A motor manufacturer´s evaluation of electrical insulating materials

Regardless of elaborate and complete test procedures by both insulating materials manufacturers and the OEM´s laboratory facilities, materials are frequently submitted which are not suitable for production usage. Some of the new materials developed in recent years on the basis of laboratory test data leave much to be desired for actual production. This is caused, in most instances, because many insulating material manufacturers are not familiar with motor production practice or, they strive so hard for the optimum technical properties in materials that they fail to see the possible production problems their materials will create. This is a tragic condition and production methods changes or even basic design changes bar the use of excellent materials due to the wrong mechanical properties being developed. It is to the mutual advantage of the manufacturer of insulation, its vendor and, the OEM to evaluate and develop material properties and industry standards as a team in close cooperation with each other.