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Re: Electric motor vs. Gas engine
Posted: Wed Feb 13, 2019 5:25 am
by pdq67
Rex Schimmer wrote: ↑Tue Mar 15, 2016 1:22 pm
Sparksalot,
Sounds like we are about the same vintage, I left school exactly 50 years ago and I probably took thermo around 1964-5.
Rex
Ah, "Thermo"!!
I took it in '71 or so?
I used to be able to calculate coal-fired power plant thermal eff's. Can't do it now because it's been too long ago.
pdq67
BSME
Re: Electric motor vs. Gas engine
Posted: Thu Feb 21, 2019 3:52 pm
by BBO Omega
A Toshiba 100hp 1800rpm NEMA Premium Efficient Motor is 95.4% efficient.
Re: Electric motor vs. Gas engine
Posted: Thu Feb 21, 2019 5:24 pm
by Newold1
That's pretty awesome efficiency compared to almost any ICE engine!
Re: Electric motor vs. Gas engine
Posted: Thu Feb 21, 2019 6:35 pm
by Schurkey
Newold1 wrote: ↑Thu Feb 21, 2019 5:24 pm
That's pretty awesome efficiency compared to almost any ICE engine!
How much energy does the battery-charging process take, vs. the delivered energy of that battery pack?
Re: Electric motor vs. Gas engine
Posted: Thu Feb 21, 2019 8:20 pm
by gruntguru
Lithium ion batteries can have round trip efficiencies as high as 95% when new, falling to 75% - 85% with age.
Re: Electric motor vs. Gas engine
Posted: Wed Mar 13, 2019 1:56 pm
by LoganD
Newold1 wrote: ↑Tue Feb 12, 2019 2:07 pm
I am not as electric motor knowledgeable as I am in IC engines, so can someone here share a little knowledge and explain here whether these new EV electric motors are running DC? and why as they are shown to be brushless motors how is that a benefit over brush and commutator motors. I have seen the control and power control systems in an EV and its a complicated looking piece of equipment. What is being done with the power output of the battery packs that this very involved control and conversion system accomplishes? Apparently from what I have learned these new EV electric motors are very efficient. How efficient?
They're AC.
The real magic of electric drivetrains isn't in the motor itself, it's in the drive. Advancements in the switching frequency, amplitude control, feed in and feed out, etc are where they're improving. The electric motors of 2019 are barely any better than those of 30 years ago.
Re: Electric motor vs. Gas engine
Posted: Thu Mar 14, 2019 12:39 pm
by BP758
Begs the question, should the new EV be allowed to race in conventional bracket dial in programs ? I would think the EV would not be affected by weather input other than maybe battery temp and charge? Looking at the new Tesla platform my bet is the technology is far superior to conventional cars? Like traction control etc...