公开(公告)号：US20190073034A1

公开(公告)日：2019-03-07

申请号：US15814626

申请日：2017-11-16

Applicant: Apple Inc.

Inventor： Arman HAJATI ,  Kayo YANAGISAWA

IPC: G06F3/01 ,  H01F41/064 ,  H01F7/16 ,  H02N2/02

CPC classification number: G06F3/016 ,  G06F1/163 ,  H01F7/0289 ,  H01F7/066 ,  H01F7/1638 ,  H01F7/1646 ,  H01F7/1653 ,  H01F41/064 ,  H02N2/028

Abstract: A haptic actuator may include a housing, coils carried within the housing, and a field member moveable within the housing between the coils and including at least one permanent magnet. A controller may be coupled to the coils and configured to sense a respective back electromotive force (EMF) value of each of the coils and determine a position of the field member in dimensions based upon the back EMF values and motor constant values.