Method to improve adhesion of rotor magnets being embedded in an interior permanent magnet motor

A method to improve adhesion of a permanent magnet (01) while being embedded within a cavity (02) in a rotor (03) of an interior permanent magnet motor, the method comprising—

• a) Applying a metered quantity of a viscous adhesive on an outer surface of the permanent magnet (01) which is foremost for insertion into the cavity (02);
• b) Applying a metered quantity of the viscous adhesive on an inner surface of the cavity (02) which is foremost for receiving the permanent magnet (01);
• and
• c) Inserting the permanent magnet (01) into the rotor cavity (02), to cause counter-shear and hence opposing displacement of the viscous adhesive applied respectively on the permanent magnet (01) and the cavity (02) to result in improved embedding of the permanent magnet (01) within the cavity (02), said improvement being characterised in that—
• the viscous adhesive is applied on mating surfaces of the permanent magnet (01) and the cavity (02) in either a bead or a ring configuration, any part of the same, or any combinations thereof in at least one pair of instances (04A and 04B) along an outer perimeter of the permanent magnet (01) near an end of the permanent magnet (01) that is first inserted into the cavity (02) and in at least another pair of instances (06A and 06B) on a mating inner perimeter surface of the cavity (02) near an opening of the cavity (02) that first receives the permanent magnet (01) when the permanent magnet (01) is inserted into the cavity (02);
• the viscous adhesive applied respectively on the permanent magnet (01) and the cavity (02) is uniformly spread and completely fills up a void space therebetween without any overflow through the counter-shear and opposing displacement of the viscous adhesive when the permanent magnet (01) is inserted into the rotor cavity (02);
• and
• strength of adhesive-based bonding achieved corresponds to a debonding force of 139.5 kg.