(Another) Mini Lathe Speed Controller Problem

Thanks for taking pictures and posting the manual, its contents are better than I expected.

Earlier today I ordered a HuSuper 550W from Amazon (less than £100) and will post my experience here when I get it.

Ian P

Thank You.It is same leaflet as for both my 600W and 1500 W version.

I have really tried to change ramp up and down speed and have not been succesfull.

When some reader here succeds please make a Youtube.

I seem to remember that programing a HuanYang was difficult as well

The order of adjustments was not unimportant.

Maybe same procedure here.

Do not fool around index P4 step and we will not destroy anything.

Edited By Niels Abildgaard on 08/03/2022 20:12:00

Good evening Niels,

Are you wanting to control the motor from an external source, such as a computer or CNC set-up?

If so you may be able to use the 0-5 volt signal supplied to the Hall Effect Sensor in the foot control. The Sensor must modify this voltage in some way and feed it back to the controller to allow it to alter the motor speed.

I do not have anywhere near enough knowledge to suggest how this could be done but this forum is full of people who will be able to suggest a solution.

regards,

David

Edited By Clock polisher on 09/03/2022 19:46:13

Edited By Clock polisher on 09/03/2022 19:46:33

I have now had a first look at the 'Husuper 550w sewing machine servo motor' (£91) that came this morning via Amazon. Nowhere on the box, leaflet or the kit itself does it show the motor rating so I'm not really sure what I have.

First impression is favourable, plugged it together and powered it up and its very quiet. The supplied speed control device might be fine for a sewing machine foot pedal but its entirely unsuitable for use on a lathe or mill as it is. There is no conventional potentiometer but instead uses magnet and Hall effect sensor. I have not investigated the circuitry yet but need to put a warning here in case anyone is thinking of replacing the Hall sensor with a pot.

These sewing machine servo motors operate direct off the mains and have no isolation. In particular the Hall sensor (inherently a low voltage device) and its associated wiring could be at mains potential

Ideally I would like to have stop, start, forward, reverse and speed control on a pendant (as a typical VFD installation) so will look at ways of modifying the control circuitry to add galvanic isolation (and NVR too).

Ian P

Good morning David

I have given my much modified 180 lathe with sewing machine motor to a new home,so I am not directly involved as my present 250 has a HuanYang and a 3 phase squirrel cage motor.

My main problem with my sewing machine motor was that cable between motor and Hall box was very short.

Direction and max speed is ordered from the converter panel very easy and fast and the Hall arm works as the clutch handle on old single phase Myfords.

These motors are used by millions and if fatality was an issue it is solved.I think

Edited By Niels Abildgaard on 12/03/2022 05:39:06

Lots of industrial speed controller aren't mains isolated - for example the KBE one I have. Pots designed to provide isolation between the wiper & track and the shaft/housing, and often the shaft is nylon. Replacing a Hall controller with a pot probably isn't straightforward.

Big big difference between industrial speed controllers and these sewing machine motors!

Its a while since I have used one but a system component like the KBE motor drivers comes complete with a detailed user manual with probably pages of installation information with more than a few carrying safety warnings. KBE driver units are intended to be installed in full accordance with KBE's documentation. I do know that KB sell a piggy back PCB that gives Galvanic isolation to the i/o signals.

Whilst there is s CE logo on this sewing machine motor there is none on the controller itself and I very much doubt it could ever be made to comply.

Ian P

Heureka

Program step 08 has to be set at 0 and motor coasts to stop.

Much nicer than before where it happened instantaneously.

The Hall sensor thing is interesting  and I cannot se how it can be dangerous unless the three lead cable is penetrated by a sharp metal edge.

I plan to maneuvre it with a hand-twist gearchange from a moutain bike with quick release.

When belt is really thigth I cannot stop the spindle 125mm flange doing 50 rpm with leather gloves on

Edited By Niels Abildgaard on 19/06/2022 18:25:39

Edited By Niels Abildgaard on 19/06/2022 18:27:43

Edited By Niels Abildgaard on 19/06/2022 18:30:07

Quite some tests of how to instal and use the sewing machine Hall sensor has been made before I found a solution I am satisfied with.

A high resolution picture here:

Sewing motor control

Only problem is that the link below picture offers something much better and cheaper.

Can anyone please tell me which colour wires go where on the three terminals on this board. thanks. Steve

https://i.ebayimg.com/images/g/YEUAAOSwhyFj-PFN/s-l1600.jpg