Electronics > Projects, Designs, and Technical Stuff
Get speed from peristaltic pump, add magnet and hall effect?
rhodges:
--- Quote from: DaJMasta on August 20, 2019, 10:07:22 pm ---Do you think swapping in a stepper for the standard motor could be an option?
--- End quote ---
No. The motor shaft is matched to the rollers so that the friction is "just right".
I know parts will wear out and fail, so I will have spares at all times. These pumps are less than $4 each.
I appreciate your point about the flow being a function of pump speed. That is why I think this type is the best for my application. I want slow, steady, and safe failure.
Thanks!
cv007:
>With a peristaltic pump it all probably looks the same whether liquid/no liquid, so that would probably be of no use
>I want to detect stalling
Well, then maybe measuring back emf between pulses would work for that. Stalled = no movement = no back emf = seeing supply voltage through motor. Not stalled = some back emf = less than supply voltage seen depending on rpm. Although you can't really measure the liquid load as it will look similar enough whether pumping liquid or an empty tube, I would think you can at least determine if the motor is moving at all. There probably is no middle ground- its moving or its stalled.
David Hess:
Back EMF and current sensing can be made to work but a hall effect sensor or an optical interrupter will be simpler. Multiple magnets or blades will allow multiple pulses per revolution if desirable.
Navigation
[0] Message Index
[*] Previous page
Go to full version