01 October 2008
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Electric motors: bonding of components

The 1359E adhesive, recently introduced by ThreeBond Europe, is stated to be especially suited to use in electric motors.

"It is a quick-curing, one-component reactive product and can be used, for example, in the bonding of ferrite magnets in all types of motor - from prime mover to servo or computer drives and other micro electronics", explains Mike Beeson. He sees the 1359E as being part of a trend in which acrylics are replacing epoxies (for example, for bonding ferrite to rotor in stepping motors) and anaerobic adhesives bonding plastic magnets as well as metals.

"The combination of anaerobic and heat curing makes it universally applicable, particularly for the assembly and repair, as well as for the industrial manufacturing of high-strength elastic joints with large gaps. Polymeric curing is effected quickly - for example, ten minutes at 120ºC - producing a flexible resin that provides good sealing and excellent resistance to the adverse effects of heat, moisture, and vibration."

Typical adhesive applications in electric motors include the bonding of bearings, shaft to rotor, magnet to rotor, wires to coil, thermal conductive components, as well as for the prevention of screws from loosening and the protection of electronic parts. In particular, hard disc drive motors employ zero outgassing adhesives for the fixing of wires, bonding of magnets, and for sealing connectors.

ThreeBond will be exhibiting at the Fastening & Assembly Solutions Show, National Motorcycle Museum, 23 October

Paul Gay

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