Electrical Engineering - Doerr AC motor Old

Author

Doerr AC motor Old

Protagonist

2008-03-08, 1:25 pm

We have this old (60's?) Doerr AC motor 115V, (Model 60455/E 801)
1/3 HP, single phase and we would like to buy a controller for it.
But the seller wants to know, if it's split capacitor or split phase AC
motor.
I can't find any information on this AC motor and the company Doerr is
out of business a long time.
Any help, I would appreciate it.
JS

Ben Miller

2008-03-15, 5:25 pm

Protagonist wrote:
> We have this old (60's?) Doerr AC motor 115V, (Model 60455/E 801)
> 1/3 HP, single phase and we would like to buy a controller for it.
> But the seller wants to know, if it's split capacitor or split phase
> AC motor.
> I can't find any information on this AC motor and the company Doerr is
> out of business a long time.
> Any help, I would appreciate it.
> JS

Does it have a big metal cylinder bulging out from it somewhere around the
body? If so, it is a capacitor start motor.
If not, it is probably a split phase, although if it has more than two wires
coming out it might have used a remote capacitor.

What kind of controller are you looking for? For on/off controls such as
switches or contactors, it really shouldn't matter. Any control rated 1/3 HP
or more at 120 volts will be fine.

--
Benjamin D Miller, PE
www.bmillerengineering.com

James Sweet

2008-03-16, 3:25 am

"Ben Miller" <Ben@somewhere> wrote in message
news:13togos3iocsi1c@corp.supernews.com...
> Protagonist wrote:
>
> Does it have a big metal cylinder bulging out from it somewhere around the
> body? If so, it is a capacitor start motor.
> If not, it is probably a split phase, although if it has more than two
> wires coming out it might have used a remote capacitor.
>
> What kind of controller are you looking for? For on/off controls such as
> switches or contactors, it really shouldn't matter. Any control rated 1/3
> HP or more at 120 volts will be fine.
>

The presense of the capacitor alone isn't enough to tell. Capacitor start
and permanant split capacitor motors both have them.

Ben Miller

2008-03-16, 1:25 pm

James Sweet wrote:
> "Ben Miller" <Ben@somewhere> wrote in message
> news:13togos3iocsi1c@corp.supernews.com...
> The presense of the capacitor alone isn't enough to tell. Capacitor
> start and permanant split capacitor motors both have them.

True, but a PSC motor would also need a run cap, which would be a larger
oil-filled capacitor either mounted remotely,or strapped to the motor. A
bulge in the motor housing would most likely be a start capacitor, making
the motor a capacitor start induction run, if there is no other capacitor.
Even with no visible capacitor on the motor, there could be a permanent run
capacitor located somewhere else. Lots of possibilities.

I am not sure there is any difference with regard to what the control seller
is asking the op, which seemed to relate to capacitor vs. split phase. There
would be no capacitor in a split phase motor.

--
Benjamin D Miller, PE
www.bmillerengineering.com

Bob Ferapples

2008-03-23, 9:25 pm

On Sat, 08 Mar 2008 08:50:04 -0800, Protagonist <szaki10@comcast.net>
wrote:

>We have this old (60's?) Doerr AC motor 115V, (Model 60455/E 801)
>1/3 HP, single phase and we would like to buy a controller for it.
>But the seller wants to know, if it's split capacitor or split phase AC
>motor.
>I can't find any information on this AC motor and the company Doerr is
>out of business a long time.
>Any help, I would appreciate it.
>JS

Doerr is the "dor" in Baldor (Ballman and Doerr started the company
and combined their names to Bal-Dor). Doeer spit off and started his
own company making appliance motors, and was bought up by Grainger in
1969 who then started marketing them as "Dayton" motors. Grainger may
still have records of Doerr motors.

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