Flame-retardant resins enable novel coupling
A
DuPont (UK) product story
Edited by the Engineeringtalk editorial team
Nov 25, 2005
The new Aegis shaft grounding coupling promises to protect motor bearings against electrical damage produced by shaft current.
The new Aegis shaft grounding coupling promises to protect motor bearings against electrical damage produced by shaft current.
Electro Static Technology, an ITW Company based in Mechanic Falls, Maine, produces the coupling using eight key housing and sealing parts moulded from glass-reinforced, flame-retardant grades of Du Pont Zytel HTN high-performance polyamide and Zytel nylon 66 resin.
Zytel HTNFR52G30BL, a PPA (polyphthalamide) resin, serves for a two-piece end cap located inside the assembled stator.
"These parts must withstand frictional heat generated by contact with the rotor during break-in and occasionally during subsequent operation", said William Oh, Business Unit Manager at Electro Static Technology.
Zytel nylon 66 is used for the slinger and five internal stator components.
The parts meet needs for a combination of high stiffness, strength and toughness plus dimensional stability, UL94V0 performance, resistance to breakdown by shaft current up to 10A, resistance to maximum operating temperatures up to 120C and moulding productivity.
Electro Static Technology rates the coupling for continuous operation up to 120C.
Typical operating temperatures are lower, however, about 65C, according to Oh.
During moulding, both the Zytel HTN and nylon 66 resins run consistently well with high yields and fast cycling, according to Dan Hutchens, President of Molding, Tooling and Design, Saco, Maine.
The end cap resin, Zytel HTN FR52G30BL, delivers a major advantage over several other high-temperature polymers in that it can be moulded in water-controlled tooling.
The nylon 66 resin is Zytel FR50.
"The Aegis shaft coupler provides a simple, cost-effective way to extend the life of bearings for AC motors controlled by variable-speed drives", said Oh.
By providing a continuous discharge path for shaft current generated by such motors, it combats the formation of fusion craters, which ultimately result in severe frosting and fluting.
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