JPS58116034A - Salient-pole rotor for ac generator - Google Patents

Abstract

PURPOSE:To improve the output of an AC generator by spirally winding wire materials on a 2-pole salient-pole rotor core to form coils, thereby forming a structure durable against a centrifugal force. CONSTITUTION:A core 11 is formed by axially laminating many magnetic steel plates formed with a pair of salient poles 12, and is fixed to a rotational shaft 10. Wire materials are spirally wound on the core 11, thereby forming coils 13, 14. Insulating plates 15 made, for example, of synthetic resin are provided between the poles 12 of the core 11 and the coils 13, 14. In this manner, since the coils 13, 14 can endure stably against the centrifugal force, the reliability at the time of high speed rotation can be improved. Further, since the number of turns of the coils can be increased, the output can be improved, and the poles 12 can be widened in a circumferential direction.

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, single salient pole rotor suitable for use in an automatic alternator.

The rotor of a conventional self-excited alternating current generator has a core 1 made of laminated steel plates coupled to a rotating shaft 2, as shown in FIG. 1, for example. 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 are
They become poles and south poles and form a magnetic field. Therefore, by rotating this rotor, the alternating current output can be seen from the main generating coil (not shown) on the fixed 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, and therefore the strength of the bobbin 3 is It was necessary to keep it.

However, the bomb 3 made of synthetic resin could not be made very strong and had problems with reliability during high speed rotation. Furthermore, in order to prevent the coil 4 from flying out due to centrifugal force, it was necessary to wrap a band wire around the outer periphery, which was disadvantageous in terms of the number of parts and man-hours. Also, since the coil 4 is wound around the core 1 via the bobbin 3, it may be difficult to apply it to skew stacked cores. Furthermore, when the width of the salient pole 5 in the circumferential direction is increased, there is less space for winding the coil 4 (therefore, there is a defect that the ball width ratio becomes smaller).

The present invention has been made in view of these problems, and consists of winding wire rods around a core in the form of cross-overs to form a coil. Therefore, it has a structure that can withstand centrifugal force and can rotate at high speeds.Moreover, by directly winding the coil, the number of windings can be increased to improve output.In addition, by increasing the pole width, efficiency can be improved. It becomes possible.

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

A coil 13 is wound around this core 11 using a wire. What must be noted here is that the coils 13, 142>f are directly wound around the core 11Vc along both end surfaces and side surfaces of the core 11 in a cross-cut pattern. 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 is the rotating shaft 1.
o, and the lower part passes on the right side of the rotation axis lO. Note that when winding the coils 13 and 14, the coil 1
It is preferable to alternately wind coils 3 and 14. In other words, after winding coil 13 a predetermined number of times,
A well-balanced rotor can be constructed by winding the coil 13 a predetermined number of times, then winding the coil 13 again, and then alternately winding the coil 13 in the same manner. Note that these coils 13 and 14 and core 1
For example, an insulating plate 1 made of synthetic resin is placed between the salient pole 12 of 1
5 is interposed.

As described above, since the coils 13 and 14 of the rotor according to this embodiment are wound around the core 11 in a cross-legged manner,
The structure supports centrifugal force. In other words, the rotation causes the second
When a centrifugal force is generated as indicated by arrow 16 in the figure, this centrifugal force is converted into tension as indicated by arrow 17. This tension will be shared by the wires forming the coils 13,14. Therefore, there is no need to provide a member such as a bobbin that receives centrifugal force (or a band to prevent the coils 13 and 14 from popping out). 4.
Improves reliability during high-speed IK rotation.

Furthermore, in this rotor, since the coils 13 and 14 can be directly wound over a wide range of the side surface of the core 11 without using a bobbin, the number of turns is large (which increases the output of the generator). In addition, for those who are winding the wire directly around the core 11K, it is also possible to wind the coils 13 and 14 around a skew stacked core in which a large number of magnetic steel plates are laminated with slight shifts in the circumferential direction. can be equipped.

Also, without using a bobbin, the coil 13
．． 14 is wound around the core IIK, the salient pole 12 can be made wider in the circumferential direction as shown by the chain line 12' in FIG. Therefore, a rotor with a large ball ratio can be provided.

The coils 13 and 14 shown in FIGS. 2 and 3 are connected in series, and a DC excitation current is supplied via a slip ring (not shown).Then, the pair of salient poles 12
The pole and the south pole are respectively magnetized. Therefore, as the rotor rotates, power generation output is taken out from the main power generation coil on the stator side (not shown). For the excitation current, an auxiliary generator coil is provided separately from the main generator coil.
This output is full-wave rectified and supplied.

In addition, a diode is connected in series to the series circuit of coils 13 and 14.
[By making it a closed circuit, it can be used as a rotor for a brushless automatic generator. In this case, the alternating current voltage induced in the coils 13 and 14 is half-wave rectified by the above-mentioned diode, and the half-wave rectified field current is used to excite the field current, and the capacitor excitation effect of the stator is also used to generate power. be made to do.

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-shaped manner, it has a structure that can withstand centrifugal force and is highly reliable at high speeds. This improves the performance and eliminates the need for a member to hold down the coil. In addition, since the coil of the core is wound (the space becomes wider and the ball ratio is thicker), the output of the generator is improved and the efficiency is improved.Furthermore, according to the present invention, since the bobbin can be omitted, the skew It can also be applied to 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 front view of a salient pole rotor of a conventional alternator. is the same perspective view. In addition, in the reference numerals used in the drawings, 11... Core 12... Salient pole 13. 14... Coil. Applicant Sawafuji Electric Co., Ltd.

Claims (1)

[Claims] A rotor in which a coil is wound around a two-pole salient pole type rotor core is characterized in that the coil is formed by winding wire rods around the core in a cross-shaped manner. Polar rotor.