Determine the shaft power output:

A 6-pole, 50 Hz, 3-phase induction motor running on full load develops a useful torque of 180 Nm when the rotor emf frequency is 2 Hz. Determine the shaft power output. If the mechanical torque lost in friction and that for core-loss is 12 Nm, determine

(a) the input to the motor, and

(b) efficiency.

The total stator loss is 900 W.

Solution

f₂  = S f  = 2

S =  2 /50 = 0.04

N _s   = (120 × 50 )/6= 1000 RPM

N_r  = (1 - S ) N _s  = (1 - 0.04) 1000 = 960 RPM

ω _r = (2 π× 960 )/60 = 100.53 rad/s

Shaft power output = 180 × 100.53 = 18.095 kW

Mechanical power developed = (180 + 12) × 100.53 = 19.301 kW

P _m   = Rotor copper loss ( (1/S) - 1)

Rotor copper loss = P_m (S/(1-S) = 19.301 (0.04/(1-0.04) = 0.804 kW

(a) Input to the motor = 19.301 + 0.804 + 0.9 = 21.005 kW

(b) Efficiency of motor = 18.095 × 100 = 86.14%

Posted Date: 2/5/2013 4:25:59 AM | Location : United States

Ask an Expert

Related Discussions:- Determine the shaft power output, Assignment Help, Ask Question on Determine the shaft power output, Get Answer, Expert's Help, Determine the shaft power output Discussions

Write discussion on Determine the shaft power output
Your posts are moderated

Write your message here..

Related Questions

Develop and execute a p spice program, Q. In the circuit shown in Figure th... Q. In the circuit shown in Figure the switch opens at t = 0. Develop and execute a P Spice program to solve for v(t), and use PROBE to obtain a plot of v(t). Hint: Use the follo

Second quadrant or class b chopper, Second Quadrant or Class B Chopper ... Second Quadrant or Class B Chopper Class B  chopper  is shown in figure in this  type of  chopper load  must contain  a dc source E ( may  be battery or a DC motor)  and induct

Physics, what is the significant of damping coficient what is the significant of damping coficient

Determine the critical load, A rocket on a test stand is modeled as a colum... A rocket on a test stand is modeled as a column clamped at x = 0 and free at x = L, and subjected to compressive force P applied at the free end. The direction of load P remains

moving average model, Altavox is a manufacturer and distributor of a lot o... Altavox is a manufacturer and distributor of a lot of electronic instruments and devices, including digital/analog multimeters, function generators, oscilloscopes, frequency counte

Half subractor, explanation explanation

What is the size of ports in 8255, What is the size of ports in 8255? P... What is the size of ports in 8255? Port-A : 8-bits Port-CU : 4-bits Port-B : 8-bits Port-CL : 4-bits

What do you mean by sign bit, Q. What do you mean by Sign Bit? The sign... Q. What do you mean by Sign Bit? The sign bit is like simple as it gets 0 denotes a positive number and 1 denote a negative number and flipping the value of this bit flips the

Volatage methods, homework help homework help

Explain the purposes of modulation and demodulation, Question The diagr... Question The diagrams below depict a modulation (left) and a demodulation(right). (a) Express y(t), u(t) and z (t). (b) What may happen to the demodulated signal y