Hi,
Sorry for repeating me: You can´t expect a motor operates the same as an inductance. It has been discussed already.
Added:
Maybe this helps you to understand:
A motor is made to transform electrical energy --> to magnetic energy --> rotating mechanical energy. It is made to consume electrical energy that is never given back to the electrical circuit.
In oppsite your "storage inductance". It is made to store electrical energy and give it back to the circuit - as much as possible.
Klaus
First of all, your hand drawing is wrong.
You have drawn this:
View attachment 145983
I guess you want this:
View attachment 145984
That being said, check your circuit again.
Not sure what your problem is, I guess you didn't yet analyze the bridge driver behavior completely.
that the AIR CORE COIL acts exactly the same whether it is in a motor, or in a boost configuration...
What (else) can I do, that you stop to electrically compare a pure inductance with a motor? Please accept that it behaves differently.
If you don't believe ... I recommend to use a scope to show U and I and the timing ... compare the measurement results with your calculations.
Maybe a good test could be
* measure the inductance of a motor
* find an inductor with compareable inductance
* do measurements with a rotating motor
* do the same tests with the inductor
No, I'm not angry and I never was. I'm just clueless how to explain it the correct way.My dear Klaus, first of all, you know that I value your opinion, and I don't want to antagonize anyone, if my post is doing so, then I would kindly request you to delete it, I don't mind.
That's good.That is a brilliant experiment that would eradicate any doubts, therefore I performed it before I started.
I'm just clueless how to explain it the correct way.
Did you see any difference?
Nope. The experiment was simplified and conducted in a way so that the same physical coil was used i.e: Disconnect BLDC completely, connect one of the phases (i.e. 'coil' - whilst still situated in the BLDC enclosure) to your boost circuit, tune it to 110KHz and 30% duty cycle, and take note of input power (P=U*I) and output power, then you get ~97% efficiency. Then spin the rotor at the shaft and take note of input power and output power again, then compare with the first results and note the difference.
Just giving 30% duty cycle to one phase ... will not show the same results as when you give a "rotating magnet field" to all three phases.
In the usual delta wiring, it's not possible to energize only one coil at a time. But I don't see how this makes a difference.
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