JP2022019474A - Stator of winding and rotary electric machine - Google Patents

Abstract

To provide a stator of a rotary electric machine that improves insulation in a slot by using windings laminated by winding an insulating sheet around a plurality of uninsulated conductors and insulating between the conductors.SOLUTION: In a winding 1 according to the present invention in which a winding element 1A is formed that provided with thermal expansion absorbing means 8 by winding a first insulating sheet 3 around a plurality of uninsulated conductors 2 to insulate between the conductors 2 and bundling them in a laminated state in the vertical direction, and that includes a plurality of joining portions that circulate the second insulating sheet 4 around the winding element 1A and join the first insulating sheet 3 at a portion other than between the conductors, in a stator of a rotary electric machine mounted in a slot 61 of the stator of the winding 1, preferably, the second insulating sheet 4 is cut off at the lower end surface to form an extension piece 5 that protrudes downward such that the first insulating sheet 3 is exposed at the lower end of the winding element 1A, and the extension piece 5 is joined to the inner peripheral wall of an opening 62 of the slot 61.SELECTED DRAWING: Figure 1

Description

Patent Document 1 describes an insulating conductor in which an insulating sheet is wound around a plurality of uninsulated conductors and laminated in the vertical direction, and the insulating sheet is folded in a zigzag shape around the conductors. The stator of a rotary electric machine using the insulating conductor described in Patent Document 1 is shown as a conventional example in FIG. 8 in correspondence with the present invention.

In FIG. 8, the stator of the rotary electric machine folds the insulating sheet 3A into a plurality of uninsulated conductors 2A, 2B, 2C, and 2D in a zigzag shape, winds the insulating sheet 3A in a zigzag manner, and winds the insulating sheet 3A in the vertical direction. A winding is formed by bundling in a laminated state, and this winding is mounted in the slot 61 of the stator 6. However, in the stator of a rotary electric machine using the insulating conductor described in Patent Document 1 for the slot of the rotary electric machine, the insulating sheet 3A folded in a zigzag shape and the insulating sheet 3A that circulates are overlapped with each other to form a conducting wire 2. If the insulating sheet 3A is in close contact with the electric machine, the insulating sheet 3A receives thermal stress due to the heat generated by the rotary electric machine, and the insulating sheet 3A is likely to undergo thermal expansion and break down easily. Therefore, it is necessary to take measures to prevent the dielectric breakdown of the insulating sheet 3A. There is.

Further, Patent Document 2 describes a molded coil in which a conductor is wound into a predetermined shape, an interlayer insulating layer formed by electrodepositing short fibers of a synthetic resin material or an inorganic material on the molded coil, and an interlayer insulating layer. A coil of an electric device composed of a ground insulation formed on the outside after forming an insulating layer is described, and the conductor of the molded coil described in Patent Document 2 is used as an uninsulated conductor wire 2. A stator of a rotary electric machine is shown in FIG. 9 as a conventional example in correspondence with the present invention.

In FIG. 9, the conductor of the coil of an electric device has an adhesive interlayer insulating layer 30A as a winding element in which conductors 2A, 2B, 2C and 2D are bundled in a laminated state, and a ground insulating layer 40A is provided on the interlayer insulating layer 30A. The coil of this electric device is circulated and mounted in the slot 61 of the stator 6 to form the stator of the rotary electric machine. However, in the stator of a rotary electric machine in which the coil of the electric device described in Patent Document 2 is used for the slot of the rotary electric machine, the conductor of the molded coil is bundled in a laminated state by the interlayer insulating layer 30A and the ground insulating layer 40A. Therefore, it is necessary to prevent the interlayer insulating layer 30A and the ground insulating layer 40A from thermally expanding and breaking down due to the heat generated by using the rotary electric machine.

Jikkai Sho 52-37553 (Fig. 4) Japanese Patent Application Laid-Open No. 62-126602 (Fig. 1)

In the present invention, an insulating sheet is wound around a plurality of uninsulated conductors, the conductors are laminated in the vertical direction, and a winding in which adjacent conductors are insulated is mounted in a slot of a rotary electric machine and wound in the slot. To provide a winding and a stator of a rotating electric machine using the winding, which improves the insulation property in the above.

The winding according to claim 1 of the present invention is a thermal expansion absorption means in which a first insulating sheet is wound around a plurality of uninsulated conductors to insulate between the conductors and bundled in a stacked state in the vertical direction. The winding element is provided with a plurality of bonding portions bonded to the first insulating sheet at a portion other than between the conducting wires by rotating the second insulating sheet around the winding element. do. The winding according to claim 2 of the present invention is the winding according to claim 1, in which the first insulating sheet is folded in a zigzag shape around the conducting wire to insulate between the conducting wires in the vertical direction. It is a winding bundled in a laminated state, and the thermal expansion and absorption means is a gap portion in which the conducting wire and the first insulating sheet do not come into contact with each other at a portion other than between the conducting wires. The winding according to claim 3 of the present invention is the winding according to claim 1, in which the first insulating sheet is wound around each of the conducting wires to insulate between the conducting wires and laminated in the vertical direction. The winding is bundled in a bundle, and the thermal expansion and absorption means is a cutting portion in which the conducting wire and the first insulating sheet do not come into contact with each other at a portion other than between the conducting wires. The winding according to claim 4 of the present invention is the winding according to any one of claims 1 to 3, wherein the first insulating sheet is exposed at the lower end of the winding element. The insulating sheet is cut off at the lower end surface to form an extension piece protruding downward. The stator of the rotary electric machine according to claim 5 of the present invention is characterized in that the winding according to claims 1 to 3 is mounted in the slot of the stator. In the stator of the rotary electric machine according to claim 6 of the present invention, the winding according to claim 4 is mounted in the slot of the stator, and the extension piece is joined to the inner peripheral wall of the opening of the slot. It is characterized by that.

A first insulating sheet is wound around a plurality of uninsulated conductors to insulate between the conductors and bundled in a stacked state in the vertical direction to form a winding element provided with thermal expansion absorption means. It is a winding having a plurality of bonding portions bonded to the first insulating sheet at a portion other than between the conducting wires by rotating the second insulating sheet around the element, and the winding is mounted in the slot of the stator. Since it is a stator of a rotary electric machine, it is possible to prevent the first insulating sheet and the second insulating sheet from thermally expanding and breaking down due to the heat generated by using the rotary electric machine. Further, the second insulating sheet is cut off at the lower end surface so that the first insulating sheet is exposed at the lower end of the winding element to form an extension piece protruding downward, and the extension piece opens the slot. Since it is joined to the inner peripheral wall of the part, the insulation of the conductor is composed of two types of insulation sheets, and the material and thickness of the insulation of the conductor can be selected in various ways without blocking the opening of the slot. The insulation distance from the inner peripheral wall of the slot can be secured, and the insulation of the winding in the slot can be improved.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. 2 showing the first embodiment of the stator of the rotary electric machine of the present invention. It is a top view which shows Embodiment 1 of the stator of the rotary electric machine of this invention. FIG. 3A is a cross-sectional view showing a work of forming a winding used in Embodiment 1 of a stator of a rotary electric machine of the present invention, FIG. 3A shows a state of preparation for forming a winding element, and FIG. 3B is a winding. FIG. 3 (c) shows a cross-sectional view of a winding element, FIG. 3 (d) shows a state of forming a winding from a winding element, and FIG. 3 (e) shows a state of forming a wire element. A cross-sectional view of the line is shown. It is sectional drawing which shows the winding frame member used in Embodiment 1 of the stator of the rotary electric machine of this invention. It is sectional drawing which shows Embodiment 2 of the stator of the rotary electric machine of this invention. FIG. 6A is a cross-sectional view showing a work of forming a winding used in the second embodiment of a stator of a rotary electric machine of the present invention, FIG. 6A shows a state in which a winding element is formed, and FIG. 6B shows a winding. A cross-sectional view of the element is shown, FIG. 6 (c) shows a state in which a winding is formed from a winding element, and FIG. 6 (d) shows a cross-sectional view of the winding. It is sectional drawing which shows the winding frame member used in Embodiment 2 of the stator of the rotary electric machine of this invention. It is sectional drawing which shows the conventional example of the stator of a rotary electric machine. It is sectional drawing which shows the other conventional example of the stator of a rotary electric machine.

(Embodiment 1 of stator of rotary electric machine)
1 and 2 show Embodiment 1 of a stator of a rotary electric machine.

In FIGS. 1 and 2, the stator 6 of the rotary electric machine has a plurality of slots 61, and an opening 62 is provided on the lower side (rotor side) of each slot 61, and winding is performed in this slot 61. 1 is attached. In this winding 1, the first insulating sheet 3 is folded in a zigzag shape and wound around a plurality of uninsulated long conductors 2A, 2B, 2C, and 2D in a zigzag manner in the vertical direction. A winding element 1A provided with the thermal expansion absorption means 8 is formed by being bundled in a laminated state, and a second insulating sheet 4 is circulated around the winding element 1A between the conductors (for example, between the conductors 2A-2B and 2B-). It is provided with a plurality of joint portions B to which the first insulating sheet 3 and the second insulating sheet 4 are bonded at a portion other than (between 2C and 2C-2D), and due to heat generated by using a rotary electric machine. It is possible to prevent the first insulating sheet 3 and the second insulating sheet 4 from thermally expanding and breaking down. Further, the winding element 1A is formed with an extension piece 5 having a second insulating sheet 4 cut off at the lower end surface so as to expose the first insulating sheet 3 of the lower conducting wire 2D. .. The winding 1 thus formed is mounted in the slot 61, the second insulating sheet 4 is joined to the inner peripheral wall of the slot 61, and the extension piece 5 is attached to the inner peripheral wall of the opening 62 of the slot 61. Since they are joined, the insulation distance from the inner peripheral wall of the slot 61 can be secured without closing the opening 62 of the slot 61, and the insulation of the winding 2 in the slot 61 can be improved.

The conducting wire 2 is made of an electrically conductive material such as uninsulated copper (containing alloy) or aluminum (containing alloy), and has a flat plate shape, but may be a round wire shape. Further, the number of the conductors 2 is four, and one row is shown in four stages, but four or more stages and two or more rows may be laminated. This stacking direction is described as the vertical direction, but the direction away from the rotor is referred to as the upward direction, and the direction approaching the rotor is referred to as the downward direction. Eye (top) lead wire, second step lead wire, third step lead wire, fourth step (bottom) lead wire, and these are collectively referred to as lead wire 2.

The first insulating sheet 3 is a wound insulating sheet having a thickness of 5 μm to 300 μm, and the material thereof is a material having insulation, heat resistance, flexibility, and impact resistance. Polyphenylene sulfide resin, polyethylene naphthalate resin, polyethylene terephthalate resin, polyester resin, polyamide resin, liquid crystal polymer, and other thermoplastic resins, flexible epoxy resin, polyimide resin, fluororesin, and other thermosetting resins, as well as DuPont products. Examples include aramid paper and foamable resin such as Nomex. Further, the second insulating sheet 4 may be arbitrarily selected regardless of whether the material and the thickness of the first insulating sheet 3 are the same or different.

(Winding used in the first embodiment of the stator of a rotary electric machine)
FIG. 3 shows the winding used in the first embodiment of the stator of the rotary electric machine of the present invention, and FIGS. 3 (a), (b), (c), (d) and (e) form the winding. Indicates the work to be done.

3 (a), (b) and (c) show a winding element, and in FIG. 3 (a), the conductors 2A and 2C and the conductors 2B and 2D of the long uninsulated conductors 2 are shown. The conductors 2A and 2C and the conductors 2B and 2D are arranged via the first insulating sheet 3 in a state where the conductors 2A and 2C are separated from each other in pairs, and the conductors 2B and 2D are adjacent to the conductors 2A and 2C, respectively. By pushing in the direction of the arrow as shown above, the work of winding the first insulating sheet around the conductor 2 is started.

In FIG. 3B, the first insulating sheet 3 has the conductors 2A and 2B, 2B and 2C and so as to insulate between the conductors (for example, between the conductors 2A-2B, 2B-2C and 2C-2D). The first insulating sheet 3 sandwiched between the 2C and the 2D and located on the lower conductor 2D is loosely moved in the direction of the arrow so as not to come into contact with the first insulating sheet 3 in the order of left, upper, right and lower. As shown in FIG. 3C, the thermal expansion and absorption means 8 including the gap portion is formed, and the first insulating sheet 3 is wound around a plurality of uninsulated conductors 2 to form the first insulating sheet 3. The peripheral end A of the insulating sheet 3 is fixed and bundled in a laminated state in the vertical direction to form the winding element 1A.

Next, in FIG. 3D, the second insulating sheet 4 is loosely or firmly circulated around the winding element 1A, and the left side surface, the right side surface, and the upper surface are spotted with the first insulating sheet 3 instead of being fully bonded. A plurality of bonded portions B are provided, the first insulating sheet 3 of the lower conductor 2D is exposed, and the second insulating sheet 4 is cut off at the lower end surface of the winding element 1A to the left and right below. An extension piece 5 that is open and protrudes is formed. The middle portion of the extension piece 5 is pressed in the direction of the arrow, and the extension piece 5 is the first insulating sheet 3 of the lower conductor 2D with the tip of the extension piece 5 protruding downward as shown in FIG. 3 (e). The winding 1 joined to is formed. By mounting the winding 1 on which the extension piece 5 is formed in the slot 61 in this way, it is possible to secure an insulating distance from the inner peripheral wall of the slot 61 without blocking the opening 62 of the slot 61. Insulation in 61 can be improved.

FIG. 4 shows a winding frame member 10 in which a cavity 20 formed of a cavity 20A, 20B, 20C, and 20D having no conductors 2A, 2B, 2C, and 2D of the conductor 2 in FIG. 3 is formed. Since the stator 6 of the rotary electric machine has a plurality of slots 61, although not shown, after mounting the winding frame member 10 in each slot 61, an arbitrary conducting wire 2 is inserted into each cavity 20. It can be used to form an arbitrary connection circuit with the conductor 2 of another slot 61.

(Embodiment 2 of stator of rotary electric machine)
FIG. 5 shows a second embodiment of a stator of a rotary electric machine.

In FIG. 5, the stator 6 of the rotary electric machine has a plurality of slots 61, an opening 62 is provided on the lower side (rotor side) of each slot 61, and the winding 1 is mounted in the slot 61. ing. This winding 1 is wound around the conductors 2A, 2B, 2C, and 2D of the long uninsulated conductor 2 so as to wind the first insulating sheet 30, and is bundled in a laminated state in the vertical direction. A plurality of junctions at a portion other than the winding element 1A provided with the thermal expansion absorbing means 8 and the conductors (for example, between the conductors 2A-2B and 2B-2C and 2C-2D) that circulate around the winding element 1A. The second insulating sheet 40 is cut off at the lower end surface of the winding element 1A so as to have the second insulating sheet 40 joined at the portion B and to expose the first insulating sheet 30 of the lower conductor 2D. The extending piece 5 protruding downward is formed. The winding 1 thus formed is mounted in the slot 61, the second insulating sheet 40 is joined to the inner peripheral wall of the slot 61, and the extension piece 5 is attached to the inner peripheral wall of the opening 62 of the slot 61. It is joined. Also in the second embodiment, similarly to the first embodiment, the heat generated by using the rotary electric machine suppresses the thermal expansion of the first insulating sheet 30 and the second insulating sheet 40 to prevent dielectric breakdown. Can be done. Further, since the extension piece 5 is joined to the inner peripheral wall of the opening 62 of the slot 61, it is possible to secure an insulating distance from the inner peripheral wall of the slot 61 without blocking the opening 62 of the slot 61, and the slot 61. Insulation can be improved.

(Wounding used in the second embodiment of the stator of a rotary electric machine)
FIG. 6 shows a winding used in the second embodiment of the stator of the rotary electric machine of the present invention.

The first insulating sheet 30 used for the winding element 1A has the same material and thickness as the first insulating sheet in the first embodiment, but is not insulated. The first insulating sheet is folded around 2C and 2D in a zigzag shape and wound so as to be wound around the conductors (for example, between the conductors 2A-2B and 2B-2C and between 2C-2D). These are bundled in a stacked state in the vertical direction, and will be described below with reference to FIGS. 6 (a), (b), (c) and (d).

In FIG. 6A, the first insulating sheet 30 is provided with a thermal expansion absorbing means 8 including a cut portion so as not to come into contact with the respective conducting wires 2A, 2B, 2C, and 2D of the long uninsulated conducting wire 2. As shown above, they are wound in a C shape and arranged apart in the vertical direction. In this case, the first insulating sheet 30 is provided with the thermal expansion absorbing means 8 composed of the cut portions alternately in the vertical direction. In this case, although not shown, instead of the cut portion, the first insulating sheet 30 may be wound loosely while having a gap without contacting the outer circumferences of the respective conductors 2A, 2B, 2C, and 2D. good. An adhesive layer 7 is formed on the outer periphery of the first insulating sheet 30, and is pressed from the vertical direction in the arrow direction to form an uninsulated long conductor 2 as shown in FIG. 6 (b). A winding element 1A is formed by winding the first green sheet 30 around each of the conductors 2A, 2B, 2C, and 2D and bundling them in a stacked state in the vertical direction.

Next, in FIG. 6 (c), the winding element 1A is provided with a plurality of bonding portions B in which the second insulating sheet 40 is loosely circulated and spot-bonded on the left side surface and the right side surface instead of full-scale bonding. The first insulating sheet 30 of the lower conductor 2D is exposed, and the winding element 1A is formed by cutting the second insulating sheet 40 at the lower end surface and opening it downward to the left and right to form a protruding piece 5. There is. The middle portion of the extension piece 5 is pressed in the direction of the arrow, and the extension piece 5 is the first insulating sheet 30 of the lower conductor 2D with the tip of the extension piece 5 protruding downward as shown in FIG. 6D. The winding 1 joined to is formed. By mounting the winding 1 on which the extension piece 5 is formed in the slot 61 in this way, the insulation with the inner peripheral wall of the slot 61 is insulated without closing the opening 62 of the slot 61 as in the first embodiment. A distance can be secured and the insulation in the slot 61 can be improved.

FIG. 7 shows a winding frame member 10 in which a cavity 20 formed of a cavity 20A, 20B, 20C, and 20D having no conductors 2A, 2B, 2C, and 2D of the conductor 2 in FIG. 6 is formed. Since the stator 6 of the rotary electric machine has a plurality of slots 61, it is not shown, but as in the first embodiment, after the winding frame member 10 is mounted in each slot 61, it is optional in each cavity 20. Can be used to insert the conductor 2 of the above slot 61 to form an arbitrary connection circuit with the conductor 2 of another slot 61.

The winding of the rotary electric machine of the present invention is useful as a winding to be mounted in a slot of a stator of a rotary electric machine such as a generator or an electric machine.

1 Winding 1A Winding element 2 Conductor 3, 30 First insulating sheet 4, 40 Second insulating sheet 5 Extension piece 6 Stator 61 Slot 62 Opening 8 Thermal expansion absorption means

Claims (6)

A first insulating sheet is wound around a plurality of uninsulated conductors to insulate between the conductors and bundled in a stacked state in the vertical direction to form a winding element provided with thermal expansion absorption means. A winding characterized in that the element is provided with a plurality of bonding portions bonded to the first insulating sheet at a portion other than between the conducting wires by rotating the second insulating sheet. The first insulating sheet is folded in a zigzag shape around the conductors to insulate between the conductors and bundled in a stacked state in the vertical direction. The thermal expansion absorbing means is a portion other than between the conductors. The winding according to claim 1, wherein the winding portion is a gap portion in which the conducting wire and the first insulating sheet do not come into contact with each other. A winding in which the first insulating sheet is wound around each of the conductors to insulate between the conductors and bundled in a stacked state in the vertical direction. The winding according to claim 1, wherein the winding portion is a cut portion in which the conducting wire and the first insulating sheet do not come into contact with each other. Claims 1 to 3 are characterized in that the second insulating sheet is cut off at the lower end surface so as to expose the first insulating sheet at the lower end of the winding element to form an extension piece protruding downward. The winding described in any one of. A stator of a rotary electric machine, wherein the winding according to any one of claims 1 to 3 is mounted in a slot of the stator. A stator of a rotary electric machine, wherein the winding according to claim 4 is mounted in a slot of a stator, and the extension piece is joined to an inner peripheral wall of an opening of the slot.

Images