@mbouwer
My apologies, first time I saw you using my images I thought there were alterations made to it. So I got nervous and asked for removal. Now I see there are no alterations but still I miss the relevance of a lift type turbine image in the context of a drag type context. One thing we are are is on the same page of having enough space.
@Adriaan,
Thank you brother for once again pitching in. But I lack the intellect to wade through your papers.
Would you be willing to digest for us a formula and present it here?
A problem with the formula is that it contains square root signs which I type as a Greek letter in my reports and that it contains indices which I can't make on this forum. So I give the formula here on this forum without square root signs and without indices. Formula 14 out of KD 340 for star rectification is then given by:
Udc eff = 0.955 * square root of 3 * square root of 2 * U eff minus 1.4 (V)
Udc eff is the effective DC voltage. U eff is the effective AC voltage in between the star point and one of the phases. The term 0.955 is to compensate for the small fluctuation of the DC voltage. The term 1.4 is the voltage drop over two silicon diodes of the 3-phase rectifier. So if Germanium diodes or Schotky diodes are used in the rectifier, the voltage drop can be smaller.
0.955 * square root of 3 * square root of 2 = 2.3393
If a complete 3-phase winding is laid and if you measure the AC voltage in between two of the three phases, this AC voltage is a factor square root of three higher than the voltage U eff in between the star point and one of the three phases. So if you use this voltage, the term "square root of three" is cancelled in the formula for star rectification.
If the winding is rectified in delta in stead of in star, the AC voltage is a factor square root of three lower and the AC current is a factor square root of three higher. So the formula of the DC voltage differs from the formula for star rectification such that the term "square root of three" is cancelled.