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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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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Sam Goldwasser
 
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"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
ignored unless my full name is included in the subject line. Or, you can
contact me via the Feedback Form in the FAQs.
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NSM
 
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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



















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N Cook
 
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"James Sweet" wrote in message
news:0Shbe.4340$Nc.2409@trnddc05...

"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.


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

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James Sweet
 
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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.


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NSM
 
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"James Sweet" wrote in message
news:6fYbe.12995$Nc.6863@trnddc09...

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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James Sweet
 
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"NSM" wrote in message news:fXZbe.8214$HR1.2086@clgrps12...

"James Sweet" wrote in message
news:6fYbe.12995$Nc.6863@trnddc09...

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.
--



That would work too, though I would be concerned the magnet would fly off or
cause vibration. It is less sensitive to dirt though. A metal gear or other
toothed object on the shaft (cooling fan in the motor?) and a reluctance
pickup might work too.


  #12   Report Post  
NSM
 
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"James Sweet" wrote in message
news:n3_be.6443$Yc.5945@trnddc06...

That would work too, though I would be concerned the magnet would fly off

or
cause vibration. It is less sensitive to dirt though. A metal gear or

other
toothed object on the shaft (cooling fan in the motor?) and a reluctance
pickup might work too.


The magnet has been used on autos for a long time. You could also drill the
shaft and drive a roll pin through it - 2 pulses per revolution to a
reluctance pickup. But we still don't know why the OP wants to do this.
--
N

















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James Sweet
 
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"NSM" wrote in message news:6I_be.8261$HR1.3763@clgrps12...

"James Sweet" wrote in message
news:n3_be.6443$Yc.5945@trnddc06...

That would work too, though I would be concerned the magnet would fly

off
or
cause vibration. It is less sensitive to dirt though. A metal gear or

other
toothed object on the shaft (cooling fan in the motor?) and a

reluctance
pickup might work too.


The magnet has been used on autos for a long time. You could also drill

the
shaft and drive a roll pin through it - 2 pulses per revolution to a
reluctance pickup. But we still don't know why the OP wants to do this.
--



Speed regulation on a shaded pole motor I'm assuming, though they're usually
used in fans and such that don't need regulation but it shouldn't be hard to
provide it.

Although they're horribly inneficient I do like many aspects of shaded pole
motors.


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NSM
 
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"James Sweet" wrote in message
news:is7ce.2598$iZ1.1264@trnddc03...

Speed regulation on a shaded pole motor I'm assuming, though they're

usually
used in fans and such that don't need regulation but it shouldn't be hard

to
provide it.

Although they're horribly inneficient I do like many aspects of shaded

pole
motors.


They're OK for a lot of jobs. Another choice is PSC.
--
N

















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