JP2008136324A - Stator of rotary electric machine and rotary electric machine equipped with stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator of a rotary electric machine capable of precisely measuring the temperature of a coil without damaging the coil, and a rotary electric machine equipped with the stator. <P>SOLUTION: The rotary electric machine 100 includes: an annular stator 61; a coil 40 wound around the stator teeth formed on the stator core 61; a resin part 65 capable of fixing the coil to the stator core 61 by molding the coil 40; a hole part 90 formed in the resin part 65; and a temperature sensor 70 inserted into the hole part 90 and supported by the inner surface of the resin part 65 defining the hole part 90. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a stator for a rotating electrical machine and a rotating electrical machine, and more particularly to a stator having a temperature sensor.

  Rotating electric machines such as motors and generators are incorporated in driving devices for hybrid vehicles and electric vehicles. In such a rotating electrical machine, the winding generates heat due to iron loss and resistance. In order to prevent the winding from being burned by this heat generation, the temperature of the winding is detected by a temperature sensor.

  For example, as a rotating electrical machine provided with a temperature sensor, for example, there is a rotating electrical machine described in JP-A-2005-86882. According to this rotating electrical machine, the temperature of the rotating electrical machine is detected by the temperature sensor arranged at the coil end portion of the stator.

  Moreover, according to the electric motor described in Japanese Patent Application Laid-Open No. 2003-92858, the temperature is measured by a temperature detection element provided in a tunnel-like gap at the coil end portion of the winding.

  The permanent magnet motor described in Japanese Patent Application Laid-Open No. 2001-128414 includes a housing that is housed in a rotor and a stator, and a temperature sensor mounted on the housing, and measures the temperature in the housing with the temperature sensor. ing.

An electric motor described in Japanese Patent Laid-Open No. 10-94222 includes a rotor, a stator, a front housing and a rear housing provided at an end of the stator, and a temperature sensor inserted in a guide hole formed in the rear housing. I have. There is a gap between the coil end and the rear housing, and a temperature sensor is arranged in this gap to measure the temperature.
JP 2005-86882 A JP 2003-92858 A JP 2001-128414 A JP-A-10-94222

  However, in the rotating electrical machine described in Japanese Patent Application Laid-Open No. 2005-86882, the temperature sensor fixing method is not specifically described, and the temperature sensor may be misaligned depending on the temperature sensor fixing means. May not be measured.

  In the rotating electrical machine described in Japanese Patent Application Laid-Open No. 2003-92858, since the temperature sensor is hooked on the coil, the coil may be damaged by the temperature sensor.

  In the permanent magnet motor described in Japanese Patent Laid-Open No. 2001-128414, the temperature sensor measures the temperature in the housing and cannot detect the temperature of the coil.

  In Japanese Patent Laid-Open No. 10-94222, since the temperature sensor is disposed in the gap, the temperature sensor is likely to be displaced, and there is a possibility that the temperature of the coil cannot be measured accurately.

  The present invention has been made in view of the problems as described above, and an object of the present invention is to provide a stator for a rotating electrical machine that can accurately measure the temperature of the coil and that does not damage the coil, and a rotation provided with the stator. It is to provide an electric machine.

  The rotating electrical machine according to the present invention includes an annular stator core, a coil wound around stator teeth formed on the stator core, and a resin portion that can mold the coil and fix the coil to the stator core. And the hole part formed in the resin part and the temperature sensor inserted in the hole part and supported by the inner surface of the resin part which prescribes | regulates this hole part are provided.

  Preferably, the resin portion includes an end portion for molding a coil end portion of a coil located on the axial end portion side of the stator core, and the hole portion is formed in the end portion. Preferably, the hole includes a first taper portion in which the insertion area of the temperature sensor decreases from the outer peripheral surface side to the inner peripheral surface side of the stator core. The temperature sensor includes a second tapered portion that extends along the first tapered portion. Preferably, the hole extends along the radial direction of the stator core. Preferably, the resin part includes a first engagement part formed around the hole part. The temperature sensor includes a second engagement portion that engages with the first engagement portion. Preferably, a plurality of coils are arranged along the inner peripheral surface of the stator core, and the hole is formed in a resin portion located between coils adjacent in the circumferential direction. Preferably, the apparatus further includes a discharge unit that discharges the gas in the hole part from the hole part as the temperature sensor enters the hole part. A rotating electrical machine according to the present invention includes the stator.

  According to the stator core and the rotating electric machine including the stator core according to the present invention, by supporting the temperature sensor on the inner peripheral surface that defines the hole portion, it is possible to suppress the positional deviation of the temperature sensor and accurately detect the temperature of the coil. Detection can be performed and the risk of damage to the coil is small.

  Embodiments according to the present invention will be described with reference to FIGS. The rotating electrical machine of the following embodiment is used in various devices such as hybrid vehicles, various vehicles other than hybrid vehicles (for example, electric vehicles including fuel cell vehicles and electric vehicles), industrial equipment, air conditioning equipment, and environmental equipment. The present invention is also applicable to a rotating electrical machine that is mounted.

  In the following embodiments, the same or corresponding parts are denoted by the same reference numerals. Furthermore, it is also planned from the beginning that not all of the constituent elements of each embodiment are essential, and some constituent elements may be omitted.

  FIG. 1 is a side view of a rotating electrical machine 100 according to the present embodiment, and FIG. 2 is a side sectional view taken along line II-II shown in FIG. FIG. 3 is a plan view of the stator core.

  As shown in the example shown in FIG. 2, the rotating electrical machine 100 includes an annular stator 60, a rotating shaft 30 that extends on the central axis of the stator 60 and is rotatably supported, and is fixed to the rotating shaft 30. Rotor 20. The rotor 20 includes, for example, a rotor core 22 formed by laminating a plurality of electromagnetic steel plates, and a permanent magnet 21 formed in the rotor core 22 and accommodated in a hole 20A extending in the axial direction. Note that, as in the example shown in FIG. 2, not only the IPM (Interior Permanent Magnet), but also an SPM (Surface Permanent Magnet) may be used.

  The stator 60 includes an annular stator core 61, a plurality of coils 40 provided on the inner peripheral surface side of the stator core 61 along the circumferential direction, and a mold resin 65 that molds the coils 40 and fixes the coils 40 to the stator core 61. And.

  In the example shown in FIG. 3, the stator core 61 is configured by laminating a plurality of electromagnetic steel plates in the axial direction. The stator core 61 includes a stator tooth 61 </ b> A that is formed on the inner peripheral surface 62 and protrudes radially inward, and a plurality of fixing holes 67 for fixing the stator core 61. A plurality of stator teeth 61A are formed at intervals in the circumferential direction of the stator core 61, and slots (concave portions) 64 are formed between the stator teeth 61A.

  Note that the stator core 61 may be formed of a plurality of annularly arranged stator cores. In this case, as a method of annularly fixing the divided stator cores, a method of adhering the tips of the stator teeth formed on the respective divided stator cores to the outer peripheral surface of the resin component of the annular member can be considered. Further, the stator core 61 may be an assembled divided stator core formed by arranging a plurality of divided stator cores in an annular shape and fixing the annularly arranged divided stator cores with an annular fixing member by a technique such as shrink fitting. Good.

  In FIG. 2, the coil 40 is formed by winding an enameled wire or the like around an insulating insulator, and then mounting a coil that is modularized using a mold resin on the stator teeth 61 </ b> A. The coil 40 may be formed by winding an enamel wire or the like directly around the stator teeth 61A.

  The mold resin 65 fixes the coil 40 to the stator core 61. For example, thermosetting resin such as BMC (Bulk Molding Compound) and epoxy resin, thermoplastic resin such as PPS (Polyphenylene Sulfide) and PBT (Polybutylene Terephthalate), etc. It is composed of The mold resin 65 is directly formed on the surface of the coil 40 and is formed (molded) so as to imitate the surface shape of each coil 40.

  That is, there is no gap between the surface of each coil 40 and the mold resin 65, and the heat from each coil 40 is directly transferred to the mold resin 65.

  A hole 90 is formed in such a mold resin 65, and a temperature sensor 70 that is in direct contact with the inner surface of the mold resin 65 that defines the hole 90 is inserted into the hole 90.

  Thus, by measuring the temperature of the mold resin 65 to which heat from the coil 40 is directly transmitted, the temperature of the coil 40 can be accurately detected.

  As shown in FIGS. 1 and 2, the mold resin 65 includes an end portion 65A for molding the coil end 40A of the coil 40 located at the axial end portion of the stator core 61, and a hole portion 90 is formed in the end portion 65A. And the temperature sensor 70 is inserted.

  The coil end 40 </ b> A is likely to generate heat and easily reach a high temperature, and the portion is more likely to deteriorate than the other portions. Therefore, the temperature sensor 70 is inserted into the end portion 65A for molding the coil end 40A, and the temperature of the portion is measured, thereby measuring the temperature of the high temperature portion in the stator 60.

  In particular, the hole 90 and the temperature sensor 70 are provided in the mold resin 65 filled between the coil ends 40 </ b> A of the coils 40 adjacent in the circumferential direction of the stator core 61. The mold resin 65 filled between the coil ends 40 </ b> A is transmitted with heat from two adjacent coil ends 40 </ b> A, and the temperature is most likely to be highest in the mold resin 65. Therefore, by arranging the temperature sensor 70 at the position, it is possible to measure the temperature of the portion where the temperature is most likely to rise in the stator 60.

  4 is a cross-sectional view for explaining the temperature sensor 70 and the hole 90, and FIG. 5 is a cross-sectional view taken along the line VV in FIG. As shown in the example shown in FIG. 4, the temperature sensor 70 includes a body portion 79 having a long shell shape and a head portion 74 formed at one end of the body portion 79. The peripheral surface 70A of the body portion 79 is in contact with the inner peripheral surface 90A of the mold resin 65 that defines the hole 90, and the temperature sensor 70 is supported by the inner peripheral surface 90A.

  For this reason, the temperature sensor 70 inserted into the hole 90 can suppress the displacement, and the temperature can be accurately detected.

  The opening 98 of the hole 90 is formed on the outer peripheral surface of the mold resin 65 located on the radially outer side of the stator core 61 shown in FIG. 2, and the hole 90 is inward from the outer peripheral surface 63 side of the stator core 61. It extends toward the peripheral surface 62 side. Thus, since the hole part 90 and the temperature sensor 70 are arrange | positioned along the radial direction of the stator core 61, it can suppress that the length of the axial direction of the stator core 61 becomes long.

  In FIG. 5, an inner peripheral surface 90 </ b> A of the mold resin 65 that defines the hole 90 is connected to the opening 98, and an insertion area into which the temperature sensor 70 is inserted (perpendicular to the extending direction of the hole 90). A cylindrical portion 92 having a constant opening area), a tapered portion (first tapered portion) 91 that is connected to the distal end portion of the cylindrical portion 92, and whose insertion area decreases in the direction in which the hole portion 90 extends. It has.

  The body portion 79 of the temperature sensor 70 is connected to the head portion 74, and is connected to a column portion 77 having a constant cross-sectional area perpendicular to the extending direction of the temperature sensor 70 and a tip portion of the column portion 77. And a cone portion (second taper portion) 76 having a cross-sectional area that decreases toward the distal end side.

  The peripheral surface of the cone portion 76 of the temperature sensor 70 is inclined so as to be along the inner peripheral surface of the tapered portion 91 of the hole 90, and is in contact with the inner peripheral surface of the tapered portion 91.

  In this way, the tip of the hole 90 is tapered, and the cone 76 is provided on the tip of the temperature sensor 70, so that when the temperature sensor 70 is inserted into the hole 90, The inner peripheral surface of the detail 91 comes into contact at any position.

  That is, even if the inner diameter of the hole 90 is not manufactured with high accuracy, the peripheral surface of the cone portion 76 and the peripheral surface of the tapered portion 91 can be brought into contact with each other by inserting the temperature sensor 70.

  In particular, the cone portion 76 is provided with a temperature measuring portion 71, and the peripheral surface of the temperature measuring portion 71 can be brought into close contact with the mold resin 65. Thereby, the temperature of the mold resin 65 can be measured accurately.

  A shaft portion 72 is provided at the center of the column portion 77 of the temperature sensor 70. The cross-sectional area of the shaft portion 72 is smaller than the cross-sectional area of the column portion 77 other than the shaft portion 72, and a resin-made annular member 73 such as an O-ring is provided on the outer peripheral surface of the shaft portion 72. . That is, the annular member 73 is mounted in an annular recess formed in the pillar portion 77 and extending in the circumferential direction of the pillar portion 77.

  The outer circumferential surface of the annular member 73 protrudes slightly outward in the radial direction from the outer circumferential surface of the column portion 77, contacts the surface of the mold resin 65 that defines the hole portion 90, and the temperature sensor 70 drops off from the hole portion 90. To suppress.

  On the outer surface of the column part 77, a communication path (discharge part) 95 extending from the tip part side of the temperature sensor 70 to the head part 74 side with respect to the shaft part 72 is formed. As shown in FIG. 5, the communication path 95 includes an opening 95 </ b> A formed on the tip end side of the temperature sensor 70 with respect to the annular member 73 and an opening formed on the head portion 74 side with respect to the annular member 73. 95B and a communication portion 95C that communicates each of the openings 95A and 95B.

  6 is a cross-sectional view taken along line VI-VI in FIG. As shown in FIG. 6, the communication portion 95 </ b> C is recessed radially inward from the outer peripheral surface of the shaft portion 72 and passes through the inner peripheral surface side of the annular member 73.

  In the process of inserting the temperature sensor 70 into the hole 90, the communication path 95 can discharge the air in the hole 90 pushed away by inserting the temperature sensor 70. For this reason, even if the temperature sensor 70 is inserted into the hole 90, it is possible to suppress an increase in internal pressure in the hole 90, and to suppress the occurrence of defects such as cracks in the mold resin 65. it can. In the example shown in FIGS. 4 and 5, the temperature sensor 70 is formed with a communication path 95 to discharge the air in the hole 90, but the hole 90 is formed with a communication path that communicates with the outside. May be.

  The head portion 74 of the temperature sensor 70 is larger than the opening portion 98 of the hole portion 90, and a protruding portion 75 that protrudes outward from the outer peripheral surface of the head portion 74 is formed on the outer peripheral edge portion of the head portion 74. Is formed.

  Further, a base 80 protruding outward in the radial direction is formed in a portion of the outer peripheral surface of the mold resin 65 located around the opening 98 of the hole 90.

  A concave portion 82 for receiving the protruding portion 75 of the head portion 74 is formed in a portion of the table 80 that faces the head portion 74 of the temperature sensor 70, and a part of the mold resin 65 that defines the concave portion 82 is formed. The engaging portion 81 is engaged with the protruding portion 75.

  When the temperature sensor 70 is inserted into the hole 90, the projecting portion 75 is locked by the engaging portion 81, and the state where the temperature sensor 70 is inserted into the hole 90 can be maintained.

  FIG. 7 is a cross-sectional view showing a modification of the protrusion 75 shown in FIG. In the example shown in FIG. 7, the projecting portion 75 has an inclined portion 56 that protrudes outward from the end of the head portion 74 toward the cone portion 76 shown in FIG. A hanging portion 57 that is continuously provided and hangs downward, and an inclined portion 58 that is continuously provided at an end portion of the hanging portion 57 and is inclined toward the body portion 79 as it goes toward the cone portion 76.

  Here, when the temperature sensor 70 is inserted into the hole 90, and the temperature sensor 70 is supported and fixed by the inner peripheral surface of the mold resin 65 that defines the hole 90, the temperature sensor 70 depends on the shape of the hole 90. The position where is supported is different. For this reason, depending on the shape of the hole 90, the position of the temperature sensor 70 may be shifted in the insertion direction of the temperature sensor 70.

  On the other hand, since the inclined portion 56 is inclined so as to be closer to the base 80 side as it goes in the inserting direction of the temperature sensor 70, the inclined portion 56 is inclined even if the fixing position of the temperature sensor 70 is shifted in the inserting direction. The temperature sensor 70 can be fixed by the contact between the portion 56 and the engaging portion 81. For example, when the temperature sensor 70 protrudes in the direction opposite to the insertion direction from a predetermined position, the protruding portion 75 is slightly bent, and the inclined portion 56 or the hanging portion 57 and the engaging portion 81 are engaged. To do. For this reason, the temperature sensor 70 can be fixedly supported without accurately forming the shape of the hole 90.

  FIG. 8 is a cross-sectional view showing a first modification of temperature sensor 70 and hole 90 of the rotating electrical machine according to the present embodiment.

  In the example shown in FIG. 8, the tapered portion 93 of the hole 90 is formed so that the lower surface side is closer to the upper surface side toward the tip portion. The cone portion 78 of the temperature sensor 70 is also inclined so that the lower surface is closer to the upper surface side toward the tip.

  1 to 8, the example in which the present invention is applied to the rotating electric machine of the stator in which the coils are concentratedly wound has been described. However, the present invention is not limited to this. For example, as shown in FIG. 9, it can be applied to a stator 160 in which coils 40A to 40C are distributedly wound.

  The stator 160 includes a stator core 161, and the stator core 161 is made of a magnetic material such as iron or an iron alloy. The stator core 10 is formed with a plurality of stator teeth, and a slot portion as a recess is provided between the stator teeth. The three winding phases, U phase 40U, V phase and W phase, are wound around the stator teeth. And U phase 40U, V phase 40V, and W phase 40W are wound so that it may mutually shift on the circumference. In this way, the U-phase 40U, the V-phase 40V, and the W-phase 40W are so-called “distributed winding”.

  The temperature sensor 70 is inserted into a hole formed in the mold resin filled between the U phases 40U.

  Although the embodiment of the present invention has been described above, it should be considered that the embodiment disclosed this time is illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention is suitable for a stator of a rotating electrical machine and a rotating electrical machine including the stator.

It is a side view of the rotary electric machine which concerns on this Embodiment. It is a sectional side view in the II-II line shown in FIG. It is a top view of a stator core. It is sectional drawing for demonstrating a temperature sensor and a hole part. It is sectional drawing in the VV line in FIG. It is sectional drawing in the VI-VI line of FIG. It is sectional drawing which shows the modification of the protrusion part shown by FIG. It is sectional drawing which shows the 1st modification of the temperature sensor and hole part of the rotary electric machine which concerns on this Embodiment. It is a top view which shows the stator core of distributed winding.

Explanation of symbols

  10 Stator Core, 20 Rotor, 30 Rotating Shaft, 40 Coil, 40A Coil End, 60 Stator, 61 Stator Core, 61A Stator Teeth, 65A End, 65 Mold Resin, 70 Temperature Sensor, 71 Temperature Sensor, 73 Ring Member, 75 Projection Part (engagement part), 76 cone part (second taper part), 80 units, 81 engagement part, 91 taper (first taper part), 100 rotating electric machine.

Claims (8)

An annular stator core;
A coil wound around stator teeth formed on the stator core;
A resin part that molds the coil and can fix the coil to the stator core;
A hole formed in the resin part;
A temperature sensor inserted into the hole and supported by the inner surface of the resin part defining the hole;
A stator for a rotating electrical machine. The resin portion includes an end portion that molds a coil end portion of the coil located on the axial end portion side of the stator core,
The stator of the rotating electrical machine according to claim 1, wherein the hole portion is formed in the end portion. The hole includes a first taper that reduces an insertion area of the temperature sensor from the outer peripheral surface side to the inner peripheral surface side of the stator core,
The stator of the rotating electrical machine according to claim 1, wherein the temperature sensor includes a second taper portion extending along the first taper portion.   The stator of a rotating electrical machine according to any one of claims 1 to 3, wherein the hole extends along a radial direction of the stator core. The resin portion includes a first engagement portion formed around the hole portion,
The stator of the rotating electrical machine according to any one of claims 1 to 4, wherein the temperature sensor includes a second engagement portion that engages with the first engagement portion.   The said coil is arranged in multiple numbers along the internal peripheral surface of the said stator core, The said hole is formed in the said resin part located between the said coils adjacent to the circumferential direction, The any one of Claims 1-5 The stator of the rotary electric machine as described in 2.   The stator of the rotating electrical machine according to any one of claims 1 to 6, further comprising a discharge unit that discharges the gas in the hole part from the hole part as the temperature sensor enters the hole part.   A rotating electrical machine comprising the stator of the rotating electrical machine according to any one of claims 1 to 7.

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