IM For DC Machine

Republic of the Philippines
NUEVA VIZCAYA STATE UNIVERSITY

Bayombong, Nueva Vizcaya
INSTRUCTIONAL MODULE
IM No.:EE 4-1S-2020-2021
College: Engineering
Campus: Bambang
DEGREE Bachelor of COURSE NO. EE 4

PROGRAM Science in
Electrical
Engineering
SPECIALIZATION ELECTRICAL COURSE TITLE DC MACHINERY
MACHINES
YEAR LEVEL 4th Year TIME FRAME 5 WK NO. 1-2-3 IM NO. 01
Hrs/WK
I. UNIT TITLE/CHAPTER TITLE:
ELECTRICAL MACHINERY GENERALIZATIONS
II. LESSON TITLE:
DC GENERATOR
III. LESSON OVERVIEW:
Energy can neither be created nor be destroyed; we can only change its forms, using
appropriate energy-conversion processes .
Introduction to DC generators; Basic parts and functions of DC GENERATORS also includes
theoretical concept and derivation of formulas involve in propagation of electricity.
IV. DESIRED LEARNING OUTCOMES
1. The student must have a strong foundation on applied theories and principles of
DC machines currently used in the field as basic requirements of an electrical
system.
2. The student’s analytical skills and logical thinking was developed in exploring
recent technology and its application.
3. The student’s familiarity and technical skills in handling the different equipment
and apparatus to be used was developed.
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“ In accordance with Section 185. Fair use of a Copyrighted Work of Republic Act 8293, the copyrighted works included in this material may be reproduce for
educational purposes only and not for commercial distribution”
DISCLAIMER(whenever you find error/s in this module, please let me be the first to know before others)
IM No.:EE 4-1S-2020-2021
V. LESSON CONTENT
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PARTS OF DC GENERATOR
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VI. EVALUATION (Note: Not to be included in the student’s copy of the IM)
VII. LEARNING ACTIVITIES
1. Draw and illustrate on schematic diagram of an armature having 36 slots and 4 poles connected in
Lap winding.
2. Draw and illustrate on schematic diagram of an armature having 36 slots and 4 poles connected in
Wave winding.
3. How many coils are there in each case?
4. Indicate the front pitch and back pitch if it is connected in lap and wave winding.
5. Draw a design for a 4 pole duplex lap winding in 12 slots armature.
** see attached template format for activities**
IM No.:EE 4-1S-2020-2021
VIII. ASSIGNMENT
Perform what is being asked with compete solution (and schematic drawing if necessary).
1. A 4 pole, simplex wave wound generator has 57 slots, what is the coil pitch?
2. What is the commutator pitch of a 4 pole, duplex wave wound armature having 120 commutator bars?
3. The difference between the front pitch and the back pitch of retrogressive lap winding is 2. If the front pitch is 21,
what is the back pitch?
4. How many parallel paths there will be in the armature of a 10 pole machine if the armature is simplex lap wound?
5. What is the average voltage generated in a moving conductor if it cuts 2.5x10 6 maxwells in 1/40 second?
6. An 8 pole dc machine has a simplex wave wound armature with a current rating of 110A. determine the current
per paths.
7. A six pole dynamo, with interpoles, requires 360 conductors on its armature with 3 turns per coil and 2 coil sides
per slot . determine the number of coils , slots, and commutator bars.
8. When a generator is being driven at 1200rpm, the generated emff is 230V, what is the generated emf if the field
flux is decreased by 10% with the speed remain unchanged?
9. A separately excited generator has a noload terminal voltage of 230V when driven at 1200rpm with the field
current set to 10A. neglecting saturation, find the speed in rpm so that generated voltage is 200V with the field
current constant at 10A.
10. What is the voltage induced in the armature winding of a 4 pole wave wound dc machine having 728 active
conductors and running at 1600rpm? The flux per pole is 30mWb.
** see attached Template for Assignment format**
IX. REFERENCES
TEXTBOOKS:
SISKIND, C. S. (n.d.). ELECTRICAL MACHINES. McGRAW-HILL INTERNATIONAL BOOK COMPANY.
B.L. THERAJA, A. T. ( VOLUME II, 2005). ELECTRICAL TECHNOLOGY. NEW DELHI: S. CHAND AND
COMPANY LTD. (https://b-ok.asia/book/672020/d9fa45)
Numbering the IM No.: IM-CCCCCC-SSSSSS-NNNN-NNNN
School Year
Semester
Course Number
e.g.:
IM-COURSE NO-SEMESTER-SCHOOL YEAR
IM-MCB180-1STSEM-2020-2021
IM No.:EE 4-1S-2020-2021

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Republic of the Philippines

NUEVA VIZCAYA STATE UNIVERSITY

DEGREE Bachelor of COURSE NO. EE 4

I. UNIT TITLE/CHAPTER TITLE:

ELECTRICAL MACHINERY GENERALIZATIONS

II. LESSON TITLE:

III. LESSON OVERVIEW:

IV. DESIRED LEARNING OUTCOMES

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VII. LEARNING ACTIVITIES

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** see attached Template for Assignment format**

Numbering the IM No.: IM-CCCCCC-SSSSSS-NNNN-NNNN

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see attached Template for Assignment format