this post was submitted on 24 Nov 2025
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Electric Vehicles
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And the torque of a motor is proportionate to the square of the voltage
So it's not producing twice as much torque, it's producing four times as much
But that doesn't matter in case of EVs, since 800/400V refers to the battery voltage. The motors are driven by variable voltage and frequency AC that is completely decoupled from the battery voltage.
I wouldn't say it doesn't matter. If your motors are rated for the full voltage (and why wouldn't they be?), they will have higher maximum torque. Or you can use smaller, lighter motors.
I haven't worked with EVs, so l but I did quite a bit with stationary, industrial, synchronous motors driven by VFDs. In that application, the V/f curve is used mostly to control torque and power efficiency. But the voltage drop isn't that dramatic.
I imagine the EV brain would do clever things such as increase voltage to accelerate the car, while reducing it in cruise to reduce power draw. But there are clear advantages to having a higher voltage battery.
TIL