(b) A 480 V, 100 kW, 50 Hz, four-pole, Y-connected synchronous motor has a rated power factor of 0.85 leading. At full load, the efficiency is 91 percent. The armature resistance is 0.08 2, and the synchronous reactance is 1.0 N. Assume this machine is operating at full load. (i) Calculate the input power and output torque. (ii) Calculate the mechanical speed, Nm. (iii) Find the internal generated voltage, EA and the armature current, |IA|. (iv) Find the Converted power, Pconv- (v) Determine the mechanical, core and stray losses, Pmesh + Pcore + Pstray:

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Solutioni-
Griven,
480V, 100KW, y pole, Y-Conneckd 8ynchronous
motor.
Power factor co8ø = 0.85
e thiciency n
- 91%
Ra
= 0 68 2
Input power Pi =?
output Powen
Pi
100 kW
=109-9kw
0.91
Input powen 109.9 kW
And
Dutput þowen
outbut torque =
50
1204
and w = 2A Ns
60
A不X450
= 507
120X50
%3D
- 1500YPM
2
tooX 10
= 636 94 Nm
Output torque
outbut torque = 6 36-94 Nm
Ang
i) Mechanical gpeed Nm = 1500 pm
Ang
Transcribed Image Text:Solutioni- Griven, 480V, 100KW, y pole, Y-Conneckd 8ynchronous motor. Power factor co8ø = 0.85 e thiciency n - 91% Ra = 0 68 2 Input power Pi =? output Powen Pi 100 kW =109-9kw 0.91 Input powen 109.9 kW And Dutput þowen outbut torque = 50 1204 and w = 2A Ns 60 A不X450 = 507 120X50 %3D - 1500YPM 2 tooX 10 = 636 94 Nm Output torque outbut torque = 6 36-94 Nm Ang i) Mechanical gpeed Nm = 1500 pm Ang
(b)
A 480 V, 100 kW, 50 Hz, four-pole, Y-connected synchronous motor has a rated power
factor of 0.85 leading. At full load, the efficiency is 91 percent. The armature resistance
is 0.08 N, and the synchronous reactance is 1.0 Q. Assume this machine is operating at
full load.
(i)
Calculate the input power and output torque.
(ii) Calculate the mechanical speed, Nm.
(iii) Find the internal generated voltage, EA and the armature current, |IA|.
(iv) Find the Converted power, Peonv-
(v)
Determine the mechanical, core and stray losses, Pmesh + Pcore + Pstray.
Transcribed Image Text:(b) A 480 V, 100 kW, 50 Hz, four-pole, Y-connected synchronous motor has a rated power factor of 0.85 leading. At full load, the efficiency is 91 percent. The armature resistance is 0.08 N, and the synchronous reactance is 1.0 Q. Assume this machine is operating at full load. (i) Calculate the input power and output torque. (ii) Calculate the mechanical speed, Nm. (iii) Find the internal generated voltage, EA and the armature current, |IA|. (iv) Find the Converted power, Peonv- (v) Determine the mechanical, core and stray losses, Pmesh + Pcore + Pstray.
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