Hi Folks, this is a preliminary, looking for anyone who has come across a similar issue before, before I start trying to reverse engineer the PCB etc. (Which I'm not a big fan of as it would really need live testing.)
I have a 230V AC 50Hz (single phase) Optimum Lathe, which has a variable speed control - their own inverter I guess.
After a few years of light use the motor is now running erratically - see the video (only the motor is running, with the gears disconnected):
- It stutters and splutters as it suddenly accelerates, then decelerates .. while it is supposed to maintain constant speed. The problem has actually developed over time, as it would occasionally have very "fits" of this behavior before, but now it is constant. The actual running speed is supposed to be preset by a pot. on the control panel of the machine.
It sort of suggests some sort of mechanical (?) feedback issue, as I would have thought that a purely electronic fault would not be quite so intermittent and would not tend to get worse over time. There is a hall effect sensor on the back of the motor, but is this really likely to cause a fault? Plus To really test this I need to have the lathe running and all the wires to buttons, interlocks etc. are all a bit short, so live testing would be rather precarious, and if there is a quick obvious fault I would prefer to try fix this first.
(The motor is (probably) a 3 phase one, so its unlikely to have brushes).
I am in contact with the technical support at optimum, but so far they have not really been able to assist.
(The PCB photo is just a preliminary one while I see if anyone has had any similar experience, before I get deeper into it!)
I have a 230V AC 50Hz (single phase) Optimum Lathe, which has a variable speed control - their own inverter I guess.
After a few years of light use the motor is now running erratically - see the video (only the motor is running, with the gears disconnected):
It sort of suggests some sort of mechanical (?) feedback issue, as I would have thought that a purely electronic fault would not be quite so intermittent and would not tend to get worse over time. There is a hall effect sensor on the back of the motor, but is this really likely to cause a fault? Plus To really test this I need to have the lathe running and all the wires to buttons, interlocks etc. are all a bit short, so live testing would be rather precarious, and if there is a quick obvious fault I would prefer to try fix this first.
(The motor is (probably) a 3 phase one, so its unlikely to have brushes).
I am in contact with the technical support at optimum, but so far they have not really been able to assist.
(The PCB photo is just a preliminary one while I see if anyone has had any similar experience, before I get deeper into it!)
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