I01�High-voltage�Components
3.�Electric�Motor
22
The�electrical�machine�is�designed�for�a�large�temperature�range.�The�coolant�can�reach�a�temperature
of�up�to�70 °C�at�the�input�(supply).�And�although�the�electrical�machine�demonstrates�less�losses
during�energy�conversion�than�a�combustion�engine,�its�housing�can�absorb�a�temperature�of�up�to
100 °C.
Danger�of�injury:�The�housing�of�the�electrical�machine�can�absorb�temperatures�of�up�to�100 °C
during�operation.�A�sufficiently�long�time�must�be�waited�for�cooling�if�work�is�to�be�performed,�for
example�the�removal�of�the�drive�unit.
Sensors
In�order�to�avoid�damage�to�the�components�due�to�the�high�temperature,�there�are�two�temperature
sensors�in�the�electrical�machine�of�the�I01.�Both�temperature�sensors�are�located�in�the�coils
of�the�stator.�The�temperature�of�the�rotor�is�not�measured�directly,�but�can�be�determined�from
the�measured�values�of�the�temperature�sensors�in�the�stator.�The�two�temperature�sensors�are
temperature-dependent�resistors�of�type�NTC.�Their�signals�are�read�in�and�evaluated�analogically�by
the�electrical�machine�electronics.
So�that�the�voltages�for�the�coils�in�the�stator�can�be�correctly�calculated�and�generated�by�the
electrical�machine�electronics�in�terms�of�amplitude�and�phase�layer,�the�precise�angle�setting�of�the
rotor�must�be�known.�This�is�why�there�is�a�rotor�position�sensor�at�the�end�of�the�drive�shaft,�which�is
turned�away�from�the�transmission.
Electrical�connections�of�the�electrical�machine
