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KD719 · Electromechanical Vibrations

Electromechanical vibrations experiment - interaction of electromagnetic and mechanical systems in an asynchronous motor

Experiments
  • Influence of the stator-rotor gap on vibration behaviour - adjustable asymmetry up to 0.2 mm
  • Influence of electromagnetic asymmetry (winding that can be switched off) on vibration behaviour
  • Influence of mechanical load on the vibration level (with KD705)
  • Influence of the gap on electromagnetic losses and motor efficiency
  • Influence of speed on the vibration behaviour of the motor
  • Measurement of current consumption per phase (with a current probe - not included)
  • Interpretation of frequency spectra - separating rotational (n, 2n) from electromagnetic (2fe, 4fe) contributions
  • Works together with the KD700 base unit
KD719
Description
    Asynchronous motors are the most common drive in industry, and their vibration spectrum mixes purely mechanical contributions with those originating from the magnetic field. The KD719 experiment isolates these effects: an adjustable centring device introduces a controlled asymmetry in the stator-rotor gap, while a switchable winding introduces electromagnetic asymmetry. Loaded via the KD705 brake, the motor reveals how each imperfection maps to its own lines in the spectrum.
KD719 electromechanical vibrations experiment - schematic
Current-probe tap (3 phases)
Bearing cover with centring & scale (gap adjustment)
Motor shaft
Connection to KD700 display & control unit
Adapter for acceleration sensors
KD719 electromechanical vibrations experiment - schematic
Current-probe tap (3 phases)
Bearing cover with centring & scale (gap adjustment)
Motor shaft
Connection to KD700 display & control unit
Adapter for acceleration sensors
Specifications
    Motor asynchronous, variable speed via frequency converter of KD700
    Speed range 100…6000 min⁻¹
    Nominal power output 370 W
    Gap asymmetry adjustable armature eccentricity 0…0.2 mm with graduated scale
    Electromagnetic asymmetry winding that can be switched off
    Loading requires KD705 brake & load unit
    Instrumentation speed and power displayed on KD700 control unit; current probe optional
    Storage 400 × 300 × 320 mm stackable case with foam inlay
    Weight approx. 11 kg

Part of package

Machinery Diagnostics Lab

KD700 KD705 KD710 KD711 KD712 KD713
KD714 KD715 KD716 KD717 KD718 KD719

A modular training system for vibration measurement and condition monitoring of rotating machinery. Built around the KD700 base bench, it covers rotor dynamics, coupling and bearing faults, belt drives, gears, cavitation, fan and motor vibration through interchangeable experiments.

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