On 02.03.19 13:18, Roland Jollivet wrote:
> I have come across a number of 24VAC traction motors from BT pallet
> lifters. About 4kW
>
> They use a controller that runs off a canBus. There is no encoder on the
> motor.
> These are not Servo drives as such, but can drive the motor in voltage or
> torque mode.
>
> Is it practical to try and use these as servos?
> Mount an encoder on the motor and LCNC completes the servo loop?
>
> http://imgbox.com/rDGX1ayn
> http://imgbox.com/cNEavmIg
The second image seems to show connections for two of the three phases
and one of the DC connections to a powered rotor. That spells
synchronous motor to me. If that's so, wouldn't a BLDC drive make such
a motor into a servo, given feedback and the ability to drive a
non-rotating field for stopping?
> It sounds like a lot of work to me.
Maybe an experimental lash up, perhaps with feedback taken off with a
toothed belt, could show whether it's worth investing further effort.
After all, to use the motors for anything, adequate mounting is needed.
Erik
P.S. No titillating pictures seen here, just motors. No time for dalliances
either. Have to shoot back out to the farm to make sure the plumber
puts pipes in the right places before the slab is poured, and want
to see the top and bottom steel go in too. (Mill & lathe are only
3/4 tonne each, but still.) But now there's a couple of fires, one
30 km away has grown to 4500 Ha (11000 acres) since yesterday, and
nearer folk are evacuating now. One highway out to the farm is closed
and the other reserved for firetrucks and essential services. The
train's stopped too. A stretch of 37°C days and long-term lack of
rain are making for a poor start to autumn. (The last of our dams
with water is down to the the size of an inflatable paddling pool.
Never seen before in the 53 years we've been there.)
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