Paul and Sabrina's Cheap 3 Phase Inverter (AC Controller) with Field Oriented Control

[Daox]

Originally Posted by sawickm

I would be willing to donate to the cause, give me a list and count of the parts you need to get started.

Thats a good idea. It helped get the first controller off the ground a little faster. Ben, do you still have that link to donate to Paul setup on your site?

[jackbauer]

Ok my 2 cents. Small drives are cheap. Whey not look at doing what that guy with the ford siemens motor did and use the control bits from a small drive scaled up with a larger power section.

[Janis]

Originally Posted by MPaulHolmes

4) U.S. Digital encoder, model E3-500-500-IHT. I don't know where to get this. Maybe I'll get a different one.

For start I think you don' t need it because first you will want to run AC motor simple open loop V/Hz method then sensorless Vector control and only then closed loop with sensor (a lot great fun of PID tunning). Not much hardware difference just you have or you don't sensor

It is standard quadrature incremental encoder 500 lines per revolution, 5V supply can be found here:
US Digital | Products » E5 Optical Kit Encoder
Here others from Farnell:
Farnell Export

Yes they are expensive and must search hard to find cheap one

[MPaulHolmes]

I am doing what someone else did! hehehe. The software is largely done by Microchip. It will at least give me a really really good head start. I've even compiled it in MPLab. So I have the hex file, I'm just waiting to order the PICKIT2 or PICKIT3, and a few other things. And the software has been tested and tuned for a 1/3 HP LEESON motor. It's application note AN908.

I don't think the control section will be very complicated as long as I'm using an integrated driver board/ power section module, which I am. hehe. They even have IGBT 6pacs that go up to 600amp. A 3 phase bridge with drivers and everything in one piece. Just add ripple capacitors. That's not the cheapest way to go, but certainly the easiest.

[Janis]

What about dedicated DSP for AC motor control, like:
http://www.freescale.com/files/micro...=Documentation
or
http://www.analog.com/static/importe...ts/ADMC326.pdf

?

[MPaulHolmes]

For me the field oriented control is a must. Fran is helping me out with this, and he uses it in EV PMSM motor control with great success (also with making giant electric mine blower upper machines).

[Christ]

This will be great for the day I get around to converting a few alternators to motors.

[MPaulHolmes]

sawickm bought a PICKIT3 so I can program that dang PIC microcontroller! Thank you!!!!! I think I'll start out with V/Hz = CONSTANT approach to control, and then add the field oriented control. AFter that, I'm going to try sensorless field oriented control. It's a new area of research right now, and there are some pretty good research papers coming out of some universities in Asia mostly about it that give results that are as good as using a resolver/encoder. I have been reading about how the AC induction motor works, and I keep working on understanding the park and clarke transformations and inverse transforms so I can get a good feel for what's going on.

[sawickm]

Hi Paul,

As soon as I receive the PICKIT3, I'll send it out to you.

- Mark

Originally Posted by MPaulHolmes

sawickm bought a PICKIT3 so I can program that dang PIC microcontroller! Thank you!!!!!

[MPaulHolmes]

Pickit.... lickit..... flickit!