Rotating electric machine

Abstract

This rotating electric machine (1000) has a stator (100) in which a plurality of phase stator windings (102) are mounted on a stator core (101). The stator core (101) has a plurality of slots arranged in the circumferential direction. The slots are provided with conductor wires arranged in a plurality of rows in the radial direction. One end of the stator winding (102) is connected to a power supply unit (103), and the other end is connected to a neutral point (104). The power supply unit (103) and the neutral point (104) are located on a semicircle side of the stator (100) in a plane perpendicular to the central axis of the stator (100).

Description

Rotating electrical machine

[0001] The present disclosure relates to a rotating electrical machine.

[0002] In the windings of a rotating electrical machine, means for appropriately designing input and output portions at the ends of each phase winding and connecting both ends by welding or the like are used.

[0003] For example, it is disposed between the coil end portion in the radial direction of the stator core and the outer peripheral surface of the stator core, and between the axial end surface of the stator core in the axial direction of the stator core and the end portion of the lead wire portion, and is connected to three or more lead wire portions in a state adjacent to the stator core in the circumferential direction. A stator provided with a connecting member is disclosed.

[0004] Japanese Patent No. 6465203

[0005] However, when the stator of the rotating electrical machine of Patent Document 1 is adopted in an electric vehicle, since the ends of each winding are arranged over the entire circumference, it is necessary to use means such as welding to connect these ends. In addition, since the welding locations extend vertically, there is a problem that the welding work becomes complicated and the cost increases.

[0006] The present disclosure discloses a technique for solving the above problems, and aims to obtain a rotating electrical machine capable of reducing the number of welding points, concentrating the welding points on one side, and miniaturizing and reducing the cost of the stator.

[0007] The rotating electrical machine of the present disclosure is a rotating electrical machine having a stator in which a plurality of phases of stator windings are mounted on a stator core. The stator core has a plurality of slots arranged in the circumferential direction, and the slots are provided with conductor wires arranged in a plurality of rows in the radial direction. One end of the stator winding is connected to a power supply portion, and the other end is connected to a neutral point. The power supply portion and the neutral point are located on the semi-circular side in a plane orthogonal to the central axis of the stator.

[0008] According to the rotating electrical machine of the present disclosure, a rotating electrical machine capable of reducing the number of welding points, concentrating the welding points on one side, and miniaturizing and reducing the cost of the stator can be obtained.

[0009] This is a diagram illustrating the configuration of the stator in a rotating electric machine according to Embodiment 1. This is an explanatory diagram illustrating the basic arrangement of the stator windings in a rotating electric machine according to Embodiment 1. This is an explanatory diagram illustrating the arrangement of the stator windings in a rotating electric machine according to Embodiment 1. This is an explanatory diagram illustrating the arrangement of the stator windings in a rotating electric machine according to Embodiment 2.

[0010] Hereinafter, preferred embodiments of the rotating electric machine relating to this disclosure will be described with reference to the drawings. In each drawing, the same or corresponding parts will be denoted by the same reference numerals. In the illustrations between the drawings, the size and scale of the corresponding components are independent of each other, and the number of slots, the number of pole pairs, the number of turns of the coil, the number of coils housed in the slots, etc., can be arbitrarily changed. Furthermore, within the scope of this disclosure, it is possible to freely combine each embodiment, or to modify or omit each embodiment as appropriate.

[0011] Embodiment 1. Embodiment 1 relates to a rotating electric machine having a stator configured by mounting stator windings on a stator core, wherein the stator core has a plurality of slots arranged in the circumferential direction, where n is an even number of 4 or more, and the slots are equipped with conductor wires numbered 1 to n arranged in multiple rows in the radial direction, and in each phase of the rotating electric machine, a conductor wire structure is formed by connecting a plurality of conductor wires in series or in parallel, and the stator has a plurality of groups of multiple conductor wires of the same phase housed in adjacent slots, where q is the number of slots per pole per phase (q is a natural number of 2 or more), and the plurality of groups of the same phase are arranged evenly apart in the circumferential direction with a slot pitch of the number of phases of the rotating electric machine × q, and different groups of the same phase are connected using a plurality of jumpers that connect the conductor wire number 1 of one group to the conductor wire number n of the other group, and the connection part is located on the semicircular side in a plane perpendicular to the central axis of the stator.

[0012] The following description of the rotating electric machine according to Embodiment 1 is based on Figure 1, which is a diagram of the stator configuration in the rotating electric machine; Figure 2, which is a diagram explaining the basic arrangement of the stator windings in the rotating electric machine; and Figure 3, which is a diagram explaining the arrangement of the stator windings in the rotating electric machine.

[0013] First, the configuration of the stator 100 of the rotating electric machine 1000 of Embodiment 1 will be described with reference to Figure 1. The stator 100 comprises a stator core 101 and stator windings 102. The stator 100 also comprises a power supply section 103, a neutral point busbar 104B, and coil ends 121.

[0014] Furthermore, in the following explanation, the rotation axis of the rotor (not shown) is defined as the central axis of the stator 100, and when the terms axis (direction), radius (direction), and circumference (direction) are used, unless otherwise specified, they refer to the central axis (direction), radius (direction), and circumference (direction) of the central axis in a cylindrical coordinate system centered on the central axis of the stator 100. Specifically, the direction of the central axis of the stator 100 is described as the axial direction (XD), and the upper side of Figure 1 is considered the positive direction. On a plane perpendicular to the central axis of the stator 100, the direction from the central axis toward the outer circumferential surface of the stator 100 is described as the radial direction (RD). Also, a view of the stator 100 from the coil end 121 in the axial direction (XD) is appropriately described as a top view.

[0015] Next, the basic arrangement of the stator windings 102 of the stator 100 will be explained based on Figure 2. Figure 2 shows the arrangement of conductor wires for one phase in a three-phase AC rotating electric machine, where the number of slots per pole per phase is q (where q is a natural number of 2 or more), and multiple conductor wires numbered 1 to n (where n is a natural number of 2 or more) are housed in a single radial row within one slot of circumferentially arranged slots. The circumferential distance between adjacent slots is defined as the unit slot pitch, and k times the unit slot pitch (where k is a natural number of 1 or more) is defined as the k slot pitch. A group of wires numbered 1 to n (a group of q × n conductor wires) from adjacent q slots (U1 to Uq) of the same phase is referred to as a group (GR). In Figure 2, the radial direction is denoted as RD, the circumferential direction as PD, the inner diameter side as IS, and the outer diameter side as OS. Furthermore, slot numbers are denoted as SN, track 1 as 1L, track 2 as 2L, track 3 as 3L, ..., track n as nL, and group as GR. In addition, unit slot pitch is denoted as USP, and k slot pitch as kSP.

[0016] Next, as a specific example of the winding arrangement of the stator 100, the case where the windings are arranged in parallel with q=4 and 8 in Figure 2 will be explained based on Figure 3. Figure 3 is a top view of Figure 1, and each phase power supply section and neutral point are described as U-phase power supply section 103U, V-phase power supply section 103V, W-phase power supply section 103W, U-phase neutral point 104U, V-phase neutral point 104V, and W-phase neutral point 104W. The metal strip connecting each neutral point (U-phase neutral point 104U, V-phase neutral point 104V, W-phase neutral point 104W) is described as the neutral point busbar 104B. The neutral point busbar 104B has a protrusion, and this protrusion connects it to each neutral point. When referring to the power supply section and neutral point without distinguishing between phases, they are described as power supply section 103 and neutral point 104.

[0017] The stator windings 102 are connected to the power supply section 103 and the neutral point 104, or the stator windings are connected to each other, with the connection points located on the semicircular side of the stator core 101. This makes welding of the connection points easier, and enables the rotating electric machine 1000 to be manufactured at a low cost.

[0018] Here, the features of the stator 100 of the rotating electric machine 1000 of Embodiment 1 are summarized. In the rotating electric machine 1000 having a stator 100 configured by mounting a plurality of phase stator windings 102 on a stator core 101, the stator core 101 has a plurality of slots arranged in the circumferential direction, and the slots are equipped with conductor wires arranged in a plurality of rows in the radial direction, and one end of the stator winding 102 is connected to the power supply section 103 and the other end is connected to the neutral point 104, and the power supply section 103 and the neutral point 104 are located on the semicircular side in a plane perpendicular to the central axis of the stator 100.

[0019] Furthermore, the ends of the stator windings 102 connected to the power supply section 103 and the neutral point 104 are oriented radially (RD) to the stator core 101. In addition, the ends of the stator windings 102 connected to the power supply section 103 and the neutral point 104 are at the same height in the axial direction of the stator core 101. By extending the ends of the stator windings 102 radially and aligning their heights, the stator 100 can be miniaturized.

[0020] As described above, the rotating electric machine of Embodiment 1 reduces the number of welding points, concentrates the welding points on one side, and enables a rotating electric machine that is smaller and less expensive than the stator.

[0021] Embodiment 2. In Embodiment 2, when there are multiple stator windings, the stator windings are arranged vertically above and below the stator core in the axial direction.

[0022] The second embodiment of the rotating electric machine will be described based on Figure 4, which is an explanatory diagram of the arrangement of the stator windings in the rotating electric machine. In the drawings of the second embodiment, parts that are the same as or corresponding to those in the first embodiment are denoted by the same reference numerals.

[0023] In Figure 4, the eight parallel windings described in Embodiment 1 are arranged in each power supply section 103, with the ends of two stator windings 102 positioned vertically in the axial direction. In this way, when there are multiple stator windings 102, arranging them vertically in the axial direction of the stator core 101 makes it possible to share welding equipment with the case where there is a single stator winding, enabling the inexpensive manufacture of rotating electric machines.

[0024] As described above, the rotating electric machine of Embodiment 2 reduces the number of welding points, concentrates the welding points on one side, and enables a rotating electric machine that is smaller and less expensive to manufacture. Furthermore, if there are multiple stator windings, arranging them vertically in the axial direction makes it possible to manufacture the rotating electric machine at a low cost.

[0025] While this disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to the application of a particular embodiment, but are applicable individually or in various combinations to the embodiments. Accordingly, countless variations not illustrated are envisioned within the scope of the art disclosed in this specification. For example, these include modifying, adding or omitting at least one component, or extracting at least one component and combining it with a component from another embodiment.

[0026] 100 Stator, 101 Stator core, 102 Stator winding, 103 Power supply section, 103U U-phase power supply section, 103V V-phase power supply section, 103W W-phase power supply section, 104 Neutral point, 104U U-phase neutral point, 104V V-phase neutral point, 104W W-phase neutral point, 104B Neutral point busbar, 121 Coil end, 1000 Rotating electric machine.

Claims

1. A rotating electric machine having a stator configured by mounting stator windings of multiple phases on a stator core, wherein the stator core has a plurality of slots arranged in the circumferential direction, and the slots are equipped with conductor wires arranged in a plurality of rows in the radial direction, and one end of the stator winding is connected to a power supply section and the other end is connected to a neutral point, and the power supply section and the neutral point are located on the semicircular side in a plane perpendicular to the central axis of the stator.

2. The rotating electric machine according to claim 1, wherein the ends of the stator windings connected to the power supply unit and the neutral point are oriented radially toward the stator core.

3. The rotating electric machine according to claim 2, wherein the ends of the stator windings connected to the power supply unit and the neutral point are at the same height in the axial direction of the stator core.

4. The rotating electric machine according to claim 2 or 3, wherein, in the case where there are multiple stator windings connected to the power supply unit and the neutral point, the stator windings are arranged vertically in the axial direction of the stator core.

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