BMW I01 Product Information page 170

I01￿High-voltage￿Components
11.￿Cooling￿the￿Electrical￿Machine
Components
Index
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
The￿components￿to￿be￿cooled￿are￿switched￿in￿the￿cooling￿circuit￿so￿that￿the￿maximum￿temperature
levels￿required￿are￿observed.￿A￿lower￿temperature￿is￿required￿for￿the￿electrical￿machine￿electronics
than￿for￿the￿electrical￿machine,￿which￿is￿why￿the￿series￿connection￿in￿this￿sequence￿was￿chosen.￿As
the￿electric￿motor￿and￿the￿convenience￿charging￿electronics￿are￿not￿operated￿at￿the￿same￿time,￿the
parallel￿circuit￿was￿chosen.￿The￿range￿extender￿electrical￿machine￿and￿the￿range￿extender￿electrical
machine￿electronics￿are￿switched￿initially￿in￿series.￿As￿these￿two￿components￿are￿operated￿at￿the
same￿time￿as￿the￿convenience￿charging￿electronics￿and￿the￿electrical￿machine￿electronics,￿they￿were
switched￿in￿parallel￿to￿these.￿In￿addition,￿the￿cooling￿system￿is￿therefore￿not￿designed￿for￿the￿sum￿of￿all
heat￿outputs,￿because￿in￿reality￿heat￿only￿has￿to￿be￿discharged￿in￿one￿or￿two￿of￿the￿parallel￿branches.
If￿the￿vehicle￿is￿equipped￿with￿a￿range￿extender,￿in￿the￿cooling￿circuit￿there￿is￿a￿coolant-coolant￿heat
exchanger￿for￿cooling￿the￿W20￿engine.
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Explanation
Radiator
Electric￿coolant￿pump￿(80 W)
Electrical￿machine￿electronics￿(EME)
Electrical￿machine
Convenience￿charging￿electronics￿(KLE)
Range￿Extender￿Electrical￿Machine￿Electronics￿(REME)
Range￿extender￿electrical￿machine
Mechanical￿coolant￿pump
Additional￿electric￿fan￿for￿range￿extender￿cooling￿unit￿(coolant-refrigerant￿heat
exchanger)
Engine￿oil-to-coolant￿heat￿exchanger
Range￿extender￿for￿W20￿engine
Coolant￿temperature￿sensor
Expansion￿tank￿in￿the￿cooling￿circuit￿of￿the￿combustion￿engine
Thermostat
Coolant-refrigerant￿heat￿exchanger￿for￿range￿extender
Scope￿is￿only￿installed￿for￿equipment￿with￿range￿extender
Expansion￿tank￿in￿the￿cooling￿circuit￿of￿the￿electric￿motor￿components
Electric￿fan￿for￿the￿radiator