Single phase milling machine recommendations

[SillyOldDufferModerator @sillyoldduffer]

The cost of installing three-phase seems to depend mostly on how close and convenient the source is. My present home gets single phase tapped from three-phase wires on poles outside. 3-phase is close to the house, an easy fit, and I guess it would be fairly cheap.

When I lived in a city suburb, much more difficult. Getting three-phase involved digging a long trench, and trenches are expensive. Seriously expensive if they have to cross or run along a main road.

Single phase can be pricey too, if you can't share the infrastructure with other nearby properties. My mum's hairdresser and husband have been working for about 5 years on a part barn conversion/new build just outside a village. Quote for connecting electricity this year: £14,000.

VFDs are the best solution for most of us.

Dave

[MacolmParticipant @macolm]

Thanks for providing this link –

https://www.model-engineer.co.uk/forums/postings.asp?th=133409

**LINK**

 

The voltages across L and C components must be in antiphase, so greater than applied supply voltage is to be expected. The current is the key measure, and in the link it is clear that while nowhere near resonance, it might well be possible to get pretty near by varying the value of the C. Assuming only the 35 ohms counts, the current in the mesh would be 7 amps at resonance, but in practice the magnetic circuit would contribute additional resistive load/losses.

 

It does confirm, at least to me, that caution is necessary in experimenting with capacitors to convert a three phase motor to single phase. It would very likely be start/run configuration, so has to be ensured to be safe over the whole operating envelope.

Edited By Macolm on 29/06/2022 21:05:54

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