Picture of Four-Pole Three-Phase Stator The winding connection for the four-pole stator is shown in Fig. 7. It consists of two windings per phase, connected in series with the primed end of one winding connected to the star point and the non-primed end of the other winding made available for input power. The series connection of winding a 1 a 1 ' and a 2 a 2 ' constitute phase winding a, and the same applies for the other two phases. 

Contexts in source publication

Context 1

... development of a three-phase, four-pole stator of an ac machine is accomplished utilizing the two-pole, three-phase stator of Fig. 1. The two-pole stator is cut along the line through which the positive bb' magnetic axis of phase winding bb' passes, producing two points X and Y on either side of the line. This cuts the positive bb' magnetic axis into two. If the point on the stator marked X is now pulled in a clockwise direction through 90 mechanical degrees, then, the stator along with its magnetic axes would also be pulled with it, thereby collapsing them to the positions shown in Fig. 2. The same process is performed on the point marked Y, but this point is pulled in an anti- clockwise direction through 90 mechanical degrees. The result of these actions is to collapse the magnetic axes and the stator which previously occupied 360 mechanical degrees, into a space of 180 mechanical degrees as shown in Fig. 2. The new positive magnetic axes of phase windings aa', bb' and cc' are now displaced from each other by 60 mechanical degrees. A picture of a four-pole, three-phase stator, showing the six phase windings is presented in Fig. 6. This layout of the phase windings in this picture coincides with the placement of the windings in Fig. 5, thereby confirming the validity of the technique used to develop the four-pole, three- phase stator. ...

Context 2

... development of a three-phase, four-pole stator of an ac machine is accomplished utilizing the two-pole, three-phase stator of Fig. 1. The two-pole stator is cut along the line through which the positive bb' magnetic axis of phase winding bb' passes, producing two points X and Y on either side of the line. This cuts the positive bb' magnetic axis into two. If the point on the stator marked X is now pulled in a clockwise direction through 90 mechanical degrees, then, the stator along with its magnetic axes would also be pulled with it, thereby collapsing them to the positions shown in Fig. 2. The same process is performed on the point marked Y, but this point is pulled in an anti- clockwise direction through 90 mechanical degrees. The result of these actions is to collapse the magnetic axes and the stator which previously occupied 360 mechanical degrees, into a space of 180 mechanical degrees as shown in Fig. 2. The new positive magnetic axes of phase windings aa', bb' and cc' are now displaced from each other by 60 mechanical degrees. A picture of a four-pole, three-phase stator, showing the six phase windings is presented in Fig. 6. This layout of the phase windings in this picture coincides with the placement of the windings in Fig. 5, thereby confirming the validity of the technique used to develop the four-pole, three- phase stator. ...