How Electric Motors Have Become All Torque


There exists a pronounced difference in the driving experience once you step into an EV the very first time. There is typically no gearbox or transmission. Electric motors differ greatly from internal combustion engines in the way they deliver torque and power, and for the most part, you possess full torque from the instant you mash the accelerator pedal till the motor overheats. It’s as an instant go pedal – there’s no hanging about waiting for the engine to have up to speed, no changing gears, nothing. Unless you’ve driven an EV it’s very difficult to explain what it is like, but the easiest way is this: imagine your vehicle in first gear with the foot flat to the floor. Now believe that acceleration all the way up up to the top level speed from the car without the interruption. But accompanied by an electrical buzz that sounds like a swarm of bees on crack.

An assessment of combustion and electric engine torque and power curves

The graph here will give you a theoretical comparison. The orange plot represents an electrical motor torque curve and also the blue plot represents a power motor power curve. The black plot shows a very high performance internal combustion engine torque curve by comparison. Out of this you can see the total torque from zero of your electric motor as well as the linear power delivery. It’s also interesting to note that a majority of decent petrol engines are spent by about 8000rpm whereas a half-decent EV motor can go as much as 15000rpm or so.