Patent ID: 8917486
Filing Date: 2014-12-23
Classification: B06B,H02K,H02P

Abstract:
1. A vibration generating apparatus including a damping system having a damping ratio ζ<1 to support a mechanical vibrator with respect to a fastening part through a spring element, and a magnetizing means generating a dynamic magnetic field to vibrate said mechanical vibrator without contact, said mechanical vibrator generating a beat vibration by making the frequency of a drive voltage applied to said magnetizing means, from a drive start or middle of drive, to be a non-resonant frequency out of a damped natural frequency of said mechanical vibrator, wherein: said vibration generating apparatus comprises a forced vibration control means controlling to stop application of said drive voltage, in a beat wave defining an amplitude of said beat vibration, at a second valley part after a first peak part from the side of said drive start; wherein a frequency of said drive voltage is substantially 3 times said damped natural frequency and where said drive voltage which is applied to said magnetizing means is an independent wave comprised of a first sine half wave, a second sine half wave of an opposite phase to said first sine half wave, and a third sine half wave of an opposite phase to said second sine half wave.