Old AC Motor varispeed, possible?
Old AC Motor varispeed, possible?
(OP)
Old homes heatilator has a fan assembly that is welded to it. The homeowner would like to either vari the speed or step it (low, med, high) but everything I have tried is giving me the same results. I suggested we replace the motor with one that is able to do what is wanted but the assembly is welded to the system.
The motor is a Dayton Electric E37403, rpm- 3160, 115 vac, 1.37 amps, 1.25 hp, type U21, No. 7021-3469 continuous duty, model 4C446 Thermally protected CA82, Class A ins.
The motor is in excellent shape, just not able to vari the speed. Is this motor capable and if so, what type of a controller can be used?
Thank you
The motor is a Dayton Electric E37403, rpm- 3160, 115 vac, 1.37 amps, 1.25 hp, type U21, No. 7021-3469 continuous duty, model 4C446 Thermally protected CA82, Class A ins.
The motor is in excellent shape, just not able to vari the speed. Is this motor capable and if so, what type of a controller can be used?
Thank you






RE: Old AC Motor varispeed, possible?
Check and repost your current /HP rating.
A fan regulator type control should work, if meets the current rating.
Plus what exaclty have you tried so far?
RE: Old AC Motor varispeed, possible?
I have tried a variable and a 3-speed ceiling fan switch, both rated at 5.0 amps.
With both the variable and the 3-speed switch I was not able to control the motor. I can set the fan at full speed and I can set the fan at a low speed, nothing in between. When I sit and tweak the speed of the motor, very carefully. It eventually just runs away and goes to full speed.
RE: Old AC Motor varispeed, possible?
Motor speed is not directly related to V.
In fact its only dependent on frequency and poles which remains constant. Resistive regulators for small ac motors essentially drop voltage down and limit the current (much energy is lost in heat)that the motor is bogged down, hence slows down.
It appears that your motor is lightly loaded and regulator characteristic do not match the motor to give you the desired speed control.
I am not sure single phase inverters, VFD, are available or even its cost will be justified for your application.
I am not initimately faimiliar with electronic fan regulator construction or theory..so will wait for someone else knowing it to respond.
RE: Old AC Motor varispeed, possible?
http://www.electricmotorwarehouse.com/
for Dayton motors more info
and also bring it to a motor repair shop to find where the problem is since the nameplate information is inconsistent.
RE: Old AC Motor varispeed, possible?
you'll find it here:
http://kingsolar.com/catalog/mfg/dayton/4c446.html
It's a Shaded Pole motor, 1.37 amps ...
NO HP LISTED for this motor... so Skieve posting of 1.25 HP might be erroneous...could it be 1.25 SF ???
MFGRs Data
No. 4C446 Shaded Pole Blowers - 148 CFM at RPM shown at 60Hz and 0inches SP, 1.37 Amps, 115 volts
Now, for a variable speed solution,
might I suggest that you investigate Anacon Systems, Inc
http://www.anaconsystems.com/text/singleov.html
who makes a variable speed controller for 1-phase, 115 vac, shaded pole motors and PSC motors.
HTH
jO
RE: Old AC Motor varispeed, possible?
I will dig around at the links I was given and see what I can come up with.
Thanks again,
Steve
RE: Old AC Motor varispeed, possible?
RE: Old AC Motor varispeed, possible?
http://www.hoffmancontrols.com/variflow.htm
RE: Old AC Motor varispeed, possible?
Thank you very much guys.
I will dig around at the links I was given and see what I can come up with.
Thanks again,
Steve
///That is good to know. However, JOmega posed a legitimate question whether or not 1.25 is aligned with HP or Service Factor (SF). Please, would you confirm that reading once again?\\\