SPWM for NPC inverter

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hi,
i'm noob @ this, having serious trouble understanding pwm. require spwm switching o/p uno drive inverter(npc 1 stage) motor.

motor specs 50hz(max), 220v, 6a, induction.

this academic project nearing end , i'm stuck more can handle. highly appreciated.
switching states follows. have made ckt on discrete components need use through uc.


t1      1    0    0
t2     1     1    0
t3     0    1     1
t4     0   0    1

can explain have , want.
for example, is: "o/p", "npc 1 stage", "ckt" ?
the term "spwm" can "sine-triangle pulse width modulation" or "synchronized pulse-width modulation".
can add links or photos ?
what t1, t2, t3, , t4 ? phases ?
what kind of driver hardware motor have ?


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