On Thu, 2011-12-29 at 21:14 -0500, gene heskett wrote:
pointers to the articles
That was a series on transformers triac triggering, with a resistance
soldering setup as the McGuffin. CC doesn't put articles online (if you
know where to look, go for April/June/August 2008), but I put up some
On Friday, December 30, 2011 01:42:36 PM Ed Nisley did opine:
On Thu, 2011-12-29 at 21:14 -0500, gene heskett wrote:
pointers to the articles
That was a series on transformers triac triggering, with a resistance
soldering setup as the McGuffin. CC doesn't put articles online (if you
know
Ed, do you know how stable the voltage remains across a range of loads from
open to dead short? Curbside microwaves and some heavy gauge wire sounds a
whole lot cheaper than commercially produced transformers. 1KW at 13.5V
+/- 1.5V could come in handy, but not handy enough for my budget to
On Fri, 2011-12-30 at 16:33 -0500, Jim Coleman wrote:
how stable the voltage remains across a range of loads
I really didn't measure that, but I think the core losses are just this
side of terrible. After all, they used core saturation for output power
control, so reducing losses probably wasn't
On Thu, 29 Dec 2011, gene heskett wrote:
On Thursday, December 29, 2011 09:05:54 AM kqt4a...@gmail.com did opine:
Just in case y'all run out of something to ponder
I do not have one of those fancy meters Gene mentioned but I do have a
Kill-A-Watt
118.7 volts ac
3 motors at rest - 1.15
On Thu, 29 Dec 2011, gene heskett wrote:
On Thursday, December 29, 2011 10:08:23 AM kqt4a...@gmail.com did opine:
On Thu, 29 Dec 2011, gene heskett wrote:
On Thursday, December 29, 2011 09:05:54 AM kqt4a...@gmail.com did
opine:
Just in case y'all run out of something to ponder
I do not
On Thursday, December 29, 2011 09:13:26 AM Ed Nisley did opine:
On Wed, 2011-12-28 at 12:03 -0500, gene heskett wrote:
There are hall effect based ammeters
A while back, I mooched a Tek Hall-effect current probe from my buddy
Eks to take some interesting pix:
On Thursday, December 29, 2011 10:08:23 AM kqt4a...@gmail.com did opine:
On Thu, 29 Dec 2011, gene heskett wrote:
On Thursday, December 29, 2011 09:05:54 AM kqt4a...@gmail.com did
opine:
Just in case y'all run out of something to ponder
I do not have one of those fancy meters Gene
On Thursday, December 29, 2011 01:10:20 PM kqt4a...@gmail.com did opine:
On Thu, 29 Dec 2011, gene heskett wrote:
On Thursday, December 29, 2011 10:08:23 AM kqt4a...@gmail.com did
opine:
On Thu, 29 Dec 2011, gene heskett wrote:
On Thursday, December 29, 2011 09:05:54 AM kqt4a...@gmail.com
On Wed, 2011-12-28 at 12:03 -0500, gene heskett wrote:
There are hall effect based ammeters
A while back, I mooched a Tek Hall-effect current probe from my buddy
Eks to take some interesting pix:
http://softsolder.com/2011/06/20/stepper-sync-wheel-current-waveform-first-light/
kqt4a...@gmail.com wrote:
Just in case y'all run out of something to ponder
I do not have one of those fancy meters Gene mentioned but I do have a
Kill-A-Watt
118.7 volts ac
3 motors at rest - 1.15 amps
3 motors running - 1.6 amps
4 motors at rest - 1.43 amps
4 motors running - 1.85 amps
Just in case y'all run out of something to ponder
I do not have one of those fancy meters Gene mentioned but I do have a
Kill-A-Watt
118.7 volts ac
3 motors at rest - 1.15 amps
3 motors running - 1.6 amps
4 motors at rest - 1.43 amps
4 motors running - 1.85 amps
This is killing my electric bill
On Thursday, December 29, 2011 09:05:54 AM kqt4a...@gmail.com did opine:
Just in case y'all run out of something to ponder
I do not have one of those fancy meters Gene mentioned but I do have a
Kill-A-Watt
118.7 volts ac
3 motors at rest - 1.15 amps
3 motors running - 1.6 amps
4 motors
Gene, was it you I read about building edm power supply from re-wound
microwave oven transformers? Or was it somebody else who was into the edm
discussion a couple/few years back?
On Dec 29, 2011 1:36 PM, gene heskett ghesk...@wdtv.com wrote:
On Thursday, December 29, 2011 01:10:20 PM
On Thursday, December 29, 2011 09:01:51 PM Jim Coleman did opine:
Gene, was it you I read about building edm power supply from re-wound
microwave oven transformers? Or was it somebody else who was into the
edm discussion a couple/few years back?
Nope, 'twasn't me. It was probably Ed
I assume all my steppers are using all the amps I want them to, which
would be 12A if I was using 4 steppers at 3A ea.
But probotix is probably assuming some reduction in current while
stationary this can lead to loss of position when powered down to a
lower current (it may be a requirement if
On 28 Dec 2011, at 15:52, kqt4a...@gmail.com wrote:
Would someone elaborate on this just a bit
I am not questioning their response I just do not understand it
I suspect that the 60% might be a diversity factor.
www.wikipedia.org/wiki/Diversity_factor
On Wednesday, December 28, 2011 11:21:24 AM kqt4a...@gmail.com did opine:
I have a 40v 10amp power supply from Probotix
I asked this question of supp...@probotix.com
I have used your 40 volt 10 amp power supply for over a year with 3 of
your yellow motors (3 ammps each) I just added a 4th
chopped 3A means 3A AVERAGE the peak is much higher
Dave Caroline
--
Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex
infrastructure or vast IT resources to deliver seamless, secure access to
2011/12/28 kqt4a...@gmail.com:
I got this response
The 40V 10Amp power supply is more than capable of handling all 4 drivers
running the 3 amp motors. The formula breaks down like this: 3A x 4 x 60% =
7.2 amps
This would be what your draw would be on the power supply.
Would someone
On Wednesday, December 28, 2011 12:05:13 PM Dave Caroline did opine:
I assume all my steppers are using all the amps I want them to, which
would be 12A if I was using 4 steppers at 3A ea.
Not so Dave. For modern chopper stabilized current controlling drivers,
the power supply is only
On Wednesday, December 28, 2011 12:20:36 PM Andy Pugh did opine:
On 28 Dec 2011, at 15:52, kqt4a...@gmail.com wrote:
Would someone elaborate on this just a bit
I am not questioning their response I just do not understand it
I suspect that the 60% might be a diversity factor.
The reason they state 67% is because they are not getting the full
torque from the motor
They are not fully powering both windings and there is an assumption that
the motors are not all in the same phase so some windings are partially powered.
for full step and full power you power both windings
Well I guess if y'all are going to explain it like that then even I can
understand it :)
Thanks
Richard
--
Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex
infrastructure or vast IT resources to
Stallings
PMDX
-Original Message-
From: Dave Caroline [mailto:dave.thearchiv...@gmail.com]
Sent: Wednesday, December 28, 2011 1:27 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] stepper power supply
The reason they state 67% is because they are not getting
On Wednesday, December 28, 2011 10:10:54 PM Steve Stallings did opine:
Sorry, but a different opinion here
Gecko publishes the 67% number based on
real world experience with a large number
of motors and power supplies tested.
The reality of calculating the current
needed is
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