AC shaded pole single phase induction pole motor

"" 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.

A*s*i*m*o*v

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

 

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.

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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.

 

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/
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