JPS5895951A - Salient-pole type rotor - Google Patents

Abstract

PURPOSE:To raise the cooling efficiency of a salient-pole type rotor by providing a ventilating duct axially passing between the bases of a plurality of poles of a rotor core, thereby uniformly distributing the temperature of a rotor coil. CONSTITUTION:A 4 salient-pole type poles 2 are, for example, formed around a rotor core 1, and a field coil 4 is wound via insulators 3 at the side of the poles 2. A ventilating duct 6 faced via the end face of the oil 4 at both sides and the insulators 3 in parallel with a rotational shaft 5 is provided over the entire axial length. In this manner, part of cooling air, for example, by a cooling fan is flowed in the duct 6 of the salient-pole type rotor. Accordingly, the coil 4 which is disposed in the vicinity of the base end of the pole 2 which is relatively slow at the peripheral speed can be preferably cooled.

Description

[Detailed description of the invention] The present invention relates to a salient pole rotor.

BACKGROUND ART Conventionally, in a rotating electrical machine such as a synchronous generator, a salient pole rotor constituting a rotating field has generally had a structure shown in FIG. 8. That is, in the 8th @, 31
is a field core, and its 11 surroundings Krj are formed with, for example, a salient pole-shaped magnetic pole having a four-pole configuration, and a field coil is wound on the side of each of these magnetic poles via an insulating material. equipped.

In such a structure O salient pole type I trochanter, it is preferable to avoid copper loss due to Joule heat during operation of the generator. A large cooling fan (not shown) attached to the generator 35 is moved and rotated by the rotating shaft 35, and the outside air for cooling is circulated within the generator to cool the rotor including the field coil, the stator, etc. method is adopted.

However, it is assumed that the desired cooling effect can be obtained because the circumferential speed of the part near the tip of the magnetic pole blade of the field coil is relatively high, and that part of the field coil near the base end of the magnetic pole blade is However, the cooling efficiency was poor and the iI variation distribution of the entire field coil became non-uniform.

In order to increase the cooling effect, methods have been adopted such as increasing the diameter of the rotor to increase the heat dissipation area of the entire i-trochanter, and increasing the same speed of the field coil. According to the above, the salient pole rotor becomes larger, which inevitably leads to the larger size, weight, and cost of the entire rotating electric machine such as a generator.

The present invention has been proposed in view of the above points, and its purpose is to promote cooling of particularly high-temperature parts of the rotor coil such as the field coil, and to make the temperature distribution of the rotor coil uniform. In addition to increasing cooling efficiency, it can contribute to reducing the size and weight of rotating electric machines without increasing the size of the rotor.
Furthermore, it is an object of the present invention to provide a sub-salient pole type rotor which enables highly efficient excitation without disturbing the protection of magnetic flux.

That is, the present invention attempts to achieve the above object by providing a ventilation duct parallel to the rotation axis between the base ends of the plurality of magnetic poles constituting one rotor core.

The present invention will be explained below with reference to FIG.

FIG. 1 shows an embodiment of all of the present invention, in which l is a field core as a rotor core, and its (D
@ Surrounding VcFi For example, a magnetic pole 2 of a protrusion iMM consisting of a laminated structure with a 4-pole configuration is formed, and field coils 4 as rotor coils are wound on the sides of this magnetic pole 2 through insulating lft3. equipped. Therefore, between the base ends of the adjacent magnetic poles 20, ventilation parallel to the rotating shaft 5 is provided so as to face the end face of the field coil 4, which is wound around the inner a-pole 2, through the insulating material 3. A duct 6 is provided through each rotor over the entire axial length of the rotor. This ventilation duct) 6tlj, when viewed from the cross section of the rotor, is rather large as it cuts out the base end of the magnetic pole 20 and narrows the path of magnetic flux, and its cross-sectional shape and cross-sectional area do not affect the forward magnetic path as much as possible. It is desirable that the cross section is approximately a quarter circle as shown in Figure tIE1, or approximately isosceles triangular in cross section as shown in Figures 3 to 6, which will be described later.

The salient pole rotor according to the present invention formed in this way is
For example, it is suitable for use in the main generator of a brushless generator driven by an internal combustion engine, as shown in FIG.

The outline of this brushless generator will be explained according to FIG. 2. The drive shaft of the internal combustion engine (not shown) is attached to one end of the rotating shaft 5Fi and is driven by a large cooling fan 11.
12, and the other end is fixed to the casing 13 by a bearing 1.
4) It is rotatably supported.

The main generator is fixed to the rotating shaft 5 and operates as a nine-rotation field.
Salient pole rotor 10 according to the present invention and casing [
The armature core 16 and armature coil 17 are fixed to the armature 1stj casing 13 by bolts.

Excitation generator Bti Main generator Excitation voltage 1 to field coil 4
Lt - This is for flowing, and includes a rotor 18 fixed to the rotating shaft 5 and a fixed field a19 fixed to the casing 13.
The fixed field 19 is composed of a field core n and a field coil field.

A ring-shaped collar is fixed to the armature coil on the side near the main generator A, and a rectifier δ is attached on the conductive plate on the side of the main generator A of this collar scrap, and a rotating rectifier is installed. It consists of

This rotation *tita26 is for supplying the current generated in the armature coil 21 of the excitation generator B to the nine field coil 4 provided in the salient pole type rotor lOK of the main generator as an excitation current. be.

In the figure, 4 is a vent hole drilled in the bracket 28, 4 is a cooling outside air exhaust port formed above the cooling fan 11 at the upper end of the casing 13, and 30 is a vent hole for increasing ventilation efficiency. It is a guide.

Next, the operation of the present invention will be explained with reference to FIG. 2. The rotary wheel 5 is driven by an internal combustion engine (not shown), and the cooling fan 11 is accordingly rotated to draw outside air from the vent n. is inhaled. This outside air flows through the generator in various airflows as shown by broken lines in Fig. 2, passes through the ventilation guide (supply) and the cooling fan 11, and is exhausted from the exhaust 029. A part of the air flows through the ventilation duct 6 of the salient pole rotor 100 according to the present invention toward the cooling fan 11 . During this period, the salient pole rotor lO, which is rotating at a relatively slow speed of 1ta, is of course cooled by the outside air flowing along the rotation axis 5 direction.
A part of the coil 4, that is, a part of the field coil 4 located near the base end of the magnetic pole 2, is suitably cooled by the outside air flowing through the ventilation duct 6. Coupled with the part of the field coil 4 whose circumferential speed is high and cooling is promoted, the entire field coil 4 is cooled almost uniformly and efficiently.

At the same time, the outside air flowing through the ventilation duct 6 also contributes to cooling a part of the field core l facing this ventilation duct 6.
The center pole rotor IO can obtain a large cooling effect as a whole by the ventilation duct 6.

Next, FIG. 3 shows a second embodiment of the present invention. In this embodiment, a heat dissipating plate 7a with good thermal conductivity is interposed inside the insulating material 3 facing the ventilation duct 6 and inside the insulating material 3 along the height direction of the magnetic pole 2, and a cross section of the ventilation duct 6 is provided. can also be constructed to have a substantially isosceles triangle shape.

By doing this, the heat of the field coil 4 is actively dissipated in the direction of the ventilation duct 6 by the action of the heat sink 71, and -1
A remarkable cooling effect can be obtained.

Fig. 4 shows the third embodiment, and Fig. 5 shows the fourth embodiment. A case where the heat dissipation plate 7c is provided on a part of the inside of the insulating material 3 (see FIG. 4) and a case where the heat dissipation plate 7c is provided only on the inside of the insulating material 3 facing the ventilation duct 6 are shown (see FIG. 5).

i9 As a fifth embodiment, a heat sink 7d is used as shown in FIG.
We are also planning to form a large number of protrusions 7 on the part facing the ventilation duct 6 to increase the heat dissipation area and improve the heat dissipation effect.

Furthermore, FIG. 7 shows a sixth embodiment, in which the entire field core l as the rotor core including the magnetic poles 2 is appropriately distorted, that is, skewed. Thereby, the ventilation duct 6 formed in the field core 1 is also skewed, and as the rotor rotates, the ventilation duct 6 itself can act as a fan and contribute to cooling.

At the same time, the surface area of the field core l facing the ventilation duct 6 and the field coil 4 (not shown) are skewed.
The surface area of is also increased, and the heat dissipation area can be increased by -f-.

Note that the nine-zorashiless generator shown in FIG. 2 is exemplified as an example of the application of the present invention, and the scope of application of the present invention is not limited to this in any way, and may include rotation of different types of generators, synchronous motors, etc. Needless to say, it can also be used as a child.

As described above, according to the present invention, since the ventilation duct parallel to the rotation axis is provided between the base ends of the plurality of magnetic poles constituting the rotor core, the cooling effect of the entire rotor is In addition to dramatically improving performance, the rotor coil can be appropriately cooled, and the temperature distribution of the entire field coil can be maintained uniformly along with the rest of the field coil.
This has the effect of providing effective cooling.

In addition, since there is no need to increase the size of the rotor for cooling as in the past, it is possible to make each rotor smaller and, by extension, to make rotating electric machines such as generators smaller and lighter, which contributes to reducing manufacturing costs. In addition to the advantages, the present invention is also easy to manufacture in that the present invention can be constructed by adding a small amount of processing to a conventional rotor.

Furthermore, by installing the ventilation duct between the base ends of the magnetic poles, it has almost no effect on the magnetic path within the magnetic poles, but rather directs the magnetic flux flowing within the rotor core from one magnetic pole to the other. Since it has the effect of efficiently bending and flowing, it has effects such as effective excitation.

[Brief explanation of the drawing]

FIG. 1 is a half-longitudinal sectional view showing the first embodiment of the present invention;
The figure is a vertical cross-sectional view of a brushless generator, FIGS. 3 to 6 are half-longitudinal cross-sectional views showing second to fifth embodiments, respectively, and FIG.
The figure is a partial perspective view showing an embodiment of II6, and FIG. 8 is a half longitudinal sectional view showing a conventional example. l... Field core, 2... Magnetic pole, 3... Insulating material, 4
...Field coil, 5...Rotating shaft, 6...4 duct, 7m, 7b, 7c, 7d...Heat dissipation material, 7...
Protrusion, IO... salient pole rotor. Patent applicant Hokuetsu Kogyo Co., Ltd.

Claims (1)

[Claims] Between the base ends of the plurality of magnetic poles that make up the rotor core,
11. A salient pole rotor characterized by having nine ventilation ducts running through it parallel to the rotation axis.