Re: vfd load reactor suggestions?
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Hi Ross
All noted , and thanks for the sine filter link
My ¡°how it works¡± comments were directed more to Sierra
The theme of this discussion has been whether EMCO motors can be damaged by use with a VFD , and if so how to mitigate it
The Sine Filter option crept into the thread after Carl reported that after damaging two motors with his inverter , he had installed a sine filter and no further problems? . .? I agree that simpler things like a small inductor would help and that is how we got onto microwave oven transformers ?
Regards,
Carvel ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Morepork via groups.io
Sent: Monday, March 24, 2025 2:19 AM
To: [email protected]
Subject: Re: [emcoV10lathe] vfd load reactor suggestions? ? Thanks Carvel, but my question was to Sierra as to the problem he wants to resolve by using a load filter, not what this does.? I'm well versed in principles of filters (reactor/chokes, sine filters, dv/dt filter etc.) being formally trained in power electronics - though this was many years ago:) Why I asked Sierra this question is to try to understand if the filter will be used to allow the output from the VDF to be motor friendly, resolve issues with harmonics, or problems with cable resonance from long cable lenghts. This would help in deciding on what filter is require. Harmonics will require a sine filter but if you just need to knock of the voltage spikes and so they are not reflected back, thus protecting the motor and VFD, then cheap dv/dt (EMC) filter should work - maybe even just a small inductor could work. Try also to keep the load cable as short as possible.? There are are sine filters on Aliexpress if you want to go down that route.? Haven't used them so cant comment on their quality but they seem to be affordable. ?
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