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07-06-2011, 08:50 PM | #81 |
I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
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While I'm no expert, there is the possibility that a "dual voltage rated AC motor" has more going on inside. Thus the changes per my link. I'm NOT argueing, just stating. Manning, it's cool.....just bringing different views to this discussion. JRH, same for you. |
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07-06-2011, 09:56 PM | #82 |
I wanna be Dave Join Date: Apr 2007 Location: Arlington, Washington
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Big Jim always told me to ignore most AC motor theory when it came to our motors.....while some stuff is similar, the way they work is a totally different animal. Basically the way it was always explained to me was that when you increase voltage, you increase amp draw if all else is the same. Basically additional voltage creates additional RPM...more RPM requires more power, etc.... There is an easy old test to this.....6 cell 1/12th scale vs 4 cell 1/12th scale....same everything, even gearing......you will never make run time with the 6 cell on some tracks, while you can with ease on 4 cell.......there was a reason 6 cell mod 1/12th scale died out and it all went 4 cell...... I plan to work on the test leads tomorrow if I have all the stuff, but don't hold yer breath....orders come first. Later EddieO |
07-06-2011, 10:05 PM | #83 | |
RCC Addict Join Date: Jul 2009 Location: reelsville
Posts: 1,871
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07-06-2011, 10:22 PM | #84 |
I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
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07-06-2011, 10:39 PM | #85 | |
RCC Addict Join Date: Jul 2009 Location: reelsville
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I've only had two years experience with three phase, in a steel mill with an electrical contractor though. 64,000 volt 4/0 is some fun stuff. What I never understood (and never cared enough to think about until now) is how two 110 phases make 220 yet three 110 phases make 440 instead of 330. | |
07-07-2011, 12:36 AM | #86 | |
Newbie Join Date: May 2007 Location: New Zealand
Posts: 24
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I cant comment on how two phase systems becuase we get 230v per phase here in NZ | |
07-07-2011, 01:22 AM | #87 |
I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
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Indiana, call it what you want, but there is single phase 110/120VAC & 208/220VAC and 3 phase 208/220VAC & 440/480VAC in the US (yes, there is also 277VAC lighting). There is no "2 phase" (would love to see it in a NEC code book). For what you call "2 phase" is 2 hot leads vs. a hot & neutral, still single phase though. |
07-07-2011, 01:24 AM | #88 |
I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
Posts: 8,314
| Some is determined by is the power supplied by a "WYE" or "Delta" transformer. This can change the phase to phase & phase to ground voltage.
Last edited by Charlie-III; 07-13-2011 at 06:17 AM. Reason: Fix typo |
07-13-2011, 06:19 AM | #89 |
I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
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Well, I guess we covered everything in this thread. General AC info: http://www.powertogo.ca/phases.htm Wiki single phase: http://en.wikipedia.org/wiki/Single-...electric_power Wiki 3 phase: http://en.wikipedia.org/wiki/Three-phase_electric_power While there is no "2 phase" definition, there are a couple of "2 phase" callouts, in general though, you have single phase or 3 phase. A single phase can be hot to ground or hot to hot. Three phase it hot to hot to hot. Our brushless RC motors are a generated 3 phase system (from a DC source, similar to a 3 phase off of a single phase AC source using a convertor), switching any 2 wires will reverse motor rotation. Unlike other sources of power (gas engines) electric motors make max torque at "0" RPM's. It tapers down from there. NOTE: "hot" means live vs. a ground or neutral wire. Last edited by Charlie-III; 07-13-2011 at 06:48 AM. Reason: Added links |
07-13-2011, 02:10 PM | #90 |
RCC Addict Join Date: Jul 2009 Location: reelsville
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My point was in a 110 motor one wire feeds it, 220 is fed by two wires. A motor on 110 pulling 10 amps on a single wire, on 220 even at the same 10 amps it's 10 amps per wire.
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07-13-2011, 05:46 PM | #91 |
RCC Addict Join Date: Nov 2006 Location: Lowell, Arkansas
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Covered everything except for an actual test of different wire gauges and the difference in power output of the motor......
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07-13-2011, 06:03 PM | #92 |
I wanna be Dave Join Date: Apr 2007 Location: Arlington, Washington
Posts: 2,303
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Working on it....I picked up the connectors.....just have not had time, as I am trying to get these mini motors done.....people get angry when yer a day late on a preorder... Later EddieO |
07-13-2011, 08:16 PM | #93 |
RCC Addict Join Date: Nov 2006 Location: Lowell, Arkansas
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No problem, keep on windin'.
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07-13-2011, 08:19 PM | #94 |
I wanna be Dave Join Date: Apr 2007 Location: Arlington, Washington
Posts: 2,303
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I am past that part! These suckers are in the oven now, getting cut and balanced tomorrow! Later EddieO |
07-13-2011, 09:35 PM | #95 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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Nice! Can't wait to see the little peepers.
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07-24-2011, 07:04 PM | #96 |
Rock Crawler Join Date: May 2011 Location: SoCal
Posts: 949
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Just to throw another log on the campfire, remember that ac has to be treated differently than dc. It is not 120v. That's just the peak voltage and it varies between + and - 120 and averages zero . Enter RMS (root-mean-squared) or some such. But that's a tangent. What I wanted to ask about was how you're doing multi-wire junctions. My battery has to feed two esc's and a bec. I could solder up a squid, but was wondering about just soldering ring terminals to everything and then joining them with a trimmed bolt and nut. Advantage would be abililty to easily disassemble. Disadvantages, maybe a pain to insulate cleanly. And lotsa solder joints to fracture. I'm betting there's a better way and one of you guys will spill it. |
07-25-2011, 10:38 AM | #97 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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If you are soldering the ring terminals, you will be dealing with a lot of solder work anyway. A little deans plug Y harness with power feeding to the BEC directly would be about the cleanest way to do it.
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07-25-2011, 10:54 AM | #98 | |
Rock Crawler Join Date: May 2011 Location: SoCal
Posts: 949
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Tower has a Y and a hard Deans T, but those are both two-output and I need three. | |
07-25-2011, 10:56 AM | #99 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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I use this plug http://holmeshobbies.com/product.php...&cat=11&page=1 Then you just hardwire the BEC into the plug directly and all connections are taken care of. Not the lightest or smallest way, but the cleanest and easiest. |
07-25-2011, 11:53 AM | #100 |
Pebble Pounder Join Date: Jul 2008 Location: Tamworth, England.
Posts: 124
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Just a small heads up on "2 phase" Most generator`s that kick out 110volt and 220volt have two lots of 110volt windings. On 110 volt the amperage is doubled say for instance 16amp output, when 220volt is switched in the amperage is halfed to say 8amps. This is because the two 110volt windings are combined to give 220volts. This I am guessing could be classed as "2 phase" although in all my time as a plant fitter (25+ years) I have never heard it called that. |
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