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Hello sir , I love to your study for motor but, want to study please

I hArdly hearing u

Extremely educational. This video has taught a lot of Q&A thank you for your time. 1 question why my motor have three capacitors ( one for run and 2 for starting in series)

Very Good Video and informative. You also need to know the type of capacitor you are implementing is a running capacitor. There are starting capacitors that are invoked during the startup of the motor and disengaged when the motor has reach its rotation RPM. You want to use the correct type of capacitor for PF correction. I run into problems where you dont have the specs on the equipment that is old and plate is missing on the motor or you bought the machine from harbor freight and specs are not available. The question is can you get the number from taking various readings from the motor and calculating a new PF?

Informative as i have to do a transformer test for an assesment quite similar to a motor test only difference is the winding config of a transformer is primary delta and secondary star

Genius. Thanks for the work. You explaiend everything very clear . Thanks a lot

I calculated the value of capacitor for pf correction as 40 mfd. I connected after step by step calculation as demonstrated in this video. Before correction the current taken was 3.1 Amps. After pf correction, the current taken was only 1.5 Amps. Excellent video.

Time delay ON relay has NO contacts and time delay OFF relay has NC contacts on the light bulbs in your demonstration?

For us laymen, it would be great to understand why this works. For instance, is the electrical power supplied to the machine a smoother sine wave, or . . . ? Thanks for the demonstration, it was very eye opening for me.

Excellent demonstration. Today I calculated a capacitor value for my centrifugal pump and came out to be 40 mfd for Half Hp. Today I am going try that. Very happy to listen such practical sessions with theoretical derivations.

Don't you think it would have impacted torque.As torque is dependent on current.

Hi Serge, ur doing good videos. @ 7:23, the osci kinda show that the circuit is CAPACITIVE as the CURRENT is LEADING the voltage.. why the NEED to ADD CAPACITORS for correction? I think I am getting confused with the theories. Kindly share an explanation. I hope to hear from u soon. Thanks a lot.

I was impressed with your presentation. However, when I checked the motors on my old saws, none of them listed a PF or Efficiency. Subsequent searches on the internet led me down a rabbit hole which took me all night to climb out of. Is there a method available to obtain the capacitor sizing? My motors are 3/4 and 1Hp Marathon Electric 120/240.

Excellent presentation young man.

those were built to last forever

This is the best channel I find it. thank a lot for your demonstration you are a very good teacher. I must give you 👍to all your video. Best regards

thank a lot teacher

Not a calculator program to input the variables to give you the capacitor answer?

Really enjoyed your video but because we are billed by KW and not amps do we really save any money? After PF correction do we still use the same kW?

Hi there! Now when I re-watched this, I realized there is something I'm missing : shouldn't TIP be voltage times FLA ? The final current draw, post-correction, is compared to FLA, but FLA appears nowwhere in the initial input calculations.

Great video! A lot of good useful information you can apply.

Is this taught in school to students training to be electricians and HVAC technicians or is this only taught to students studying to get a bachelor's degree in electrical engineering?

Old fridge compressor need about 40uF parallel to bring amperage down to a PF=1.

Your video not for everyone sir. Keep make video. I want more knowledge.

Smart meters and analog meters charge extra for poor power factor, a parallel cap can save MONEY men. They are not true watt meters but just VA meters!

Professor you just calculate the loss of power, how can you at the end does not feel it, this could be perjuice of investigator?

This is a very nice explanation of the capacitor value calculation, but it is misleading with respect to savings. In the USA, utility companies only bill small consumers for actual power, not apparent power.. Small consumers save nothing by power factor compensation, but they can free up circuit capacity. Large consumers have a more complicated billing structure that may include some charge for low power factor. I suspect the same is true in Canada and in other parts of the world. There is no cost to utilities to produce reactive power, but it does reduce their capacity and and the transmission losses have a cost. Utilities may install power factor compensation in substations and even on poles to reduce the transmission and capacity losses.

You can't really determine the cap value from nameplate numbers. It is a function of motor loading. You put caps on & vary cap & note the current & go for minimum. You save nothing as far as utility is concerned. Home power is charged based on real power, not reactive power. The only "saving" is less current in your home's wiring. This would be useful only if heavy load is on the edge of tripping breaker. The cap you are using looks like "motor starting cap". These are AC nonpolarized caps designed for use a few seconds at a time only! You need AC oil caps if you plan on running the load for any significant period of time. They are large for the microfarads you get! You also need to deal with the surge on turn-on. This will tear up the appliance's on-off switch. A better thing to do with this motor (assuming it has either starting cap internally, in the bulge on the motor's top, or it is split-phase start, both with centrifugal switch cutout) is to put an AC cap on the "starting" winding permanently (smaller than the starting cap) sized to balance the 2 phases in the motor internally WHEN RUNNING. This will make the motor run cooler & consume less real power, & will reduce vibration.

This is the best PF i have ever seen. Thank you very much. Im working on a project and ive been looking for a video to properly explain this to me.

Would be nice to also clamp an ampmeter on the black capacitor wire to show the reactive current. And a killawatt device on the input to demonstrate an improved power factor.

I'm learning about PF correction online..you sir are the best teacher I have come across!!! That was excellent explanation of exactly how power factor works that it was so much easier to understand than my course I'm doing at the moment! Subbed and liked 👍 thank you so much and cheers from Australia 👍

Very nice explanation, thanks for give us your important time …

I think your Watt meter only recognizes active power not reactive power . Correct me if I’m wrong.

One of the best no nonsense education videos I’ve seen!

very good info for off grid Battery, solar. every amp counts

Why didn't the manufacturer do it for the consumer by putting in the right capacitor ?

Great explanation! How would one go about calculating a power factor adjustment on a variable speed pump for example.

What brands and types of capacitor should I use on an old 1940s transformer welder? There is no markings on the capacitor. The equipment plate has these specs, Primary volts, 230v 60hz, max 37 amps, output 180amps max at 25v, OCV 52v-65v, F.L.P.F. 75%.

Hello from Jamaica. Do you teach classes on this?

My foreman just dropped a transformer on its side today. I’ll look like a hero when I test it tomorrow haha thank you.

Thank you so much! I went along with your lesson and built a spreadsheet to do the calculations at the same time. I have a much better understanding and greatly appreciate the time you put into the video! Well done!

I’m an apprentice lineman and we’re going over magnetism currently. This helped me so much. Thank you sir!

I’m an apprentice lineman and we’re going over magnetism currently. This helped me so much. Thank you sir!

Thank you! Great instruction!

As asked by Muhammad 1year ago. Why are motors produced with this inefficiency in them? Are the motors with two capacitors on them corrected already. Im nowhere near a electrician just always trying to learn a bit of something. Thanks for the lesson.

What I wonder is if the harmonic distortion (I) has any consequence in maintaining the magnetic field in the motor coils. I want to think it's meaningless compared to correcting PF.

Thank you for this! (I'll be back soon for 3Ph classes 🙂) Meanwhile, I have a diaphragm (inductive load) pond air-pump that at 120.8v meters at 78w (claimed) and 1.58a (claimed), but it didn't make sense to me. I have some homework to do and a plan. And now I can imagine how makers size run caps for CSCR vs CSIR motors. That said, It seems that any CSIR ought to be checked out.

Excellent video first and foremost! Incredibly helpful and easy to follow along! Quick question for you though. After solving for the proper capacitor for the PF correction, you came up with the 82.xx mfd capacitor. I noticed that the capacitor you selected from the HVAC distributor was a plastic body capacitor. Normally in my trade (HVACR) the plastic body capacitors are used in the starting circuit applications and the metal body capacitors are used in the run circuit applications. I'm curious and would like to know if it would make a difference (if any at all) if A: there was a specific reason as to why you used a start capacitor style or B: could you use a run capacitor in lieu of a start capacitor so long as the mfd and voltage rating were matching?

You really haven’t done anything, you should have checked the amps with the bell on and put the machine under load. You could’ve lost those amps just by taking the belt off and reducing the drag. Sounds like bullshit to me

thank you sir... wondering why the power factor capasitor does not come with the motor when you purchase the equipment.