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nowdays most of factories bagan to replace dc motor with ac that's why ac is simple on it's maintenance and easy to control
Motor with AC converter is better. It is slightly expensive but you can control your device efficiently.
Three- phase induction motor with a variable frequency drive(VFD) is the best solution , as induction motors have lower maintenance and troubles than DC motors, and if you need a high starting torque you may use slip ring induction motor, You may send me your requirements and I will give you the technical specs.
it is better to use AC motor with VFD (variable frequency Drive) or VSD (variable speed drive) to control speed of motor. VFD and VSD also offer automatic speed control according to requirment with discrete signal and fast communication methods for remote controlling.
ac is better the dc dc has a lot of problems most factory use ac motor
the quistion is not clear but for controling by Ac motor with ac converter that is mean using motor drive inverter AC - Dc- AC to controling by motor speed if we use Ac power source and if we use Dc power source we can use Dc - Ac inverter to controling by motor speed also for prushless Dc motor we can use Ac-Dc inverter this motor small
and if we want to use Dc motor direct we need Dc power source also we need adjust button to up/down the power to control by it's speed and this very bad and it will distroy the motor
Use AC motors with Frequency controllers
AC motors is better than DC motor
ِAC motor is better NOTE that the induction type is the best one in AC types Because its simple construction and maintenance and easy to control by variable frequencies concept
In general, AC motor is better taking into account maintenance figures. Note that DC motor is more precise when speed control, but the high modern VFD technologies can achieve the same level for AC motors.
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