Re: Heat generation, No problem Miles...
12p3phPMDC wrote:But how does that affect circulating currents in delta driven trapezoidally,
In Hanselmann, it says that the circulating currents are caused by 3rd harmonic component in the bEMF. Or am I misunderstanding...?
Um...Yea, I read that as well.......But, I think you can get circulating currents in Delta from both the Drive and the BEMF.
Too bad the pdf jumps around...it would make a great reference! It was enough to tease me into plunking down the change
for his book.
In a delta config, If you excite it sinuisoidally, then you avoid adding additional "triplen" harmonics as Hanselman describes.
But if you excite it trapezoidally, then you are adding additional harmonics, including the triplens that don't cancel which cause more circulating currents.
Does that make sense, or am I off my rocker?
I dunno...more reading.
But, It sounds like even the experts disagree!
It probably means that it depends heavily on other parameters that I don't even begin to understand.
That's probably why David says "some motors just don't like Delta".
But, what is the difference in topology/windings/poles in a PMSM or PMAC (Permanent Magnet Synchronous) and a BLDC?
Does a PMSM/PMAC motor have distributed windings? Whereas a BLDC is typically concentrated? and is the Astro a blend that has no problem being
driven trapezoidally in Y??? and because it is driven in Y, all phase currents are forced to sum to zero by KCL?
I wonder what the BEMF waveform of the Astro looks like when spun up by a drill? Is it trapezoidal or is it sinusoidal?
"If you don't follow your dreams, you might as well be a vegetable." Burt Munro
The reasonable man adapts himself to the world;
the unreasonable one persists in trying to adapt the world to himself.
Therefore all progress depends on the unreasonable man.
-- George Bernard Shaw