JP2015089243A - Stator of rotary electric machine and rotary electric machine including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the stator of a rotary electric machine capable of improving a conductor space factor, avoiding a complicated shape of an insulating paper and preventing a conductor film from being scratched when stator coils projected from a stator core are bent in individual directions, and a rotary electric machine having the same.SOLUTION: A stator of a rotary electric machine comprises: a cylindrical stator core 2 having a large number of slots formed on the inner diameter side; a stator coil constituted of a conductor 31 and a film 32 formed in the outer peripheral part of the conductor; and an insulating paper 4 arranged in the slot in addition to the film 32. The stator coil having a plurality of conductors 31 arranged in one slot and having a different phase is arranged in at least one of the large number of slots and has an approximately trapezoidal cross section. The thickness of the film is different between a first part constituting sides corresponding to the upper and lower bases of the approximately trapezoidal cross section and a second part constituting two other sides connecting the sides corresponding to the upper and lower bases.

Description

  The present invention relates to a stator for a rotating electrical machine and a rotating electrical machine including the stator.

  In the stator of a rotating electrical machine, the shape of the conductor wound around the stator core has a rectangular cross section, thereby improving the space factor of the conductor in the slot and thus reducing the copper loss of the rotating machine. In order to improve the efficiency of the rotating machine, it has been attempted.

  As a specific example, there is one that forms a stator of a rotating electrical machine by laying a conductor having a rectangular cross section so that a stator coil is laminated in a radial direction in a slot provided in a stator core. (Patent Document 1).

  In the stator described in Patent Document 1, insulating paper is disposed in the slot so as to block between the conductor and the inner wall of the slot. Further, the insulating paper is also arranged so as to block the contact of each laid conductor. This is to ensure insulation between the stator core and the conductor and to prevent the outer periphery of the conductor from being damaged when the conductor is inserted into the slot. In addition, there is a place where a different-phase conductor is inserted in one slot. An insulating film is applied to the outer periphery of the conductor, but corona discharge may occur between conductors of different phases. In order to prevent this, insulating paper is disposed between the conductors.

  In addition, as a method for ensuring insulation between conductors, the thickness of the insulating film formed on the outer peripheral portion of the flat rectangular conductor is set to a different thickness on the long side and the short side, and the directions in which the film is thick contact each other. Some have a direction (Patent Document 2).

Japanese Patent No. 5028293 Japanese Patent Publication No.49-35942

  For example, in the structure of Patent Document 1, since the insulating paper is arranged around each flat rectangular conductor in the slot, the proportion of the insulating paper in the slot increases, and the space factor of the conductor in the slot increases. descend. Further, since the insulating paper is arranged around each of the rectangular conductors, the amount of the insulating paper used is increased and the shape of the insulating paper is complicated. Furthermore, since the shape of the insulating paper is complicated, it is required to increase the accuracy of the work of placing the insulating paper in the slot and the work of placing the insulating paper around each conductor in addition to the shaping of the insulating paper It becomes.

  Further, in the structure of Patent Document 2, it is possible to omit the arrangement of insulating paper around each conductor to avoid the complexity of the insulating paper shape. However, after the conductor is inserted into the slot, the conductor protrudes from the stator core. In a stator that needs to bend the parts in different directions, the outer periphery of the conductor comes into contact with each other without intervening insulating paper, so when the conductor is bent in different directions, the insulation film part is damaged. Resulting in.

  Therefore, the present invention improves the conductor space factor, avoids a complicated insulating paper shape, and prevents the conductor film from being damaged when the stator coil protruding from the stator core is bent in different directions. An object of the present invention is to provide a stator for a rotating electrical machine that can be used and a rotating electrical machine including the stator.

  In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above-mentioned problems. For example, a cylindrical stator core having a large number of slots formed on the inner diameter side, a conductor, and an outer peripheral portion of the conductor. A stator of a rotating electrical machine, comprising: a stator coil configured by a coating film; and an insulating paper disposed in the slot separately from the coating film, wherein the stator coil is disposed in one of the slots. A plurality of conductors are arranged, a stator coil of a different phase is arranged in at least one of the plurality of slots, and the stator coil has a shape having a substantially trapezoidal cross section, The thickness of the first trapezoidal cross section constitutes the first portion constituting the side corresponding to the upper base and the lower base, and another two sides connecting the sides corresponding to the upper base and the lower base It is different in the second part

  According to the present invention, the conductor space factor is improved, the complicated insulating paper shape is avoided, and the conductor film is prevented from being damaged when the stator coil protruding from the stator core is bent in different directions. It is possible to provide a stator of a rotating electrical machine capable of achieving the above and a rotating electrical machine including the same.

It is a perspective view which shows the structure of the stator of the rotary electric machine which concerns on an Example. It is sectional drawing of the stator coil with the cross-sectional shape of this trapezoid which concerns on an Example. It is sectional drawing of the stator core provided with the stator coil and insulating paper of the rotary electric machine which concerns on an Example. It is sectional drawing of the stator core provided with the stator coil and insulating paper of the rotary electric machine which concerns on an Example. It is a perspective view of the coil end part of the rotary electric machine which concerns on an Example. It is a deformation | transformation sectional drawing of the stator core provided with the stator coil and insulating paper of the rotary electric machine which concerns on an Example.

  Embodiments will be described below with reference to the drawings.

  First, the stator of the rotating electrical machine according to the present embodiment will be described with reference to FIG.

  A stator 1 for a rotating electrical machine shown in FIG. 1 is a stator of a so-called three-phase rotating electrical machine having a U phase, a V phase, and a W phase, and a rotor (not shown) is disposed on the inner diameter side of the stator core. Is inserted as a rotating electrical machine. The stator shown in FIG. 1 can be used for both induction machines and synchronous machines by changing the rotor, and can be used for both motors and generators. As a main component of the stator 1 of the rotating electrical machine, there is a stator core 2 in which thin electromagnetic steel plates are punched and laminated in a cylindrical shape. After the outer peripheral portion of the stator core 2 is laminated, the lamination is maintained by welding several places. In order to maintain the lamination, in addition to welding the outer peripheral portion, a method may be used in which the cylindrical interior is partially extruded and the overlapping thin plates are fixed using the extruded portion.

  The stator core 2 has several magnetic pole portions protruding toward the center of the cylindrical portion on the inner peripheral side of the cylindrical portion, and several magnetic pole portions are formed at equal intervals on the inner periphery of the cylindrical portion. Yes. Further, by forming several magnetic pole portions, slot portions are formed at equal intervals in the circumferential direction between adjacent magnetic pole portions. A stator coil 3 is inserted into the slot portion to form a winding of the stator, and insulation is provided between the slot portion and the stator coil 3 in order to ensure insulation between the stator core 2 and the stator coil. Paper 4 is inserted.

  In the following example, the number of magnetic pole portions is 72, and the number of slot portions is 72. The stator has a lead wire portion that is led out from a stator coil 3 that forms a winding. A terminal portion 5 is provided at the tip of the lead wire portion for connection to a rectifier such as an inverter. Yes. In this embodiment, since the stator is assumed to be a three-phase rotating electric machine, there are three terminal portions 5 of U phase, V phase, and W phase.

  FIG. 2 shows a cross section of the stator coil 3 inserted into the slot portion of the stator core 2 of FIG. The stator coil 3 in FIG. 2 includes a conductor part 31 and an insulating film 32. The cross-sectional shape of the stator coil 3 in FIG. 2 is composed of two substantially parallel sides having different lengths (sides corresponding to the upper base and the lower base) and two other sides connecting the two sides. It has a trapezoidal shape.

  The cross-sectional shape of the conductor part 31 is manufactured by using a drawn die shape as a trapezoid. An insulating film 32 is applied to the outer periphery of the conductor 31. When the thickness of two substantially parallel sides (sides corresponding to the upper base and the lower base) of the trapezoidal shape is t1, and the thickness of another two sides connecting the two parallel sides is t2, t2 is determined from t1. It is thick.

  This time, the conductor 31 is assumed to be a copper wire, and the insulating film 32 is assumed to be a so-called enameled wire such as a polyamide-imide type or a polyimide type. Possible resins may be selected.

  FIG. 3A shows a part of a cross section when the stator 1 of the rotating electrical machine of FIG. 1 is cut along a plane perpendicular to the axial direction. Insulating paper 4 in which the stator coil 3 and the U-shaped tip 41 are bent is inserted into the slot portion of the stator core 2. In FIG. 3A, one row of four stator coils 3 is inserted into the slot from the inner diameter side toward the outer diameter side. The four stator coils 3 show a cross section of the trapezoidal shape, and the length of two substantially parallel sides constituting the trapezoidal shape from the inner diameter side to the outer diameter side in the slot of the stator core 2. The sides and short sides are arranged alternately. By disposing the long side and the short side alternately in this way, the gap in the slot can be suppressed, and the conductor space factor in the slot can be improved.

  In FIG. 3A, among the stator coils 2 arranged in the slots of the stator core 2, the film thickness t2 of the side in contact with the conductors is the film thickness t1 of the side in contact with the stator core 2 via the insulating paper 4. It is thicker. Since the side t2 where the film thickness is thick is arranged on the side where each conductor is in contact, the distance between the conductor portions 31 of the conductor is twice the distance t2. Since the discharge phenomenon between normal conductors can be suppressed more effectively by increasing the distance between the conductors, the distance between the conductors should be ensured by arranging the conductors as shown in FIG. It becomes possible to suppress the discharge phenomenon. 3A, the insulating paper 4 inserted in the slot is in contact with the stator core 2 via the insulating paper 4 because the stator core 2 and the stator coil 3 are in contact with the stator core 2 through the insulating paper 4. The thickness t3 is secured, and the insulation distance between the stator coil 3 and the stator core 2 can be secured by t1 + t3.

  FIG. 3B shows an example in which the opening of the insulating paper on the U-shape arranged in the slot is on the inner diameter side. In FIG. 3A, in the vicinity of the stator coil 3 positioned at the outermost part, the U-shaped tip 41 is folded and overlapped to be disposed between the stator core 2 and the stator coil 3. A portion where the paper 4 overlaps exists, and the space factor of the conductor is lowered. Therefore, the space factor in a slot can be improved more by match | combining the slot opening part of the stator core 2, and the opening part of the insulating paper 4 on a U-shape.

  FIG. 4 shows the vicinity of the armature conductor 3 protruding from the stator core. As shown in FIGS. 3A and 3B, four stator coils 3 inserted in slots formed in the stator core 2 are inserted in a row from the inner diameter side to the outer diameter side of the stator core. The end of the stator coil 3 protruding from the end of the stator core after being bent is bent to a predetermined position in the circumferential direction and connected to the end of the stator coil 3 bent in the opposite direction from the other slot, This winding constitutes a fixed. Here, as shown in FIGS. 3A and 3B, in the slot of the stator core 2, the conductors 3 are arranged in the trapezoidal cross section so that the long sides and the short sides are alternated. Therefore, among the conductors inserted in a row in one slot, when the stator coils 3 protruding from the stator core 2 are alternately bent in the circumferential direction, the stator coil 3 is bent to the long side. Since the contact sides of the conductors are away from each other, the conductors can be prevented from being damaged when the conductors are bent. After the stator winding is configured, liquid varnish or the like may be poured into the slot portion of the stator core 2 in which the stator coil 3 is inserted.

  FIG. 5 shows a case where the shape of the insulating paper 4 in FIG. 3A is O-shaped. In FIG. 3A, the U-shaped insulating paper 4 is shown. However, since the slot opening of the stator core 2 and the U-shaped insulating paper opening are in the same direction (direction facing the inner diameter side), The leading edge of the insulating paper may protrude. When there is such a possibility, the above possibility can be avoided by adopting an O-shaped insulating paper.

  In the above configuration, the stator 3 of the rotating electrical machine has the configuration described with reference to FIGS.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.

DESCRIPTION OF SYMBOLS 1 ... Stator 2 ... Stator iron core 3 ... Stator coil 31 ... Conductor part 32 ... Insulating film part 4 ... Insulating paper 41 ... Tip part of U-shaped insulating paper 5 ... Terminal part 5U ... U-phase terminal part 5V ... V Phase terminal 5W… W phase terminal

Claims (7)

A cylindrical stator core in which a number of slots are formed on the inner diameter side;
A stator coil composed of a conductor and a coating formed on the outer periphery of the conductor;
A stator of a rotating electrical machine provided with insulating paper disposed in the slot separately from the film,
The stator coil is configured by arranging a plurality of conductors in one slot,
A stator coil of a different phase is disposed in at least one of the plurality of slots,
The stator coil has a substantially trapezoidal cross section,
The thickness of the film is such that the first portion constituting the side corresponding to the upper base and the lower base in the substantially trapezoidal cross section, and another two sides connecting the sides corresponding to the upper base and the lower base The stator of the rotary electric machine different in the 2nd site | part which comprises. A stator for a rotating electrical machine according to claim 1,
A stator of a rotating electrical machine in which the thickness of the second part of the coating is thicker than that of the first part. A stator for a rotating electrical machine according to claim 2,
A stator of a rotating electrical machine in which the conductor is arranged in a direction in which the outer peripheries of the conductors contact each other on the other two sides connecting the sides corresponding to the upper and lower bases in the slot. A stator for a rotating electrical machine according to claim 3,
A stator of a rotating electrical machine in which the conductor is arranged so that sides corresponding to the upper base and sides corresponding to the lower base alternately appear in the radial direction in the slot. A stator for a rotating electrical machine according to claim 4,
A stator of a rotating electrical machine, wherein the stator coil bends a conductor portion protruding from a stator core in a direction of a longer side among sides corresponding to the upper base and the lower base. A stator for a rotating electrical machine according to any one of claims 1 to 4,
The insulating paper is a stator of a rotating electric machine having a substantially U shape or a substantially O shape. A stator for a rotating electrical machine according to any one of claims 1 to 6,
A rotor rotatably disposed on the inner diameter side of the stator;
Rotating electric machine with