JP6824765B2 - Rotating machine stator - Google Patents

Description

The present invention relates to a stator of a rotary electric machine that detects the temperature of a coil by a temperature sensor held in a sensor bracket.

Conventionally, a stator of a rotary electric machine that detects a coil temperature by a temperature sensor held in a sensor bracket has been 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 inside, and a thermistor provided at the tip of an arm extending from the bracket is elastically pressed against a coil end. ..

Japanese Unexamined Patent Publication No. 2013-51806

However, in the structure described in Patent Document 1, a casing for attaching the bracket is required, which causes an increase in component cost and assembly man-hours. Further, since the temperature measurement position accuracy deteriorates depending on the dimensional accuracy of the casing, it has been desired to improve the assembling property of the sensor bracket that holds the temperature sensor.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a stator of a rotary electric machine having excellent assembling property of a sensor bracket for holding a temperature sensor.

In order to achieve the above object, the invention according to claim 1 is
The stator core (for example, the stator core 13 of the embodiment described later) and
A coil attached to the stator core (for example, the coil 15 of the embodiment described later) and
A temperature sensor that contacts the coil and detects the temperature of the coil (for example, the temperature sensor 60 of the embodiment described later) and
A stator of a rotary electric machine (for example, a stator of a rotary electric machine), which is attached to the stator core and holds the temperature sensor so as to elastically press the temperature sensor toward the coil (for example, the sensor bracket 50 of the embodiment described later). The stator 12) of the embodiment described later.
The stator core has a fixing portion (for example, the fixing portion 13a of the embodiment described later) formed so as to project radially outward on the outer periphery of the stator core.
The fixed part is
Bolt holes for fastening the sensor bracket (for example, bolt holes 13b of the embodiment described later) and
A pair of inclined surfaces (for example, inclined surfaces 13d and 13e of the embodiments described later) approaching a virtual straight line connecting the center of the stator of the rotary electric machine and the bolt hole on both sides of the bolt hole toward the outer diameter side. And have
The sensor bracket is fastened to the bolt hole of the stator core at only one point.
The bolt hole is a bolt hole for fastening the stator core to the housing.
The sensor bracket has a claw portion that engages with the pair of inclined surfaces (for example, the claw portion 56 of the embodiment described later).
The fastening point between the sensor bracket and the stator core (for example, the fastening point P of the embodiment described later) and the contact point between the temperature sensor and the coil (for example, the contact point R of the embodiment described later) are described above. They are arranged close to each other in a direction orthogonal to the pressing direction of the sensor bracket (for example, the second direction of the embodiment described later) (for example, the third direction of the embodiment described later).

The invention according to claim 2 has the configuration of claim 1 in addition to the configuration of claim 1 .
The claw portion has a pair of the first claw portion (for example, the first claw portion 56a of the embodiment described later) that engages with one of the pair of inclined surfaces (for example, the inclined surface 13d of the embodiment described later). It has a second claw portion (for example, a second claw portion 56b of the embodiment described later) that engages with the other of the inclined surfaces of the above (for example, the inclined surface 13e of the embodiment described later).

The invention according to claim 3 is in addition to the configuration of claim 1 or 2 .
The sensor bracket includes a bracket body (for example, the bracket body 51 of the embodiment described later) having a bolt hole (for example, the bolt hole 55 of the 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, the spring portion 52 of the embodiment described later) and
A sensor holding portion (for example, a sensor holding portion 53 of the embodiment described later) provided at the tip end portion of the spring portion and holding the temperature sensor is provided.
The expansion / contraction direction of the spring portion is the same as the pressing direction.

The invention according to claim 4 has the configuration according to claim 3 in addition to the configuration according to claim 3 .
The contact point is located closer to the fastening point side than the sensor holding portion in a direction orthogonal to the pressing direction of the sensor bracket.

The invention according to claim 5 is in addition to the configuration according to any one of claims 1 to 4 .
The contact point overlaps the 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 invention of claim 1, since the sensor bracket is fastened to the stator core only at one point, the sensor bracket can be easily assembled, and the casing for attaching the sensor bracket is unnecessary, so that the component cost and the assembly man-hours can be reduced.
Further, 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, the coil is used when assembling the sensor bracket to the stator core. It is possible to suppress the rotation of the sensor bracket due to the reaction force acting on the temperature sensor. Therefore, the assembling property of the sensor bracket for holding the temperature sensor is improved, and the accuracy of the temperature measurement position of the temperature sensor can be further improved.
Further, by tightening the sensor bracket together at the fastening point for fastening the stator core to the housing, it is not necessary to provide a fastening hole for fastening the sensor bracket to the stator core.
Further, since the sensor bracket has a claw portion that engages with a pair of inclined surfaces provided on the fixing portion of the stator core, the positioning of the sensor bracket with respect to the stator core becomes easy.

According to the second aspect of the present invention, since the claw portion is composed of the first claw portion and the second claw portion, the claw portion can be easily formed by bending the plate material.

According to the invention of claim 3 , the expansion / 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, so that the pressing force that presses the temperature sensor against the coil. The load is stable.

According to the invention of claim 4 , 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, the temperature sensor is formed from the coil when the sensor bracket is assembled to the stator core. The moment that rotates the sensor bracket becomes smaller due to the reaction force acting on the sensor bracket.

According to the invention of claim 5 , since the contact point between the temperature sensor and the coil overlaps the fastening point between the sensor bracket and the stator core in a direction orthogonal to the pressing direction of the sensor bracket, the sensor bracket is used as the stator core. When assembling, the moment that rotates the sensor bracket due to 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 which concerns on this invention. It is a front view of the 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 an enlarged perspective view of the main part which shows the state which the temperature sensor held in the sensor bracket is attached to the stator core. It is a rear view which shows the state which the temperature sensor held in the sensor bracket is attached to the stator core.

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

As shown in FIG. 1, the stator 12 of the rotary electric machine 10 is housed in the housing 11, and the rotor 40 is rotatably arranged inside the stator 12.

With reference 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) accommodated in the slots 14. A phase (W phase) coil 15 and a coil 15 are provided.

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

The coil 15 of the rotary electric machine 10 is a segment conductor type coil, and as shown in FIG. 3, a plurality of coils 15 including a pair of leg portions 21 and a connecting portion 22 connecting both leg portions 21 at one end (this implementation). The substantially U-shaped coil segments 20 (4 in the form) are arranged in a row to form a bundle, and each leg 21 is inserted into each slot 14, and the protruding portion of the leg 21 protruding from the slot 14 Is bent in the circumferential direction and the corresponding ones are joined to each other. Coil ends 30 are formed so as to protrude on both sides of the stator core 13 in the axial direction. That is, a coil end 30R is formed on the back surface 13R side of the stator core 13 in which the leg portion 21 projects from the slot 14 (see FIG. 6), and the front surface of the stator core 13 in which the connecting portion 22 on the opposite side is arranged. A coil end 30F is formed on the 13F side.

A temperature sensor 60 held by the sensor bracket 50 is contact-arranged on 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 main 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 13c of the stator core 13, and is provided in one bolt hole 55 for fastening the sensor bracket 50 to the stator core 13 and a fixing portion 13a of the stator core 13. It has a claw portion 56 to be engaged with.

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 the 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 main body 51 along the inclined surfaces 13d and 13e of the fixing portion 13a of the stator core 13, and engages with one inclined surface 13d and the other inclined portion 56a. It has a second claw portion 56b that engages with the surface 13e. By engaging the first claw portion 56a and the second claw portion 56b with the inclined surfaces 13d and 13e, respectively, the positioning when assembling the sensor bracket 50 to the stator core 13 becomes easy.

The spring portion 52 is a pair of long plates curved 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 second claw portion 56b from the first claw portion 56a. A rising portion 52a that rises in a direction orthogonal to the surface 13c (hereinafter, also referred to as a first direction) and a direction that bends in a U shape from the rising portion 52a and is close to or separated from the rising portion 52a (hereinafter, both the second direction). It has a U-shaped portion 52b that expands and contracts (called).

A temperature sensor 60 for detecting the temperature of the coil end 30R in the segment conductor type coil 15 is attached to the sensor holding portion 53.

One end of the temperature sensor 60 is supported by the sensor holding portion 53, and the longitudinal direction is orthogonal to the surface 13c of the stator core 13 in the first direction (axial direction) and in the second direction (diametric direction) close to and separated from the rising portion 52a. It is arranged so as to be orthogonal to the direction (hereinafter, also referred to as a third direction). The other end of the temperature sensor 60 is arranged in the third direction toward the bolt hole 55 and comes into contact with the coil end 30R of the coil 15.

As a result, the expansion / contraction direction (second direction) of the spring portion 52 becomes the same as the pressing direction of the sensor bracket 50 that elastically presses the temperature sensor 60 toward the coil end 30R 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 stable.

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. It is arranged close to each other in the third direction. More specifically, the contact point R between the temperature sensor 60 and the coil end 30R 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.

Therefore, the distance L from the center of the bolt hole 55 to the contact point R becomes shorter, and the moment that rotates the sensor bracket 50 around the bolt hole 55 (fastening point P) by the reaction force acting on the temperature sensor 60 from the coil end 30R. Becomes smaller. As a result, 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 30R. Therefore, the assembling property 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 with the bolt hole 55 in the third direction.

As described above, according to the present embodiment, since the sensor bracket 50 is fastened to the stator core 13 at only one point, the sensor bracket 50 can be easily assembled, and the casing for attaching the sensor bracket 50 is not required. The assembly man-hours can be reduced.

Further, 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 in a direction (third direction) orthogonal to the pressing direction (second direction) of the sensor bracket 50. When the sensor bracket 50 is assembled to the stator core 13, the sensor bracket 50 can be prevented from rotating due to the reaction force acting on the temperature sensor 60 from the coil end 30R. Therefore, the assembling property 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. As a result, when the sensor bracket 50 is assembled to the stator core 13, the moment for rotating the sensor bracket 50 due to the reaction force acting on the temperature sensor 60 from the coil end 30R becomes small.

Further, by tightening the sensor bracket 50 together with the fastening point Q for fastening the stator core 13 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 center O of the stator 12 of the rotary electric machine and the bolt hole 13b on both sides of the bolt hole 13b for fastening the sensor bracket 50 toward the outer diameter side. It has a pair of inclined surfaces 13d and 13e approaching the virtual straight line IL. Since the sensor bracket 50 has a claw portion 56 that engages with the pair of inclined surfaces 13d and 13e, it is easy to position the sensor bracket 50 with respect to the stator core 13.

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

Further, since 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 30R, the temperature sensor 60 is pressed against the coil 15. The pressing load is stable.

The present invention is not limited to the above-described embodiment, and can be appropriately modified, improved, and the like.

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

Claims (5)

With the stator core
A coil attached to the stator core and
A temperature sensor that contacts the coil and detects the temperature of the coil,
A stator of a rotary electric machine, comprising a sensor bracket attached to the stator core and holding the temperature sensor so as to elastically press it toward the coil.
The stator core has a fixing portion formed so as to project radially outward on the outer circumference of the stator core.
The fixed part is
Bolt holes for fastening the sensor bracket and
Both sides of the bolt hole have a pair of inclined surfaces that approach a virtual straight line connecting the center of the stator of the rotary electric machine and the bolt hole toward the outer diameter side.
The sensor bracket is fastened to the bolt hole of the stator core at only one point.
The bolt hole is a bolt hole for fastening the stator core to the housing.
The sensor bracket has a claw portion that engages with the pair of inclined surfaces.
A stator of a rotary electric machine in which 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 the pressing direction of the sensor bracket. The stator of the rotary electric machine according to claim 1 .
The claw portion is a stator of a rotary electric machine having 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. The stator of the rotary electric machine according to claim 1 or 2 .
The sensor bracket includes 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 portion provided at the tip of the spring portion and holding the temperature sensor is provided.
The expansion / contraction direction of the spring portion is the same as the pressing direction of the stator of the rotary electric machine. The stator of the rotary electric machine according to claim 3 .
The contact point is a stator of a rotary electric machine located on the fastening point side of the sensor holding portion in a direction orthogonal to the pressing direction of the sensor bracket. The stator of the rotary electric machine according to any one of claims 1 to 4 .
The contact point is a stator of a rotary electric machine, which overlaps with a fastening point between the sensor bracket and the stator core in a direction orthogonal to the pressing direction of the sensor bracket.

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