Characteristic curve and setpoint values

The power of the starter motor generator is dependent on speed and temperature. The following shows a sample characteristic curve for the nominal voltage of 13.5 V.

Fig 1: Starter Motor Generator Characteristic Curve

Courtesy of BMW OF NORTH AMERICA, INC.

Index	Explanation
1	Power
2	Characteristic curve 25 °C
3	Characteristic curve 80 °C
4	Characteristic curve 100 °C
5	Characteristic curve 120 °C
6	Rotational speed

Observe the following setpoint values for the starter motor generator:

Size	Value
Voltage range	6 to 16 V
Data transfer rate on serial data interface LIN	19200 s
Maximum temperature of the stator winding	205 °C
Maximum speed	20000 rpm
Temperature range of controller	-40 to 150 deg C