JP6440589B2 - Temperature detection device - Google Patents

Description

  The present invention relates to a temperature detection device suitable for detecting the temperature of a stator coil of a rotating electrical machine.

  A rotating electrical machine such as an electric motor may cause insulation failure or burnout if the temperature of a coil, which is a constituent element, greatly increases during operation. For this reason, attaching a temperature sensor and detecting the temperature of a coil is performed.

Patent Document 1 proposes the following as a temperature detection device that can be easily attached to a coil and has high detection accuracy. This temperature detection device has a temperature detection element, usually a temperature detection element in contact with a linear conductor constituting a coil of a rotating electrical machine, and surrounds the outer periphery with a surrounding member. Further, as an example, the temperature detection element and the surrounding member In between, the thermal expansion member which expands and hardens | cures by heating is provided.
In the temperature detection device of Patent Document 1, when the thermal expansion member expands in volume, the temperature detection element and the linear conductor are pressed against each other, the adhesion between the temperature sensor and the linear conductor is increased, and the temperature detection accuracy is improved. It is said that it will improve.

JP 2012-57980 A

When the temperature of the coil is detected, it must be assumed that the coil is subjected to vibrations of the rotating electrical machine and machinery on which the rotating electrical machine is mounted. When the temperature detection device is displaced due to this vibration, the coil and the temperature detection element move relatively while being in contact with each other, so that both slide. When the sliding is repeated, the respective surfaces are worn, and there is a possibility that both the coil and the temperature detecting element cannot correctly perform their functions.
In light of this, in order to avoid displacement of the temperature detection element, it is only necessary to increase the volume expansion of the thermal expansion member, but this increases the stress generated in the temperature detection element, and the detection device. There is a possibility that the temperature detecting element may be damaged during the manufacturing process.

  As described above, the present invention is based on the premise that the temperature detection element is brought into contact with the coil, and an object of the present invention is to provide a temperature detection device capable of preventing the displacement of the temperature detection element while suppressing the stress applied to the temperature detection element. .

  The present invention relates to a temperature detection device that detects the temperature of a coil by contacting the surface of a coil that constitutes an electrical device, and includes a thermal sensor and a pair of electric wires electrically connected to the thermal sensor. , A first holder having a housing chamber which is fixed to the coil and houses and holds the heat sensitive body of the temperature detecting element, and the coil so that relative displacement between the first holder and the first holder does not occur. And a second holder for holding the pair of electric wires of the temperature detection element, and the heat sensitive body is characterized in that a portion exposed from the accommodation chamber contacts the surface of the coil.

In the temperature detection device of the present invention, the heat sensitive body is fixed to the coil by the first holder and the second holder. The force required for fixing is applied between the first holder and the second holder and the coil, but is not applied to the heat sensitive body accommodated in the accommodation chamber. Therefore, even if the force for fixing the first holder and the second holder is increased, the stress acting on the heat sensitive body 31 can be kept low. That is, since the first holder and the second holder can be fixed to the coil with a sufficiently strong force, the first holder and the second holder are less likely to be displaced with respect to the coil. As long as the second holder is not displaced, the heat sensitive body is not displaced relative to the coil.
On the other hand, since the part where the heat sensitive body is exposed from the storage chamber directly contacts the surface of the coil without interposing other members, the temperature detection accuracy is high.

  Here, the heat sensitive body can be held in the storage chamber by the filler filled in the storage chamber. The filler covers the heat sensitive body except for the portion that contacts the surface of the coil, but not only holds the heat sensitive body but also prevents the heat sensitive body from being affected by temperature other than the surface of the coil. be able to.

In the temperature detection device of the present invention, the first holder and the second holder are electrically connected to the coil and fixed to the coil element forming a part of the coil, and the coil element has at least one bent portion. Preferably, one or both of the first holder and the second holder is fixed to the coil element across the bent portion.
Thereby, position shift of the 1st holder and the 2nd holder can be prevented more certainly.

In the temperature detection device according to the present invention, it is preferable to include a resin mold that covers at least the storage chamber in which the heat sensitive body is stored and is formed across the first holder and the second holder.
By providing this resin mold, it is possible to more reliably prevent the heat sensitive body from being affected by temperature other than the surface of the coil.

In the temperature detection device according to the present invention, the second holder is connected to the column base provided along the axial direction of the storage chamber and at a predetermined interval from the storage chamber of the first holder, and the first holder. And a roof that is provided at a predetermined interval from the distal end side of the storage chamber and covers the distal end side.
By providing the column base and the roof, the convenience of handling the heat sensitive body and the electric wire can be improved.
For example, in a column base and a roof, a housing groove for accommodating a pair of electric wires is formed on a wall surface facing the accommodation chamber, and if a pair of electric wires are accommodated in the accommodating groove, a resin mold is formed by injection molding. In addition, it is possible to prevent the electric wire from being displaced due to the molten resin.
In addition, if the heat sensitive body is pressed against the coil by drawing the electric wire so that a compression elastic force is generated between the heat sensitive body that contacts the surface of the coil and the roof, the contact pressure between the heat sensitive body and the coil can be secured. Therefore, the temperature detection accuracy can be improved.

In the temperature detection device of the present invention, it is preferable to include an attachment that fixes the first holder and the second holder to the coil by being locked to each of the first holder and the second holder.
Thereby, although it is a simple structure, the 1st holder and the 2nd holder can be prevented from mutual displacement of the 1st holder and the 2nd holder, fixing to a coil.

  According to the present invention, on the premise that a temperature detection element is brought into contact with a coil, a temperature detection device capable of preventing a position shift of the temperature detection element while suppressing stress applied to the temperature detection element is provided.

It is a perspective view which shows the temperature detection apparatus which concerns on embodiment of this invention. It is a disassembled perspective view which shows the temperature detection apparatus which concerns on embodiment of this invention, (a) is a general view, (b) is the elements on larger scale. It is a perspective view which shows the temperature detection apparatus which concerns on embodiment of this invention, (a) is a general view, (b) is the elements on larger scale by (b) of (a), (c) is (a). It is the elements on larger scale by arrow view (c). It is a perspective view which shows the temperature detection apparatus which concerns on embodiment of this invention, (a) is a fragmentary broken view, (b) is a partial side view of (a).

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
The temperature detection device 1 according to the present embodiment includes a coil element 10 and a sensor assembly 20 fixed to the coil element 10, and a heat sensitive body 31 included in the sensor assembly 20 comes into contact with the surface of the coil element 10. The temperature of the coil element 10 can be detected. The contact here means that the heat-sensitive body 31 directly contacts the coil element 10 without using another member. The temperature detection device 1 constitutes a part of the coil element 10 by electrically connecting the coil element 10 to a coil constituting a stator (stator) of a rotating electrical machine (not shown). The temperature of the coil of the rotating electrical machine is detected by detecting the temperature of the coil element 10.
Hereinafter, the configuration of the temperature detection device 1 will be described in order, and then the effect of the temperature detection device 1 will be described.

[Coil element 10]
The coil element 10 constitutes the temperature detection device 1 together with the sensor assembly 20.
As shown in FIGS. 1 and 2, the coil element 10 is composed of a flat wire including a conductor 11 and an electrically insulating coating 13 that covers the surface of the conductor 11, and is provided with two bent portions 15 and 16. It is formed in a U shape or U shape in plan view.
The coil element 10 has two end portions of the conductor 11 exposed, and is electrically connected to a coil constituting the stator of the rotating electrical machine, thereby taking part of the stator coil.

[Sensor assembly 20]
As shown in FIGS. 1 and 2, the sensor assembly 20 includes a temperature detection element 3 and a holder 5 that holds the temperature detection element 3, and the holder 5 is fixed to a predetermined position of the coil element 10. Thus, the temperature detection element 3 is positioned at a predetermined position with respect to the coil element 10.

[Temperature detection element 3]
The temperature detection element 3 includes a heat sensitive body 31, lead wires 36A and 36B electrically connected to the heat sensitive body 31, and lead wires 38A and 38B connected to the lead wires 36A and 36B, respectively. . The lead wire 36A and the lead wire 38A that are electrically connected, and the lead wire 36B and the lead wire 38B that are electrically connected constitute a pair of electric wires in the present invention. Note that the leader lines 36A and 36B are collectively referred to as the leader line 36 when it is not necessary to distinguish between them. The same applies to the lead wires 38A and 38B.
The heat sensitive body 31 covers the rear end side of the thermistor 32, the protective layer 33 made of glass covering the periphery of the thermistor 32 arranged on the front end side, and the protective layer 33 from which the lead lines 36A and 36B are drawn out. And a ceramic protective tube 34 that mechanically reinforces. Since the thermistor 32 is inside the protective layer 33, the description is omitted here. As shown in FIG. 4, the temperature detection device 1 of the present embodiment detects the temperature of the coil element 10 by the protective layer 33 of the heat sensitive body 31 coming into direct contact with the surface of the coil element 10. Elements of the heat sensitive body 31 such as the thermistor 32 and the protective layer 33 may be appropriately set according to the temperature to be detected and other environments.

Since the leader line 36 is sealed by the protective layer 33, a jumet line whose linear expansion coefficient approximates that of glass is used. The dumet wire is an electric wire in which an alloy containing iron and nickel as main components is used as a conductor (core wire) and the periphery thereof is covered with copper. The lead wire 38 can be selected from any material as long as the lead wire 38 is not limited by the linear expansion coefficient and has predetermined heat resistance and durability.
The lead wire 36 and the lead wire 38 are electrically connected by a terminal fitting 39 provided at one end of the lead wire 38.

  As will be described in detail later, the temperature detection element 3 is held by a first holder 40, which will be described later, and a second holder 50, which is a portion of the heat sensitive body 31.

[Holder 5]
The holder 5 holds the temperature detection element 3 and is fixed at a predetermined position of the coil element 10, thereby bringing the heat sensitive body 31 of the temperature detection element 3 into contact with the coil element 10 without using another member.
As shown in FIGS. 1 and 2, the holder 5 holds the heat sensitive body 31 of the temperature detection element 3 and is fixed to a predetermined position of the coil element 10, and a lead line 36 of the temperature detection element 3. And a second holder 50 that holds the lead wire 38 and is fixed to a predetermined position of the coil element 10. In addition, the holder 5 includes an attachment 60 that is locked to both the first holder 40 and the second holder 50 and that fixes the first holder 40 and the second holder 50 to the coil element 10. In the present embodiment, the holder 5 is fixed to the coil element 10 across the one bent portion 15. The first holder 40 and the second holder 50 are disposed on the side of the front surface 10F that is one surface side of the coil element 10, and the attachment 60 is provided on the back surface 10B that is the other surface side of the coil element 10. The first holder 40 and the second holder 50 are arranged on the side.
The first holder 40, the second holder 50, and the attachment 60 are integrally formed by injection molding an electrically insulating resin.

[First holder 40]
As shown in FIGS. 2 and 3, the first holder 40 rises perpendicularly from the fixed portion 41 to the fixed portion 41 and holds the heat sensitive body 31. Holding cylinder 47 for holding.
The fixed portion 41 includes a bent portion 42 corresponding to the bent portion 15 of the coil element 10 and is formed in an L shape in plan view.
The fixing portion 41 includes a front surface 41F on which the holding cylinder 47 is erected and a back surface 41B (see FIG. 3B) which is a surface opposite to the front surface 41F. When the holder 40 is fixed to the coil element 10, the back surface 41 </ b> B faces the front surface 10 </ b> F of the coil element 10.

The fixed portion 41 is formed with a coil receiving groove 43 in which the coil element 10 is received without gaps on the back surface 41B, and the coil receiving groove 43 is provided continuously from one end 41E1 to the other end 41E2 of the fixed portion 41. Yes. The coil housing groove 43 has a depth that accommodates about half the thickness of the coil element 10, and an attachment 60 described later accommodates the remaining thickness portion.
The fixing portion 41 includes locking claws 44A and 44B (see FIG. 3B) that are locked to the attachment 60 on the back surface 41B side. The locking claws 44 </ b> A and 44 </ b> B are formed on both sides of the coil housing groove 43 in the width direction.
As described above, the fixing portion 41 includes an element for fixing and positioning the first holder 40 to the coil element 10 on the back surface 41B.

The holding cylinder 47 provided on the front surface 41F of the first holder 40 has a cylindrical shape, and a holding chamber 48 having a circular opening is provided inside the holding cylinder 47 as shown in FIG. Yes. As shown in FIG. 4B, the storage chamber 48 penetrates the front and back from the first opening 48F located on the front surface 41F side to the second opening 48B located on the back surface 41B side in the axial direction. It is formed to do. The storage chamber 48 is formed such that the depth from the first opening 48F to the second opening 48B exceeds the axial dimension of the heat sensitive body 31, and the opening diameter accommodates the heat sensitive body 31. A minute gap is formed in such a size that it can be formed around the heat sensitive body 31.
The storage chamber 48 is filled and cured with, for example, epoxy resin except for the heat sensitive body 31, and the suspended heat sensitive body 31 is held inside the storage chamber 48 by a filler 49. In addition, since the front-end | tip part of the heat sensitive body 31 which contacts the coil element 10 is not covered with the filler, it exposes from the storage chamber 48 and contacts the coil element 10.

[Second holder 50]
Next, the second holder 50 will be described.
As shown in FIGS. 2 and 3, the second holder 50 includes a fixing portion 51 that is fixed to the coil element 10, and one end 51 </ b> E <b> 1 of the fixing portion 51 that is perpendicular to the front surface 51 </ b> F of the fixing portion 51. A column base 57 that rises and a roof 59 that extends in parallel to the fixed portion 51 from the tip of the column base 57 are provided.
The second holder 50 is provided between the bent portion 15 and the bent portion 16 of the coil element 10, and the fixed portion 51 is formed straight in plan view.
The fixing portion 51 includes a front surface 51F on which the column base 57 and the roof 59 are provided, and a back surface 51B (see FIG. 4A) which is a surface opposite to the front surface 51F. When the second holder 50 is fixed to the coil element 10, the back surface 51B faces the front surface 10F of the coil element 10.

In the fixing portion 51, a coil receiving groove 53 (see FIGS. 3C and 4A) in which the coil element 10 is received without a gap is formed on the back surface 51B. The coil receiving groove 53 is a fixing portion. 51 is provided from one end 51E1 to the other end 51E2. The coil housing groove 53 has the same depth as the coil housing groove 43, and an attachment 60 described later houses the remaining thickness portion.
The fixing portion 51 includes locking claws 54A and 54B (see FIG. 3C) that are mutually locked with the attachment 60 on the back surface 51B side. The locking claws 54 </ b> A and 54 </ b> B are formed on both sides of the coil housing groove 53 in the width direction.
As described above, the fixing portion 51 includes an element for fixing and positioning the second holder 50 to the coil element 10 on the back surface 51B.

  The fixing portion 51 includes wire holding holes 55A and 55B that hold the lead wires 38A and 38B, respectively. The electric wire holding holes 55A and 55B have an opening area in which the lead wires 38A and 38B are accommodated with almost no gap. However, the tip side is slightly larger from the portion where the terminal fitting 39 connecting the lead wire 36 and the lead wire 38 is accommodated. The electric wire holding holes 55A and 55B are formed to penetrate from the one end 51E1 to the other end 51E2 of the fixing portion 51, and the lead wires 38A and 38B are drawn out from the other end 51E2. Here, as shown in FIG. 4B, since the terminal fitting 39 is locked to the peripheral edge 56 of the wire holding holes 55A and 55B, even if a tensile stress is generated in the lead wire 38, the terminal fitting 39 is Since it is received, it is not transmitted to the lead wire 36 and the heat sensitive body 31.

Next, as shown in FIG. 4, the column base 57 is provided along the axial direction (height direction z) of the storage chamber 48 and at a predetermined interval in the pull-out direction x from the storage chamber 48. . In the column base 57, electric wire holding grooves 57A and 57B connected to the electric wire holding holes 55A and 55B are formed along the direction in which the column base 57 rises. When the coil element 10 is positioned at a predetermined position, the lead wires 36A and 36B are accommodated and held in the electric wire holding grooves 57A and 57B, respectively.
The roof 59 is connected to the column base 57 and is provided at a predetermined interval from the front end side of the storage chamber 48 and covers the first opening 48F of the storage chamber 48. The roof 59 includes electric wire holding grooves 59A and 59B connected to the electric wire holding grooves 57A and 57B. When the coil element 10 is positioned at a predetermined position, the lead wires 36A and 36B are respectively connected to the electric wire holding grooves 59A and 59B. Housed and held inside. The side where the wire holding grooves 57A and 57B and the wire holding grooves 59A and 59B are provided is referred to as the inside of the column base 57 and the roof 59, and the opposite side is referred to as the outside.

[Attachment 60]
Next, the attachment 60 will be described.
As shown in FIGS. 1 and 3, the attachment 60 is engaged with each of the first holder 40 and the second holder 50 with the coil element 10 interposed therebetween. The second holder 50 is fixed to the coil element 10.
The attachment 60 includes a bent portion 62 corresponding to the bent portion 15 of the coil element 10 and the bent portion 42 of the first holder 40, and is formed in an L shape in plan view.

When the attachment 60 is engaged with each of the first holder 40 and the second holder 50, a back surface 60B that faces the coil element 10, and a front surface 60F that is a surface opposite to the back surface 60B, It has.
In the attachment 60, a coil housing groove 63 in which the coil element 10 is housed without a gap is formed on the back surface 60B. The coil housing groove 63 is provided from one end 60E1 to the other end 60E2 of the attachment 60. The coil housing groove 63 has the same depth as the coil housing grooves 43 and 53 and houses the coil element 10 together with the coil housing grooves 43 and 53.
As shown in FIGS. 3B and 3C, the attachment 60 has locking grooves 65A and 65B that are locked to the locking claws 44A and 44B of the first holder 40 on the front surface 60F side. And also have locking grooves 65C and 65D that are locked to the locking claws 54A and 54B of the second holder 50. The locking claws 54 </ b> A and 54 </ b> B are formed on both sides of the coil housing groove 53 in the width direction.

[Sensor assembly 20]
The sensor assembly 20 including the temperature detection element 3 and the holder 5 can be assembled to the coil element 10 as follows.
As shown in FIG. 2, the attachment 60 is made to be a coil element by accommodating the coil element 10 in the coil accommodation groove 63 so that the positions of the bent part 62 of the attachment 60 and the bent part 15 of the coil element 10 are matched. Assemble to 10.

Next, the 1st holder 40 is assembled | attached to the coil element 10 so that the coil element 10 may be accommodated in the coil accommodation groove | channel 43, making the back surface 41B oppose the coil element 10. FIG. At this time, the first holder 40 is assembled to the attachment 60 so that the locking claws 44A and 44B are locked in the locking grooves 65A and 65B, respectively.
Thus, the first holder 40 and the attachment 60 that are locked to each other are fixed to the coil element 10.

Next, the second holder 50 is assembled to the coil element 10. Before this, the temperature detecting element 3 is assembled to the second holder 50.
This assembly requires the temperature detection element 3 to be held in the second holder 50 by inserting the lead wires 38A and 38B of the temperature detection element 3 into the electric wire holding holes 55A and 55B of the second holder 50. On the other hand, the lead lines 36A and 36B are bent into a U-shape, and the column base 57 in a state where the temperature detection element 3 is held by the second holder 50 as shown in FIG. A first part α that rises along the first part α, a second part β that extends along the roof 59 and extends along the roof 59, and a third part γ that continues to the front end of the second part β and is parallel to the first part α. And. A heat sensitive body 31 is connected to the tip of the third part γ.
The first part α is accommodated in the electric wire holding grooves 57A and 57B of the column base 57, and the second part β is accommodated in the electric wire holding grooves 59A and 59B. The second part β is wound so as to come into contact with the inner wall surface 59C of the roof 59 while being accommodated in the wire holding grooves 59A and 59B. In a free state in which no load is applied to the temperature detection element 3, the distance from the position where the second part β contacts the roof 59 to the tip of the thermal element 31 is L1, and the second holder 50 is attached to the coil element 10. When the distance from the back surface of the roof 59 of the second part β when assembled to the front surface of the coil element 10 is L2, the lead lines 36A and 36B are configured so that L1 ≧ L2 holds. Thus, when the second holder 50 is assembled, the heat sensitive body 31 is pressed against the surface of the coil element 10 by the elastic force in the compression direction of the lead wires 36 </ b> A and 36 </ b> B.
In order to realize the pressing structure of the heat sensitive body 31, it is necessary to prepare the first holder 40 and the second holder 50 as separate bodies and go through a procedure for assembling the coil element 10.

Now, the coil element 10 is assembled to the second holder 50 so that the coil element 10 is accommodated in the coil accommodation groove 53 while the back surface 51B faces the coil element 10. At this time, the heat sensitive body 31 of the temperature detecting element 3 held by the second holder 50 is inserted into the accommodating chamber 48 of the holding cylinder 47 through the first opening 48 </ b> F of the first holder 40. The storage chamber 48 is filled with, for example, an uncured epoxy resin in advance. At this time, the second holder 50 is assembled to the attachment 60 so that the locking claws 54A and 54B are locked in the locking grooves 65C and 65D, respectively.
Thus, following the first holder 40, the second holder 50 and the attachment 60 locked to each other are fixed to the coil element 10, and the sensor assembly 20 is constructed. The epoxy resin filled in the storage chamber 48 is then cured to become a filler, and the heat sensitive body 31 is held at a predetermined position in contact with the coil element 10 inside the storage chamber 48.

  When the sensor assembly 20 is configured, the holding cylinder 47 of the first holder 40 is covered by the roof 59 of the second holder 50 from above, while the heat sensitive body 31 hanging from the leading ends of the lead lines 36A and 36B is The tip is in contact with the front surface 10F of the coil element 10, and its position is fixed by the hardened filler.

  Next, as shown in FIG. 1, the periphery of the holding cylinder 47 covered with the roof 59 in the first holder 40, the second holder 50, and the attachment 60 is covered with a resin mold 70. Thereby, the heat sensitive body 31 is excluded from being thermally influenced by other than the coil element 10 and the first holder 40, the second holder 50, and the attachment 60 are firmly fixed. Further, the resin mold 70 strengthens the protection and fixing of the lead wires 36A and 36B, the lead wires 38A and 38B, and the terminal fitting 39.

[Effect of temperature detection device 1]
Next, the effect of the temperature detection apparatus 1 having the above configuration and in which the heat sensitive body 31 contacts the coil element 10 will be described.
In the temperature detection device 1, the heat sensitive body 31 that hangs down from the lead wires 36 </ b> A and 36 </ b> B contacts the coil element 10 inside the housing chamber 48 of the holding cylinder 47. And in the inside of the storage chamber 48, the position of the heat sensitive body 31 is being fixed with the filler. Here, the sensor assembly 20 is fixed to the coil element 10 by the first holder 40 and the second holder 50 being locked to the attachment 60 with the coil element 10 interposed therebetween. It is not directly applied between the thermal element 31 and the coil element 10 accommodated and held in the accommodation chamber 48. Therefore, even if the force for fixing the sensor assembly 20 to the coil element 10 is increased, the force applied to the heat sensitive body 31 can be kept low. This is because the portion where the force for fixing the sensor assembly 20 to the coil element 10 is applied and the portion where the heat sensitive body 31 is pressed against the coil element 10, that is, the inside of the holding cylinder 47 are separated. Therefore, although the temperature detection device 1 presses the thermal element 31 against the coil element 10 by using the elastic force in the compression direction of the lead wires 36 </ b> A and 36 </ b> B, no more force is applied to the thermal element 31.

On the other hand, since the sensor assembly 20 can be fixed to the coil element 10 with a sufficiently strong force, the heat sensitive body 31 does not cause a positional shift with respect to the coil element 10.
In particular, the sensor assembly 20 is provided with a bent portion 42 and a bent portion 62 corresponding to the bent portion 15 of the coil element 10, and is assembled to the coil element 10 across the bent portion 15. Therefore, even if the coil element 10 receives vibration, the sensor assembly 20 is unlikely to be displaced with respect to the coil element 10.

Next, when the temperature detection apparatus 1 forms the resin mold 70, there is a concern that a resin pressure is applied to the heat sensitive body 31 and the heat sensitive body 31 is damaged.
However, in the temperature detection device 1, since the heat sensitive body 31 is accommodated in the accommodating chamber 48 inside the holding cylinder 47 and the roof 59 is provided above the holding cylinder 47, the resin applied to the heat sensitive body 31 from above. The pressure is relatively small. Further, although the resin pressure is received from the side of the holding cylinder 47, the resin pressure is not applied to the heat sensitive body 31 from the side because the holding cylinder 47 blocks this resin pressure.
As described above, the temperature detecting device 1 is provided with the resin mold 70, but the resin pressure received by the heat sensitive body 31 during the injection molding is small.

  Next, since the temperature detection apparatus 1 is fixing the 1st holder 40 provided with the holding cylinder 47, and the 2nd holder 50 provided with the roof 59 with the common attachment 60, between the 1st holder 40 and the 2nd holder 50, it is. No relative displacement occurs. Therefore, unless the sensor assembly 20 as a whole is displaced relative to the coil element 10, the heat sensitive body 31 is not displaced relative to the coil element 10.

Next, the temperature detection apparatus 1 accommodates the lead wires 36A and 36B in the wire holding grooves 57A and 57B and the wire holding grooves 59A and 59B. Accordingly, it is possible to prevent misalignment of the lead lines 36A and 36B during the injection molding of the resin mold 70.
During the injection molding of the resin mold 70, the molten resin flows into the column base 57 and the roof 59 from both the left and right sides in the width direction. Although this inflow should just be right and left, the inflow from either the right or left side may be quicker than the other. Then, the lead lines 36A and 36B directly receive the flow of the molten resin, and the lead lines 36A and 36B that have received the earlier flow are pushed by the flow and cause positional displacement.
However, the lead wires 36A and 36B of the temperature detection device 1 are accommodated in the wire holding grooves 57A, 57B, 59A, and 59B, and the molten resin flowing in from the left and right sides is not pushed directly, and is displaced. However, the wire holding grooves 57A, 57B, 59A, and 59B are limited to a narrow range in the width direction.

  Next, in the temperature detection device 1, the lead lines 36A and 36B are configured such that the lead lines 36A and 36B are placed on the roof 59 and L1 ≧ L2 is satisfied. Therefore, the heat sensitive body 31 can be reliably pressed against the coil element 10 by the elastic force. In this embodiment, the filling material 49 is provided inside the storage chamber 48, and this elastic force is canceled after the filling material 49 is cured. That is, the pressing by the elastic force ensures that the heat sensitive body 31 comes into contact with the coil element 10 after the filler 49 is cured.

As described above, the present invention has been described based on the preferred embodiments. However, the configuration described in the above embodiment can be selected or changed to other configurations as appropriate without departing from the gist of the present invention. is there.
Although the present embodiment includes the cylindrical holding cylinder 47 and the storage chamber 48, as long as the heat sensitive body 31 can be stored, the form thereof is arbitrary, and the horizontal cross section of the holding cylinder 47 and the storage chamber 48 is polygonal. You can also
In addition, the accommodation chamber 48 of the present embodiment accommodates the heat sensitive body 31 that contacts the surface of the coil element 10 and has a sufficient depth. However, the heat sensitive body is filled with a filler filled in the accommodation chamber 48. The depth is not limited to this depth as long as 31 can be fixed to such an extent as not to cause a positional shift. For example, the depth can accommodate about half of the heat sensitive body 31.

In the present embodiment, the sensor assembly 20 is fixed to the coil element 10 across the bent portion 15 in order to prevent displacement of the sensor assembly 20, but the present invention has a sensor assembly 20 in a straight portion. Can be fixed. In other words, when the present invention is applied to a large application of vibration and impact, the coil element 10 is provided with the bent portion 15, and the sensor assembly 20 is fixed to the coil element 10 across the bent portion 15, so that the vibration and impact are applied. For example, the sensor assembly 20 can be selected to be fixed to a straight portion of the coil element 10.
In this embodiment, the coil element 10 includes the two bent portions 15 and 16, but only one bent portion 15 is provided, and the sensor assembly 20 can be fixed across the bent portion 15. . The bending angle of the bent portion 15 is not limited to a right angle as in the present embodiment, but may be an acute angle or an obtuse angle.

  Next, although this embodiment comprises sensor assembly 20 from three members, the 1st holder 40, the 2nd holder 50, and attachment 60, the present invention is not limited to this but is equivalent to the 1st holder 40 It is sufficient if there are two members, a member to be performed and a member corresponding to the second holder 50. However, in this case, it is important that the member corresponding to the first holder 40 and the member corresponding to the second holder 50 are locked to each other to prevent mutual displacement. Further, a member corresponding to the attachment 60 is integrally formed with the member corresponding to the first holder 40 by a hinge, and a member corresponding to the attachment 60 is integrally formed with the hinge corresponding to the member corresponding to the second holder 50. A fixing means such as that should be adopted should be adopted.

  Moreover, the object to which the temperature detection device of the present invention is applied is not limited to a rotating electrical machine, but is arbitrary as long as it is an electric device including a coil. Moreover, although the example which fixes the sensor assembly 20 to the coil element 10 was shown in this embodiment, the sensor assembly 20 can also be fixed to the coil with which the rotary electric machine was equipped, for example.

DESCRIPTION OF SYMBOLS 1 Temperature detection apparatus 3 Temperature detection element 5 Holder 10 Coil element 10F Front surface 10B Back surface 11 Conductor 13 Coating | covering 15,16 Bending part 20 Sensor assembly 31 Thermosensitive body 32 Thermistor 33 Protective layer 34 Protective tube 36A, 36B Leader line 38A, 38B Lead wire 39 Terminal fitting 40 First holder 41 Fixed portion 41F Front surface 41B Back surface 41E1 One end 41E2 Other end 42 Bent portion 43 Coil housing grooves 44A, 44B Locking claws 47 Holding cylinder 48 Housing chamber 48B Second Opening 48F First opening 49 Filler 50 Second holder 51 Fixing part 51F Front surface 51B Back surface 51E1 One end 51E2 Other end 53 Coil receiving grooves 54A, 54B Locking claws 55A, 55B Electric wire holding hole 56 Perimeter 57 Column base 57A , 57B Electric wire holding groove 59 Roof 59A, 59B Electric wire holding groove 59C Inner wall surface 60 Attachment 60F front side 60B Side 2 60E1 end 60E2 other end 62 bent portion 63 coil receiving grooves 65A, 65B locking groove 65C, 65D locking groove 70 Part resin mold alpha beta Part II γ third part

Claims (8)

A temperature sensing device that detects the temperature of the coil by contacting a heat sensitive body to the surface of the coil constituting the electrical equipment,
A temperature detecting element having the thermosensitive body and a pair of electric wires electrically connected to the thermosensitive body;
A first holder having a storage chamber fixed to the coil and storing and holding the thermosensitive body of the temperature detection element;
A second holder that is fixed to the coil so as not to cause a relative displacement with respect to the first holder, and holds a pair of the electric wires of the temperature detection element,
The heat sensitive body is:
The part exposed from the storage chamber contacts the surface of the coil.
A temperature detecting device characterized by that. The heat sensitive body is:
It is held by a filler filled inside the storage chamber,
The temperature detection device according to claim 1. The first holder and the second holder are
It is fixed to a coil element that is part of the coil by being electrically connected to the coil,
The coil element has at least one bend;
One or both of the first holder and the second holder are fixed to the coil element across the bent portion,
The temperature detection device according to claim 1 or 2. Including a resin mold that covers at least the storage chamber and is formed across the first holder and the second holder;
The temperature detection apparatus as described in any one of Claims 1-3. The second holder is
A column base provided along the axial direction of the storage chamber and at a predetermined interval from the storage chamber of the first holder;
A column that is connected to the column base and provided at a predetermined interval from the front end side of the storage chamber of the first holder, and includes a roof that covers the front end side,
The temperature detection apparatus as described in any one of Claims 1-4. In the column base and the roof, a housing groove that accommodates a pair of the electric wires is formed on a wall surface facing the housing chamber,
A pair of the electric wires is received in the receiving groove;
The temperature detection device according to claim 5. The heat sensitive body is:
The wire is routed to be pressed against the coil so that an elastic force of compression is generated between the heat sensitive body that contacts the surface of the coil and the roof.
The temperature detection device according to claim 5 or 6. An attachment for fixing the first holder and the second holder to the coil by being locked to each other of the first holder and the second holder,
The temperature detection apparatus as described in any one of Claims 1-5.

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