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Epoxy Systems for E-motors

Electric (traction) motor encapsulation with high Tg epoxy systems provides sufficient crack resistance at -40°C and good mechanical strength at the operating temperatures reaching 150 to 200°C. Motors where the magnetic field is electrically induced are very efficient at high rotational speeds and can provide exceptional acceleration. The encapsulation contributes to  fixation of the rotor coil wires to avoid unbalance leading to motor destruction.

Electrical (Traction) Motors

EPIKOTETM Resin SystemsCuring Conditions
Time[min]Temp[oC]Glass Transition
Temp [°C] (DSC Midpoint)
Process Typical Applications 
EPIKOTE Resin 05570
EPIKURE Curing Agent 05556
20 min in 140 °C
+ 2.5h postcure at 190 °C
200 °CAutomatic Pressure Gelation (APG)Encapsulation of coils and magnets in traction motors
 Remarks: Excellence performance at high operations temperature; excellent fracture toughness. Typical injection time < 5 minutes.
EPIKOTE Resin 870
EPIKOTE Curing Agent 879
120 min at 95 °C + 2h postcure at 120 °C80 °CVacuum Casting
Pressure Gelation
E-Drive encapsulation. High voltage connectors. In-wheel motors
 Remarks: System providing the highest fracture toughness and can resist cracking, even at extremely low temperatures. Typical injection time < 8 minutes.
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