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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Singing VFD
I have two different VFD's. Both turn a motor (different motors) just
fine. One is completely silent (TECO), the other one makes a noticeable and irritating whine (actually the motor makes the noise). The noise is coming from the PWM in the drive. I haven't tried every PWM frequency, but I have tried about a dozen. They all whine until I get up to 16kHz, where I don't hear it. This would be fine except that above 12kHz the drive is only rated at 80% (2.4HP); I intended to run a 3HP motor with it. The noisy VFD is a 3HP Cutler Hammer that I just bought. I have it set up for test with 4' of Romex connecting between the VFD and a 3HP motor. The motor is grounded to the VFD and has no load. I would appreciate suggestions on how to quiet the drive but keep the PWM frequency at 12kHz or below. Will a load change things? Will a different motor change things? Thanks, Steve Smith |
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