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| Get speed from peristaltic pump, add magnet and hall effect? |
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| 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. |
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