Re: [CAD_CAM_EDM_DRO] Re: help in selection of servo motor

I am no expert, but...

Voltage constant:
KV 47.36 V/1000 min - would mean that for every 1000 RPM you get/need 47
V(olts).

> n 3000 min - means that your max rpm is 3000 RPM.

At that speed you get/need 3000 x 47 V /1000 == 141 V(olts).

Power:

> Io/In 20.0/ 15.7 A this probably means that Your max continuous amps

are 15.7 A.
I am not sure what the Io/In numbers and the differences are.
I suspect that the motor can input 20.0 Amps and output 15.7 Amps, and
the diffrenece is in heating losses.

Iomax 83.6 A would then be maximum peak (momentary) current.

Going by the continuous torque, 18.0 Nm, and the max rpm 3000 RPM, power
is work produced at a given speed, ie torque (in Nm) x speed (in RPM) =
3000 x 18.0 = 5.65 kW. This is the max continuous power of the motor.

This is a large motor - probably about 30-50 kG in mass, and would be
something you see on large industrial machines.
A VMC, modern machining center, lathe might have this size spindles (or
much bigger).

A:
Yes, You can change out a resolver and put an encoder on the shaft.
Encoders are cheap.

Note:
You will need a large industrial servo drive to use this motor.
If the motor is brushless, you need a brushless servo drive.
The drive will be 1000$s of dollars.

Any industrial supplier will have them - bring money !
I suspect none of the cheap DIY-level solutions will come anywhere close.

You can either try with a NOS drive from someone, which will be risky
and cheap.
Maybe 500-1500$ secondhand or nos.
Or buy a new drive from any industrial supplier, which will work and
cost a lot of money.
You need to specify the use, and motor manufacturer, for the best
results to get a drive matched for the motor.

Whats the motor for ?

Shumaim Shaheer wrote:

>
> Hi All,
>
> With reference to below email. I am still facing problem in
> commissioning the drive. i have following questions.
>
> 1) in existing motor there is a resolver, can i use encoder in place
> of resolver ? or can i use a resolver that is compatible with my drive
> ? bcoz i dont have specs of existing resolver.
>
> 2) can any one recommend me the product. i want the drive with analog
> reference.
>
> Regards
> Shumaim
>
>
> --- In CAD_CAM_EDM_ DRO@yahoogroups. com, Shumaim Shaheer
> <shumaimshaheer@ ...> wrote:
> >
> > Dear All,
> >
> > I have following data of servo motor. could you please help me in
> selecting the drive.
> >
> > Also please tell me how to calculate the voltage , current,
> frequency & Kilo watt from the following data.
> >
> > Mo/Mn 26.0 /18.0 Nm
> >
> > Io/In 20.0/ 15.7 A
> >
> > n 3000 min
> >
> > Iomax 83.6 A
> >
> > R= 0.45 ohm
> >
> > Jr 86.96 kgcm3
> >
> > KV 47.36 V/1000 min
> >
> > Regards
> > Shumaim
> >
> >
>