop, just PI loops for
current control.
We will eventually have a separate controller card with analog,
step/direction, and high speed serial PVT inputs, plus quadrature and Hall
effect inputs from the motor/encoder.
We expect the amplifier to sell for around $199, and the controller around
$49.00, but then again its our first venture above 200V PWM amps so it might
explode in our faces....
Peter Wallace
Mesa Electronics
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