pugman
Active Member
Posts: 22
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Post by pugman on Sept 29, 2023 17:33:11 GMT
Hi, I just purchased an older warco KF milling machine with power feed. This is a three phase machine. Power goes into a junction box on the machine and power is then send to the milling motor and the power feed motor. The motor plate reads 3 phase 440v, 4 pole 50HZ . The motor also as a slow and high speed switch, along with the power feed motor. Would I be able to run these motors from a single to three phase inverter. Thanks
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Post by houstonceng on Oct 4, 2023 19:21:19 GMT
The majority of single to 3-P inverters (also called VFDs) can only be used with Delta connected motors as they provide 3P at 230v. There were some 240v to 440v inverters offered a few years ago, but they were (illegally) modified 440v in / 440v out units. The problem you have with a two speed 3P motor is that it usually cannot be connected in delta format, so it needs 440v 3P. You could run the mill using a rotary converter (ie a static converter with a pilot motor).
If you have an inverter, you probably could swap out the motors for ones that can be delta connected as you can vary the speed from half to twice the normal 50Hz speed.
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pugman
Active Member
Posts: 22
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Post by pugman on Oct 8, 2023 11:26:50 GMT
Thanks
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millman
Part of the e-furniture
Posts: 325 
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Post by millman on Oct 9, 2023 17:54:09 GMT
Don’t know about inverters but you should be able to run it off a rotary phase converter. I have a Britan turret lathe with a two speed 3 phase motor running the spindle and a much smaller 3 phase motor running coolant pump and hydraulic pump, I am running it from a Transwave rotary phase converter and it runs it without any problems.
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Post by houstonceng on Oct 10, 2023 14:48:01 GMT
Don’t know about inverters but you should be able to run it off a rotary phase converter. I have a Britan turret lathe with a two speed 3 phase motor running the spindle and a much smaller 3 phase motor running coolant pump and hydraulic pump, I am running it from a Transwave rotary phase converter and it runs it without any problems. Per my suggestion. As I said, the term Rotary Converter is actually something, such as a Transwave static converter unit, that has a pilot motor to generate a better 3 phase. Especially when a low wattage motor not matched to the unit is run, such as a coolant pump or power feed. When I was a lad, “A Rortary Converter” was a 12v dc motor driving a 200v ac generator to convert low to high voltage. Very heavy on battery drain. |
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