March 2015

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HP Reliability: Consider oil-resistant cable terminations to increase electric motor reliability

Most engineers are familiar with adhesive-coated insulating tape used by electricians in the field and maintenance shop. If we use this tape in the engine compartment of an automobile, it will soon be..

Bloch, Heinz P., Hydrocarbon Processing Staff

Most engineers are familiar with adhesive-coated insulating tape used by electricians in the field and maintenance shop. If we use this tape in the engine compartment of an automobile, it will soon become gummy and will unravel. Although a common product will suffice in most applications, “standard” stretchable insulating tape will not serve well as an oil-resistant cable termination. Oil resistance is an important consideration, especially regarding terminal boxes of oil-mist-lubricated electric motors. However, excessive swelling can occur near the stator windings, thus impeding motor cooling effectiveness, as shown in Fig. 1.     Fig. 1. Swelling cable te

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