My comment was specifically referring to the input side of the PLCs where power in is standard AC.
As far as the frequency components present on the PWM side, it depends on the risetime of the pulse. The PWM signal from the PLC is most likely a squarewave, but at a relatively modest frequency (a few KHz). so depending on its risetime, it may indeed have some reasonable level of power in the harmonics. But ultimately, you cannot have more power in all the frequency components on the PWM side than is coming in on the AC side. -m From: Joe Catania [mailto:[email protected]] Sent: Tuesday, September 20, 2011 5:58 AM To: [email protected] Subject: Re: [Vo]:Debunking Steorn Orbo Pulses cause significant skin effect because their Fourier components consist of high frequency harmonics. ----- Original Message ----- From: Mark Iverson-ZeroPoint <mailto:[email protected]> To: [email protected] Sent: Monday, September 19, 2011 11:08 PM Subject: RE: [Vo]:Debunking Steorn Orbo From: Robert Leguillon [mailto:[email protected]] Subject: RE: [Vo]:Debunking Steorn Orbo [deleted] Thus the original question set: Q1) Does this uneven current flow (skin effect) translate to potentially uneven heating - even at equilibrium**? [deleted] R.L. -------------------- >From everything that I've read and experienced, the skin effect doesn't become significant until you are well into the kilohertz frequencies; certainly above Mhz. At the 50 or 60 Hz that is all modern AC power, I highly doubt that ANY skin effect is happening. -Mark
