JP-2026075271-A - A stator unit, an electric motor equipped with the stator unit, and an air conditioning system, refrigerator, and vehicle-mounted device on which the electric motor is installed.

JP2026075271AJP 2026075271 AJP2026075271 AJP 2026075271AJP-2026075271-A

Abstract

[Problem] To provide a stator unit, etc., that can ensure the cooling efficiency of the coil. [Solution] At least one refrigerant passage between multiple coils U1 to W3 is blocked by the cluster block 70. However, at least a portion of the tube 59 covering the neutral point 58 is placed between the bottom surface of the cluster block 70 and the coils V1 and W2, so that the tube 59 does not further block the refrigerant passage. As a result, the cooling medium can be easily passed through many refrigerant passages, so that the cooling efficiency of coils U1 to W3 can be ensured. [Selection Diagram] Figure 2

Inventors

永井信幸
奥山智広
松井健真
黒古雅司
真野鐘治

Assignees

愛知電機株式会社

Dates

Publication Date: 20260508
Application Date: 20241022

Claims (9)

A stator unit comprising a cylindrical stator provided on an electric motor, and an insulating cluster block in contact with the axial end face of the stator, The stator is, A stator core with multiple teeth protruding radially inward from the yoke, An insulating bobbin is positioned at the axial end face of the stator core, Each of the aforementioned teeth and the conductor wound in a concentrated winding manner around the bobbin are formed, and a plurality of three-phase coils are arranged in the circumferential direction of the stator, A plurality of refrigerant passages are formed between the coils in the circumferential direction and communicate with both sides of the stator in the axial direction, A plurality of terminal-side lead wires are drawn out from each of the coils, continuously connected to one end of the conductor forming the coil, Multiple neutral point lead wires are drawn from each of the coils, continuously connected to the other end of the conductor forming the coil, and are connected to each other to form a neutral point. The system comprises a cylindrical, closed-end insulating tube that covers the neutral point, The cluster block is an insulating box that houses three-phase connection terminals provided at the ends of a plurality of terminal-side lead wires, and the bottom surface of the cluster block contacts the axial end face of the bobbin opposite to the stator core so as to cover at least one of the refrigerant passages in the axial view, A stator unit characterized in that at least a portion of the tube is arranged to overlap in the axial view between the bottom surface of the cluster block and the coil.
Of the aforementioned circumferential directions, the direction in which the terminal-side lead wires exit from the cluster block is designated as the first direction, and the direction opposite to the first direction is designated as the second direction. The stator unit according to claim 1, characterized in that the closed tip of the tube faces the second direction and is located on the first direction side of the end of the cluster block in the second direction.
The bobbin mentioned above is An outer peripheral wall portion is provided along the radially outer side of the coil and protrudes from the coil toward the side opposite to the stator core, The coil comprises an inner circumferential wall portion provided along the radially inner side of the coil and projecting toward the side opposite to the stator core relative to the coil, The stator unit according to claim 1, characterized in that the plurality of terminal-side lead wires, the plurality of neutral-side lead wires, and the tube are fixed to either the outer peripheral wall portion or the inner peripheral wall portion by winding a thread around them.
Of the aforementioned circumferential directions, the direction in which the tip of the tube points is defined as the second direction. Multiple neutral point-side lead wires extend from each of the coils in a second direction and gradually merge. The stator unit according to claim 3, characterized in that, in the axial view, the tip side of the tube and the cluster block overlap with the coil over which only one of the neutral point side lead wires overlaps.
The aforementioned cluster block is A bottom plate having the aforementioned bottom surface, The bottom plate has a first through hole that penetrates it in the axial direction, It comprises a wall portion having a restricting surface facing the first through-hole side and extending from the bottom surface toward the stator core side, The bobbin has a protruding portion that extends from the axial end face of the bobbin and is inserted into the first through hole, An overhang extending from the tip of the aforementioned protrusion in the same direction as the direction toward the regulating surface, It comprises a contact surface that contacts the aforementioned restricting surface, The stator unit according to claim 1, characterized in that, with the contact surface in contact with the regulating surface, a part of the bottom plate around the first through hole and the protruding portion face each other in the axial direction.
An electric motor comprising a stator unit according to any one of claims 1 to 5.
An air conditioning system equipped with the electric motor described in claim 6.
A refrigerator equipped with the electric motor described in claim 6.
An in-vehicle device equipped with the electric motor described in claim 6.

Description

This invention relates to a stator unit capable of ensuring the cooling efficiency of a coil, an electric motor equipped with the stator unit, and an air conditioning system, refrigerator, and in-vehicle device on which the electric motor is mounted. Electric compressors, used in air conditioners, refrigerators, and automotive equipment, primarily comprise a compression unit for compressing fluid, a three-phase AC electric motor for driving the compression unit, and a control circuit for controlling the electric motor's operation (Patent Documents 1 and 2). The stator of the three-phase AC electric motor comprises a cylindrical stator core, an insulating cylindrical bobbin positioned at the axial end face of the stator core, and a plurality of three-phase coils wound around the stator core and bobbin in a concentrated winding manner, arranged circumferentially. Multiple terminal-side lead wires extend from each coil, and multiple connection terminals provided at the ends of these lead wires are connected to the control circuit. These connection terminals are housed in an insulating cluster block. Furthermore, multiple refrigerant passages communicating with both sides of the stator in the axial direction are provided between the circumferentially arranged coils, and the coils are cooled by the passage of a cooling medium through these refrigerant passages. In Patent Document 1, in order to house the electric motor in the limited space within the housing of the electric compressor, a cluster block is brought into contact with the axial end face of the bobbin opposite to the stator core. Furthermore, in an axial view, the cluster block is positioned to cover a portion of the space between multiple coils, so a portion of the refrigerant passage between the coils is blocked by the cluster block. In Patent Document 2, a neutral point is formed by connecting multiple neutral point lead wires drawn from the coil, and the neutral point is covered with a cylindrical, insulated tube with a closed end. This tube is fixed to the stator by being inserted between the coils, but this simultaneously blocks a portion of the refrigerant passage between the coils. However, in Patent Document 2, because the space within the electric compressor housing is wide, the cluster block is axially separated from the bobbin, and the refrigerant passage is not blocked by the cluster block. International Publication No. 2023/189893Japanese Patent Publication No. 2018-157711 (a) is a schematic block diagram showing a vehicle equipped with an electric motor in the first embodiment, and (b) is a schematic cross-sectional view showing an electric compressor.This is a one-sided cross-sectional view of the stator unit along line II-II in Figure 1(b).This is a schematic top view of the stator unit showing the terminal side lead wires.This is a top view of the stator unit, schematically showing the lead wire on the neutral point side.(a) is a cross-sectional view of the tube and neutral point lead wire in the Va-Va line of Figure 4, and (b) is a side view of the tube and neutral point lead wire as seen from the direction of arrow Vb in Figure 5(a).(a) is a schematic top view of the stator unit showing the threads for fixing the terminal-side lead wires and the neutral point-side lead wires, and (b) is a cross-sectional view of the stator unit along the VIb-VIb line in Figure 6(a).(a) is a cross-sectional view of the stator unit along the line VIIa-VIIa in Figure 2, and (b) is a cross-sectional view of the stator unit along the line VIIb-VIIb in Figure 2.(a) is a top view of a stator unit having a cluster block in the second embodiment, and (b) is a perspective view of the cluster block.(a) is a schematic block diagram showing an air conditioning unit equipped with an electric motor, and (b) is a schematic block diagram showing a refrigerator equipped with an electric motor. The following describes preferred embodiments with reference to the attached drawings. Figure 1(a) is a schematic block diagram showing a vehicle 1 equipped with an air conditioning system 10 that includes an electric compressor 11, including an electric motor 30, according to the first embodiment. Figure 1(b) is a schematic cross-sectional view showing the electric compressor 11. In Figure 1(b), hatching of some parts of the electric compressor 11 (such as the rotor 31 and stator 40) has been omitted to simplify the drawing. As shown in Figures 1(a) and 1(b), the vehicle's air conditioning system 10 (on-board system) is a device for supplying cool air generated by an electric compressor 11 to the interior space of the vehicle. The electric compressor 11 mainly comprises a compression unit 20, an electric motor 30, and an accumulator 12. The compression unit 20 and the electric motor 30 are arranged inside a sealed container 13. The sealed container 13 is provided with an intake pipe 15 and a discharge pipe 16 that connect the inside and outside of the sealed container 13. The