Hello!

I would like to control the power of a three phase Linear Induction Motor (LIM) with phase angle control. At my hands I have a couple of SSRs (Solid State Relay) and a microprocessor. I get a trig to the CPU when the first phase crosses zero.

Now the only (?) thing I need is the math and/or tables to calculate the needed firing angles to supply the whished power to the LIM. With a single phase this would be rather simple, but three phases drive me mad.

I have made an extensive search on the net without finding anything but finnished products. Seems hard to come by material about needed algorithms and example control programs.

Would be great if anyone could provide some useful info!

Best regards, Johan Englund