JP2016129446A - Rotary electric machine stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine stator capable of detecting the excessive temperature rise of each phase coil in a stator coil equipped with a plurality of neutral line members, by one temperature sensor.SOLUTION: A rotary electric machine stator is equipped with a stator core; a stator coil composed of three phase coils wound around teeth of the stator core; and a temperature sensor 34 which detects the temperature of the stator coil. Each phase coil includes a first coil group and a second coil group which are connected with each phase input terminal at one side end portions, . The other side end portions 26U, 26V, and 26W of the first coil group of each phase coil are connected with each other through a first neutral line member 28, and the other side end portions 30U, 30V, and 30W of the second coil group of each phase coil part are connected with each other through a second neutral line member 32. The temperature sensor 34 is disposed while contacting with the first neutral line member 28 and the second neutral line member 32.SELECTED DRAWING: Figure 4

Description

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

  In a rotating electrical machine, when a current flows through an annular coil wound around a stator, heat is generated in the annular coil and the temperature of the annular coil rises. When the temperature of the annular coil rises above a predetermined temperature, for example, a part of the components constituting the stator may be damaged by heat. For this reason, for example, a temperature sensor is brought into contact with a neutral wire connected to the annular coil to detect the temperature of the annular coil, and if the detected temperature exceeds a predetermined temperature, the annular coil wound around the stator is There is a demand for measures to cut off the current to be supplied and prevent the temperature of the annular coil from rising.

  As a technique related to the present invention, for example, in Patent Document 1, a plurality of annular coils wound around the teeth of a stator core and a neutral point connecting member that electrically connects each phase annular coil are contacted. And a temperature sensor for detecting the temperature of the annular coil of each phase through the neutral point connecting member.

JP 2013-219913 A

  By the way, in a stator of a rotating electrical machine having a multi-phase stator coil, each phase stator coil is divided into two groups and connected in parallel, and each group of each phase stator coil is connected via a separate neutral point connecting member. May be electrically connected. Thus, in the configuration of the stator coil including two neutral point connecting members, if the technique described in Patent Document 1 is applied, two temperature sensors are required for each neutral point connecting member, and the cost is reduced. And disadvantageous in terms of assembly.

  The objective of this invention is providing the stator for rotary electric machines which can detect the excessive temperature of each phase coil with the temperature of the stator coil provided with several neutral wire members with one temperature sensor.

  A stator for a rotating electrical machine according to the present invention includes an annular yoke, a stator core having a plurality of teeth protruding in a radial direction at a plurality of locations in the circumferential direction of the yoke, and wound around the teeth of the stator core. A stator for a rotating electrical machine comprising a stator coil composed of three phase coils and a temperature sensor for detecting the temperature of the stator coil, wherein the phase coil portion is connected to each phase input terminal at each one end. Are connected in parallel, and the other end of the first coil group of each phase coil portion is connected to each other via a first neutral wire member, The other end of the second coil group of the coil portion is connected to each other via a second neutral wire member, and the temperature sensor is in contact with the first neutral wire member and the second neutral wire member. Arranged It is intended.

  In the stator for a rotating electrical machine according to the present invention, the first and second neutral wire members are arranged such that circumferential positions thereof overlap and radial positions deviate at a coil end of the stator coil. It may be sandwiched between the first and second neutral wire members.

  In this case, the first and second neutral wire members each include a circumferentially extending portion extending in the circumferential direction of the stator, and the temperature sensor includes a circumferential central portion of the first neutral wire member and the second neutral member. It may be disposed so as to be sandwiched between a central portion in the circumferential direction of the neutral wire member.

  According to the stator for a rotating electrical machine according to the present invention, since the temperature sensor is disposed in contact with the first neutral wire member and the second neutral wire member, each neutral wire member is disposed by one temperature sensor. Thus, an excessive temperature rise of each phase coil can be detected. Thereby, cost reduction and assembly | attachment property improvement can be aimed at.

It is a perspective view which shows the stator for rotary electric machines which is one Embodiment of this invention. It is an expansion perspective view which shows a mode that each coil is wound around the teeth of the some split core which comprises the stator core of the stator shown in FIG. It is a figure which shows roughly the connection state of the stator coil shown in FIG. It is a perspective view which shows two neutral wire members and temperature sensors provided in the stator coil of the stator shown in FIG. It is the elements on larger scale which show another example of arrangement | positioning of the temperature sensor with respect to two middle battle line members.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In this description, specific shapes, materials, numerical values, directions, and the like are examples for facilitating the understanding of the present invention, and can be appropriately changed according to the application, purpose, specification, and the like. In addition, when a plurality of embodiments and modifications are included in the following, it is assumed from the beginning that these characteristic portions are used in appropriate combinations.

  FIG. 1 is a perspective view showing a stator for a rotating electrical machine (hereinafter simply referred to as “stator” as appropriate) 10. The stator 10 has a substantially cylindrical shape, and a rotor (not shown) is rotatably provided via a gap on the inner side of the stator 10 to constitute a rotating electrical machine.

  The stator 10 includes a stator core 12 and a stator coil 14. The stator core 12 includes an annular yoke 16 and a plurality of teeth 18 that project from the yoke 16 in the radial direction. The teeth 18 are formed at a plurality of equally spaced locations in the circumferential direction of the yoke 16.

  FIG. 2 is an enlarged perspective view showing a state in which the coils 20 are wound around the teeth 18 of the plurality of divided cores 17 constituting the stator core 12. The stator core 12 of the present embodiment is configured by arranging a plurality of divided cores 17 in an annular shape. Each divided core 17 is annularly arranged along the circumferential direction of the stator so that the teeth 18 face the radially inner side of the stator 10. Then, each divided core 17 is fastened and fixed by fixing a metal cylindrical member (not shown) to the outer periphery of the plurality of divided cores 17 arranged in an annular shape by, for example, shrink fitting.

  As shown in FIG. 2, a coil 20 is wound around the teeth 18 of the plurality of split cores 17 in a concentrated manner. In the present embodiment, the coil 20 is composed of a rectangular conductive wire made of a metal having excellent conductivity and thermal conductivity, such as a copper wire. In addition, the coil 20 is covered with an insulating member made of an enamel resin or the like made of polyamideimide or the like on the periphery except for both ends. Both end portions of each coil 20 are drawn out as connection terminals 22 to one coil end 19 in the stator axial direction. These connection terminals 22 are used to connect the coils 20 to each other with a bus bar 15 as shown in FIG. 1 or to connect a neutral wire member to be described later.

  In addition, although the stator core 12 of the stator 10 has been described as being configured using a plurality of divided cores 17, it may be configured by other methods. For example, the stator core 12 may be configured by stacking and integrally connecting metal plates such as electromagnetic steel plates punched into an annular shape in the stator axial direction.

  FIG. 3 is a diagram schematically showing a connection state of the stator coil 14 shown in FIG. In FIG. 3, each phase input terminal 24 </ b> U, 24 </ b> V, 24 </ b> W is a terminal that is connected to an inverter (not shown) and inputs / outputs three-phase AC power to / from the stator coil 14.

  The stator 10 of the present embodiment is used in, for example, a three-phase AC synchronous rotating electric machine. Therefore, the stator coil 14 in the present embodiment is configured by three phase coils, a U-phase coil, a V-phase coil, and a W-phase coil. Here, in the present embodiment, an example in which twelve coils 20 are arranged side by side in the circumferential direction and each phase coil is constituted by four coils 20 will be described. Also good. In the following, no. 1-No. The description will be made assuming that the 12 coils 20 are arranged along the circumferential direction of the stator.

  As shown in FIG. 3, the U-phase coil includes a first coil group U1 and a second coil group U2 each having one end connected in parallel to the U-phase input terminal 24U. The first coil group U1 is No. 1 and No. Four coils 20 are connected in series via a bus bar 15 (see FIG. 1). The second coil group U2 is No. 10 and no. Seven coils 20 are connected in series via a bus bar 15.

  The V-phase coil is configured by a first coil group V1 and a second coil group V2 each having one end connected in parallel to the V-phase input terminal 24V. The first coil group V1 is No. 2 and No. Five coils 20 are connected in series via a bus bar 15. The second coil group V2 is No. 11 and no. Eight coils 20 are connected in series via a bus bar 15.

  The W-phase coil is configured by a first coil group W1 and a second coil group W2 each having one end connected in parallel to the W-phase input terminal 24W. The first coil group W1 is No. 3 and no. Six coils 20 are connected in series via a bus bar 15. The second coil group W2 is No. 12 and no. Nine coils 20 are connected in series via a bus bar 15.

  In the present embodiment, an example in which each of the first and second coil groups of each phase coil includes two coils 20 will be described. However, each of the first and second coil groups includes three or more coils. 20 may be comprised.

  The other end portions 26U, 26V, 26W of the first coil groups U1, V1, W1 of the U-phase, V-phase, and W-phase coils are electrically connected to each other by a first neutral wire member 28. Yes. Further, the other end portions 30U, 30V, 30W of the second coil groups U2, V2, W2 of the respective phase coils are electrically connected to each other by a second neutral wire member 32. One temperature sensor 34 is provided in contact with both the first and second neutral wire members 28 and 32.

  FIG. 4 is a perspective view showing two neutral wire members and a temperature sensor provided in the stator coil 14 of the stator 10 shown in FIG. As shown in FIG. 4, the first neutral wire member 28 and the second neutral wire member 32 are disposed at positions where the circumferential positions of the coil end 19 of the stator 10 substantially overlap and the radial positions are shifted. ing.

  Moreover, the 1st and 2nd neutral wire members 28 and 32 are formed with the rectangular conducting wire which coat | covered the insulating members, such as an enamel resin, on the metal conductors, such as a copper wire, for example. And in the 1st and 2nd neutral wire members 28 and 32, the axial direction connected to the other side edge part 26U, 26V, 26W, 30U, 30V, 30W of the 1st and 2nd coil group of each said phase coil About the front-end | tip part of an extending | stretching part, the said insulating member is removed and it is in the state which the metal conductor exposed.

  The first neutral wire member 28 includes an axially extending portion 28a connected to the other end 26U of the first coil group U1 of the U-phase coil, and a circumference that is bent from the axially extending portion 28a and extends in the circumferential direction. A direction extending portion 28b, an axial direction extending portion 28c bent in the axial direction from the circumferential direction extending portion 28b and connected to the other end 26V of the first coil group V1 of the V-phase coil, and the axial direction extending portion 28c. A circumferentially extending portion 28d that bends in the circumferential direction after being folded at the tip of the wire, and further extends in the axial direction from the circumferentially extending portion 28d and extends to the other side of the first coil group W1 of the W-phase coil. And an axially extending portion 28e connected to 26W. Such a first neutral wire member 28 can be formed by bending one rectangular conductive wire. Moreover, each other side edge part 26U, 26V, 26W of 1st coil group U1, V1, W1 of each phase coil and each axial direction extension part 28a, 28c, 28e of the 1st neutral wire member 28 are TIG, for example. Each is connected by welding such as welding.

  The second neutral wire member 32 includes an axially extending portion 32a connected to the other end 30U of the second coil group U2 of the U-phase coil, and a circumference that is bent from the axially extending portion 32a and extends in the circumferential direction. A direction extending portion 32b, an axial extending portion 32c bent in the axial direction from the circumferential extending portion 32b and connected to the other end 30V of the second coil group V2 of the V-phase coil, and the axial extending portion 32c A circumferentially extending portion 32d that bends at the tip of the wire and then bends in the circumferential direction and further extends, and once bent back into a U shape from the circumferentially extending portion 32d and then bent and stretched in the axial direction, the second of the W-phase coil. And an axially extending portion 32e connected to the other end 30W of the coil group W2. Such a second neutral wire member 32 can also be formed by bending a single rectangular conducting wire. Moreover, each other side edge part 30U, 30V, 30W of 2nd coil group U2, V2, W2 of each phase coil and each axial direction extension part 32a, 32c, 32e of the 2nd neutral wire member 32 are TIG, for example. Each is connected by welding such as welding.

  The temperature sensor 34 is disposed in contact with both the first neutral wire member 28 and the second neutral wire member 32. For the temperature sensor 34, for example, a thermistor can be suitably used. In the present embodiment, the temperature sensor 34 is sandwiched and held between the circumferentially extending portion 28 d of the first neutral wire member 28 and the circumferentially extending portion 32 b of the second neutral wire member 32.

  The temperature sensor 34 may be secured to the first and second neutral wire members 28 and 32 by covering the periphery of the temperature sensor 34 with a resin mold. Alternatively, the first and second neutral wire members 28, 32 are bonded and fixed to the first and second neutral wire members 28, 32 with the adhesive of the temperature sensor 34, or a tape or thread is wound around the temperature sensor 34. You may fix to 32.

  In this way, the first and second neutral wire members 28 and 32 and the temperature sensor 34 are included by fixing the first and second neutral wire members 28 and 32 integrally with the temperature sensor 34 interposed therebetween. The natural vibration frequency of the structure is increased. As a result, when the rotating electrical machine in which the stator 10 is incorporated is driven and the rotor rotates, the first and second neutral wire members 28 are less likely to vibrate, and the generation of noise can be suppressed. In addition, as described below, by fixing the central portions of the first neutral wire member 28 and the second neutral wire member 32 via the temperature sensor 34, it is possible to suppress the portion where the amplitude is increased and to be more effective. It is.

  Furthermore, it is preferable that the temperature sensor 34 is fixed in contact between the central portion of the first neutral wire member 28 and the central portion of the second neutral wire member 32 in the circumferential direction of the stator. By arranging the temperature sensor 34 at such a position, the other end portions 26U, 26V, 26W, 30U of the first and second coil groups U1, U2, V1, V2, W1, W2 of the respective phase coils are provided. Since the heat transfer resistances up to 30V and 30W are substantially equal, the temperature detection sensitivities when the first and second coil groups U1, U2, V1, V2, W1, and W2 are excessively heated are made equal. it can.

  As described above, according to the stator 10 for a rotating electrical machine of the present embodiment, each phase coil is constituted by the first and second coil groups, and the first coil groups U1, V1, W1 of each phase coil are the first. In the stator coil 14 connected to each other by the neutral wire member 28, and the second coil groups U2, V2, W2 of the respective phase coils are connected to each other by the second neutral wire member 32, one temperature sensor 34 is connected to the first and second temperature sensors 34. The second neutral wire members 28 and 32 are disposed in contact with each other. Thereby, the excessive temperature rise of each phase coil can be detected by the single temperature sensor 34 via the first and second neutral wire members 28 and 32. In this case, since the temperature sensor 34 is disposed in contact with both the first and second neutral wire members 28 and 32, the temperature of the neutral wire member that is one of the higher temperatures is detected. There is no problem as long as it is possible to detect a state in which excessive temperature rise has occurred in the coil group. Thus, the temperature of each phase coil can be detected by the single temperature sensor 34 via the two neutral wire members 28 and 32, so that the cost of the stator 10 can be reduced and the assemblability can be improved.

  It should be noted that the present invention is not limited to the above-described embodiments and modifications thereof, and various modifications and improvements can be made within the matters described in the claims of the present application and the equivalent scope thereof.

  For example, in the above description, the temperature sensor 34 is interposed between the circumferentially extending portion 28d of the first neutral wire member 28 and the circumferentially extending portion 32b of the second neutral wire member 32, but this is not limitative. Is not to be done. As shown in FIG. 5, the axially extending portion 28c of the first neutral wire member 28 and the axially extending portion 32c of the second neutral wire member 32 are arranged side by side in the circumferential direction of the stator, and each axially extending portion 28c. , 32c, and the temperature sensor 34 may be sandwiched.

  10 Stator for Rotating Electric Machine, 12 Stator Core, 14 Stator Coil, 15 Bus Bar, 16 Yoke, 17 Divided Core, 18 Teeth, 19 Coil End, 20 Coil, 22 Connection Terminal, 24U U Phase Input Terminal, 24V V Phase Input Terminal, 24W W-phase input terminal, 26U, 26V, 26W (the first coil group) on the other end, 30U, 30V, 30W (the second coil group) on the other end, 28 first neutral wire members, 28a, 28c , 28e, 32a, 32c, 32e Axial extension part, 28b, 28d, 32b, 32d Circumferential extension part, 32 Second neutral wire member, 34 Temperature sensor, U1, V1, W1 (for each phase coil) Coil group, U2, V2, W2 (second phase coil) second coil group.

Claims (3)

An annular yoke, and a stator core having a plurality of teeth provided projecting radially at a plurality of locations in the circumferential direction of the yoke;
A stator coil comprising three phase coils wound around the teeth of the stator core;
A temperature sensor for detecting the temperature of the stator coil;
A stator for a rotating electrical machine comprising:
The phase coil portion includes a first coil group and a second coil group, each of which is connected in parallel to each phase input terminal, and the other end portion of the first coil group of each phase coil portion is The other side ends of the second coil group of each phase coil portion are connected to each other via a second neutral wire member, and the temperature sensor is connected to the first neutral wire member. Arranged in contact with the sex wire member and the second neutral wire member,
Stator for rotating electrical machines. The stator for a rotating electrical machine according to claim 1,
The first and second neutral wire members are arranged such that circumferential positions thereof overlap and radial positions deviate at a coil end of the stator coil, and the temperature sensor includes the first and second neutral wire members. A stator for a rotating electrical machine that is sandwiched between the stators. The stator for a rotating electrical machine according to claim 2,
The first and second neutral wire members each include a circumferentially extending portion extending in the circumferential direction of the stator, and the temperature sensor includes a central portion in the circumferential direction of the first neutral wire member and the second neutral wire. A stator for a rotating electrical machine that is sandwiched and disposed between a central portion in a circumferential direction of a member.

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