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I'm fairly new to the list, and this is my 1st question, so please
excuse me if I don't get the protocol just right, but I feel that this
group would likely have some useful input, and I just need some help.
I'm the 'digital' guy here, but some responsibilites overlap.
    We need to control a capacitive run, synchronous motor. I think this
is also called split phase. Since our industry is the oilfield, and our
business is exploration equipment, we have some non typical
requirements. The parameters (read:problems) are this:
1...This motor runs on about 600VAC, 1.25 to 2 A max.
2...This motor is at the end of a 25000 foot wireline. (about 5 miles)
3...Being split phase, there seem to be some problems using PWM control

    What has been done in the past involves the 'brute force' technique.
We connect the primaries of 2 SU-1 transformers to a variable
transformer. While this works, we need to convert to electronic control,
so that we can monitor the motor RPM, and adjust for optimum efficiency,
using a MCU.

    By now you have figured out that controlling 2KW of AC is not what I
do. If I have left out some pertinent specs., please let me know.

    Thanks,
    John Marshall



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