BALANCING OF ELECTRIC MOTORS - SMOOTH RUNNING AND LONG LIFETIME AT INCREASING SPEEDS

There are numerous designs, sizes and applications of electric motors - for very many of them the requirements are becoming increasingly tough. Motors of the same or smaller size are expected to deliver ever higher performance by increasing speed, while producing less noise and at the same time lasting longer. Electric motors are also increasingly used in quiet environments. Gas heaters in the corridor, PCs and game consoles in the living room and also in the car, the combustion engine is less and less often covering the electric motor in terms of sound. In industrial plants, quiet running means operator protection and ultimately conveys higher quality.

The influence of balancing is becoming more important in this environment. Current balancing specifications of some electric motors were called ultra-precision just a few years ago, but today it is becoming standard.

Electric rotors are often balanced as individual parts before being completed with bearings and installed in the motor housing. But especially with small and fast rotating electric motors this is often not sufficient to ensure the requirements for smooth running. Pressing on the bearings and mounting tolerances that cannot be further reduced during installation in the motor housing again introduce imbalance into the motor.