# US 2013/0278103 A1 · Stator used in an electrical motor or generator with low loss magnetic material and method of manufacturing a stator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0278103 A1 - Document ID: US20130278103A1 - Status: Published application - Kind: A1 - Application number: 13/993,167 - Filed: 2011-12-13 - Published: 2013-10-24 - Earliest claimed: 2010-12-13 - Assignees: RADAM Motors, LLC - Inventors: Mark W. McPherson; Andrew D. Hirzel - Web page: https://patentgrep.com/patent/US20130278103A1 ## CPC - H02K 1/17: Stator cores with permanent magnets - H02K 1/148: {Sectional cores (H02K1/141 takes precedence)} - H02K 15/02: of stator or rotor bodies - Y10T 29/49009: Dynamoelectric machine - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A stator for an electrical motor or generator and method for manufacturing such stator includes providing a plurality of teeth and joining the teeth with a yoke. An electrically conductive winding is applied around each of the teeth. The teeth and/or yoke may be made from a stack of low-loss magnetic material sheets. The teeth and/or yoke may be made by folding a stack of magnetic material sheets. ## Claims ### Claim 1 (canceled) ### Claim 2 (depends on 9) The stator as claimed in claim 9 wherein at least one chosen from said teeth and said yoke comprises at least one folded stack of low-loss magnetic material sheets. ### Claim 3 (canceled) ### Claim 4 (depends on 2) The stator as claimed in claim 2 wherein each of said teeth is made from a plurality of said folded stacks of low-loss magnetic material sheets. ### Claim 5 (depends on 2) The stator as claimed in claim 2 wherein said yoke comprises a plurality of yoke pieces, each comprising at least one stack of low-loss magnetic material sheets. ### Claim 6 (depends on 5) The stator as claimed in claim 5 wherein each of said yoke pieces span adjacent ones of said teeth. ### Claim 7 (depends on 5) The stator as claimed in claim 5 wherein said magnetic material sheets of said yoke pieces are non-coplanar with said magnetic material sheets of said teeth. ### Claim 8 (depends on 5) The stator as claimed in claim 5 wherein said teeth and said yoke pieces are retained together by complementary shapes formed in said teeth and said yoke pieces. ### Claim 9 (depends on 29) The stator as claimed in claim 29 wherein said magnetic material sheets comprise a silicon content of at least approximately 6.0%. ### Claim 10 (depends on 29) The stator as claimed in claim 29 wherein said magnetic material sheets comprise at least one chosen from an amorphous metal, a nanocrystalline metal and an optimized Si—Fe alloy. ### Claim 11 (depends on 29) The stator as claimed in claim 29 wherein said magnetic material sheets have a thickness that is less than or equal to approximately 100 micrometers. ### Claim 12 (depends on 11) The stator as claimed in claim 11 wherein said magnetic material sheets have a thickness in a range of approximately 20 to approximately 50 micrometers. ### Claim 13 (depends on 29) The stator as claimed in claim 29 wherein said magnetic material sheets are non-insulated from each other. ### Claim 14 (depends on 29) The stator as claimed in claim 29 wherein said magnetic material sheets are held together without substantial adhesive. ### Claim 15 (canceled) ### Claim 16 (canceled) ### Claim 17 (depends on 29) The stator as claimed in claim 29 wherein said folded stack of low-loss magnetic material sheets defines a bight in said magnetic material sheets. ### Claim 18 (depends on 17) The stator as claimed in claim 17 including at least one chosen from a retention device at said bight and a retention shape formed at said bight. ### Claim 19 (depends on 17) The stator as claimed in claim 17 including an air gap pole face formed in each of said teeth opposite said bight and a wire winding notch between said pole face and said bight, wherein said pole face extends laterally outwardly from said wire winding notch. ### Claim 20 (depends on 29) The stator as claimed in claim 29 wherein said yoke is made from a soft magnetic material that is different from the material comprising said low-loss magnetic material sheets. ### Claim 21 (depends on 20) The stator as claimed in claim 20 wherein said yoke is an injection-molded yoke that is either molded to said teeth or formed from injection-molded yoke pieces that are attached to said teeth. ### Claim 22 (depends on 29) The stator as claimed in claim 29 wherein said yoke is joined to said teeth after said winding is formed around each of said teeth. ### Claim 23 (depends on 29) The stator as claimed in claim 29 including a bobbin around each of said teeth and a wire coil wound around said bobbin. ### Claim 24 (depends on 23) The stator as claimed in claim 23 wherein said bobbin defines an internal space for receiving one of said teeth and for joining that tooth to adjacent yoke pieces. ### Claim 25 (depends on 23) The stator as claimed in claim 23 wherein each said bobbin includes complementary shapes for joining to adjacent ones of said bobbin. ### Claim 26 (depends on 23) The stator as claimed in claim 23 wherein said bobbin is defined by bobbin halves and insulating paper joining said bobbin halves. ### Claim 27 (depends on 26) The stator as claimed in claim 26 wherein said bobbin halves are identical in shape. ### Claim 28 (depends on 29) The stator as claimed in claim 29 in combination with a rotor thereby defining an electrical motor or an electrical generator. ### Claim 29 A stator for an electrical motor or generator, said stator comprising: a plurality of teeth; a yoke joining said teeth; and an electrically conductive winding around each of said teeth; wherein at least one chosen from said teeth and said yoke comprises at least one folded stack of magnetic material sheets, wherein the folded stack of magnetic material sheets is flattened thereby providing mechanical bonding between the sheets tending to hold the sheets together. ### Claim at position 30 30-61. (canceled) ### Claim 62 A method of making a stator for an electrical motor or generator, said method comprising: forming a plurality of teeth; forming a yoke and joining said teeth to said yoke; and juxtaposing an electrically conductive winding around each of said teeth; including forming at least one chosen from said teeth and said yoke by folding at least one stack of magnetic material sheets to form a folded stack of magnetic material sheets and including flattening the folded stack of magnetic material sheets thereby providing mechanical bonding between the sheets tending to hold the sheets together.