Numerical Investigation on Suppressing High Frequency Self-Excited Noises of Armature Assembly in a Torque Motor Using Ferrofluid

Table 1

and introduced by ferrofluid at each resonant frequency.

Resonant frequency (Hz)	Resonant peak (μm)	Squeezing velocity (m/s)	(N/m)	(Ns/m)
470	40.473	0.0761	86.72	0.5371
1140	62.694	0.2859	339.51	0.5317
2580	3.314	0.0342	36.47	0.5447
3585	1.42	0.0204	21.95	0.5531