|Jul 11, 2013, 03:03 PM|
Wind calculator for a 4020
Hi guys, Is there a specific calculator I would use for a HK4020?
I have a nib 12n8p 4020 to be redone @ 1000Kv. on the Scorpion site the
HKIII 4020 is 1100Kv using 3T/4T Delta. The motor being redone is a
HK 4020 is 910Kv using 10 Turn Delta.
The build requires as much torque I can squeeze out of this little beast for speed runs F3S style, high pitch low rpm. Am I too far off thinking of doing an ABCABC/ABCABC 5+5 1.5MM YY
also what does Scorpion mean by 3T/4T Delta? delta termination I understand but the 3t/4t ?
|Jul 16, 2013, 05:45 PM|
HK 4020-910 is using a 12N8P config
10 turns Delta means 10 turns-passages/slot ABC windings style
HKIII 4020-1100 is using a 12N10P config
3/4 turns Delta means 7 passages/slot dLRK windings style (asymmetric)
If you have a 12N8P kit use a) as the reference for Kv
On my sample S 4020-910 I measured 908 rpm/V
Of course Kv is inversely proportional to passages per slot
|Jul 17, 2013, 11:30 AM|
|Jul 19, 2013, 04:22 AM|
Given any configuration and geometric data (slots, magnets ..)
The rules are always
** Turns number is governing the Kv : Kv2 = Kv1 x N1 / N2
** Delta / Wye is providing a 1.74 ratio
** Serial / Half-Parallel / x Parallel is changing the Kv (serial = lower Kv ; // = higher Kv)
** Kv rpm/V x Torque/A is a constant (depending of units)
If you change the config and/or the geometry you change the Kv coefficient
example : more stator-mag height = lower Kv (for the same turns)
Also the volume (or coverage) of magnets is changing the coeff.
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