BMW I01, Информация о продукте

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I01�High-voltage�Components
9.�Range�Extender�Electrical�Machine
145
The�electrical�machine�is�designed�for�a�large�temperature�range.�The�coolant�can�reach�a�temperature
of�up�to�70 °C�(158�°F)�at�the�input�(supply)�at�a�flow�of�six�liters�per�minute.�The�temperature�at
the�input�is�time-restricted�and�can�rise�up�to�85 °C�(185�°F).�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�(212�°F).
The�two�connections�for�the�coolant�lines�integrate�the�range�extender�electrical�machine�in�the
cooling�circuit�of�the�electric�motor.�This�is�described�in�the�chapter�"Cooling�of�electric�motor
components".�The�graphics�in�this�chapter�show�the�range�extender�electrical�machine�and�the�W20
engine�without�coating.�In�the�production�vehicle�sometimes�these�components�are�still�covered�by�a
foam�part.�This�serves�for�the�acoustic�encapsulation�of�the�range�extender�components�and�absorbs
noises�which�the�customer�may�find�irritating.
The�housing�of�the�range�extender�electrical�machine�is�airtight�and�waterproof.�A�vent�line�is�required
to�prevent�water�(resulting�from�temperature�changes�and�thus�possible�condensation�of�air�humidity)
collecting�inside�the�range�extender�electrical�machine.
9.3.2.�Sensors
Temperature�sensor
In�order�to�avoid�damage�to�the�components�due�to�the�high�temperature,�there�is�a�temperature
sensor�in�the�range�extender�electrical�machine�of�the�I01.�The�temperature�sensor�is�a�temperature-
dependent�resistor�and�is�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�signal�is�read�in�and�evaluated�analogously�by�the�range�extender�electrical�machine
electronics.
Rotor�position�sensor
The�rotor�position�sensor�cannot�be�replaced�in�Service �