I’ve heard that fact, and I know ICE cars have a torque curve but I don’t understand why it is that an electric motor produces torque instantly.
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First, non-instant torque is not a property of ICEs in general, but specifically piston engines. Jet turbines are ICEs too, but they produce instant torque, exactly like electric motors.
The reason is simple: piston engine have to move pistons to keep going, and that is tied to the rotation of the shaft. The faster the shaft rotates, the faster injection-ignition-exhaustion cycle happens – the more torque is produced. If RPM is near 0, the engine cannot even go from one ignition to the next, and stalls.
The same is not true for electric motor or the jet turbine. Electric motor works on magnetic attraction-repulsion, and it does not depend on rotation of the shaft. Jet turbine works on fuel exhaust pressing on the blades, and it is also independent from shaft rotation. Both these engines can produce torque even at 0 RPM (you can block the shaft, and it will still provide force).
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