- Patent Title: Haptic actuator including field member multi-dimensional position determined based upon coil back electromotive force and motor constant values and related methods
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Application No.: US15814626Application Date: 2017-11-16
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Publication No.: US10345907B2Publication Date: 2019-07-09
- Inventor: Arman Hajati , Kayo Yanagisawa
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: APPLE INC.
- Current Assignee: APPLE INC.
- Current Assignee Address: US CA Cupertino
- Agency: Allen, Dyer, Doppelt + Gilchrist, P.A.
- Main IPC: H01F7/16
- IPC: H01F7/16 ; H02N2/02 ; H01F41/064 ; G06F3/01
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.
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