chuckey
Advanced Member level 6
dineshdeshmuk , see post #06
munzir, see motor manufacturer. In general (99.9 % of the time) 3 phase motors do not require a current limiting resistor. if the load on the motor is very heavy at start up, some times the motor is switched from delta running to star connected coils for starting, so the applied voltage is put across two coils, when the motor reaches a set speed (or time) the coils are switched around so the full phase voltage is put across each coil. In extreme cases (conveyor belts , for instance) the motor is powered from a variable frequency drive so the "mains" voltage is ramped up over some long period - 30 seconds?
Frank
munzir, see motor manufacturer. In general (99.9 % of the time) 3 phase motors do not require a current limiting resistor. if the load on the motor is very heavy at start up, some times the motor is switched from delta running to star connected coils for starting, so the applied voltage is put across two coils, when the motor reaches a set speed (or time) the coils are switched around so the full phase voltage is put across each coil. In extreme cases (conveyor belts , for instance) the motor is powered from a variable frequency drive so the "mains" voltage is ramped up over some long period - 30 seconds?
Frank
