Method for attaching a magnet on or in a rotor or stator

摘要

The invention relates to a method for adhesively bonding a magnet onto the surface or into a slot of a rotor or stator of an electric motor or a generator, wherein i) the surface or surfaces to be glued of the magnet, rotor or stator are pre-coated with an adhesive that is not liquid at 22° C. and that does not cure without an activation step, iii) the magnet is brought into contact with the rotor or stator at the adhesive location, and iv) the adhesive is activated by heating or by high-energy radiation so that it cures, characterized in that the adhesive comprises a) at least one reactive epoxide prepolymer, b) at least one latent hardener for epoxies, and c) one or more elastomers. The adhesive preferably comprises a blowing agent. The invention further relates to a corresponding pre-coated magnet.

主权项

1. A method for adhesively bonding a magnet onto the surface or into a slot of a rotor or stator of an electric motor or of a generator, in which
i) the surface or surfaces of the magnet that is or are to be bonded are pre-coated with an adhesive that is not liquid at 22° C. and that does not cure without an activation step; ii) optionally, the magnet coated with the adhesive is temporarily stored and/or is transported from the coating location to the bonding location, iii) the magnet having the surface coated with the adhesive is placed onto the surface of the rotor or stator and immobilized, or the magnet is inserted into a slot of the rotor or stator in such a way that at least one adhesive-coated surface is located opposite an inner wall of the slot, and iv) the adhesive is activated, by heating or by high-energy radiation, so that it cures, wherein an adhesive containing a) at least one reactive epoxy prepolymer, b) at least one latent hardener for epoxies, and c) one or more elastomers selected from A) block copolymers that contain a first polymer block having a glass transition temperature below 15° C. and a second polymer block having a glass transition temperature above 25° C., B) a block copolymer and a thermoplastic polyurethane or A and B is used.