Synchronous motor

C

Carlos Saraiva

Guest
Hi

What is a 220VAC synchronous motor?
Is it a normal AC (2 or 3 wire) motor?

Thanks
Carlos
 
Carlos Saraiva wrote:
Hi

What is a 220VAC synchronous motor?
Is it a normal AC (2 or 3 wire) motor?

Thanks
Carlos
Click to expand...
Most AC motors are induction motors. That means that there is an eddy
current magnetic memory of sorts built into the rotor that holds some
of the field magnetism and gives the field something to work against.
This magnetic memory is constantly being refreshed as the motor turns,
but this process slips the memorized field slowly, causing the
induction motor to run a little slower than in synchronism with the
AC, with the slip increasing as the load torque increases.

Synchronous motors give the field a fixed magnetic structure to work
against. Either a chunk of iron with (salient) poles and spaces
between poles (synchronous reluctance) or permanent magnets. These
turn in strict synchronism with the line frequency, with only a phase
shift as load torque varies.

--
John Popelish
 
On Tue, 2 Dec 2003 14:51:16 -0000, "Carlos Saraiva"
<casaraiva@netcabo.pt> wrote:

Hi

What is a 220VAC synchronous motor?
Is it a normal AC (2 or 3 wire) motor?

Thanks
Carlos

Can be two or more wires depending on the number of phases and wiring
Click to expand...
used. Simplest form is two wire single phase as used in some record
turntables, clocks, tape decks, etc.. Slow Syn makes a line of three
wire low speed synchronous motors (essentially wound like stepper
motors) that require a cap and resistor to shift the phase for one
winding.


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Thanks.

Where can I find some schematics to learn more about this type of motors?

Carlos


"John Popelish" <jpopelish@rica.net> wrote in message
news:3FCCC3C3.5B65138B@rica.net...
Carlos Saraiva wrote:

Hi

What is a 220VAC synchronous motor?
Is it a normal AC (2 or 3 wire) motor?

Thanks
Carlos

Most AC motors are induction motors. That means that there is an eddy
current magnetic memory of sorts built into the rotor that holds some
of the field magnetism and gives the field something to work against.
This magnetic memory is constantly being refreshed as the motor turns,
but this process slips the memorized field slowly, causing the
induction motor to run a little slower than in synchronism with the
AC, with the slip increasing as the load torque increases.

Synchronous motors give the field a fixed magnetic structure to work
against. Either a chunk of iron with (salient) poles and spaces
between poles (synchronous reluctance) or permanent magnets. These
turn in strict synchronism with the line frequency, with only a phase
shift as load torque varies.

--
John Popelish
Click to expand...
 
Thanks.

Where can I find some schematics to learn more about this type of motors?

Carlos


"default" <R75/5@defaulter.net> wrote in message
news:6cprsvou29d29k84guoi6q7gp3do6hmtdl@4ax.com...
On Tue, 2 Dec 2003 14:51:16 -0000, "Carlos Saraiva"
casaraiva@netcabo.pt> wrote:

Hi

What is a 220VAC synchronous motor?
Is it a normal AC (2 or 3 wire) motor?

Thanks
Carlos

Can be two or more wires depending on the number of phases and wiring
used. Simplest form is two wire single phase as used in some record
turntables, clocks, tape decks, etc.. Slow Syn makes a line of three
wire low speed synchronous motors (essentially wound like stepper
motors) that require a cap and resistor to shift the phase for one
winding.


-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
-----== Over 100,000 Newsgroups - 19 Different Servers! =-----
Click to expand...
 
On Fri, 5 Dec 2003 09:52:23 -0000, "Carlos Saraiva"
<casaraiva@netcabo.pt> wrote:

Thanks.

Where can I find some schematics to learn more about this type of motors?

Carlos
Search for it
Click to expand...
how do synchronous motors work.
Results 1 - 10 of about 39,800.

http://pyanczer.home.mindspring.com/Tour/motordrv.html
http://howthingswork.virginia.edu/electric_motors.html
http://my.execpc.com/~rhoadley/magacmot.htm Easy with pictures


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http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
-----== Over 100,000 Newsgroups - 19 Different Servers! =-----
 
Carlos Saraiva wrote:
"John Popelish" wrote:
Carlos Saraiva wrote:

Hi

What is a 220VAC synchronous motor?
Is it a normal AC (2 or 3 wire) motor?


Most AC motors are induction motors. That means that there is an eddy
current magnetic memory of sorts built into the rotor that holds some
of the field magnetism and gives the field something to work against.
This magnetic memory is constantly being refreshed as the motor turns,
but this process slips the memorized field slowly, causing the
induction motor to run a little slower than in synchronism with the
AC, with the slip increasing as the load torque increases.

Synchronous motors give the field a fixed magnetic structure to work
against. Either a chunk of iron with (salient) poles and spaces
between poles (synchronous reluctance) or permanent magnets. These
turn in strict synchronism with the line frequency, with only a phase
shift as load torque varies.

Thanks.

Where can I find some schematics to learn more about this type of motors?
Click to expand...
I don't have a favorite site for this. But I have given you many of
the key words needed to do a Google search. (salient pole, synchronous
reluctance, permanent magnet, synchronous AC motor) Adding the key
word 'tutorial' is often useful.

--
John Popelish
 
Thanks for helping

Carlos


"default" <R75/5@defaulter.net> wrote in message
news:ph51tvgiqlvboku6tsh6fg0p4bvn13k03s@4ax.com...
On Fri, 5 Dec 2003 09:52:23 -0000, "Carlos Saraiva"
casaraiva@netcabo.pt> wrote:

Thanks.

Where can I find some schematics to learn more about this type of motors?

Carlos
Search for it
how do synchronous motors work.
Results 1 - 10 of about 39,800.

http://pyanczer.home.mindspring.com/Tour/motordrv.html
http://howthingswork.virginia.edu/electric_motors.html
http://my.execpc.com/~rhoadley/magacmot.htm Easy with pictures


-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
-----== Over 100,000 Newsgroups - 19 Different Servers! =-----
Click to expand...
 
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