MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES (ceramics based on ferrites C04B35/26; alloys C22C ; loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers H04R; thermomagnetic devices H10N15/00)

Description

H01F covers the design, manufacture, and materials of passive electromagnetic devices including permanent magnets, electromagnets, inductors, and transformers. This subclass addresses magnetic core materials, winding configurations, shielding techniques, and the selection of materials based on their magnetic properties such as permeability and saturation characteristics. Applications span power distribution, signal processing, energy storage, and electromagnetic conversion across industrial and consumer electronics.

17 direct subcodes

Child Classifications

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H01F 1/00 Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
H01F 10/00 Thin magnetic films, e.g. of one-domain structure (magnetic record carriers G11B5/00; thin-film magnetic stores G11C)
H01F 13/00 Apparatus or processes for magnetising or demagnetising ( ; for degaussing ships B63G9/06; for clocks or watches G04D9/00; ; demagnetising arrangements for colour television H04N9/29)
H01F 17/00 Fixed inductances of the signal type
H01F 19/00 Fixed transformers or mutual inductances of the signal type (H01F36/00 takes precedence)
H01F 21/00 Variable inductances or transformers of the signal type (H01F36/00 takes precedence)
H01F 27/00 Details of transformers or inductances, in general
H01F 29/00 Variable transformers or inductances not covered by group H01F21/00
H01F 3/00 Cores, Yokes, or armatures (magnetic materials H01F1/00; permanent magnets H01F7/02)
H01F 30/00 Fixed transformers not covered by group H01F19/00
H01F 36/00 Transformers with superconductive windings or with windings operating at cryogenic temperature (superconducting magnets or superconducting coils H01F6/00)
H01F 37/00 Fixed inductances not covered by group H01F17/00
H01F 38/00 Adaptations of transformers or inductances for specific applications or functions
H01F 41/00 Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
H01F 5/00 Coils (superconducting coils H01F6/06; fixed inductances of the signal type H01F17/00)
H01F 6/00 Superconducting magnets; Superconducting coils
H01F 7/00 Magnets (superconducting magnets H01F6/00; for separation of solid materials or fluids B03C1/00; for bench or like work-holders B23B31/28, B23Q3/00; work-holding devices B25B11/00; lifting magnets B66C1/00; ; for electric meters G01R; for relays H01H; ; for dynamo-electric machines H02K)