{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9821839","patent":{"patent_number":"US-9821839","title":"Rotation detection apparatus, rotation angle detection apparatus, and electric power steering system","assignee":null,"inventors":[],"filing_date":"2016-03-29T00:00:00.000Z","publication_date":"2017-11-21T00:00:00.000Z","cpc_codes":["B62D","B62D","B62D","G01D","G01D","G01D"],"num_claims":5,"abstract":"A rotation detection apparatus, a rotation angle detection apparatus are provided which allow appropriate detection of an abnormality in a portion that detects rotation of a rotating shaft. A first arithmetic circuit calculates a rotating direction and a number of rotations of the rotating shaft based on a change in a combination of positivity and negativity of a first electric signal (first sine signal) and a third electric signal (first cosine signal). A second arithmetic circuit calculates a rotating direction and a number of rotations of the rotating shaft based on a change in a combination of positivity and negativity of a second electric signal (second sine signal) and a fourth electric signal (second cosine signal). An abnormality determination circuit determines whether each of the first and second arithmetic circuits and is abnormal based on the two rotating directions and calculated by the first and second arithmetic circuits respectively."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Rotation detection apparatus, rotation angle detection apparatus, and electric power steering system","description":"A rotation detection apparatus, a rotation angle detection apparatus are provided which allow appropriate detection of an abnormality in a portion that detects rotation of a rotating shaft. A first ar","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9821839","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-9821839","citation_suggestion":"Patentable. \"Rotation detection apparatus, rotation angle detection apparatus, and electric power steering system\" (US-9821839). https://patentable.app/patents/US-9821839","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9821839","json":"https://patentable.app/api/llm-context/US-9821839","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T09:31:45.973Z"}