I have some brushless servos that I am trying to find some drives for.
I want to use them with Linuxcnc and I don't have any other hardware to
go with them (yet).
They are old ElectroCraft servos.
XBR-2910 (part# 1834629030) Specs:
Torque Constant (Kt) : 1.8 in-lbs/ amp
Voltage Constant (
Looking on eBay at similar motors, there seems to be an awful lot of
wires on the encoder connector. Have you any idea what sort of encoder
it is?
There are enough wires for it to be an absolute encoder, I think. Or
it could just be power and differential encoder + halls (14 wires,
maybe 16 with se
On Thu, Jul 12, 2012 at 11:07 AM, andy pugh wrote:
> Looking on eBay at similar motors, there seems to be an awful lot of
> wires on the encoder connector. Have you any idea what sort of encoder
> it is?
>
I couldn't find one of those motors, and I'm not familiar with that series,
but typically t
Todd Zuercher wrote:
>
> Is there enough of an advantage to sinusoidal commutation to justify the
> added expense of a sinusoidal drive, or is an inexpensive trapezoidal
> drive good enough?
>
The older the motor, the more likely they are wound SPECIFICALLY for
trapezoidal drive. Some newer mot
There are 15 wires in the encoder cable plug:
Shielding
+Vcc Data (5volt)
GND Data
S1 (Hall Signals on the encoder)
S2
S3
+Vcc COMM (5volt)
GND COMM
CH A (Differential encoders)
CH A-
CH B
CH B-
Index
Index-
TC1 (these two go to the a temp sensor in the motor)
TC2
--
P. Graham Dunn
Phone:
On 12 July 2012 17:31, Todd Zuercher wrote:
>
> There are 15 wires in the encoder cable plug:
> Shielding
> +Vcc Data (5volt)
> GND Data
> S1 (Hall Signals on the encoder)
> S2
> S3
> +Vcc COMM (5volt)
> GND COMM
> CH A (Differential encoders)
> CH A-
> CH B
> CH B-
> Index
> Index-
> TC1 (thes
s.com]
Sent: Thursday, July 12, 2012 12:10 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Drive Recomendations?
Todd Zuercher wrote:
>
> Is there enough of an advantage to sinusoidal commutation to justify
the
> added expense of a sinusoidal drive, or is an inexpensi
On Thu, Jul 12, 2012 at 1:19 PM, Todd Zuercher wrote:
> Is there a Way to tell if a motor is trapezoidal wound?
>
If it has halls on one connector and an encoder added, it probably is
trapezoidal. If it just has halls, it definitely is trapezoidal. Most of
the higher-end servo motors are wound f
Todd Zuercher wrote:
> There are 15 wires in the encoder cable plug:
> Shielding
> +Vcc Data (5volt)
> GND Data
> S1 (Hall Signals on the encoder)
> S2
> S3
> +Vcc COMM (5volt)
> GND COMM
> CH A (Differential encoders)
> CH A-
> CH B
> CH B-
> Index
> Index-
> TC1 (these two go to the a temp sen
andy pugh wrote:
> In that case the motors will work nicely with almost any conventional
> drive including the Pico one. http://www.pico-systems.com/acservo.html
> It will also work with the 8i20, but that needs a Mesa interface card
> (whereas I think the Pico drive will work with any PWM source,
Todd Zuercher wrote:
> Is there a Way to tell if a motor is trapezoidal wound?
>
In theory, if you spun it at a constant rate and observed the waveform on
an oscilloscope, it would be non-sinusoidal. But, I've never been able
to tell the difference.
> Besides trying it both ways and seeing whi
On Thursday 12 July 2012 22:28:46 Jon Elson did opine:
> Todd Zuercher wrote:
> > Is there a Way to tell if a motor is trapezoidal wound?
>
> In theory, if you spun it at a constant rate and observed the waveform
> on an oscilloscope, it would be non-sinusoidal. But, I've never been
> able to te
Gene Heskett wrote:
> With a big enough flywheel to assure a pretty constant angular velocity in
> the presence of the motors natural cogging tendency, I still don't think
> the diffs would be all that visible on the scope.
These brushless SERVO motors have VERY little cogging. I have some
slot
On Thu, 12 Jul 2012 10:37:06 -0400
"Todd Zuercher" wrote:
> Or a Mesa 8i20 but then I have to buy or build a power supply.
I have a power supply PCB that mounts above the 8i20 already designed.
I have enough in the field at this point to be confident that they
work. I'm out of PCBs at the momen
On Thu, 12 Jul 2012 10:37:06 -0400
"Todd Zuercher" wrote:
> Or a Mesa 8i20 but then I have to buy or build a power supply.
I just read more of the thread... If you're not using Mesa hardware for
the rest of your system, you may be better off with Pico Systems
drives. Two reasons:
1. Your motor
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