JP6243310B2 - Stator coil temperature sensor fixing structure - Google Patents

Description

  The present invention relates to a structure for fixing a temperature sensor to a stator coil of a rotating electrical machine.

  Conventionally, for example, in Patent Literature 1, a neutral member that electrically connects U-phase, V-phase, and W-phase coils is used with a fixing member in a state where a temperature sensor is sandwiched between U-shaped bent portions. A fixed stator for a rotating electric machine is disclosed.

JP 2013-225959 A

  When a rotating electrical machine is mounted on a vehicle as a power source, the direction in which a lead wire extending from a temperature sensor attached to a stator coil may differ depending on the vehicle structure. Therefore, when the connector position to which the lead wire extending from the temperature sensor is to be connected is at a position far from the stator circumferential direction (that is, a position separated by a half or more in the circumferential direction of the stator), the lead wire routing distance is There is a problem that it becomes long and expensive, and the lead wire routing work becomes complicated.

  An object of the present invention is to provide a stator coil temperature sensor fixing structure capable of shortening the lead wire arrangement distance to a half or less of the stator regardless of the connector position.

The stator coil temperature sensor fixing structure according to the present invention includes a neutral wire that constitutes a neutral point of the stator coil, a temperature sensor that detects the temperature of the stator coil, and a temperature detector of the temperature sensor. A stator coil temperature sensor fixing structure including a fixing member for fixing to a neutral wire, wherein the neutral wire has a temperature-sensitive coil portion bent in a U shape along the circumferential direction of the stator, The fixing member includes a main body integrally fixed in a state where the temperature detection unit of the temperature sensor is sandwiched and held by the temperature sensing coil unit of the neutral wire, and an extension direction of the lead wire extending from the temperature detection unit the is intended to include a lid member detachably attached to the main body so as to hold along the lead wire is routed by folding in the opposite direction to the surface of the body.

  According to this configuration, when the connector position to which the lead wire of the temperature sensor is connected is far from the temperature detection portion of the temperature sensor with respect to the circumferential direction of the stator, the lead wire is folded back in the direction opposite to the extending direction. Thus, the wiring distance of the lead wire can be shortened. On the other hand, when the connector position is located close to the circumferential direction of the stator along the lead wire extending direction, the lead wire may be routed along the extending direction without being folded back. Can be omitted. Therefore, in any case, the wiring distance of the lead wire of the temperature sensor can be shortened regardless of the connector position, and the cost can be reduced and the wiring work of the lead wire can be facilitated.

  When the lead wire is folded and routed, the lead wire is held along the surface of the main body of the fixing member by the lid member that is detachably attached to the main body of the fixing member. There is no contact with the stator core or the like. Therefore, it is possible to prevent the folded portion of the lead wire from being rubbed and damaged by the stator core or the like due to vibration or the like.

  In the temperature sensor fixing structure of the stator coil according to the present invention, the main body of the fixing member is provided with a plurality of protrusions that protrude from the lid member attached so as to cover the lead wire, and the protrusions Each of the end surfaces may constitute a positioning surface that comes into contact with a positioning jig when the neutral wire is connected and fixed to the stator coil.

  According to this configuration, the surface of the fixing member on which the lid member is attached can be used as a positioning surface of the neutral wire positioning jig, and as a result, the jig can be stably attached to the fixing member. Thus, the neutral wire can be accurately positioned.

  According to the temperature sensor fixing structure of the stator coil according to the present invention, the lead wire routing distance can be shortened to a half or less of the stator regardless of the connector position, thereby reducing the cost and facilitating the lead wire routing operation. I can plan.

It is a perspective view which shows the stator of the rotary electric machine containing the temperature sensor fixing structure which is embodiment which concerns on this invention. It is an expansion perspective view which shows a mode that each coil is wound around the teeth of the some split core which comprises the stator core of the stator of FIG. It is a connection diagram of each coil in the stator of FIG. It is an enlarged view of the neutral point connection member, temperature sensor, and fixing member which constitute the temperature sensor fixing structure of this embodiment. In this embodiment, it is a figure which shows a mode that the neutral point connection member is attached to the neutral point terminal of each coil. It is the top view which looked at a mode that the temperature sensor was connected to the neutral point connection member by the fixing member from the A direction shown in FIG. It is the perspective view which looked at a mode that the temperature sensor is being fixed to the neutral point connection member with the fixing member from the B direction shown in FIG. (A) is the perspective view seen from the opposite side to Drawing 7 showing the state where the temperature sensor is attached to the neutral point connection member by the fixing member, (b) removes the lid member from the main body of the fixing member FIG.

  Embodiments will be described in detail below with reference to the drawings. Similar elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a diagram illustrating a stator 10 of a rotating electrical machine including a temperature sensor fixing structure 24 according to an embodiment of the present invention. Stator 10 includes a stator core 11, a stator coil 12 (U-phase annular coil 12 </ b> U, V-phase annular coil 12 </ b> V, and W-phase annular coil 12 </ b> W), and a temperature sensor fixing structure 24. Among these, the temperature sensor fixing structure 24 includes a neutral point connecting member 40 that forms a neutral point of the stator coil 12, and a temperature sensor (not shown) that detects the temperature of the stator coil 12 at the neutral point connecting member 40. And a fixing member (not shown) that integrally fixes the temperature sensor to the neutral wire connecting member 40. The temperature sensor and the fixing member that are not shown in FIG. 1 will be described in detail later.

  FIG. 2 is an enlarged perspective view showing a state in which the coils 30 are wound around the teeth 28a of the plurality of divided cores 28 constituting the stator core 11. FIG. The plurality of divided cores 28 are annularly arranged along the circumferential direction of the stator 10 so that the teeth 28 a face the radially inner side of the stator 10. As shown in FIG. 2, a coil 30 is wound around the teeth 28 a of the plurality of split cores 28. The coil 30 is made of a metal having excellent conductivity and thermal conductivity, such as copper. The coil 30 is covered with an insulating member made of an enamel resin or the like made of polyamideimide or the like, except for both ends. Both ends of each coil 30 are drawn out on a coil end 32 as each connection terminal 34 used for connecting the coils 30 to each other. The stator core 11 may be configured by laminating a number of electromagnetic steel sheets punched into an annular shape in the axial direction.

  FIG. 3 is a diagram illustrating a connection relationship between the coils 30. In the present embodiment, each coil 30 is assigned to U-phase coil 30U, V-phase coil 30V, and W-phase coil 30W. Here, the total of the U-phase coil 30U, the V-phase coil 30V, and the W-phase coil 30W will be described as 15. However, of course, other numbers may be used. In the following, no. 1-No. The description will be made assuming that the 15 coils 30 are arranged along the circumferential direction of the stator 10.

  The U-phase coil 30U is No. 3, no. 6, no. 9, no. 12, no. 15 is arranged at a position corresponding to 15. And U phase connection terminal 34U of U phase coil 30U is connected in series by U phase connection member 20U, respectively, and U phase annular coil 12U wound around teeth 28a of stator core 11 is formed. At this time, one end of the U-phase annular coil 12U is drawn out as a U-phase input terminal 36U, and the other end of the U-phase annular coil 12U is drawn out as a U-phase neutral point terminal 38U.

  The V-phase coil 30V is No. 2, no. 5, no. 8, no. 11, no. 14 at a position corresponding to 14. The W-phase coil 30W is No. 1, no. 4, no. 7, no. 10, no. 13 is arranged at a position corresponding to 13. Similarly to the U-phase coil 30U, the V-phase connection terminal 34V and the W-phase connection terminal 34W of each V-phase coil 30V and each W-phase coil 30W are connected in series by the V-phase connection member 20V and the W-phase connection member 20W, respectively. By being connected, the V-phase annular coil 12V and the W-phase annular coil 12W wound around the teeth 28a of the stator core 11 are formed.

  Each phase input terminal connecting member (not shown) has one end connected to U-phase input terminal 36U, V-phase input terminal 36V, and W-phase input terminal 36W, and the other end outputs three-phase AC power. It is connected to an inverter (not shown).

  The neutral point connection member 40 constituting a part of the temperature sensor fixing structure 24 is disposed on the coil end 32 of each coil 30. The neutral point connection member 40 is made of a metal having excellent conductivity and thermal conductivity, such as copper. The neutral point connection member 40 integrally includes a UV phase neutral point connection portion 42 and a VW phase neutral point connection portion 44.

  UV phase neutral point connecting portion 42 has one end connected to U-phase neutral point terminal 38U and the other end connected to V-phase neutral point terminal 38V. VW-phase neutral point connection 44 has one end connected to W-phase neutral point terminal 38W and the other end connected to V-phase neutral point terminal 38V, that is, the other end of UV-phase neutral point connection 42. The A temperature sensor is attached to the VW-phase neutral point connection portion 44 of the neutral point connection member 40 by a fixing member.

  FIG. 4 is a perspective view of the neutral point connecting member 40, the temperature sensor 54, and the fixing member 60 constituting the temperature sensor fixing structure 24 of the present embodiment. FIG. 5 is a view showing a state in which the neutral point connecting member 40 is connected and fixed to each neutral point terminal 38. FIG. 6 is a plan view of the temperature sensor 54 fixed to the neutral point connecting member 40 by the fixing member 60 as viewed from the direction A (see FIG. 4).

  As described above, the neutral point connection member 40 includes the UV phase neutral point connection portion 42 and the VW phase neutral point connection portion 44. In the present embodiment, the UV phase neutral point connection portion 42 and the VW phase neutral point connection portion 44 are formed by bending one flat conductive wire.

  As shown in FIG. 6, the UV-phase neutral point connecting portion 42 has a main body portion 42a extending between the U-phase neutral point terminal 38U and the V-phase neutral point terminal 38V, and substantially perpendicular to the main body portion 42a. It has the 1st extending | stretching part 42b and the 2nd extending | stretching part 42c each bent in the substantially S shape toward the direction.

  The VW-phase neutral point connecting portion 44 includes a main body portion 44a extending between the V-phase neutral point terminal 38V and the W-phase neutral point terminal 38W, and a substantially S toward the substantially vertical direction from the main body portion 44a. It has the 1st extending part 44b and the 2nd extending part 44c bent in the shape of a letter. The second extending portion 44 c of the VW phase neutral point connecting portion 44 is bent and continuous with the second extending portion 42 c of the UV phase neutral point connecting portion 42. Furthermore, the VW-phase neutral point connecting portion 44 has a temperature-sensitive coil portion 44d that is bent in a U shape along the circumferential direction of the stator between the main body portion 44a and the first extending portion 44b. The temperature sensing coil portion 44d is a portion for holding the thermistor element 54a, which is the temperature detection portion of the temperature sensor 54, in close contact with it.

  The temperature sensor 54 has a function of detecting the temperature of the stator coil 12 via the neutral point connecting member 40. The temperature sensor 54 includes a thermistor element 54a attached to the temperature sensing coil part 44d of the VW phase neutral point connection part 44, a lead wire 54b extending from the thermistor element 54a, and a covering material 54c covering the lead wire 54b. And a terminal 54d attached to the end of the lead wire 54b. The thermistor element 54a is formed, for example, by mixing and sintering oxides such as nickel, manganese, cobalt, iron, etc., and temperature detection that detects the temperature by utilizing the linear relationship between temperature and resistance. Part. Two lead wires 54b extend from the thermistor element 54a in the stator circumferential direction (see FIG. 7), and a terminal 54d is connected to the end thereof. The terminal 54d of the lead wire 54 is a signal output terminal connected to the stator 10 or a connector (not shown) provided in the vicinity thereof when the temperature sensor fixing structure 24 is incorporated in the stator 10 to constitute a rotating electrical machine. It is.

  In the stator 10 of the rotating electrical machine described above, when the coil temperature of at least one of the U-phase annular coil 12U, the W-phase annular coil 12W, and the V-phase annular coil 12V rises, The temperature rise also rises. As a result, the temperature increase of the stator coil 12 can be detected by the temperature sensor 14. The temperature of the stator coil 12 detected by the temperature sensor 14 is transmitted to the outside from the terminal 54d of the lead wire 54b, and is used, for example, for controlling the current flowing through the stator coil 12.

  Next, the fixing member 60 of the temperature sensor fixing structure 24 will be described with reference to FIGS. 7 and 8. FIG. 7 is a perspective view of the state in which the temperature sensor 54 is attached to the neutral point connection member 40 by the fixing member 60 as viewed from the B direction (see FIG. 4). FIG. 8A is a perspective view seen from the side opposite to FIG. 7 showing a state in which the temperature sensor 54 is attached to the neutral point connecting member 40 by the fixing member 60. FIG. 8B is a perspective view showing a state in which the lid member 64 is removed from the main body 62 of the fixing member 60.

  The fixing member 60 includes a main body 62 that integrally fixes the thermistor element 54a of the temperature sensor 54 to the neutral point connecting member 40, and a lid member 64 that covers and holds the lead wire 54b.

  In the following description, of each side surface portion of the main body 62, the side surface portion from which the lead wire 54b and the main body portion 44a of the VW-phase neutral point connection portion 44 protrude is referred to as the right side surface portion 162, and the opposite side surface is the left side surface portion. 164. In the main body 62 of the fixing member 60, the side surface from which the first extending portion 44 b of the VW phase neutral point connection portion 44 protrudes is referred to as an upper side surface portion 166, and the opposite side surface is referred to as a lower side surface portion 168. Note that the expressions “right”, “left”, “upper”, and “lower” in each side portion are for easy understanding, and do not define the direction in the actual use state.

  The main body 62 of the fixing member 60 is formed in a substantially rectangular parallelepiped shape. The main body 62 has four columnar protrusions 62 a, one T-shaped protrusion 62 b, and a recess 62 c in the lower side surface 168. The four columnar protrusions 62a are disposed two on each side in the direction perpendicular to the longitudinal direction from the substantially central portion of the lower side surface portion 168 to the position near the right side surface portion 162. A region surrounded by these four projecting portions 62a is a storage portion 62c that stores a folded lead wire 54b as will be described later.

  As shown in FIG. 8B, the T-shaped projecting portion 62b is formed to project to the center of the end portion of the lower side surface portion 168 on the left side surface portion 164 side. In the storage portion 62c, two lead wires 54b extending from the right side surface portion 162 of the main body 62 are stored in a state of being folded back in the direction opposite to the extending direction (arrow C direction). The two lead wires 54b are engaged with the T-shaped projecting portion 62b so as to be routed along the surface of the housing portion 62c of the main body 62.

  On the other hand, the lid member 64 is detachably attached to the lower side surface portion 168 of the main body 62. The lid member 64 is a cover member that covers and protects the folded portion of the lead wire 54 b and holds the lead wire 54 b along the surface of the main body 62.

  Next, manufacture and assembly of the temperature sensor fixing structure 24 having the above configuration will be described. First, the thermistor element 54a of the temperature sensor 54 is assembled and held in the temperature sensing coil portion 44d of the VW-phase neutral point connecting portion 44 of the neutral point connecting member 40. Next, the temperature sensitive coil portion 44d of the neutral point connecting member 40 and the thermistor element 54a are arranged inside the mold, and injection molding is performed, for example, by injecting epoxy resin or the like and curing. As a result, the main body 62 is formed around the temperature sensing coil portion 44d and the thermistor element 54a, and the thermistor element 54a is integrally fixed to the neutral point connecting member 40.

  Next, the lead wire 54 b extending from the main body 62 of the fixing member 60 is folded back in the direction opposite to the extending direction (arrow C direction, the same applies hereinafter), and stored in the storage portion 62 c of the lower side surface portion 168. Then, the two lead wires 54b are respectively engaged and routed under the projecting portion of the T-shaped protruding portion 62b, and then the lid member 64 is covered so as to cover the lead wire 54b stored in the storage portion 62c. Is attached to the main body 62. Thereby, the temperature sensor fixing structure 24 in which the temperature sensor 54 is integrally fixed to the neutral point connecting member 40 is completed. Thereafter, as shown in FIG. 6, the extending portions 42b, 44b, 44c (42c) of the neutral point connecting member 40 are connected and fixed to the neutral point terminals 38 of the respective phase annular coils 12U, 12V, 12W by welding or the like. .

  In the temperature sensor fixing structure 24 of the present embodiment assembled to the stator 10 as described above, when the connector position for connecting the lead wire 54b of the temperature sensor 54 is far from the thermistor element 54a in the circumferential direction of the stator 10, By routing the lead wire 54b in the direction opposite to the extending direction, the routing distance of the lead wire 54b can be shortened. On the other hand, when the connector position is located close to the circumferential direction of the stator along the extending direction of the lead wire 54b, the lead wire 54b may be routed along the extending direction without being folded back. The lid member 64 can be omitted. Therefore, in any case, the wiring distance of the lead wire 54b of the temperature sensor 54 can be shortened to a half or less of the stator 10 regardless of the connector position, and the cost reduction and the lead wire wiring work can be facilitated.

  When the lead wire 54b is folded and routed, the lead wire 54b is held along the surface of the main body 62 of the fixing member 60 by the lid member detachably attached to the main body 62 of the fixing member 60. The folded portion of the line 54b does not contact the stator core or the like around it. Therefore, it is possible to prevent the folded portion of the lead wire 54b that is exposed without being covered with the covering material 54c from being rubbed and damaged by vibration or the like on the surrounding stator core or the like.

  Subsequently, the positioning function of the fixing member 60 will be described. The neutral point connecting member 40 to which the fixing member 60 is attached is fixed to each neutral point terminal 38 as described above, for example, by processing such as welding. At this time, the projecting height from the lower side surface portion 168 is set so that the end surfaces 160 of the columnar projecting portion 62a and the T-shaped projecting portion 62b of the fixing member 60 are located in the same plane. On the other hand, the lid member 64 is formed so as not to protrude from the columnar projecting portions 62a and the T-shaped projecting portions 62b in a state where the lid member 64 is mounted on the lower side surface portion 168 of the main body 62. In other words, the protrusion height of each protrusion 62a, 62b is set to be higher than that of the lid member 64.

  Thereby, when each end surface 160 of each columnar protrusion 62a and T-shaped protrusion 62b welds the neutral point connection member 40 to each neutral point terminal 38 of each phase annular coil 12U, 12V, 12W, etc. It can be used as a positioning surface that comes into contact with the neutral wire positioning jig to be used. Further, the right side surface portion 162 and the left side surface portion 164 of the main body 62 can also be used as the positioning surface of the jig. For this reason, a jig | tool can be attached to the fixing member 60 in the stable state by contact | abutting on three different surfaces 160,162,164. As a result, the neutral point connecting member 40 can be accurately positioned with respect to the stator 10 using this jig, and the neutral point connecting member 40 can be positioned at each neutral point of each phase annular coil 12U, 12V, 12W. The terminal 38 can be accurately fixed by welding.

  In the present embodiment, with respect to the main body 62 of the fixing member 60, three of the right side surface portion 162, the left side surface portion 164, and the plane formed by each end surface 160 of the columnar protruding portion 62a and the T-shaped protruding portion 62b are combined. Although the example which utilizes a different surface as a positioning surface of a jig | tool was demonstrated, it is not limited to this. For example, three surfaces of combinations other than those described above may be used as the jig positioning surface, or the jig may be positioned using only two surfaces.

  Further, in this embodiment, the fixing member 60 has a total of five projecting portions including the four columnar projecting portions 62a and the T-shaped projecting portion 62b. Although the example which makes a positioning surface is given, you may change suitably the number of protrusions, shape, and size.

  10 Stator, 11 Stator Core, 12 Stator Coil, 30U U Phase Coil, 30V V Phase Coil, 30W W Phase Coil, 24 Temperature Sensor Fixing Structure, 40 Neutral Point Connection Member (Neutral Wire), 42 UV Phase Neutral Point Connection Part, 44 VW phase neutral point connection part, 44d temperature sensing coil part, 54 temperature sensor, 54a thermistor element, 54b lead wire, 54c coating material, 54d terminal, 60 fixing member, 62 main body, 62a columnar protrusion, 62b T A character-like protruding part, 62c storage part, 64 lid member.

Claims (1)

A neutral wire constituting the neutral point of the stator coil;
A temperature sensor for detecting the temperature of the stator coil;
A temperature sensor fixing structure of a stator coil, comprising: a fixing member that fixes a temperature detection portion of the temperature sensor to a neutral wire of the stator coil,
The neutral wire has a temperature-sensitive coil portion bent in a U shape along the circumferential direction of the stator,
The fixing member includes a main body integrally fixed in a state where the temperature detection unit of the temperature sensor is sandwiched and held by the temperature sensing coil unit of the neutral wire, and an extension direction of the lead wire extending from the temperature detection unit A lid member that is detachably attached to the main body so as to hold the lead wire folded and routed in the opposite direction along the surface of the lead wire storage portion of the main body.
Stator coil temperature sensor fixing structure.

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