JP3129461B2 - Rotating electric machine with annular winding stator winding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine having an annular stator winding in which a stator winding is wound around a slot and a yoke portion of a stator core by an annular winding.

[0002]

2. Description of the Related Art This type of rotating electric machine is used for a small-capacity permanent magnet generator for supplying power to a brushless exciter. Conventionally, a stator winding of a permanent magnet generator for a brushless exciter has been wound around a slot of a stator core by random winding. An annular winding is a type of armature winding of a DC machine.It is a winding in which a coil is wound around the annular stator core from the inside of the stator core to the outer periphery in a spiral shape, and the inner coil side is the effective magnetic flux. Since it does not cut off, it does not contribute to the generation of electromotive force and causes a resistance drop. Furthermore, since the winding must be manually wound through the inside of the iron core, the winding operation is difficult and is not practical for DC machines.

[0003] Some synchronous generators are excited by a brushless exciter, and the brushless exciter is excited by a sub-exciter. A permanent magnet synchronous generator used as a field power supply source of the brushless exciter is arranged coaxially with the brushless exciter, and sometimes is attached to the main body of the synchronous generator together with the brushless exciter by overhanging. At this time, when the number of poles of the synchronous generator main body changes (when the number of rotations changes), the number of poles of the permanent magnet synchronous generator, the number of slots of the stator winding, and the winding pitch are changed to change the permanent magnet synchronous generator. The generator frequency was kept constant, and the AVR side did not require special components such as a printed board. Therefore, it is necessary to manufacture many types of permanent magnet generators according to the number of poles of the synchronous generator main body. Further, when the permanent magnet synchronous generator is mounted overhanging on the same axis as the synchronous generator main body, it is important to reduce the size and weight of the rotating part of the permanent magnet synchronous generator. In recent years, high-performance permanent magnets made of neodymium alloy have been developed,
The size and weight of the magnetic pole part that constitutes a part of the rotating part of the permanent magnet synchronous generator can be reduced, but the stator winding generates the same voltage as before, so the number of turns of the stator winding increases, The winding end of the is relatively long compared to the physique of the rotating electrical machine,
For this reason, the reduction in the size of the magnet prevents the permanent magnet synchronous generator from being reduced in weight as a whole.

FIG. 3 is a sectional view of a permanent magnet synchronous machine having a drum winding. In the figure, a stator comprising a stator core 6 which is a drum-shaped winding inserted into a stator core 1 and a rotor comprising a rotating shaft 12 to which a permanent magnet 3 is attached are provided.
Since the stator winding 6 is long, the entire permanent magnet synchronous machine is elongated in the axial direction.

[0005]

[0006]

SUMMARY OF THE INVENTION In a rotating electric machine having an annular stator winding for winding a coil around a yoke portion of a stator core, particularly in a permanent magnet synchronous generator, even when a high-performance permanent magnet is used. It is necessary to shorten the axial length of the stator winding end.

The present invention provides a rotating electric machine having an annularly wound stator winding that can reduce the axial length of the end of the stator winding even when a high-performance permanent magnet is used. With the goal.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a stator core formed by fastening a laminated iron core with a plurality of tightening bolts penetrating in an axial direction. The stator winding can be easily wound by the annular winding around the yoke of the stator core by extending one end of the Can support the stator core. At this time, the number of tightening bolts was changed to the number of pole pairs (1/3 of the number of magnetic poles of the rotor).
The same number as in 2), and by arranging the tightening bolts at equal intervals on the circumference of the yoke portion of the stator core, it is possible to prevent the circulating current from flowing through the tightening bolts without using an insulator for the support plate. can do.

[0009]

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a stator core according to an embodiment of the present invention. The stator core 1 is formed by tightening the laminated iron core with a plurality of tightening bolts 14 penetrating in the axial direction, and both ends of the tightening bolts 14 are extended and nuts 1 are attached to the support plate 15.
Then, the stator winding 6 is wound around the stator core 1 by an annular winding. This makes it possible to easily wind the stator winding 6 having an annular winding around the stator core 1.
Note that a rotor (not shown) is inserted into the inner diameter side of the stator core 1. Since the number of the tightening bolts 14 is the same as the number of pole pairs (１ ／ of the number of magnetic poles of the rotor) and the tightening bolts 14 are arranged at equal intervals on the circumference of the yoke of the stator core 1, Since the voltages induced in the tightening bolts 14 are in the same phase, the tightening bolts 14 have the same potential, so that no potential difference occurs and no circulating current flows through the tightening bolts without using an insulator on one support plate 15. .

FIG. 2 is a configuration diagram of a rotating electric machine according to another embodiment of the present invention. In the figure, the stator core 1 is formed by tightening the stacked cores with a plurality of tightening bolts 14 penetrating in the axial direction, and one end of the tightening bolts 14 is extended to support plates.
The stator core 1 is supported by fixing the nut 15 to the nut 15. A stator winding 6 is wound around the stator core 1 by an annular winding. In this way, the stator winding 6 can be easily wound around the stator core 1 by annular winding. The rotor was formed by attaching the permanent magnet 13 to the retaining ring 18, and the rotor was disposed on the outer diameter side of the stator core 1. Also in this embodiment, the number of the tightening bolts 14 is the same as the number of pole pairs (1/2 of the number of magnetic poles of the rotor), and the tightening bolts 14 are equally spaced around the yoke of the stator core 1. Because of the arrangement, the voltages induced in the respective tightening bolts 14 have the same phase, so that the respective tightening bolts 14 have the same potential.There is no potential difference and the tightening bolts 14 do not need to be provided with an insulator on one support plate 16. No circulating current flows through

[0012]

According to the present invention, the stator core is formed by tightening the stacked iron cores with a plurality of tightening bolts penetrating in the axial direction, and at least one end of the stator core is supported by a support plate. The stator core can be easily wound around the stator core by annular winding. Further, the axial length of the stator core can be increased. Furthermore, since the number of tightening bolts is the same as the number of pole pairs and they are arranged at equal intervals around the yoke of the stator core, a circulating current flows through the tightening bolts without using an insulator on one support plate. Can not be.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a main part of a rotating electric machine according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a rotating electric machine according to another embodiment of the present invention.

FIG. 3 is a sectional view of a permanent magnet synchronous machine having a drum-shaped winding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator core 6 Stator winding 13 Permanent magnet 14 Tightening bolt 15 Support plate 16 Nut 17 Nut 18 Retaining ring

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-70154 (JP, A) JP-A-59-37854 (JP, A)

Claims (1)

(57) [Claims] 1. A rotating electric machine in which a rotor having an even number of magnetic poles is arranged on the inner diameter side or outer diameter side of a stator core, and the stator winding is wound around the yoke of the stator core by annular winding. Forming a stator core by tightening the stacked cores with a plurality of tightening bolts penetrating in the axial direction to form a stator core, extending at least one end of the tightening bolts, supporting them with a conductive support plate, and tightening the bolts. The number of poles is equal to the number of pole pairs (1/2 of the number of magnetic poles of the rotor), and the tightening bolts are arranged at equal intervals on the circumference of the yoke of the stator core. A rotating electric machine having a child winding.