Electrical Insulation Paper

1. Types of motor insulation paper

The motor insulation paper commonly used in motors is divided into six grades of A, E, B, F, H and C according to their heat resistance.

1. Class A insulation includes organic fiber materials such as impregnated cotton yarn, silk, paper, and enamel on ordinary enameled wire. Currently only used in transformers. The allowable operating temperature of Class A insulation is 105°C.

2. Class E insulation includes films made of polyester resin, epoxy resin, triacetate fiber, etc., enamel on polyvinyl acetal high-strength enameled wire, etc. Used in medium and small AC and DC motors. The allowable operating temperature of Class E insulation is 120°C.

3. Class B insulation includes mica, asbestos, glass wool and other inorganic materials made of organic paint or resin (with heat resistance treatment) as a binder and its composition, enamel on polyester high-strength enameled wire, etc. Generally, it is used in large and medium-sized synchronous machines and medium and small AC and DC motors. The allowable operating temperature of Class B insulating materials is 130°C.

4. Class F insulation includes mica, asbestos, glass wool and other inorganic substances modified with silicon organic compound synthetic resin paint, or materials made of alkyd and epoxy resins that meet the requirements of this grade as binders or other materials combination. The allowable working temperature of Class F insulation is 155°C.

5. Class H insulation includes materials made of organic silicon and inorganic materials such as mica, asbestos, and glass wool with silicon organic paint as a binder. It is mainly used in occasions where size reduction and weight reduction are required as much as possible, such as aviation motors, crane motors, traction motors, etc. The allowable working temperature of H-grade composite insulating paper is 180°C

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