Why D.C drives are preferred in various industries even if the supply was A.C?

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Mainly bcoz of its simlicity in speed control
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industrial automation - PLC &scada ,motor,derive

It depends upon torque requirment where high torque application is needed DC drives is used
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ELECTRONICS ENGINEERING FACULTY with 14 years of experience in teaching

Coming in Contact with AC and hence working upon the devices using AC is comparitively risky and needs to be handled more carefully
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DC drives are easily speed controllable. We can obtain the speed whatever we want rapidly.
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B.Tech

In dc motor torque and flux components are orthogonal to each other inherently. So by independently controlling these parameters speed can be controlled. Where as in AC motor like Induction motor the flux and torque components are not orthogonal inherently. In AC motor these components are made orthogonal...
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In dc motor torque and flux components are orthogonal to each other inherently. So by independently controlling these parameters speed can be controlled. Where as in AC motor like Induction motor the flux and torque components are not orthogonal inherently. In AC motor these components are made orthogonal using reference frame theory which will be complex. read less
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Electronics engineer

DC drives are free from electromangnetic Induction and controlled electronically by the logic controllers which can be monitored remotely by software .DC drives are robust and less heat generators there by efficiency is more
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Electrical machines tutor

in DC drives that to shunt machinesre having constant speed characteristics that means almost their speed is independent of load
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