![]() Some torque is lost, and therefore, shaft torque is always less than the armature torque. joule per kilogram: J/kg specific energy: m 2 s 2: joule per cubic metre: J/m. Ta ∝ Φ.Iaĭue to iron and friction losses in a dc machine, the total developed armature torque is not available at the shaft of the machine. radian per second: rad/s angular velocity: s 1: radian per second squared. Thus, armature torque is directly proportional to the product of the flux and the armature current i.e. The term (PZ / 2πA) is practically constant for a DC machine. Therefore, Ta × 2πN/60 = (PΦNZ / 60A) × Ia dynes grams joules / cm INTO MULTIPLY BY 28.87 TO CONVERT radians 4.732 × 10-4.Therefore, mechanical power = electrical power The mechanical power developed in the armature is converted from the electrical power,.The power developed in the armature can be given as, Pa = Ta × ω = Ta × 2πN/60.Net power developed in the armature = P = T × ω (Joules per second) 2.1īut, F × r = T and 2πN/60 = angular velocity ω in radians per second. = (F × 2πr × N) / 60 (Joules per second). Net power developed in the armature = word done / time.Work done by this force in once revolution = Force × distance = F × 2πr (where, 2πr = circumference of the armature).Torque T = F × r (N-m) …where, F = force and r = radius of the armature. ![]() The watt is named in honor of James Watt (17361819), an 18th-century Scottish inventor, mechanical engineer, and chemist who. 1 2 3 It is used to quantify the rate of energy transfer. Torque is given by the product of the force and the radius at which this force acts. The watt (symbol: W) is the unit of power or radiant flux in the International System of Units (SI), equal to 1 joule per second or 1 kgm 2 s 3. When armature conductors of a DC motor carry current in the presence of stator field flux, a mechanical torque is developed between the armature and the stator. Therefore, for simplex wave wound dc generator, Eg = PΦNZ / 120 Therefore, for simplex lap wound dc generator, Eg = PΦNZ / 60Pįor simplex wave winding, number of parallel paths is equal to 2 (i.e P=2), The conductors are connected in series per parallel path, and the emf across the generator terminals is equal to the generated emf across any parallel path.įor simplex lap winding, number of parallel paths is equal to the number of poles (i.e. 2)Ībove equation-2 gives the emf generated in one conductor of the generator. 1, emf generated per conductor = dΦ/dt = PΦN/60 (Volts) ….(eq.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |