Categories
Java Programming Statistics and Economics Computer science Effective Business Communication Biological Systems General Pharmacy Psycology & Sociology Managerial Economics Professional Communication for Pharmacists Business System Sociology Business Law Physics Languages Criminal Law Law Methods in Psychology Biochemistry Digital electronics Fundamentals of Operating Systems Advanced Computer Architecture Applied Physics Engineering Economics Medicine and Pharma Network Technologies and TCP/IP Civil procedure Engineering Materials Engineering Physics Management Information Systems Political sciences Microeconomics Economic Theory Management English Grammar Object Oriented Programming Law of Torts Electronics and Communication Literature and Communication United States Philosophy Boilers and Welding Analytical Chemistry Behavioural Science Computer Fundamentals Project Management Aerospace Engineering Business Administration Accounting Information System Analysis and Design Mathematics Fundamentals of Information Technology Statistics for Psychologists Consumer Behaviour Agronomy History Software Engineering Computer Programming Computer Architecture Human Resource Management Pharmacy Basic Electrical Engineering Political Science Operating System Advanced Physics Generic Pyhsics and AstroPhysics Botony Finance Internet and Java Programming Biology & Chemistry Admission tests Biostatistics Communication Skills Security Analysis Statistics Job and Internships Geochemistry Financial Management Data Communication and Computer Networks Questions on universities Introduction to the Science and Engg Developmental Psychology Social Psychology History & Philosophy Introduction to Business Business Management On Docsity Chemistry Computer Graphics and Animation The Physics of Everyday Life American (United States) History Soil Mechanics and Foundations Psychology Fuzzy Intelligence College Physics A Biology

What are the disadvantages of Permanent magnet DC Motor?

0 votes

May 15th, 2013 12:32
in Mechanical Engineering by daryth (Iowa State University (IA), Phylosophy)

What are the disadvantages of Permanent magnet DC Motor?

Hi, I have to give a presentation on DC Motor. I want to know about Various disadvantages of Permanent magnet DC Motor to include in my presentation. Can anyone help me?

6 Answers
0 votes

May 22th, 2013 09:00
mmadhav (Central University of Kerala, Physics)
Some iron (or an ore, alloy, or other material) that's its component atoms so ordered which the material exhibits properties of magnetism, like attracting other iron-containing objects or aligning itself in an external magnetic flux  

Please log in or register to add a comment.

0 votes

May 22th, 2013 12:47
alok-sarath (Acharya Nagarjuna University, Languages)
To imagine a magnet, denotes that evil influences will draw you from the road of honor. A woman might be luring one to ruin. Female, this dream foretells that protection and wealth will be showered upon her.  

Please log in or register to add a comment.

0 votes

May 30th, 2013 10:04
baisakhi (B R Ambedkar National Institute of Technology, Computer engineering)
Magnetic sheets which might be inserted with your printer can be found at office supply stores. These stores also carry magnetic sheets which can be placed on business cards. It may easily be cut to be able to sizes.  

Please log in or register to add a comment.

0 votes

May 30th, 2013 11:25
crazzy (University of North Bengal, Mechanical Engineering)
These are generally strips of flexible magnetic material that affix to the graphic or fabric panels and invite the panels to stay towards the channel bars. There is a & B polarity magnets. On some pop-up booths the A magnets affix to the channel bar, and also the B magnets affix to the panel  

Please log in or register to add a comment.

0 votes

May 30th, 2013 13:09
kaale (National Institute of Industrial Engineering, Electronic and electrical engineering)
Magnetic energy has been seen as to enhance restful sleep, relieve aches and discomforts, reduce anxiety, stimulate circulation, provide increased energy and balance, and assist the body more effectively restore and repair itself. A large wide variety of magnetic products available.

Please log in or register to add a comment.

0 votes

June 4th, 2013 14:09
aboil (Amity Business School, Accountancy)
"Some of the disadvantages of Permanent magnet DC motor are as follows:
 
1. Permanent magnets cannot produce as high a flux density as an externally supplied shunt field.
 
2. PMDC motors run the risk of demagnetization. The armature current IA in a dc machine produces a magnetic field of its own. The armature mmf subtracts from the mmf of the poles under some portions of pole faces and adds to the mmf under other portions of the pole faces, reducing the overall net flux in the machine.
 
3. In a PMDC machine the pole flux is just the residual flux in the permanent magnets. If armature current becomes very large, there is some risk that armature mmf may demagnetize the poles, permanently reducing and reorienting the residual flux in them.
 
4. Demagnetizing may also be caused by the excessive heating which can occur during prolonged periods of overload.
 
<a href=http://in.docsity.com/en-docs/DC_Motors-Electro_Mechanical_Systems-Lecture_Slides_>DC Motors</a>"

Please log in or register to add a comment.

Related questions
6 Answers
Answer
daryth (Iowa State University (IA), Phylosophy)
6 Answers
Answer
daryth (Iowa State University (IA), Phylosophy)
6 Answers
Answer
alfred67 (Toyota Technological Institute at Chicago (IL), Computer science)
6 Answers
Answer
daryth (Iowa State University (IA), Phylosophy)
Subjects