On 4/25/23 09:27, Thaddeus Waldner wrote:
What I mean is that specific driver would not fit into my space. I am currently
using a custom 24v BLDC driver that I built. But the only option for power
supply at this point is a wall wart that is about twice the size of your
typical laptop charger, which I’d like to eliminate.
I'm with Todd, confused.
The psu for such a motor all by itself would be smaller than the psu for
the typical 3d printer, but that is still going to be bigger than the
driver, which for one of the motors I'm thinking of needs a length of
118mm, a depth from mount face to terminals of 86mm, and thickness of
34mm, part of which is heat sink it does not need unless working really
hard.
These new drivers can function with up to 90 volts, delivering 5 to 6
amps into the motor, dependent on the detected error. Motor current is
not fixed, but varies with the detected error so the motor normally runs
dead cool, much more energy efficient than std 2 phase steppers. This is
the power that spins the electrical meter determining your monthly power
bill. The error, if only 1 count between the step-gen count and the
encoder, feeds less than an amp to the motor, 2 count error, maybe an
amp, 10 counts, 4 amps. This is micron accuracy in most direct drive
situations. Their speed limit is more likely to be determined by the
speed of the opto-isolators in the drive input circuitry. Testing these
motors just laying on the table with no load, I've run them with a
function generator at 375 kilohertz! At a /8 microstep, that's over 3000
revs at 24 volts. At 90 volts, it might be possible to hit the 5000 revs
and still have usable torque to turn the load.
It might take another box to contain the psu and driver, but I think the
motor itself is capable to doing the job. Wired into hal correctly, a 5
micron error will stop linuxcnc in a millisecond. Tested, works, but has
yet to occur doing a job. Currently the driver costs more than the
motor, but I suspect that will equalize and lower once the NRE costs
have been recovered, say about a year from now.
Bleeding edge tech usually has a bleeding edge price... TANSTAAFL.
On Apr 25, 2023, at 7:00 AM, Todd Zuercher <to...@pgrahamdunn.com> wrote:
I'm a little confused, a BLDC motor is still going to need a drive/driver,
weather or not it runs at line voltage, that you say you don't have space for.
How is that going to help you?
Todd Zuercher
P. Graham Dunn Inc.
630 Henry Street
Dalton, Ohio 44618
Phone: (330)828-2105ext. 2031
-----Original Message-----
From: Thaddeus Waldner <thadw...@gmail.com>
Sent: Monday, April 24, 2023 5:40 PM
To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net>
Subject: [Emc-users] Medium voltage BLDC motor
[EXTERNAL EMAIL] Be sure links are safe.
HI,
I have an application where I need a NEMA 23-size 80-120 watt brushless DC
motor. The machine housing doesn't have space for a 100w DC 24v power supply,
so I would like to use a controller and motor that runs at line voltage.
Does anyone know of a small BLDC/PMAC/Synchronous AC motor that is designed to
run at about 150v coil voltage?
Motors this size/voltage are apparently quite common in kitchen appliances that
use pumps or fans, but I cannot seem to find a plain motor with output shaft.
Thanks,
Thaddeus Waldner
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Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>
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