1) Allowable temperature rises are based upon a reference ambient temperature of 40oC. Operation temperature is reference temperature + allowable temperature rise + allowance for "hot spot" winding.
Example Temperature Tolerance Class F:
40 oC + 105 oC + 10 oC
= 155 oC
In general a motor should not operate with temperatures above the maximum. Each 10 oC rise above the rating may reduce the motor lifetime by one half. It is important to be aware that insulation classes are directly related to motor life.
Example - a motor operating at 180oC will have an estimated life of
Temperature Tolerance Class B is the most common insulation class used on most 60 cycle US motors. Temperature Tolerance Class F is the most common for international and 50 cycle motors.
Electrical units, amps and electrical wiring, wire gauge and AWG, electrical formulas and motors.
The dielectric strength of a material is the ability to the material to act as an insulator.
Electrical motors NEMA frame dimensions.
NEMA frame assignments.
National Electrical Code.
National Electrical Manufacturers Association.
NEMA enclosure standard for electrical motors.
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