The Saga that is my Conquest mini-lathe re-furb.

[Make Everything]

Steve,
Thanks, been doing a lot of that BUT it seems AC 3 phase is very well covered but DC 3 phase is non-existent except as you say for sub 50 volts.

Although I gather that treadmills run at 80 V but again i can find no new cct for those only cannibalize ones and most of the electronic /technical info is at best "patchy" and not really enough to start a controller from scratch.

I may have to buy a "toy" controller with the biggest ratings available and reverse engineer it with higher voltage/wattage (if those exist ) semi-conductors etc


The motor in question is :-MOTION CONTROL PRODUCTS LTD.
PART NUMBER:- M57BLR95-220-4200AL-1

220V 4200RPM

The company were VERY unhelpful except to tell me the motor was now obsolete and refused to furnish any tech spec/use/ control info except that it is 3 phase (and that was after I said i was puzzled by the fact that it had 3 wires instead of two for the usual DC motor. Which left me a bit puzzled as 3 phase AC usually has 4 wires if my creaking brain is remembering right.



as you see its' body is just about 4" /100mm long

may be as one of our members says that "all of us are smarter than just one of us " and someone here knows some thing about these beasties?


PS STEVE just banged up a copy & paste of your suggested phrase and i found some leads, My Google Fu it seems is not upto par of late Thank You.

Y-Geo，

the motor is a 57mm 3 phase Brushless Motor，If there are only three lines, he is not a Hall element version.the
the M57BLR95-220-4200AL-1 Is the old number，According to the new naming rules, it is 57BS95R-##-2242-T-S,the##is watt
sorry I did not find the data for this model, I think it is custom product for mini lathe，
If his label is correct, you can use the No Hall 310v300-500w Universal Brushless Motor Controller, but there is a high risk. At the same time the cost will increase。your chinese speed controller is a Brush motor controller ，can not be used with this motor！
My advice is to temporarily give up this motor, with a conventional DC motor.
good luck(I am very poor in English, the above content from Google translation, may not be accurate)

[Y-geo]

Make Everything,
That was very helpful Thank You. I assume from what you say that if there were 5 wires it would have hall effect circuit built in.

the british importer did say it was an obsolete motor (which they neglected to mention when i bought it, but at the price i paid not overly fussed ) I will stick with my set up as i have now and continue to research for that motor as i want to use it on a mill or drill.

As for your english I can tell you it is far better that my Mandarin or Cantonese which my first wife tried to teach me. I like your knot tying skills some of which i did manage to learn from her all those years ago.

"No Hall 310v 300-500w Universal Brushless Motor Controller" i did a quick google but came up empty do you have a lead on such an item please?

[Make Everything]

Although I know how it works,But I can not build it, he is more than my knowledge and ability，The motor is the same as the computer's hard drive motor， in Industrial products, usually using arm cpu control。
I think maybe you can buy a 50v BLDC driver, check the windings, try it can work at low voltage, or make low voltage winding for it ,Brushless motor winding is very simple, you can refer to some brushless motor design method, you only need some enameled wire and calculation

[Y-geo]

Make Everything,
thank you, still busy googling to find a suitable circuit or commercial unit for my needs. Luckily i am not in any hurry :-)

it seems that the control IC's are all low voltage but can act as controls for high power MOSFETS that actually power the motor, so i live in hope
thanks for your support