JP2016123155A - Stator for rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator for a rotary electric machine capable of accurately detecting a coil temperature.SOLUTION: A stator 1 for a rotary electric machine comprises: coils 3 of three phases in which a coolant is supplied to an outer surface of a coil end 3a; and a neutral point bus bar 6 including a clip 63 which is bent in an U shape for holding a temperature sensor 7 to which one end of the coil 3 of each phase is connected, for detecting a temperature of the coils 3. The neutral point bus bar 6 is mounted on an outer surface of the coil end 3a in such a manner that the temperature sensor 7 is prevented from being directly exposed with the coolant and that a part that is bent in the U shape in the clip 63 comes to an upstream side of a flow of the coolant.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a stator for a rotating electrical machine, and more particularly to a stator in which a neutral point bus bar holds a temperature sensor.

  In a rotating electrical machine, when a current flows through a coil wound around a stator, heat is generated in the coil and the coil temperature rises, so that a coolant is supplied to the coil to cool it.

  In addition, a temperature sensor that detects the temperature of the coil is provided to control the current flowing in the coil based on the coil temperature, and if the coil temperature rises above a predetermined temperature, the components that make up the stator may be damaged by heat Therefore, there are cases where control such as cutting off the current to the coil is performed.

  Regarding the mounting of the temperature sensor, the end of the neutral point bus bar that electrically connects the U-phase, V-phase, and W-phase coils is bent into a U shape, and the temperature sensor is attached to the U-shaped bent portion. A configuration for sandwiching and holding is known (for example, see Patent Document 1).

JP 2013-225959 A

  In the configuration described in Patent Document 1, since the position of the temperature sensor and the direction in which the refrigerant is supplied are not defined, the refrigerant may easily hit the temperature sensor depending on how the refrigerant is supplied. If the coolant is likely to hit the temperature sensor, the temperature of the temperature sensor will be lower than that of the coil, making it difficult to accurately detect the coil temperature.

  Accordingly, an object of the present invention is to provide a stator for a rotating electrical machine that accurately detects a coil temperature.

  A stator of a rotating electrical machine of the present invention is a stator of a rotating electrical machine including a three-phase coil in which a refrigerant is supplied to the outer surface of a coil end, and a neutral point bus bar to which one end of each phase coil is connected, The neutral point bus bar includes a U-shaped clip that holds a temperature sensor that detects the temperature of the coil at one end, and the U-shaped portion of the clip is the flow of the refrigerant. It is attached to the outer surface of the said coil end so that it may become an upstream.

  According to the present invention, the coil temperature can be accurately detected.

It is a schematic block diagram of a stator. It is a connection diagram of a three-phase coil It is an enlarged view of the attachment part of a neutral point bus bar. It is a perspective view of a neutral point bus bar. It is a schematic front view of a stator and a refrigerant supply device. It is a schematic side view of a stator and a refrigerant supply device. It is a perspective view which shows the modification of a neutral point bus bar.

  The rotating electrical machine in the present embodiment is used for a motor generator of a hybrid vehicle. As shown in FIG. 1, a stator 1 of a rotating electrical machine includes a stator core 2 and a stator coil 3 wound around the stator core 2. The stator core 2 includes an annular yoke 2a and a plurality of teeth provided at equal intervals in the circumferential direction on the inner peripheral surface of the yoke 2a. A conductive wire is wound around each tooth via an insulating member. This insulating member insulates the stator coil 3 and the stator core 2.

  The stator coil 3 is configured by concentrated winding a conducting wire made of a rectangular wire. The surface of the flat wire is enameled to ensure insulation between adjacent flat wires. The stator coil 3 includes a W-phase coil 3W, a U-phase coil 3U, and a V-phase coil 3V. Each of the phase coils 3W, 3U, and 3V includes single coils W1 to W5, U1 to U5, and V1 to V1. Consists of V5. Single coils W1-W5, U1-U5, and V1-V5 are comprised by winding the conducting wire which consists of a flat wire around one tooth. Each single coil W1-W5, U1-U5, V1-V5 is each arrange | positioned at the teeth so that it may be repeated in the circumferential direction.

  Input terminals 5W, 5U, and 5V are connected to the other ends of the respective phase coils 3W, 3U, and 3V configured by connecting a plurality of in-phase single coils W1 to W5, U1 to U5, and V1 to V5. ing. An inverter (not shown) that outputs three-phase AC power is connected to the input terminals 5W, 5U, and 5V.

  As shown in FIG. 2, each one end of each phase coil 3W, 3U, 3V is mutually joined, and comprises a neutral point. The phase coils 3W, 3U, 3V are connected in parallel between the input terminals 5W, 5U, 5V and the neutral point, and are 2Y-connected (parallel star connection). That is, in the W-phase coil 3W, the single coils W1 to W5 are divided into two sets, and each set is connected in parallel. In order to divide the single coils W1 to W5 into two sets, for example, based on the specifications of the rotating electrical machine, for example, the single coils W1 to W3 are divided into a series connected and the single coils W4 and W5 are divided into a series connected. . Or it divides | segments into the group which connected the single coils W1-W3 in parallel, and the group which connected the single coils W4 and W5 in parallel. The same applies to the other single coils U1 to U5 and V1 to V5. The number of coils is not limited to five.

  As shown in FIG. 3, a neutral point bus bar 6 to which one end of each phase coil 3W, 3U, 3V is connected is fixed to the outer peripheral surface of the coil end 3a by welding. As shown in FIGS. 3 and 4, the neutral point bus bar 6 includes a band-shaped main body portion 61 curved with a curvature along the outer peripheral surface of the coil end 3 a, one end portion 61 a on the side surface in the longitudinal direction of the main body portion 61, A plurality of terminals 62 bent and extended from the part 61b and the other end part 61c, and a clip 63 bent in a U shape at one end part 61a of the main body part 61 are provided. The neutral point bus bar 6 is made of a flat conductive wire made of a metal having excellent conductivity and thermal conductivity, for example, copper. By punching or bending the flat wire, the main body 61, the terminal 62, and the clip 63 are formed. Although the clip 63 is integrally formed with the neutral point bus bar 6, the clip 63 may be attached to the neutral point bus bar 6 as a separate body.

  The plurality of terminals 62 include two terminals 62W1 and 62W2 respectively corresponding to two sets obtained by dividing the W-phase coil 3W into two parts, and two terminals 62U1 corresponding respectively to two sets obtained by dividing the U-phase coil 3U into two parts. , 62U2 and two terminals 62V1 and 62V2 respectively corresponding to two sets of the V-phase coil 3V divided into two. Since the main body 61 includes six terminals 62W1, 62W2, 62U1, 62U2, 62V1, and 62V2, the band-like portion of the main body 61 is set widely with respect to the widths of these terminals to maintain strength.

  The clip 63 sandwiches and holds a temperature sensor 7 that detects the temperature of the stator coil 3. When a gap is generated between the clip 63 and the temperature sensor 7 when the temperature sensor 7 is sandwiched between the clips 63, the temperature sensor 7 is fixed by filling with resin.

  The temperature sensor 7 includes a thermistor element 7a that detects the temperature of the stator coil 3 via a neutral point bus bar 6, and a lead wire 7b that extends from the thermistor element 7a. The lead wire 7b is connected to a control unit (not shown), and temperature information of the stator coil 3 detected by the thermistor element 7a is transmitted to the control unit and used for current control to the stator coil 3 and the like.

  As shown in FIGS. 5A and 5B, the stator 1 is mounted on the vehicle so that the rotation axis L thereof is substantially horizontal. Above the stator 1, a cooling pipe 10 for supplying cooling oil as a refrigerant to the stator coil 3 to the coil end 3a is disposed. At a position facing the coil end 3a of the stator coil 3 of the cooling pipe 10, a discharge port 10a for discharging cooling oil toward the outer peripheral surface of the coil end 3a is provided. The cooling pipe 10 is connected to a refrigerant supply pump (not shown).

  When the cooling oil is pumped to the cooling pipe 10 by the refrigerant supply pump, as shown by an arrow A in the figure, the cooling oil is placed on the upper outer peripheral surface of the coil end 3a from the discharge port 10a of the cooling pipe 10 toward the coil end 3a. Supplied to pour down. The cooling oil travels along the inner and outer peripheral surfaces of the coil end 3a, flows on the lower outer peripheral surface of the coil end 3a, and flows down to an oil pan (not shown).

  Next, the direction of the clip 63 when fixing the neutral point bus bar 6 will be described. As shown in FIGS. 5A and 5B, the neutral point bus bar 6 is fixed at a position where a horizontal plane H passing through the rotation axis L intersects with the outer peripheral surface of the coil end 3a. As described above, when the cooling oil is supplied from above the stator 1 to the outer peripheral surface of the coil end 3a, the clip 63 is in the direction in which the cooling oil is supplied, that is, the upstream side where the cooling oil flows. The neutral point bus bar 6 is fixed to the outer peripheral surface of the coil end 3a so as to face. In other words, the direction of the clip 63 is regulated so that the cooling oil falls from the U-shaped portion of the clip 63, and the neutral point bus bar 6 is fixed to the outer peripheral surface of the coil end 3a.

  5A, the neutral point bus bar 6 also has a U-shape of the clip 63 when the neutral point bus bar 6 is disposed on the upper outer peripheral surface of the coil end 3a with respect to the horizontal plane H passing through the rotation axis L. The neutral point bus bar 6 is attached so that the bent portion faces the direction in which the cooling oil is supplied.

  Further, in FIG. 5A, as shown by the alternate long and short dash line, the cooling oil is coiled even when the neutral point bus bar 6 is disposed on the lower outer peripheral surface of the coil end 3a with respect to the horizontal plane H passing through the rotation axis L. Since the cooling oil may hit the temperature sensor 7 through the outer peripheral surface and the inside of the end 3a and flowing below the stator coil 3, the cooling oil flows at the portion of the clip 63 bent into a U shape. The neutral point bus bar 6 is attached so as to face the upstream side.

  As described above, even when the cooling oil is supplied to the outer peripheral surface of the coil end 3a, the cooling oil comes into contact with the U-shaped portion of the clip 63 and is prevented from directly hitting the temperature sensor 7. Is done. Further, it is possible to prevent the cooling oil transmitted along the outer peripheral surface of the coil end 3 a from directly hitting the temperature sensor 7. Therefore, the temperature of the temperature sensor 7 is suppressed from lowering than that of the stator coil 3 and the neutral point bus bar 6, and the temperature of the stator coil 3 and the neutral point bus bar 6 cooled by the cooling oil can be accurately detected. it can.

  When each phase coil 3W, 3U, 3V is connected in 2Y, normally, a neutral point bus bar is used for each 1Y connection. However, in the embodiment described above, each phase coil connected in 2Y to the neutral point bus bar 6 is used. Since the terminals 62U1, 62U2, 62V1, 62V2, 62W1, and 62W2 corresponding to the terminals of 3W, 3U, and 3V are provided, one neutral point bus bar 6 can be used, and this neutral point bus bar is also supported. Since the temperature can be detected by the single temperature sensor 7 held by 6, the size and cost can be reduced.

  Next, a modified example of the neutral point bus bar will be described. As shown in FIG. 6, the clip 83 of the neutral point bus bar 8 is formed in a wide shape wider than the width of the band-shaped main body portion 81. The clip 83 may be formed by punching so as to have a wide shape when forming the neutral point bus bar 8, or after forming the clip 63 shown in FIG. It is good also as a wide shape by extending. Thus, by making the clip 83 holding the temperature sensor 7 wide, it is possible to further suppress the cooling oil from falling on the temperature sensor 7.

  1 stator, 2 stator core, 2a yoke, 3 stator coil, 3W, 3U, 3V phase coil, 3a coil end, 5W, 5U, 5V input terminal, 6, 8 neutral point bus bar, 7 temperature sensor, 7a thermistor element, 7b Lead wire, 10 Cooling pipe, 10a Discharge port, 61 Main body part, 61a One end part, 61b Center part, 61c Other end part, 62 terminal part, 62U1, 62U2, 62V1, 62V2, 62W1, 62W2 terminal, 63, 83 clips .

Claims (1)

A stator of a rotating electrical machine including a three-phase coil to which a refrigerant is supplied to the outer surface of a coil end, and a neutral point bus bar to which one end of each phase coil is connected,
The neutral point bus bar includes a U-shaped clip that holds a temperature sensor that detects the temperature of the coil at one end, and the U-shaped portion of the clip is the flow of the refrigerant. A stator for a rotating electrical machine, wherein the stator is attached to an outer surface of the coil end so as to be on the upstream side.

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