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  • Users: dazhoid
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  1. dazhoid

    Iron losses and rotor teeth number

    Hi, Is it possible to make a general rule on the evolution of the total iron losses of a squirrel-cage induction motor with its rotor teeth number Nr ?? (in two cases: 1-considering that the rotor slot shape remains unchanged, which makes the rotor teeth section decrease when Nr increases, and...
  2. dazhoid

    effect of skew on load angle

    Hi, After my question on the influence of skewing on saturation, another question has came to me : what is the influence of skewing on the load angle of an induction machine ? We usually think in 2D, where the load angle is the phase angle between stator and rotor mmf, but when the rotor is...
  3. dazhoid

    skewing and saturation

    Thanks. I assumed there was higher saturation because a vibration saturation harmonic was much higher...
  4. dazhoid

    skewing and saturation

    Hi, I have a 250 kW induction motor which has a high saturation level since rotor was changed from a non-skewed to a skewed one (one slot pitch)... Is there a correlation between saturation and skewing ?? Thanks for your answers,
  5. dazhoid

    RBPF line : an aerodynamic problem ?

    I don't know why the fan has been made switchable, but it blows air on the inside of the motor through the airgap, rotor and stator ventilation channels in order to cool windings, rotor and stator cores. This is a vfd fed machine, but tests were run in sinusoidal supply (provided by an...
  6. dazhoid

    RBPF line : an aerodynamic problem ?

    Hi, I have a noisy squirrel-cage induction machine with a 115 dB line at Rotor Bar Pass Frequency (f*Zr/p where f is fundamental current frequency, Zr number of rotor bars, and p number of pole pairs) in off-load sinusoidal running conditions. That sharp peak decreases to 90 dB when using the...
  7. dazhoid

    How to generate a random frequency signal ?

    Hello I am trying to generate in Simulink a random frequency triangle of period T, T being a uniform random number in [T1 T2] for instance. What is the easiest way to realize that ? I wanted to use an integrator, but I can't make the random slope input which is a random signal of value T...

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