Feature

Thriving under pressure: the VPI treatment for motor windings

Electric motors, although relied upon for their durability in aggressive operating environments, can be surprisingly delicate. David Bevilacqua, Technical Manager for HV Motors and Coils at ERIKS UK & Ireland, explains how opting for Vacuum Pressure Impregnation (VPI) could be the solution to ensure they are protected and perform as they should.

03/09/2018 10:07:27

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In aggressive environments where electric motors are regularly exposed to high temperatures alongside wet and corrosive substances, the insulation materials they are constructed from can quickly degrade
over time.

Therefore, in order to keep these critical components operational, contamination and moisture ingress should be prevented where possible. Both contamination and moisture can create tracking paths
through the winding, allowing electrical leakage to earth and, eventually, a motor to trip. For a motor to stand the test of time then, the insulation resistance must
be maintained.

Thankfully though, there are some simple solutions whereby motors can be treated to resist moisture. These include dipping the winding in a polyester or epoxy resin
to create a moisture-resistant coating, or a process called Vacuum Pressure Impregnation (VPI). Our experience suggests the latter is the most effective.

Read the full article in the September issue of DPA

Written By Sophia Bell

Sophia Bell is the Group Editor of DPA, Connectivity, and PBSI. She joined the team in 2020 as Assistant Editor after achieving a First-Class Honours BA in English Literature and Film Studies from the University of East Anglia. In her current role, she leads the editorial strategy, driving digital growth and ensuring each title continues to deliver trusted, relevant insight for engineering and manufacturing professionals.