cycle chopping for AC motor

How, exactly, do you plan to "chop" 10Hz from the source? What kind of motor is it? What's your application?

Don Lancaster has a VFD for sale on ebay:

He says it's a 3phase output, but if he's got the part number right (160S-AA02NPS1P1), this one's a single phase, which is what you need: For under 70 bucks, you can't beat that with a stick.

I 'm not sure about this concept ,whether it will get through or not.... i plan to do it with a thyrister with microcontroller based gate triggering.....

What do you think of it? Will there be any problem for the motor? i tried it , but the motor temp shoot up beyond the limit.... will it be possible to controll the temp rise...?

Pls send ur comment....

Its an AC motor with cap start

----------------- And you are pumping out a lot of harmonics which will cause problems such as high core losses and also some negative torque production. A mess. Filtering to smooth the waveform will help.

The problem is that you are not really fundamentally changing the frequency, you are eliminating some pulses in a series of cycles, i.e.

10 out of 60. What you are left with then is discontinuous power to the motor, not really a different frequency. That doesn't mean it won't work however. What you are thinking of doing has already been done for years, It's called a "cycloconverter" and was used as an earlier version of a variable speed drive for AC motors. Google it.

As Don Kelly mentions however, it comes with more problems than it solves for the most part. Applying it to a 1 phase motor with capacitors would be a disaster.