JPS6347065B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a salient pole rotor for an alternating current generator, and more particularly to a coil winding structure of a two-pole salient pole rotor suitable for use in a self-excited alternator.

The rotor of a conventional self-excited alternator is, for example,
As shown in the figure, a core 1 made of laminated steel plates is coupled to a rotating shaft 2. A coil 4 is wound through a bobbin 3 at a symmetrical position with respect to the rotation axis 2. By passing an excitation current through this coil 4, the salient poles 5 on both sides of the core 1 become N and S poles, forming a magnetic field. Therefore, by rotating this rotor, an AC output can be taken out from the main generating coil (not shown) on the stationary side.

The disadvantage of such a conventional rotor is that a part of the centrifugal force generated in the coil 4 must be received by the flange 6 formed on the bobbin 3, so the strength of the bobbin 3 must be increased. It was necessary.
However, the bobbin 3 made of synthetic resin could not be made very strong and had problems in reliability during high speed rotation. Furthermore, the band wire 7 must be wound around the outer circumference of the coil 4 to prevent the coil 4 from flying out due to centrifugal force, which is disadvantageous in terms of the number of parts and man-hours. Also, the coil 4 is connected to the core 1 via the bobbin 3.
It was difficult to apply it to skew-loaded cores because it was wrapped with Furthermore, when the width of the salient pole 5 in the circumferential direction is increased, the space for winding the coil 4 becomes smaller, resulting in a defect that the ratio of the pole width becomes smaller.

The present invention has been made in view of these problems, and involves winding wire rods around a core in a cross-over manner to form a coil. Therefore, it has a structure that can withstand centrifugal force, can rotate at high speed, and can increase the number of windings by directly winding the coil to improve output. Furthermore, by increasing the pole width, efficiency can be improved.

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 2 and 3, the rotor of the self-excited alternator according to this embodiment includes a rotating shaft 10, and a core 11 is fixedly attached to the rotating shaft 10. There is. The core 11 is made of a large number of magnetic steel plates laminated in the axial direction, and a pair of salient poles 12 are formed at both ends of the core 11 in the diametrical direction, offset by 180 degrees from each other.

A coil 1 is connected to this core 11 by a wire.
3 is wrapped. What must be noted here is that the coils 13 and 14 are directly wound around the core 11 in a cross-over manner along both end surfaces and side surfaces of the core 11. That is, the upper part of the coil 13 passes on the right side of the rotating shaft 10 in FIG. 3, and the lower part passes on the left side of the rotating shaft 10. On the other hand, the upper part of the coil 14 passes on the left side of the rotating shaft 10, and the lower part passes on the right side of the rotating shaft 10. In addition, when winding the coils 13 and 14,
Preferably, the coils 13 and 14 are wound alternately. That is, by winding the coil 13 a predetermined number of times, then winding the coil 14 a predetermined number of times, then winding the coil 13 again, and then alternately winding the coil 13 in the same manner, a well-balanced rotor can be constructed. Note that between these coils 13 and 14 and the salient pole 12 of the core 11, there is an insulating plate 1 made of synthetic resin, for example.
5 is interposed.

In this way, the rotor coil 1 according to this embodiment
Since the wires 3 and 14 are wound around the core 11 so as to cross each other, the wires have a structure that can withstand centrifugal force. That is, when centrifugal force as shown by arrow 16 in FIG. 2 is generated due to rotation, this centrifugal force is
It is converted into the tension shown by 7. This tension is the coil 1
This will be shared by the wire rods composing parts 3 and 14. Therefore, there is no need to provide a member such as a bobbin that receives centrifugal force, or the coils 13, 1
There is no need for the band 4 to prevent it from popping out. Since the coils 13 and 14 can stably withstand centrifugal force in this manner, reliability is improved especially during high-speed rotation.

Furthermore, in this rotor, the coil 1 is spread over a wide area on the side surface of the core 11 without using a bobbin.
Since the wires 3 and 14 can be directly wound, the number of turns can be increased, and the output of the generator can be improved. Furthermore, since the wire is wound directly around the core 11, the coils 13 and 14 can also be wound around a skew-stacked core in which a large number of magnetic steel plates are laminated while being slightly shifted in the circumferential direction. can. Furthermore, since the coils 13 and 14 are wound around the core 11 in a cross-over manner without using a bobbin, the salient pole 12 can be made wider in the circumferential direction as shown by the chain line 12' in FIG. can. Therefore, a rotor with a large pole ratio can be provided.

The coils 13 and 14 shown in FIGS. 2 and 3 are connected in series and supplied with a DC excitation current via a slip ring (not shown). Then, the pair of salient poles 12 are magnetized into N and S poles, respectively. Therefore, as the rotor rotates, power generation output is taken out from the main power generation coil on the stator side (not shown). Note that the excitation current is supplied by providing an auxiliary power generation coil separately from the main power generation coil, and full-wave rectifying the output thereof.

Note that by connecting a diode in series to the series circuit of the coils 13 and 14 to form a closed circuit, it can be used as a rotor of a brushless self-excited generator. In this case, the AC voltage induced in the coils 13 and 14 is half-wave rectified by the diodes,
The half-wave rectified field current is used to excite the magnet, and the stator capacitor excitation effect is also used to generate power.

As described above, since the rotor of the present invention is constructed by winding coils around a two-pole salient pole core in a cross-wound manner, the rotor has a structure that can withstand centrifugal force and is highly reliable at high speeds. In addition to improving the performance, a member for pressing the coil can be omitted. In addition, the space for winding the core coil becomes larger and the pole ratio becomes larger, which improves the output and efficiency of the generator. Furthermore, since the present invention can omit a bobbin, it can also be applied to skew stacked cores.

[Brief explanation of drawings]

Fig. 1 is a front view of a salient pole rotor of a conventional alternator, Fig. 2 is a front view of a salient pole rotor of an alternator according to an embodiment of the present invention, and Fig. 3 is a perspective view of the same. It is a diagram. In the reference symbols used in the drawings, 11... core, 12... salient pole, 13, 14... coil.

Claims (1)

[Claims] 1. A rotor comprising a two-pole salient pole type rotor core with a coil wound thereon, wherein the coil is formed by winding wire rods around the core in a cross-over manner. mold rotor.