Context: Doubly fed electric motors have two independent multiphase winding sets, which contribute active (i.e., working) power to the energy conversion process, with at least one of the winding sets electronically controlled for variable speed operation. Two independent multiphase winding sets (i.e., dual armature) are the maximum provided in a single package without topology duplication. Doubly-fed electric motors are machines with an effective constant torque speed range that is twice synchronous speed for a given frequency of excitation. This is twice the constant torque speed range as singly-fed electric machines, which have only one active winding set.

Question: What type of motor has two independent multiphase winding sets?
Answer: Doubly fed electric motors

Question: What advanage do independent multiphase winding sets have?
Answer: contribute active (i.e., working) power to the energy conversion process

Question: What is one of the independent multiphase winding sets configured for?
Answer: variable speed operation

Question: Doubly fed motors have what advantage over single fed?
Answer: twice the constant torque speed range

Question:  What type of motor has three independent multiphase winding sets?
Answer: Unanswerable

Question:  What advantage don't independent multiphase winding sets have?
Answer: Unanswerable

Question: What is one of the dependent multiphase winding sets configured for?
Answer: Unanswerable

Question:  Doubly fed motors have what disadvantage under single fed?
Answer: Unanswerable