piyush_bhatt
Junior Member level 2
hello friends,
i am trying to build variable frequency based ac drives, and i got success at 50-60%. in no load condition the drive works fine and motor runs normally and i can vary speed too. but now my problem is when i attached 1A resistive load motor speed reduced to half level from its maximum. i don't know why this happen. i have design my ckt as follows.
single phase i/p - rectifier - pic controller(for generating pwm) - inverter - 3 phase ac motor.
my readings are....
single phase i/p dc volt o/p line-line volt-curent speed condition
270v(rms),1.5A 340vdc 200v(rms), 2.2A 1470rpm no load
270v(rms),4.5A 340vdc 216v(rms), 9.8A 660rpm load-1A_resistive
i guess anyone could help me to figure out this problem,
thanks
best regards
i am trying to build variable frequency based ac drives, and i got success at 50-60%. in no load condition the drive works fine and motor runs normally and i can vary speed too. but now my problem is when i attached 1A resistive load motor speed reduced to half level from its maximum. i don't know why this happen. i have design my ckt as follows.
single phase i/p - rectifier - pic controller(for generating pwm) - inverter - 3 phase ac motor.
my readings are....
single phase i/p dc volt o/p line-line volt-curent speed condition
270v(rms),1.5A 340vdc 200v(rms), 2.2A 1470rpm no load
270v(rms),4.5A 340vdc 216v(rms), 9.8A 660rpm load-1A_resistive
i guess anyone could help me to figure out this problem,
thanks
best regards