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The armature resistance of a permanent-magnet DC motor has a value, Ra=222. When the motor is connected to a DC source.
Posted: Mon May 09, 2022 8:21 am
by answerhappygod
- The Armature Resistance Of A Permanent Magnet Dc Motor Has A Value Ra 222 When The Motor Is Connected To A Dc Source 1 (24.46 KiB) Viewed 26 times
The armature resistance of a permanent-magnet DC motor has a value, Ra=222. When the motor is connected to a DC source. Vt - 150V DC. When the rotor speed is Nr1 - 500 tp.m, a back Em.f. Eal = 50V is induced. Calculate the followings. (a) The starting current le when the motor is just connected to the supply: (2 marks) (2 marks) (b) The back Em..., Ea2, of the motor when the rotor speed Nr2 - 1000r.p.m; VBs.300 Supplementary Exercise Page 8 of 9 ( The armature current la2 for the motor runing at 1000 r.p. speed. (2 marks) (5 marks) (d) What would happen to the motor when the back E.m.f. increased and reaches the value of ve? (1.c. Ea=V:)