2007-10-24 05:05:46 · 6 answers · asked by mangal 4 in Science & Mathematics ➔ Engineering
I had seen them in use for massaging chair and it looked more like some sort of pads.
2007-10-25 01:06:57 · update #1
probably an asymetric cam (wonky motor for less technical people)
2007-10-24 05:08:34 · answer #1 · answered by D24 3 · 0⤊ 1⤋
The cheaper ones have a motor with a weight on its shaft. The weight is placed off center so it shakes the motor as it spins and that is the vibration source.
Anything with piezoelectric elements in it would shake so fast (14000 per second) that you would not get much of a massage from it. Besides it is more expensive than a cheap motor with an off-center weight and cost does count on consumer products.
2007-10-24 12:17:21 · answer #2 · answered by Rich Z 7 · 0⤊ 0⤋
I don't know about massagers but in cell phones, there is a tiny motor with a small weight mounted to the shaft, just a touch off center... causes vibration.
2007-10-24 12:47:21 · answer #3 · answered by Anonymous · 0⤊ 0⤋
The vibrating element is a simple off-axis cam on a motor shaft.
2007-10-24 14:18:02 · answer #4 · answered by Warren W- a Mormon engineer 6 · 0⤊ 0⤋
Could also be piezoelectrics.
2007-10-24 12:09:40 · answer #5 · answered by Doctor Q 6 · 0⤊ 0⤋
ask your mother or sister.
2007-10-26 12:23:17 · answer #6 · answered by Anonymous · 0⤊ 0⤋