Regarding the name of the forum. What exactly is a German car ?
Is a MB produced in China or a BMW produced in US a German car ? Is a Tesla produced in Germany (soon) a German car ?
Where is the limit ?
And a little bit similar, what is an efficient motor ? Is it efficient on its own, or only if the combination of motor and car (with many parameters) is efficient ?
Which is the most efficient motor (in 2021) ? How much more efficient is it than the Daimler motors mentioned above ? (As a percentage please, and which percentage is equal to “totally kills it”.)
Which is the most efficient car ? Does it use the most efficient motor ? Why is this (not) so ?
Although the manner of your questions is not worth answering I'll try to explain some of the elementary and commonly accepted status quo of the electric motors: Basically there are three types of AC motors that are used in the EVs at the moment:
1. Induction motor: consists of a stator with windings (similar to the other two types) and a rotor called bird cage, which is very simple. The current running through the stator windings creates a Rotating Magnetic Field (RMF) that unduces current in the rods of the rotor, which creates forces that rotate it. The rotor is always lagging the RMF and the more it lags the more current is induced in the rods and so increasing the power. But all these induced current is wasted and that's why the Induction Motor is considered the least efficient of the three. But despite its drawbacks it has also some advantages in the field of efficiency. It can cruise, because there is only electric RMF, which direction and strenght can be controlled. So unefficient when change in working conditions occurs but very efficient when cruising and at higher speeds.
2. Permanet Magnet Synchronous Motor - this is the type used by Taycan and the EQS. It is very efficient when starting (good torque from 0) but there is a threshold of rpms after which a back RMF is created by the permanet magnet of the rotor and it counter acts the electric RMF in a way that it can eat up to 30% of the power, which makes it extremely unefficient after some speed. And as the EVs ussually do not have gears (Taycan has two gears, but the shorter one is only to improve the acceleration from a standstill) its not good at highway speeds. Also it can not cruise because the RMF of the PM rotor can not be switched off. This also worsens the efficiency. It is also the heaviest and uses a lot of neodim, which is a rear earth.
Due to its unefficiency at higher speed the manufacturers advertise the energy consumption in a city cycle or an eco cycle but they avoid giving the highway cycle.
3. Permanet Magnet assisted Synchronous Reluctance Motor - this is the newest generation of elmotors. It's efficient at low speeds but also at higher speeds. It doesn't create back RMF (its internally neutralized) and has very little neodim magnets. It is also lighter, very small amount of heats is generated. So also better for cooling and repeated accelerations. It needs very comlex control in order to shift between the hybrid principals of opperation and to avoid stalling when starting from 0. But is the technology of the future and anybody who doesn't use it can't claim that has state of the art technology.
The percentage of efficiency that some manufacturers give is valid only in certain conditions, load and speed, so it is not a correct way to claim efficiency.
I'm sure that in normal tests the EQS will have the same efficiency as the Taycan, due to the similar technology of the motors and the batteries, very similar weight and very similar aerodynamics ( the EQS has a slightly better Cd but its frontal area is bigger, so that the Taycan has slighly better aerodynamics).
