Rotor balancing system

For the purpose of rotating parts balancing in manufacturing scale, it is necessary to conduct measurements with the minimum possible participation of the operator. The Rotor balancing system is intended for measurements related to rotating parts balancing in automated mode.

Application spheres

  • Pulley wheel balancing

  • Gear wheel balancing

  • Electrical motor armature balancing

  • Fly wheel balancing

  • Reel balancing

  • Crank shaft balancing

Operating principles

The main functional components of the system are listed below:

  • RPM sensor (e.g., BC 401);
  • accelerometer (e.g., BC 110 or BC 111);
  • FFT Spectrum Analyzer (e.g., ZET 017-U2).

Accelerometer, stationary element to be balanced and RPM sensor are interconnected with each other by means of a platform with mounting fixtures.

Rotor balancing system: components layout

Rotor balancing system_components layout

1 – accelerometer,
2 – rotating disk of the part to be balanced,
3 – stationary casing of the device to be balanced,
4 – common platform,
5 – light-reflecting mark,
6 – RPM sensor,
7 – mounting fixture for RPM sensor; the red arrow shows disk rotation direction (clockwise).

Then the sensors are connected to the FFT Spectrum Analyzer. FFT Spectrum Analyzer is used for digital processing of the signals received from the sensors.

Evaluation of unbalancing parameters is performed by the programs from the scope of ZETLAB software package. The program “Electrical machine rotor balancing” allows to conduct measurements in automated mode and to produce test reports (the program is implemented in a graphical programming environment ZETVIEW). When this program is used, there is no need to make any additional filtration or signal processing.

Balancing of electric machine rotors

The program Electrical machine rotor balancing is using RPM sensor and accelerometer signals for calculation of the following parameters:

  • rotation frequency, rpm;
  • unbalance value, gr×cm;
  • unbalance plane angle in relation to the light-reflecting mark.

The angle of average unbalance is depicted in the program as “Unbalance angle”. The unbalance angle is calculated in degrees from the center of the light-reflecting mark to the opposite side of the balanced item rotation.

The unbalance value is evaluated in standard measurement units gr×mm or  gr×cm (depending on the requirements of a particular facility).

The measurements results are saved into the log.


A detailed user manual on installation of the sensors, signals processing and unbalance parameters evaluation is available in the article “Measurements of the unbalances”.

Advantages of the system

Automation of measurements

fast measurements with the minimum possible involvement of operator

Signals from the sensors

do not require filtration or any other processing

Scalable program

can be configured in accordance with the requirements of particular facility

Automated report

contains the measurements results

System components

The price of the system depends on the particular configuration

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