which 3 or single phase motor for ML7

I was thinking that I may change my motor from a single to 3 phase so that I can

fit a speed control, not an electrian so will have to buy some kind of unit to do this, My first thought is will I feel the benafit of a speed controller and if so which one, any kake better the another or should I spend my money els were.

Ron,

You don't say which machine you are talking about, or what the motor power is - always give as much info as you can to allow responders to give you the best answer. Also, best to state where you live as if you are outside the UK the suppliers, and the electrical supply position, may differ.

As you suggest you have no great expertise here, it would probably be best to get a motor/VFD package from one of the regular suppliers of these things. I fitted one from Newton Tesla to my Myford S7, and also an inverter from them to my M300 (it already had a 3-phase motor). The S7 package in particular was very much plug-and-play, all the electrical connections were wired up with safe plugs and sockets; the M300 required a bit of wire connecting by me as it was non-standard. I have been completely satisfied with both and have no hesitation in recommending that firm, but there are other suppliers, see magazines. If you tell them what machine you have they will know what motor mount and size will be right for you.

David

Edited By David Littlewood on 26/11/2012 20:00:42

Ron,

I converted my ML7 to a three phase motor running off domestic supply via an ABB invertor about a year ago and have been very pleased with the results. Smoother running, ramped start and reverse, variable speed, and with a pulley change, top revs of 840.

If you are buying a three phase motor second hand, ensure that it is dual voltage, i.e. the motor plate mentions 220-240 and 420-440 volts. No wide experience of different makes of phase invertors, but I've had no problems with mine.

Nigel

David, please read your PMs

Ron,

I fitted a Transwave unit to my ML7 about January/February time. Very easy to do. Just remember there aare two grub screws holding the motor plate pivot in position! Any firm worth your money will advise on which motor/controler to use. The pendant control enables you to have the control next to you. Using the overspeed function on the Variable frequency unit enables me to have a top spindle speed over 2000rpm. a bit scary at that so I have left the output maximum at 50Hz..

Best of luck

John

Ron

This is what I posted to a similar query in Sept.

"Perhaps not technically helpful, but I have an ML7 (Trileva) and recently replaced the knackered single phase with a new 3 phase. Control provided by a secondhand Omron V7 inverter/controller. This was all connected, ready to go and just left me to (cautiously!!) rewire from delta to star (?) and plug it in. Result? ... superb! Soft start, easy speed control in any of the three belt selections (plus 3 backgear, if needed) - almost makes the clutch redundant. Highly recommended.

Rgds

Bill"