AC shaded pole single phase induction pole motor

" snipped-for-privacy@gmail.com" 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: snipped-for-privacy@gmail.com 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.

--- sam | Sci.Electronics.Repair FAQ Mirror:

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motor"

program.For

vary

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.

Try to find an old book, the "GE SCR Manual". See also

pole

to

use

driving

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:

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.

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.

Or epoxy a small magnet and use a hall sensor.

LED

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.

or

other

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.

off

reluctance

the

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.

usually

to

pole

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