3 Phase-controlled DC motor drives
3 Phase-controlled DC motor drives
3 Phase-controlled DC motor drives
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• Hence, varying the applied voltage changesspeed. Reversing the applied voltage changesthe direction of rotation of the <strong>motor</strong>.• The advantage: the field time constant is atleast 10 to 100 times greater than the armaturetime constant.• Armature control is idea for speeds lowerthan rated speed; field control is suitableabove for speeds greater than the rated speed.