Power Supply Design

Hi Everybody,

I need to design a power supply for a DC Motor: 90 VDC, 17A

The idea was to use a transformer to function as safety isolation. I have not found the required transformers to do so (If you can point me to some, I would appreciate, thanks).

Now I am looking into transformerless power supply, it seems they cannot be designed for high current.

How can I design a transformerless power supply with VDC output between [70V 90V] and the current between [12A 17A]?

Use an isolation transformer, whatever you do. Is there an Arduino question here, somewhere?

Paul

Is it a 90V motor? Most of those are AC motors that run on half wave AC. Top half spins motor in one direction, bottom half spins the other direction.

That's a pretty powerful motor. Is there some reason why it has to be DC and has to be 90V? You could probably find a different motor with the same power that just plugs in to the wall.

Leoshell: How can I design a transformerless power supply with VDC output between [70V 90V] and the current between [12A 17A]?

By becoming an experienced power electronics engineer? That's quite a task if not, we are talking > 1kW power levels.

Or finding one to buy

Or building a transformer supply (1.5kVA toroidal transformer is not impossible to source).

Nothing will be cheap, that goes without saying, if you have AC power an AC motor is obviously an easier choice.

Thanks everybody and sorry for the late reply.

It is a DC motor from a treadmill, and I will control it with a microcontroller.

OK, that explains a lot. A treadmill needs pretty good speed regulation so DC 1KW seems reasonable.

But you say "from a treadmill"? What is it going to be used for?