Yaskawa SERVO MOTOR 12 month warranty SGM-02AWSU13 3000r/min Industrial Servo Motor

This study designs the motor such that the motor structure is periodic, since every two stator slots become one set. Figure 12 depicts such a set of stator slots that is marked by AA0 curve, starting from A to A0 . Figure 13 compares computational results of magnetic flux in the motor between two positions of movable stators by using the finite element method, where current in and out of phases U, V , and W windings are also marked. There are nine stator slots, and each stator slot has a movable stator between two fixed stator teeth. Each phase on generates 5A current input in stator slots.

Figures 13(a) and 13(c) show that flux line distributions vary with movable stator positions in slots. Figures 13(b) and 13(d) compare their flux density distributions. Note that flux lines pass through movable stators at any movable stator position. Hence, the flux density distribution and flux lines vary with movable stator positions, thereby varying the motor torque based on movable stator positions. Figure 16 compares flux density distribution vs. θm between computational results by executing ANSYS Maxwell and analytical results by calculating (19). The flux density depicted in Figure 16 exhibits three peaks from 0 to 25 deg in both numerical and analytical results. The horizontal coordinates of three peaks respectively correspond to mechanical angles θm of a fixed stator teeth, a movable stator, and a fixed stator teeth. The first peak in Figure 16 results from a smaller air gap between the fixed stator and permanent magnet, according to Figure 10. Similarly, the second peak in Figure 16 results from another smaller air gap between the movable stator and permanent magnet. Figure 16 depicts that numerical and analytical results are consistent. Thus, the present analytical model indeed can be used to predict magnetomotive force generated from PM. Table 1 lists the motor dimensions and specifications in this study.