in general a motor should not operate with temperatures above the maximum each 10oc rise above the rating may reduce the motor lifetime by one half temperature tolerance class b is the most common insulation class used on most 60hz usa motors50...

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pump motor type three phase squirrel cage power 75 kw speed 970 rpm 50 hz 1180 rpm rpm 60 hz poles 6 insulation class f protection class ip55 main crusher lubrication system system design closed circuit gravity return oil tank reservoir...

example a motor operating at 180 o c will have an estimated life of only 300 hours with class a insulation 1800 hours with class b insulation 8500 hours with class f insulation tens of thousands of hours with class h insulation temperature tolerance class b...

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classification of insulation for electric motor electric motor manufacture design the winding insulation class depend on technical aspect and user applicationfor good grade of insulationthe cost is higherso the engineer selects the electric motor based on...

of the windings do not exceed the limits set for class b this ensures less strain on the insulation from a thermal point of view therefore a longer service life for the motor given the ambient installation conditions constructions to class h are optionally available for which the respective...

nbsp018332the term utilised to class b temp rise provides the user with a degree of tolerance between f and b if motor protection devices such as ptc thermistors or kty80 temperature devices are fitted then the trip level will be at a class f temperature level 155degc and if you have thermistors fitted as well to provide a warning this is typically 10 degrees c below the trip level...

nbsp018332most likely the answer is insulation of the motor is designed to class f and temperature rise of the motor is restricted to class b under rated voltage frequency and full load condition that is to say there is a temperature buffer of 25 degree celcius 155c 130c...

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motor design a class b temperature rise is quite achievable for a 115 sf motor wound with class f insulation a class b temperature rise at full load translates to a thermal margin of 155 4090 = 25 c this means insulation life will be approximately 5 to...

class f b 155 c 80k safety margin 25k 150 c ptcs setting 2 c0 2 c0 2 c0 regal beloit bv mors 2 7150 aa eibergen the netherlands regalbeloiteu 2 c0 permissible temperature rise iec electric motors insulation class explanation title author...

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api 618 requires that the motor nameplate hp be 110 of the maximum operating condition bhp in addition it is good practice to ensure that the motor insulation is class f or better and the temperature rise is limited to class b rise at 10 service factor...