Patent ID: 7837585

Claim:
An electromagnetic actuator assembly comprising: a frame member having an outer sidewall, an inner sidewall and a first end wall that is coupled to the inner and outer sidewalls, the frame member defining an interior annular cavity; a coil assembly mounted in the annular cavity, the coil assembly including a core and a coil; a plunger having an annular intermediate wall and a second end wall that extends radially inwardly from the intermediate wall, the intermediate wall being disposed between the coil assembly and the outer sidewall; an armature that abuts the plunger; first and second sensor targets coupled to the plunger for movement therewith; first and second sensors mounted to the frame, the first sensor being configured to sense a position of the first sensor target and to produce a first sensor signal in response thereto, the second sensor being configured to sense a position of the second sensor target and to produce a second sensor signal in response thereto; and a controller that receives the first and second sensor signals and identifies three or more discrete points along a path of travel of the plunger.