阅读说明：本技术 旋转电机的温度检测元件的安装结构 (Mounting structure of temperature detection element of rotating electric machine ) 是由 植松洋一 七五三挂贵浩 宫川雄磨 于 2020-02-21 设计创作，主要内容包括：本发明提供一种能够容易地进行温度检测元件的更换、维护检查等的旋转电机的温度检测元件的安装结构。该安装结构是具有树脂模制部(10)的电机的热敏电阻(30)的安装结构,所述树脂模制部以在内部具有进行与外部设备的连接的连接线(21A～21C)的方式利用树脂模制成形有定子的线圈端,其中,所述安装结构具备：安装槽(11A、11B),所述安装槽形成于树脂模制部(10)的外表面,以使热敏电阻(30)的主体(31)与连接线(21A～21C)接近的方式将主体(31)能够装卸地保持在安装槽(11A、11B)的内侧；罩(14),所述罩能够装卸地安装于树脂模制部(10)并以跨过安装槽(11A、11B)的方式配设；以及板簧(15),所述板簧能够装卸地安装在罩(14)的内侧,对安装槽(11A、11B)内的主体(31)朝向安装槽(11A、11B)的底面(11Aa、11Ba)施力。(The invention provides a mounting structure of a temperature detection element of a rotating motor, which can easily perform replacement, maintenance inspection and the like of the temperature detection element. The mounting structure is a mounting structure of a thermistor (30) of a motor having a resin molding part (10) in which a coil end of a stator is molded by resin so as to have connecting wires (21A-21C) for connection with an external device, and the mounting structure comprises: mounting grooves (11A, 11B) formed on the outer surface of the resin mold section (10) and configured to detachably hold the main body (31) of the thermistor (30) inside the mounting grooves (11A, 11B) so that the main body (31) and the connection lines (21A-21C) are close to each other; a cover (14) that is detachably attached to the resin mold section (10) and is disposed so as to straddle the mounting grooves (11A, 11B); and a leaf spring (15) which is detachably mounted on the inner side of the cover (14) and biases the main body (31) in the mounting grooves (11A, 11B) toward the bottom surfaces (11Aa, 11Ba) of the mounting grooves (11A, 11B).)

1. A mounting structure of a temperature detection element of a rotating electrical machine having a resin mold portion in which a coil end of a stator is molded by resin so as to have a connection wire for connection with an external device inside, the mounting structure comprising:

a mounting groove formed on an outer surface of the resin mold part, the mounting groove detachably holding the temperature detection element inside the mounting groove so that the temperature detection element is close to the connection line;

a cover detachably attached to the resin mold section and disposed so as to straddle the mounting groove; and

and a biasing member detachably attached to an inner side of the cover, and biasing the temperature detection element in the mounting groove toward a bottom surface of the mounting groove.

2. The mounting structure of the temperature detecting element of the rotating electric machine according to claim 1,

the cover is provided with:

a top plate that holds the force application member;

a pair of wall plates that are provided so as to protrude from the top plate so as to face each other on one edge end side and the other edge end side of the top plate, respectively, and that connect base end sides of the pair of wall plates to the top plate; and

engaging claws respectively projected from the facing direction outer side surfaces of the front end side of the wall plate,

the mounting structure includes brackets that are provided upright in the resin mold so as to be paired with each other with the mounting groove in between, and that have engaging holes that are detachably engaged with the engaging claws of the cover, respectively.

3. The mounting structure of the temperature detecting element of the rotating electric machine according to claim 2,

the force application member is a plate spring formed with a notch groove,

the cover is provided with:

a positioning projection that is provided so as to protrude from an inner surface of the top plate, and that is detachably inserted into the notch groove of the plate spring so as to restrict rotation of the plate spring about a shaft that is centered in a direction along the biasing direction; and

and a pressing protrusion protruding from an inner surface of the top plate and engaged with the plate spring so as to press the notch groove of the plate spring against the positioning protrusion.

4. The mounting structure of the temperature detection element of the rotating electric machine according to any one of claims 1 to 3,

the mounting structure includes a clamping portion formed in the resin mold portion and configured to clamp the lead of the temperature detection element so that the lead of the temperature detection element can be attached and detached.

5. The mounting structure of the temperature detecting element of the rotating electric machine according to claim 4,

the clamping portions are formed on the inner side surfaces of the mounting groove and are formed closer to the temperature detection element than the end surface of the mounting groove on the wire side.

6. The mounting structure of the temperature detection element of the rotating electric machine according to any one of claims 1 to 4,

the length t between the bottom surface of the mounting groove of the resin molding part and the connecting wire is 300-450 μm.

7. The mounting structure of the temperature detection element of the rotating electric machine according to any one of claims 1 to 6,

the resin mold part is provided with a ridge part at both sides of the mounting groove,

the protrusion is disposed between the lead of the temperature detection element and the cover.

Technical Field

The present invention relates to a mounting structure of a temperature detection element of a rotating electrical machine having a resin molded portion in which a coil end of a stator is molded by resin so as to have a connection wire for connection with an external device inside, and is particularly effective when applied to a motor for traveling use used in an electric vehicle.

Background

A motor for traveling used in an electric vehicle is required to have high torque performance and high output, and therefore, generates a large amount of heat and is likely to reach a high temperature. Therefore, in order to grasp the temperature state of the motor, a temperature detection element is mounted around a connection line for connection to an external device.

For example, in patent documents 1 and 2, a temperature sensor is fixed to a terminal block of a mounting terminal by a bolt via a bracket.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2018-042303

Patent document 2: japanese patent laid-open publication No. 2018-042369

Disclosure of Invention

Problems to be solved by the invention

In the inventions described in patent documents 1 and 2, since the temperature sensor is fixed by a bolt, it is necessary to attach and detach the bolt using a tool when performing maintenance inspection of the temperature sensor or replacement due to damage, which is very time consuming.

Such a problem may occur not only when a temperature sensor is mounted on a motor for traveling used in an electric vehicle, but also when a temperature detection element is mounted on a rotating electric machine such as another motor or a generator.

Therefore, an object of the present invention is to provide a temperature detection element mounting structure for a rotating electrical machine, which can facilitate replacement, maintenance, and inspection of the temperature detection element.

Means for solving the problems

A mounting structure of a temperature detection element of a rotating electrical machine according to the present invention for solving the above-described problems is a mounting structure of a temperature detection element of a rotating electrical machine having a resin mold portion in which a coil end of a stator is molded by resin so as to have a connection wire for connecting to an external device inside, the mounting structure including: a mounting groove formed on an outer surface of the resin mold part, the mounting groove detachably holding the temperature detection element inside the mounting groove so that the temperature detection element is close to the connection line; a cover detachably attached to the resin mold section and disposed so as to straddle the mounting groove; and a biasing member detachably attached to an inner side of the cover, and biasing the temperature detection element in the mounting groove toward a bottom surface of the mounting groove.

In addition, a structure for mounting a temperature detection element of a rotating electrical machine according to the present invention is a structure for mounting a temperature detection element of a rotating electrical machine, wherein the cover includes: a top plate that holds the force application member; a pair of wall plates that are provided so as to protrude from the top plate so as to face each other on one edge end side and the other edge end side of the top plate, respectively, and that connect base end sides of the pair of wall plates to the top plate; and engagement claws that are provided so as to protrude from outer surfaces of the wall plate on the front end side in the opposite direction, wherein the mounting structure includes brackets that are provided upright in the resin mold so as to form a pair with the mounting groove in between, and that have engagement holes that are formed in each of the brackets and detachably engage with the engagement claws of the cover.

In the structure for mounting a temperature detection element of a rotating electrical machine according to the present invention, the urging member is a plate spring having a notch groove formed therein, and the cover includes: a positioning projection that is provided so as to protrude from an inner surface of the top plate, and that is detachably inserted into the notch groove of the plate spring so as to restrict rotation of the plate spring about a shaft that is centered in a direction along the biasing direction; and a pressing protrusion protruding from an inner surface of the top plate and engaged with the plate spring so as to press the notch groove of the plate spring against the positioning protrusion.

In the mounting structure of the temperature detection element of the rotary electric machine according to the present invention, the mounting structure includes a clamping portion formed in the resin mold portion and configured to clamp the lead wire of the temperature detection element so that the lead wire of the temperature detection element can be attached and detached. The clamping portions are preferably formed on the inner surfaces of the mounting groove on the left and right sides, respectively, and are preferably formed on the temperature detection element side of the end surface of the mounting groove on the wire side.

In the structure for mounting a temperature detection element of a rotating electrical machine according to the present invention, the length t between the bottom surface of the mounting groove of the resin mold and the connection line is 300 to 450 μm. In this case, the resin mold part may include a raised part on both sides of the mounting groove. The protrusion is preferably disposed between the lead of the temperature detection element and the cover.

ADVANTAGEOUS EFFECTS OF INVENTION

Further, according to the mounting structure of the temperature detection element of the rotating electrical machine of the present invention, the temperature detection element can be easily attached to and detached from the resin mold portion without using a tool, and therefore, replacement, maintenance inspection, and the like of the temperature detection element can be easily performed, and work efficiency can be improved.

Drawings

Fig. 1 is an external perspective view showing a main part of a mounting structure of a temperature detection element of a rotating electric machine according to embodiment 1.

Fig. 2 is a sectional view of fig. 1.

Fig. 3 is a partially exploded perspective view of fig. 1.

Fig. 4 is an enlarged extracted view of the resin mold of fig. 3.

Fig. 5 is an exploded perspective view of the cover and leaf spring of fig. 3.

Fig. 6 is an external structural view of a mounting structure of a temperature detection element of a rotating electric machine according to embodiment 2.

Fig. 7 is an external structural view of the thermistor.

Fig. 8 is a perspective view showing a portion of the mounting groove.

Fig. 9 is a structural diagram of a mounting structure of a temperature detection element of a rotating electric machine according to embodiment 3.

Detailed Description

An embodiment of a mounting structure of a temperature detection element of a rotating electrical machine according to the present invention will be described with reference to the drawings, but the present invention is not limited to the following examples 1 to 3 described with reference to the drawings.

< example 1>

First, example 1 will be described with reference to fig. 1 to 5. Here, the mounting structure of the temperature detection element of the rotating electric machine according to the present invention is applied to mounting of a thermistor to a three-phase ac motor for traveling used in an electric vehicle.

As shown in fig. 1 and 2, in a resin mold section 10 in which coil ends of a stator of a three-phase ac motor are molded by a heat-resistant resin such as polyphenylene sulfide (PPS), flat connecting wires 21A, 21B, and 21C made of copper, whose base end sides are connected to the coils, are arranged in a row in a longitudinal direction along a circumferential direction (a direction perpendicular to a paper surface in fig. 2) of a rotation shaft of the motor and along an axial direction (a left-right direction in fig. 2) of the rotation shaft, and distal end sides of the connecting wires 21A to 21C are connected to an external device such as a battery via terminals of respective phases located outside the resin mold section 10.

In the outer surface of the resin mold part 10 on the radial outer side of the rotating shaft of the motor, concave positioning mounting grooves 11A, 11B for detachably holding a flat thermistor 30 as a temperature detection element on the inner side are formed in a line along the axial direction of the rotating shaft so that the longitudinal direction thereof is along the circumferential direction of the rotating shaft and is positioned above the connecting lines 21A to 21C arranged in parallel, and the length (thickness) t between the bottom surfaces (temperature measurement surfaces) 11Aa, 11Ba of the mounting grooves 11A, 11B and the connecting lines 21A to 21C is 300 to 450 [ mu ] m (300 [ mu ] t [ mu ] m to 450 [ mu ] m).

This is because: if the length (thickness) t between the bottom surfaces 11Aa and 11Ba of the mounting grooves 11A and 11B and the connecting lines 21A to 21C is less than 300 μm (t <300 μm), it is difficult to exhibit sufficient insulation performance, and if it exceeds 450 μm (t >450 μm), it is not preferable because the heat flux due to the resin between the bottom surfaces 11Aa and 11Ba of the mounting grooves 11A and 11B and the connecting lines 21A to 21C increases, and it is difficult to accurately measure the temperatures of the connecting lines 21A to 21C.

As shown in fig. 1, 3, and 4, on both ends in the short-side direction of the mounting grooves 11A and 11B (one end of the left and right inner surfaces of the mounting grooves 11A and 11B) on one end side in the long-side direction of the mounting grooves 11A and 11B of the resin mold part 11, bulging parts 12A and 12B for detachably sandwiching a lead wire (lead wire) 32 of the thermistor 30 are provided in pairs, respectively, and the bulging parts 12A and 12B in the pairs are formed so that the arc surfaces face each other. The opposed bulging portions 12A and 12B form a nip portion in the present embodiment.

As shown in fig. 1 to 4, a pair of brackets 13 projecting radially outward (upward in fig. 2) of the rotary shaft of the motor are provided upright on both axial end sides (left and right end sides in fig. 2) of the resin mold 10 such that the mounting grooves 11A and 11B are located between the pair of brackets 13 facing each other. The bracket 13 is formed with engagement holes 13a each of which penetrates in the axial direction (the left-right direction in fig. 2) of the rotary shaft with its longitudinal direction along the circumferential direction of the rotary shaft (the direction perpendicular to the paper surface in fig. 2).

As shown in fig. 1 to 3 and 5, a cover 14 made of heat-resistant resin such as PPS (polyphenylene sulfide) is arranged in an コ shape on the mounting grooves 11A and 11B of the resin mold 10 so as to straddle the mounting grooves 11A and 11B, and the cover 14 includes: a top plate 14 a; a pair of wall plates 14b that are provided so as to protrude from the top plate 14a so as to face each other on one edge end side and the other edge end side of the top plate 14a, respectively, and that connect the base end sides of the pair of wall plates 14b to the top plate 14 a; and engagement claws 14c that are provided so as to protrude from the outer surfaces of the wall plates 14b on the outer surfaces thereof in the opposite direction on the front end side (lower side in fig. 2), respectively, and that are detachably engaged with the engagement holes 13a of the bracket 13 of the resin mold 10.

A plate spring 15 made of SUS304 steel or the like is disposed inside the cover 14 as a biasing member that biases and presses the main body 31 of the thermistor 30 placed in the mounting grooves 11A and 11B of the resin mold 10 toward the bottom surfaces 11Aa and 11Ba of the mounting grooves 11A and 11B.

On the inner surface of the top plate 14a of the cover 14, there are provided, in a protruding manner: a positioning projection 14d detachably inserted into a concave notch groove 15a formed in the plate spring 15; and a pressing projection 14e that engages with the plate spring 15 so as to press the notch groove 15a of the plate spring 15 against the positioning projection 14d, wherein the positioning projection 14d has a square shape that engages with the notch groove 15a of the plate spring 15 so as to restrict rotation of the plate spring 15 about an axis that is centered in a direction along the biasing direction (downward direction in fig. 2) of the plate spring 15.

In the mounting structure of the thermistor 30 of the motor according to the present embodiment, first, the main body 31 of the thermistor 30 is placed in the mounting grooves 11A and 11B of the resin mold 10, and the lead wire 32 is sandwiched between the bulging portions 12A and 12B.

Accordingly, when the leaf spring 15 is sandwiched between the positioning projection 14d and the pressing projection 14e so that the notch groove 15a of the leaf spring 15 is inserted into the positioning projection 14d of the cover 14 and the notch groove 15a is pressed against the positioning projection 14d, the leaf spring 15 is easily positioned and held and fixed with respect to the top plate 14a of the cover 14.

When the cover 14 is attached to the bracket 13 so that the engagement claws 14c of the cover 14 engage with the engagement holes 13a of the bracket 13 of the resin mold portion 10, the plate spring 15 applies a force so as to press the main body 31 of the thermistor 30 against the bottom surfaces 11Aa and 11Ba of the attachment grooves 11A and 11B of the resin mold portion 10, thereby bringing the main body 31 into close contact with the inside of the attachment grooves 11A and 11B, and applies a force so as to press the engagement claws 14c of the cover 14 against the inner surface of the engagement holes 13a of the bracket 13, thereby bringing the cover 14 into close contact with the bracket 13.

Thus, even when vibration is applied to the motor from various directions, the cover 14 can be reliably fixed to the resin mold 10, and the main body 31 of the thermistor 30 can be reliably fixed to the mounting grooves 11A and 11B.

In addition, when the wall plate 14b of the cover 14 is biased so that the distal ends (lower end in fig. 2) of the wall plate 14b are brought close to each other in the case of replacement, maintenance inspection, or the like of the thermistor 30 due to damage, the engaging claws 14c of the cover 14 are easily disengaged from the engaging holes 13a of the bracket 13 of the resin mold portion 10, and the cover 14 and the leaf spring 15 can be easily detached from the resin mold portion 10.

Thus, the lead wire 32 of the thermistor 30 can be removed from between the bulging portions 12A and 12B of the resin mold portion 10, and the main body 31 can be taken out from the mounting grooves 11A and 11B, so that the thermistor 30 can be easily taken out from the resin mold portion 10.

Therefore, according to the present embodiment, since the thermistor 30 can be easily attached to and detached from the resin mold portion 10 without using a tool, replacement, maintenance inspection, and the like of the thermistor 30 can be easily performed, and work efficiency can be improved.

Further, the plate spring 15 biases the main body 31 of the thermistor 30 so as to press against the bottom surfaces 11Aa and 11Ba of the mounting grooves 11A and 11B of the resin mold portion 10 to bring the main body 31 into close contact with the inside of the mounting grooves 11A and 11B, and biases the cover 14 so as to press the engaging claw 14c of the cover 14 against the inner surface of the engaging hole 13a of the bracket 13 to bring the cover 14 into close contact with the bracket 13, so that even if vibration is applied to the motor from various directions, the cover 14 can be reliably fixed to the resin mold portion 10, and the main body 31 of the thermistor 30 can be reliably fixed to the mounting grooves 11A and 11B, and vibration resistance can be improved.

Further, since the leaf spring 15 is sandwiched between the positioning projection 14d and the pressing projection 14e so that the notch groove 15a of the leaf spring 15 is inserted into the positioning projection 14d of the cover 14 and the notch groove 15a is pressed against the positioning projection 14d, the leaf spring 15 can be easily positioned, held, and fixed with respect to the top plate 14a of the cover 14, and therefore, even if vibration is applied to the motor from various directions, positional displacement of the leaf spring 15 can be prevented, and vibration resistance can be improved.

Further, since the length (thickness) t between the bottom surfaces 11Aa, 11Ba of the mounting grooves 11A, 11B of the resin mold part 10 and the connecting lines 21A to 21C is 300 to 450 μm (300. ltoreq. t.ltoreq.450 μm), it is possible to exhibit sufficient insulation performance, and it is possible to prevent an increase in heat flux caused by the resin between the bottom surfaces 11Aa, 11Ba of the mounting grooves 11A, 11B of the resin mold part 10 and the connecting lines 21A to 21C, and to detect the temperatures of the connecting lines 21A to 21C more accurately and quickly.

The present embodiment has been described with respect to the case where the thermistor 30 is mounted to a motor for running used in an electric vehicle, but the present invention can be similarly applied to a case where a temperature detection element is mounted to another rotating electrical machine such as a motor or a generator.

< example 2>

Next, example 2 will be described with reference to fig. 6 to 8. Embodiment 2 relates to the groove shape of the mounting grooves 11A, 11B. In example 1, a method of fixing the main body 31 of the thermistor (temperature sensing unit) 30 to the mounting grooves 11A and 11B by the cover 14 is adopted.

However, when a tensile load such as pulling the main body 31 out of the crossover 40 (see fig. 6) is applied to the lead wire 32, the end surface 43 of the main body 31 is pulled into contact with the end surfaces 11Ab and 11Bb of the mounting grooves 11A and 11B, and a gap is generated between the main body 31 and the crossover 40, which may make it difficult to accurately estimate the accurate motor coil temperature.

Therefore, in embodiment 2, the cause of the above-described gap generation, that is, the gap generation between the main body 31 and the crossover 40 is prevented. Specifically, as shown in fig. 8, the positions where the bulging portions 12A and 12B are formed are moved toward the bottom surfaces 11Aa and 11Ba of the mounting grooves 11A and 11B. Here, the bulging portions 12A, 12B are formed at positions corresponding to the bottom surfaces 11Aa, 11Ba and at positions closer to the main body 31 side (the crossover 40 side) than the end surfaces 11Ab, 11Bb of the mounting grooves 11A, 11B on the lead wire 32 side (the opposite side to the crossover 40).

According to this configuration, when the tensile load is applied to the lead wire 32, the end surface 43 of the body 31 collides with the bulging portions 12A and 12B, and the body 31 is restricted from being pulled toward the lead wire 32. Therefore, the main body 31 is not pulled until the both surfaces 43, 11Ab, and 11Bb come into contact with each other, and the gap is eliminated, so that the motor coil temperature can be accurately estimated. In example 2 as well, the body 31 is fixed to the mounting grooves 11A and 11B using the cover 14, as in example 1.

< example 3>

Finally, embodiment 3 will be described with reference to fig. 9. Embodiment 3 can prevent the main body 31 of the thermistor 30 from falling off.

In embodiment 1, as shown in fig. 2, a large gap S1 is formed between the cover 14 and the opening upper end 44 of the mounting grooves 11A, 11B. Therefore, when a tensile load exceeding the biasing force of the plate spring 15 is applied to the lead wire 32 during assembly, the main body 31 may fall off, and a structure in which the main body 31 is hard to fall off is proposed in example 3.

Specifically, in the resin mold section 10, resin ridges 45 are integrally formed on both sides 44 of the mounting grooves 11A and 11B (upper end portions of the openings of the mounting grooves 11A and 11B). The bump 45 is erected between the cover 14 and the lead wire 32 so that its longitudinal section is substantially rectangular, and the gap S2 between the cover 14 and the lead wire 32 is narrower than the gap S1.

Therefore, even if a tensile load exceeding the above-described biasing force of the plate spring 15 is generated in the lead 32 at the time of assembly, the lead interferes with the ridge portion 45, and the main body 31 is less likely to fall off. This eliminates the need to assemble the thermistor 30 while taking the thermistor out of the way, and improves the assembly efficiency. Similarly to embodiment 2, the formation positions of the bulging portions 12A and 12B may be moved to the bottom surfaces 11Aa and 11Ba sides of the mounting grooves 11A and 11B.

Industrial applicability

The mounting structure of the temperature detection element of the rotating electrical machine according to the present invention can facilitate replacement, maintenance, inspection, and the like of the temperature detection element, and can improve the work efficiency, and therefore, can be used very advantageously in industry.

Description of the reference numerals

10 resin molded part

11A, 11B mounting groove

11Aa, 11Ba bottom

End faces of 11Ab and 11Bb mounting grooves

12A, 12B bulge parts

13 bracket

13a engaging hole

14 cover

14a top plate

14b wall plate

14c engaging claw

14d positioning projection

14e pressing projection

15 leaf spring

15a notch groove

21A-21C connecting line

30 thermistor

31 main body

32 wire

40 overlapping wire

41 stator core

42 flat wire coil

43 end face of the body

45 raised part