WO2022130577A1 - 温度センサおよび回転電機 - Google Patents
温度センサおよび回転電機 Download PDFInfo
- Publication number
- WO2022130577A1 WO2022130577A1 PCT/JP2020/047212 JP2020047212W WO2022130577A1 WO 2022130577 A1 WO2022130577 A1 WO 2022130577A1 JP 2020047212 W JP2020047212 W JP 2020047212W WO 2022130577 A1 WO2022130577 A1 WO 2022130577A1
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- WO
- WIPO (PCT)
- Prior art keywords
- coil
- temperature sensor
- stator
- support portion
- bracket
- Prior art date
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/25—Devices for sensing temperature, or actuated thereby
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
Definitions
- the present invention relates to a temperature sensor suitable for detecting the temperature of the coil of the stator of a rotary electric machine.
- the temperature of the coil rises when a current flows through the coil provided in the stator.
- the temperature of the coil is detected by using a temperature sensor, and the operation of the rotary electric machine is controlled according to the detected temperature.
- Patent Document 1 proposes that in a stator having a plurality of teeth, a temperature sensor is inserted into a gap formed between the coils wound around the adjacent teeth in the circumferential direction to detect the temperature of the coil. do.
- the holder for holding the temperature sensor of Patent Document 1 is made of an elastic material. When this holder is elastically deformed and inserted between the coils, the temperature measuring portion of the temperature sensor comes into contact with at least one coil.
- An object of the present invention is to provide a temperature sensor capable of preventing misalignment with respect to a coil and disconnection from the coil, and a rotary electric machine provided with the temperature sensor.
- the present invention is a temperature sensor for detecting the temperature of a coil provided in a stator of a rotary electric machine, and encloses a heat sensitive body, an electric wire electrically connected to the heat sensitive body, a part of the electric wire, and the heat sensitive body.
- a sensor element including a long covering body, which is inserted into a gap formed by a coil along the longitudinal direction of the covering body, a fixing portion fixed to a stator, and one end side of the sensor element in the longitudinal direction. It comprises a support portion that elastically supports and presses against the coil, and a bracket that includes.
- the support portion presses the sensor element against the coil in a direction away from the surface of the fixed region where the fixed portion is fixed in the stator.
- the sensor element in the bracket, the sensor element is inserted into the gap, and the sensor is sensored by the support portion due to the displacement of the fixed portion due to the fixation to the stator from the first posture in which the fixed portion is inclined with respect to the fixed region. It is preferable that the element changes to a second posture in which the element is pressed against the coil.
- a step rising from the fixed region is formed between the fixed portion and the support portion.
- the heat-sensitive body is located on the support portion side of the covering body, and the support portion supports the covering body from the fixed portion side to the support portion side to the position on the fixed portion side of the heat-sensitive body. It is preferable to do.
- the fixing portion is fastened to the case together with the core by a bolt that fixes the core of the stator to the case of the stator.
- the support portion preferably includes a joint portion to be joined to the covering body.
- the bracket preferably includes a locking portion that is locked to the locked portion in order to regulate the rotation of the bracket accompanying the rotation of the bolt that fixes the fixing portion to the stator.
- the electric wire extends between the fixed portion and the locking portion of the bracket.
- the rotary electric machine of the present invention includes a stator including a core and a coil, a rotor rotated with respect to the stator, and the above-mentioned temperature sensor for detecting the temperature of the coil.
- the fixed portion of the bracket can be fixed to the stator, and the sensor element can be pressed against the coil by the elastic force of the support portion as the cantilever of the bracket. Therefore, it is possible to detect the temperature of the coil stably and accurately by the sensor element while preventing the sensor element from shifting from the specified position of the coil or detaching from the coil due to an external force such as vibration or impact. can.
- FIG. 6C It is a perspective view which shows a part of the stator of the rotary electric machine which concerns on embodiment of this invention, and the temperature sensor attached to the stator. It is a figure which shows the state which the temperature sensor inserted in the space formed by the coil of a stator is pressed by the coil from the front end side of the temperature sensor (from the direction of the II arrow of FIG. 6C).
- A is a schematic diagram showing a bracket in a no-load state, a gap formed by a coil, and a case of a stator.
- B) and (c) are schematic views for explaining the mechanism which presses the sensor element inserted into a gap with respect to a coil with displacement of a bracket. It is a perspective view which shows the temperature sensor which concerns on embodiment.
- the temperature sensor comprises a sensor element and a bracket.
- A) is a plan view and a side view of the temperature sensor.
- B) is a side view of the temperature sensor shown from the direction of the Vb arrow of (a).
- (A) to (c) are for explaining the process until the sensor element is pressed against the coil by inserting the sensor element into the gap formed by the coil and then fixing the bracket to the stator with bolts. It is a figure of.
- (A) and (b) are schematic views which show the modification which concerns on a bracket.
- A) and (b) are schematic views which show other modification which concerns on a bracket.
- the temperature sensor 2 shown in FIG. 1 is attached to a stator 10 of a rotary electric machine 1 such as an electric motor, and detects the temperature of the coil 11 of the stator 10.
- the rotary electric machine 1 is mounted on a vehicle such as an electric vehicle.
- the rotary electric machine 1 includes a stator 10, a rotor rotated with respect to the stator 10, and a temperature sensor 2.
- the stator 10 includes a core (not shown) which is a laminated body of a plurality of electrical steel sheets, a case 12 for accommodating the core, and a coil 11 wound around the core and exposed to the outside of the case 12.
- the temperature sensor 2 is inserted into a void 13 which is one of the voids formed by the coil 11 wound in a predetermined repeating pattern on the outside of the case 12, and the coil 11 is inserted. Is pressed against.
- the gap 13 is formed inside, for example, the coil strands 11A and the coil strands 11B that intersect each other.
- the gap 13 extends, for example, along the radial direction of the stator 10. Alternatively, the gap 13 extends along a direction inclined in the circumferential direction of the stator 10 with respect to the radial direction of the stator 10.
- the temperature sensor 2 passes between the coil strands 11A and the coil strands 11B projecting to the outside of the case 12 and the surface 12A of the case 12, from the outer peripheral side of the stator 10 toward the inner peripheral side of the stator 10. It is inserted into the gap 13 and pressed against both the coil strands 11A and 11B.
- the front side in the direction in which the temperature sensor 2 is moved with respect to the stator 10 when the temperature sensor 2 is inserted into the gap 13 formed by the coil 11 is referred to as “front”, and the rear side in the direction is referred to as “rear”.
- the reference numeral F indicates “before” and the reference numeral R indicates “after”.
- the coil 11 side on which the temperature sensor 2 is pressed is referred to as "upper” and the opposite side (case 12 side) is referred to as "lower” with respect to the position of the temperature sensor 2 inserted in the gap 13.
- FIG. 3A schematically shows the temperature sensor 2, the gap 13 formed by the coil 11, and the case 12.
- the temperature sensor 2 in the illustrated state is not inserted in the gap 13. Further, the temperature sensor 2 is not fixed to the case 12.
- the fixed region 12R which is the region where the temperature sensor 2 is fixed in the case 12, is located below the position of the void 13 and is formed flat.
- the fixed region 12R on the case 12 and the pressing region 11R of the coil 11 on which the temperature sensor 2 is pressed are arranged in parallel.
- the pressing region 11R corresponds to the surfaces of the coil strands 11A and 11B facing the gap 13.
- the coil lower region 12C existing below the pressing region 11R does not need to be continuous from the fixed region 12R on the case 12, and does not need to be flat.
- the member is not limited to the case 12, and may be another member of the stator 10.
- the configuration of the temperature sensor 2 will be described with reference to FIGS. 4 and 5.
- the temperature sensor 2 includes a sensor element 20 that detects the temperature, and a bracket 30 that fixes the sensor element 20 to the case 12 and presses the sensor element 20 against the coil 11.
- the sensor element 20 includes a heat sensitive body 21, a pair of electric wires 22 and 23 electrically connected to the heat sensitive body 21, and an electrically insulating coating 24 that encloses a part of the electric wires 22 and 23 and the heat sensitive body 21. I have.
- the covering body 24 is formed in an elongated shape.
- the heat sensitive body 21 is located near the front end of the sensor element 20.
- the electric wires 22 and 23 are connected to electrodes (not shown) provided on the heat sensitive body 21, and are drawn out from the heat sensitive body 21 in the same direction.
- the electric wire 22 includes a first electric wire 221 such as a jumet wire drawn from the heat sensitive body 21 and a second electric wire 222 such as a lead wire connected to the first electric wire 221.
- the second electric wire 222 includes an insulating coating 222A, and the core wire is connected to the first electric wire 221.
- the electric wire 23 also includes a first electric wire 231 and a second electric wire 232 having an insulating coating 232A.
- the second electric wires 222 and 232 are connected to a temperature detection circuit (not shown).
- the covering body 24 covers the entire heat-sensitive body 21 and predetermined areas of the electric wires 22 and 23, and protects the heat-sensitive body 21 and the electric wires 22 and 23 from external forces applied from the outside.
- the covering body 24 extends from a position in front of the heat sensitive body 21 to the rear in a direction in which the electric wires 22 and 23 protrude from the heat sensitive body 21.
- the covering 24 covers the connection points between the first electric wire 221 and the second electric wire 222, and the connection points between the first electric wire 231 and the second electric wire 232.
- the sensor element 20 is inserted into the gap 13 along the longitudinal direction of the covering body 24.
- a predetermined range is inserted into the gap 13 from the front end 24F of the covering body 24 toward the rear. Since the front end 24F is formed into a tapered shape, it can be easily inserted into the gap 13.
- the covering body 24 is formed into a predetermined shape using a material such as fluororesin.
- the fluororesin used for the coating body 24 is, for example, polytetrafluoroethylene (PTFE), tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA), or the like.
- the covering body 24 exhibits a circular cross section at the position of the heat sensitive body 21 in the vicinity of the front end 24F. Behind the heat sensitive body 21, the covering body 24 exhibits a cross section having a shape similar to an ellipse, which is long in the direction in which the electric wires 22 and 23 are arranged.
- the cross section of the covering body 24 is not limited to this embodiment, and may have an appropriate shape such as a rectangular shape.
- the bracket 30 (FIGS. 4 and 5) has a fixing portion 31 fixed to the case 12 of the stator 10 with a bolt 38 (FIG. 1) and a locking portion for locking the bracket 30 to the case 12 when the bolt 38 rotates.
- a portion 32 and a support portion 33 that supports the covering body 24 of the sensor element 20 are provided.
- the electric wires 22 and 23 of the sensor element 20 are pulled out from the rear end of the covering body 24 and extend rearward in the electric wire passing region 39 between the fixing portion 31 and the locking portion 32 in the bracket 30.
- the fixing portion 31, the locking portion 32, and the supporting portion 33 of the bracket 30 are integrally formed by, for example, using a metal plate material such as stainless steel and performing press working such as punching and bending.
- the bracket 30 is not limited to a metal plate material, and may be molded by using an appropriate resin material as long as it has elasticity.
- the fixing portion 31 is fastened to the case 12 by bolts 38 together with a core (not shown) inside the case 12. That is, the bolt 38 is a bolt that fixes the core of the stator 10 to the case 12, and also corresponds to a bolt that fixes the bracket 30 to the case 12.
- the fixing portion 31 is formed with a through hole 310 into which the shaft portion of the bolt 38 used for fastening is inserted.
- the shaft portion of the bolt 38 reaches the core through the through hole 310 and the through hole (not shown) of the case 12.
- the fixing portion 31 is formed in a substantially annular shape, and is arranged in the fixing region 12R (FIG. 3A) which is a seating surface around the through hole of the case 12 by tightening the bolt 38.
- the fixed portion 31 is not limited to an annular shape, but may have an appropriate shape such as a rectangular shape.
- the locking portion 32 is bent toward the back surface side (lower side) with respect to the fixing portion 31 at a position away from the plane center of the through hole 310 in the bracket 30.
- the locking portion 32 is arranged to face the side surface 12B (FIG. 1) of the edge of the case 12 as the locked portion.
- the bracket 30 attempts to be rotationally displaced following the rotation of the right-handed bolt 38 at the time of fastening, the locking portion 32 is locked to the side surface 12B, so that the bracket 30 rotates with the rotation of the bolt 38.
- the member to which the locking portion 32 is locked is not limited to the case 12, and may be an appropriate member to which the locking portion 32 is abutted when the bracket 30 is fastened.
- the support portion 33 elastically supports one end side (front end side) of the sensor element 20 in the longitudinal direction as a cantilever from below, and the sensor element 20 inserted in the gap 13 is oriented away from the surface of the fixed region 12R. That is, the coil 11 is pressed upward.
- the support portion 33 projects laterally from the electric wire passing region 39 and extends along the longitudinal direction of the covering body 24.
- a step 37 rising from the fixed region 12R is formed between the support portion 33 and the fixed portion 31.
- the case 12 and the support portion 33 can be separated from each other by a predetermined distance over the entire length direction of the support portion 33.
- the space 14 (FIG. 3A) between the case 12 and the support portion 33 it is possible to suppress the influence of the temperature of the stator 10 on the sensor element 20 via the support portion 33. can.
- the temperature of the stator 10 is typically lower than the temperature of the coil 11. Further, the heat capacity of the stator 10 is larger than the heat capacity of the coil 11.
- the support portion 33 forms a pressing mechanism 300 in cooperation with the fixing portion 31.
- the fixed portion 31 extends linearly rearward from the step 37, and the support portion 33 linearly extends forward from the step 37.
- the fixing portion 31 and the supporting portion 33 are not in the same straight line or in a parallel relationship, and the other is inclined with respect to one.
- the first extension line L1 drawn rearward from the fixed portion 31 and the second extension line L2 drawn rearward from the support portion 33 intersect at an intersection X located behind the rear end 31B of the fixed portion 31. There is.
- an angle ⁇ corresponding to the positions and dimensions of the fixed region 12R and the pressing region 11R, the directions in which the fixed region 12R and the pressing region 11R extend, and the like are set. Has been done. Depending on the angle ⁇ , the intersection X may be located in front of the rear end 31B.
- the support portion 33 is interlocked with the fixed portion 31 which is pushed down toward the surface 12A of the case 12 by the fastening, and the sensor element is formed by the support portion 33. 20 is sufficiently pressed against the coil 11 from below.
- the support portion 33 includes a support portion main body 34 that supports the covering body 24, and a first joining portion 35 and a second joining portion 36 that are joined to the covering body 24.
- the support portion main body 34 extends from the position of the step 37 to the position on the fixed portion 31 side (rear side) of the heat sensitive body 21.
- the support portion main body 34 is provided with a width corresponding to the width of the rear end side of the covering body 24.
- the support portion main body 34 of the present embodiment supports the covering body 24 from the fixing portion 31 side of the bracket 30 toward the support portion 33 side to a position closer to the fixing portion 31 side (rear side) than the heat sensitive body 21. .. Therefore, although the covering body 24 protrudes forward from the front end 34F of the supporting portion main body 34, the covering body 24 can sufficiently press the covering body 24 against the coil 11 at least in the heat sensitive body 21 and its vicinity on the supporting portion main body 34. A large amount of elastic deformation is secured.
- the support main body 34 is inserted into the gap 13 together with the covering body 24.
- the support portion main body 34 may be coated with a film made of a resin material or the like at least over the range inserted into the gap 13.
- the first joint portion 35 is composed of a pair of joint pieces 35A and 35B crimped in the width direction with respect to the covering body 24 of the sensor element 20.
- the joint pieces 35A and 35B sandwich the sensor element 20 in a state of being bent upward from the support portion main body 34.
- the range in front of the first joint portion 35 in the support portion main body 34 is inserted into the gap 13 with the sensor element 20 supported.
- the second joint portion 36 is arranged on the proximal end side (rear side) of the support portion main body 34 with respect to the first joint portion 35.
- the second joint portion 36 is crimped in the vertical direction with respect to the covering body 24 together with the support portion main body 34.
- the second joint portion 36 is bent upward from the support portion main body 34, and sandwiches the covering body 24 with the support portion main body 34.
- the width of the second joint portion 36 and the step 37 is larger than the width of the support portion main body 34.
- FIGS. 3 (b) and 6 (a) show the posture (reference posture) of the bracket 30 when the fixing portion 31 is parallel to the fixed region 12R as shown in FIG. 3 (a).
- the front end side of the support portion 33 is tilted downward as shown in. In that state, the sensor element 20 and the support portion 33 can be smoothly inserted to a predetermined position in the extending direction of the gap 13 along the direction in which the gap 13 extends.
- the direction in which the bracket 30 is tilted at the time of insertion corresponds to the counterclockwise direction in FIGS. 3 (b) and 6 (a).
- the bracket 30 when the sensor element 20 is located behind the gap 13 is abutted against the surface 12A of the case 12 with the lower end 37A of the step 37 abutting against the surface 12A of the case 12.
- the front end of the sensor element 20 may be positioned with respect to the gap 13.
- the front end side of the support portion 33 is tilted downward with respect to the reference posture of the bracket 30.
- the bracket 30 is moved forward until the position of the through hole 310 of the fixing portion 31 matches the position of the through hole (not shown) of the case 12, and the predetermined position of the gap 13 is reached.
- the sensor element 20 and the support portion 33 can be stably inserted up to.
- the bracket 30 has a first posture P1 in which the fixing portion 31 is tilted with respect to the fixing region 12R of the case 12. It is in. At this time, the rear end 31B of the fixing portion 31 is separated from the case 12. After inserting the sensor element 20 into the gap 13, while the bracket 30 is in the first posture P1, the fixing portion 31 is pushed down by the head 381 of the bolt 38 as shown in FIGS. 6 (b) and 6 (c). The fixing portion 31 is fastened to the fixing region 12R (fixing step).
- the bracket 30 is displaced clockwise (arrow D2) in FIG. 6B so that the fixed portion 31 is parallel to the fixed region 12R, and the bracket 30 is interlocked with the fixed portion 31.
- the sensor element 20 changes from below to the second posture P2 pressed against the pressing region 11R of the coil 11 (FIGS. 6 (c) and 3 (c)). Due to the clockwise displacement at this time, the support portion 33 is elastically deformed, and the elastic force F1 presses the sensor element 20 toward the intersection 11C of the coil strands 11A and 11B as shown in FIG. ..
- the covering body 24 of the sensor element 20 is in close contact with the coil strands 11A and 11B due to the elastic force F1, the sensor element 20 is prevented from being displaced from the pressing region 11R or detached from the coil 11. Further, since the sensor element 20 is thermally coupled to the coil 11 due to the close contact, it can contribute to the improvement of the detection accuracy by the temperature sensor 2. If the shape of the cross section of the sensor element 20 is circular, elliptical, or the like, the shape of the sensor element 20 is similar to the shape of the void 13. In that case, the coil 11 and the sensor element 20 can be brought into close contact with each other over substantially the entire pressing region 11R between the coil strands 11A and the coil strands 11B, except for the minute gap 15 (FIG. 2).
- the varnish used for covering the coil 11 after the temperature sensor 2 is attached to the stator 10 may flow into the gap 15 and solidify. Regardless of the shape of the sensor element 20 and the gap 13, when the covering body 24 of the sensor element 20 is deformed following the shape of the pressing region 11R, the gap 15 is not necessarily formed. By securing a wide area of the heat input region from the pressing region 11R of the coil 11 to the sensor element 20, it is possible to contribute to the improvement of the detection accuracy.
- the fixing portion 31 of the bracket 30 is securely fixed to the stator 10 by the bolt 38, and the elastic force F1 of the support portion 33 as the cantilever beam of the bracket 30 is used.
- the sensor element 20 can be pressed against the coil 11. Therefore, the sensor element 20 stabilizes the temperature of the coil 11 while preventing the sensor element 20 from shifting from the pressing region 11R of the coil 11 or detaching from the coil 11 due to an external force such as vibration or impact. It can be detected with high accuracy.
- stator core By tightening a single bolt 38, the stator core can be assembled to the case 12 and the bracket 30 can be assembled to the case 12 at the same time, so that the work efficiency of assembly is improved and the number of parts is reduced to reduce the cost. It can be suppressed.
- the position of the sensor element 20 is wider than the support portion 33 due to external forces such as vibration and impact. It is restricted to shift in the direction or up and down. Then, since the sensor element 20 is pressed against the coil 11 by the support portion 33 in a state where the posture of the sensor element 20 is stable, it is possible to contribute to the improvement of the detection accuracy.
- the step 37 functions as a guide so that the sensor element 20 and the support portion 33 do not interfere with the coil 11 and the sensor element 20 is inserted into the gap 13. And the support 33 can be inserted stably. Further, due to the presence of the step 37, a predetermined distance is secured over the entire length of the support portion 33 between the case 12 and the support portion 33, so that the heat capacity of the coil 11 is large and the temperature of the coil 11 is higher than that of the coil 11. It is possible to prevent the temperature of the stator 10 having a different temperature from being transmitted to the sensor element 20 through the support portion 33 and affecting the temperature detection. Therefore, the accuracy and responsiveness of temperature detection can be improved.
- the temperature sensor 2 may include, for example, any of the brackets 40 and 50 shown in FIGS. 7A and 7 and the bracket 60 shown in FIG. ..
- the bracket 40 shown in FIG. 7A includes a curved support portion 43.
- the bracket 40 is not formed with a step 37.
- the support portion 43 is connected to the front from the electric wire passing region 39 and is curved in a convex direction with respect to the upper side.
- the support portion 43 extends from the rear end 43B to the front end 43A and is separated from the case 12.
- the sensor element 20 can be fixed to the case 12 and the sensor element 20 can be pressed against the coil 11 by the same procedure as when the bracket 30 of the above embodiment is used. That is, when the sensor element 20 and the support portion 43 are inserted into the gap 13 along the extending direction of the gap 13, and then the fixed portion 31 is fastened to the case 12, the support portion is pushed down toward the fixed region 12R. 43 is interlocked and elastically deformed. Therefore, the sensor element 20 can be pressed against the coil 11 from below by the elastic force of the support portion 43, and the sensor element 20 can be brought into close contact with the wire of the coil 11.
- the support portion 53 of the bracket 50 shown in FIG. 7B has a first section 531 that bends with respect to the electric wire passing region 39 and extends linearly, and a bellows-shaped second section that is connected to the front of the first section 531. It is equipped with 532.
- the first section 531 extends forward from the wire passing region 39 so as to gradually move upward from the fixed region 12R.
- the second section 532 is formed by bending the plate material in a bellows shape in a side view from a direction orthogonal to the paper surface.
- the sensor element 20 can be fixed to the case 12 and the sensor element 20 can be pressed against the coil 11 by the same procedure as when the brackets 30 and 40 are used.
- the support portion 63 of the bracket 60 shown in FIG. 8A includes a step 64 rising from the electric wire passing region 39, and a support portion main body 65 extending forward from the step 64 and extending in parallel with the fixing portion 31. ..
- the height h1 of the step 64 is higher than the height of the step 37 of the above embodiment. Therefore, before the sensor element 20 is inserted into the gap 13, the position of the sensor element 20 supported by the support portion main body 65 is located above the position of the gap 13.
- the elastic force of the step 64 and the support body 65 causes the step 64 and the support body 65 to elastically deform.
- the sensor element 20 can be pressed against the coil 11. By pressing the sensor element 20 by the support portion 63 and fastening the fixing portion 31 to the case 12, it is possible to prevent the sensor element 20 from shifting from the pressing region 11R or detaching from the coil 11. ..
- the bolt 38 that fixes the fixing portion 31 such as the bracket 30 to the case 12 does not necessarily have to be the same as the bolt that fixes the stator core to the case 12. That is, the fixing portion 31 can be fixed to the case 12 or another member provided in the stator 10 by using a bolt different from the bolt for fixing the stator core to the case 12.
- the fixing portion 31 can be fixed to the member of the stator 10 by an appropriate method such as caulking or gluing, not limited to fastening.
- the fixing portion 31 can be fixed to the case 12 by filling the inside of the through hole 310 of the fixing portion 31 and the through hole of the case 12 with a resin material and curing the resin material.
- brackets 30, 40, 50, and 60 described above an appropriate shape including a fixing portion fixed to the stator 10 and a support portion that elastically supports the sensor element 20 and presses against the coil 11. Brackets can be adopted.
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Abstract
Description
本発明は、コイルに対する位置ずれやコイルからの離脱を防止することが可能な温度センサ、およびそれを備えた回転電機を提供することを目的とする。
〔全体構成〕
図1に示す温度センサ2は、電動機等の回転電機1のステータ10に取り付けられ、ステータ10のコイル11の温度を検出する。回転電機1は、例えば電気自動車等の車両に搭載される。回転電機1は、ステータ10と、ステータ10に対して回転されるロータと、温度センサ2とを備えている。
また、空隙13に挿入されている温度センサ2の位置を基準として、温度センサ2が押圧されるコイル11側を「上」と称し、その反対側(ケース12側)を「下」と称する。
典型例としては、ケース12上の固定領域12Rと、温度センサ2が押圧されるコイル11の押圧領域11Rとは平行に配置されている。押圧領域11Rは、空隙13に臨むコイル素線11A,11Bの表面に相当する。
図4および図5を参照し、温度センサ2の構成を説明する。温度センサ2は、温度を検出するセンサ要素20と、センサ要素20をケース12に固定するとともにコイル11に対してセンサ要素20を押圧するブラケット30とを備えている。
センサ要素20は、感熱体21と、感熱体21に電気的に接続される一対の電線22,23と、電線22,23の一部および感熱体21を包む電気絶縁性の被覆体24とを備えている。被覆体24は、長尺状に形成されている。
感熱体21には、温度変化に対して電気抵抗が変化するサーミスタ等が用いられている。感熱体21は、センサ要素20の前端の近傍に位置している。
電線22と同様に、電線23も、第1電線231と、絶縁被覆232Aを備えた第2電線232とからなる。
第2電線222,232は、図示しない温度検出回路に接続される。
空隙13には、被覆体24における前端24Fから後方に向けて所定の範囲が挿入される。前端24Fは、先細り形状に成形されているため、空隙13に挿入され易い。
被覆体24は、前端24Fの近傍の感熱体21の位置において円形の横断面を呈する。感熱体21よりも後方において、被覆体24は、電線22,23が並ぶ方向に長い、楕円形に近似する形状の横断面を呈する。被覆体24の横断面は、本実施形態に限られることなく、例えば矩形状等の適宜な形状であってよい。
ブラケット30(図4および図5)は、ステータ10のケース12にボルト38(図1)で固定される固定部31と、ボルト38の回転時にブラケット30をケース12に係止するための係止部32と、センサ要素20の被覆体24を支持する支持部33とを備えている。センサ要素20の電線22,23は、被覆体24の後端から引き出され、ブラケット30における固定部31と係止部32との間の電線通過領域39を後方へ延びている。
なお、このブラケット30は、金属製の板材に限られず、弾性を有していれば適宜な樹脂材料を用いて成形されることも許容される。
なお、固定部31は、円環状に限らず、矩形状等の適宜な形状であってよい。
なお、係止部32が係止される部材は、ケース12には限らず、ブラケット30の締結時に係止部32が突き当てられる適宜な部材であってよい。
固定部31から後方へ引いた第1延長線L1と、支持部33から後方へ引いた第2延長線L2とは、固定部31の後端31Bよりも後方に位置する交点Xで交差している。第1延長線L1と第2延長線L2との間には、固定領域12Rおよび押圧領域11Rの位置や寸法、固定領域12Rおよび押圧領域11Rがそれぞれ延びている方向等に対応する角度θが設定されている。角度θによっては、交点Xが後端31Bよりも前方に位置していてもよい。
支持部本体34は、締結時に変位する固定部31に連動することで、空隙13に挿入されたセンサ要素20をコイル11に対して十分に押圧するために所定の弾性変形量を得ることが可能な長さに設定される。支持部本体34には、少なくとも感熱体21およびその近傍で被覆体24をコイル11に対して一定以上の荷重により押圧可能な弾性変形量が確保される。
本実施形態の支持部本体34は、ブラケット30の固定部31側から支持部33側に向けて、感熱体21よりも固定部31側(後側)の位置まで被覆体24を支持している。そのため、被覆体24は支持部本体34の前端34Fよりも前方へ突出しているものの、支持部本体34には、少なくとも感熱体21およびその近傍で被覆体24をコイル11に対して十分に押圧可能な弾性変形量が確保されている。
ブラケット30を用いてステータ10に温度センサ2を取り付ける手順を説明する。
図6(a)に示すように、コイル11がなす空隙13に、ステータ10の外周側からセンサ要素20を挿入する(挿入ステップ)。挿入するにあたり、図3(a)に示すように固定部31が固定領域12Rに対して平行であるときのブラケット30の姿勢(基準姿勢)に対し、図3(b)および図6(a)に示すように支持部33の前端側を下方に向けて傾ける。その状態で、センサ要素20および支持部33を空隙13が延びている方向に沿って、空隙13の延出方向における所定の位置までスムーズに挿入することができる。挿入時にブラケット30を傾ける向き(矢印D1)は、図3(b)および図6(a)における反時計回りに相当する。
ケース12に対して下端37Aを摺動させながら、固定部31の貫通孔310の位置がケース12の図示しない貫通孔の位置に一致するまでブラケット30を前方へ移動させると、空隙13の所定位置までセンサ要素20および支持部33を安定して挿入することができる。
空隙13へのセンサ要素20の挿入後、ブラケット30が第1姿勢P1にある状態で、図6(b)および(c)に示すようにボルト38の頭部381により固定部31を押し下げながら、固定部31を固定領域12Rに締結する(固定ステップ)。
センサ要素20の横断面の形状が円形や楕円形等であるならば、空隙13の形状に対してセンサ要素20の形状が類似している。その場合は、微細な隙間15(図2)を除き、コイル素線11Aとコイル素線11Bとの押圧領域11Rにおける略全体に亘りコイル11とセンサ要素20とを密着させることができる。
隙間15には、ステータ10への温度センサ2の取り付け後にコイル11を被覆するために用いられるワニスが流入して固化してもよい。
センサ要素20および空隙13の形状を問わず、センサ要素20の被覆体24が押圧領域11Rの形状に倣って変形する場合は、隙間15は必ずしも形成されない。
コイル11の押圧領域11Rからセンサ要素20への入熱領域の面積を広く確保することにより、検出精度の向上に寄与することができる。
その上、段差37の存在により、ケース12から支持部33までの間に、支持部33の全長に亘り所定の距離が確保されるため、コイル11に対して熱容量が大きく且つコイル11とは温度が異なるステータ10の温度が、支持部33を通じてセンサ要素20に伝わり温度検出に影響を与えることを抑えることができる。そのため、温度検出の精度および応答性を向上させることができる。
温度センサ2は、上記実施形態のブラケット30に代えて、例えば、図7の(a)および(b)に示すブラケット40,50、および図8に示すブラケット60のいずれかを備えていてもよい。
図7(a)に示すブラケット40は、湾曲した支持部43を備えている。ブラケット40には段差37が形成されていない。
支持部43は、電線通過領域39から前方に連なり、上方に対して凸の向きに湾曲している。支持部43は、後端43Bから前端43Aまでに亘り、ケース12から離れている。
つまり、空隙13の延出方向に沿って空隙13にセンサ要素20および支持部43を挿入した後、ケース12に固定部31を締結すると、固定領域12Rに向けて押し下げられる固定部31に支持部43が連動するとともに弾性変形する。そのため、支持部43の弾性力により、センサ要素20を下方からコイル11に対して押圧し、センサ要素20をコイル11の素線に密着させることができる。
このブラケット50によっても、ブラケット30,40を用いる場合と同様の手順により、センサ要素20をケース12に固定するとともに、センサ要素20をコイル11に押圧することができる。
2 温度センサ
10 ステータ
11 コイル
11A,11B コイル素線
11C 交点
11R 押圧領域
12 ケース
12A 表面
12B 側面
12C コイル下領域
12R 固定領域
13 空隙
14 空間
15 隙間
20 センサ要素
21 感熱体
22,23 電線
24 被覆体
24F 前端
30,40,50,60 ブラケット
31 固定部
31B 後端
32 係止部
33,43,53,63 支持部
34,65 支持部本体
34F 前端
35 第1接合部
35A,35B 接合片
36 第2接合部
37 段差
37A 下端
38 ボルト
39 電線通過領域
43A 前端
43B 後端
64 段差
221,231 第1電線
222,232 第2電線
222A,232A 絶縁被覆
300 押圧機構
310 貫通孔
381 頭部
531 第1区間
532 第2区間
F 前
R 後
F1 弾性力
L1 第1延長線
L2 第2延長線
P1 第1姿勢
P2 第2姿勢
X 交点
θ 角度
Claims (10)
- 回転電機のステータに備えられるコイルの温度を検出するための温度センサであって、
感熱体と、前記感熱体に電気的に接続される電線と、前記電線の一部および前記感熱体を包む長尺状の被覆体と、を含み、前記コイルがなす空隙に前記被覆体の長手方向に沿って挿入されるセンサ要素と、
前記ステータに固定される固定部と、前記センサ要素の前記長手方向の一端側を弾性的に支持しつつ前記コイルに対して押圧する支持部と、を含むブラケットと、を備える、温度センサ。 - 前記支持部は、
前記ステータにおいて前記固定部が固定される固定領域の表面から離れる向きに、前記センサ要素を前記コイルに対して押圧する、
請求項1に記載の温度センサ。 - 前記ブラケットは、
前記空隙に前記センサ要素が挿入され、前記固定領域に対して前記固定部が傾斜している第1姿勢から、前記ステータへの固定による前記固定部の変位に伴い前記支持部により前記センサ要素が前記コイルに対して押圧される第2姿勢へと変化する、
請求項2に記載の温度センサ。 - 前記固定部と前記支持部との間には、前記固定領域から立ち上がる段差が形成されている、
請求項2または3に記載の温度センサ。 - 前記感熱体は、前記被覆体における前記支持部側に位置し、
前記支持部は、前記固定部側から前記支持部側に向けて、前記感熱体よりも前記固定部側の位置まで前記被覆体を支持している、
請求項1から4のいずれか一項に記載の温度センサ。 - 前記固定部は、前記ステータのコアを前記ステータのケースに固定するボルトにより、前記コアと共に前記ケースに締結される、
請求項1から5のいずれか一項に記載の温度センサ。 - 前記支持部は、前記被覆体に接合される接合部を含む、
請求項1から6のいずれか一項に記載の温度センサ。 - 前記ブラケットは、
前記ステータに前記固定部を固定するボルトの回転に伴う前記ブラケットの回転を規制するために被係止部に係止される係止部を含む、
請求項1から7のいずれか一項に記載の温度センサ。 - 前記電線は、前記ブラケットにおける前記固定部と前記係止部との間を延びている、
請求項8に記載の温度センサ。 - コアおよびコイルを含むステータと、
前記ステータに対して回転されるロータと、
前記コイルの温度を検出するための請求項1から9のいずれか一項に記載の温度センサと、を備える、回転電機。
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