The invention relates to a method and a device for producing laminated cores (2) from laminations (1), in which an adhesive medium is applied as at least one adhesive point (22) to the top of the surface of a sheet metal insulation (21) of a sheet metal strip (5), which is guided horizontally with respect to the direction of gravity, by means of an application unit (35) via an application head (32). Advantages for the structure and function result from the fact that the adhesive medium is transferred as at least one adhesive point (22) to the surface of the sheet metal insulation (21) of the sheet metal strip (5) or a lamination (1) cut from this strip without movable components in the application head (32), the application head (32) being moved perpendicularly relative to the surface of the sheet metal strip (5) in order to transfer the adhesive medium in the form of the at least one adhesive point (22).

The invention relates to a method and a device for producing laminated cores (2) from laminations (1), in which an adhesive medium is applied as at least one adhesive point (22) to the top of the surface of a sheet metal insulation (21) of a sheet metal strip (5), which is guided horizontally with respect to the direction of gravity, by means of an application unit (35) via an application head (32). Advantages for the structure and function result from the fact that the adhesive medium is transferred as at least one adhesive point (22) to the surface of the sheet metal insulation (21) of the sheet metal strip (5) or a lamination (1) cut from this strip without movable components in the application head (32), the application head (32) being moved perpendicularly relative to the surface of the sheet metal strip (5) in order to transfer the adhesive medium in the form of the at least one adhesive point (22).

Systems and methods are provided for a coated lamination layer for an electric motor. The coated lamination layer includes a lamination layer base of annular shape defined by an inner edge and an outer edge with a plurality of radially arranged slot openings and a plurality of radially arranged channel openings, and a sealing layer protruding from a surface of the lamination layer base, wherein the sealing layer is a screen-printed coating. The coated laminations layers are stacked into a stator with the sealing layers sealing regions between the lamination layer bases.

Systems and methods are provided for a coated lamination layer for an electric motor. The coated lamination layer includes a lamination layer base of annular shape defined by an inner edge and an outer edge with a plurality of radially arranged slot openings and a plurality of radially arranged channel openings, and a sealing layer protruding from a surface of the lamination layer base, wherein the sealing layer is a screen-printed coating. The coated laminations layers are stacked into a stator with the sealing layers sealing regions between the lamination layer bases.

A laminated core 10 includes electrical steel sheets 1 and adhesive insulating coatings 2 alternately stacked and has a lamination direction D tensile strength of adhesive bond of 20 MPa or more measured under a 25 C. condition after a complete reaction of each adhesive insulating coating 2. A method for manufacturing a laminated core 10 includes a punching step of punching an electrical steel sheet coated with an adhesive insulating coating 2 to form an electrical steel sheet 1, an accommodating step of stacking and accommodating electrical steel sheets 1 in a die after the punching step, a low-pressure bonding step of heating the electrical steel sheets 1 in the die at a surface temperature of 60 C. or more and 200 C. or less and bonding the adjacent electrical steel sheets 1 by pressurization at 3.0 MPa or less to form a laminated core 10, and a take-out step of taking out the laminated core 10 from the die after the low-pressure bonding step.

A laminated core 10 includes electrical steel sheets 1 and adhesive insulating coatings 2 alternately stacked and has a lamination direction D tensile strength of adhesive bond of 20 MPa or more measured under a 25 C. condition after a complete reaction of each adhesive insulating coating 2. A method for manufacturing a laminated core 10 includes a punching step of punching an electrical steel sheet coated with an adhesive insulating coating 2 to form an electrical steel sheet 1, an accommodating step of stacking and accommodating electrical steel sheets 1 in a die after the punching step, a low-pressure bonding step of heating the electrical steel sheets 1 in the die at a surface temperature of 60 C. or more and 200 C. or less and bonding the adjacent electrical steel sheets 1 by pressurization at 3.0 MPa or less to form a laminated core 10, and a take-out step of taking out the laminated core 10 from the die after the low-pressure bonding step.

A laminated core, more particularly for a stator of an electric machine, and method for producing said laminated core. The laminated core has several layers stacked one atop another, wherein the layers are each made up of either an individual sheet metal part or several sheet metal parts positioned next to one another and each sheet metal part has a protrusion and with the aid of these protrusions, the layers engage with one another. It is proposed, in the case of a single sheet metal part making up a layer, for the protrusion to be embodied as completely surrounding the longitudinal axis of the laminated core or, in the case of several sheet metal parts positioned next to one another making up a layer, for the protrusions of these sheet metal parts to be embodied as combining to completely surround the longitudinal axis of the laminated core.

A laminated core, more particularly for a stator of an electric machine, and method for producing said laminated core. The laminated core has several layers stacked one atop another, wherein the layers are each made up of either an individual sheet metal part or several sheet metal parts positioned next to one another and each sheet metal part has a protrusion and with the aid of these protrusions, the layers engage with one another. It is proposed, in the case of a single sheet metal part making up a layer, for the protrusion to be embodied as completely surrounding the longitudinal axis of the laminated core or, in the case of several sheet metal parts positioned next to one another making up a layer, for the protrusions of these sheet metal parts to be embodied as combining to completely surround the longitudinal axis of the laminated core.

A vacuum cleaner may include a cleaner body, a motor in the cleaner body, the motor including: a rotor, and a stator including a stator core, the stator core including: a plurality of yokes circumferentially around the rotor, a plurality of teeth respectively corresponding to the plurality of yokes, each tooth of the plurality of teeth extending from a respectively corresponding yoke of the plurality of yokes toward the rotor, and a plurality of electrical steel sheets, each electrical steel of the plurality of electrical sheet having yoke shapes respectively corresponding to the plurality of yokes and teeth shapes respectively corresponding to the plurality of teeth, and the plurality of electrical steel sheets stacked with an adhesive layer between each two adjacent electrical steel sheets of the plurality of electrical sheets to form the stator core.

A vacuum cleaner may include a cleaner body, a motor in the cleaner body, the motor including: a rotor, and a stator including a stator core, the stator core including: a plurality of yokes circumferentially around the rotor, a plurality of teeth respectively corresponding to the plurality of yokes, each tooth of the plurality of teeth extending from a respectively corresponding yoke of the plurality of yokes toward the rotor, and a plurality of electrical steel sheets, each electrical steel of the plurality of electrical sheet having yoke shapes respectively corresponding to the plurality of yokes and teeth shapes respectively corresponding to the plurality of teeth, and the plurality of electrical steel sheets stacked with an adhesive layer between each two adjacent electrical steel sheets of the plurality of electrical sheets to form the stator core.