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11. What is the safe limit of the body temperature of the motor? As per insulation class of the winding. Please refer relevant chart for insulation in the related section on this web site. 12. What is the significance of Ambient Temperature on performance of the motor? Increase in ambient temperature will affect the output/KW of the motor. 13. What is the difference between Class ‘B’ and Class ‘F’ insulations ? Which is better ? Temperature withstanding capacity of the motor winding differs with the class of insulation material used. Class ‘B’ insulation temperature limit is 130 0C. Class ‘F’ insulation temperature limit is 155 0C. Naturally Class ‘F’ is better than Class ‘B’. 14. Can the motor winding withstand heavy fluctuations in the supply voltage ? What is the effect of surges on the winding ? Yes, to a certain limit. Apart from insulation failure, mechanical stresses also take place due to voltage surges in motor winding. 15. At what minimum supply voltage the motor can be safely started without harmful effect on the winding? 90 % of rated voltage. 16. What is the minimum time required by the motor to attain full speed at the rated load? As per IS 325. 17. What are the percentage efficiencies of the motor at full, half and quarter loads? Please refer the performance chart for the relevant motor in the related section on this web site. 18. What is the motor power factor at full, half and quarter load? Please refer the performance chart for the relevant motor in the related section on this web site. 19. What is the value of per phase winding resistance of the motor? Please refer the performance chart for the relevant motor in the related section on this web site. 20. What is the rated speed of the motor? Please refer the performance chart for the relevant motor in the related section on this web site. |