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Roger wrote:
On Wed, 21 Dec 2005 14:29:00 GMT, Matt Whiting wrote: George Ghio wrote: Tell us why anyone would modify a sine wave. To vary the power delivered to a load. Chopping off part of a sine wave cycle is a standard means of power control. That makes three phase SCR (Silicon controlled rectifiers and not saturable core reactors) interesting as chopping off part of the wave form develops spikes and harmonics that tend to make the control of one phase interact with the others. I've built a lot of them for single phase control, but I never once was able to build one for three phase that didn't interact. Turn one up and maybe another would go up, Turn the second down and the other two might go up or down. Twas interesting:-)) which is probably why Saturable core reactors are so popular in industry. Now there is a controller that is a tad on the weighty side. The application I'm familiar with (well I was 10 years ago) was electrically fired glass melting units. The resistive load didn't much care about cross phase interference. :-) Matt |
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