JP2019037028A - Rotary electric machine stator - Google Patents

Abstract

To suppress cost in the case of parallel connection of winding coils in a rotary electric machine stator.SOLUTION: A rotary electric machine stator 10 comprises: a stator core 12; and a phase coil formed by successively connecting, in accordance with a predetermined connection method, multiple segment coils 22 which are inserted over a predetermined slot 18 of the stator core and wound around teeth 16. Further, the rotary electric machine stator comprises a metal plate 40 for electrically connecting multiple phase coils of the same phase in parallel with each other. The rotary electric machine stator then comprises multiple lead terminals for power line that are pulled out of the phase coils of the same phase, the multiple lead terminals being connected to the metal plate at a further peripheral side of an outer peripheral edge of a back yoke 14 of the stator core. The rotary electric machine stator also comprises a phase power line 50 being fixed to the metal plate by caulking.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a rotating electrical machine stator, and more particularly, to a rotating electrical machine stator having stator coils connected in parallel.

  In a three-phase rotating electrical machine, by using a plurality of winding coils connected in parallel for each phase winding, the conductor cross-sectional area per one winding coil in parallel connection can be reduced according to the number of parallel connections. For example, Patent Literature 1 describes an example in which U-phase windings are configured by connecting four coils of U1 coil, U2 coil, U3 coil, and U4 coil, which are concentrated winding, in parallel. In this case, four U1 coils, U2 coils, U3 coils, and U4 coils having a conductor cross-sectional area that is 1/4 of the conductor cross-sectional area of one U-phase winding are simultaneously joined and connected in parallel. A phase winding is formed.

  As a technique related to the present disclosure, Patent Document 2 describes, as a conventional technique, that a stator is formed by inserting a plurality of segment coils into each slot of a stator core.

JP 2003-189525 A Japanese Patent Laying-Open No. 2015-136831

  In order to perform parallel connection in which a plurality of winding coils of a rotating electrical machine stator are connected in parallel and connected to one power line, parts for parallel connection and a connection process thereof are required. In particular, when a winding coil is formed using a segment coil, the segment coil is routed through an intermediate member such as a bus bar, resulting in an increase in cost due to an increase in the number of parts and welding locations. Therefore, there is a demand for a rotating electrical machine stator that can reduce the cost of parallel connection of winding coils.

  A rotating electrical machine stator according to the present disclosure is made of a magnetic material, and includes a stator core including an annular back yoke, a plurality of teeth protruding from the back yoke to the inner peripheral side, and a plurality of slots that are spaces between adjacent teeth. A phase coil formed by sequentially connecting a plurality of segment coils inserted over a predetermined slot of the stator core and wound around the teeth by a predetermined connection method and a plurality of phase coils of the same phase are electrically connected to each other. And a plurality of power line lead terminals respectively drawn out from the same phase phase coil, and connected to the metal plate further on the outer peripheral side than the outer peripheral edge of the back yoke of the stator core. A plurality of lead terminals joined together, and a phase power line secured to the metal plate by caulking.

  According to the rotating electric machine stator having the above configuration, the phase power line is fixed by the metal plate and the caulking, so that welding work or the like at that portion becomes unnecessary, and the cost for parallel connection of the winding coils can be suppressed.

It is a block diagram of the rotary electric machine stator which concerns on embodiment. It is detail drawing of the parallel connection part which is the A section of FIG. It is a figure which shows each element used for the parallel connection part of FIG. 2, and the power line for parallel connection which assembled each element. It is a figure which shows the phase power line of a prior art for the comparison. FIG. 5 is a diagram corresponding to FIG. 2 and showing a prior art parallel connection process using the phase power lines of FIG. 4.

  Embodiments according to the present disclosure will be described below in detail with reference to the drawings. In the following, a rotating electrical machine stator used for a rotating electrical machine mounted on a vehicle will be described. However, this is an illustrative example, and a rotating electrical machine in which parallel connection processing is performed with respect to a stator coil even if not mounted on a vehicle. It may be a rotating electrical machine stator used in the above. In the following, the stator coil is assumed to be wound with three-phase distributed winding, and for example, the U-phase winding is assumed to be connected to the U-phase power line by connecting two U-phase coils in parallel. As long as a plurality of phase coils are connected in parallel. For example, three or more phase coils may be connected in parallel and connected to one phase power line. Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted.

  FIG. 1 is a configuration diagram of a rotating electrical machine stator 10 used in a rotating electrical machine mounted on a vehicle. Hereinafter, unless otherwise specified, the rotating electrical machine stator 10 is referred to as a stator 10. The stator 10 is a stator of a rotating electric machine, and is an annular part including a stator core 12 and a stator coil 20 wound around the stator core 12. A rotor (not shown), which is a rotor of a rotating electrical machine, is disposed in a circular center hole of the stator 10 with a predetermined radial gap.

  FIG. 1 shows the central axis CL of the annular stator 10 and the axial direction, radial direction, and circumferential direction. The axial direction is a direction parallel to the central axis CL. The radial direction is a radial direction from the central axis CL, the central axis CL side is the inner peripheral side, and the direction away from the central axis CL is the outer peripheral side. The circumferential direction is a direction around the central axis CL.

  The stator core 12 is a magnetic part having a center hole in which a rotor (not shown) is disposed. The stator core 12 is formed between an annular back yoke 14, a plurality of teeth 16 protruding from the back yoke 14 to the inner peripheral side, and adjacent teeth 16. It includes a plurality of slots 18 that are spaces. In FIG. 1, since the stator coil 20 is disposed, the teeth 16 and the slots 18 are shown only on the inner peripheral wall surface of the center hole.

  The stator core 12 is a laminated body in which a predetermined number of magnetic thin plates including teeth 16 and slots 18 are stacked in the axial direction. As the magnetic thin plate, an electromagnetic steel plate which is a kind of silicon steel plate is used. Instead of a laminated body of magnetic thin plates, an integrated magnetic core may be used.

  The stator coil 20 is a three-phase distributed winding of U phase, V phase, and W phase. The windings of each phase are inserted across a predetermined slot 18 of the stator core 12 and wound around the teeth 16. A plurality of segment coils 22 are sequentially connected by a predetermined connection method. The segment coil 22 is a conductor wire with an insulation film that is formed in a substantially U shape by coating an insulation film around the conductor wire except for both ends. A copper wire, a copper tin alloy wire, a silver plating copper tin alloy wire, etc. are used as a strand of the conductor wire with an insulating film. As the insulating film, a polyamide-imide enamel film is used.

  When the segment coil 22 is wound around the stator core 12, a portion protruding from the axial end surface of the stator core 12 is called a coil end. The coil ends protrude from both end surfaces of the stator core 12 in the axial direction. FIG. 1 shows a coil end 24 on the lead side from which a lead terminal for a power line is drawn. The coil end on the opposite lead side is hidden in the outer peripheral surface of the stator core 12 and is not shown in FIG.

  Each of the U-phase winding, V-phase winding, and W-phase winding is composed of two phase coils. The two U-phase coils in the U-phase winding are distinguished and referred to as U1 coil and U2 coil. Similarly, the two V-phase coils in the V-phase winding are distinguished and referred to as V1 coil and V2 coil, and the two W-phase coils in the W-phase winding are distinguished and referred to as W1 coil and W2 coil. Since there are a total of six phase coils, the respective phase coils are arranged in the stator core 12 at intervals of 6 slots. In FIG. 1, U1, U2, V1, V2, W1, and W2 are assigned as the order of arrangement of the phase coils.

  Therefore, the U1 coil, the U2 coil, the V1 coil, the V2 coil, the W1 coil, and the W2 coil are wound around the teeth 16 of the stator core 12 in a predetermined arrangement. From the coil end 24 on the lead side of the stator coil 20, lead terminals for power lines are drawn out from the respective phase coils.

  Taking the U-phase winding as an example, the U-phase winding is formed by connecting a U1 coil and a U2 coil in parallel. Apart from this, the U-phase winding may be formed by connecting a U1 coil and a U2 coil in series. In contrast to the series connection method, the parallel connection method has a feature that the diameter of the conductor wire can be reduced to allow the same power to flow. In order to form a U-phase winding by connecting U1 coil and U2 coil in parallel, one end of U1 coil and one end of U2 coil are connected and used as a neutral point as a three-phase winding. The other end of the U1 coil is a lead terminal for the power line of the U1 coil, and the other end of the U2 coil is a lead terminal for the power line of the U1 coil. Further, the lead terminal for the power line of the U1 coil and the lead terminal for the power line of the U2 coil are connected in parallel and connected to the U-phase power line. The U-phase power line is connected to an external drive circuit that drives the rotating electrical machine together with the V-phase power line and the W-phase power line.

  That is, two processes are required to connect the lead terminal for the power line of the U1 coil and the lead terminal for the power line of the U2 coil to the U-phase power line by the parallel connection method. The first is a process of [connecting the lead terminal for the power line of the U1 coil and the lead terminal for the power line of the U2 coil]. The second is [processing the U-phase power that is connected in parallel. Connect to line] process. Both of these processes are collectively referred to as a parallel connection process. The same applies to the V phase and the W phase.

  In FIG. 1, A part is the parallel connection part 30 in which the parallel connection process about U1 coil and U2 coil was performed. Parallel connection unit 30 includes a metal plate 40, a U-phase power line 50, and a power line connection unit 60.

  FIG. 2 is a detailed view of part A of FIG. FIG. 3 is a diagram illustrating each element when the parallel connection portion 30 is disassembled. FIG. 3A is a diagram showing each of the metal plate 40, the U-phase power line 50, and the power line connection part 60. (B) shows that the lead terminal for the power line of the U1 coil and the lead terminal for the power line of the U2 coil are still in the assembled state with the metal plate 40, the U-phase power line 50, and the power line connecting portion 60. It is a figure which shows the power line 32 for parallel connection of the state which is not connected.

  The U1 lead terminal 26 shown in FIG. 2 is a lead terminal for a power line at the other end of the U1 coil drawn out from the coil end 24 on the lead side. The U2 lead terminal 28 is a lead terminal for a power line at the other end of the U2 coil drawn out from the coil end 24 on the lead side. In order to distinguish between the U1 lead terminal 26 and the U2 lead terminal 28, diagonal lines which are inclined in different directions are given.

  The U1 lead terminal 26 and the U2 lead terminal 28 are drawn from the coil end 24 further to the outer peripheral side than the outer peripheral edge portion of the back yoke 14 of the stator core 12, where the tip end portion is bent along the axial direction of the stator 10. The position of the bent tip portion is also further on the outer peripheral side than the outer peripheral edge portion of the back yoke 14 of the stator core 12.

  The metal plate 40 is a conductor plate for electrically connecting two U-phase coils of the same phase in parallel with each other. Furthermore, the metal plate 40 is also a conductor plate connected to the U-phase power line 50.

  The metal plate 40 has two protrusions 42 and 44 at the tip so that the U1 lead terminal 26 and the U2 lead terminal 28 can be separated and connected individually. The metal plate 40 has a caulking surrounding portion 46 at the base portion opposite to the protruding portions 42 and 44. The caulking surrounding portion 46 has an opening on one side and is a portion where a part of the metal plate 40 is bent. A U-phase power line 50 as a wire is inserted into the bending portion, and the bending portion is caulked. By crushing, the U-phase power line 50 and the metal plate 40 can be electrically and mechanically connected. The two protruding portions 42 and 44 and the caulking surrounding portion 46 of the metal plate 40 are preliminarily processed to expose the metal surface. For example, the film is removed and necessary cleaning is performed.

  U-phase power line 50 is a power line connected to an external drive circuit or the like. U-phase power line 50 includes a main body cable portion 52 and caulking insertion portions 54 and 56 at both ends of main body cable portion 52. The main body cable portion 52 is a power cable covered with an insulation coating having an insulation performance corresponding to high voltage and high power. The caulking insertion portions 54 and 56 are portions where the insulation coating of the main body cable portion 52 is removed and the bare conductor portion is exposed. The caulking insertion portion 54 has an outer diameter that can be inserted into the curved portion of the caulking surrounding portion 46 of the metal plate 40. The caulking insertion portion 56 has an outer diameter that can be inserted into the bending portion of the caulking surrounding portion 64 of the power line connecting portion 60 described below.

  The power line connecting portion 60 includes a main body plate portion 62, a caulking surrounding portion 64 provided at one end portion of the main body plate portion 62, and a connection ring portion 66 provided at the other end portion. The caulking surrounding portion 64 is a portion having an opening on one side and a curved end portion on one side of the main body plate portion 62, similarly to the caulking surrounding portion 46 of the metal plate 40. The U-phase power line 50 and the power line connecting portion 60 can be electrically and mechanically connected by inserting the U-phase power line 50, which is a wire, into the curved portion and crushing the curved portion with caulking. The connection ring portion 66 is electrically and mechanically connected to the drive circuit using a nut or the like when a U-phase connection terminal in an external drive circuit is inserted and the U-phase connection terminal has a male screw portion. Connected end. The caulking enclosure part 64 and the connection ring part 66 of the power line connection part 60 are preliminarily processed to expose the metal surface. For example, the film is removed and necessary cleaning is performed.

  The parallel connection power line 32 shown in FIG. 3B is assembled by assembling the metal plate 40, the U-phase power line 50, and the power line connecting part 60 by caulking processes at two caulking parts 70 and 72. Parts. Integration by the caulking process is performed as follows. The caulking insertion portion 54 of the U-phase power line 50 is inserted into the caulking enclosure portion 46 of the metal plate 40, and in this state, the caulking enclosure portion 46 is crushed with an appropriate caulking jig to form the caulking portion 70. Similarly, the caulking insertion portion 56 of the U-phase power line 50 is inserted into the caulking surrounding portion 64 of the power line connecting portion 60. In this state, the caulking surrounding portion 64 is crushed with an appropriate caulking jig, and the caulking portion 72 is moved. Form. In this way, the three components are integrated to form the parallel connection power line 32 having the protruding portion 42 for connecting the U1 lead terminal 26 and the protruding portion 44 for connecting the U2 lead terminal 28.

  Returning to FIG. 2, the U1 lead terminal 26 and the U2 lead terminal 28 are connected to the U-phase power line 50 by the parallel connection method as follows. The protrusion 42 of the parallel connection power line 32 is aligned with the tip of the U1 lead terminal 26. Similarly, the protrusion 44 of the parallel connection power line 32 is aligned with the tip of the U2 lead terminal 28. Then, using an appropriate welding facility, the protruding portion 42 of the parallel connection power line 32 and the tip of the U1 lead terminal 26 are welded at a welding point 74, and the protruding portion 44 of the parallel connection power line 32 and the U2 lead are connected. The distal end portion of the terminal 28 is welded at a welding point 76. Thus, the U1 lead terminal 26 and the U2 lead terminal 28 are electrically and mechanically connected to the parallel connection power line 32 in a state of being connected in parallel.

  According to the said structure, the power wire 32 for parallel connection which integrated the metal plate 40, the U-phase power line 50, and the power line connection part 60 by the crimping process can be prepared beforehand. Thereby, a parallel connection process can be performed by one part of the power line 32 for parallel connection and the welding process of two places of the welding locations 74 and 76. FIG.

  The positions of the tip portions of the U1 lead terminal 26 and the U2 lead terminal 28 are further on the outer peripheral side than the outer peripheral edge portion of the back yoke 14 of the stator core 12. Therefore, since the two welding points 74 and 76 are both further on the outer peripheral side than the outer peripheral edge portion of the back yoke 14 of the stator core 12, the welding process is facilitated as compared with the welding on the inner peripheral side of the stator core 12. It can be carried out.

  4 and 5 are diagrams showing parallel connection processing according to the prior art. Here, corresponding to FIG. 2 and FIG. 3, parallel connection processing is performed in which the U1 lead terminal 26 and the U2 lead terminal 28 are connected to the U-phase power line 80 used in the prior art by a parallel connection method. Show.

  FIG. 4 is a U-phase power line 80 used in the prior art. Compared with FIG. 3, the U-phase power line 80 according to the prior art does not use the metal plate 40, so that the main body cable portion 82 corresponding to the main body cable portion 52 of FIG. And a tip 84 from which the coating has been removed. The other end of the main body cable portion 82 is connected by the caulking process with the same power line connecting portion 60 as described in FIG.

  FIG. 5 corresponds to FIG. 2, and the U1 lead terminal 26 and the U2 lead terminal 28 are drawn from the coil end 24. Since the counterpart U-phase power line 80 to which these are connected in parallel has only one tip 84, a bus bar 86 as an intermediate member is used. Bus bar 86 has three protrusions, and is arranged at a position facing the tip of U1 lead terminal 26, the tip of U2 lead terminal 28, and tip 84 of U-phase power line 80, respectively. In the prior art, each of the three front end portions of the bus bar 86, the front end portion of the U1 lead terminal 26, the front end portion of the U2 lead terminal 28, and the front end portion 84 of the U-phase power line 80 are faced to each other. , 92, 94. And these three places are welded sequentially using a suitable welding equipment. Thus, the U1 lead terminal 26 and the U2 lead terminal 28 are electrically and mechanically connected to the U-phase power line 80 in a state of being connected in parallel. According to the prior art, the parallel connection processing can be performed by the welding processing of the U-phase power line 80 and the bus bar 86 and the welding processing of three locations of the welding locations 90, 92, and 94.

  On the other hand, according to the configuration described in FIG. 2, the parallel connection process can be performed by one part of the parallel connection power line 32 and the two welding processes of the welding points 74 and 76. Therefore, according to the configuration of FIG. 2, the number of parts can be reduced and the number of welds can be reduced as compared with the prior art. Thereby, the cost required for parallel connection processing can be suppressed.

  10 (rotary electric machine) stator, 12 stator core, 14 back yoke, 16 teeth, 18 slots, 20 stator coil, 22 segment coil, 24 coil end, 26 U1 lead terminal, 28 U2 lead terminal, 30 parallel connection part (A part) , 32 Parallel connection power line, 40 Metal plate, 42, 44 Protruding part, 46, 64 Caulking enclosure part, 50 U-phase power line, 52 Main body cable part, 54, 56 Caulking insertion part, 60 Power line connection part, 62 Main body plate part, 66 connection ring part, 70, 72 crimping part, 74, 76, 90, 92, 94 welded part, 80 (prior art) U-phase power line, 82 main body cable part, 84 tip part, 86 busbar.

Claims (1)

A stator core comprising a magnetic body, including an annular back yoke, a plurality of teeth protruding from the back yoke to the inner peripheral side, and a plurality of slots which are spaces between the adjacent teeth;
A phase coil formed by sequentially connecting a plurality of segment coils inserted over the predetermined slot of the stator core and wound around the teeth by a predetermined connection method;
A metal plate for electrically connecting a plurality of the phase coils of the same phase to each other in parallel;
A plurality of lead terminals for power lines respectively drawn from the phase coils of the same phase, wherein the plurality of leads are joined to the metal plate further on the outer peripheral side than the outer peripheral edge of the back yoke of the stator core. A terminal,
A phase power line fixed to the metal plate by caulking;
A rotating electrical machine stator.

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