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]>
