Valvetronic Servomotor; Function - BMW N55 Manual

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
1
2
3
4
5
Magnetic sensor wheel
52
N55 Engine
Explanation
Socket
Worm shaft
Needle bearing
Bearing cover
Index Explanation
6
Rotor with four magnets
7
8
9
10
Sensor
Stator
Housing
Bearing