How to Measure Horse Power for Any Electric Motor: (#077)

How to build and use a dynamometer for measuring Horse power in the home shop. Links to download models and parts list below.
How to measure the mechanical power of an electric motor.

If you want to chip in a few bucks to support these projects, please visit my Patreon page.





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Notes:

I did not add quite as much detail as I would with paid plans but hey... you are definitely getting your monies worth!

Link to download files.

Other references.

Matthias Wandel's Channel

Building my variable DC power supply

Amazon affiliate links


Technical corrections
1. I discuss changing the bearing to allow higher speeds of the test motor. However, the rotor of your braking motor is designed/balanced for a specific rpm. It might vibrate or even self destruct if spun at higher speeds. My motor has survived several test at 21k for an up coming video, but that certainly won't apply to all motors used for this.

[TrueHolarctic]

This chanel is like aplied science, but for motors

[matthiaswandel]

If you use that induction motor at high torque low RPMs for a long time, the rotor will overheat. Rotor induced power is a function of torque, but cooling is a function of RPM. It might be better to use an open framed motor for the brake, so that you can blow air through it. Also, a 1800 RPM motor may not be well enough balanced to run at 10, 000 rpm as a brake. You need to use a motor that is at least close to the rated torque and RPM of the driving motor for the braking motor.

[cafned]

If there is anyone else on Youtube presenting content like this in such an understandable way I certainly haven't found it. Thanks for all you do!

[AustrianAnarchy]

You have one of the most awesome names for an electric motor guy!

[jwhiteaol]

That was some nice motor label editing cuts.. the extra effort is not wasted on me cause I noticed.

[throngcleaver]

I ordered a dynamometer from eBay, but they sent me a dinomometer, which measures the strength of ancient reptiles. Great video, Jeremy!

[onenewworldmonkey]

I seriously use your channel all the time. You are the best at understanding and teaching everyday electronics. YOU DA MAN. Thanks for your help.

[calebbadger]

We have a commercial version of this at work. We build motor controllers and we will characterize the motors our customers use and build the controller to work with them. I was surprised at how intuitive these are and I'm impressed that you made one.

[gregglasgow]

Your knowledge amazes me. What a joy you are to watch and learn from. Thank you

[jlibb]

Jeremy, good to see you posting again.

[brettkarling]

I love how excited you get over the work you do, brings me joy watching you enjoy your work!

[MarkMcCluney]

Magnificent. The moment of delight when you suspected the clutch and wanted to investigate was so inspiring. Your attitude is what so many young folks have educated out of them when they study science and engineering at the most formal level. I think it's appropriate to say 'more power to you Jeremy!'

[samhziegler]

I love how often your channel comes up, as I puzzle my way through whichever problem is holding up a project at that moment. Cheers mate

[nzw]

Your channel is by far my favorite when it comes to salvaging parts that can be repurposed for all sorts of homemade projects. Keep up the great work, please.

[MT_T]

Your videos are truly fantastic, you are a natural presenter clear and concise.

And a brilliant roll model

[DracoOmnia]

Story of my life, "I did think about buying Z... But when I saw the price I immediately started thinking about a DIY option"

[TryinFlyII]

You Sir are a ABSOLUTE GENIUS!! In my eyes Thanks for sharing your knowledge!!!

[MR-ukiy]

If only I would have had you as a teacher, your videos are amazing man, both me and my brother are super entertained and educated by your stuff!

[ra]

I got to say that your videos are a real encouragment.Tbh I dont have an engineering mind I'm not good at these stuff but your videos are really helpful.Keep doing what your doing!!!

[joemwiti]

Great job, your videos are usually amazing. You take your time to explain in detail, keep up the great work mate.