Metrology for e-mobility

The development of electromobility places increasing demands on quality assurance. With regard to electric cars, compliance with very tight tolerances vis-à-vis surface, contour and shape becomes even more important, as these directly affect the noise development and efficiency of the vehicle. High-precision measuring instruments can help to increase efficiency, thereby providing a competitive advantage.

E-Mobility: Range thanks to high surface quality

Shafts and ball bearings in electric cars, for example, need to have an extremely high surface quality to prevent vibrations and keep noise to a minimum. The background noise that the rather noisy conventional combustion engine has masked to date would be noticeable immediately with the extremely quiet electric motor.

Increasing the battery range is at the heart of e-mobility. Lightweight construction increases the range of electrified vehicles, which is why ever greater importance is being attributed to small and lightweight parts with high surface quality and strength.

Improved production methods such as superfinishing enable high-precision surfaces.

Surface conditions such as roughness and material contact ratio affect the quality of the electric motor components. In this regard, waviness in rolling elements and bearing rings can cause frictional loss as well as noise. The SURFCOM NEX and SURFCOM CREST surface measuring instruments allow you to measure surfaces with an accuracy of up to ±(0.8+|2H|/100) µm.

Increased efficiency through compliance with tight shape tolerances

In addition to the surface, the tolerances of shapes are also becoming smaller and smaller in order to increase the efficiency of the electric car. Specifically in relation to components such as bearings and axles, which require high running characteristics, the need for shape deviations such as roundness, straightness or cylindricity increases considerably. Reducing deviations from shape and concentricity tolerances for the most part, thereby avoiding friction has a positive impact on the electric car’s range. High-precision measurement of concentricity and shape tolerances can therefore lead directly to a competitive advantage.

The RONDCOM NEX series makes it possible to measure all shape deviations in the most precise measuring range. The RONDCOM NEX RS series of shape measuring instruments offer the possibility of taking high precision measurements of the shape and surface parameters at the same time, in accordance with ISO standards. With a rotational accuracy of (0.02+3.2H/10,000) µm, these instruments provide the greatest rotational accuracy in their class. Due to the newly developed and extremely low-noise air-bearing concept, it is possible to measure roughness with measurement precision that could previously only be achieved with special roughness measuring instruments. This means there is no need to purchase two measuring systems or change over from one measuring system to the other.

High-precision surface and shape measurements contribute to increased efficiency in electromobility, which, in turn, provides a competitive advantage. ACCRETECH offers the requisite shape and surface measuring instruments. These are ideally suited for the increasing requirements thanks to their high precision. ACCRETECH measuring instruments win plaudits for their extremely reliable, durable technology that is almost maintenance-free. We would be happy to discuss them with you!


Juergen Horst
Director Product Group Metrology
Phone: +49 89 546788-24