Measurement of vibration motors, diagnostics of the motor bearings

Elevated vibration motor is one of the main reasons for its premature failure, primarily bearings. In addition to bearings, excessive vibration quickly wears out the insulation of the windings can lead to break / bend the shaft, appearance of cracks and damages in the case, reference the frame or Foundation, etc.

Source of vibration motor origin klassificeret:

• Magnetic sources, due to: the presence of teeth on the stator and the rotor; the irregularity of supply voltage; eccentricity air gap; non-sinusoidal winding and MDS.

• Mechanical sources are caused by: errors the manufacture of parts and Assembly. The bearing defects, imbalance, misalignment seats, bearing, shaft deflection, misalignment of shafts, etc.), as well as thermal deformations of the rotor, etc.;

• Aerodynamic sources due to located on the rotor parts (fans, etc.).

Measurement of engine vibrations is performed the purpose of obtaining data on the characteristics of vibration and their subsequent comparison with valid values are regulated by GOST R IEC 60034-14-2008 (see Website Baltech).

Vibration measurements of bearings motors is carried out in the control points located in three mutually perpendicular planes located as close as possible to the axis of rotation of the rotor.

When you have a choice of installation method vibrator to the sample surface (the probe, a magnet, a pin is the best a threaded connection in which the pin is installed in the direction of measurement vibration. Also, be aware that the mass of the vibrator needs exceed 5% of the mass of the motor.

Measurement of vibration motors includes the definition of values vpromaster RMS (microns) RMS of vibration velocity (mm / s) or RMS acceleration in the frequency range from 10 Hz to 1000 Hz. For low-rpm motor speed at least 600 rpm the lower limit of the frequency range should not exceed 2 Hz. In the case asynchronous motors, which are characterized by the appearance of beats with a double frequency slip, the actual value of the measured parameter is calculated by the formula (see "Baltech).

Measurement of vibration motors, as generally held in the idling (unless otherwise specified in the motor) at a frequency of:

• rated speed - for singlemode motors;

• the rotation frequency with the highest vibration - for multi-speed motors;

• nominal and maximum frequency rotation - motors with variable speed.

Measurement of vibration motors quickly and easily done using portable vbroker Baltech - vproduct BALTECH VP-3405-2 or Vibrometer BALTECH VP-3410 and for help the vibration meter-balancer "PROTON-II-Balance" can still hold and balance of the motor shaft in its own bearings. All vibration meters Baltech match the requirements of GOST ISO 10816-1-97 and are recommended professionals who trained on the course THOR-103 fundamentals of nondestructive testing at the Training center Baltech.

Measurement of vibration motors, diagnostics of the motor bearings is a simple task for our service engineers of maintenance Department. We leave on the objects to diagnosis - round the clock and in any region of Russia, Kazakhstan and CIS.