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Need vibration 24/7 for a few weeks without breaking

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mortrek:
I'm trying to do an experiment that requires a vibration motor / some way to vibrate a container at a fairly high frequency, but I need it to run for weeks or more, preferably 24/7 but possibly on a timer. I'm also trying to do it as cheaply as possible.

I tried some cheapo Chinese coin cell vibration motors running 24/7 and they lasted 2-3 days and then broke. The container that I'm vibrating can be fairly small, and the frequency is not extremely important, but a bit lower is better. The motors I had are something like 10k RPM, but a few thousand RPM would be good if possible. I just need them to be reasonably powerful, but that being said, the cheap coin cell ~40mA motors were probably strong enough.

I've considered the more expensive brushless name-brand motors, like Jinlong W0934AB001G, but those still are only rated to maybe last a week or two of continuous use (I'm extrapolating the ratings, since they are based on pulsing on and off). I could time the vibration, running it for a few seconds, then off for like 30, something like that, but I was hoping to use some easy thing I could just drop in and it would work. I have a feeling that I'd need to break out an MCU or 555  with a transistor to get the needed current, or something like that, to make that happen.

I've also considered using a speaker to vibrate it from the bottom, but I'm not sure how to best approach that option. A super cheap frequency gen + cheap amplifier + cheap speaker might work.

Everything I can come up with is a bit of a cludge but I'm not sure if there is any obvious and simple and cheap solution that I'm missing.

Thank you ahead of time for any guidance or tips.

cur8xgo:

--- Quote from: mortrek on June 23, 2019, 06:40:31 pm ---I'm trying to do an experiment that requires a vibration motor / some way to vibrate a container at a fairly high frequency, but I need it to run for weeks or more, preferably 24/7 but possibly on a timer. I'm also trying to do it as cheaply as possible.

I tried some cheapo Chinese coin cell vibration motors running 24/7 and they lasted 2-3 days and then broke. The container that I'm vibrating can be fairly small, and the frequency is not extremely important, but a bit lower is better. The motors I had are something like 10k RPM, but a few thousand RPM would be good if possible. I just need them to be reasonably powerful, but that being said, the cheap coin cell ~40mA motors were probably strong enough.

I've considered the more expensive brushless name-brand motors, like Jinlong W0934AB001G, but those still are only rated to maybe last a week or two of continuous use (I'm extrapolating the ratings, since they are based on pulsing on and off). I could time the vibration, running it for a few seconds, then off for like 30, something like that, but I was hoping to use some easy thing I could just drop in and it would work. I have a feeling that I'd need to break out an MCU or 555  with a transistor to get the needed current, or something like that, to make that happen.

I've also considered using a speaker to vibrate it from the bottom, but I'm not sure how to best approach that option. A super cheap frequency gen + cheap amplifier + cheap speaker might work.

Everything I can come up with is a bit of a cludge but I'm not sure if there is any obvious and simple and cheap solution that I'm missing.

Thank you ahead of time for any guidance or tips.

--- End quote ---

Take a motor, put an offset weight on the shaft, and attach the motor to a plate which is attached to your container. Speed of motor = frequency of vibrations, mass of weight and distance of weight from shaft set amplitude of vibrations.

mortrek:
Will that work long-term though? A normal motor isn't meant to have that kind of force on its shaft right? I'd worry that it'd break, and I'm not sure what sort of weight to use that wouldn't eventually break off or something. I can get a standard larger vibration motor I suppose.

Kleinstein:
Not large is relative. It really depends on the weight of the box to shake an how much vibration is needed.
A reasonably large an robust motor with a little unbalance it one option. If not too much unbalance it can run for quite some time (e.g.. months).

If it's powerful enough the speaker and amplifier way can work too. It may help if the frequency is at a resonance as much lower power is needed in this case.

joeqsmith:
Without knowing details on the weight, frequency and displacement, it's hard to say.   I was attempting to run some simple vibration tests at home.   Maybe this will give you some ideas.

https://www.eevblog.com/forum/testgear/hear-kitty-kitty-kitty-nope-not-that-kind-of-cat/msg2292114/#msg2292114

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