Induction motors and capacitors lowers amps "consumption"

[Kyoat]

First off I'd like to thank Hoptoad for bringing an interesting question to the table.  A question about watts and the AC power factor.
One of our members has a "kill a watt" meter, and so we (kinda) incorporated it into our load test. (still learning  )

[Kyoat]

I have a question for any of you out there with the knowledge of this website.

How do you, after posting an article, go back to make "corrections" or to delete errors?
I know that when you first post an article, that you are allowed to do this for "a short period of time" then this "edit" feature goes away.

If any one could help me with this I'd appreciate it.   Kyoat

[gyulasun]

Hi Kyoat,

As far as I know, presently 'the short period of time' may mean one hour from the time of posting.

Maybe Stefan or someone else 'in the know'  can correct this if it is otherwise .

When you could spare some time for coils resistance measurement,  please do so.

Thanks,  Gyula

[Kyoat]

Hi Kyoat,

As far as I know, presently 'the short period of time' may mean one hour from the time of posting.

Maybe Stefan or someone else 'in the know'  can correct this if it is otherwise .

When you could spare some time for coils resistance measurement,  please do so.

Thanks,  Gyula

Yea, We got busy with other "projects" and I forgot to do that.  My problem is that I live about 18 miles from our shop
where we do all our testing, building, etc.  Maybe I can see if my partner can get those figures so that I can post them.  Kyoat

[Kyoat]

I thought these results were both fascinating as well as what I would consider to be unexpected results.
The following test results were conducted on an Emerson 1hp, 1ph, 60hz motor.
We were tyring to find the "sweet spot" for capacitance across the primary coils for the lowest VAR watts "consumption"
We were using a KILL A WATT model P3 meter.

Capacitance:    Amps:        Apparent watts:        VAR watts:           Power Factor:         reduction %       

     NONE          9.63                203                      1146                      .18                     00.00

     200uf          2.05                196                       247                       .79                    78.44%
     205uf          2.02                197                       244                       .80                    78.70%
     206uf          2.02                196                       243                       .81                    78.79%
     207uf          2.01                196                       242                       .81                    78.88% <-- sweet spot
     207.5uf       2.02                 196                      243                       .80                    78.79%
     208uf          2.02                196                       242                       .81                    78.88%
     209uf          2.02                196                       244                       .80                    78.70%
     210uf          2.02                196                       246                       .80                    78.53%
     215uf          2.06                196                       249                       .79                    78.27%
     219uf          2.09                196                       253                       .77                    77.92%

Notice that even between the non-cap circuit motor verses the cap circuit's there is only a 7 watt spread when it comes to the "APPARENT WATT" reading.  It really doesn't matter how much capacitance you put into it, the apparent watts is always about the same.

Verses the difference between the non-cap circuit motor and the cap circuits for the "VAR-WATT" readings! A drastic drop in what you would be charged to run this motor by your AC (Always Crooked) supplier by just installing a little capacitance.   Kyoat