JPS58198136A - Air gap winding type rotary electric machine - Google Patents

Abstract

PURPOSE:To rigidly hold the stator coil section in a circumferential direction by a method wherein a magnetic shield is provided at its inner peripheral part with a locking groove, a pair of insulating spacers are fitted between stator coils and into the locking groove, and then insulating wedges and insulating press wedges are fitted to widen the insulating spacers. CONSTITUTION:A magnetic shield 11 is provided at its inner peripheral part with axial locking grooves 11a. Then, a pair of insulating spacers 13 separated and spaced in a circumferential direction are fitted into a each locking groove 11a and between adjacent stator coils 4. Next, a pair of insulating wedges 14 separated in a circumferential direction are inserted between the paired insulating spacers 13. Subsequently, a pair of insulating press wedges 15 separated in a radial direction are axially driven into between the wall of the locking groove 11a and the upper end of the insulating wedges 14 to press the insulating wedges 14 in a radial direction, so that the stator coil 4 is rigidly held in a circumferential direction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air-gap winding rotating electric machine in which a stator coil is mounted on the slotless inner circumference 8B of a magnetic shield on the stator side.

In recent years, in rotating electric machines, due to the increase in single machine capacity and the progress of superconducting rotating electric machines, the 1lliVc slot of the directing constantor has been eliminated.
Air gap winding systems equipped with stator coils are now being adopted.

The features of air gap winding rotating electric machines are that the stator core has no teeth, and the stator coils are placed in the air gap area to increase the space factor and make effective use of empty space.
Among other things, the magnetic flux VIi degree of the stator coil portion can be increased. However, the lack of a seat makes it difficult to hold the stator coils.

This type of air gap winding rotary electric machine according to the prior art is shown in FIG. +11 is a magnetic shield formed into an integral cylindrical shape by laminating a large number of silicon steel plates, etc. Both layers are held down by a dowel plate (2), which is held within the stator frame (not shown). The inner peripheral surface is circular and has slots Zl,
iC is on. (3) is a thin-walled insulating inner cylinder shaped to surround the outer circumference of the rotor (83) at intervals, for example,
It is made of epoxy resin glass fiber material or epoxy resin glass cloth material, and is wound into a cylindrical shape. (4) is a large number of stator coils arranged around the outer periphery 11 of the insulating inner cylinder (3), which shows the case of two-layer winding, and consists of an upper D (4a) and a lower opening (4b). (57 is applied to the outer periphery of each stator coil (4) and is divided into multiple parts in the circumferential direction by an IJi presser plate), and is made of, for example, an epoxy resin glass cloth laminate. ( 6) is the upper opening (4a) and lower opening (4b)
) interposed between nine interlayer insulation plates, (7J is each stator coil (41iQ K tied insulation spacing piece).

By the way, electromagnetic force in the circumferential direction is generated in each stator coil (4) by energization. This electromagnetic force becomes stronger as the capacity increases. In the prior art described above, when the capacitance increases, the electromagnetic force cannot sufficiently hold the stator coil in the circumferential direction (there is a risk that the stator coil may move in the circumferential direction). , each insulator is damaged, leading to an accident.

This invention provides axial locking on the inner circumference of the magnetic shield.
B is provided, and a pair of insulating spacing pieces divided into two in the circumferential direction and spaced apart are fitted between the stator coils and into the above locking groove, and a pair is divided into two in the circumferential direction. An insulating wedge is inserted between the l pairs of insulation spacing pieces, divided into two in the radial direction, and nine pairs of insulation suppressing wedges are driven in the axial direction into the upper ends of the insulating wedges in locking connection, thereby reducing the l pairs of insulation spacing pieces. The object of the present invention is to provide an air-gap winding rotating electric machine in which the stator coil portions are held firmly in the circumferential direction by compressing the stator coil portions so as to expand them.

FIG. 3 is an enlarged sectional view corresponding to FIG. 2 showing an air gap winding rotary machine according to an embodiment of the present invention, and (a) s (4) * (taL (4b)
+ (6J +177 is the same as that of the prior art described above. jl17 is a magnetic shield, which is laminated and formed into a cylindrical shape and is held within a stator wall (not shown).

The inner surface of this magnetic shield (II) has no slots, but axial locks @(l1m) are provided at multiple locations in the circumferential direction. αno is these locking grooves (
Part 1a) is an insulating holding plate which is attached to the outer periphery of each stator coil (4) and is made of, for example, an epoxy resin glass cloth laminate. The haze is a magnetic shield (1.
la) It is arranged in a position relative to the VC and the upper part is fitted,
A plurality of pairs of insulating spacing pieces are fitted between the stator coils (4) and are divided into two, each pair having a space between them, and made of the same material as the above-mentioned insulating spacing pieces (7). It has become.

(14 is divided into two parts in the circumferential direction, and inserted between one end of the above-mentioned insulating interval, and has a pair of insulators (rust), and both joint surfaces are formed as inclined surfaces in the height 6 direction. It is divided into two parts in the radial direction, and has a magnetic shield (1υ locking groove (ll
A pair of insulation suppression wedges are driven in the axial direction between the upper end of the insulation wedge (a) and the upper end of the insulation wedge (14), and both joint surfaces are formed as inclined surfaces in the thickness direction. The insulating wedge (14) is pressed in the radial direction, thereby applying a pressing force so that the pair of insulating spacing pieces a field spreads in the circumferential direction, and each stator coil (4) is strengthened in the circumferential direction. and magnetic shield (lυ locking @ (lla) K
It is accepted.

In the rotating electric machine of the above embodiment, the stator coil (4)
When the coil is energized, an electromagnetic force acts on it, and it tries to move in the circumferential direction, but the pair of insulating spacers between the coils are caught by the magnetic shield 0's locking pin, and it moves. is prevented. 1 pair of insulation spacing pieces 0! l is the insulating wedge of the threshold (1
4, it is suppressed so as to be expanded in the circumferential direction. (9) A pair of insulation suppressing wedges Q4 are driven in the axial direction, pressing the pair of insulation wedges Q4 in the radial direction, expanding them in the circumferential direction, and preventing them from loosening in the radial direction. ing.

450 is a sectional view corresponding to FIG. 3 showing another embodiment of the present invention. 0@ is a magnetic shield (locking @
(lla) The VC upper part is fitted and the stator coil (4
) is an insulating spacer piece for a pair of two parts, which is fitted in a gate, and is L-shaped with a gap between both sides, and the horizontal side protruding in the circumferential direction is on the corresponding stator coil (4) side. Input g is in contact. This extends the creepage distance from the stator coil (4) to the magnetic shield (+1). A pair of insulation wedges (I4) are inserted between one end of the pair of insulation gaps, and a pair of insulation suppression wedges V~ are driven into the upper end side in the axial direction.

FIG. 5 is a sectional view corresponding to FIG. 3 showing another embodiment of the present invention, Jl. A pair of L-shaped insulating spacing pieces Oη and α- divided into two are placed between the stator coils (4) in two stages, and the upper end of the upper insulating spacing piece is a magnetic shield (11). It is fitted into the lock @ (Ha).

Insulating wedges 4 and 11 for each l pair of insulating spacing pieces aη, - are inserted in two stages, and the upper 11il
lIIIVc A pair of insulating suppression wedges α field are driven in the axial direction. This configuration facilitates assembly and provides a significant supporting effect, especially in the case of stator coils with multilayer windings.

In addition, in the above embodiment, the magnetic shield (the latch #
(lla) and insulation spacing pieces and insulation (rust) are arranged for every two stator coils (4) in the circumferential direction, and the number may be increased or decreased as necessary.

In the embodiment shown in FIG. 5 above, the insulating spacing pieces and the insulating wedges may be stacked in two stages, or may be stacked in a larger number of stages.

As described above, according to the present invention, a locking groove is provided in the inner peripheral part of the magnetic shield, and the magnetic shield is divided into two parts in the circumferential direction, and a pair of insulating spacer pieces are connected to adjacent stator coils with an interval in the middle. inserting a pair of insulating wedges between the pair of insulating spacers, which are divided into two in the circumferential direction, and inserted between the pair of insulating spacers, and the above-mentioned locking groove;
A pair of insulation suppressors divided into two in the radial direction (drive a wedge in the axial direction between the insulation wedge and the locking groove, press the pair of insulation wedges, and press the pair of insulation spacing pieces in the circumferential direction)
Since the stator coil portion is pressurized so as to be expanded in the direction ′, the stator coil portion can be held at a strong vAVc in the circumferential direction.

[Brief explanation of the drawing]

ailE is a vertical sectional view of an air gap winding part showing an air gap winding rotating electrical machine according to the prior art, FIG. 2 is an enlarged sectional view at s1 On-nmK, and FIG. FIGS. 4 and 5 are enlarged sectional views corresponding to FIG. 3 of the air gap winding part showing the electric machine, and FIGS. 3-Insulated inner cylinder, 4-Stator coil, 7-・Extreme m+1li
l partition, 11...magnetic shield, 1la--locking groove,
13... Insulating spacing piece, 14... Insulating wedge, Yu5-
Insulated pressure wedge, 16. l), 18-・Insulating spacing piece, 1
9.20... Insulating wedge Note that the directional symbols in the drawings indicate the same or equivalent parts. Agent S# - (1 other person) Figure 1 Figure 2 Figure 3 Figure 4 Figure 4

Claims (1)

[Claims] Fil A plurality of stator coils are arranged on the outer periphery of an insulating inner cylinder, and a Vc insulating spacing piece is fitted between these stator coils,
In a rotating electrical machine with this assembly on the inside of the magnetic shield, the magnetic knoll has axial locking grooves arranged at multiple locations in the circumferential direction on the inner circumferential part, and the magnetic knoll is divided into two in the circumferential direction. A pair of insulating spacing pieces are fitted across the adjacent stator coils and the locking groove with an interval V between the two, and the upper dd pair of insulating spacing pieces are divided in the circumferential direction. a pair of insulating wedges inserted between the partitions, and a pair of insulating wedges that are divided into two in the radial direction and driven in the axial direction between the locking groove and the upper end of the insulating wedge, and the pair of insulating wedges are radially An air-gap winding rotating electrical machine characterized by comprising a pair of insulation suppression wedges that apply force in a direction such that the pair of insulation spacing pieces spreads in a circumferential direction. (2) The pair of insulating spacing pieces are each formed in an L shape,
2. The air gap winding rotating electric machine according to claim 1, wherein the protruding horizontal side portions come into contact with the side surfaces of the corresponding stator coils. (3) The air gap winding rotating electric machine according to claim 1 or 82, characterized in that l pairs of insulating spacing pieces and a pair of insulating wedges are stacked in multiple stages in the radial direction.