Milligram precision

Micro Präzision Marx GmbH in Erlangen offers a horizontal balancing machine for testing the quality of small components that is specifically geared to the needs of such test subjects. Registering the slightest imbalance also means that the measuring pressures are very small, which is why every element within such test procedures must be adjustable to a high degree of precision. This is the only way to capture accurate data. With this in mind, the Erlangen-based balancing experts rely on FAULHABER motors for their drives.

Universal means special

There are many small rotating parts that have to be balanced: from rotors inside small motors and micromotors to ­ventilator drums and special rotating test mounts. This gives rise to a broad range of different shapes, sizes and speeds. The problem starts with even the "simple" rotors of electric motors, also known as armatures. Whilst wire-wound DC ­armatures made of dynamo sheet are non-magnetic, the armatures of modern, brushless DC-Drives definitely require an antimagnetic testing device. Eddy ­currents caused by ill-positioned metal parts also impair the testing procedure. This is where specialist expertise is called for. After all, these small parts require the highest degree of balancing precision, down to an accuracy level of a tenth of a milligram. The particular shape of the ­balancing machine is designed to deal with all possible types of test pieces, while special controls ensure the test conditions are exactly the same for every test piece within a product line. After all, every ­two-gram rotor of a micro turbine ­running at 400,000 rpm must be able to be ­balanced perfectly every single time. ­Highly accurate oscillation sensors ­combined with precise evaluation provide a solid basis for accurate readings. It is clear that such measurements can only be as accurate as the driving motor permits. Synchronisation, high speed and very good adjustability are the key things here.