I am interested in having a small device generate low frequency vibrations in the range of 1Hz - 10Hz which can be adjustable. Doing my research, I came across small coin shaped motors which are ideal in size, but have a high RPM 12000-15000 which would translate to a high frequency. Are there any devices that can generate low frequency vibrations? I am open to motors or other hardware that can easily be purchased.
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\$\begingroup\$ "This is not a shopping site" - but there are cell phone vibration micro-motors that you can buy off-the-shelf. \$\endgroup\$– ReinderienCommented Nov 23, 2020 at 2:04
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1\$\begingroup\$ A loudspeaker driven by a suitable source could generate low level vibrations at those frequencies. The bigger the loudspeaker the better of course. \$\endgroup\$– BarryCommented Nov 23, 2020 at 2:30
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\$\begingroup\$ @Barry I’m assuming that the speaker can do this without sound? \$\endgroup\$– GK89Commented Nov 23, 2020 at 2:31
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\$\begingroup\$ You won't get much power from a speaker at infrasound frequencies \$\endgroup\$– Chris StrattonCommented Nov 23, 2020 at 2:39
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\$\begingroup\$ think of the motion of your knee when you ride a bicycle \$\endgroup\$– jsotolaCommented Nov 23, 2020 at 3:36
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1 Answer
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What you're looking for is called an audio exciter or a 'bass shaker'.
It's basically the magnet and voice coil of a loudspeaker without the cone and frame. In their intended use of turning walls, doors, ceiling tiles etc into loudspeakers, you connect the armature to a panel, and the mass of the stator is usually sufficient, at audio frequencies, to get reasonable efficiency when shaking the panel.
But they also work right down to 10 Hz, 1 Hz, DC even. The problem at these frequencies is providing a heavy enough stator. The vibration power will divide between the stator and armature in the ratio of their effective masses. If the stator is too light, you'll be shaking the stator more than the load. Choose a type where you can add mass to the body of the exciter, or be able to mount it on something massive.
