The plastics used in the manufacture of commutation equipment generally include thermosetting plastics and thermoplastics. For various motors with different operating conditions, special requirements for use, such as temperature resistance, oil resistance, and mildew resistance, should also be considered when choosing. and so on special features.
Thermosetting plastics are mixed with thermosetting artificial resins and fillers. Commonly used fillers are powdery and fibrous (wood powder, quartz powder, mica powder, asbestos, glass wool and other fibers). Powdered plastics have good fluidity and mechanical properties. It has poor strength and is only used for small plastic reversing equipment. Fibrous plastic has high mechanical strength and poor fluidity. Phenol formaldehyde resin is the most commonly used plastic in plastics. It is characterized by a high degree of acid and alkali resistance. When hot pressed, it can quickly become insoluble and insoluble solid.
Motor commutators made of thermosetting plastics are mainly used in high temperature applications. The most commonly used thermosetting plastics are phenolic glass fiber pressed plastics, which are modified with glass fibers (disordered or oriented) dipped in Phenolic resin (carbonated formaldehyde resin), a fiber plastic made after drying, is a widely used plastic.