Great Service! Now need power help.

[tintruder]

It has only been a week or so since I discovered the Rutex drives can run the Sanyo Denki P5 motors I bought. Been wondering what I was going to do with the darn things as so few sinusoidal drives with Step-Dir inputs are available at any price. My thanks to whoever it was who pointed me here.

In that time, I've fired off a bunch of emails to the fine folks at Rutex, and even without spending a dime, I received quick, informative replies and even a couple surprise phone calls!

Well, this morning I finally took the plunge and ordered 3 drives and a chassis and can't wait for them to arrive. Of course, I still have to buy the mill....always some niggling detail to spoil my fun!

Great job guys...I like the service and support you offer! As I said, it was a big commitment from somebody used to the HobbyCNC Driver and $20 stepper end of the CNC world, but you made it easy.

Now for the REAL reason for this post......

The drives and the brakes on the motor will require a 24vdc power supply...this is no problem. I can build one easily.

The motors themselves will need 80vdc though, and I'm not quite sure how to get there in the safest, electrically smoothest and most economically sound way.
Does anybody have designs or suggestions for a power supply in this range? Or do I just build a couple 36v supplies and hook them in series? Do I use torroid transformers or regular iron core? What's the difference?

Any advice on the 80volt power supply design parts sourcing etc. would be appreciated!

Tom

[KTP]

I am running my P5's off of wall AC (rectified and filtered inside of my drive)...why are you limiting them to 80VDC?

[tintruder]

Why?

Well, the guys at Rutex said not to run the drives to the limit. That 80v was a good level to set.
Beyond that, I don't know...that's why I'm asking. I'm completely new to servo systems and unfamiliar with the various options for powering at those levels.

Please describe your configuration and what components are involved.

Tom

[KTP]

Ah! Sorry, I thought the Rutex drive worked to 200V at 40 amps, but now I see that is the 2020 *brush* drive, not the 2030 brushless drive you are using. Please ignore my suggestion to run the motors higher than 80V

My system would not apply, as I am using a reliance BDC25L brushless drive that takes a standard wall plug (like on the back of your computer) to 115VAC. Inside the drive it is fused, rectified and filtered, and the drive controls are opto-isolated from this rather dangerous non-isolated rectified AC. I believe the BDC25L is rated to 180VDC, which is good, since rectified 115V AC is NOT 115V DC

Perhaps it is a bit much voltage for the Sanyo P5, but I don't think it is too bad...they certainly run strong...I think they could rotate the earth if I could anchor them to something with more mass

They will run great at 80VDC too I am sure.