JP4885616B2 - 3-phase rotating electric machine - Google Patents

Description

  The present invention relates to a three-phase rotating electrical machine, and more particularly, to a three-phase rotating electrical machine suitable for securing interphase insulation of each phase coil using interphase insulating paper.

  In a three-phase rotating electrical machine using distributed winding, interphase insulating paper is inserted between the coil phases in order to provide an insulation distance between the phases of the respective phase coils. For example, in a three-phase rotating electrical machine, interphase insulating paper is inserted between the U phase and the V phase, and between the V phase and the W phase.

  Since the interphase insulating paper is generally formed into a desired shape by cutting a flat insulating paper material or punching it with a press, the coil end insulating portion has a flat shape. For this reason, if you try to assemble it to the expanded and three-dimensional coil, the interphase insulating paper will be misaligned, or even if it is in the normal position when assembled, the interphase insulating paper will be inserted when the next phase coil is inserted. However, it is difficult to completely insulate the phases by interfering with coils of different phases and shifting their positions.

  In particular, a rotating electrical machine for driving a vehicle is strongly desired to be downsized, and the coil end of the stator must be shortened. For this reason, the amount of finished molding of the coil end becomes large, and even if the interphase insulating paper is assembled at the proper position when assembled, the shape of the coil is greatly deformed when forming the coil end, making it difficult to completely insulate the phases. .

  In view of this, various ingenuity has been proposed in which interphase insulating paper can be surely inserted between the coil phases, and sufficient insulation between the coil phases is ensured. One of them is known in which a three-dimensional nose portion is bonded to a planar interphase insulating paper (see, for example, Patent Document 1).

JP 2005-110417 A

  However, in the thing of patent document 1, since the creation process and adhesion process of a nose part were added, there existed a problem that a manufacturing process increased and the cost increased by that.

  An object of the present invention is to provide a three-phase rotating electrical machine using interphase insulating paper that can reduce the cost and has improved insulation between phases.

(1) In order to achieve the above object, according to the present invention, three-phase coils are sequentially wound around a rotor and a stator core by distributed winding, and the coil end portions of the three-phase coils are insulated by interphase insulating paper. A three-phase rotating electrical machine having a stator that is inserted into the plurality of slots of the stator before the three-phase coil is inserted, and inserted into the stator and the slot. A slot liner for ensuring insulation between the interphase insulating paper, after the first phase of the three-phase coil is inserted into the slot and before the second phase is inserted into the slot, is intended to insulation between phases between the first and second phases are inserted into the slot, the interphase insulating paper that is inserted into the slot of the stator, as well as parallel to each other, First and second slot insertion portions inserted into slots of the stator, and first and second coil ends integrally formed at both ends of the first and second slot insertion portions An insulating portion; the first and second slot insertion portions; the first and second coil end insulating portions; and four cut portions formed in the vicinity of the connection portion; and the first and second portions. Projected from the slot insertion part or the first and second coil end insulating parts and formed integrally, and formed at a position so as to cover at least one of the four notches when folded. And a protruding portion.
With this configuration, it is possible to reduce the manufacturing cost of the interphase insulating paper and improve the insulating properties between the phases.

  (2) In the above (1), preferably, the projecting portion of the interphase insulating paper has at least two places on the first and second slot insertion portions or the first and second coil end insulating portions. When connected and folded, it is formed at a position so as to cover at least two of the four cut portions.

  According to the present invention, it is possible to reduce the manufacturing cost of the interphase insulating paper and to improve the insulating properties between the phases.

Hereinafter, the configuration of a three-phase rotating electrical machine according to an embodiment of the present invention will be described with reference to FIGS.
First, the configuration of the three-phase rotating electrical machine according to the present embodiment will be described with reference to FIG.
FIG. 1 is a side view showing a configuration of a three-phase rotating electrical machine according to an embodiment of the present invention. In addition, in FIG. 1, the side shape of the state which removed the end bracket is shown.

  The three-phase rotating electrical machine according to the present embodiment includes a rotor 10 and a stator 20. The rotor 10 is supported rotatably with respect to the stator 20. The rotor 10 includes a rotating iron core 14 fixed to the shaft 12. The rotating iron core 14 is a laminate of thin steel plates. The rotary iron core 14 is formed with eight holes having a rectangular cross section in advance, and eight permanent magnets 16 are embedded in the holes. The permanent magnets 16 arranged at equal intervals in the circumferential direction of the rotating iron core 14 are magnetized so that the polarities of adjacent permanent magnets are opposite to each other.

  A predetermined gap is formed between the inner peripheral portion of the stator 20 and the outer peripheral portion of the rotor 10. The stator 20 includes a core 22 and three-phase coils 24U, 24V, and 24W. The core 22 includes a ring-shaped yoke core and a stator core formed so as to protrude radially on the inner peripheral side of the yoke core. A slot for inserting a coil is formed between adjacent stator cores. Here, 48 slots are formed. The yoke core and the stator core are integrally formed. The core 22 is a laminate of thin steel plates. The three-phase coils 24U, 24V, and 24W are wound with distributed windings arranged across a plurality of salient poles (stator cores). First, eight U-phase coils 24U are inserted into slots using an automatic coil insertion machine, and then eight V-phase coils 24V are automatically inserted into another slot. Before inserting the V-phase coil 24V, eight first interphase insulating papers 30 are inserted and positioned in advance in the slots into which the V-phase coil 24V is inserted. After the eight V-phase coils 24V, eight W-phase coils 24W are inserted into further slots. In addition, before inserting the W-phase coil 24W, eight second interphase insulating papers 30A are inserted and positioned in advance in the slots into which the W-phase coil 24W is inserted. Lead wires are taken out from the end portions of the three-phase coils 24U, 24V, and 24W, and terminals are fixed to the tips. Therefore, each of the three-phase coils 24U, 24V, and 24W can be energized by energizing the terminals. As each phase coil, enamel-coated copper wire is used.

  As described above, the rotating electrical machine shown in FIG. 1 is an 8-pole 48-slot distributed winding rotating electrical machine, and is an embedded magnet type synchronous motor when used as a motor. This motor is used, for example, as a motor for a four-wheel drive hybrid vehicle in which one of the front and rear wheels is driven by an engine, the four wheels are driven by a motor, and ice.

Next, the configuration and attachment state of the interphase insulating paper 30 used in the three-phase rotating electrical machine according to the present embodiment will be described with reference to FIGS.
FIG. 2 is a plan view showing the configuration of interphase insulating paper used in the three-phase rotating electrical machine according to the embodiment of the present invention. 3 and 4 show an attached state of interphase insulating paper used for a three-phase rotating electrical machine according to an embodiment of the present invention, FIG. 3 is a perspective view, and FIG. 4 is a side sectional view. FIG. 4 shows a state where the stator is cut in the axial direction and only one side of the shaft. The same reference numerals as those in FIG. 1 indicate the same parts.

  As shown in the figure, the interphase insulating paper 30 has a substantially rectangular shape with a central portion cut out into a square shape, and is formed of an insulating paper material. Since the size of the interphase insulating paper 30 is determined by the size of the rotating electrical machine, the size of the interphase insulating paper 30 varies depending on the size of the rotating electrical machine.

  The interphase insulating paper 30 includes coil end insulating portions 32A and 32B positioned above and below, slot insertion portions 34A and 34B, and a protruding portion 38.

  The coil end insulating portions 32A and 32B are located between the coil end portion of the U-phase coil 24U shown in FIG. 1 and the coil end portion of the V-phase coil 24V, and are used for insulation between the coil end portions. The slot insertion portions 34A and 34B are inserted into adjacent slots in the core 22 of the stator 20 shown in FIG. The slot insertion portions 34A and 34B are parallel to each other. The coil end insulating portions 32A and 32B and the slot insertion portions 34A and 34B are connected and integrated. That is, when the interphase insulating paper 30 is inserted into the stator core, the coil end insulating portions 32A and 32B have a shape of both end surfaces integrated so as to protrude from the vicinity of both end surfaces of the stator core.

  Cut portions 36A, 36B, 36C, and 36D are formed in the vicinity of the connection between the coil end insulating portions 32A and 32B and the slot insertion portions 34A and 34B. As will be described later with reference to FIG. 4, a slot liner is inserted into the slot before the coil is inserted into the slot. And when inserting a coil in a slot, in order to hold | maintain the slot liner which protruded from the side edge part of a slot, a cuff support is used. The cuff support is inserted from the outer peripheral direction of the stator in the radial direction. When the cuff support is inserted, the coil end insulating end that is a part of the coil end insulating portions 32A and 32B is formed in the cut portions 36A, 36B, 36C, and 36D. The parts 32A1 and 32B1 are deformed to facilitate the insertion of the cuff support. On the other hand, when the cuff support is pulled out, the coil end insulating ends 32A1 and 32B1 return to their original positions and are used for insulation between the coil end portions.

  The protruding portion 38 is provided at a position protruding from the vicinity of the connection portion between the coil end insulating portions 32A and 32B and the slot insertion portions 34A and 34B. When the interphase insulating paper 30 is mounted in the slots of the stator core, the protruding portion 38 is bent toward the coil end insulating portion 32B at the position indicated by the one-dot chain line in the drawing, and is positioned 38 ′ indicated by a broken line in the drawing. Positioned on. And the protrusion part 38 is provided in the position which overlaps with the notch part 36C in the bent state.

In the illustrated example, only one protrusion 38 is provided. That is, no protrusion is provided at a position overlapping with the notches 36A, 36B, and 36D. The reason for this will be described in detail with reference to FIG. 3. However, since the U-phase coil and the V-phase coil are closest to each other at the position of the cut portion 36C and are most likely to contact each other at the cut portion 36C, By bending the portion 38, the cut of the cut portion 36C is obscured to prevent the U-phase coil and the V-phase coil from coming into contact with each other to cause insulation failure. The position where the protrusion 38 is provided is as shown in the figure. In addition, it is not limited to the vicinity of the connection portion between the coil end insulating portion 32B and the slot insertion portion 34A, but may be provided at other positions as long as the cut portion 36C is covered in a bent state.

  Next, the mounting state of the interphase insulating paper 30 will be described with reference to FIG.

  The stator core 22 has a stator core formed so as to protrude in the radial direction. Between adjacent stator cores, slots 22S1, 22S2,..., 22S14 into which coils are inserted are formed. Slot liners 40 made of an insulating material for insulating between the stator core 22 and the coil are inserted into the slots 22S1, 22S2,..., 22S14. Most of the slot liner 40 is inserted into the slot, but its end protrudes from the end of the slot. The protruding portion of the slot liner 40 is bent. The bent portion of the slot liner 40 is engaged with both end portions of the core 22 to secure a spatial distance between the coil and the end surface of the core, and when the coil is inserted into the slot, the axial direction of the core 22 in the slot To prevent it from moving.

  A cuff support 50 is used to prevent the bent portion of the slot liner 40 from being deformed when the coil is inserted. The cuff support 50 is used in the same number as the number of slots. The cuff support 50 is inserted in the vicinity of the end face of the core 22 at a position between adjacent slots from the outer peripheral direction of the core 22. The operation of the cuff support 50 will be described later with reference to FIG.

  After the slot liner 40 is inserted into each slot, first, the U-phase coils 24U1 and 24U2 are inserted into the slots and wound around the stator by distributed winding. Here, for example, the U-phase coil 24U1 is inserted into the slot 22S2 and the slot 22S7, and the U-phase coil 24U2 is inserted into the slot 22S8 and the slot 22S13.

  Next, the interphase insulating paper 30 is inserted into the slot. The insertion position of the interphase insulating paper 30 is the position where the V-phase coil is inserted next, and is therefore the slot 22S4 and the slot 22S9. Thereafter, V-phase coils are inserted into the slots 22S4 and 22S9.

  Next, the insertion state of the cuff support 50 will be described with reference to FIG. 4A shows a state where the cuff support 50 has been inserted, and FIG. 4B shows a state where the cuff support 50 has been pulled out.

  As shown in FIG. 4A, a slot liner 40 is inserted inside the slot 22S. A cuff support 50 is used to hold the bent portion 40K of the slot liner protruding from the upper and lower ends of the slot 22S. The cuff support 50 is inserted from the outer circumferential direction (arrow RA direction) of the stator 22 in the radial direction. When the cuff support 50 is inserted, the coil end insulating end portion 32A1, which is a part of the coil end insulating portion 32A, is deformed as shown in the notches 36A and 36B shown in FIG. 2, and the cuff support 50 is inserted. make it easier.

  On the other hand, as shown in FIG. 4B, when the insertion of the coil is completed, when the cuff support 50 is pulled out in the direction of the arrow RB, the coil end insulating end portion 32A1 returns to the original position and the insulation between the coil end portions is obtained. Can be secured.

  Here, the reason why the protruding portion 38 is provided in only one of the four cut portions 36A, 36B, 36C, 36D will be described.

  After the U-phase coil, V-phase coil, and W-phase coil are inserted into the stator slot and wound around the stator core, the coil end portions protruding from both ends of the stator are respectively in the outer diameter direction of the stator. It is molded to be bent. The amount of protrusion of the coil end portion is different at one end (for example, the side where the coil end connection portion is provided) and the other end (the side where the coil end connection portion is not provided). The larger the molding amount, the closer the adjacent coils are. In the example of FIG. 2, the upper side is the side where the coil end connection portion is provided, and the lower side is the side where the coil end connection portion is not provided. Therefore, when the molding amount is larger on the side where the coil end connection portion is not provided, in the example of FIG. 2, the necessity of providing a protruding portion on the lower side becomes higher.

  In the example shown in FIG. 3, the left coil conductor of the U-phase coil 24U1 is inserted into the slot 22S2, and the left coil conductor of the U-phase coil 24U2 is inserted into the slot 22S8 and then inserted into the V The coil lead wire on the left side of the phase coil is inserted into the slot 22S4. On the other hand, the right coil conductor of U-phase coil 24U1 is inserted into slot 22S7, and the right coil conductor of the V-phase coil inserted thereafter is inserted into slot 22S9. Therefore, when viewed from the V-phase coil (that is, the coil inserted at the position where the illustrated interphase insulating paper 30 is inserted), the U-phase coil 24U1 is close to the left side (the side inserted into the slot 22S4). The number of slots is 2 slots apart. On the other hand, when viewed from the V-phase coil, the left side of the U-phase coil 24U2 is close to the right side (the side inserted into the slot 22S9), but is only one slot away. That is, they are closest. Therefore, in the example of FIG. 2, it becomes more necessary to provide a protrusion on the right side of the interphase insulating paper 30.

  As a result, the protruding portion provided on the interphase insulating paper 30 is on the lower side and on the right side. Therefore, by providing one protruding portion 38 shown in FIG. 2, insulation between the phases can be ensured. .

  The above is the interphase insulating paper that insulates the U phase coil and the V phase coil. However, when the W phase coil is inserted after the V phase coil, the interphase insulating paper for the W phase coil includes It is only necessary to provide a protruding portion on the left side and on the left side position (in the example of FIG. 2, a position that covers the cut portion 36D).

  As described above, according to the present embodiment, the interphase insulating paper has a coil end insulating portion and a slot insertion portion in an integral shape, and can be easily formed by punching or the like. Can be reduced.

  In addition, the interphase insulating paper is provided with a notch that makes it easy to insert the cuff support and ensures interphase insulation when the cuff support is pulled out, and further, the protruding portion is bent to cover the notch. Therefore, the insulation between phases can be improved.

Next, the configuration and attachment state of the interphase insulating paper 30 used in the three-phase rotating electrical machine according to another embodiment of the present invention will be described with reference to FIG.
FIG. 5 is a plan view showing a configuration of interphase insulating paper used in a three-phase rotating electrical machine according to another embodiment of the present invention. The same reference numerals as those in FIG. 2 indicate the same parts. The configuration of the three-phase rotating electrical machine according to the present embodiment is the same as that shown in FIG.

  In the present embodiment, in the configuration of the interphase insulating paper 30X, the coil end insulating portions 32A and 32B, the slot insertion portions 34A and 34B, and the cut portions 36A, 36B, 36C, and 36D are the same as the example of FIG. It is. In the present embodiment, the position shape of the protruding portion 38X is different from that in FIG.

  The protrusions 38X are located at two locations near the connection portion between the coil end insulation portion 32A and the slot insertion portion 34A, the coil end insulation portion 32B, and the connection portion between the slot insertion portion 34A and the main body side of the interphase insulation 30X. It is connected and has a larger shape than the example of FIG. When the interphase insulating paper 30X is mounted in the slot of the stator core, the protruding portion 38X is bent to the side of the coil end insulating portions 32A and 32B at the position indicated by the dashed line in the drawing, and is indicated by a broken line in the drawing. 38X '. And the protrusion part 38X is provided in the position which overlaps with the notch parts 36A and 36C in the bent state, and can wrap up both parts of the notch parts 36A and 36C by folding back the protrusion part 38X.

  As described above, when the right-side cut portions 36A and 36C of the interphase insulating paper 30X are compared with the left-side cut portions 36B and 36D, the U-phase coil and the V-phase coil easily approach at the position of the right-side cut portion. For example, when the molding amounts of the coil end portions at both ends are substantially equal, it is necessary to provide a protruding portion at a position covering the cut portions 36A and 36C. However, when the example of FIG. 2 is modified and two protrusions are provided, it is necessary to bend each protrusion. However, as in the present embodiment, a large protrusion that covers both notches. By doing so, the bending work is facilitated.

  In addition, when the protrusion 38X is bent and the interphase insulating paper 30X is assembled in the slot, the protrusion 38X is connected to the main body of the interphase insulating paper 30X at two locations, so that the position is stabilized even after being bent. It is possible to improve workability when the interphase insulating paper is assembled to the stator.

  As described above, according to the present embodiment, the interphase insulating paper has a coil end insulating portion and a slot insertion portion in an integral shape, and can be easily formed by punching or the like. Can be reduced.

  In addition, the interphase insulating paper is provided with a notch that makes it easy to insert the cuff support and ensures interphase insulation when the cuff support is pulled out, and further, the protruding portion is bent to cover the notch. Therefore, the insulation between phases can be improved.

  Moreover, workability | operativity can be improved also when covering the notch part of several places.

Furthermore, workability when the interphase insulating paper is assembled to the stator can be improved.

It is a side view which shows the structure of the three-phase rotary electric machine by one Embodiment of this invention. It is a top view which shows the structure of the interphase insulation paper used for the three-phase rotary electric machine by one Embodiment of this invention. It is a perspective view which shows the attachment state of the phase insulation paper used for the three-phase rotary electric machine by one Embodiment of this invention. It is side surface sectional drawing which shows the attachment state of the phase insulation paper used for the three-phase rotary electric machine by one Embodiment of this invention. It is a top view which shows the structure of the phase insulation paper used for the three-phase rotary electric machine by other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Low etc. 20 ... Stator 22 ... Stator core 22S ... Slot 24U, 24V, 24W ... Coil 30 ... Correlation insulation paper 32A, 32B ... Coil end insulation part 34A, 34B ... Slot insertion part 36A, 36B, 36C, 36D ... Notch part 40 ... Slot liner 50 ... Cuff support

Claims (2)

A three-phase rotating electrical machine having a rotor and a stator core in which three-phase coils are sequentially wound around the stator core and the coil end portions of the three-phase coils are respectively insulated by interphase insulating paper,
A slot liner that is inserted into each of the plurality of slots of the stator before the three-phase coil is inserted, and ensures insulation between the stator and the three-phase coil inserted into the slot;
The interphase insulating paper is inserted into the slot after the first phase of the three-phase coil is inserted into the slot and before the second phase is inserted into the slot. Insulate the phase between the second phase,
The interphase insulating paper inserted into the slot of the stator is
First and second slot insertion portions that are parallel to each other and inserted into slots of the stator;
First and second coil end insulating portions integrally formed at both ends of the first and second slot insertion portions;
The first and second slot insertion portions; the first and second coil end insulating portions; and four notches formed in the vicinity of the connection portion;
The first and second slot insertion portions or the first and second coil end insulating portions protrude from and integrally form, and when folded, at least one of the four cut portions is cut. A three-phase rotating electrical machine comprising a protruding portion formed at a position covering the portion. In the three-phase rotating electrical machine according to claim 1,
The protrusions of the interphase insulating paper are connected to the first and second slot insertion portions or the first and second coil end insulating portions in at least two places, and when folded, the four notches are cut. A three-phase rotating electrical machine, wherein the three-phase rotating electrical machine is formed at a position covering at least two of the cut portions.

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