Software suggestions and requests

[DoulosDS]

I suspect the most likely problem will be how to attach a magnet to the motor shaft. The photos don't give me much hope at the commutator end of the motor, unless the magnet were very small and could be glued to the end of the shaft with a droplet of epoxy. I'll have to open it up to see if the gear train provides a better magnet mounting opportunity. Maybe the gear on the output shaft will have a suitable spot. It will be a few weeks before the pump arrives here from China, so I won't know until early May.

[CescoAiel]

I suspect the most likely problem will be how to attach a magnet to the motor shaft. The photos don't give me much hope at the armature end of the motor, unless the magnet were very small and could be glued to the end of the shaft with a droplet of epoxy. I'll have to open it up to see if the gear train provides a better magnet mounting opportunity. Maybe the gear on the output shaft will have a suitable spot. It will be a few weeks before the pump arrives here from China, so I won't know until early May.

Depending on the stator/rotor confuguration (and whether it is brushless or not) you may even be able to sense the rotor rotation from the outside, without attaching any magnets... Something you could test before even attempting to open it and attach a magnet anywhere...

[DoulosDS]

Depending on the stator/rotor confuguration (and whether it is brushless or not) you may even be able to sense the rotor rotation from the outside, without attaching any magnets... Something you could test before even attempting to open it and attach a magnet anywhere...

From the photos, I'm pretty sure it has brushes and permanent stator magnets. I have no idea whether the rotor magnetic fields can be detected outside the motor, but I doubt it, with the steel casing and stator magnets shielding them. Maybe a hall effect sensor could be located inside the motor as close to the rotor as is practical; that might be able to count the passing rotor lobes, however many there are. That might be easier than dealing with the noise in the power circuit.

[CescoAiel]

From the photos, I'm pretty sure it has brushes and permanent stator magnets. I have no idea whether the rotor magnetic fields can be detected outside the motor, but I doubt it, with the steel casing and stator magnets shielding them. Maybe a hall effect sensor could be located inside the motor as close to the rotor as is practical; that might be able to count the passing rotor lobes, however many there are. That might be easier than dealing with the noise in the power circuit.

Agreed, but it's worth a try to save on time dealing with dis- and re-assembly...

Since you're experimenting with peristaltic pumps, I've let that go. I'm now thinking about cheap ways to make a movable platform with sufficient resolution instead...