Will these Servos work with Rutex

[Fabric8r]

I am trying to retrofit a Bridgeport series 2 manual mill to cnc. I saw these Servos at www.magmotor.com I was wondering if I can use these. If not what do you guys recomend. and where can I buy them.
Thank you, Scott

[Fabric8r]

I forgot to mention what models I was thinking of. When you enter the website Go to Products, Fast connection, Motors, and then I was thinking of the C40, or the B42 Models. you click on the model# at the top of the box.
Thanks, Scott

[peterklos]

Hi I have been using the rutex drives for several years with great results,Setting the PID is a simple proceedure.
I have a very large CNC and I am driving them with motors similar to the C40 , however these motors do not include an encoder which is required to feedback the posistion of the servo motor.
I suggest you purchase a differential type encoder ( not ttl )this eliminates any noise.

Regards Peter ( australia )

[BOB F]

My existing milling cnc machine is 100 volt DC for the servos. If I use a 100 volt Rutex drive then what is the recommended voltage to use. The way I see is that using the same power supply will fault the drive due to back emf when motor is decelerating. Need your recommendation.

[ViperTX]

Fabric8r...have you priced those motors....I just tried their ordering system and it is not working?

[rutexus]

Gentlemen,

I just returned from visiting my newborn granddaughter in PA. I saw enough snow for the year while there too.

So, I'm catching up on some of my emails.

If you use a 100 volt DC power supply with the drives rated 100 volts (R990H) they will not only fault, they will most likely blow.

I would keep your motor power supply between 80-90 volts. This leaves a good 10% margin. Also, be sure not to skimp on filter capacitors. 1000 mfd for each amp is a good guide. I use 24000 mfd for a two axis machine with motors rated six amps continuous, 26 amps peak. I have measured the voltage accross a 1 ohm shunt resistor in series with the motor power wires with my O scope) and the calucalated current often reaches 16 amps momentarily when I am driving the motors hard. Normally these motors are only drawing 4 amps, so you can see that values range widely. I really think I could get away with less capacitance, but I'm not changing my setup. You want capacitors that can obsorb enough fluctuation that they keep the motor power lower than the rated voltage of the drive (100 volts).

Tom Eldredge
Rutex, LLC

[BOB F]

Already requested change of order from R990H to R90H . I hope guys processing my order will get the message in time.

[BOB F]

Hi Tom, Your explanation about capacitance and shunt resistor to monitor amperage is worthwhile expounding in the thread. It could be beneficial to all who are learning electricians.