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Which type of drive is advantageous AC or DC and why?
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Answer Posted / princealekota
Ac drive will have the more advantages compared to DC in
variable speeds less losses, less maintenance, robust etc..
but one advantage of DC drive is controlling of DC drive is
very easy compared to AC drive because, by controlling the
current we can control the torque in DC drive
eg: if u draw the equivalent circuit of Dc machine
Va ( armature voltage) = IaRa + La*(di/dt) + weLafif
Vf= IfRf + Lff*d(iff)/dt
md ( torque) = (p/2)*LafIfIa
So simply by varying currents we can control the torque.
in AC torque depends on the shaft speed, freq, slip etc..
even though the controlling is easy in DC... AC drive are
good for general purpose and the rest depends on the
requirement
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