Electric Motor

Electric Motor







The 70 cm long cast aluminum housing on the hybrid module is located between the combustion engine and the automatic transmission. Three-phase current connections that link the module directly to the power electronics are located on the housing. Power is supplied to and drawn from the E-machine along these 288 V lines.

Purely electric driving is possible on a flat road up to approx. 30 mph (50 km/h), and speeds of up to approx. 37 mph (60 km/h) are possible in E-Power mode. Temperature sensors integrated in the stator coils monitor the temperature and send the measured values to the hybrid manager via the CAN bus. The relevant connection is located between the coolant connections.

The following table contains technical data relating to the electric motor.







Stator/Rotor










The stator is an external component of the electric motor that has 36 individual tooth coils made from copper wire and is secured in a defined position on the electric motor housing. The rotor position sensors fitted to the stator measure and transmit the current position of the rotor to the control unit in the power electronics. This data is then used to adjust the frequency to achieve the required speed and supply a three-phase alternating current to the coils.

Permanent magnets made from neodymium iron boron in the inner rotor generate a magnetic field. The rotor is fixed to the drive shaft and fitted to the stator in such a way as to enable a rotary movement. The flex plate secured to the back of the rotor establishes the connection to the transmission.

When the engine is operating, the electric motor generates a maximum of 38 kW of electric power at a voltage of 288 V, which is output with a specified efficiency degree of 90 % in the form of mechanical power amounting to approx. 34 kW. The E-machine delivers this power continuously across almost the entire engine speed range until just before the combustion engine reaches the speed limit. In Boost mode, the total power outputs of the combustion engine and electric machine are added, with the result that the power curve of the overall system has the characteristic of a combustion engine.

Electric motors can reach maximum torque from a standing start. When combined with the combustion engine, electric motors provide an opportunity to improve power output, especially at low engine speeds.
- The maximum torque increases during boosting, which enhances driving off capabilities in particular.
- Operating alone, the electric motor can accelerate the vehicle from a standing start if the accelerator pedal is pressed gently.

Below engine speeds of 1,150 rpm, e.g. when driving off, the torque can be increased from 285 Nm to a maximum of 300 Nm for approx. 3 seconds (boosting).