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Thread ID: 80375	2007-06-20 11:22:00	any electric motor experts out there?	motorbyclist (188)	PC World Chat

Post ID	Timestamp	Content	User
561107	2007-06-23 12:27:00	ok thanks i've decided to go for a controller, pot just seems too unreliable/flammable lol	motorbyclist (188)
561108	2007-06-24 22:11:00	i've decided to go for a controller, pot just seems too unreliable/flammable lol "Pot" . . . in and of itself is SUPPOSED to immolate . . . as for the "controller" . . we should all have one of these . Now . . the "unreliability" factor of pot isn't usually an issue . . . it seems to work for some but not others . . it's pretty black and white . Never having used pot myself, these are just observation of other-people's actions and uses of the demon weed . I am however glad that you are attracted to the digital system as opposed to the fire-in-bedlam approach to electrically motivational bicycleled transport . Asking as only one person here, please keep me informed on your experiments and outcomes .	SurferJoe46 (51)
561109	2007-06-24 22:36:00	You couldn't use a pot (potentiometer) anyway, it is essentially a variable voltage divider. What you could use (if you wanted an inbuilt heater on the bike) is a rheostat, which is a variable resistance, however it would have to be capable of dissipating >1kW of power which would be wasted energy from the battery, so you have no viable option other than to use an electronic controller, preferably one that can return power to the battery on the overrun. I suspect that this project is well outside your technical skills, and the skills of a few of the people offering opinions. There is some useful advice in the thread though, but you have to be able to understand it in both principle and practice for it to be of any use to you. Some of the science is described Here (www.buet.ac.bd) but for more practical information from like-minded individuals look Here (electricmotorcycles.net) instead. This also has a full block diagram of the electronics etc, and if that doesn't put you off the project, nothing will. Cheers Billy 8-{) Nearly forgot, before anybody posts smart comments about the pot hanging off the controller, that is a genuine potentiometer being used as the accelerator as such. It is a non power-dissipating device like the volume control on a radio and will vary the mark-space ratio of the controller output to adjust the net power out to the motor.	Billy T (70)
561110	2007-06-25 01:15:00	Moi?	SurferJoe46 (51)
561111	2007-06-25 01:41:00	Moi? Not sure what you are moi-ing about SJ, but my comment about technical skills (or lack thereof) applies to anybody who can't quote Ohm's law without looking it up, or solve for voltage, current, resistance & power. Without that basic knowledge, a budding enthusiast wouldn't know which was was up in relation to the development of an electric powered motorcycle, as evinced by debate over resistance controllers. Presuming that effective operability and range are the goals, there is only one way of achieving motor speed control that offers any real hope of success. Such knowledge is easy to gain, but is necessary before you start, unless building a kitset of course. Ohm's law on its own is not enough either, but it's a start. Cheers Billy 8-{)	Billy T (70)
561112	2007-06-25 02:11:00	I was pulling you tail a little . . I am bored and on Sundays (here now) I get a little more bored toward early evening and just pop off a lot about things that make me smile . :o The "moi" was in response to your response to my response about being sarcastic and generally being . . well . . . this part was just funny to me, that's all: Nearly forgot, before anybody posts smart comments about the pot hanging off the controller, that is a genuine potentiometer being used as the accelerator as such . It is a non power-dissipating device like the volume control on a radio and will vary the mark-space ratio of the controller output to adjust the net power out to the motor . I was just enjoying myself at your expense . . sorry . . . . I shall try to refrain in the future as not everybody gets what I find oxy-moronic . . . . . and besides I never saw your pot hanging anywhere nor would I make a snide remark about breadboarding . . . . . . been there . . . done that . . and I have no intention of insulting you . . From a yank . . the noun, not the verb .	SurferJoe46 (51)
561113	2007-06-25 10:49:00	hold on, i was told a rheostat and pot were the same thing; a variable resistor. and yes, i am rapidly learning how complicated this stuff can be, as such i've gone for the controller:) to help me learn by/while doing i'm looking at one of the kitsets/packages from here (www.electricmotorsport.com) (or course i'll get a quote from other suppliers like electropar first) it's just that our dollar is about to be brought back down so i want to get some hardware while it's relatively cheap. i'll keep you guys, or atleast surferjoe, posted on my progress	motorbyclist (188)
561114	2007-06-25 14:50:00	TY	SurferJoe46 (51)
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