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We report a sliding motor in a thin fiber format: a flexible, electrostatic linear actuator with a stroke limited only by fiber length. Comprising two coaxial fibers with helically wound electrodes, this \u201cFiberMotor\u201d generates bidirectional, fast, stepping motion with stroke\u2010independent force and inherent back\u2010drivability, a key feature for safe and transparent human\u2013robot interaction. By eliminating permanent magnets and Joule heating, it offers a compact alternative to traditional motors. Modular bundling allows scaling to higher forces. Supported by an analytical model, this silent, lightweight technology can enable large\u2010scale integration into textiles, providing a promising building block toward future soft exosuits and wearable assistive devices.<\/jats:p>","DOI":"10.1002\/adma.75156","type":"journal-article","created":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T07:18:33Z","timestamp":1790493513000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Fiber\u2010Format Flexible Linear Electrostatic Motors"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2933-7825","authenticated-orcid":false,"given":"Sylvain","family":"Schaller","sequence":"first","affiliation":[{"name":"Soft Transducers Laboratory Ecole Polytechnique F\u00e9d\u00e9rale de Lausanne (EPFL)  Neuch\u00e2tel 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