Re: access to Ametek motors- suitable for Servo application?

Thanks for the pointers so far.
I did get this extra info about one of the motors, the 50V one:

Ohms: 0.839
Shaft Diameter: 1/2"
Weight: 11Lb
Length: 7"
Volt: 50 VDC
Amps: 1

The 1 Amp rating makes me question it significantly.

I was told that the thnig will spin about 1800RPM at 48VDC, and
500RPM at 12VDC. I have no idea if this is even remotely correct or
not.. They also mentioned that the motors had offset brushes and were
designed to run optimumly in one direction over the other.???

Again, any insite is welcome.
Thanks.

> Well, this just isn't enough info. Given the RPM at X Volts, that

gives you

> a lot more to work with. Otherwise, I can't tell anything else

about these

> motors.
>
> The standard Ametek motor that lots of people use (36 V @ 900 RPM)

have

> pretty high armature resistance. I'd suspect that any other motor

they

> make in
> the same frame would be wound the same way. it seems that these

motors

> don't allow a Gecko drive to reach its proper performance in terms

of DC

> gain. In other words, you can take the shaft of the motor and move

it maybe

> 10 - 15 degrees with VERY little resistance, then the Gecko starts

pumping

> current through it and it resists the deflection. I haven't gotten

any

> explanation
> from Mariss as to why it behaves like that, it isn't supposed to!

My own

> servo drives get very stiff, and reach full current with a

deflection of

> .001"
> or so, which is a small fraction of a degree. I am assuming that

either

> the inductance
> or series resistance of these motors prevent the I term of the PID
> control loop
> from working properly. And, it appears, although I haven't tested

it,

> that this
> may only apply to the Ametek motors. I've had several people

report similar

> behavior with Ameteks, and no other motors.
>
> >Anyone have any experience with anything like these? Are these
> >anything like the "other" Ametek servo motors available around?
> >
> >
> Yes, I think they are the same frame, just with different windings.
> They can
> change the number of turns/coil and the wire gauge to set the

volts/RPM

> where the customer needs it.
>
> Jon