Abstract

Calibrating the force factor (BL) of linear resonant actuators (LRAs) in some production environments may present challenges, as certain laboratory instruments can be slow or costly for high-throughput quality control. A method is described to calculate BL by extracting key parameters from an LRA's electrical impedance curve. This approach can identify points such as resonant frequency, maximum impedance, and direct current resistance to determine the motional impedance (ΔZ) and mechanical Q factor (Qms), which can avoid some complex curve-fitting procedures. These values, along with a known moving mass (m), can then be used in a formula, for example BL = (ω₀ ⋅ m ⋅ ΔZ / Qms)¹/², to compute the force factor. This computationally efficient approach may provide a means for determining BL, making it potentially suitable for integration into manufacturing lines for per-unit calibration to help improve the consistency of haptic feedback across various devices.

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.

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