completelycharged
Active member
- Joined
- Mar 7, 2018
- Messages
- 1,083
Just realised - how do I move this post to the General Project thread ???
I have used a couple of Variable Frequency Drives with some 3 phase motors in the past and wondered why (appart from the high input voltage) they are never used as general purpose inverters if they are set with a fixed frequency output.
The inverters normally take 110V or 220V as input, pass through a bridge rectifier to DC and then re-output as an AC waveform.
I'm looking at an option of creating a large output inverter from cheap parts....
This is the outline....
Separate note : how can I set the image size in the post larger than default ?
I know the VFD units have feedback / detection for motors but if the output frequency is hard set should the unit at least output a steady AC waveform ?
Separately I have an existing machine with a 2.2kW motor that already has an inverter drive and plan on feeding this with the output from 2 UPS units as DC so that I can run it from my battery without having to get a separate >3kW inverter.
I have used a couple of Variable Frequency Drives with some 3 phase motors in the past and wondered why (appart from the high input voltage) they are never used as general purpose inverters if they are set with a fixed frequency output.
The inverters normally take 110V or 220V as input, pass through a bridge rectifier to DC and then re-output as an AC waveform.
I'm looking at an option of creating a large output inverter from cheap parts....
This is the outline....
Separate note : how can I set the image size in the post larger than default ?
I know the VFD units have feedback / detection for motors but if the output frequency is hard set should the unit at least output a steady AC waveform ?
Separately I have an existing machine with a 2.2kW motor that already has an inverter drive and plan on feeding this with the output from 2 UPS units as DC so that I can run it from my battery without having to get a separate >3kW inverter.