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  1. e573

    About PWM motor testing and time-dependent process

    quotation Sorry, it is very difficult to understand what you are asking. quotation Why? And what particularly is difficult to understand? quotation Do you need data like power, current consumption, power factor etcetera vs speed for one and the same motor where the data has been obtained the...
  2. e573

    About PWM motor testing and time-dependent process

    Dear Sirs, Two question, if it's possible. 1. Motor can be supplied or directly through network (380 V), or through the frequency regulator. We have not enough experience in latter case, but if we apply directly MCSA approach for this case, the number of faults is relatively low. Do you have...
  3. e573

    Nonsinusoidal voltage and SMPS

    Dear Sirs, can you help me in questions of the influence of input voltage distortion (THD and odd and even harmonics) on SPMS operation? What levels of those quantities is acceptable? What harmful consequences is due to high voltage harmonic level? What literature (books, standards and...
  4. e573

    AC current & inner pipes corrosion

    Dear Rustbuster1, thank you very much for your answer. But what the physics principle do you mean, I am very interested to know them better. Thank you again.
  5. e573

    AC current & inner pipes corrosion

    We often see "pin holed" inner steel water pipes in buildings  (corrosion from the inner side of pipe). If it is possible, some questions on this item. 1.  Can the AC current on internal pipeline systems of buildings...
  6. e573

    "Pin hole" corrosion of inner water pipes

    Who can explane, why the inner water pipes in building became "pin-holed"? May it be due the AC electrical current flow on this pipes or exist another reasons? What must be done in this situation? Thanks in advance.
  7. e573

    50 HZ Magnetic field reduction

    Who can advise how to mitigate (or to shield) 50 Hz magnetic field? Thanks in advance

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