JPS6237041A - Rotary electric machine - Google Patents

Abstract

PURPOSE:To treat a terminal easily by respectively displacing the end section of a stator coil in an edge-bending multilayer winding manner in each layer, bringing corresponding layer into contact with each other in the coil end section and eliminating the need for a division into the plural of a conductor. CONSTITUTION:Inserting sections 71 for a coil 7 inserted into a slot for a stator are laminated in parallel in the vertical direction so that planes in respective layer conductor 8 are directed along the circumferential direction of a core 5, an insulating coating 3 is inserted between the inserting sections 71, and the whole circumference is surrounded by a ground insulating layer 4. The coil is edge-bent on the outside of the slot, and each layer conductor 8 is twisted at approximately 90 deg. so as to be directed in the radial direction of the core 5 in coil end sections 72A, 72B. Corresponding layers have upper and lower relationship under the state in which the coil 7 is inserted into the slot in terminal sections 73A and 73B. The size ratios of width to thickness of the conductors are increased, thus eliminating the need for the division of respective layer conductor. Accordingly, coil width W3 is reduced, thus easily treating the terminal sections of the coil 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a rotating electric machine, particularly a rotating electric machine having a helically bent multi-layered stator coil.

[Conventional technology]

Figure 5 shows the structure of the stator coil in a conventional rotating electric machine.
It is shown in FIG.

The stator fill is manufactured by first winding an insulated conductor, for example, a double glass wound copper wire, a predetermined number of times to form a pre-molded coil having the shape shown in FIG. Next, this coil is molded and shown in Figure 5 (n).

[The coil is shaped as shown in El. Figure 5 shows a front view, and Figure 1g5 shows a side view. This coil is usually called a hem-bending coil because it is hem-bent at the point J in the forming process. 1g5
Figure 1cl is the same as Figure 5 (V 10-V tcl in the sword).
It shows the cross section of the wire, where 12) is the unit conductor, (J is the insulation coating applied to each unit conductor, and (4) is the ground insulation applied to the outer periphery of all the conductors that make up the coil. '@7 The reason is that the coil shown in Figure 5 tA) is inserted into the slot groove of the stator core (5).
) is the stator core, (61J, (62) is the slot groove provided on its inner circumferential surface, and (7+ is the stator coil inserted into the predetermined slot groove. +q is the center of the stator core. , (R1 is the arc length % between the slots into which the stator coils are inserted (W and J indicate the width of the slot grooves, respectively.

In such a configuration, when energized, a harmonic current flows through the stator coil t711, so that an eddy current is generated inside the conductor of the stator coil, resulting in heat loss. The thicker the coil conductor, the thicker the eddy current becomes, so helically bent coils are often used as a countermeasure.

In the case of helical-bending coils, if the width/thickness ratio and bending diameter of the conductor are not appropriate during the forming process during the manufacturing process, buckling or twisting of the conductor and damage to the conductor's insulation coating will occur. To prevent this problem, we divided the cross-sectional area of the conductor required for the function of the rotating electrical machine into multiple parts, and reduced the width/thickness ratio of each part to a range that allows for helical bending. It was necessary to manufacture a coil. FIG. 5 (C1 shows one example, in which an insulated conductor divided into three parts is wound six times.

[Problem that the invention seeks to solve]

Conventional helical-bending multilayer coils for stators are constructed as described above, so that functionally unnecessary insulating layers are interposed adjacent to the plurality of conductors in the same layer, and the coil width ° dimension (Fig. 5 (
(W, ) ) at O is increased. In addition, the width dimension (W2) of the slot groove had to be made larger than the above-mentioned coil width dimension (W, ) in order to prevent the ground insulating layer (4) from being damaged by the rigidity against deformation of the coil. , also in the coil insertion process shown in FIG. Since the value of 1 changes correspondingly, the coil (7) had to be inserted while being deformed.

For the above reasons, there is a problem in that the width dimension (W2) of the slot groove includes a functionally unnecessary dimension, which deteriorates thermal efficiency.

This invention was made to solve these problems, and provides a helically bent multilayer coil for a stator that can eliminate functionally unnecessary insulating layers and reduce the rigidity of the coil. The purpose of the present invention is to provide a rotary machine equipped with the following functions.

[Means for solving problems]

In this invention, when forming a multilayer coil, a single bare conductor that is not divided into a plurality of layers in the same layer is
The coil is wound, each layer conductor is displaced at the coil end, and the corresponding layers are brought into contact and connected at the coil end.

[Effect]

In this invention, by molding a bare conductor, there is no need to worry about damage to the insulation, and the edge bending part can be easily processed. Therefore, the width/thickness ratio of the conductors in the same layer can be increased, and there is no need to divide the conductors. As a result, the coil width dimension (W) becomes smaller. In addition, by displacing the coil end by approximately 90 degrees, the conductors of each layer to be connected will be located opposite each other, making it easier to connect the conductors in each layer and perform interlayer insulation processing, making it easier to The volume is also smaller.

[Embodiments of the invention]

An embodiment of the present invention shown in diagram M1 will be described below.

@Figure 1 (The sword is a front view of the bent multilayer coil, the same figure (a
is a side view, the same figure (0 is 1tcl-1t in the first diagram rule)
Cross-sectional view from the Q line, the same figure (Il is the same as Fig. 1 + Al
FIG. In these figures, (71) is the slot groove (61J, (6
2), the cross section of which is shown in Figure 1 (a), each layer conductor (8) is laminated in parallel in the vertical direction so that its plane follows the circumferential direction of the iron core. has been done.

(3) is interlayer insulation of each layer, and (4) is ground insulation. (
72A) and (72B) are the coil end parts, and each layer conductor is displaced about 90 degrees from the state in the insertion part (71), so that the plane of each layer conductor is in the radial direction of the iron core, as shown in FIG. 1 (D). C73k) is the terminal part of one coil end part (72A), and (73B) is the terminal part of the other coil end part (72B), each having the above-mentioned configuration. Therefore, the coil or slot groove (61
), (62), the respective layer conductors of both terminal products are arranged facing each other in a top-to-bottom relationship, as shown in Figure @2. For this reason, the shape of the terminal portion of each layer conductor (73A) forming the coil is shown in Figure 1 (74).

By increasing +ptz of (73B) by 3,
When the four 1ai bodies are positioned facing each other in a vertical relationship as shown in Figure 2, the flat parts of the wide terminals m (74) abut against the wide terminals of the mutually opposing layers, so that they remain in that state. Connections will be made between the corresponding layer conductors.

It goes without saying that insulation can be achieved by inserting an appropriate interlayer insulating plate between conductors in adjacent layers that should not be connected. FIG. 4 shows the positional relationship of each terminal part in order to explain this situation. (74A) and (74B) are the terminal portions of the corresponding layer conductors to be connected, respectively, and (8) is an interlayer insulating plate.

In addition, in FIG. 2 and FIG. 4 (75).

(76) are lead wires for connection to adjacent coils.

〔Effect of the invention〕

Since this invention is configured as described above, it is possible to increase the ratio of the width and thickness of the conductor, and there is no need to divide each layer conductor into multiple pieces, so the width of the coil (W3 ) can be made smaller. In addition, since interlayer insulation can be applied after the molding process, insulation @
It is possible to make the insulating layer thinner. Furthermore, with regard to work hardening of the conductor during the forming process, it is possible to reduce the rigidity of the coil by annealing it, and after inserting the terminal connection into the slot groove of the stator core, the rigidity of the coil To be able to do it in a lower +C condition ≦, the width dimension of slot a (W2) and the width dimension of the coil (W, )
This makes it possible to reduce the difference between the two.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention, where fAl is
Front view of hem-bending multilayer coil, IB+ is side view, (c
) is a sectional view taken from line I (C) -1 (c) in (A), (DJ is the same < I (D) - in (A)
It is a sectional view taken from line I (D). Fig. 2 is a schematic diagram showing the above embodiment inserted into the slot groove J/ of the stator core, Fig. 3 is a schematic diagram showing an example of the shape of the coil end, and Fig. 4 is the connection configuration of the end part. 5 shows the configuration of a conventional stator coil, where (A) is a front view, (B) is a side view, and (C) is a V (C) in (A).
-V (1, which is a cross-sectional view of the CJ line, Figure 6 is a schematic diagram showing the coil before forming, and Figure '1 is a schematic diagram showing the above conventional coil.
! , 1 is a schematic diagram showing a state in which the electronic iron core is inserted into a slot groove. In the figure, (1) is the edge bending point, (2) is the unit conductor, and (3)
is the insulation coating, (4) is the ground insulation layer, (5) is the stator core,
(61) and (82) are slot grooves, and (7) is a stator coil. Note that the same reference numerals indicate the same or corresponding parts. Agent: Masuo Oiwa, Patent Attorney Figure 1 (C) Figure 2 Figure 6 Figure 7

Claims (2)

[Claims] (1) In a device having a helically bent multilayer stator coil, the coil end portions of the stator coil are displaced for each layer, and the corresponding layers are brought into contact and connected at the coil end portions. A rotating electrical machine featuring: (2) The rotating electric machine according to claim 1, wherein the rotating electric machine is displaced by twisting approximately 90 degrees.