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Model 4008RJ
4008RJ Automatic Rotor tester is the most reliable, fast and cost-effective way to detect faults in the rotors.
The Latest Rotor tester detect faults in rotors such as broken & shorted bars, air porosity, interrupted bars, missing ring connections and deviation in skew angles.

  • User friendly front panel controls
  • Fast and easy operation
  • Pnuematic cylinders to load and unload the rotors of varying inner and outer diameters
  • Adjusting probe for changes in the outer diameter of rotor and also for skew angles
  • Bright and sharp Monitor for waveform display

    4008RJ is ideally suited to test the rotors of varying inner and outer diameters :
     Inner Diameter:10mm – 30mm
     Outer Diameter:40mm – 100mm
     Stack Length:50mm – 180mm

    Principle of Rotor Testing
    The Rotor tester uses the principle of electrical and magnetic effects caused by the circulation of induced currents into the bars of a rotor, which is made to turn at a constant speed, with in a magnetic field produced by a permanent magnet. The induced magnetic field produced by permanent magnet, acts on one slot at a time. The direction of magnetic field is such that the turns of a moving rotor cut the lines of force normally.
    The induced currents, which are proportional to the field intensity (distance of magnet from the rotor, on the speed of rotation constant) & on the rotor characteristics, produce magnetic fields, the symmetry of which enable a clear observation of the turns in the short-circuited condition. A fixed probe subjected to the magnetic fields produced by the rotor under test, provides the signals, which after being amplified, are applied to the monitor.
    The synchronized sinusoidal wave pattern from the rotor bars is displayed on the monitor screen. The waveform identifies typically occurring faults in the rotor bars & there is a distant correlation between the result of the inductive test of the rotor bars & the starting torque of a motor.
    The waveform pattern of Good and Defective rotor are shown below respectively :
    Wave Pattern of a Good Rotor
    Wave Pattern of a Bad Rotor

    Adjustment of Pnuematic Cylinders
    Adjustment of Probe

    Display Monitor (Adjustable vertical gain)
    Operating Frequency 50Hz ± 3%
    Operating Voltage 230V ± 10%
    Weight 90 kgs (225lbs)
    Power Consumption 250 Watts
    Physical Dimensions (WXHXD) 1042 X 1050 X 405
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