Search found 66 matches

by JackB
Jul 23 2015 11:05am
Forum: Battery Technology
Topic: Prius taxi logs 600k miles on original battery pack
Replies: 7
Views: 622

Re: Prius taxi logs 600k miles on original battery pack

The Prius battery is 6.5ah. The car continues to work until the batteries are down to 1.5ah. The battery pack can be well past dead in terms of capacity and still work. This isn't possible in an EV. A pack with only 25% capacity would not 'work' anymore. The Prius is a gasoline powered car that gets...
by JackB
May 29 2015 12:47am
Forum: Electric Watercraft
Topic: 30 FOOT MOTOR CRUISER, what would it need?
Replies: 24
Views: 4285

Re: 30 FOOT MOTOR CRUISER, what would it need?

Boats take a huge amount of energy to move at speed.
If you go really slow, they need much less.
So a fast electric boat is just not a viable option, unless you are just going a few miles and back.
by JackB
May 08 2015 1:42pm
Forum: Battery Technology
Topic: 20kWh of energy needed, battery choice advice anyone?
Replies: 18
Views: 2203

Re: 20kWh of energy needed, battery choice advice anyone?

Then he should join electric-boat-forum.com and start a project on there. I'm building a 64ft solar boat. Life is a very safe chemistry that is a good choice for boats, as weight is not so important. Using thousands of little cells is really only ideal for a company that wants you to pay a premium t...
by JackB
May 07 2015 5:44pm
Forum: EV Business World
Topic: Investing in Tesla General Discussion Thread
Replies: 90
Views: 16276

Re: I bought 75 shares of Tesla Stock for $231 per share

GM sells the all-electric Spark EV, which apparently is now outselling the Volt, even thought the Spark is only sold in California and Oregon. The Model S is a gross e-polluter, hauling around 4,500 lbs to move a single person. You'd think at least the e-bike people would understand this. What a sha...
by JackB
May 07 2015 5:17pm
Forum: Battery Technology
Topic: Gigafactory Chemistry Confirmed
Replies: 8
Views: 987

Re: Gigafactory Chemistry Confirmed

Did we know how these batteries are going to be recycled?
by JackB
May 07 2015 4:24pm
Forum: Battery Technology
Topic: Tesla Powerwall $350 / kwh Retail
Replies: 151
Views: 17534

Re: Tesla Powerwall $350 / kwh Retail

Billionaire worship, sad state of affairs in America.
by JackB
May 04 2015 5:39pm
Forum: Battery Technology
Topic: Tesla Powerwall $350 / kwh Retail
Replies: 151
Views: 17534

Re: Tesla Powerwall $350 / kwh Retail

No question lithium batteries are better, although the cycle life claims are just that, claims, I recall the early days claims of 5,000 cycles, what a big lie that was. What maybe you don't understand is that we've had lead forever, its cheap, it works. Having lithium does not suddenly change everyt...
by JackB
May 04 2015 3:16pm
Forum: Battery Technology
Topic: Tesla Powerwall $350 / kwh Retail
Replies: 151
Views: 17534

Re: Tesla Powerwall $350 / kwh Retail

Lead acid batteries have been used in RV and boats for decades, they have no real issue with all that nonsense. In stationary applications, there is even less issues. Musk wants to create low cost lithium batteries, that is great. But this Powerwall is a stretch, and not a single bit of innovation i...
by JackB
May 04 2015 11:58am
Forum: Battery Technology
Topic: Tesla Powerwall $350 / kwh Retail
Replies: 151
Views: 17534

Re: Tesla Powerwall $350 / kwh Retail

And what prevents using a lead acid battery pack for this power storage, which is half the price
and has been available, I dunno, for about 100 years already. And is completely safe and simple,
and also HIGHLY RECYCLED. Has Elon announced his factory to recycle his batteries?
by JackB
Apr 23 2015 4:43pm
Forum: Motor Technology
Topic: One-Phase Generator Rewind to 3-Phase BLDC
Replies: 13
Views: 1959

Re: One-Phase Generator Rewind to 3-Phase BLDC

The lams were already electrically connected to each other, they are welded together at the edges.
The drilling/grinding does increase the area connected, I'm convinced it doesn't matter much at all, but I am just a motor 'jack'. :)
by JackB
Apr 21 2015 10:49pm
Forum: Motor Technology
Topic: One-Phase Generator Rewind to 3-Phase BLDC
Replies: 13
Views: 1959

Re: One-Phase Generator Rewind to 3-Phase BLDC

I've finished building the new rotor. Used some aluminum disks made on the lathe, and epoxied the magnets.
I'm wondering how to balance this rotor. The lathe will spin up to 2500rpm, and it doesn't vibrate that I can tell,
but it is pretty secure in the lathe.
hfrotormag.jpg
hfrotormag.jpg (71.19 KiB) Viewed 1629 times
by JackB
Apr 09 2015 3:57pm
Forum: Battery Technology
Topic: =>Chevy Volt - GO Plugless!...
Replies: 17
Views: 1609

Re: =>Chevy Volt - GO Plugless!...

It was my view 10 years ago this was the thing that would be a killer app, not EVs themselves..
as it just makes so much sense. But these guys don't look to have done it very well. :wink:
by JackB
Apr 09 2015 3:52pm
Forum: E-Vehicles General Discussion
Topic: 1st electric highway for trucks
Replies: 5
Views: 760

Re: 1st electric highway for trucks

Looks like a good idea, for recharging them, not for powering them, as it would then require stringing wires 'all over the freeking place',
but as a short charging section every so often, it would work great.
by JackB
Apr 07 2015 11:18am
Forum: Motor Technology
Topic: One-Phase Generator Rewind to 3-Phase BLDC
Replies: 13
Views: 1959

Re: One-Phase Generator Rewind to 3-Phase BLDC

major wrote:Image does not show.
redid as attachment, should see it now. thanks.
by JackB
Apr 06 2015 10:37pm
Forum: Motor Technology
Topic: One-Phase Generator Rewind to 3-Phase BLDC
Replies: 13
Views: 1959

Re: One-Phase Generator Rewind to 3-Phase BLDC

So I have removed the unneeded stator teeth, and did some major lightening and grinding on this stator.
It can now accept a significant larger amount of windings on the teeth, and will be much easier to wind as well.
by JackB
Apr 03 2015 2:18pm
Forum: E-Vehicles General Discussion
Topic: EV transmissions and Popular Science
Replies: 88
Views: 8967

Re: EV transmissions and Popular Science

If you don't call a gear reduction and a differential a 'tranmission', then I guess Tesla engineers are really really clever. What I have suggested in the past, which i think IS clever :) is direct drive from a dual shaft motor to wheels with two torque converters between the shafts and wheels. They...
by JackB
Apr 02 2015 8:01pm
Forum: E-Vehicles General Discussion
Topic: EV transmissions and Popular Science
Replies: 88
Views: 8967

Re: EV transmissions and Popular Science

Are the OEM EVs that all use transmissions/gears, those guys are just not very clever? POWER is TORQUE * RPM. Simple case If you can increase RPM, you have more power. So we just need a couple 4000 amp 12v hub motors and we are good? Electric motors efficiency varies over their RPM range, nothing li...
by JackB
Mar 30 2015 1:21pm
Forum: Motor Technology
Topic: Exploding FETs
Replies: 26
Views: 3262

Re: Exploding FETs

Exploding FETS is just part of motor controller development. :(

Might just be over amped, but usually it is voltage spikes after turn off.
They can easily spike 4x, so 22v x 4 = 88v > 75v = explosion

What does the scope trace show?
by JackB
Mar 29 2015 6:58pm
Forum: Motor Technology
Topic: One-Phase Generator Rewind to 3-Phase BLDC
Replies: 13
Views: 1959

Re: One-Phase Generator Rewind to 3-Phase BLDC

So I think I understand why the program output layout skipped the even fingers. It is quite difficult to get good fill winding two fingers that share a slot. It is much easier to wind a single finger and fill the slot. As I prepared to drill lighten holes in the stator, it occurred to me perhaps wha...
by JackB
Mar 28 2015 2:34pm
Forum: EV Business World
Topic: Working for Tesla... What's it like?
Replies: 50
Views: 8203

Re: Working for Tesla... What's it like?

Reno is freezing cold in the winter and blazing hot in the summer.
And populated by people who left california so they avoid paying taxes.
Sounds bad to me... and if I said what I think of Musk and Tesla, that would be worse.
by JackB
Mar 27 2015 12:34pm
Forum: Motor Technology
Topic: One-Phase Generator Rewind to 3-Phase BLDC
Replies: 13
Views: 1959

Re: One-Phase Generator Rewind to 3-Phase BLDC

10 poles, 10 magnets look better to me. And what was that, a 2 pole alternator? Pretty thick back iron to carry around if you're planning to make a bike motor from this. Yes, why does it have such thick back iron? I'm far from a motor expert, but it seems this is needed when the coils are overlappi...
by JackB
Mar 27 2015 11:38am
Forum: Motor Technology
Topic: One-Phase Generator Rewind to 3-Phase BLDC
Replies: 13
Views: 1959

Re: One-Phase Generator Rewind to 3-Phase BLDC

So I did the layout without the skipped windings, and it seems to make sense to me,
I redid as a liner layout, and here are the first three commutations, the next three are just the reversed polarity.
Is there something I missing? :?:

genlinear.jpg
genlinear.jpg (101.61 KiB) Viewed 1867 times
by JackB
Mar 27 2015 10:32am
Forum: Motor Technology
Topic: One-Phase Generator Rewind to 3-Phase BLDC
Replies: 13
Views: 1959

Re: One-Phase Generator Rewind to 3-Phase BLDC

Thanks for that link. What it came up with for 20 magnets is this, which is what I was thinking of doing,
but not with the empty ones. This is also ABCABC. Why skip the even ones?
hfgen20pole.jpg
hfgen20pole.jpg (131.32 KiB) Viewed 1890 times
by JackB
Mar 27 2015 12:50am
Forum: Motor Technology
Topic: One-Phase Generator Rewind to 3-Phase BLDC
Replies: 13
Views: 1959

One-Phase Generator Rewind to 3-Phase BLDC

I am rewinding/modifying a generator head from 120vac single phase into a 3-phase BLDC. I think I know how to do this, but before I spend the many hours it takes to rewind, I'd like to make sure I'm doing it right. ;) This generator head stator has 30 slots. Picture below after I have removed the ol...