On Thu, 12 Jan 2012, Viesturs L?cis wrote:
Date: Thu, 12 Jan 2012 21:49:16 +0200
From: "[UTF-8] Viesturs L?cis" <viesturs.la...@gmail.com>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Subject: Re: [Emc-users] Servo drive?
2012/1/12 andy pugh <bodge...@gmail.com>:
On 12 January 2012 18:14, Viesturs L??cis <viesturs.la...@gmail.com> wrote:
I was meaning a 12 to 12 (or 12 to 15) one, like
http://uk.rs-online.com/web/p/dc-dc-converters/6727408/
That gives the IRAMS board an isolated 15V supply,
Thanks for the link!
I have a feeling that that might not have a large enough current
capacity, though. I just found my proto circuit, and it has a
transformer on it, and I probably did that for a reason.
The manual says:
Quiscent VCC supply current: typical = 1.6, max = 2.3 mA
Quiesent means inactive (I would expect 60 - 100 MA at 20 KHz gate drive)
Do I understand that this is how much current does logics consume with 15VDC?
In that case one for each chip should be totally fine, because that
dc-dc converter has 200 mA output.
Oh yes, I really would like to do that.
Unfortunately I do not have much of a choice to get those motors
running. So it is just one more case, where I will have to learn
things the hard way.
With large capacitors at 300VDC the hard way can be very hard indeed.
You might not get the chance to learn from mistakes.
Do You mean risk of high voltage and even higher power electrical shock here?
Re your question about a 1:1 transformer, I think you probably want a
2:1 anyway, as rectified mains will give you >300V and your motors are
specced for 160V.
Am I missing something? Where do You see 160V?
Here is motor data (from the first email of this thread):
Motor type: T3-0130-60-560
Winding number: 01-00111
Rated Speed: 6000 min^-1
DC Bus Voltage: 560 V
Nominal AC Voltage: 330 V
Rated Motor Voltage: 309 V
Rated Torque: 1,00 Nm
Rated AC Current: 1,40 A
Stall Torque: 1,30 Nm
Stall AC Current: 1,67 A
Peak Torque: 5,2 Nm
Peak Current: 7,2 A
Max. Speed: 12000 min^-1
EMF Constant: 47,0 V/1000
Torque Constant: 0,78 Nm/A
Terminal Resistance: 12,7 ??
Terminal Inductance: 21,5 mH
Number of poles: 6
El. Time Constant: 1,7 ms
Mech. Time Constant: 2,4 ms
Thermal Time Constant: 30 min
Rotor Inertia: 0,65 kg*cm^2
If motors were meant for 160V, I would already had purchased
GraniteDevices drives weeks ago...
Viesturs
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Mesa Electronics
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