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Definitely fun stuff! ;--)

Hey, Thanks for a great video. I am just getting into working with inverters and have a fairly good understanding of their basic/idealized operation, but I am struggling to wrap my head around the harmonics of the base and switching frequency and how power is distributed among these. Do you know of any good resources to learn more about this? Thanks again for the video.

Perhaps you can quantify through demonstration of your product and show us results?

Nice

No sound

Great video. I'm trying to figure something out. My motor occasionally puts out and extra loud whine noise when accelerating, similar to that of brake regen noise, similar to normal car going in reverse. It's clearly an out of ordinary noise and only happens sometimes. Is this likely to be a power supply problem from the inverter or is it likely to be the motor? It's a lexus gs450h. Really sounds like noise is from motor, but from my current understanding of electronics, I'm wondering if it's the supply of power. Any thoughts please?

Great. Question; Is the 3rd harmonic present with a 3ph VVVF drive and 3ph motor, with the motor drawing balanced RMS current?

Amazing content! It was really educative experiment. Do you have any indication of what would be the minimum frequency given the fundamental and switching frequency? Like in the example you had a 24 Hz fundamental and a 8 kHz switching frequency, and that lots of clients work with 500 kHz sampling. What are the limitations? how low in frequency could you get ?

The number one reason why they matter is stability upon all flight envelopes. 2nd to that is being very 🤫 🤫 🤫 🤫 quiet and third is an incredible "sortie" rate or ability to fly near continuously provided the weather holds up. For now and I think for the sake of simplicity they are battery powered but this could change quite quickly given enormous advancements in hybrid drive systems for US consumer automotive products which are now quite suddenly in a massive glut. Should this technology migrate into Aviation and watercraft design the impact upon flight inside North America and the Caribbean would be immense and immediate.

I think add transmission to electric motor can save power and enhance the performance.

what is the fundamental frequency @23.29 ? How is it calculated ?

Great! ^^👍

I've been trying to contact you to measure the efficency of my eletric motors.

Sorry to hear the links are dead! We are going through a website transition and need to do some updates! Please find the link below! www.hbkworld.com/en/solutions/applications/electric-power/electrical-devices-testing/electrical-machine-testing

brochure and webinar links are dead. : (

:p

Actual theme. Thnx!

What shape is the magnet?

I have a 7000 hp synchronous motor that I'm struggling to get to sync. I'm told the module is looking for a reduced "ripple" before it allows the DC fiekd to energize and sync the motor. I'm just unsure how this module actually receives the ripple. The only wires that I'm aware of, connected to the motor, are the DC on the Exciter and the motor feed power. How would a module on a sync motor know what the ripple is? Via the DC wires through a sort of generation until the exciter energize?

Fortier Decomp?:)

what is the book ?

In your list of compelling applications of electric motors you forgot to mention drag racing. ;-)

To be fair train motors create nice sounds . I guess train motors are designed to have controlled frequencies that sound pleasent as opposed to annoying.

Good and useful Sir

A superb explanation ! ... but ... when does the COST " crossover " between some ( VERY cheap ) modern petrol engines and a MUCH , MUCH more expensive electric transmission , become financially efficient .. ( ? ) ... DAVE™🛑

You mentioned your preference is a dual flex coupling. Is this a torsionally rigid dual disc coupling (provides bending and axial offset) or one with dual elastomeric elements?

Would like to see this more clearly, very blurry

Will third harmonic be cancelled out if source voltage is line to line?

Is it possible to calculate all parameters using motor data sheets only?

Sir you have vacancy I am hvac air conditioner duct fitter 15 years experience Gulf country in Kuwait

Great explanation

Fibre optic signal transfer - cool 😎

radial motor have been wasting 50% of it efficiency for so many year, I new it for So many year and i have build axial flux motor then before I hard about axial flux motor and I never new it will be call axial flux motor

Im actually pretty fond of motor sound when kept to a controlled level . That low to high pitch moise the motor makes is pretty nice

Just found your channel and it is great

Love your shirt.

Hi Mitchell, Great presentation! I have a question regarding the WLTC cycles. If one WLTC cycle only takes 1800 seconds, could you please let me know how many cycles we need to run to assess the inverter's overall durability? Additionally, I'm curious if your team also conducts accelerated lifetime tests on the inverter. Looking forward to your response!

Lilium is the clear leader of eVTOL. Already building a pad at Palm Beaxh Airport, Munich Germany and not only are they the only jet, they got 6 orders paid for, 100 preorders from china and an armada of MOUs from a slew of the top aerospace companies. They're even ready to pursue their final certification steps with manned flights next.

But which method is correct in case of limit assessment? Let's say my signal can be decomposed to the spectrum with some spikes around 85 or 120 Hz (50Hz grid), but not 100 Hz (2nd harmonic). The standard for limits (like 61000-3-2 or 61000-3-12) says just "harmonics", it doesn't mention the "flavour" of my harmonics. Depending on criterion used i could fit well below the limits or exceed the limit way too high. Is it just the multiple of grid frequency important or every frequency bit is important and i just should look at these limits as band-energy limits

Where did we can acess the speed torque characteristic for ICE?

"only so many ways to fool mother nature" Exactly!! That line was also comes to my mind years ago once i realize all these methodology of concepts works it's actually just how we can manipulate and "tricked" the nature Lol

Thanks, Mitch! Very cool.

I think the figure at 2:05 is wrong. If you only have one cycle, as long as you have enough sample points within that one cycle. You will have just one sharp peak at the sin wave frequency. However, on the top left waveform, the waveform has 3.75 cycles. If you do a FFT without windowing. You will see spectral leakage instead of a single freq.

Amazing! What kind of pen ar used to the explanation?

.... Andre goes to the hardware shop to buy some stuff

Nice one

That expression just MMD! :-D

Im glad to see you enjoying the experiments , you shot it 3 times for the hell of it XDXD . Good video keep them coming ,!!!!!

That so cool

Thanks for this useful overview. I have a couple of comments that I hope will be useful. First, you're actually referring to flux linkage (in volt-seconds) and not flux (which is in Webers) - although flux linkage is in any case the more useful term when considering the electrical characteristics of a motor. Second, it's often useful to know the component of flux linkage from just the rotor magnet on its own (in the case of a permanent magnet motor) and this is easily done by doing an open-circuit test where the motor is spun by another motor. This forces the Id and Iq terms to zero and therefore eliminates the resistance terms from the equations. Under these conditions, all of the voltage should appear in the q-axis, since there will only be flux (linkage) in the d-axis.