When a rotating body revolves, the unbalance causes dynamic forces; resulting in low efficiency, high bearing loads, wear and noise. At the same time, hazards arise for people, machines and the environment. Therefore, balancing is necessary for modern machines running at high rotational speeds and/or requiring high precision. During the balancing process, changing the mass distribution reduces the forces reduces the vibrations to permissible limits.

Electric drive systems for vehicles increasingly become the focus of public attention. Challenges accompany the new possibilities offered by electro mobility; effecting both manufacturers and suppliers. High operating speeds at low unbalance tolerances (increased requirements for low-vibration running rotor behaviour) require precise and reliable rotor balancing.

Depending on the type of rotor, different approaches required for balancing the parts/components. For rigid rotors with dynamic unbalance, two axial planes are common to balance the part. For many disc-shaped rotors such as grinding wheels, fans or turbochargers, balancing in one plane suffices. Flexible rotors that run near or pass critical speed ranges during operation usually balanced in more than two planes at various rotational speeds using special methods. Learn more in our product groups:

In order to ensure smooth operations, safety and longevity of the rotors, special applications such as rotor spinning may be mandatory. Depending on the design and condition of the rotors, the initial run-up of the rotors to operating speed can result in an unbalance change due to the settling behaviour of the laminations or the potted magnets. The resulting unbalance may be many times the actual part tolerance.