Normally, the motor insulation should have a lifespan of about 20 years if the motor under environmental conditions according to the design to remove them. If the temperature of the insulation to increase every 10 degrees Celsius (10oK) the lifetime of the insulation is shorter by approximately 50%, for example, according to the statistics. Class F insulation (155oC) leads to increased temperature usage by Class F (105oK) will have a lifespan of about 60,000 hours, but if the temperatures rise as Class B (80oK) have a lifespan of about 150,000.
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