In the diagram, the speeds at the electric motor, at the gearbox output and at the intermediate shafts are recorded in high resolution.

The clock frequency of the ROTEC speed card is 12.3 GHz. This allows the torsional vibration of the shafts and the angle of twist between two shafts to be measured in the µrad range. The transmission error (TE) of the gears is thus displayed with maximum accuracy.

This parameter is important for describing the excitation of the transmission whine (GWN) and is indispensable for a deeper understanding of NVH behaviour.

At the same time, structure-borne sound signals are recorded with an accelerometer and microphones and then analysed together in the order and frequency ranges. We use high-precision HV measuring probes from our partner company KLARIC to measure electrical variables such as currents and voltages.

With a lower weight, it promises more power and range.
The three drive components - electric motor, gearbox and power electronics - are combined into one compact unit in the electric axle drive.

Due to the limited installation space, the individual components of the entire drive unit must be optimally harmonised in terms of strength, weight and sound transmission.

Otherwise, audible and perceptible vibrations can occur, which affect driving comfort. The investigation of torsional vibrations in the electric axle drive is therefore fundamental to the analysis of noise excitation and NVH (noise, vibration, harshness) behaviour.

ROTEC ENGINEERING also supports you with specialist engineering expertise in all aspects of vibration analyses on engines, transmissions and drivetrains. With our expertise, we make a valuable contribution to your product in the areas of timing drive validation, valve train optimisation, clutch design, transmission errors (TE), gearbox and oil balance optimisation, drivetrain measurement and optimisation, current and voltage analysis and the application of measurement technology.