Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Old April 25th 05, 05:20 AM
 
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Default AC shaded pole single phase induction pole motor

Sir/Madam

i have a dayton a.c. shaded pole single phase motor with 1/150HP,
3000
RPM, 230 V, 60 Hz frequency and Full Load Amps
0.24 . I want to control the torque of this motor through program.For
that i have feedback from motor is current to the motor . I want to
control the torque use this current as feedback.for that I need a
equation connecting torque and the current.


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Old April 25th 05, 10:00 PM
Sam Goldwasser
 
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Default

"Asimov" writes:

" bravely wrote to "All" (24 Apr 05 21:20:34)
--- on the heady topic of "AC shaded pole single phase induction pole motor"

an From:
an Xref: aeinews sci.electronics.repair:46513

an Sir/Madam

an i have a dayton a.c. shaded pole single phase motor with 1/150HP,
an 3000
an RPM, 230 V, 60 Hz frequency and Full Load Amps
an 0.24 . I want to control the torque of this motor through program.For
an that i have feedback from motor is current to the motor . I want to
an control the torque use this current as feedback.for that I need a
an equation connecting torque and the current.

RPM of this motor type is dependant on frequency. Altering the voltage
will only give approximately 10% practical change in torque.


While most induction motors are run at nearly constant speed, for shaded
pole motors with a light load like a fan, the torque and thus speed can vary
from near zero to almost synchronous speed based on input voltage. I use a
Variac to control my window fan. It works very well.

--- sam | Sci.Electronics.Repair FAQ Mirror:
http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is
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contact me via the Feedback Form in the FAQs.
  #5   Report Post  
Old April 26th 05, 05:48 AM
NSM
 
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Default


wrote in message
oups.com...
Sir/Madam

i have a dayton a.c. shaded pole single phase motor with 1/150HP,
3000
RPM, 230 V, 60 Hz frequency and Full Load Amps
0.24 . I want to control the torque of this motor through program.For
that i have feedback from motor is current to the motor . I want to
control the torque use this current as feedback.for that I need a
equation connecting torque and the current.


Try to find an old book, the "GE SCR Manual". See also
http://www.unusualresearch.com/

--
N



















  #6   Report Post  
Old April 26th 05, 07:36 AM
N Cook
 
Posts: n/a
Default

"James Sweet" wrote in message
news:[email protected]

"Sam Goldwasser" wrote in message
...
"Asimov" writes:

" bravely wrote to "All" (24 Apr 05 21:20:34)
--- on the heady topic of "AC shaded pole single phase induction

pole
motor"

an From:
an Xref: aeinews sci.electronics.repair:46513

an Sir/Madam

an i have a dayton a.c. shaded pole single phase motor with

1/150HP,
an 3000
an RPM, 230 V, 60 Hz frequency and Full Load Amps
an 0.24 . I want to control the torque of this motor through

program.For
an that i have feedback from motor is current to the motor . I want

to
an control the torque use this current as feedback.for that I need a
an equation connecting torque and the current.

RPM of this motor type is dependant on frequency. Altering the voltage
will only give approximately 10% practical change in torque.


While most induction motors are run at nearly constant speed, for shaded
pole motors with a light load like a fan, the torque and thus speed can

vary
from near zero to almost synchronous speed based on input voltage. I

use
a
Variac to control my window fan. It works very well.



As will a simple light dimmer in most cases, though some don't like

driving
inductive loads. Speed controllers for shaded pole motors are widely
available and they're nothing more than a triac dimmer circuit.



I tried this once with as a mod to drying fans in a photographic print
processor
and there was a cyclic revving / slowing effect rather than constant
RPM.


  #7   Report Post  
Old April 26th 05, 01:56 PM
Sam Goldwasser
 
Posts: n/a
Default

"James Sweet" writes:

"Sam Goldwasser" wrote in message


While most induction motors are run at nearly constant speed, for shaded
pole motors with a light load like a fan, the torque and thus speed can

vary
from near zero to almost synchronous speed based on input voltage. I use

a
Variac to control my window fan. It works very well.


As will a simple light dimmer in most cases, though some don't like driving
inductive loads. Speed controllers for shaded pole motors are widely
available and they're nothing more than a triac dimmer circuit.


Though they will probably have some slighlty modified phase characteristics
when called a motor controller. For a very small shaded pole motor load,
a normal light dimmer may behave strangely.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is
ignored unless my full name is included in the subject line. Or, you can
contact me via the Feedback Form in the FAQs.
  #8   Report Post  
Old April 27th 05, 01:08 PM
[email protected]
 
Posts: n/a
Default

could u please suggest me a sensor ,to measure the speed of the rotor
in an easiest way

  #9   Report Post  
Old April 28th 05, 03:53 AM
James Sweet
 
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Default


wrote in message
oups.com...
could u please suggest me a sensor ,to measure the speed of the rotor
in an easiest way


Paint half the shaft black and epoxy a reflective opto sensor or an IR LED
and photodiode next to each other on top of the motor so you get a pulse
every time the shaft goes around.


  #10   Report Post  
Old April 28th 05, 05:49 AM
NSM
 
Posts: n/a
Default


"James Sweet" wrote in message
news:[email protected]

Paint half the shaft black and epoxy a reflective opto sensor or an IR LED
and photodiode next to each other on top of the motor so you get a pulse
every time the shaft goes around.


Or epoxy a small magnet and use a hall sensor.
--
N



















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