VFDs, Motors, and Single Conductors
■ In addition to safety issues (see Southwire application note number 2012, VFD Cables – A Safe Bet), electromagnetic coupling can cause issues with drive performance. Electromagnetic coupling, also known as inductive coupling, is a phenomenon that takes place in electrical circuits where the electromagnetic field in one conductor results in an electrical charge in another. It transfers electromagnetic properties from one cable to another and occurs without physical contact taking place. For electromagnetic coupling to take place, there must be a change in the electromagnetic field. Direct current (DC) circuits, which have no variation in the electromagnetic field, are immune to this effect. The amount of electromagnetic energy generated is proportional to the square of the frequency. The high frequency, pulse width modulated (PWM) waveforms generated by today’s drives have significant energy and can cause serious issues. The longer the distance cables are run together, the more severe the issue can be.
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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12/12/2019 |
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