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| how to check a motor |
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| Arbalist:
It's worth pointing out that I bought a milling machine some years ago with a (single speed) three phase motor and I happily ran it on 240V Single Phase for several years. There were instructions on the net from a Capacitor Manufacturer on how to do this and it was a really cheap "fix" requiring only swapping of connections inside the motors terminal box and buying a large capacitor to go between the live and neutral. The instructions stated that you only get 80% of the motors rated power output but that was never an issue for me. I understand this does not work with all three phase motors but luckily for me it worked on my machine. I really wish I had made a video of the mill running before I sold it as there have been many folks who said it can't be done! As an aside, I read recently that it is not uncommon practice for equipment suppliers to fit three phase motors on machines intended for a single phase supply by making some alterations to the motors wiring. Using up old stock or availability of cheap motors were reasons quoted for this. |
| John Stevenson:
Not hard to run a single speed 3 phase motor off single, especially if it's a low power application. Coolant pump on a machine is a classic example. You rewire the main motor from star to delta and fit an inverter and this puts that motor on single phase but you are left with the coolant pump. So also change this one from start to delta and put single phase across two of the terminals, then add a capacitor to live and the unconnected terminal and it will work. A cap out of a florescent light is ideal for a small motor |
| JohnHaine:
Um, John, I think fluorescent lights have ballast inductors in them, not capacitors? |
| lordedmond:
Yes they do to correct the lag in cos thi introduced by the inductor Basically they are for power factor correction Inductors lag cap lead thus unity is achieved Stuart |
| DavidA:
...Um, John, I think fluorescent lights have ballast inductors in them, not capacitors?... All the florescent lights in my shed have both. Dave. |
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