Grade Description for Stepper Motor Insulation Materials and Heat Resisting Materials

UL classifies the certification grade of insulation system into Y A E B F H C from low to high according to heat-resistance temperature.
The followings are the maximum allowable operating temperature（℃）for each heat-resistance grade, which can be as the brief description for insulation materials of heat-resistance grades.

17HS19-2004S1


1.For grade Y material, the maximum temperature of best steppin motor is 90℃, which has such insulation structure that is composed with untreated spun cotton, silk, etc. or their combination, so it is not necessary to do any treatment before using.
2.For grade A material, the maximum temperature is 105℃, which has such insulation structure that is composed with treated or soaked dielectric medium, such as spun cotton, silk or paper, etc. soaked in transformer oil or their combination.
3.For grade E material, the maximum temperature is 120℃, which has such insulation structure that is composed with synthetic organic film, synthetic organic enamel, etc. or their combination.
4.For grade B material, the maximum temperature is 130℃, which has such insulation structure that is composed with mica, glass fiber, asbestos, etc. which are bonded, soaked or applied by proper resin and other inorganic materials, proper organic materials or their combination.
5.For grade F material, the maximum temperature is 155℃, which has such insulation structure that is composed with mica, glass fiber, asbestos, etc. which are bonded, soaked or applied by proper resin and other inorganic materials, proper organic materials or their combination.
6.For grade H material, the maximum temperature is 180℃, which has such insulation structure that is composed with mica, glass fiber, asbestos, etc. which are bonded or soaked by proper resin (e.g., organic silicon resin) and other inorganic materials, proper organic materials or their combination.
7.For grade C material, the maximum temperature is 180℃, which has such insulation structure that is composed with mica and glass fiber which are bonded, soaked or applied by proper resin and untreated mica, ceramics, quartz, etc. or their combination.

See more:
https://www.tripoto.com/trip/faq-of-linear-stepping-motor-basics-you-shold-know-5e427217da5ef
https://izistepperfaq.blogspot.com/2020/02/3-methods-to-reduce-high-temperature.html