#11
|
|||
|
|||
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
__________________
Richard Ott |
#12
|
||||
|
||||
What is the "Harmonic Voltage Problem"?
__________________
Richard K |
#13
|
|||
|
|||
John, I Googled the quotation and this is a corresponding link:
http://www.plumbingengineer.com/july...er_feature.php
__________________
Manny Remember that the best of men, are only men at best. |
#14
|
|||
|
|||
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.
__________________
Richard Ott |
Thread Tools | Search this Thread |
Display Modes | |
|
|