Author Topic: The continuing saga of the 7.5hp motor conversion  (Read 802 times)

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windmillbill

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The continuing saga of the 7.5hp motor conversion
« on: May 27, 2007, 02:26:33 PM »
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:



  1. -2   = 2.0         ALL COMBINATIONS ARE 0.6 OR BELOW
  2. -3   = 2.0
  3. -4&7 = 0.7         WIRED 1-DELTA:
  4. -5&8 = 1.4         ALL ARE 0.7 OR BELOW
  5. -6&9 = 1.4
  6. -10,11,12 = 1.0    WIRED 2-DELTA:


                    ALL CONNECTIONS ARE 0.0


  1. -4&7 = 1.3
  2. -5&8 = 0.4         I have all the number, but my fingers are tired and reading
  3. -6&9 = 1.3         them may get boring.
  4. -10,11,12 = 1.0
  5. -4&7 = 1.3
  6. -5&8 = 1.3
  7. -6&9 = 0.5
  8. -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.

« Last Edit: May 27, 2007, 02:26:33 PM by (unknown) »