BMW I01, Информация о продукте

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I01�High-voltage�Components
4.�Electrical�Machine�Electronics
66
Index Explanation
A Schematic�illustration
B Schematic�diagram�with�components
1 High-voltage�battery
2 Operating�mode�as�inverter,�electrical�machine�works�as�an�engine
3 Operating�mode�as�rectifier,�electrical�machine�works�as�an�alternator
4 DC/AC�converter
5 Current�sensors
6 Electrical�machine
The�operating�mode�of�the�DC/AC�converter�is�defined�by�the�EME�control�unit.�The�EME�control
unit�also�receives�the�setpoint�values�(essential�input�variables)�from�the�EDME�control�unit�for�which
torque�(amount�and�sign)�the�electrical�machine�should�supply.�From�this�setpoint�value�and�the
current�operating�condition�of�the�electrical�machine�(engine�speed�and�torque)�the�EME�control
unit�determines�the�operating�mode�of�the�DC/AC�converter,�as�well�as�the�amplitude�and�frequency
of�the�phase�voltages�for�the�electrical�machine.�According�to�these�specifications,�the�power
semiconductors�of�the�DC/AC�converter�are�activated�in�sync.
In�addition�to�the�DC/AC�converter,�the�power�electronics�also�contains�current�sensors�in�all�three
phases�on�the�AC�voltage�side�of�the�DC/AC�converter.�Using�the�signals�from�the�current�sensor,�the
EME�control�unit�monitors�the�electrical�power�which�is�used�in�the�power�electronics�and�electrical
machine�and�what�torque�the�electrical�machine�generates.�The�control�loop�of�the�electrical�machine
electronics�is�closed�by�the�signals�of�the�current�sensors�and�the�rotor�position�sensor�in�the�electrical
machine.
The�performance�data�of�the�electrical�machine�electronics�and�the�electrical�machine�are�coordinated
in�development.�The�electrical�machine�electronics�must�be�able�to�provide�continuous�electrical
power�of�75 kW�and�supply�a�maximum�power�of�125 kW�for�a�short�time.�In�order�to�avoid�overloading
the�power�electronics,�there�is�also�another�temperature�sensor�at�the�DC/AC�converter.�If�an�excessive
temperature�of�the�power�semiconductor�is�identified�using�this�signal,�the�EME�control�unit�reduces
the�power�delivered�to�the�electrical�machine�in�order�to�protect�the�power�electronics.�The�customer
is�informed�via�a�Check�Control�message�in�the�case�of�a�noticeable�power�reduction.�The�customer
receives�the�same�error�response�(power�reduction)�and�the�same�Check�Control�message�if�the
temperature�of�the�electrical�machine�exceeds�the�permissible�range.
Check�Control�symbol�for�power�reduction�due�to�high�temperature�of�electric�motor�components