Invention Grant
- Patent Title: Methods to control force in reluctance actuators based on flux related parameters
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Application No.: US17855116Application Date: 2022-06-30
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Publication No.: US11763971B2Publication Date: 2023-09-19
- Inventor: Darya Amin-Shahidi , Hari Vasudevan , Juil Lee , Denis G. Chen
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Brownstein Hyatt Farber Schreck, LLP
- Main IPC: H01F7/18
- IPC: H01F7/18 ; G06F3/01 ; G06F3/041 ; H02P25/08 ; H02P25/092 ; H01H47/04

Abstract:
Disclosed herein are reluctance actuators and methods for feedback control of their applied force. Embodiments of the reluctance actuators include an electromagnet positioned to deflect a metallic plate to provide a haptic output. The control of the force is provided without force sensors (sensorless control) by monitoring voltage and/or current (V/I) applied during an actuation. For a given intended force output, an electrical parameter value (flux, current, or other parameter) is read from a look up table (LUT). The LUT may store a present value of the inductance of the reluctance actuator. The feedback control may be a quasi-static control in which the LUT is updated after actuation based on the monitored V/I. The feedback control may be real-time, with a controller comparing an estimated electrical parameter value based on the measured V/I with the value from the LUT.
Public/Granted literature
- US20220336132A1 Methods to Control Force in Reluctance Actuators Based on Flux Related Parameters Public/Granted day:2022-10-20
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