What about those cute but useless SOLAR MOTORS. Haven't seen one for awhile but thought one dose not need much power but motion to keep things flowing.
Just by two cents ... (hey if some on says ... a penny for your thought and you give them your 2 cents worth ... where does the other penny go ? Ed Kasper L.Ac., Acupuncturist & Medicinal Herbalist Santa Cruz, California & www.happyherbalist.com e-mail [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] Sent: Saturday, June 09, 2001 12:31 PM To: [email protected] Subject: CS>Re: silver-digest Digest V101 #556; att'n Ole Bob, others re motor controller Hi from Joe: Bob - placed an order, due in a wk; thanks for the tip, sounds like what I need. They said $3.50 @. [800 826 5432]. If you don't have an AC PWM controller already, their cost is way more than the EM-114 sol'n. Re operation from 115 Vac - all modern drill motors, etc. are run by pulse width modulation of the line current, up to about 90% of the positive wave & for ac motors both + & - peaks. They rely on the motor inductance to smooth the current between on time gaps. You'll hear & feel buzzing at low speeds w a drill motor because the gap between pulses is large. Torque is way down too, it's why the PWM process works as a speed control. Don't need frequency change [for small loads like this; I've dealt w them before & the entry fee starts at about $500, WON'T work w permanent magnet motors]. Re 6 Vdc supply - you'll find it hard to locate 1 w a current rating of 1 amp; use of less will kill it in a while [there's no internal protection for overloads & is the most common death cause]. Besides, that exceeds the motor rating by x 2 - 4 & has no current control, so will cook the motor [if it survives that long]. Can't use a zener diode to drop the supply voltage unless it has a power rating of at least 1 W / volt dropped which puts it out of reach [an industrial application]. Ex. - if you have a strong 6 Vdc supply & need 2 V to the motor, you would need 8 zeners in parallel to get the 2 V w/o killing them [at 1/2 W each]. Guess it's feasible but it's not 'sanitary'. Re train transformers - will need a rectifier diode to make this permanent magnet motor run; 2 1N4000 in parallel should get the power rating to handle the continuous motor I. See? Bob's sol'n is pretty nice. Best I've seen. Bye. -- The silver-list is a moderated forum for discussion of colloidal silver. To join or quit silver-list or silver-digest send an e-mail message to: [email protected] -or- [email protected] with the word subscribe or unsubscribe in the SUBJECT line. To post, address your message to: [email protected] Silver-list archive: http://escribe.com/health/thesilverlist/index.html List maintainer: Mike Devour <[email protected]>
