“…The PM-biased MA is mainly applied to a radial bearing for high speed rotors (Murphy et al, 2004;Meeks et al, 1994), and is occasionally combined with an axial bearing (McMullen et al, 2000). It is often used as an actuator for precision positioning (Molenaar et al, 1997;Lee et al, 2002;Kim and Gweon, 2005), and as a vibration isolator (Lee and Lee, 2006) or electro-magnetic exciter (Lequesne, 1990;Oberbeck and Ulbrich, 2002).…”