State the insulating materials used in motor. Write temperature class and withstand temperature ranges for them.
The insulating materials used in motor are as belows:
1. Cotton,
2. Silk, or paper,
3. Press board,
4. Resins
5. PVC
6. Cellulose-Fiber,
7. Enameled coating, etc
|
Insulation Classes |
Maximum permissible temperature (°C) |
Materials |
|
Class-Y |
90° |
cotton, silk, or paper, press board, vulcanized fiber, wood, celluloseFiber, PVC VIR etc without impregnating substance |
|
Class- A |
105° |
cotton, silk, or paper, press board, vulcanized fiber, wood, with impregnated varnish or insulation oil |
|
Class- E |
120° |
Superior wire enamels based on polyvinyl ferrul or epoxy resins, moudling with cellulose fibers, cotton fabric and paper laminates. |
|
Class- B |
130° |
Glass fiber, asbestos, Mica, Varnished glass fiber textile, built up mica |
|
Class- F |
155° |
adhesives, silicone, and alkyd-resin varnish of higher thermal endurance and: Glass fiber, asbestos, Mica, Varnished glass fiber textile, built up mica |
|
Class- H |
180° |
Combination of materials such as mica, glass, fiber, asbestos, with suitable high resistive bonding material like silicon |
|
Class- C |
Over 180° |
Mica, porcelain, ceramics, glass quartz, asbestos, treated glass fiber or treated asbestos. etc. |