Maurice Tutor

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Teaching Since: May 2017
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  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 12 Jan 2018 My Price 8.00

value of the rotor

7-18.      A 208-V, 60 Hz, six-pole Y-connected 25-hp design class B induction motor is tested in the laboratory, with the following results:

No load:           208 V, 22.0 A, 1200 W, 60 Hz

Locked rotor:   24.6 V, 64.5 A, 2200 W, 15 Hz

DC test:            13.5 V, 64 A

Find the equivalent circuit of this motor, and plot its torque-speed characteristic curve.

7-19. A 208-V four-pole 10-hp 60-Hz Y-connected three-phase induction motor develops its full-load induced torque at 3.8 percent slip when operating at 60 Hz and 208 V. The per-phase circuit model impedances of the motor are

R1    = 0.33 W                  X M   = 16 W

X1  = 0.42 W                 X 2  = 0.42 W

 

Mechanical, core, and stray losses may be neglected in this problem.

(a)     Find the value of the rotor resistance R2 .

(b)     Find t max , smax , and the rotor speed at maximum torque for this motor.

(c)     Find the starting torque of this motor.

(d)     What code letter factor should be assigned to this motor?

Answers

Maurice Tutor
(5)
Status NEW Posted 12 Jan 2018 08:01 PM My Price 8.00

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