JP2018125923A - Rotary electric machine stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine stator having excellent assemblability of a sensor bracket which holds a temperature sensor.SOLUTION: A rotary electric machine stator 12 comprises a stator core 13, a coil 15 attached to the stator core 13, a temperature sensor 60 which comes into contact with the coil 15 and detects the temperature of the coil 15, and a sensor bracket 50 which is attached to the stator core 13 and which holds the temperature sensor 60 so as to elastically press the temperature sensor 60 against the coil 15. A fastening point P between the sensor bracket 50 and the stator core 13 and a contact point R between the temperature sensor 60 and the coil 15 are disposed closely in a direction perpendicular to the pressing direction of the sensor bracket 50.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a stator for a rotating electrical machine that detects the temperature of a coil using a temperature sensor held by a sensor bracket.

  2. Description of the Related Art Conventionally, a stator for a rotating electrical machine that detects the temperature of a coil using a temperature sensor held by a sensor bracket is known. For example, in the stator described in Patent Document 1, it is described that a bracket is attached to a casing in which a stator is fixed, and a thermistor provided at a tip portion of an arm extending from the bracket is elastically pressed against a coil end. .

JP2013-51806A

  However, the structure described in Patent Document 1 requires a casing to which a bracket is attached, which increases the component cost and the number of assembly steps. Moreover, since the temperature measurement position accuracy deteriorates depending on the dimensional accuracy of the casing, it has been desired to improve the assembly of the sensor bracket for holding the temperature sensor.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a stator for a rotating electrical machine that is excellent in assembling property of a sensor bracket that holds a temperature sensor.

In order to achieve the above object, the invention according to claim 1
A stator core (for example, a stator core 13 of an embodiment described later);
A coil (for example, a coil 15 in an embodiment described later) attached to the stator core;
A temperature sensor that contacts the coil and detects the temperature of the coil (for example, a temperature sensor 60 in an embodiment described later);
A stator of a rotating electrical machine (e.g., a sensor bracket (e.g., a sensor bracket 50 of an embodiment described later)) attached to the stator core and holding the temperature sensor so as to elastically press the temperature sensor toward the coil. A stator 12) of an embodiment described later,
The sensor bracket is fastened only at one point to the stator core,
A fastening point between the sensor bracket and the stator core (for example, a fastening point P in an embodiment described later) and a contact point between the temperature sensor and the coil (for example, a contact point R in an embodiment described later) are The sensor brackets are arranged close to each other in a direction (for example, a third direction in an embodiment described later) orthogonal to a pressing direction of the sensor bracket (for example, a second direction in an embodiment described later).

In addition to the configuration of claim 1, the invention according to claim 2
The fastening point between the sensor bracket and the stator core is a fastening point for fastening the stator core to the housing (for example, a fastening point Q in an embodiment described later).

In addition to the configuration of claim 1 or 2, the invention according to claim 3
The stator core has a fixing portion (for example, a fixing portion 13a in an embodiment described later) provided with a bolt hole (for example, a bolt hole 13b in an embodiment described later) for fastening the sensor bracket,
A pair of the fixing portions approaches a virtual straight line (for example, a virtual straight line IL of an embodiment described later) connecting the center of the stator of the rotating electrical machine and the bolt hole toward the outer diameter side on both sides of the bolt hole. Of inclined surfaces (for example, inclined surfaces 13d and 13e in the embodiments described later),
The sensor bracket includes a claw portion (for example, a claw portion 56 in an embodiment described later) that engages with the pair of inclined surfaces.

In addition to the configuration of claim 3, the invention according to claim 4
The claw portion includes a first claw portion (for example, a first claw portion 56a according to an embodiment described later) that engages with one of the pair of inclined surfaces (for example, an inclined surface 13d according to an embodiment described later), and the pair. A second claw portion (for example, a second claw portion 56b of an embodiment described later) that engages with the other of the inclined surfaces (for example, an inclined surface 13e of the embodiment described later).

In addition to the structure of any one of Claims 1-4, the invention which concerns on Claim 5 is
The sensor bracket includes a bracket body (for example, a bracket body 51 of an embodiment described later) having a bolt hole (for example, a bolt hole 55 of an embodiment described later) for fastening the sensor bracket to the stator core;
A spring portion extending from the bracket body toward the inner diameter side and having elasticity in the pressing direction (for example, a spring portion 52 in an embodiment described later);
A sensor holding part (for example, a sensor holding part 53 in an embodiment described later) provided at the tip of the spring part and holding the temperature sensor;
The expansion / contraction direction of the spring part is the same as the pressing direction.

In addition to the structure of Claim 5, the invention which concerns on Claim 6 is
The contact point is located closer to the fastening point than the sensor holding portion in a direction orthogonal to the pressing direction of the sensor bracket.

In addition to the structure of any one of Claims 1-6, the invention which concerns on Claim 7 is
The contact point overlaps a fastening point between the sensor bracket and the stator core in a direction orthogonal to the pressing direction of the sensor bracket.

According to the first aspect of the present invention, since the sensor bracket is fastened to the stator core only at one point, the assembly of the sensor bracket is good and the casing for mounting the sensor bracket is unnecessary, so that the part cost and assembly man-hour can be reduced.
In addition, since the fastening point between the sensor bracket and the stator core and the contact point between the temperature sensor and the coil are arranged close to each other in a direction orthogonal to the pressing direction of the sensor bracket, when the sensor bracket is assembled to the stator core, the coil The rotation of the sensor bracket can be suppressed by the reaction force acting on the temperature sensor. Therefore, the assembly of the sensor bracket that holds the temperature sensor is improved, and the accuracy of the temperature measurement position of the temperature sensor can be further increased.

  According to the invention of claim 2, it is not necessary to provide a fastening hole for fastening the sensor bracket to the stator core by fastening the sensor bracket together with the fastening point for fastening the stator core to the housing.

  According to the invention of claim 3, since the sensor bracket has the claw portions that engage with the pair of inclined surfaces provided in the fixed portion of the stator core, the positioning of the sensor bracket with respect to the stator core is facilitated.

  According to invention of Claim 4, a nail | claw part can be easily formed by bending from a board | plate material because a nail | claw part is comprised by the 1st claw part and the 2nd claw part.

  According to the fifth aspect of the present invention, the expansion and contraction direction of the spring portion of the sensor bracket is the same as the pressing direction of the sensor bracket that elastically presses the temperature sensor toward the coil. The load is stable.

  According to the sixth aspect of the present invention, since the contact point is located closer to the fastening point side than the sensor holding portion in the direction orthogonal to the pressing direction of the sensor bracket, when the sensor bracket is assembled to the stator core, the temperature sensor is moved from the coil. The moment for rotating the sensor bracket is reduced by the reaction force acting on the.

  According to the seventh aspect of the present invention, the contact point between the temperature sensor and the coil overlaps with the fastening point between the sensor bracket and the stator core in the direction orthogonal to the pressing direction of the sensor bracket. When assembled, the moment for rotating the sensor bracket by the reaction force acting on the temperature sensor from the coil becomes extremely small.

It is a front view of the rotary electric machine of one Embodiment concerning this invention. It is a front view of a stator core. It is a perspective view of a coil segment. It is a perspective view of a temperature sensor and a sensor bracket. It is a principal part expansion perspective view which shows the state in which the temperature sensor hold | maintained at the sensor bracket was attached to the stator core. It is a rear view which shows the state in which the temperature sensor hold | maintained at the sensor bracket was attached to the stator core.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

  As shown in FIG. 1, the stator 12 of the rotating electrical machine 10 is accommodated in a housing 11, and a rotor 40 is rotatably disposed inside the stator 12.

  Referring also to FIG. 2, the stator 12 includes a stator core 13 in which a plurality of slots 14 penetrating in the axial direction are arranged at predetermined intervals in the circumferential direction, and a plurality of phases (for example, U phase, V Phase, W phase) coil 15.

  The stator core 13 is fixed to the housing 11 by inserting bolts 16 through bolt holes 13b provided in a plurality of fixing portions 13a protruding in the radial direction. The fixed portion 13a has a pair of inclined surfaces 13d and 13e that approach a virtual straight line IL that connects the center O of the rotating electrical machine 10 and the bolt hole 13b as it goes toward the outer diameter side.

  The coil 15 of the rotating electrical machine 10 is a segment conductor type coil, and as shown in FIG. 3, a plurality of (this embodiment) includes a pair of leg portions 21 and a connecting portion 22 that connects the both leg portions 21 at one end. In this embodiment, four substantially U-shaped coil segments 20 are arranged in a line to form one bundle, and each leg portion 21 is inserted into each slot 14, and the protruding portion of the leg portion 21 protruding from the slot 14. Are bent in the circumferential direction and the corresponding ones are joined together. Coil ends 30 are formed so as to protrude from both sides of the stator core 13 in the axial direction. That is, the coil end 30R is formed on the back surface 13R side of the stator core 13 from which the leg portion 21 protrudes from the slot 14 (see FIG. 6), and the front surface of the stator core 13 on which the connecting portion 22 on the opposite side is disposed. A coil end 30F is formed on the 13F side.

  A temperature sensor 60 held by the sensor bracket 50 is placed in contact with the coil end 30R of the coil 15 to measure the temperature of the coil end 30R.

  As shown in FIG. 4, the sensor bracket 50 includes a bracket body 51, a spring portion 52, and a sensor holding portion 53, and is integrally formed by pressing a metal plate.

  The bracket body 51 is a substantially triangular flat plate extending along the surface 13 c of the stator core 13. The bracket body 51 is provided with one bolt hole 55 for fastening the sensor bracket 50 to the stator core 13 and the fixing portion 13 a of the stator core 13. And a claw portion 56 to be engaged.

  Any one of the plurality of bolts 16 for fixing the stator core 13 to the housing 11 is inserted into the bolt hole 55. That is, the fastening point P between the sensor bracket 50 and the stator core 13 is a fastening point Q for fastening the stator core 13 to the housing 11, and the sensor bracket 50 is fastened together with the stator core 13 to the housing 11.

  The claw portion 56 is formed by bending from the outer edge portion of the bracket body 51 along the inclined surfaces 13d and 13e of the fixed portion 13a of the stator core 13, and the first claw portion 56a engaged with one inclined surface 13d and the other inclined surface. It has the 2nd nail | claw part 56b engaged with the surface 13e. By engaging the first claw portion 56a and the second claw portion 56b with the inclined surfaces 13d and 13e, the positioning when the sensor bracket 50 is assembled to the stator core 13 is facilitated.

  The spring portion 52 is a pair of long plates curved and formed in a substantially U shape, and the stator core 13 is formed from the outer edge portion of the bracket body 51 located on the opposite side of the first claw portion 56a with respect to the second claw portion 56b. A rising portion 52a that rises in a direction orthogonal to the surface 13c (hereinafter also referred to as a first direction), a direction that bends in a U-shape from the rising portion 52a, and approaches or separates from the rising portion 52a (hereinafter also referred to as a second direction). And a U-shaped portion 52b that expands and contracts.

  A temperature sensor 60 for detecting the temperature of the coil end 30 </ b> R in the segment conductor type coil 15 is attached to the sensor holding unit 53.

  One end of the temperature sensor 60 is supported by the sensor holding portion 53, and a longitudinal direction thereof is a first direction (axial direction) orthogonal to the surface 13c of the stator core 13 and a second direction (radial direction) approaching and separating from the upright portion 52a. It is arranged so as to be in a direction orthogonal to (hereinafter also referred to as a third direction). The other end of the temperature sensor 60 is disposed in a direction approaching the bolt hole 55 in the third direction, and contacts the coil end 30 </ b> R of the coil 15.

  Thereby, the expansion / contraction direction (second direction) of the spring portion 52 is the same as the pressing direction of the sensor bracket 50 that elastically presses the temperature sensor 60 toward the coil end 30 </ b> R of the coil 15. In other words, the spring portion 52 does not generate a rotational moment in a plane parallel to the surface 13c of the stator core 13 (in a plane including the second direction and the third direction). Therefore, the pressing load that presses the temperature sensor 60 against the coil end 30R is stabilized.

  Further, as shown in FIG. 6, the fastening point P between the sensor bracket 50 and the stator core 13 and the contact point R between the temperature sensor 60 and the coil end 30R are orthogonal to the pressing direction (second direction) of the sensor bracket 50. In the third direction. More specifically, the contact point R between the temperature sensor 60 and the coil end 30 </ b> R is located closer to the fastening point P side between the sensor bracket 50 and the stator core 13 than the sensor holding portion 53 in the third direction.

  Accordingly, the distance L from the center of the bolt hole 55 to the contact point R is shortened, and the moment for rotating the sensor bracket 50 about the bolt hole 55 (fastening point P) by the reaction force acting on the temperature sensor 60 from the coil end 30R. Becomes smaller. Thereby, when the sensor bracket 50 is assembled to the stator core 13, it is possible to suppress the rotation of the sensor bracket 50 due to the reaction force acting on the temperature sensor 60 from the coil end 30 </ b> R. Therefore, the assembly of the sensor bracket 50 that holds the temperature sensor 60 is improved, and the accuracy of the temperature measurement position of the temperature sensor 60 can be further improved. It is most preferable that the contact point R between the temperature sensor 60 and the coil end 30R overlaps the bolt hole 55 in the third direction.

  As described above, according to this embodiment, since the sensor bracket 50 is fastened to the stator core 13 only at one point, the assembly of the sensor bracket 50 is good, and a casing for attaching the sensor bracket 50 is unnecessary, so that the component cost, Assembly time can be reduced.

  In addition, the fastening point P between the sensor bracket 50 and the stator core 13 and the contact point R between the temperature sensor 60 and the coil end 30R are perpendicular to the pressing direction (second direction) of the sensor bracket 50 (third direction). Therefore, when the sensor bracket 50 is assembled to the stator core 13, the rotation of the sensor bracket 50 due to the reaction force acting on the temperature sensor 60 from the coil end 30 </ b> R can be suppressed. Therefore, the assembly of the sensor bracket 50 that holds the temperature sensor 60 is improved, and the accuracy of the temperature measurement position of the temperature sensor 60 can be further improved.

  In particular, the contact point R between the temperature sensor 60 and the coil end 30R is located closer to the fastening point P than the sensor holding portion 53 in the direction (third direction) orthogonal to the pressing direction (second direction) of the sensor bracket 50. Therefore, when the sensor bracket 50 is assembled to the stator core 13, the moment for rotating the sensor bracket 50 by the reaction force acting on the temperature sensor 60 from the coil end 30 </ b> R becomes small.

  Further, by fastening the sensor bracket 50 to the fastening point Q at which the stator core 13 is fastened to the housing 11, it is not necessary to provide a fastening hole for fastening the sensor bracket 50 to the stator core 13.

  Further, the fixing portion 13a of the stator core 13 connects the bolt hole 13b for fastening the sensor bracket 50 and the center O of the stator 12 of the rotating electrical machine and the bolt hole 13b toward the outer diameter side on both sides of the bolt hole 13b. It has a pair of inclined surfaces 13d and 13e that approach the virtual straight line IL. Since the sensor bracket 50 includes the claw portions 56 that engage with the pair of inclined surfaces 13d and 13e, the positioning of the sensor bracket 50 with respect to the stator core 13 is facilitated.

  Further, the claw portion 56 includes a first claw portion 56a that engages with the inclined surface 13d of the pair of inclined surfaces 13d and 13e, and a second claw portion 56b that engages with the inclined surface 13e. Thus, the claw portion 56 can be easily formed by bending.

  Further, the expansion / contraction direction of the spring portion 52 of the sensor bracket 50 is the same as the pressing direction of the sensor bracket 50 that elastically presses the temperature sensor 60 toward the coil end 30 </ b> R, so that the temperature sensor 60 is pressed against the coil 15. The pressing load is stabilized.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

12 Stator 13 Stator core 13a Fixed portion 13b Bolt hole 13d Inclined surface 13e Inclined surface 15 Coil 50 Sensor bracket 51 Bracket main body 52 Spring portion 53 Sensor holding portion 55 Bolt hole 56 Claw portion 56a First claw portion 56b Second claw portion 60 Temperature sensor IL virtual straight line P fastening point R between sensor bracket and stator core contact point Q between temperature sensor and coil fastening point for fastening stator core to housing

Claims (7)

A stator core;
A coil attached to the stator core;
A temperature sensor that contacts the coil and detects the temperature of the coil;
A stator of a rotating electrical machine, comprising: a sensor bracket attached to the stator core and holding the temperature sensor so as to elastically press the temperature sensor toward the coil,
The sensor bracket is fastened only at one point to the stator core,
A stator for a rotating electrical machine, wherein a fastening point between the sensor bracket and the stator core and a contact point between the temperature sensor and the coil are arranged close to each other in a direction orthogonal to a pressing direction of the sensor bracket. A stator for a rotating electrical machine according to claim 1,
The stator of a rotating electrical machine, wherein the fastening point between the sensor bracket and the stator core is a fastening point for fastening the stator core to a housing. A stator for a rotating electrical machine according to claim 1 or 2,
The stator core has a fixing portion provided with a bolt hole for fastening the sensor bracket,
The fixing portion has a pair of inclined surfaces that approach a virtual straight line connecting the center of the stator of the rotating electrical machine and the bolt hole as it goes to the outer diameter side on both sides of the bolt hole,
The sensor bracket is a stator of a rotating electrical machine having claw portions that engage with the pair of inclined surfaces. A stator for a rotating electrical machine according to claim 3,
The claw portion includes a first claw portion that engages with one of the pair of inclined surfaces, and a second claw portion that engages with the other of the pair of inclined surfaces. A stator for a rotating electrical machine according to any one of claims 1 to 4,
The sensor bracket is a bracket body having a bolt hole for fastening the sensor bracket to the stator core;
A spring portion extending from the bracket body toward the inner diameter side and having elasticity in the pressing direction;
A sensor holding part that is provided at the tip of the spring part and holds the temperature sensor;
The stator of the rotating electrical machine, wherein the expansion and contraction direction of the spring portion is the same as the pressing direction. A stator for a rotating electrical machine according to claim 5,
The stator of the rotating electrical machine, wherein the contact point is located closer to the fastening point than the sensor holding portion in a direction orthogonal to the pressing direction of the sensor bracket. A stator for a rotating electrical machine according to any one of claims 1 to 6,
The said contact point is a stator of a rotary electric machine which overlaps with the fastening point of the said sensor bracket and the said stator core in the direction orthogonal to the pressing direction of the said sensor bracket.

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