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  #11  
Old 07-29-2013, 10:15 PM
Richard O Richard O is offline
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Bob - Brushes on a shaft would work for the harmonic voltage problem.

Kerry - Your right on!


Damage generally occurs on the continuous use applications. If the machine is used continuously install a VFD rated motor
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Old 07-30-2013, 12:22 AM
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Richard K Richard K is offline
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What is the "Harmonic Voltage Problem"?
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Old 07-30-2013, 07:41 AM
metal manny metal manny is offline
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John, I Googled the quotation and this is a corresponding link:


http://www.plumbingengineer.com/july...er_feature.php
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Old 07-30-2013, 11:45 PM
Richard O Richard O is offline
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Richard K

In the electrical trade we typicaly refer to "harmonics" as significant unwanted voltage/currents generated at frequencies outside of the nominal 60 hertz.
Many Variable Frequency Drives (VFD) induce significant voltage onto the rotor/shaft of the driven motor, because of the kilohertz switching of the insulated gate bipolar transitors (IGBTs), which produce the pulse width modulatation used to control the motor speed. The presence of high frequency ground currents can potentially cause arcing and can damage bearings.
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