Jon Slaughter said:
What I mean by two phase is 90 degree's apart(probably should have said
that). Also, it does not have to be exact but just approximate(it can
depend on the load but not to a great extentent).
The following circuit will generate 3 phase 144 VAC at 915 Watts output,
from 122 VAC single phase, at 946 watts input. This is for nearly ideal
components, and a balanced load. R4 in the circuit must be adjusted to the
load (R1-R2-R3).
The voltage across R4 will always be 90 degrees to the input voltage, but
will vary according to load. If R1-R2-R3 are changed to 1k each, the output
voltage across R4 will reach 1.7 kV, and the input current will be 48 amps.
Obviously this will only occur if adequately rated components are used, but
the phase angle is still 90 degrees to the input. You can adjust the
resistances to get various outputs.
I have built a circuit similar to this and it will run a 208/240 VAC three
phase motor. I used three powerstats and two 120/240 autotransformers.
It is critical to adjust the inductance and capacitance so they have equal
reactance at 60 Hz. They form a resonant circuit which must be damped by
the resistance; otherwise the input current will increase along with the
output voltage to dangerous levels. I was surprised a couple of times when
I noticed rather juicy arcs before the input circuit breaker tripped.
HTH,
Paul
==========================================================
Version 4
SHEET 1 880 680
WIRE 112 128 -144 128
WIRE 416 128 112 128
WIRE 608 128 416 128
WIRE 112 160 112 128
WIRE 416 160 416 128
WIRE -144 208 -144 128
WIRE 608 208 608 128
WIRE 112 256 112 240
WIRE 112 256 48 256
WIRE 416 256 416 224
WIRE 496 256 416 256
WIRE 112 288 112 256
WIRE 224 288 112 288
WIRE 416 288 416 256
WIRE 416 288 304 288
WIRE 608 336 608 288
WIRE 608 336 272 336
WIRE -144 368 -144 288
WIRE 0 368 -144 368
WIRE 272 368 272 336
WIRE 272 368 0 368
WIRE 112 416 112 288
WIRE 160 416 112 416
WIRE 272 416 272 368
WIRE 272 416 240 416
WIRE 304 416 272 416
WIRE 416 416 416 288
WIRE 416 416 384 416
WIRE 608 416 608 336
WIRE 0 432 0 368
WIRE 112 480 112 416
WIRE 224 480 112 480
WIRE 416 480 416 416
WIRE 416 480 304 480
WIRE 112 560 112 480
WIRE 144 560 112 560
WIRE 256 560 224 560
WIRE 304 560 256 560
WIRE 416 560 416 480
WIRE 416 560 384 560
WIRE 256 608 256 560
WIRE 496 608 256 608
WIRE 608 608 608 496
WIRE 608 608 496 608
FLAG 0 432 0
FLAG 48 256 PH-A
FLAG 496 256 PH-C
FLAG 496 608 PH-B
SYMBOL voltage -144 192 R0
WINDOW 3 -121 130 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 -121 158 Left 0
SYMATTR InstName V1
SYMATTR Value SINE(0 180 60 0 0 0 60)
SYMATTR SpiceLine Rser=.1
SYMBOL ind 96 144 R0
SYMATTR InstName L3
SYMATTR Value 100m
SYMBOL cap 400 160 R0
SYMATTR InstName C1
SYMATTR Value 73µ
SYMBOL res 128 576 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R1
SYMATTR Value 68
SYMBOL res 400 544 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R2
SYMATTR Value 68
SYMBOL res 320 464 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R3
SYMATTR Value 68
SYMBOL ind2 256 400 R90
WINDOW 0 5 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName L4
SYMATTR Value 2
SYMATTR Type ind
SYMBOL ind2 400 400 R90
WINDOW 0 5 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName L5
SYMATTR Value 2
SYMATTR Type ind
SYMBOL ind2 592 192 R0
SYMATTR InstName L1
SYMATTR Value 2
SYMATTR Type ind
SYMBOL ind2 592 400 R0
SYMATTR InstName L2
SYMATTR Value 2
SYMATTR Type ind
SYMBOL res 320 272 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R4
SYMATTR Value 3k
TEXT -160 392 Left 0 !.tran 500m startup
TEXT -160 448 Left 0 !K2 L4 L5 1
TEXT 464 368 Left 0 !K1 L1 L2 1