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what is the advantage of DC Motor over AC motor & Where its
applicable ?
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Answer Posted / phanendra babu
it is completely depends on the application i.e where we are
using the motor.if we require high starting torque dc series
motor is applicable or we require better speed vs current
chars. dc shunt motor is suitable,like wise depending upon
the application it will change. and the main advantage of dc
motor over ac is speed controlling ig very very easy
compared to ac motors.
| Is This Answer Correct ? | 6 Yes | 3 No |
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We have drive feeding an output contactor for a 5000 hp motor @ 5kV application. The motor FLA is 629amps x 1.25% service factor = 786.25 amps The cable that we current have in place between the drive and the output contactor is 350kcmil- MV-105 (parallel cables). Per the NEC table 310.60 (C) (69). This show the cable ampacity is at 615 amps per cable for a rating of 1230 amps. We have derated the cable for the cable tray and the multiple cables application and our calculations show that after the correction factor factor we are at 922amps. 1230 amps x .75% correction factor factor = 922.5 amps. The customer is driving us to then use another safety factor of .25% off of the already derated cable. Can you please provide a longhand calculation for your solution on this application?
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