DC Motor Problems: Examples 7-10 (Motors #9)

[@learnwithanengineer3703]

thank you all of these so much

[@skyhyrevamonte4189]

Find the efficiency of DC compound motor (long shunt); armature current (101.3 A), rotate at (1800 rpm), total no. of armature conductor (476), flux/pole (0.015 wb), no. of parallel path (p=2), shunt field resistance (150Ω), series field resistance (0.04Ω), armature resistance (0.1Ω), rotational losses at load (1827W).

[@skyhyrevamonte4189]

How to solve this problem?😁

[@karanrai4448]

How to calculate armature current and field current of dc shunt motor?

[@LeninAgrinzone]

hello teacher, thanks for this excercises, can you please help me with this excersice: Two identical series DC machines have the following characteristics: 220 [V], 12 [HP], 1200 [rpm], Ra =0.25Ω and 𝑅f=0.5ΩThe shafts of both machines are coupled, with one of them supplied at 230 [V] to operate as a series motor, while the other works as a shunt generator loaded with a resistance 𝑅 Calculate: a) The resistance 𝑅 so that the motor operates at full load (b) The efficiency of the generator set (c) Comment on how the load is supplied.

[@VarunKumar-eh6xc]

The maximum efficiency of a d.c. motor occurs is 3/4th full-load. The constant losses are 900 watts. Then the full-load copper losses are: 1) 1200 watts 3) 1800 watts 2) 1600 watts 4) 2000 watts Answer please 🥺🥺

[@Maybe.019]

thank you

[@EmberKnight898]

thanks

[@adanner]

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[@gala3554]

my 12v dc motor runs and stops for some miliseconds then runs again i dont even know whats the issue