Compressor/turbine gap, revolutions

When parts are rotating, their speed can always be measured. Speed sensors which are directly attached to the shaft are usually suitable for this. If this is not possible, other measuring principles must be used where, e.g. the rotating part is measured on the front side. In order to reliably measure the speed in this arrangement, defined points per revolution must be measured. Eddy current sensors, capacitive and laser sensors are used for this.

Sensor technology applied

Turbolader

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Turbochargers

Apart from the angle of the guide vanes, the speed of the vanes on the turbine wheel is important for the performance of the turbocharger. The rotation of the vanes is measured on the face side for this. Due to increasing material stresses and speeds besides aluminum, titanium vanes are now being used, which presents a challenge in terms of measurement technology. Titanium is a very poor electrical conductor. Therefore, eddy current sensors cannot be used easily on titanium. With varying speeds from 200 to 400,000 rpm, it is extremely difficult to measure these precisely. However, using special linearization and an advanced electronics system, Micro-Epsilon is able to precisely measure this speed on aluminum and titan vanes over the whole speed range.