# US 2014/0151926 A1 · Method of resin sealing permanent magnets in laminated rotor core > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0151926 A1 - Document ID: US20140151926A1 - Status: Published application - Kind: A1 - Application number: 14/172,270 - Filed: 2014-02-04 - Published: 2014-06-05 - Earliest claimed: 2005-01-24 - Assignees: Mitsui High-Tec, Inc. - Applicants: Mitsui High-Tec, Inc. - Inventors: Satoshi Matsubayashi; Hirotoshi Mabu; Katsumi Amano; Atsushi Shiraishi - Web page: https://patentgrep.com/patent/US20140151926A1 ## CPC - H02K 15/12: Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines - B29C 45/021: {Plunger drives; Pressure equalizing means for a plurality of transfer plungers} - B29C 45/14008: {Inserting articles into the mould (B29C45/14827 takes precedence)} - B29C 45/14065: {Positioning or centering articles in the mould} - B29C 45/14778: {the article consisting of a material with particular properties, e.g. porous, brittle} - H02K 1/274: the rotor consisting of two or more circumferentially positioned magnets - H02K 15/03: having permanent magnets - B29C 2045/14934: {Preventing penetration of injected material between insert and adjacent mould wall} - B29K 2105/203: {Magnetic parts} - H02K 1/276: Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS ## Abstract A laminated rotor core (36) wherein permanent magnets (47) are inserted in respective magnet insertion holes (46) is disposed between and pressed by an upper die (37) and a lower die (29). The upper die (37) has resin reservoir pots (50) provided above the laminated rotor core (36) and at positions corresponding to the respective magnet insertion holes (46). Raw resin material put in the resin reservoir pots (50) is heated by the upper die (37). Subsequently, the resin material in a liquefied state is ejected from the resin reservoir pots (50) by plungers (52) that are inserted and moves vertically in the resin reservoir pots (50) and is directly filled in the magnet insertion holes (46). Consequently, the respective magnet insertion holes (46) are filled with the resin material more evenly and highly reliable products can be supplied at low cost. ## Claims ### Claim 1 A method of resin sealing permanent magnets fixing permanent magnets inserted in a plurality of magnet insertion holes formed in a laminated rotor core, the laminated rotor core formed by laminating a plurality of core pieces, comprising: a step of setting the laminated rotor core on the carrier tray; a step of disposing the laminated rotor core placed on the carrier tray between an upper die and a lower die; and a step of resin sealing the permanent magnets in the magnet insertion holes in a state that the laminated rotor core is pressed between the upper die and the lower die. ### Claim 2 (depends on 1) The method of resin sealing permanent magnets as defined in claim 1, wherein the resin sealing of the permanent magnet into the magnet insertion holes is performed using plungers, each plunger vertically moves in the resin reservoir pots, by forcing resin material out of resin reservoir pots, the resin reservoir pots vertically penetrating the upper die. ### Claim 3 (depends on 2) The method of resin sealing permanent magnets as defined in claim 2, wherein a bushing is provided in the resin reservoir pots to reduce friction with the plunger. ### Claim 4 (depends on 1) The method of resin sealing permanent magnets as defined in claim 1, wherein a shaft hole is provided in the laminated rotor core, and the laminated rotor core is set on the carrier tray by inserting a guide member of the carrier tray into the shaft hole. ### Claim 5 (depends on 2) The method of resin sealing permanent magnets as defined in claim 2, wherein a distal end of the guide member is projecting from an upper end of the laminated rotor core. ### Claim 6 A method of resin sealing permanent magnets fixing the permanent magnets by injecting resin material into magnet insertion holes, the permanent magnets being inserted in a plurality of the magnet insertion holes formed in a laminated rotor core, the laminated rotor core being formed by laminating a plurality of core pieces, comprising: injecting the resin material in a state that the laminated rotor core is pressed between an upper die and a lower die. ### Claim 7 An apparatus for resin sealing permanent magnets, wherein the permanent magnets inserted in a plurality of magnet insertion holes formed in a laminated rotor core are fixed by injecting resin material into the magnet insertion holes, the laminated rotor core being formed by laminating a plurality of core pieces, comprising: a lower die provided with a first heating means to heat the laminated rotor core from below, the first heating means also being vertically movable, while the laminated rotor core being placed on the lower die; an upper die provided with a second heating means to heat the laminated rotor core from above and also provided with a plurality of resin reservoir pots in which the raw resin material is injected, while the upper die being placed on the laminated rotor core; a middle stationary plate fixed and disposed upward on the upper die; and a plurality of plungers pressurizing the respective resin material injected into the elevated resin reservoir pots of the upper die through the middle stationary plate. ### Claim 8 (depends on 7) The apparatus for resin sealing permanent magnets as defined in claim 7, wherein a plunger holder is provided on an upper portion of the plurality of respective plungers vertically attached, and the plunger holder has a structure allowing vertical movement by lifting means. ### Claim 9 (depends on 7) The apparatus for resin sealing permanent magnets as defined in claim 7, wherein a space for injecting the raw resin material in the resin reservoir pots can be formed between the middle stationary plate and the upper die.