5 ms·
No; brakes function by turning the kinetic energy of the vehicle into heat via friction; using the motors for braking via regeneration produces some heat, but a
by CobaltFire 3y ago
No; brakes function by turning the kinetic energy of the vehicle into heat via friction; using the motors for braking via regeneration produces some heat, but a fraction of the amount.
For reference, it’s not uncommon to see temperatures of 1000F or higher after a single highway speed stop on the front rotors of most passenger vehicles. Having that amount of heat that close to the motor is something that needs to be designed around. The rear brakes will typically be 200-400F cooler depending on the weight bias, but that’s still not a trivial amount of heat.
- moralestapia 3y agoa) An ICE car is going 60 mph and brakes to a standstill. b) An electric car is going 60 mph and brakes to a standstill. How does one generate more heat than the other? Why would the brakes "cook themselves" in b when they don't in a? >For reference, it’s not uncommon to see temperatures of 1000F or higher after a single highway speed stop on the front rotors of most passenger vehicles. I'd like to see that reference. 1000F is F1 tier, lol.
- iancmceachern 3y agoBecause in this proposed design the motor is the brake rotor, they're the same part. So when you apply the brakes, they get hot, so does the motor. Motors getting hot is not good.
- moralestapia 3y agoI see, maybe that's why they only add motors to the back wheels, though.
- iancmceachern 3y agoCars Have brakes on all 4, but thr fronts do 70% of the work.
- moralestapia 3y ago>but thr fronts do 70% of the work Yes, maybe that's why they only add motors to the back wheels (x2).
- iancmceachern 3y agoYeah but what about the other 30% You can't just start taking parts off of cars without understanding the impacts. Also, ebrake, etc. These things are required by law.
- moralestapia 3y ago>Yeah but what about the other 30% Handled by the motor, the motor is the brake IIRC?
- iancmceachern 3y agoElectric cars have regenerative braking and also regular brakes. Regenerative braking doesn't replace the need for brakes. There are lots of reasons why, safety reasons, that you need thr brakes to work even if power fails, when the car is parked etc.
- moralestapia 3y agoSure, but wouldn't having regenerative breaking put less load on the stock brakes?
- iancmceachern 3y agoAt certain times. At other times the regenerative braking isn't even operating. So unfortunately it doesn't do much good because you still need to design the brakes to cover what's needed during those tines when regenerative braking isn't helping.