BMW N55 User Manual

52
N55 Engine
Valvetronic Servomotor
A brushless direct current motor (BLDC motor) is used. The BLCD motor is mainte-
nance-free and very powerful, due to the contactless energy transfer system. The use of
integrated electronic modules ensures precision control.
The Valvetronic servomotor has the following special features:
• Open concept (engine oil is directly supplied to the motor).
• The eccentric shaft angle is determined by angle increments from the integrated
sensor system.
• Power consumption is reduced by about 50%.
• Higher actuating dynamics (e.g. cylinder-selective adjustment, idle speed control,
etc.).
• Lightweight design is approximately 600 grams.
Function
Actuation of the Valvetronic servomotor is limited to a maximum of 40 amps. A maximum
of 20 amps are available over a period of > 200 milliseconds. The Valvetronic servomotor
is actuated by a pulse width modulated signal. The duty cycle is between 5% and 98%.
Index Explanation Index Explanation
1
Socket
6
Rotor with four magnets
2
Worm shaft
7
Sensor
3
Needle bearing
8
Stator
4
Bearing cover
9
Housing
5
Magnetic sensor wheel
10
Bearing

BMW N55 Specifications

General

Brand	BMW
Model	N55
Category	Engine
Language	English