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EP-4007127-B1 - ELECTRIC MOTOR, COMPRESSOR, REFRIGERATION CIRCUIT DEVICE, AND MANUFACTURING METHOD FOR ELECTRIC MOTOR

EP4007127B1EP 4007127 B1EP4007127 B1EP 4007127B1EP-4007127-B1

Inventors

  • Taema, Yoshihiro
  • SUGIMOTO, Yasuharu
  • SHIBATA, KAZUO

Dates

Publication Date
20260506
Application Date
20190731

Claims (10)

  1. An electric motor (13) comprising: a cylindrical stator (40) and a rotor (30) disposed inside the stator (40), wherein the stator (40) comprises an iron core (50) including a cylindrical yoke (51) and nine teeth (52) protruding inwardly of the yoke (51), an insulating member (60) provided at an end portion of the iron core (50) in an axial direction, three independent windings (9U, 9V, 9W) respectively wound continuously on three different teeth of the nine teeth (52), three first crimp terminals (80U1, 80V1, 80W1) provided respectively to the three windings (9U, 9V, 9W), and three second crimp terminals (80U2, 80V2, 80W2) provided respectively to the three windings (9U, 9V, 9W), each of the three windings (9U, 9V, 9W) includes a first terminal wire (9a), a second terminal wire (9b), a first intermediate wire (9c) between two teeth of the nine teeth (52) close to the second terminal wire (9b), and a second intermediate wire (9d) between two teeth of the nine teeth (52) close to the first terminal wire (9a), wherein each of the three windings (9U, 9V, 9W) is wound in the order of a first tooth (52U1, 52V1, 52W1), a second tooth (52U2, 52V2, 52W2) and a third tooth (52U3, 52V3, 52W3), the first terminal wire (9a) corresponds to a portion between a terminal (T1) and the first tooth (52U1, 52V1, 52W1) at a beginning of winding, the second terminal wire (9b) corresponds to a portion between a terminal (T2) and the third tooth (52U3, 52V3, 52W3) at an end of winding, the first intermediate wire (9c) corresponds to a portion that connects the second tooth (52U2, 52V2, 52W2) and the third tooth (52U3, 52V3, 52W3), the second intermediate wire (9d) corresponds to a portion that connects the first tooth (52U1, 52V1, 52W1) and the second tooth (52U2, 52V2, 52W2), the first crimp terminals (80U1, 80V1, 80W1) connect the first terminal wire (9a) of the corresponding winding to two points of the first intermediate wire (9c) of the winding, and the second crimp terminals (80U1, 80V1, 80W1) connect the second terminal wire (9b) of the corresponding winding to two points of the second intermediate wire (9d) of the winding.
  2. The electric motor (13) of claim 1, wherein the insulating member (60) includes three first housing sections (62U1, 62V1, 62W1) provided for each of the three windings (9U, 9V, 9W) and three second housing sections (62U2, 62V2, 62W2) provided for each of the three windings (9U, 9V, 9W), each of the first housing sections (62U1, 62V1, 62W1) accommodates the first terminal wire (9a) of the corresponding winding and the two points of the first intermediate wire (9c) of the winding, each of the second housing sections (62U2, 62V2, 62W2) accommodates the second terminal wire (9b) of the corresponding winding and the two points of the second intermediate wire (9d) of the winding, each of the first crimp terminals (80U1, 80V1, 80W1) connects the first terminal wire (9a) and the two points of the first intermediate wire (9c) accommodated in the first housing section (62U1, 62V1, 62W1), and each of the second crimp terminals (80U2, 80V2, 80W2) connects the second terminal wire (9b) and the two points of the second intermediate wire (9d) accommodated in the second housing section (62U2, 62V2, 62W2).
  3. The electric motor (13) of claim 2, wherein each of the first housing sections (62U1, 62V1, 62W1) are provided on an outer side of a radial direction around a rotation axis (AX) of the rotor (30) with respect to the teeth (52) on which a portion between the second terminal wire (b) and the first intermediate wire (9c) of the corresponding winding is wound, and the second housing sections (62U2, 62V2, 62W2) are provided on an outer side of the radial direction with respect to the teeth (52) on which a portion between the first intermediate wire (9c) and the second intermediate wire (9d) of the corresponding winding is wound.
  4. The electric motor (13) of claim 1 further comprising: three first lead wires (90U1, 90V1, 90W1) respectively connected to the three first crimp terminals (80U1, 80V1, 80W1), and three second lead wires (90U2, 90V2, 90W2) respectively connected to the three second crimp terminals (80U2, 80V2, 80W2), wherein the electric motor (13) has an open winding type circuit configuration in which three circuits respectively including the three windings (9U, 9V, 9W) are independent of each other.
  5. The electric motor (13) of claim 1 further comprising: three first lead wires (90U1, 90V1, 90W1) connected to the three first crimp terminals (80U1, 80V1, 80W1) and three second lead wires (90U2, 90V2, 90W2) respectively connected to the three second crimp terminals (80U2, 80V2, 80W2), wherein the three second lead wires (90U2, 90V2, 90W2) are connected to each other at a neutral point.
  6. A compressor (2) comprising the electric motor (13) of claim 1, and a compression mechanism section (12) driven by the electric motor (13).
  7. The compressor (2) of claim 6 further comprising: a case (10) accommodating the electric motor (13) and the compression mechanism section (12) and having an opening on the insulating member (60) side, a cover (11) sealing the opening, three first lead wires (90U1, 90V1, 90W1) connected to the three first crimp terminals (80U1, 80V1, 80W1), and three second lead wires (90U2, 90V2, 90W2) respectively connected to the three second crimp terminals (80U2, 80V2, 80W2), wherein the cover (11) includes a first terminal (11a) to which the three first lead wires (90U1, 90V1, 90W1) are connected and a second terminal (11b) to which the three second lead wires (90U2, 90V2, 90W2) are connected, the three first lead wires (90U1, 90V1, 90W1) are bundled together and include a first bending point (P1) that rises toward the cover, the three second lead wires (90U2, 90V2, 90W2) are bundled together and include a second bending point (P2) that rises toward the cover (11), and when the electric motor (13) is viewed in an axial direction parallel to a rotation axis (AX), one of two regions separated by a straight line (D) passing through the rotation axis (AX) includes the first and second bending points (P1, P2), and the other region includes the first and second terminals (11a, 11b).
  8. A refrigeration cycle device (1) comprising the compressor (2) of claim 6, a heat sink (6) connected to the compressor (2), an expansion device (8) connected to the heat sink (6), and a heat absorber (7) connected between the expansion device (8) and the compressor (2).
  9. A manufacturing method of an electric motor (13), the electric motor (13) comprising: a cylindrical stator (40) and a rotor (30) disposed inside the stator (40), wherein the stator (40) comprises an iron core (50) including a cylindrical yoke (51) and nine teeth (52) protruding inwardly of the yoke (51), an insulating member (60) provided at an end portion of the iron core (50) in an axial direction, three independent windings (9U, 9V, 9W) respectively wound continuously on three different teeth of the nine teeth (52), three first crimp terminals (80U1, 80V1, 80W1) provided respectively to the three windings (9U, 9V, 9W), and three second crimp terminals (80U2, 80V2, 80W2) provided respectively to the three windings (9U, 9V, 9W), with following steps winding the three windings (9U, 9V, 9W) respectively onto the different three teeth of the nine teeth (52) in order, each of the different three teeth including a first tooth (52U1, 52V1, 52W1), a second tooth (52U2, 52V2, 52W2) and a third tooth (52U3, 52V3, 52W3) ; connecting, in each of the three windings (9U, 9V, 9W), a first terminal wire (9a) to two points of a first intermediate wire (9c) by a first crimp terminal (80U1, 80V1, 80W1), the first terminal wire (9a) corresponds to a portion between a terminal (T1) and the first tooth (52U1, 52V1, 52W1) at a beginning of winding, the first intermediate wire (9c) corresponds to a portion that connects the second tooth (52U2, 52V2, 52W2) and the third tooth (52U3, 52V3, 52W3); and connecting, in each of the three windings (9U, 9V, 9W), a second terminal wire (9b) to two points of a second intermediate wire (9d) by a second crimp terminal (80U2, 80V2, 80W2), the second terminal wire (9b) corresponds to a portion between a terminal (T2) and the third tooth (52U3, 52V3, 52W3) at an end of winding, the second intermediate wire corresponds to a portion that connects the first tooth (52U1, 52V1, 52W1) and the second tooth (52U2, 52V2, 52W2).
  10. The manufacturing method of claim 9, wherein when winding the winding (9U, 9V, 9W) onto the three teeth, after winding the winding (9U, 9V, 9W) onto the first tooth (52U1, 52V1, 52W1), before winding the winding (9U, 9V, 9W) onto the second tooth (52U2, 52V2, 52W2), the winding (9U, 9V, 9W) is bent to form a first folded portion (9x), and after winding the winding (9U, 9V, 9W) onto the second tooth (52U2, 52V2, 52W2), before winding the winding (9U, 9V, 9W) onto a third tooth (52U3, 52V3, 52W3), the winding (9U, 9V, 9W) is bent to form a second folded portion (9y), and the winding (9U, 9V, 9W) is subsequently wound onto the third tooth (52U3, 52V3, 52W3), the first terminal wire (9a) and two points of the second folded portion (9y) are connected by the first crimp terminal (80U1, 80V1, 80W1), and the second terminal wire (9b) and two points of the first folded portion (9x) are connected by the second crimp terminal (80U2, 80V2, 80W2).

Description

Technical Field Embodiments described herein relate generally to an electric motor, a compressor, a refrigeration cycle device, and a method of manufacturing an electric motor. Background Art In the past, electric motors with various structures in which windings are wound on the teeth of an iron core of a stator have been known. For example, in an electric motor driven by a three-phase AC power supply, many winding connections are required, which increases the time and cost of manufacturing. Citation List Patent Literatures Patent Literature 1: JP 2015-70652 APatent Literature 2: JP 2019-62726 AEP 3 611 000 A2 discloses an electric motor comprising: a cylindrical stator and a rotor disposed inside the stator, whereinthe stator comprises an iron core including a cylindrical yoke and nine teeth protruding inwardly of the yoke, an insulating member provided at an end portion of the iron core in an axial direction, three independent windings respectively wound continuously on three different teeth of the nine teeth, three first crimp terminals provided respectively to the three windings, and three second crimp terminals provided respectively to the three windings,each of the three windings includes a first terminal wire, a second terminal wire, a first intermediate wire between two teeth of the nine teeth close to the second terminal wire, and a second intermediate wire between two teeth of the nine teeth close to the first terminal wire.JP 4 271003 B2 discloses a stator of a motor has a beginning winding terminal of a winding wire attached to one wire constraining groove of a first cavity, one or two lead-side crossing wires or one lead-side crossing wire and a lead wire attached to another wire constraining groove of the first cavity, and the winding wire. The winding terminals are inserted into the first and second cavities to connect the winding terminals with one or two lead-side crossing wires or one lead-side crossing wire and the lead wire, and to connect the winding terminals with the winding terminals at the end of the winding and one or two lead-side crossing wires or one lead-side crossing wire and the lead wire. The connection is made between the winding end terminal and one or two neutral-side crossing wires. Summary of Invention Technical Problem Embodiments described herein aim to provide an electric motor, a compressor, a refrigeration cycle device, and a manufacturing method for an electric motor, which can improve the efficiency of the winding connection process. Solution to Problem An electric motor according to an embodiment comprises a cylindrical stator and a rotor disposed inside the stator. The stator comprises an iron core including a cylindrical yoke and nine teeth protruding inwardly of the yoke, an insulating member provided at an end portion of the iron core in an axial direction, three independent windings respectively wound continuously on three different teeth of the nine teeth, three first crimp terminals provided respectively to the three windings, and three second crimp terminals provided respectively to the three windings. Each of the three windings includes a first terminal wire, a second terminal wire, a first intermediate wire between two teeth of the nine teeth close to the second terminal wire, and a second intermediate wire between two teeth of the nine teeth close to the first terminal wire. Each of the three windings is wound in the order of a first tooth, a second tooth and a third tooth. The first terminal wire corresponds to a portion between a terminal and the first tooth at a beginning of winding. The second terminal wire corresponds to a portion between a terminal and the third tooth at an end of winding. The first intermediate wire corresponds to a portion that connects the second tooth and the third tooth. The second intermediate wire corresponds to a portion that connects the first tooth and the second tooth. The first crimp terminals connect the first terminal wire of the corresponding winding to two points of the first intermediate wire of the winding. The second crimp terminals connect the second terminal wire of the corresponding winding to two points of the second intermediate wire of the winding. A compressor according to an embodiment comprises the electric motor, and a compression mechanism section driven by the electric motor. A refrigeration cycle device according to an embodiment comprises the compressor, a heat sink connected to the compressor, an expansion device connected to the heat sink, and a heat absorber connected between the expansion device and the compressor. A manufacturing method of an electric motor according to an embodiment comprises winding the three windings respectively onto the different three teeth of the nine teeth in order, each of the different three teeth including a first tooth, a second tooth and a third tooth; connecting, in each of the three windings, a first terminal wire to two points of a first intermediate wire by