WO2014188588A1

WO2014188588A1 - Rotating electric machine stator

Info

Publication number: WO2014188588A1
Application number: PCT/JP2013/064492
Authority: WO
Inventors: 祐輔磯野
Original assignee: 三菱電機株式会社
Priority date: 2013-05-24
Filing date: 2013-05-24
Publication date: 2014-11-27

Abstract

The purpose of this invention is to obtain a rotating electric machine stator capable of improving an anti-surge property without using a coated conductive wire to which an anti-surge property is imparted, in such a way that an insulating tube is mounted on the root side of a portion extending from a first turn which is the winding start of a first coil on the input side of each phase winding constituted by concentrated winding coils. The rotating electric machine stator according to the invention comprises: a stator core having a ring-shaped yoke and a plurality of teeth each projecting from the inner circumferential surface of the yoke toward a diameter direction inner side and arranged in a circumferential direction; and a stator coil constituted by a three-phase AC connection of concentrated winding coils that are fabricated by winding a coated conductive wire around each of the teeth. In the rotating electric machine stator, an insulating tube is mounted on the root side of a portion extending from a first turn which is the winding start of the first concentrated winding coil from the input side of each of the phase windings of the stator coil. The insulating tube is disposed at the intersection of the portion extending from the first turn which is the winding start of the first concentrated winding coil and a portion extending from the final turn.

Description

Rotating electric machine stator

The present invention relates to a stator of a rotating electric machine such as an electric motor or a generator.

Non-Patent Document 1 reports that when a motor is driven by an inverter power supply, a high voltage is generated between winding turns of the motor due to a steep surge voltage generated by the inverter. In Non-Patent Document 1, as a countermeasure on the rotating electrical machine side against the inverter surge, increase the thickness of the insulating coating of the insulated wire used for the winding or use an insulated wire excellent in corona resistance. Was mentioned.
However, such measures for imparting surge resistance to the winding have problems such as a reduction in winding space and an increase in cost.

In view of such a situation, in a conventional three-phase AC motor provided with a distributed winding and a stator in which the windings of each of the phases wound in layers are Y-connected, a coil produced by winding a coated conductor around a winding frame is used. From the aspect of the manufacturing process that can be inserted into the stator core, and from the aspect of the stator structure that there is a relatively large winding space even after coil insertion, the first turn at the beginning of winding of the first coil on the input side of each phase winding The outer surface of the covered conductive wire is covered with an insulating member, and the distance between the covered conductive wire of the first turn and the covered conductive wire of the remaining turns is increased to improve surge resistance between turns (for example, see Patent Document 1). ).

JP 2012-120405 A

However, the surge protection in the conventional three-phase AC motor is a measure taken from the advantages of the above-described manufacturing process and stator structure by using distributed winding and lap winding, and the winding space is limited. It could not be applied to a stator using concentrated winding coils.

Therefore, the applicant of the present invention has the largest potential difference between the coated conductor of the first turn at the beginning of winding and the coated conductor of the final turn in the concentrated winding coil produced by winding the coated conductor in a multi-layered multiple row around the teeth. When a surge voltage occurs, partial discharge occurs at the intersection of the extension from the first turn at the beginning of winding of the first coil on the input side and the extension from the last turn, resulting in insulation deterioration. As a result, the present invention was invented.

The present invention has been made to solve the above-described problem, and is provided on the root side of the extending portion from the first turn of the first coil on the input side of each phase winding constituted by concentrated winding coils. An object of the present invention is to obtain a stator for a rotating electrical machine that can be improved in surge resistance without using an insulated tube and using a coated conductor wire with surge resistance.

A stator for a rotating electrical machine according to the present invention includes an annular yoke, a stator core having a plurality of teeth extending radially inward from the inner peripheral surface of the yoke, respectively, and a coated conductor. A stator coil formed by winding three-phase AC connections of concentrated winding coils that are wound around each of a plurality of teeth, and an insulating tube is first from the input side of each phase winding of the stator coil The first concentrated winding coil is attached to the base side of the extension portion from the first turn of the winding start, the extension portion from the first turn of the first concentrated winding coil and the extension from the last turn. It is arranged at the intersection with the exit.

According to the present invention, when a surge voltage is generated, at the intersection of the extension portion from the first turn and the extension portion from the last turn of the first concentrated winding coil where the potential difference becomes the largest. Since the insulating tube is disposed, the insulation distance between the extended portion from the first turn and the extended portion from the final turn becomes long. Therefore, even if a surge voltage is generated, the occurrence of partial discharge at the intersection of the extended portion from the first turn and the extended portion from the last turn is suppressed. Thereby, it is not necessary to use a coated conductor wire with surge resistance, and surge resistance can be improved at a low cost, and the winding space can be increased and the space factor can be increased.

It is an end elevation which shows the stator of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a partially broken enlarged view of the A part of FIG. It is a connection diagram of the stator coil of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows the concentrated winding coil by the side of the input in the stator of the rotary electric machine which concerns on Embodiment 1 of this invention. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4. It is a schematic diagram explaining the connection state of the concentrated winding coil in the stator of the rotary electric machine which concerns on Embodiment 1 of this invention.

Hereinafter, preferred embodiments of a stator for a rotating electrical machine according to the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
1 is an end view showing a stator of a rotary electric machine according to Embodiment 1 of the present invention, FIG. 2 is a partially broken enlarged view of part A of FIG. 1, and FIG. 3 is a rotary electric machine according to Embodiment 1 of the present invention. FIG. 4 is a schematic diagram showing a concentrated winding coil on the input side in the stator of the rotary electric machine according to Embodiment 1 of the present invention. FIG. 5 is a cross-sectional view taken along line VV in FIG. 6 is a schematic diagram illustrating a connection state of concentrated winding coils in the stator of the rotary electric machine according to Embodiment 1 of the present invention.

1 and 2, a stator 1 includes an annular stator core 2, a stator coil 5 attached to the stator core 2, and a U-phase lead-out wire disposed in the circumferential direction on one axial end side of the stator core 2. 10, V-phase lead-out wire 11, W-phase lead-out wire 12 and neutral-point connection wire 13, U-phase lead-out wire 10, V-phase lead-out wire 11, W-phase lead-out wire 12 and neutral-point connection And a pressing plate 17 that prevents the electric wire 13 from floating.

The U-phase lead-out wire 10, the V-phase lead-out wire 11, the W-phase lead-out wire 12 and the neutral-point connection wire 13 are respectively a copper wire or an aluminum wire that is insulation-coated with enamel resin or the like.

The stator core 2 is formed by, for example, laminating and integrating electromagnetic steel plates, and has 72 annular yokes 3 and 72 arranged radially at an equiangular pitch in the circumferential direction protruding from the inner peripheral wall surface of the yoke 3. The teeth 4 are provided.

As shown in FIG. 4, the stator coil 5 is produced by, for example, winding a coated conductive wire 7 made of copper wire, aluminum wire, or the like that is insulation-coated with enamel resin around each of the teeth 4 in a multi-layered multiple row 72. One concentrated winding coil 6 is provided. The 72 concentrated winding coils 6 are arranged 12 times in the circumferential direction in the order of U phase, U phase, V phase, V phase, W phase, and W phase. An insulator 8 is inserted between the tooth 4 and the concentrated winding coil 6.

In one concentrated winding coil 6 adjacent to the concentrated winding coil 6, an insulating tube 15 made of an insulating resin such as polyimide resin is wound around the teeth 4 in a multi-layered multiple row around the teeth 4 as shown in FIG. 4. Is mounted on the base side of the extended portion from the first turn at the beginning of winding of the winding portion configured as described above. Further, for example, a protective tube 16 made of glass epoxy resin is attached to the extending portion from the first turn so as to cover at least a part of the insulating tube 15 and reach the connection portion 18 (not shown). . Therefore, as shown in FIG. 5, the insulating tube 15 is wound with the extension portion from the first turn at the start of winding of the winding portion formed by winding the coated conductor 7 around the teeth 4 in a multi-layered manner. The first turn at the end, that is, at the intersection with the extension from the last turn. Thereby, the extension part from the 1st turn and the extension part from the last turn are separated.

Moreover, in the other concentrated winding coil 6 of the adjacent concentrated winding coil 6, as shown in FIG. 6, the winding part comprised by winding the covering conducting wire 7 around the teeth 4 in the multilayer multi-row. It is mounted so as to reach the connection part 18 from the base side of the extension part from the last turn.

As shown in FIG. 6, the adjacent concentrated winding coil 6 is electrically connected to the extension portion of the first turn at the beginning of winding of the other concentrated winding coil 6. Connected in series. And the extension part from the 1st turn of the winding start of one concentrated winding coil 6 is connected to the U-phase lead-out electric wire 10, and the extension part from the last turn of the other concentrated winding coil 6 is a neutral point connection. Wired to the service wire 13. Here, the extension portion from the first turn at the beginning of winding of one concentrated winding coil 6 is not shown, but the insulating coating on the tip side is peeled off, and the insulating coating peeling portion of the U-phase lead-out wire 10 is removed. Along the sleeve, the sleeve is put on, and it is caulked and fixed together with the sleeve, and is connected to the U-phase lead-out electric wire 10. Further, the insulating tape 14 is wound around the connecting portion 18 to ensure electrical insulation. In addition, the extension part from the last turn of the other concentrated winding coil 6 is similarly connected to the electric wire 13 for neutral point connection.

The U-phase winding 20 is configured by connecting twelve coil groups formed by connecting two adjacent U-phase concentrated winding coils 6 in series in parallel. Similarly, each of the V-phase windings 21 is configured by connecting in parallel twelve coil groups formed by connecting two adjacent U-phase concentrated winding coils 6 in series. Reference numeral 22 denotes a configuration in which twelve coil groups formed by connecting two adjacent U-phase concentrated winding coils 6 in series are connected in parallel. As shown in FIG. 3, the stator coil 5 has a U-phase winding 20, a V-phase winding 21 and a W-phase winding 22 that are configured in this manner connected in a Y-direction that is one of three-phase AC connections. Composed.

Here, the U-phase concentrated winding coil 6 connected to the U-phase lead-out wire 10 becomes the first coil on the input side of the U-phase winding 20. Further, the V-phase concentrated winding coil 6 connected to the V-phase lead-out wire 11 serves as the first coil on the input side of the V-phase winding 21. Furthermore, the W-phase concentrated winding coil 6 connected to the W-phase lead-out wire 12 serves as the first coil on the input side of the W-phase winding 22. The U-phase, V-phase, and W-phase concentrated winding coils 6 connected to the neutral point connection wire 13 are the final coils of the U-phase winding 20, the V-phase winding 21, and the W-phase winding 22.

The stator 1 manufactured in this manner is disposed so as to surround the rotor on the outer peripheral side of the rotor rotatably disposed in the frame, and the three-phase AC power converted by the inverter is used as the U-phase lead wire. 10, supplied to the V-phase lead wire 11 and the W-phase lead wire 12 to operate as a three-phase AC motor.

Here, since the concentrated winding coil 6 is configured by closely winding the coated conducting wire 7 around the teeth 4, the extending portion from the first turn at the beginning of winding and the extending portion from the final turn are in contact with each other. Or they are close. Further, the potential difference between the first turn at the start of winding and the final turn becomes the highest. Therefore, when a surge voltage is generated in the inverter, the input terminal voltage of the stator coil 5, that is, the potential of the first turn of the first coil on the input side of the U-phase winding 20, V-phase winding 21 and W-phase winding 22 is set. Get higher. As a result, the potential difference between the extended portion from the first turn and the extended portion from the last turn in the first coil on the input side of the U-phase winding 20, V-phase winding 21 and W-phase winding 22 is It becomes the largest, and a partial discharge occurs at the intersection. In the worst case, dielectric breakdown occurs.

In the first embodiment, the insulating tube 15 is on the root side of the extension from the first turn of the first coil on the input side of the U-phase winding 20, V-phase winding 21 and W-phase winding 22. The first coil is disposed at the intersection of the extension from the first turn and the extension from the last turn. Therefore, even if a surge voltage is generated in the inverter and the potential of the first turn of the first coil increases, the extension from the first turn at the beginning of winding of the first coil and the extension from the last turn Generation of partial discharge at the intersection can be suppressed and insulation deterioration can be prevented.

Therefore, according to the first embodiment, since it is not necessary to use a coated conductor with surge resistance, the surge resistance can be improved at a low cost, and the winding space is increased, and the space factor is increased. Can be increased.

Further, the protective tube 16 reaches the connection portion 18 to the extension portion from the first turn of the first coil on the input side of the U-phase winding 20, the V-phase winding 21 and the W-phase winding 22. Since it is mounted, the occurrence of damage to the insulating coating due to the external force acting on the portion of the coated conductor 7 extending from the first turn at the start of winding of the first coil is suppressed, and excellent electrical insulation is obtained. It is done. Further, since the protective tube 16 is attached to the extending portion from the first turn so as to cover the connection portion 18 side of the insulating tube 15, the portion of the covered conducting wire 7 extending from the first turn is exposed to the outside. Therefore, the occurrence of damage to the insulating film due to external force is suppressed.

Here, when the insulating tube 15 protrudes from the protective tube 16 to the connection portion 18 side with the U-phase, V-phase, and W-phase lead-out

wires

10, 11, and 12, the U-phase winding 20 and the V-phase winding 21. When connecting the extended portion from the first turn of the first coil on the input side of the W-phase winding 22 to the U-phase, V-phase and W-

phase lead wires

10, 11, 12 However, there is a risk of touching the insulating tube 15 and pulling it toward the connecting portion 18 side to expose the root side of the extending portion from the first turn. And if the base side of the extension part from a 1st turn is exposed, the extension part from the 1st turn and extension part from the last turn of a 1st coil will contact, and surge resistance will deteriorate.

In the first embodiment, since the insulating tube 15 does not protrude from the protective tube 16 to the connection portion 18 side with the U-phase, V-phase, and W-phase lead-out

wires

10, 11, 12, the operator pulls the insulating tube 15. It is possible to avoid the occurrence of such a situation that it is touched and pulled toward the connecting portion 18 to expose the base side of the extending portion from the first turn.

Further, since the protective tube 16 is mounted so as to reach the connection portion 18 from the base side of the extension portion from the last turn of the concentrated winding coil 6 connected to the neutral point connection wire 13, from the last turn The portion of the coated conductor 7 that extends is not exposed to the outside, and the occurrence of damage to the insulating coating due to external force is suppressed.

Here, in the assembly process of the stator 1, the insulating tube 15 is a color different from the colors of the coated conductor 7 and the protective tube 16 in each phase so that the mounting of the insulating tube 15 can be forgotten or the mounting position can be easily visually confirmed. Is desirable. In particular, the insulation tube 15 can be easily identified by setting the color of the insulation tube 15 to be 120 degrees or more away from the color of the coated conductor 7 and the protection tube 16 on the hue scale.
Further, the colors of the insulating tube 15 and the protective tube 16 may be changed for each phase or the same.

In the first embodiment, a stator core having 72 teeth is used, but the number of teeth of the stator core is not limited to 72.
In the first embodiment, twelve coil groups in which two concentrated winding coils are connected in series are connected in parallel to form a phase winding, but the phase winding has four concentrated winding coils. Six coil groups connected in series may be connected in parallel, or 24 concentrated winding coils may be connected in series.

In the first embodiment, the protective tube is provided at the extension portion from the first turn of the first coil and the extension portion from the last turn of the final coil of the U-phase winding, V-phase winding and W-phase winding. However, you may attach a protection tube to the extension part from the 1st turn and the last turn of all the concentrated winding coils.

In the first embodiment, the stator coil is configured by connecting the U-phase winding, the V-phase winding, and the W-phase winding to the Y connection that is one of the three-phase AC connections. The U-phase winding, V-phase winding, and W-phase winding may be configured by other three-phase AC connections, for example, Δ connections. In this case, since the connection portions of the U-phase winding, V-phase winding and W-phase winding that are Δ-connected serve as input ends, the winding start of the first coil (concentrated winding coil) located on each input end side is started. What is necessary is just to attach an insulating tube to the base side of the extension part from the 1st turn.

In the first embodiment, the case where the stator is applied to an electric motor has been described. However, the stator may be applied not only to the electric motor but also to a rotating electric machine such as a generator or a motor generator.

Claims

An annular yoke, and a stator core having a plurality of teeth each extending radially inward from the inner circumferential surface of the yoke and arranged in the circumferential direction;
In a stator of a rotating electrical machine comprising: a stator coil configured by three-phase alternating current connection of concentrated winding coils produced by winding a coated conductor around each of the plurality of teeth;
An insulating tube is mounted on the base side of the extension from the first turn of the first concentrated winding coil from the input side of each phase winding of the stator coil, and the first concentrated winding coil A stator for a rotating electrical machine, wherein the stator is disposed at an intersection between an extension portion from the first turn at the start of winding and an extension portion from the last turn.
The stator for a rotating electrical machine according to claim 1, wherein a protective tube is attached to an extension portion from the first turn of the first concentrated winding coil.
3. The protection tube is attached to an extension portion from the first turn at the beginning of winding of the first concentrated winding coil so as to cover at least a part of the insulating tube. The stator of a rotating electrical machine.
The said insulation tube is not extended from the said protection tube to the opposite side to the base side of the extension part from the 1st turn of the winding start of the said 1st concentrated winding coil, The characterized by the above-mentioned. A stator for rotating electrical machines.
The color of the insulating tube is the color of the coated conductor and the color of the protective tube attached to the extension from the first turn of the first concentrated coil to which the insulating tube is attached. The stator for a rotating electrical machine according to any one of claims 2 to 4, wherein the stator is different from the stator.