JPH02290138A - Salient-pole rotary-field synchronous machine - Google Patents

Abstract

PURPOSE:To reduce thermal grade even if a field winding has a large number of turns, to improve the cooling capacity of the whole of the field winding mentioned above and to make it lightweight and compact by integrally inserting or rolling in heat dissipation plates among conductors of which the field winding consists, and projecting a part of the heat dissipation plate from the outer peripheral surface of the field winding mentioned above. CONSTITUTION:A field winding 10 is such that a magnetic pole insulation 3 is applied to the surface of a magnetic pole core 2, insulating collars 4a and 4b are inserted, and a pillar copper wire 5 covered with an insulated coating is subsequently wound up in the radial direction 6 and widthwise 7 along the surface of the magnetic pole core 2. In the event of the winding up, heat dissipation plates 11 are rolled-in or inserted together with the pillar copper wire 5 every two steps of radial windings of a rotor. At that time, the heat dissipation plate 11 has a longer width than that of the field winding and has the same length as the axial length of the magnetic pole, and when it is rolled in or inserted in the field winding 10, it is projected from the outer peripheral surface 8 of the field winding 10.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a salient pole rotating field type synchronous machine, and particularly to a structure with improved cooling and heat dissipation capabilities of the field winding. It is.

(Prior art) Figure 6 shows insulation! 1ll: A field winding is formed by winding a covered rectangular copper wire, and is a sectional view showing the main part of a salient pole rotating field type synchronous machine equipped with this field winding.

As shown in the figure, the field winding 1 is constructed by applying a magnetic pole insulation 3 to the surface of a magnetic pole core 2, inserting insulating collars 48, 4b, and inserting an insulated rectangular copper wire 5 into the magnetic pole. It is wound along the surface of the iron core 2 in the radial direction 6 and width direction 7 so as to form steps.

Incidentally, the field winding 1 generates heat when an excitation current is passed during operation of the synchronous machine. This heat generation is transmitted to the magnetic pole iron core 2 and the outer circumferential surface 8 of the field winding 1, and is radiated into the air. The cooling air inside the synchronous machine promotes this heat dissipation effect and improves the cooling effect of the field winding 1. In this case, the cooling air flows only to the outer circumferential surface 8 of the field winding 1, which is the heat dissipation surface.
When the number of windings is large in the width direction 7 of the field winding 1, a temperature gradient occurs due to heat transfer in the insulating coating that constitutes the field winding 1. As a result, in the width direction 7 of the field winding 1,
The temperature gradient becomes large.

(Problems to be Solved by the Invention) Cooling of the field winding 1 is one of the important points in order to reduce the size and weight of a synchronous machine. In the case of the field winding 1 configured by winding an insulated rectangular steel wire 5, the larger the number of windings in the width direction 7, the larger the temperature gradient in the width direction 7. The field winding l is cooled by heat transfer to the iron core 2, but this temperature gradient causes the temperature of the entire field winding 1 to rise by -L, which is a factor that hinders miniaturization and weight reduction. was desired.

The present invention reduces the thermal gradient even when the field winding has a large number of windings in the width direction, and reduces the overall cooling capacity of the field winding.
The purpose of this invention is to provide a salient pole rotating field type synchronous machine that is lightweight.

[Structure of the Invention]' (Means for Solving the Problems) The present invention is directed to a salient pole rotating field type synchronous machine having a field winding formed by winding an insulated conductor. A heat sink is integrally provided by being inserted or wrapped between the conductors constituting the magnetic winding, and a portion of the heat sink is made to protrude from the outer peripheral surface of the field winding.

(Function) Since the heat sink is inserted or wrapped between the field windings, the temperature gradient can be significantly reduced compared to conventional field windings. Figure 4 shows an example in which the average of the field winding without a heat sink is set to 1.0, and the standardized temperature distribution in the width direction inside the field winding is compared for cases without a heat sink and with a heat sink. Shown below.

The reason why the temperature-reverse gradient is reduced is that the conventional field winding is shown in Figure 5 (
As shown in a), conductors such as rectangular copper wires are coated with insulation, so heat transfer is not smooth and the heat transfer path is mainly between the cables in the width direction of the rectangular copper wires. However, as shown in Figure (b), in the field winding of the present invention, since the heat sink protrudes from the outer peripheral surface of the field winding, the heat radiation area where heat is exchanged by the cooling air increases. In addition, since the heat sink is inserted in the radial direction of the magnetic pole (indicated by numeral 6 in Fig. 6), the heat transfer path is only in the width direction of the field winding (indicated by numeral 7 in Fig. 6). Rather, the heat of the rectangular copper wire adjacent to the heat sink is transmitted in the radial direction, and is transmitted and radiated in the width direction through the heat sink.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing essential parts of an embodiment of the present invention.

In the figure, the field winding 10 includes magnetic pole insulation 3 applied to the surface of the magnetic pole core 2, insulation collars 4a and 4b inserted, and
A rectangular copper wire 5 covered with insulating limbs is sequentially wound in the radial direction 6 and width direction 7 along the surface of the magnetic pole core 2. A heat sink l1 as shown in FIG. 2 is wound or inserted together with the rectangular copper wire 5 at every second stage of the winding. Here, the heat sink ll is formed, for example, into a rectangular shape from an aluminum plate, and is longer than the width of the field winding IO and has a length comparable to the axial length straight portion of the magnetic pole, When wound into or inserted into the field winding 10, it is made to protrude from the outer circumferential surface 8 of the field winding 10.

As described above, by winding or inserting the heat sink U, a part of the heat sink 1l protrudes from the outer peripheral surface 8 of the field winding IO.
The heat radiation area where heat is exchanged with the cooling air inside the synchronous machine increases, and the heat generated in the rectangular copper wire 5 near the center on the inner circumferential side of the field winding 10 is transferred via the heat radiation plate 1l. , the temperature of the entire field winding IO can be lowered by effectively dissipating heat and reducing the temperature gradient inside the field winding IO.

Therefore, with the above configuration, the heat dissipation area and the heat transfer path increase, so the temperature gradient in the width direction 7 of the field winding 10 can be reduced, and thereby the field The temperature rise of the entire magnetic winding IO can be reduced compared to the conventional field winding 1. This allows the field current to be increased by about 10 to 25% with the same size field circuit if temperature rise is not a problem with the conventional configuration.

In the above embodiment, the heat dissipation plate l1 has a rectangular shape, but a notch lla may be provided as shown in FIG. This notch lla is used when a known coil bracket is inserted between the poles in order to prevent the field winding IO from escaping when the core length is long.

【Effect of the invention〕

As explained above, according to the present invention, the temperature rise in the field winding can be reduced compared to the conventional structure.

Generally, when trying to make a synchronous machine smaller and lighter, the excitation current of the field increases and the temperature rise of the field winding tends to increase, but by applying the present invention, the temperature rise of the field winding can be reduced. This makes it possible to increase the output even if the size is the same, and it is also possible to provide a smaller and lighter synchronous machine with the same output.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a main part of an embodiment of the present invention, FIG. 2 is a perspective view showing a heat sink used in an embodiment of the present invention, and FIG.
The figure is a perspective view showing a heat dissipation plate different from that shown in Fig. 2, Fig. 4 is an explanatory view showing the effect of the present invention, and Fig. In the explanatory diagrams, (a) shows the conventional field winding, (b) shows the case of the field winding of the present invention, and FIG. 6 shows the main parts of the conventional salient pole rotating field type synchronous machine. FIG. 2... Field iron core, 3... Magnetic pole part insulation, 4a
, 41+... Insulating collar 8... Outer peripheral surface, l1... Heat sink.

Claims (1)

[Claims] In a salient pole rotating field type synchronous machine having a field winding formed by winding a conductor coated with insulation, a heat sink is inserted or wound between the conductors constituting the field winding. 1. A salient pole rotating field type synchronous machine, characterized in that a salient pole rotary field type synchronous machine is provided, and a part of the heat sink is made to protrude from the outer peripheral surface of the field winding.