Plant and method for manufacturing ferromagnetic cores of electric machines

A method for manufacturing ferromagnetic cores of electric machines, wherein each of said ferromagnetic cores is formed by a plurality of laminations packed in a blanking/punching tool to which a continuous metal laminate of ferromagnetic material is fed, said laminations being joined together by gluing, said blanking/punching tool comprising at least one blanking/punching station and at least one cutting station adapted to cut and pack the laminations blanked from said continuous metal laminate, the method comprising the steps of:

• a) advancing said continuous metal laminate of ferromagnetic material through a plant for manufacturing ferromagnetic cores of electric machines;
• b) applying an adhesive material to a surface of said continuous metal laminate through at least one adhesive material application unit, said applying controlled by at least one controller of the plant for manufacturing ferromagnetic cores of electric machines;
• and
• c) after said step b), applying an activating compound, in a depressurized condition, to the opposite surface of said continuous metal laminate using at least one activation unit controlled by said controller;
• wherein, in said step b), said adhesive material is deposited by a printer on at least one transfer device according to one or more impressions of a shape corresponding to an outline of each of said laminations, said adhesive material being then applied by said at least one transfer device to said surface of said continuous metal laminate according to the outline of each lamination, defined by said impressions, and
• said at least one transfer device comprises one or more pads, each receiving said adhesive material deposited thereon, and
• further comprising a presser pressing said pads upon which said adhesive has been deposited, on said continuous metal laminate.

A method for manufacturing ferromagnetic cores of electric machines, wherein each of said ferromagnetic cores is formed by a plurality of laminations packed in a blanking/punching tool to which a continuous metal laminate of ferromagnetic material is fed, said laminations being joined together by gluing, said blanking/punching tool comprising at least one blanking/punching station, the method comprising the steps of:

• a) advancing said continuous metal laminate of ferromagnetic material through a plant for manufacturing ferromagnetic cores of electric machines;
• b) applying an adhesive material to a surface of said continuous metal laminate through at least one adhesive material applicator controlled by at least one controller;
• and
• c) after said step b), applying an activating compound to the opposite surface of said continuous metal laminate through at least one applicator further controlled by said controller and before said continuous metal laminate is fed to said blanking/punching tool,
• wherein, in said step b), said adhesive material is deposited by a printer on at least one transfer device according to one or more impressions of a shape corresponding to an outline of each of said laminations, said adhesive material being then applied by said at least one transfer device to said surface of said continuous metal laminate according to the outline of each lamination, defined by said impressions,
• wherein said controller controls the application of said adhesive material and said activating compound into the adhesive material applicator and the applicator;
• and
• wherein said applying said activating compound to the opposite surface of said continuous metal laminate comprises providing said activating compound in a depressurized condition in a depressurized chamber.

A plant for manufacturing ferromagnetic cores of electric machines, wherein each of said ferromagnetic cores is formed by a plurality of laminations packed in a blanking/punching tool,

• the plant comprising:
• an adhesive applicator adapted to apply an adhesive material to a surface of a continuous metal laminate of ferromagnetic material;
• an activation unit in which an activator is adapted to apply an activating compound to the opposite surface of said continuous metal laminate after said adhesive applicator applies said adhesive material and before said continuous metal laminate is fed to said blanking/punching tool, said at least one activation unit disposed in a depressurized chamber;
• and
• at least one controller adapted to control the application of said adhesive material and said activating compound into the adhesive applicator and the activation unit,
• wherein said blanking/punching tool is adapted to have said continuous metal laminate fed thereto after said adhesive material has been applied to said surface of said continuous metal laminate, and
• wherein said adhesive applicator comprises a printer and at least one transfer device on which said printer deposits the adhesive material according to one or more impressions of a shape corresponding to an outline of each of said laminations, said transfer device comprising one or more pads disposed on a closed belt that moves in a direction transverse to a direction of travel of the continuous metal laminate,
• said adhesive material being then applied by said at least one transfer device to said surface of said continuous metal laminate according to an outline of each lamination, defined by said impressions.