Electric Motor efficiency and regen capability.

Anything to do with the electric or hybrid world

Moderator: Team

Post Reply
emsvitil
Pro
Pro
Posts: 292
Joined: Thu Mar 19, 2015 7:47 pm
Location:

Electric Motor efficiency and regen capability.

Post by emsvitil »

Three questions on Electric Motor efficiency and regen capability.

1. What is the typical efficiency of the electric motor? You put 100kW of energy in, how much is actually moving the car? (95kW 95% ??)

2. Same question on regen. 100kW of braking, how much makes it back to the battery? (95kW 95% ??)

3. Can it absorb the same amount of energy as it puts out? Does 100kW motor have 100kW of braking ability? Or is it less or more (50kW,150kW)



Just curious
Ed
underhead valve
Member
Member
Posts: 83
Joined: Mon Jul 13, 2009 10:33 pm
Location: south jersey

Re: Electric Motor efficiency and regen capability.

Post by underhead valve »

I don't know how much loss ,but some of the older electric cars I worked on used motor cooling for cabin heating
User avatar
Rick!
Expert
Expert
Posts: 528
Joined: Fri Jan 01, 2016 4:13 pm
Location:
Contact:

Re: Electric Motor efficiency and regen capability.

Post by Rick! »

emsvitil wrote: Wed Jul 24, 2019 7:55 pm Three questions on Electric Motor efficiency and regen capability.

1. What is the typical efficiency of the electric motor? You put 100kW of energy in, how much is actually moving the car? (95kW 95% ??)
https://www.engineeringtoolbox.com/elec ... d_655.html

2. Same question on regen. 100kW of braking, how much makes it back to the battery? (95kW 95% ??)
You only get to use one axle set for regeneration on a typical EV so in terms of kinetic energy recovery, it is around 55%. If you only look at kW out vs kW in, you recover around 25%. https://www.proev.com/LLPgs/LLei0005.htm

3. Can it absorb the same amount of energy as it puts out? Does 100kW motor have 100kW of braking ability? Or is it less or more (50kW,150kW)
Google is your friend.
Just curious
gmrocket
Guru
Guru
Posts: 7622
Joined: Wed Nov 12, 2008 6:40 pm
Location: Grimsby Ontario

Re: Electric Motor efficiency and regen capability.

Post by gmrocket »

I remember seeing a drag test of a tesla where they did all the math and it ran something like mid 12's which is pretty impressive for a 100k car (🤣😅😉) and figured out with its regen breaking it could do that EXACT same time for about 170 runs?


Correct me if I'm wrong
Post Reply