| 摘要 |
PURPOSE:To obtain a winding whose balance in a 3-phase AC machine having 4n+ 2 poles is excellent, by dividing the coil enclosed in each slot into 4 groups by voltage vectors, and constituting the coil groups so that the difference between the summed-up voltage vectors of individual groups becomes minimum. CONSTITUTION:Voltage vectors are expressed by A1-A6. Said voltage vectors are generated in one piece of the half-turn coils per one phase of the full-pitch-wound armature winding of a 3-phase AC machine having 4n+2 poles. For example, the number of the poles is 14, the number of the slots is 252, the number of slots per one pole per one phase is 6, and a short-pitch factor is 100%. In this case, the phase difference between individual vectors in the half-turn type coil is pi/18 and the electric angle thereof is the same. The number of the pieces of said coils is (2X252)/ (3X 6)=28, and the absolute value of each vector becomes 28 times. In order to obtain completely balanced 4 parallel circuits, 7 pieces (28/4=7) are selected in selecting 1/4 of the pieces of the half-turn type coil belonging to the vectors, and the connection is made in series so that the difference between the summed-up voltage vectors of individual groups becomes zero. |
