Component Description For Electric Motor - GF08.10-P-1000KJE
ENGINE 780 in MODEL 453.091/391/491
Location
The electric vehicle drive motor is located below on the vehicle on the rear axle and is installed crosswise to the direction of travel together with the transmission.
Task
During vehicle operation, the electric vehicle's drive motor transforms electrical energy into mechanical rotation energy to drive the vehicle.
During regenerative braking, electrical energy is generated from mechanical energy.
Structure
The electric vehicle drive motor is a 3-phase AC synchronous motor. The transmission is installed on the left side of the motor when the observer is facing in the direction of travel. The motor shaft is designed as a hollow shaft. The right drive shafts leads through the motor shaft from the transmission to the right rear wheel. Voltage supply or recovery is carried out via the power electronics control unit (N129/1). A sensor for sensing the position and the turn rate as well as two temperature sensors for redundant acquisition of the coil temperature are integrated in the electric motor. The sensor signals are also evaluated by the power electronics control unit. The electric vehicle drive motor is not integrated into the coolant circuit but is cooled over the electric vehicle drive motor fan (M46).
Design of a synchronous motor
Function
The power electronics control unit supplies the coils in the stator with three-phase AC current. The AC generates a rotating magnetic rotary field in the stator.
The rotor is fitted with wound coils. The power supply to the coils takes place over slip rings and carbon brushes.
The rotary field of the stator acts on the magnetic field of the rotor generated by the rotor coils.
The rotor synchronously follows the rotation of the magnetic field and turns itself and the motor shaft.
The electric motor can be operated in both directions of rotation (for forward/reveres motion). Via the transmission, which is designed as a single-stage differential, the engine speed is reduced and half of the torque is conducted to both the left and right drive shafts.