I have finished converting a 7.5hp Baldor 208-230/460vac, 23-22/11 amps, 3phase, 213T frame, 1725 rpm motor. I have located the delta connection inside, attached leads to them and re-laced the coils. The rotor has been cut down to accept 16 skewed magnets, 1.5 X 1.25 X .250. 4 poles, 4 magnets to each pole. It all goes around and around like it's supposed to. Now for the numbers. The motor plate has the low voltage wired as: 6-5-4 (line is)9-3, 8-2, 7-1. High voltage is: 6-9, 5-8, 4-7 (line is) 3-2-1. Now it also has #10-11&12 leads.
@ 360 RPM the results are as follows:
RPM LOAD CONFIG VAC
360 NO 1 STAR 112
" 20 ohm 1 STAR 93
" NO 2 STAR 55
" 20 ohm 2 STAR 52
" NO 1 DELTA 63
" 20 ohm 1 DELTA 58.5
" NO 2 DELTA 31
" 20 ohm 2 DELTA 30
OHM'S READINGS ACROSS LEADS:
WIRED 1-Y: WIRED 2-Y:
- -2 = 2.0 ALL COMBINATIONS ARE 0.6 OR BELOW
- -3 = 2.0
- -4&7 = 0.7 WIRED 1-DELTA:
- -5&8 = 1.4 ALL ARE 0.7 OR BELOW
- -6&9 = 1.4
- -10,11,12 = 1.0 WIRED 2-DELTA:
ALL CONNECTIONS ARE 0.0
- -4&7 = 1.3
- -5&8 = 0.4 I have all the number, but my fingers are tired and reading
- -6&9 = 1.3 them may get boring.
- -10,11,12 = 1.0
- -4&7 = 1.3
- -5&8 = 1.3
- -6&9 = 0.5
- -10,11,12 = 1.0
Now I wonder what voltage my battery bank should be? At this point in time, I'm working on a 12v system, just because it's the easiest to start with. But now that I have these numbers, I think I need to go to 24 or 48 volt set up.
1-Y needs the largest amount of torque to turn - exactly how much is unknown.