Previous in Forum: FCMA Soft Starter   Next in Forum: Causes of Tripping?
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
13 comments
Rating: Comments: Nested
ajoycr4
Member

Join Date: Dec 2011
Posts: 7

Starting of Synchronous Motor Using Cycloconverter and Converter

12/25/2011 2:47 AM

The main disadvantage of synchronous motor is that it is not self starting one.

The direction of electromagnatic torque changes after 0.02sec for 50hz supply. If we first start the motor with DC supply then switch it to AC supply then the phenomena of changing the direction of electromagnetic torque does not occur.
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#1

Re: Starting of Synchronous Motor Using Cycloconverter and Converter

12/25/2011 1:09 PM

That sounds like a load of cobblers.

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
tcmtech
Guru

Join Date: Jun 2009
Location: South of Minot North Dakota
Posts: 8376
Good Answers: 775
#2
In reply to #1

Re: Starting of Synchronous Motor Using Cycloconverter and Converter

12/25/2011 4:37 PM

I am leaning my guess toward loaded on Christmas weed and stumbled into a engineering forum while buzzed and web surfing.

Register to Reply
ajoycr4
Member

Join Date: Dec 2011
Posts: 7
#3
In reply to #1

Re: Starting of Synchronous Motor Using Cycloconverter and Converter

12/25/2011 9:50 PM

Excuse me sir ... what is wrong with this idea ???????.....
Register to Reply
tcmtech
Guru

Join Date: Jun 2009
Location: South of Minot North Dakota
Posts: 8376
Good Answers: 775
#4
In reply to #3

Re: Starting of Synchronous Motor Using Cycloconverter and Converter

12/25/2011 10:20 PM

An overwhelming lack of information relating to said motor and power source for starters.
Register to Reply
ajoycr4
Member

Join Date: Dec 2011
Posts: 7
#7
In reply to #4

Re: Starting of Synchronous Motor Using Cycloconverter and Converter

12/26/2011 3:32 AM

It is for all kind of synchronous motor(for all rating) and the power source for starter is any kind of 3ph ac supply.........
Register to Reply
Wal
Guru

Join Date: Jun 2011
Location: Phnom Penh
Posts: 4019
Good Answers: 102
#5
In reply to #3

Re: Starting of Synchronous Motor Using Cycloconverter and Converter

12/25/2011 11:23 PM

What is your question?......

Will this work?

Is my understanding correct?

How do synchronous motors start?

or something else?

__________________
 Difficulty is not an obstacle it is merely an attribute.
Register to Reply
ajoycr4
Member

Join Date: Dec 2011
Posts: 7
#8
In reply to #5

Re: Starting of Synchronous Motor Using Cycloconverter and Converter

12/26/2011 3:35 AM

yeah my question is will this work..... ??
Register to Reply
standarded
Guru
United States - Member - Member Hobbies - DIY Welding - New Member

Join Date: Mar 2008
Location: Southeast US of A
Posts: 555
Good Answers: 50
#6

Re: Starting of Synchronous Motor Using Cycloconverter and Converter

12/26/2011 12:17 AM

Do you have a question?

__________________
 Speak softly and carry a big stick.
Register to Reply
tcmtech
Guru

Join Date: Jun 2009
Location: South of Minot North Dakota
Posts: 8376
Good Answers: 775
#9

Re: Starting of Synchronous Motor Using Cycloconverter and Converter

12/26/2011 4:56 AM

Still not enough usable info. There are single phase and three phase synchronous motors all the way from clock motors that use less than a watt to multi megawatt units in industrial mills and what not. Obviously they are able to start somehow otherwise they would not be used.

So again what motors in specific and what power sources in specific otherwise we can assume you don't understand basic alternating current or electric motor design theory.
Register to Reply
ajoycr4
Member

Join Date: Dec 2011
Posts: 7
#11
In reply to #9

Re: Starting of Synchronous Motor Using Cycloconverter and Converter

12/26/2011 9:29 PM

I think motors used in clock is not synchronous motor it is either stepper motor or switch reluctance motor .... and i dont heard that a synchronous motor is used for clock....

I am talking about the large power rating 3ph synchronous motor....(generally)

Oviously there are many method of starting an synchronous motor.....


But this method will more user friendly and power saver.
Register to Reply
tcmtech
Guru

Join Date: Jun 2009
Location: South of Minot North Dakota
Posts: 8376
Good Answers: 775
#12
In reply to #11

Re: Starting of Synchronous Motor Using Cycloconverter and Converter

12/26/2011 10:36 PM

Nope the tiny electric motors on the old AC powered mechanical clocks are tiny single phase synchronous motors with gearbox's on them. Take one apart and see for yourself.

As far as large three phase synchronous motors go they can start on normal power just fine but tend to have very high initial inrush currents while getting up to speed. To limit or regulate the start up currents there are a number of ways to do that as well.

So what exactly is your point or question with this thread anyway?
Register to Reply
Wal
Guru

Join Date: Jun 2011
Location: Phnom Penh
Posts: 4019
Good Answers: 102
#13
In reply to #11

Re: Starting of Synchronous Motor Using Cycloconverter and Converter

12/26/2011 10:37 PM

Read this a few times and then rephrase your inquiry.

__________________
 Difficulty is not an obstacle it is merely an attribute.
Register to Reply
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#10

Re: Starting of Synchronous Motor Using Cycloconverter and Converter

12/26/2011 7:35 AM

It still sounds like a load of cobblers.

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
Register to Reply
Have a Different Question?
13 comments
Copy to Clipboard

Users who posted comments:

ajoycr4 (4); PWSlack (2); standarded (1); tcmtech (4); Wal (2)

Previous in Forum: FCMA Soft Starter   Next in Forum: Causes of Tripping?

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Electrical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (64 right now)
Show Members
Advertisement