First projects with Granite Devices driver?


#1

Hi Granite Devices Community. I would like to get started with motor control and have a couple of projects around the shop that I think are appropriate. The first is a drill press with 0.25kW 1 phase induction motor spinning at 1750 rpm that regardless of pulley position ( adjustable between motor and drill shaft ) spins to fast. I have a few alternators lying around that I could re-purpose ( external diodes pack ) with motor control or somebody can advise on suitable replacement motor with Granite Devices driver ? I have 208V ( 60 Hz ) shop power and 24VDC @10 although I’m not adverse to other power supplies. I have PC and PLCs with RS485 and believe that I can program SimpleMotionV2 using such ? Thank you, Nurber


#2

Hi Nurber

Sounds like an interesting project.

If you current spindle turns too fast now, to what rpm are you aiming at?

As the power of a motor is the angular speed * torque, you might want to use higher power motor than the 0.25 kW in order to ensure enough power with the lower speeds.

Kind regards,
Esa


#3

Hi Esa. Thanks for reply. Sorry for the delay in answering. I wouldn’t mind something 200RPM for certain work. Yes, good point as the power rating of included motor is at a speed much greater than what I’m looking for.


#4

Hi

Depending on the highest rpm you need, you could consider a stepper motor with an encoder (to be driven in servo mode), or a torque motor that suits the rpm requirements. The latter are likely to cost somewhat more though.

Kind regards,
Esa


#5

Thanks again. Yes, have read that steppers would be good as long as not driven too fast. Any good online “configurators” for determing appropriate steppers ? Would 500W be a good figure for stepper in trying to match original 250W induction ?


#6

Hi Nurber

The motor selection is highly application specific.

As the motor output are low when the rpm’s are lowe, I would approximate the required torque that you really need for the low speeds and select the replacement motor accordingly.

Kind regards,
Esa