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AC shaded pole single phase induction pole motor

A

Asimov

Jan 1, 1970
0
"[email protected]" 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: [email protected]
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.

A*s*i*m*o*v

.... Engineers do it to maximum stress loads.
 
S

Sam Goldwasser

Jan 1, 1970
0
Asimov said:
"[email protected]" 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: [email protected]
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/
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J

James Sweet

Jan 1, 1970
0
Sam Goldwasser said:
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.
 
N

N Cook

Jan 1, 1970
0
James Sweet said:
pole use


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.
 
S

Sam Goldwasser

Jan 1, 1970
0
James Sweet said:
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.
 
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