JPS61227647A - Rotary electric machine of air gap winding type - Google Patents

Abstract

PURPOSE:To improve the assembling workability and the reliability by holding a stator coil by interphase insulating block in a circumferential direction and supporting the outer periphery by a binding band. CONSTITUTION:An insulating cylinder 13 formed in the inner shape in a circular shape and in the profile in a polygonal shape is coaxially disposed on the outer periphery of a rotor 12. Hexagonal stator coils 17 are wound in inner and outer layer windings along the outer periphery of the polygonal shape on the outer periphery of the cylinder 13. An inner insulating plate 18 is interposed between the inner layer and the outer layer, and an outer insulating plate 19 is coated on the outer periphery of the outer layer. Cooling longitudinal and peripheral grooves are formed on the cylinder 13 and the plates 18, 19. An interphase insulating block 22 disposed between the coil phases of stator coil 17 is implanted on the outer periphery of the cylinder 13. The outer periphery of the coil 17 is rigidly secured by a binding band 29 to the cylinder 13.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a rotating electric machine using a gap winding system in which a U-shaped coil is arranged in a gap, and particularly relates to a gap winding type rotary electric machine in which a U-shaped coil is arranged in a gap. Concerning winding type rotating electric machines.

[Technical background of the invention and its problems]

In recent years, large turbine generators and other machines have been receiving single-unit equipment and using superconducting rotating electric machines, but in conventional machines with slots in the stator core, the teeth of the stator core Since this creates magnetic and temperature constraints, a gap winding method has been adopted in which this slot is eliminated and the stator coil is wound in the gap.

This air-gap winding system is characterized by being slotless and having no teeth, which increases the space factor of the winding, makes effective use of empty spaces, and increases magnetic flux density.

However, on the other hand, the lack of slots makes it difficult to hold the stator coils.

Conventionally, this type of air-gap winding rotating electric machine has been developed as an "air-gap winding rotating electric machine" (Japanese Unexamined Patent Publication No. 58-1).
54350 to 15436 (published in the official gazette), examples of which are shown in FIGS. 10 and 11.

That is, a magnetic shield 1 formed into an integral cylindrical shape by laminating a large number of silicon steel plates is held at both ends by end plates 2 in a stator frame (not shown).

The inner periphery of the magnetic shield 1 is slotless and has no teeth, and a thin insulating inner cylinder 4 is coaxially disposed on the outer periphery of the rotor 3 with a required gap provided therebetween. A 211-turn stator coil 5 is disposed on the outer periphery of the thin insulating inner cylinder 4 in the circumferential and axial directions, and the outer periphery of the stator coil 5 is held down by an insulating presser plate 6. In the gap between the insulating holding plate 6 and the inner peripheral surface of the magnetic shield 1, a large number of Taber key-shaped wedges 7 are arranged in the circumferential direction and driven in the axial direction to fix the stator coil 5 to the magnetic shield 1. ing.

However, in such a conventional air-gap winding rotating electric machine, a large electromagnetic force acts on the stator coil 5;
The magnetic shield 1 did not have teeth, and furthermore, due to the lack of bending rigidity of the thin insulating inner part n5, the fixation of the stator coil 5 and support against electric torque were not sufficient.

Further, there was a problem that there was no cooling means for cooling the stator coil 5 (which caused a rise in temperature).

Such insufficient fixation of the stator coil 5 or rise in temperature may cause damage to the insulators or abnormal vibrations of the stator and child coils, resulting in a major accident.

Roughly tapered key-shaped I! ! ! Since a large number of parts 7 were required, the manufacturing and assembly work was poor.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and has a cooling means for firmly fixing the stator coil in the gap, cooling the stator coil, and has good assembly workability and reliability. The purpose of the present invention is to provide a rotating electric machine using a high air gap winding method.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention attaches a stator coil to the outer periphery of an insulating tube arranged in a cavity and having a polygonal outer shape, and connects the phases of the stator coil to the outer periphery of the insulating tube. The stator coil is supported in the circumferential direction by an interphase insulating block installed in the stator, the outer periphery of the stator coil is tightened to the insulating tube by a bind band, and the stator coil is cooled with a cooling medium such as cooling oil. .

(Embodiment of the Invention) Hereinafter, an embodiment of the present invention will be explained with reference to Figs. 1 to 9. In Figs. , the explanation of the duplicated parts will be omitted.

FIG. 1 is a longitudinal cross-sectional view of a main part showing the vicinity of a gap in an embodiment of the present invention, in which end plates 11 are used to connect both ends of a magnetic shield 10 formed into an integral cylindrical shape by laminating a large number of silicon steel plates. It is pressed and held within a stator frame (not shown). The inner periphery of the magnetic shield 10 is slotless and has no teeth, and an insulating cylinder 13 is coaxially arranged on the outer periphery of the rotor 12 with a required interval.

As shown in FIG. 5, the insulating cylinder 13 is made of a relatively thick cylinder, and has a circular inner shape and a polygonal outer shape.
A plurality of end cover mounting holes 14 extending in the axial direction are bored in the circumferential direction on both end faces.

Further, as shown in FIG. 4, a plurality of longitudinal grooves 15 extending in the axial direction and a plurality of circumferential grooves 16 extending in the circumferential direction are formed in the outer peripheral surface.

A stator coil 17 having a hexagonal shape as shown in FIG. 2 is wound around the outer periphery of the insulating tube 13 along each side of the polygonal outer periphery as shown in FIG. An inner insulating plate 18 is interposed between the inner layer and the outer layer, and an outer insulating plate 19 covers the outer periphery of the outer layer.

As shown in FIGS. 6 and 7, both the inner and outer insulating plates 18 and 19 are provided with longitudinal grooves 20 extending in the axial direction and circumferential grooves 21 extending in the circumferential direction on both the upper and lower surfaces, respectively.

An interphase insulating block 22 disposed between the coil phases of the stator coil 17 is implanted on the outer periphery of the insulating tube 13 as shown in FIG. That is, interphase insulation block 2
2 is firmly implanted by fitting into each obtuse angle portion 23 on the outer periphery of the insulating cylinder 13, and the insulating I! A stator coil 17 attached to the outer circumferential flat surface of the stator coil 13 is held in the circumferential direction. The mutual insulating block 22 is constructed as shown in FIGS. 1 and 8, and has comb-like teeth 24 connected in the axial direction. A plurality of outwardly opening key grooves 25, for example, two key grooves 25, are cut into each upper end edge of the toothed portion 24, and correspondingly, as shown in FIG. Key grooves 26 opening inward are each recessed. These key grooves 25 and 26 are aligned with each other and the key 27 is driven in the axial direction to firmly fix the upper end of the toothed portion 24 of the interphase insulating block 22 to the magnetic shield 10. Also,
In the lower part of the interphase insulating block 22, a plurality of notch grooves 28 extending in the axial direction are provided in series in the vertical (radial) direction on both left and right end surfaces.

The entire outer periphery of the outer insulating plate 19 is tightened by a bind band 29, and the entire stator coil 17 is firmly fastened to the insulating tube 13.

Further, both left and right ends of the annular space 30 defined by the outer peripheral surface of the insulating cylinder 13 and the inner peripheral surface of the magnetic shield 10 are liquid-tightly sealed by a pair of left and right end covers 31 . That is, the pair of end covers 31 have their inner peripheries connected to the end surface of the insulating cylinder 13 by screwing bolts or the like into the end mounting holes 14, and their outer peripheries are fixed to the end plates 11, so that the annular space 30 has a closed container structure that accommodates cooling oil 32 as a cooling medium. An oil supply pipe 33 for supplying cooling oil 32 into the annular space 30 is provided on one side of the end cover 31.
Drain oil 1 and 34 are attached to the other 31, respectively, so that cooling oil 32 flows through the annular space 30.

Note that reference numeral 35 in FIG. 1 is a sealing cover that liquid-tightly covers the outer periphery of the magnetic shield 10, and both left and right ends of the cover are fixed to a pair of end plates 11 by welding. Further, 36 is a barrier that guides the flow of cooling oil 32 in the annular space 30, 37 is a lead wire of the stator coil 17,
It passes through one end cover 31 and extends to the outside.

With this embodiment, the outer periphery of the stator coil 17 is firmly fixed to the insulating tube 13 by the binding band 29, and the interphase of the stator coil 17 is connected to the insulating tube 13 and the magnetic shield 10. Since it is insulated by the mutually insulating block 22 fixed to both sides and the circumferential direction is maintained, it is sufficiently supported against electric torque.

Cooling oil 32 is supplied to and discharged from the annular space 30 in which the stator coil 17 is accommodated, and the cooling oil 32 is distributed to the insulating cylinder 13, the inner and outer insulating plates 18, 19, and the mutually insulating block 22. grooves 15, 16, 20.
21.28 are arranged in the axial and circumferential directions, so
Stator coil 17 is directly cooled by cooling oil 32 .

In addition, in the present invention, the magnetic shield 10 is provided with cooling oil 32.
An oil groove for circulating the oil may be provided in the axial direction,
According to this embodiment, the magnetic shield 10 can be cooled more effectively by utilizing the natural convection of the cooling oil 32.

〔Effect of the invention〕

As explained above, the present invention provides a rotating electric machine of a gap winding type in which a stator coil is disposed in an annular gap defined by an annular stator core and a rotor, in which the outer periphery of the rotor is an insulating tube arranged coaxially and having a polygonal outer shape; a plurality of stator coils attached to the outer periphery of the insulating tube;
A plurality of mutually insulating blocks are implanted on the outer periphery of the insulating tube between the stator coils, and fix the upper portions of the plurality of teeth connected in the axial direction to the annular stator core, and the insulating tube and An end cover that liquid-tightly seals both ends of an annular space defined by the annular stator core and forms a cooling space through which a cooling medium flows, and an outer periphery of the fixed coil. The insulating tube and the interphase insulating block are each provided with a circulation groove through which a cooling medium flows, so that the stator coil is cooled by the cooling medium.

Therefore, according to the present invention, the stator coil is held in the circumferential direction by the interphase insulating block, and the outer periphery is supported by the binding band, so that the stator coil is firmly held in the gap.

Further, the stator coils are effectively cooled in the cooling space, and the number of sliding doors used is reduced, so that assembly workability and reliability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of essential parts of an embodiment of the air-gap winding rotating electric machine according to the present invention, FIG. 2 is a front view of a stator coil incorporated in the embodiment shown in FIG. 1, and FIG. is a side view of the stator coil shown in Fig. 2 attached to the outer periphery of the insulating cylinder,
Fig. 4 is a plan view of the insulating tube shown in Fig. 1, Fig. 5 is a side view of Fig. 4, and Fig. 6 is a partially cut away axial portion of the inner and outer insulating plate shown in Fig. 1. Plan view, Fig. 7 Gi is a front view of Fig. 6, Fig. 8 is a front view of a part of the interphase insulating block shown in Fig. 1, and Fig. 9 is an assembled state of one interphase insulating block shown in Fig. 1. FIG. 10 is a longitudinal sectional front view of the main part of the conventional example, and FIG. 11 is a side sectional view of the main part showing the main part of FIG. 10 in side section. 10... Magnetic shield, 11... End plate, 12...
Rotor, 13... Insulating cylinder, 17... Stator coil,
18...Inner insulation plate, 19...Outer insulation plate, 22.
... Mutual insulation block, 23... Obtuse angle part, 24...
Teeth, 25° 26...Keyway, 27...Key, 29
... Bind band, 30... Annular space part, 31...
End cover, 32...Cooling oil. Applicant's agent Hisana Hatano 2 Figure 3 (lq) Figure 9

Claims (1)

[Claims] 1. In a rotating electric machine of a gap winding type in which a stator coil is disposed in an annular gap defined by an annular stator core and a rotor, a coaxial coil is provided around the outer periphery of the rotor. an insulating tube arranged in the insulating tube to form a polygonal outer shape, a plurality of stator coils attached to the outer periphery of the insulating tube, and a plurality of stator coils installed on the outer periphery of the insulating tube between the phases of these stator coils, and an interphase insulating block that fixes the upper portions of the plurality of axially connected tooth portions to the annular stator core, and both ends of an annular space defined by the insulating cylinder and the annular stator core to be liquid-tight. an end cover that is sealed to configure this space into a cooling space through which a cooling medium flows; and a bind band that tightens the outer periphery of the stator coil to the insulating cylinder, A rotating electrical machine of an air gap winding type, characterized in that the stator coil is configured to be cooled by the cooling medium by recessed circulation grooves through which a cooling medium flows. 2. The air-gap winding type rotating electric machine according to claim 1, wherein the stator coil is a hexagonal coil or a multi-turn coil.