ON THE FENCE

[MSGMachine]

I am updating the control on my Milltronics Partner 36 x 9 knee mill.
My motors are an SEM MT30f4-25 http://www.sem.co.uk/fileadmin/data/...ata_Manual.pdf
These motors are using 2:1 pulleys on the x and y axis.
I want to use the Dugong or the Whale3 drive.
What I am on the fence about is, I am only looking for no more than 120ipm from my machine. which (if I have calculated right with a .200 lead screw) is 1200 rpm on the motor which at 40rpm/volt, is 30volts to the motor.

1. So my question is, how much power supply voltage do I need? or does the drive need more voltage, do to some voodoo in the PID or something that I don't understand?

2. If I have less voltage will the motor want more amps?

3. Which brings me to which drive to buy.

Thanks,
Not an EE

[mike_Kilroy]

actually that motor needs about 23v per 1000rpm, so 25-6v for 1200rpm.... the Kv can be +/-10% so might be as high as 29v just to spin - leaves no volts to make torque.

so it iwll be pretty whimpy at 1200rpm.

volts makes speed generally, current makes torque exactly. so no matter what you do with the voltage, the current will be the required torque times the Kt constant - voltage has no effect on it - unless you dont have enugh to make the current thru the 1 ohm resistance.....

bottom line: get close to 100v to be happy. 80 prob ok. 30 and you will be unhappy I think,

[Al_The_Man]

Why not use the existing supply? And use drives such as Larken Viper?
Presuming you are using step/dir controller.
There are other drives with alternate drive methods if not using S/D.
Al.