Abstarct: In this thesis, proper design of a dual rotor axial flux induction motor is studied. First an algorithm is presented for design of this motor by using of sizing equations and electrical equivalent circuit model, then its two and three dimensional finite element models are developed. The models results show the validity and good precision of design algorithm. Also the ability and precision of two dimensional finite elements model is evaluated by comparing with three dimensional model, whereas its advantages in computation costs. Rotor slot skewing is a usual technique in induction motors for reduction of slot effects, especially torque ripple. In other hand dual rotor structure gives designer, more choices for slot skewing design. The effects of same directed and different directed skew and also effects of different skew angles in two rotors, on motor performance, especially torque and losses are assessed. In general there are some drawbacks in skewing the slots; as well as additional core saturation and inter-bar current loss increment. In the case of axial flux motors it will cause manufacturing difficulties too. Rotors relative shifting, which proposed in this thesis reduces the torque ripple by acceptable value and improves some other motor Characteristics, without need to skewing. This technique is applicable in small and large motors easily. While skewing is difficult in large size motors, and so is unusual. After introducing this method, the algorithm for calculating the shifting value is presented and verified by finite elements model.