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Unformatted text preview: ELECTRICAL ENGINEERING DEPARTMENT
California Polytechnic State University BB 255 Assignment #6 Problem #1 .
A dc test is performed on a 208V, Yconnected induction mot0r. Each phase of _ the machine is made of two parallel windings. Ifthe Vdc=9V and IdczﬁA, what is
the resistance of each winding? Problem #2 _
A 220V, threephase, 60Hz induction motor is running at a speed of 1140 rpm. Determine:
The number of poles of the machine The speed of the magnetic ﬁeld
The slip of the machine
The slip speed P950?“ Problem #3
A 208V, threephase, 4pole, 50Hz induction motor is running at a slip of 4%.
Determine: 1. The speed of the magnetic ﬁeld 2. The speed of the rotor 3. The slip speed Problem #4 . I
A 208—V, three—phase, lZpole, 60—Hz induction motor is running at a slip of 4%.
Determine: 
‘ 1. The speed of the magnetic ﬁeld
4. The speed of the rotor
5. The slip speed Problem #5
A 220V, threephase, 2pole, 50Hz induction motor is running at a slip of 5%._
' Determine: _
5. The speed of the magnetic ﬁeldin RPM
6. The speed of the rotor in RPM
7. The slip speed of the rotor
8. The rotor frequency in Hz. Problem #6
Answer the questions of problem 5 for a 480V, threephase, 4pole, 60Hz‘
induction motor running at a slip of 0.035. Problem #7 A threephase, 4pole, 60Hz induction motor is running at a noload speed of
1790 RPM and a fullload speed of 1720 RPM. Calculate the slip and the ‘ I electrical frequency of the rotor at no«load andfullload conditions. What is the
speed regulation of this motor? Problem #8
A 208—V, threephase, 2p01e, 60—‘Hz Yconnected wound rotor induction motor is
rated at 15 hp. Its equivalent circuit components are: R1=0.2 Ohms R2=0.12 OhmsXm=15.0 Ohms
X1=0.4l Ohms X2=0.41 Ohms
 Pmech=250 W P stray: P coreEO
For a slip of 0.05, ﬁnd: The line current IL The stator copper loss PSCL The airgap power P AG The converted power PC.mv The induced torque Tind The load torque Thad The overall machine efﬁciency The motor Speed in RPM and rad/second Frorhesus??? Pad No. 937 811E
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This homework help was uploaded on 04/07/2008 for the course EE 255 taught by Professor Shaban during the Fall '05 term at Cal Poly.
 Fall '05
 Shaban

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