2021-2026 Audi RS E Tron Gt 4 Door Power units User Manual
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Power units for Your Audi RS E Tron Gt 4 Door First Generation (2021-2026)

Power units  
Electric drive motor for front axle  
Motor with code EBGA  
Torque/power curve  
684_377  
684_055a  
Power in kW  
Torque in Nm  
Characteristics  
Technical data  
Insert  
e-tron GT and RS e-tron GT (front axle)  
Engine code  
EBGA  
Body type  
Permanently excited synchronous motor  
Type of rotor  
Internal rotor  
Pole pairs  
4
Cooling  
Cooling jacket around stator windings  
Coolant  
G12 evo  
80 kW  
Continuous power output in kW at 8000 rpm  
Peak power output at 8000 rpm  
Torque in Nm at up to 5500 rpm (4 sec)  
175 kW  
300 Nm  
19  
Electric drive motor for rear axle  
Motor with code EBFA  
Torque/power curve  
684_378  
684_055b  
Power in kW  
Torque in Nm  
Characteristics  
Technical data  
Application  
e-tron GT (rear axle)  
Motor code  
EBFA  
Body type  
Permanently excited synchronous motor  
Type of rotor  
Internal rotor  
Pole pairs  
4
Cooling  
Cooling jacket around stator windings  
Coolant  
G12 evo  
120 kW  
320 kW  
340 Nm  
Continuous power output in kW at 10000 rpm  
Peak power output at 10000 rpm  
Torque in Nm at up to 5000 rpm (4 sec)  
20  
Motor with code EBEA  
Torque/power curve  
684_391  
684_055b  
Power in kW  
Torque in Nm  
Characteristics  
Technical data  
Application  
RS e-tron GT (rear axle)  
Motor code  
EBEA  
Body type  
Permanently excited synchronous motor  
Type of rotor  
Internal rotor  
Pole pairs  
4
Cooling  
Cooling jacket around stator windings  
Coolant  
G12 evo  
170 kW  
335 kW  
550 Nm  
Continuous power output in kW at 8000 rpm  
Peak power output at 6700 rpm  
Torque in Nm at up to 5900 rpm (4 sec)  
21  
Introduction  
684_219  
Permanently excited synchronous motors are fitted on front and rear axles of the e-tron GT and RS e-tron GT (type F8). The high  
power density of the motors allows for a very dynamic motor response. The construction of the electric drive motors differs in the  
active length of the rotor/stator core. The design of the power electronics is also different on the front and rear axles. The power  
electronics on the front axle can process a maximum current of 300 amperes. The power electronics on the rear axle can manage  
600 amperes.  
Construction of electric drive motors  
General information  
The electric drive motors on the Audi e-tron GT (type F8) are permanently excited synchronous motors. On the rear axle, this is a  
construction parallel to the axle, and on the front axle it is coaxial. Different power outputs from the electric drive motors are ach-  
ieved by different rotor/stator core lengths. The larger the rotor/stator core is, the larger the magnetic field will be. This is referred  
to as the length of the active components.  
Active length of front axle  
160 mm  
190 mm  
130 mm  
245 mm  
210 mm  
245 mm  
Diameter of axle  
Active length of rear axle (e-tron GT)  
Diameter of rear axle (e-tron GT)  
Active length of rear axle (RS e-tron GT)  
Diameter of rear axle (RS e-tron GT)  
22  
Drive motor on rear axle (e-tron GT)  
Drive motor on rear axle (RS e-tron GT)  
684_375  
684_376  
Front axle  
684_252  
23  
Rear axle  
684_379  
Rotor  
The rotor is made up of permanent magnets arranged with alternating poles. The magnets used are very strong ferrite magnets  
that are magnetised artificially during manufacturing. The air gap between the rotor and the stator is kept very small, increasing  
the efficiency of the motor.  
684_429  
Stator  
The stator is made of thin metal plates that are insulated from one another. The plates strengthen the magnetic field produced by  
the current flowing through the copper windings. The copper windings are integrated in the metal plates and are known as hairpin  
windings. The advantage of this type of winding is that, compared to conventional windings, a higher amount of copper can be  
housed in the same amount of space. Heat dissipation characteristics are also improved by this type of winding.  
24  
684_430  
Conventional winding  
Hairpin winding  
684_373  
684_374  
Drive motor rotor position sender 1 G713 / rear drive motor rotor position sender G1095  
The rotor position senders work on the resolver principle. The senders consist of a rotor disc made of field-conducting material,  
field coils and receiver coils. All receiver coils have a different number of windings. Because the field coils are supplied with a sinus-  
oidal voltage, a magnetic field is generated in the field coils. This magnetic field is induced in the receiver coils.  
If one of the lobes of the rotor disc now intersects the magnetic field of a receiver coil, the magnetic field in the corresponding coil  
is strengthened.  
Because of the different number of windings, the control unit can detect the position of the rotor precisely. The speed of the elec-  
tric drive motors is determined based on the number of occurrences. The rotor position senders do not wear and are resistant to  
ageing.  
25  
684_335  
Electric drive cooling system  
Coolant flows through the electric drive motors on the front and rear axles. They are integrated in the coolant circuit for the electric  
powertrain. The power electronics are also integrated into this coolant circuit. The coolant flowing in is first directed to the power  
electronics to dissipate the high levels of heat at the power modules. The coolant then flows through the stator cooling jacket. On  
the rear axle, the coolant is additionally routed through the 2-speed transmission unit, before it leaves the electric drive motor. On  
the Audi e-tron GT, only G12evo coolant must be used.  
Front axle  
Rear axle  
684_241  
684_242  
26  
Description of function  
The power electronics applies an alternating voltage displaced by 120° to the coils. This generates a magnetic field that alternates  
its direction continuously. This characteristic is also used to drive the rotary-mounted magnets. If the positive edge of the sine  
wave is applied to the coil, the north pole is attracted; when it is the negative edge, the south pole is attracted. The motor begins to  
turn. The faster the frequency of the power electronics, the quicker the motor turns. In recuperation, a voltage is induced in the  
stator coils by the magnetic field of the permanent magnets. This energy is used to charge the battery. As the electric drive motors  
on the Audi e-tron GT are permanently excited synchronous motors, the rotation of the field in the stator is just as fast as the speed  
of the rotor. The motors are fully regulated by the power electronics, which process the driver’s requests.  
Reference  
Further information on this topic can be found in Service TV programme 0568 TV "Electric drives – Motors".  
Electric drive control unit (power electronics)  
Introduction  
Power electronics have become an integral part of today’s electrical engineering. They have the task of converting electric energy  
using electronic components – be it from alternating voltage to direct voltage or vice versa. To be able to switch high three-figure  
ampere currents, power electronics are being further developed on a daily basis. There are two different versions of the electric  
drive control unit on the Audi etron GT (type F8). Each of the power electronics is connected to the vehicle body via a potential  
equalisation line.  
Electric drive control unit for front axle J1234 (300 A version)  
Electric drive control unit for front axle J1234 is bolted onto the electric drive motor. The contact between the control electronics  
and the electric drive motor is fixed.  
Contacts on front axle  
684_362  
Note  
Electric drive control unit for front axle J1234 must under no circumstances be opened.  
27  
How the system works  
684_359a  
Electric drive control unit for front axle J1234 converts direct voltage from the battery into three-phase alternating voltage for the  
electric drive motors. The direct voltage enters the power electronics via plug contacts. The electromagnetic compatibility filter en-  
sures that no interference from the switching impulses can be transmitted into the system as a whole. There follows a group of  
several intermediate circuit capacitors which provide a uniform amount of energy to the IGBTs (insulated-gate bipolar transistors).  
During recuperation, the condensers also smooth the voltage used to charge the battery. Converted voltage enters the motor via  
the IGBTs. Current sensors monitor the motor’s current draw on the alternating current and direct current side.  
300 A pulse inverter  
684_414  
28  
Electric drive control unit for rear axle J1235 (600 A version)  
Electric drive control unit for rear axle J1235 is bolted onto the electric drive motor. However, the contacts are different to those on  
the front axle. The current bridge consists of bus bars with flexible elements.  
Contacts on rear axle  
684_333  
Note  
Electric drive control unit for rear axle J1235 must under no circumstances be opened.  
How the system works  
684_359b  
Electric drive control unit for rear axle J1235 converts direct voltage from the battery into three-phase alternating voltage for the  
electric drive motors. As can be seen in the illustration, the design and functions of electric drive control unit for rear axle J1235 are  
practically identical to those on the control unit for the front axle. The only difference is that the number of IGBTs has been adjus-  
ted for the higher current. There are six power modules rather than three. The IGBTs are correspondingly connected together in  
parallel. Current sensors monitor the motor’s current draw on the alternating current and direct current side.  
The 300 ampere version is used on the Audi e-tron GT. On the RS e-tron GT, the 600 ampere version is used.  
29  
600 A power electronics  
684_416  
Networking/sensors  
The power electronics are connected to the FlexRay and the CAN bus via the 12 Volt communication connection. There is also an  
input from the gearbox speed sender (rear axle only) and terminals 30, 31 and 15. The resolver and the temperature sensor are  
also directly connected to the power electronics. The designations of the temperature sensors are rear drive motor temperature  
sender G1096 and front drive motor temperature sender G1093. On the high-voltage side, the power electronics have five connec-  
tions. Two of them are on the DC side (HV positive and HV negative for the high-voltage battery) and three are on the AC side  
(phase connections U, V and W).  
684_413  
Note  
If an electric drive motor or the power electronics are replaced in service, the new components must be adapted to  
each other. Please always refer to the current service literature.  
30  
Data processing  
684_003  
Key:  
Discrete wire  
FlexRay  
Bus bars  
31  
Driving dynamics  
Launch control  
A launch control system has been implemented for the Audi e-tron GT (type F8). This involves pre-tensioning the drive system when  
the brake pedal and the accelerator pedal are pressed at the same time.  
Creep response  
If the Audi e-tron GT (type F8) is on a level surface with a transmission position selected, the vehicle will begin to “creep”, as vehi-  
cles with an automatic gearbox do.  
Transmission position D/S  
There is no transmission position S on this vehicle project. The response of the electric drive motors is affected by the Audi drive  
select settings.  
Driving away on a slope  
When driving away on a slop without the brake or accelerator pedal pressed, the vehicle behaves differently depending on the sit-  
uation.  
Direction of travel  
uphill  
Transmission position  
Action  
D
R
D
R
Vehicle remains stationary  
Vehicle rolls backwards  
Vehicle rolls forwards  
Vehicle remains stationary  
uphill  
downhill  
downhill  
If the vehicle remains stationary in a specific situation (refer to table), the ESC (ABS control unit J104) controls this input. As soon  
as transmission position N is selected via the selector lever, the vehicle starts to roll.  
Recuperation settings  
The strength of recuperation in overrun mode (brake pedal and accelerator pedal not pressed) can be set via the paddle levers on  
the steering wheel. Two levels of different strengths can be selected. The first level is much more noticeable to the driver than  
level 2. The maximum recuperation under braking is approx. 265 kW.  
Coasting mode  
If the vehicle is in coasting mode, the motor is set to 0 torque. This means that the motor cannot provide motor power or act as a  
generator.  
Reversing  
When the vehicle reverses, the rotating magnetic field reverses the electric motor’s direction of rotation. This means that the mo-  
tor turns in reverse. The front motor is used as the main axle when reversing.  
Electronic engine sound  
Engine sound generator control unit 2 J1167 / engine sound generator control unit 3 J1177  
On the Audi e-tron GT and the RS e-tron GT (type F8), an exterior sound system is available as standard. An interior sound system is  
available as an option. A warning sound at low speeds is required by law and this requirement is met (in the basic version) by a  
single loudspeaker. The system is known as AVAS (acoustic vehicle alerting system). The loudspeaker is fitted in the front section of  
the vehicle. Customers can also choose additional equipment where an additional loudspeaker is fitted at the rear of the vehicle  
along with two loudspeakers in the vehicle interior. Engine sound generator control unit 3 J1177 is fitted as part of this additional  
equipment. The two loudspeakers in the vehicle interior are fitted in the rear left and rear right doors. They are additional loud-  
speakers. The two control units control the sound that is experienced on the basis of speed, load and the Audi drive select mode  
selected. The technical implementation of country-specific regulations may mean that the sound is perceived differently depending  
on whether the vehicle is driving forwards or reversing. Retrofitting the optional equipment is not permissible due to legal restric-  
tions.  
32  
Options in the EU:  
Drive select mode Front exterior  
loudspeaker  
Rear exterior loud-  
speaker (optional)  
Interior loud-  
speakers (op-  
tional)  
Speed  
efficiency  
X
Becomes quieter at 25 km/h and above, no longer  
audible at 60 km/h and above  
comfort  
dynamic  
X
X
X
Exterior up to 220 km/h  
Exterior up to 220 km/h  
X (louder)  
X
Interior up to 250 km/h  
684_114  
33  

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