Searching from 2020-08-26 00:00:00 to 2020-08-26 23:59:59.999999.
Query completed in 0.45 seconds
[2020-08-26 01:04:34] <Lucifer_arma> Z-Man: I'm actually looking at using an AC motor (converting an alternator to a motor) because I can't find a DC motor that satisfies the requirements, but I think an alternator will.
[2020-08-26 01:05:15] <Lucifer_arma> The plan is to put an alternator on the crankshaft that'll generate electricity like it do, and put another one to drive the wheel through the existing final drive gearbox, and use batteries to cache any extra electricity generated.
[2020-08-26 12:26:01] <Z-Man> So you eliminate the gear and replace it with the alternator-battery-motor construction?
[2020-08-26 12:29:38] <Z-Man> Lucifer: And the Voltage-Current specs are for the role as alternator? Anything specific? For the power formula to work, the Voltage and Current need to be effective Voltage and Current (sqrt(.5)*peak), and both need to be those measured on a hypothetical Ohmian consumer. I would suppose they are that, given that the 110/220V wall socket voltage also is the effective one.
[2020-08-26 12:31:09] <Z-Man> You're going to need to control the input for your converted motor correctly, of course. It needs to be in phase with the rotation of the motor.
[2020-08-26 12:34:03] <Z-Man> Are the alternators three phase? Probably not. You're going to have the problem that your motor can't start from every position. Or rather, you can't reliably start FORWARD from every position.
[2020-08-26 12:38:11] <Z-Man> If the permanent magnet and the coil are aligned, you can send the current in one way to lock the system in place, or the other way to try and flip the magnet (assuming the permanent magnet is what's rotating). But you don't know which way around it will go.
[2020-08-26 12:39:00] <Z-Man> With a three pase thinky, there would always be two of the three connections you can send current through to push it in any direction you want.
[2020-08-26 12:39:32] <Z-Man> (Disclaimer: Physicist, not Electrical Engineer. All Cows considered Spheres.)
[2020-08-26 19:58:41] <Lucifer_arma> Z-Man: I'm eliminating the clutch and the CVT, but keeping the final drive, since previous calculations indicate I only need around 3000rpms on the motor to get a top speed that's higher than the chassis can safely travel
[2020-08-26 19:59:59] <Lucifer_arma> As of right now, Voltage-Current is basically unknown. I only know the max output from the 12v voltage regulator, and that varies by alternator (ranging from 25A up over 100A in the form factor that results in the final assembly that I'm trying to have, which is mounting these motors under the existing CVT cover)
[2020-08-26 20:00:16] <Lucifer_arma> There are losses in the voltage regulator, and I don't know how many.
[2020-08-26 20:01:06] <Lucifer_arma> The magnet in the middle that's being spun is an electromagnet, so I have complete control over it. It's also DC-powered. In the alternator configured to generate electricity, it's a three phase design that can be modified to be single phase.
[2020-08-26 20:01:45] <Lucifer_arma> Anyway, the way it works is first you prime the alternator by juicing the windings on the shaft, then when the engine starts, the drive belt spins the shaft and generates current in the stator
[2020-08-26 20:03:24] <Lucifer_arma> spinning the magnet as you suggested to put it in a known starting state won't be possible since it'll be mechanically connected to the wheel. Essentially, you're suggesting I'm going to have to push off from a start to ensure the motor spins the correct direction.
[2020-08-26 20:03:51] <Lucifer_arma> Which leads me to the question: how do they manage it in current electric vehicles? Tesla/Toyota/et al use AC motors.
[2020-08-26 20:10:35] <Lucifer_arma> anyway, the power calculations are for determining if the electric motor will give at least the same overall performance as the gas engine. It might be ok if it's a tad slower to accelerate, but top speed needs to be at least as high (55mph or so).
[2020-08-26 20:11:20] <Lucifer_arma> So that's what determines the physical size of the electric motor: what's the size needed to push the bike as quickly as the current 150cc single cylinder gas engine? Hence the math.
[2020-08-26 20:12:30] <Lucifer_arma> Also, technically the 12 volt voltage regulator is a 14.5V regulator. It's a 12-volt system in that everything works with 12 volts, but the alternator has to push out some extra to charge the battery used to start the engine.
[2020-08-26 20:13:24] <Lucifer_arma> But in this case, that's not needed. I can use as many batteries as I need to run the alternator at whatever voltage I need, probably in 12 volt increments because those are the easiest/cheapest batteries to source.
[2020-08-26 20:14:08] <Lucifer_arma> There'll be an arduino speed controller, in all likelihood (although I'm willing to buy an off the shelf AC motor controller), and I'm already aware that you use frequency to control AC motor speed
[2020-08-26 20:14:54] <Lucifer_arma> I can start with a gauge indicating voltage of the batteries on my instrument cluster and manually starting the engine to charge them, but ultimately I'll want that automated, like in the hybrid cars
[2020-08-26 20:15:33] <Lucifer_arma> So it's the most basic hybrid configuration, originally popularized on trains and submarine: A gas-powered generator for electricity, batteries to cache the generated power, and an electric drive motor
[2020-08-26 21:12:16] --> Z-Man- has joined the channel
[2020-08-26 21:12:17] -!- Z-Man changed nick to Guest46731
[2020-08-26 21:12:17] <-- Guest46731 has quit (Killed (adams.freenode.net (Nickname regained by services)))
[2020-08-26 21:12:17] -!- Z-Man- changed nick to Z-Man
[2020-08-26 22:12:09] <Armanelgtron> I'm semi suspcious of this post ... https://forums3.armagetronad.net/viewtopic.php?f=1&p=315450 vs https://discuss.codecademy.com/t/what-languages-do-i-need-to-know-to-create-a-new-forum-software/375348
[2020-08-26 22:12:42] <Armanelgtron> unless it happens to be the same person who decided to come to a phpbb-based forum for some random game
View entire month
DISCLAIMER: These logs of public chat may contain some content which may not be appropriate for all audiences. Use at your own risk.
Logs from 2006-2009 pulled from wrtlprnft
Format changes at: 2015-08-25, 2017-02-20, and 2020-03-23. Times (2015 and later) should be Eastern.