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My (URL) motors comparison page> now includes tests of the E-motor from (URL) Energy Add-On Set (9688)>. (URL) Enjoy! (URL) Philo> (14 years ago, 12-Jan-11, to lugnet.announce, lugnet.technic, lugnet.robotics, FTX) !
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(...) Thank you! Surprising that with as easy as it is to backdrive, that the efficiency is as low as it is. Out of (not idle) curiosity, is it possible to drive even more current-hungry devices safely from the NXT? I need a way to drive a 120V AC, (...) (14 years ago, 12-Jan-11, to lugnet.technic, lugnet.robotics)
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Hi Brian, (...) I was surprised too. I suspect a relatively high internal resistance of the windings, rather than mechanical friction, as the source of losses. No, (shame on me!) I didn't checked yet with an ohmmeter. (...) This is clearly outside (...) (14 years ago, 13-Jan-11, to lugnet.robotics, lugnet.org.us.smart)
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(...) I've been operating outside my personal SOA for years now :) (...) It's actually not a motor - it's a small electric hot water heater element. When plugged in it produces 1300W, but if I want less than that I need to figure out some way to (...) (14 years ago, 13-Jan-11, to lugnet.robotics, lugnet.org.us.smart)
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(...) Good thing, the load is not inductive. (...) OK, with a 1 second cycle time, and pure on/off, it is simpler. All you need is a solid state relay. (...) Looks like some people do: (URL) and worse, most of these dimmers work by dissipating and (...) (14 years ago, 13-Jan-11, to lugnet.robotics, lugnet.org.us.smart)
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(...) Interesting thread, even if a bit off topic of LEGO motors. I'm not an expert on power circuits, but a google search turned up this web site with a number of interesting power supply circuits (there is a search option). (URL) Putz (URL) (14 years ago, 13-Jan-11, to lugnet.robotics, lugnet.org.us.smart)
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(...) No, purely resistive. Although it does have a "boot up" time, I think it's just due to heating up the element. I'm not completely sure if the element will respond better to a "dimmer" type set-up (running it at less than normal voltage) or a (...) (14 years ago, 15-Jan-11, to lugnet.robotics, lugnet.org.us.smart)
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(...) I have come across some industrial heater controls. To get the heaters at part power (to run them in a closed-loop temperature control), a method of burst firing is used. The circuit measures the zero crossings of the AC supply and turns the (...) (14 years ago, 25-Feb-11, to lugnet.robotics)
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