WO2024089866A1 - 固定子、電動機、圧縮機および冷凍サイクル装置 - Google Patents

固定子、電動機、圧縮機および冷凍サイクル装置 Download PDF

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Publication number
WO2024089866A1
WO2024089866A1 PCT/JP2022/040310 JP2022040310W WO2024089866A1 WO 2024089866 A1 WO2024089866 A1 WO 2024089866A1 JP 2022040310 W JP2022040310 W JP 2022040310W WO 2024089866 A1 WO2024089866 A1 WO 2024089866A1
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WIPO (PCT)
Prior art keywords
winding
teeth
wound around
stator
inner winding
Prior art date
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Ceased
Application number
PCT/JP2022/040310
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English (en)
French (fr)
Japanese (ja)
Inventor
浩二 矢部
勇二 廣澤
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Filing date
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Priority to PCT/JP2022/040310 priority Critical patent/WO2024089866A1/ja
Priority to JP2024552631A priority patent/JPWO2024089866A1/ja
Publication of WO2024089866A1 publication Critical patent/WO2024089866A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/18—Windings for salient poles

Definitions

  • This disclosure relates to a stator, an electric motor, a compressor, and a refrigeration cycle device.
  • the stator of an electric motor has a stator core and windings.
  • the stator core has multiple teeth, and slots are formed between adjacent teeth.
  • the windings are wound around the teeth and housed in the slots.
  • Patent Document 1 discloses providing a first three-phase winding on the inner layer side and a second three-phase winding on the outer layer side, each of which is delta-connected.
  • the winding portions of the U-phase, V-phase, and W-phase of the first three-phase winding skip over two teeth and are wound with concentrated winding on the teeth on both sides.
  • the second three-phase winding is wound in a similar manner.
  • This disclosure has been made to solve the above problems, and aims to simplify the wiring of the windings and improve workability.
  • the stator of the present disclosure is a stator that constitutes an electric motor together with a rotor having 10 ⁇ N magnetic poles (N is a natural number).
  • the stator has an annular stator core with 12 ⁇ N teeth arranged in the circumferential direction, an inner winding wound on each of the 12 ⁇ N teeth, and an outer winding wound outside the inner winding.
  • the inner winding and the outer winding are connected in parallel.
  • the inner winding wound on the first tooth of the 12 ⁇ N teeth and the inner winding wound on the second tooth are connected in series.
  • the outer winding wound on the first tooth and the outer winding wound on the second tooth are connected in series.
  • the inner windings wound around two teeth are connected in series, and the outer windings wound around two teeth are also connected in series, and the inner windings and outer windings are connected in parallel, making wiring easy and improving workability.
  • FIG. 1 is a cross-sectional view showing an electric motor according to a first embodiment of the present invention
  • 3 is a cross-sectional view showing the arrangement of windings in the stator of the first embodiment.
  • FIG. 2 is a diagram showing a winding portion wound around two teeth of a stator according to the first embodiment;
  • FIG. 4 is a diagram showing a connection state between an inner winding and an outer winding in the first embodiment.
  • FIG. FIG. 2 is a diagram showing a connection state of the winding parts of each phase according to the first embodiment;
  • FIG. 2 is a diagram showing conductors constituting an inner winding and an outer winding in the first embodiment.
  • 11A and 11B are diagrams illustrating another configuration example of the core segment of the first embodiment.
  • FIG. 2 is a perspective view showing a stator according to the first embodiment.
  • 2 is a perspective view showing a core segment and an insulator according to the first embodiment.
  • FIG. FIG. 2 is a perspective view showing a portion of the stator according to the first embodiment.
  • 11 is a perspective view showing another part of the stator according to the first embodiment, different from that shown in FIG. 10 .
  • 1 is a vertical cross-sectional view showing a compressor to which the electric motor of embodiment 1 can be applied;
  • FIG. 13 is a diagram showing a refrigeration cycle device including the compressor shown in FIG. 12 .
  • Embodiment 1 is a cross-sectional view showing an electric motor 100 according to a first embodiment.
  • the electric motor 100 includes a rotor 5 and an annular stator 1 provided to surround the rotor 5. An air gap is provided between the stator 1 and the rotor 5.
  • the central axis of rotation of the rotor 5 will be referred to as the axis Ax.
  • the direction of the axis Ax will be referred to as the "axial direction.”
  • the circumferential direction centered on the axis Ax will be referred to as the “circumferential direction,” and the radial direction centered on the axis Ax will be referred to as the "radial direction.”
  • the rotor 5 has a rotor core 50, a permanent magnet 55, and a shaft 60.
  • the rotor core 50 is made of a plurality of steel plates laminated in the axial direction.
  • the steel plates are, for example, electromagnetic steel plates.
  • the thickness of the steel plates is, for example, 0.1 mm to 1.0 mm.
  • a number of magnet insertion holes 51 are formed along the outer periphery of the rotor core 50.
  • the number of magnet insertion holes 51 is 10 x N (N is a natural number).
  • the magnet insertion holes 51 are formed at equal intervals in the circumferential direction.
  • One flat permanent magnet 55 is inserted into each magnet insertion hole 51.
  • the permanent magnets 55 are made of rare earth magnets.
  • the rare earth magnets are, for example, neodymium magnets containing neodymium (Nd), iron (Fe) and boron (B).
  • the permanent magnets 55 have a thickness in the radial direction of the rotor core 50, and are magnetized in that thickness direction.
  • the permanent magnet 55 placed in each magnet insertion hole 51 constitutes one magnetic pole. Since the number of magnet insertion holes 51 is 10 x N, the number of poles of the rotor 5 is 10 x N.
  • N the number of magnet insertion holes 51 (i.e., the number of permanent magnets 55) is 10, and the number of poles of the rotor 5 is 10.
  • N may be 2 or more.
  • each magnet insertion hole 51 one permanent magnet 55 is placed in each magnet insertion hole 51, but two or more permanent magnets 55 may be placed in each magnet insertion hole 51.
  • the magnet insertion hole 51 extends linearly in a plane perpendicular to the axis Ax, but it may also extend, for example, in a V-shape.
  • the rotor core 50 has a central hole 53 at its radial center.
  • the central hole 53 is a circular hole into which the shaft 60 is fixed by shrink fitting.
  • the shaft 60 is made of, for example, metal.
  • the stator 1 has an annular stator core 10 and a winding 20 wound around the stator core 10.
  • the stator core 10 is composed of a plurality of steel plates laminated in the axial direction.
  • the steel plates are, for example, electromagnetic steel plates.
  • the thickness of the steel plates is, for example, 0.1 mm to 1.0 mm.
  • the stator core 10 has a yoke 11 extending in the circumferential direction and a number of teeth 12 extending radially inward from the yoke 11.
  • the teeth 12 are arranged at equal intervals in the circumferential direction and have tooth tips 12a at their radially inner tips that face the rotor 5.
  • Slots 13, which are areas that accommodate the windings 20, are formed between the circumferentially adjacent teeth 12.
  • the stator core 10 is formed by connecting multiple split cores 10A in a ring shape.
  • Each split core 10A is a block including one tooth 12.
  • the split cores 10A are joined at a joint surface 14 formed on the yoke 11, for example by welding.
  • the arc-shaped portion of the yoke 11 that is included in one of the split cores 10A is called the yoke portion 11A.
  • the joint surfaces 14 are formed on both circumferential ends of the yoke portion 11A.
  • the split cores 10A are also called core segments.
  • the number of teeth 12 is 12 x N (N is a natural number), and the number of slots 13 is also 12 x N.
  • N 1. That is, the number of teeth 12 is 12, and the number of slots 13 is also 12.
  • N may be 2 or more.
  • the electric motor 100 of the first embodiment is therefore a 10 x N pole, 12 x N slot electric motor, and as an example, a 10 pole, 12 slot electric motor.
  • ⁇ Winding configuration> 2 is a diagram showing the arrangement of the windings 20 on the stator core 10.
  • the windings 20 are wound in a concentrated manner around each of the teeth 12 of the stator core 10.
  • An insulator 30 (FIG. 9), which will be described later, is arranged between the windings 20 and the stator core 10.
  • the winding 20 is a collective term for the U-phase winding 20U as the first phase winding, the V-phase winding 20V as the second phase winding, and the W-phase winding 20W as the third phase winding.
  • the portion wound around one tooth 12 is referred to as the "winding section.”
  • the U-phase winding 20U has four winding sections U1, U2, U3, and U4.
  • the winding sections U1 and U4 are wound clockwise (CW as shown in FIG. 5) when viewed from the rotor 5 side.
  • the winding sections U2 and U3 are wound counterclockwise (CCW as shown in FIG. 5) when viewed from the rotor 5 side.
  • the winding sections U1 and U4 are also referred to as the U-phase
  • the winding sections U2 and U3 are also referred to as the U-bar phase.
  • the V-phase winding 20V has four winding sections V1, V2, V3, and V4. Winding sections V2 and V3 are wound clockwise when viewed from the rotor 5 side. On the other hand, winding sections V1 and V4 are wound counterclockwise when viewed from the rotor 5 side. Winding sections V2 and V3 are also referred to as the V-phase, and winding sections V1 and V4 are also referred to as the V-bar phase.
  • the W-phase winding 20W has four winding sections W1, W2, W3, and W4.
  • the winding sections W1 and W4 are wound clockwise when viewed from the rotor 5 side.
  • the winding sections W2 and W3 are wound counterclockwise when viewed from the rotor 5 side.
  • the winding sections W1 and W4 are also referred to as the W-phase, and the winding sections W2 and W3 are also referred to as the W-bar phase.
  • the winding sections are arranged in the following order in the circumferential direction: U1, U2, V1, V2, W1, W2, U3, U4, V3, V4, W3, W4.
  • U1, U2, V1, V2, etc. the teeth 12 around which each winding section is wound are given the symbols U1, U2, V1, V2, etc., indicating the winding section.
  • Each winding section of windings 20U, 20V, 20W has an inner winding 21 and an outer winding 22 of the same phase.
  • the inner winding 21 is wound around the teeth 12, and the outer winding 22 is wound around the outside of the inner winding 21.
  • winding section U1 has a U-phase inner winding 21 and a U-phase outer winding 22.
  • Winding section U2 has a U-bar phase inner winding 21 and a U-bar phase outer winding 22.
  • the inner winding 21 and the outer winding 22 wound around the same tooth 12 are wound in the same direction.
  • the inner winding 21 and the outer winding 22 of the winding section U1 are wound clockwise when viewed from the rotor 5 side.
  • the inner winding 21 and the outer winding 22 of the winding section U2 are wound counterclockwise when viewed from the rotor 5 side.
  • the inner windings 21 of the same phase wound around two adjacent teeth 12 are connected in series.
  • the outer windings 22 of the same phase wound around two adjacent teeth 12 are connected in series.
  • connection section 41 the inner winding 21 of the winding section U1 and the inner winding 21 of the winding section U2 are connected in series via a connection section 41.
  • outer winding 22 of the winding section U1 and the outer winding 22 of the winding section U2 are connected in series via a connection section 42.
  • connection portion 41 is not a jumper wire, but is part of the inner winding 21.
  • the inner winding 21 of the winding portion U1 extends through the yoke 11 to the adjacent tooth 12, and is wound around that tooth 12 to form the inner winding 21 of the winding portion U2.
  • connection portion 42 is not a jumper wire, but is part of the outer winding 22.
  • the outer winding 22 of the winding portion U1 extends through the yoke 11 to the adjacent tooth 12, and is wound around that tooth 12 to form the outer winding 22 of the winding portion U2.
  • Figure 3 is a diagram showing winding sections U1 and U2 wound around two adjacent teeth 12.
  • the inner winding 21 of winding section U1 is referred to as inner winding section 211
  • the inner winding 21 of winding section U2 is referred to as inner winding section 212
  • the outer winding 22 of winding section U1 is referred to as outer winding section 221
  • the outer winding 22 of winding section U2 is referred to as outer winding section 222.
  • Figure 4 is a diagram showing the electrical connection state between the inner winding 21 and the outer winding 22. As shown in Figure 4, the inner winding 21 and the outer winding 22 are connected in parallel. In addition, the inner winding portion 211 of winding portion U1 and the inner winding portion 212 of winding portion U2 are connected in series, and the outer winding portion 221 of winding portion U1 and the outer winding portion 222 of winding portion U2 are also connected in series.
  • connection part 41 is part of the inner winding 21, and the connection part 42 is part of the outer winding 22.
  • connection part 41 is part of the inner winding 21
  • connection part 42 is part of the outer winding 22.
  • winding sections U3, U4, V3, V4, W3, and W4 also have inner windings 21 and outer windings 22 similar to those of winding sections U1 to W2.
  • the number of turns of the inner winding 21 and the outer winding 22 of each winding section is determined according to the required characteristics of the motor 100 (rotation speed, torque, etc.), the supply voltage, and the cross-sectional area of each slot 13.
  • FIG. 5 is a diagram showing an example of the connection state of the windings 20 of each phase.
  • the outer winding and inner winding of each winding section are shown together with symbols according to the direction of current flow.
  • the winding sections U1, U2 and the winding sections U3, U4 of the U phase are arranged on opposite sides of the axis Ax and are connected to each other by a jumper wire 80U.
  • the jumper wire 80U is a lead wire and extends, for example, between the winding section U2 and the winding section U3.
  • V-phase winding sections V1, V2 and the winding sections V3, V4 are arranged on opposite sides of the axis Ax and are connected to each other by a jumper wire 80V.
  • the jumper wire 80V is a lead wire and extends, for example, between the winding section V2 and the winding section V3.
  • the W-phase windings W1, W2 and W3, W4 are arranged on opposite sides of the axis Ax and are connected to each other by a jumper wire 80W.
  • the jumper wire 80W is a lead wire and extends, for example, between the windings W2 and W3.
  • winding sections U4, V4, and W4 are connected to neutral terminal N by jumper wire 81 shown in FIG. 5.
  • U-phase input terminal 82U is connected to winding section U1
  • V-phase input terminal 82V is connected to winding section V1
  • W-phase input terminal 82W is connected to winding section W1.
  • windings 20U, 20V, and 20W are connected in a Y-connection.
  • wiring example shown in Figure 5 is merely one example, and other wiring connections are possible.
  • a delta connection may be used instead of a wye connection.
  • FIG. 6 is a diagram showing the conductors 21a, 22a that make up the inner winding 21 and the outer winding 22.
  • the conductor 21a that makes up the inner winding 21 has a conductor made of copper or aluminum and an insulating coating that covers the conductor.
  • the outer diameter of the conductor portion of the conductor 21a is D1. Because the thickness of the insulating coating is small, the outer diameter D1 can also be considered to be the outer diameter of the conductor 21a.
  • the conductor 22a that constitutes the outer winding 22 has a conductor made of copper or aluminum and an insulating coating that covers the conductor.
  • the outer diameter of the conductor portion of the conductor 22a is D2. Because the thickness of the insulating coating is small, the outer diameter D2 can also be considered as the outer diameter of the conductor 22a.
  • the outer diameter D2 of the conductor 22a of the outer winding 22 is larger than the outer diameter D1 of the conductor 21a of the inner winding 21.
  • the cross-sectional area of the conductor 22a of the outer winding 22 is larger than the cross-sectional area of the conductor 21a of the inner winding 21.
  • the outer winding 22 is wound further outward than the inner winding 21, and therefore has a longer circumference than the inner winding 21.
  • the tooth 12 wound with the inner winding 21 of the same phase and the outer winding 22 of the same phase one may be referred to as the "first tooth” and the other as the “second tooth.”
  • the tooth 12 wound with the inner winding 21 and outer winding 22 of the winding section U1 may be referred to as the "first tooth”
  • the tooth 12 wound with the inner winding 21 and outer winding 22 of the winding section U2 may be referred to as the "second tooth.”
  • stator core 10 is divided into 12 ⁇ N divided cores (core segments) 10A, each of which includes one tooth 12.
  • core segments core segments
  • stator core 10 is not limited to this configuration.
  • FIG. 7 is a diagram showing a coupled core (core segment) 10B including two teeth 12.
  • the coupled core 10B is formed by combining two of the split cores 10A described above.
  • a split surface 15 is formed on the opposing ends of the yoke portions 11A of the two split cores 10A.
  • a connecting portion 16 that connects the two split cores 10A is formed on the outer periphery of the split surface 15.
  • the connecting portion 16 is, for example, a thin-walled portion.
  • a joining surface 14 is formed at the end of each yoke portion 11A opposite the dividing surface 15, where the connecting core 10B is joined.
  • the two teeth 12 of the linked core 10B are wound with windings of the same phase, for example, U-phase windings U1 and U2.
  • the inner winding 21 wound on one tooth 12 and the inner winding 21 wound on the other tooth 12 are connected in series, and the outer winding 22 wound on one tooth 12 and the outer winding 22 wound on the other tooth 12 are connected in series.
  • the inner winding 21 and outer winding 22 of the same phase can be wound around the two teeth 12 of one connected core 10B, simplifying winding processing and further improving workability.
  • the number of connected cores 10B that make up the stator core 10 is half the number of teeth 12, or 6 x N, which makes it easier to handle the connected cores 10B and assemble the stator core 10.
  • coupled core 10B shown in FIG. 7 has two teeth 12, the coupled core 10B may have three or more teeth 12.
  • Fig. 8 is a perspective view showing the stator 1.
  • Fig. 9 is a view showing a split core 10A of the stator core 10 and an insulator 30 as an insulating part attached thereto.
  • Fig. 10 is a view of the stator 1 as seen from the direction indicated by the arrow A in Fig. 9.
  • Fig. 11 is a view of the stator 1 as seen from the direction indicated by the arrow B in Fig. 9.
  • the insulator 30 has a body portion 33 that surrounds the teeth 12, an outer wall portion 31 located radially outside the body portion 33, and an inner wall portion 32 located radially inside the body portion 33.
  • the winding 20 ( Figure 8) is wound around the body 33.
  • the outer wall 31 guides the winding 20 from the radial outside, and the inner wall 32 guides the winding 20 from the radial inside.
  • the outer wall portion 31 is formed with a groove portion 31a as a wire passage for passing the windings 20, etc.
  • the outer wall portion 31 is also formed with a holding portion 31b for holding the jumper wires 81, etc.
  • the inner wall portion 32 is formed with wire guides 32a, 32b for guiding the windings 20, etc.
  • connection 42 between the outer winding 22 of winding section V3 and the outer winding 22 of winding section V4 extends outside the outer wall section 31. Also, as shown in FIG. 11, the connection 42 between the outer winding 22 of winding section U1 and the outer winding 22 of winding section U2 extends outside the outer wall section 31.
  • connection portion 41 between the inner windings 21 of the same phase wound around two adjacent teeth 12 extends outside the outer wall portion 31.
  • connection portion 42 between the outer windings 22 of the same phase wound around two adjacent teeth 12 also extends outside the outer wall portion 31.
  • the crossover wires 80U, 80V, and 80W extend along the inner wall portion 32 or the outer wall portion 31.
  • the crossover wire 81 is held, for example, by a holding portion 31b (FIG. 8) provided on the outer wall portion 31.
  • the input terminals 82U, 82V, and 82W are attached to the outer wall portion 31.
  • connection parts 41, 42, jumper wires 80U, 80V, 80W, jumper wire 81, and input terminals 82U, 82V, 82W described here is merely an example and can be changed as appropriate.
  • ⁇ Stator assembly process> In the process of assembling the stator 1, steel plates are laminated to form the split cores 10A, and the insulators 30 are attached. Next, as shown in Fig. 3, the split cores 10A are arranged in pairs, and the inner windings 21 of the same phase are wound around the two teeth 12, and the outer windings 22 of the same phase are wound around the inner windings 21.
  • the inner winding 21 wound around one tooth 12 is extended to the other tooth 12 and is also wound around the other tooth 12.
  • the outer winding 22 wound around one tooth 12 is extended to the other tooth 12 and is also wound around the other tooth 12.
  • the inner windings 21 and the outer windings 22 are wound around the teeth 12 of the two split cores 10A, the inner windings 21 are connected to each other at the connection parts 41, and the outer windings 22 are connected to each other at the connection parts 42.
  • 12 x N split cores 10A are assembled into a ring shape and joined at the joint surfaces 14 by welding or the like to obtain the stator core 10. Furthermore, the jumper wires 80U, 80V, 80W and jumper wire 81 shown in FIG. 5 are wired, and input terminals 82U, 82V, 82W are attached to complete the stator 1.
  • embodiment 1 As shown in Fig. 2, the inner windings 21 wound around two teeth 12 are connected in series, and the outer windings 22 wound around two teeth 12 are also connected in series, and these inner windings 21 and outer windings 22 are connected in parallel.
  • the inner winding 21 wound around the two teeth 12 is connected in series
  • the outer winding 22 is also connected in series
  • the inner winding 21 and the outer winding 22 are connected in parallel, so the number of terminals that need to be connected in the inner winding 21 and the outer winding 22 is small. This requires fewer jumper wires, and wiring can be easily performed. This improves workability.
  • the inner windings 21 wound around the two teeth 12 are connected in series, and the outer windings 22 are also connected in series, so electrical resistance can be reduced compared to when the inner windings 21 are connected separately for each tooth 12, and the outer windings 22 are also connected separately. As a result, copper loss can be reduced, and motor efficiency can be improved.
  • the inner winding 21 of the same phase and the outer winding 22 of the same phase can be wound around two adjacent teeth 12. Therefore, the inner winding 21 and the outer winding 22 can be wound so as not to straddle other teeth 12, and the length of the connection parts 41, 42 is shortened. This simplifies the process of arranging the connection parts 41, 42 so as not to interfere with other windings, improving workability.
  • connection parts 41, 42 because the inner windings 21 wound around the two teeth 12 are connected to each other and the outer windings 22 are connected to each other, there is no need to cross the connection parts 41, 42, making it easier to arrange the connection parts 41, 42. As a result, workability is further improved.
  • the inner winding 21 wound around one of the two teeth 12 extends to the other tooth 12 and is wound around the other tooth 12 to form the inner winding 21 of the other tooth 12.
  • the outer winding 22 wound around one of the two teeth 12 extends to the other tooth 12 and is wound around the other tooth 12 to form the outer winding 22 of the other tooth 12.
  • the outer winding 22 is wound outside the inner winding 21, so it has a longer circumference than the inner winding 21. If the cross-sectional areas of the conductor 21a of the inner winding 21 and the conductor 22a of the outer winding 22 are the same, the electrical resistance of the outer winding 22 (more specifically, the electrical resistance of the conductor 22a) will be greater than the electrical resistance of the inner winding 21 (more specifically, the electrical resistance of the conductor 21a). If the electrical resistances of the inner winding 21 and the outer winding 22 differ, a circulating current will flow when the two are connected in parallel due to the difference in voltage drop, which may increase copper loss.
  • the electrical resistance of the outer winding 22 and the electrical resistance of the inner winding 21 can be made closer to each other, improving the imbalance in electrical resistance. This makes it possible to suppress the generation of circulating currents when the inner winding 21 and the outer winding 22 are connected in parallel, and to reduce copper loss.
  • the stator core 10 is made by combining 12 x N split cores 10A, each with one tooth 12, in the circumferential direction. Therefore, the split cores 10A are lined up in pairs (see Figure 3), and the same-phase inner winding 21 and the same-phase outer winding 22 are wound around the teeth 12.
  • the stator core 10 is then obtained by assembling the 12 x N split cores 10A into a ring shape. This further improves workability.
  • stator core 10 is a circumferential combination of 6 x N connected cores 10B, each having two teeth 12 (see FIG. 7), the inner winding 21 of the same phase and the outer winding 22 of the same phase are wound around the two teeth 12 of each connected core 10B, and then the 6 x N connected cores 10B are assembled into a ring shape to obtain the stator core 10. Because the number of connected cores 10B is half the number of teeth 12, handling of the connected cores 10B and assembly of the stator core 10 are made easier, further improving workability.
  • connection 41 between the inner winding 21 wound around the two teeth 12 and the connection 42 between the outer winding 22 wound around the two teeth 12 are wound along the insulator 30 attached to the stator core 10, so that the connection 41, 42 can be routed so as not to protrude radially outward from the stator core 10.
  • the stator 1 of the first embodiment is a stator 1 that constitutes an electric motor 100 together with the rotor 5 having 10 ⁇ N magnetic poles (N is a natural number), and has an annular stator core 10 on which 12 ⁇ N teeth 12 are arranged in the circumferential direction, an inner winding 21 wound around each of the 12 ⁇ N teeth 12, and an outer winding 22 wound around the inner winding 21.
  • the inner winding 21 and the outer winding 22 are connected in parallel, and the inner winding 21 wound around one tooth 12 (first tooth) and the inner winding 21 wound around the other tooth 12 (second tooth) of the two teeth 12 are connected in series, and the outer winding 22 wound around the one tooth 12 and the outer winding 22 wound around the other tooth 12 are connected in series.
  • This configuration reduces the number of terminals that require wiring work, simplifies the wiring work, and improves workability.
  • the inner windings 21 wound around the two teeth 12 are connected in series, and the outer windings 22 are connected in series, so the electrical resistance of the inner windings 21 and the outer windings 22 can be reduced. This reduces copper loss and improves motor efficiency.
  • the number of teeth 12 is 12 x N and the number of poles of the rotor 5 is 10 x N, it is possible to wind the inner winding 21 of the same phase and the outer winding 22 of the same phase around two adjacent teeth 12.
  • the inner winding 21 and the outer winding 22 can be wound without straddling other teeth 12, further improving workability.
  • the first embodiment described above can be modified as appropriate.
  • the inner windings 21 wound around two adjacent teeth 12 are connected in series, and the outer windings 22 wound around two adjacent teeth 12 are connected in series, but the two teeth 12 do not necessarily have to be adjacent to each other.
  • the inner windings 21 wound around two adjacent teeth 12 on either side of one tooth 12 may be connected in series, and the outer windings 22 wound around the two adjacent teeth 12 may be connected in series.
  • connection portion 41 is part of the inner winding 21, and the connection portion 42 is part of the outer winding 22, but the connection portion 41 may be formed of a lead wire that is a separate member from the inner winding 21, and the connection portion 42 may be formed of a lead wire that is a separate member from the outer winding 22.
  • the cross-sectional area of the conductor 22a of the outer winding 22 is larger than the cross-sectional area of the conductor 21a of the inner winding 21, but the cross-sectional areas may be reversed, or the cross-sectional areas may be the same.
  • a compressor 300 to which the electric motor 100 can be applied will be described.
  • Fig. 12 is a vertical cross-sectional view showing the compressor 300 equipped with the electric motor 100.
  • the compressor 300 is a rotary compressor in this example, but may be a scroll compressor.
  • the compressor 300 includes a sealed container 307, a compression mechanism 301 disposed within the sealed container 307, and an electric motor 100 that drives the compression mechanism 301.
  • the compression mechanism 301 has a cylinder 302 with a cylinder chamber 303, a rolling piston 304 fixed to the shaft 60 of the electric motor 100, a vane that divides the inside of the cylinder chamber 303 into an intake side and a compression side, and an upper frame 305 and a lower frame 306 into which the shaft 60 is inserted and which close the axial end faces of the cylinder chamber 303.
  • An upper discharge muffler 308 and a lower discharge muffler 309 are attached to the upper frame 305 and the lower frame 306, respectively.
  • the sealed container 307 is a cylindrical container. Refrigeration oil (not shown) that lubricates each sliding part of the compression mechanism 301 is stored in the bottom of the sealed container 307.
  • the shaft 60 is rotatably supported by the upper frame 305 and the lower frame 306, which serve as bearings.
  • the cylinder 302 has a cylinder chamber 303 inside, and the rolling piston 304 rotates eccentrically within the cylinder chamber 303.
  • the shaft 60 has an eccentric shaft portion, and the rolling piston 304 is fitted into the eccentric shaft portion.
  • the stator 1 of the electric motor 100 is assembled inside the sealed container 307 by a method such as shrink fitting, press fitting, or welding. Power is supplied to the windings 20 of the stator 1 from glass terminals 311 fixed to the sealed container 307.
  • the shaft 60 is fixed to the rotor core 50 as described above.
  • An accumulator 310 is attached to the outside of the sealed container 307. Refrigerant gas flows into the accumulator 310 from the refrigerant circuit via a suction pipe 314. When liquid refrigerant flows in together with the refrigerant gas from the suction pipe 314, the liquid refrigerant is stored in the accumulator 310, and the refrigerant gas is supplied to the compressor 300.
  • a suction pipe 313 is fixed to the sealed container 307, and refrigerant gas is supplied from the accumulator 310 to the cylinder 302 via this suction pipe 313.
  • a discharge pipe 312 that discharges the refrigerant to the outside is provided at the top of the sealed container 307.
  • the refrigerant for the compressor 300 may be, for example, R410A, R407C, or R22, but from the perspective of preventing global warming, it is preferable to use a refrigerant with a low GWP (global warming potential).
  • GWP global warming potential
  • the following refrigerants can be used as refrigerants with a low GWP.
  • a halogenated hydrocarbon having a carbon double bond in its composition such as HFO (Hydro-Fluoro-Orefin)-1234yf (CF 3 CF ⁇ CH 2 ), can be used.
  • the GWP of HFO-1234yf is 4.
  • Hydrocarbons having carbon double bonds in their composition such as R1270 (propylene), may also be used.
  • R1270 has a GWP of 3, which is lower than HFO-1234yf, but is more flammable than HFO-1234yf.
  • a mixture containing at least one of a halogenated hydrocarbon having a carbon-carbon double bond in its composition or a hydrocarbon having a carbon-carbon double bond in its composition for example, a mixture of HFO-1234yf and R32 may be used.
  • the above-mentioned HFO-1234yf is a low-pressure refrigerant and tends to cause large pressure loss, which may lead to a decrease in the performance of the refrigeration cycle (especially the evaporator). For this reason, it is practically desirable to use a mixture of HFO-1234yf and R32 or R41, which are refrigerants at higher pressures than HFO-1234yf.
  • the operation of the compressor 300 is as follows. Refrigerant gas supplied from the accumulator 310 is supplied through the suction pipe 313 into the cylinder chamber 303 of the cylinder 302. When the electric motor 100 is driven by supplying current to the windings 20, the shaft 60 rotates together with the rotor 5. Then, the rolling piston 304 fitted to the shaft 60 rotates eccentrically within the cylinder chamber 303, compressing the refrigerant within the cylinder chamber 303.
  • the refrigerant compressed in the cylinder chamber 303 passes through the discharge mufflers 308 and 309, and then through the gap or through-hole (not shown) between the rotor 5 and the stator 1, and rises inside the sealed container 307.
  • the refrigerant that has risen inside the sealed container 307 is discharged from the discharge pipe 312 and supplied to the high-pressure side of the refrigeration cycle.
  • the electric motor 100 of the first embodiment has high motor efficiency due to the reduced electrical resistance of the windings 20. Therefore, by using the electric motor 100 as the driving source of the compressor 300, the operating efficiency of the compressor 300 can be improved.
  • the compressor 300 shown in FIG. 12 is a single rotary compressor having a single cylinder 302, but it may also be a twin rotary compressor having two cylinders with opposite eccentric directions.
  • the electric motor 100 of the first embodiment can improve the operating efficiency when used in any type of compressor.
  • a refrigeration cycle apparatus 400 having the compressor 300 shown in Fig. 12 will be described.
  • Fig. 13 is a diagram showing the refrigeration cycle apparatus 400.
  • the refrigeration cycle apparatus 400 is, for example, an air conditioner, but is not limited thereto, and may be, for example, a refrigerator.
  • the refrigeration cycle device 400 shown in FIG. 13 includes a compressor 401, a condenser 402 that condenses the refrigerant, a pressure reducing device 403 that reduces the pressure of the refrigerant, and an evaporator 404 that evaporates the refrigerant.
  • the compressor 401, the condenser 402, and the pressure reducing device 403 are provided in the outdoor unit 410, and the evaporator 404 is provided in the indoor unit 420.
  • the compressor 401, condenser 402, pressure reducing device 403, and evaporator 404 are connected by refrigerant piping 407 to form a refrigerant circuit.
  • the compressor 401 is formed by the compressor 300 shown in FIG. 12.
  • the refrigeration cycle device 400 also includes an outdoor blower 405 facing the condenser 402, and an indoor blower 406 facing the evaporator 404.
  • the operation of the refrigeration cycle device 400 is as follows.
  • the compressor 401 compresses the sucked refrigerant and sends it out as high-temperature, high-pressure refrigerant gas.
  • the condenser 402 exchanges heat between the refrigerant sent out from the compressor 401 and the outdoor air sent by the outdoor blower 405, condenses the refrigerant, and sends it out as liquid refrigerant.
  • the pressure reducing device 403 expands the liquid refrigerant sent out from the condenser 402, and sends it out as low-temperature, low-pressure liquid refrigerant.
  • the evaporator 404 exchanges heat between the low-temperature, low-pressure liquid refrigerant sent from the pressure reducing device 403 and the indoor air, evaporating the refrigerant and sending it out as refrigerant gas.
  • the air from which the heat has been removed by the evaporator 404 is supplied by the indoor blower 406 to the room, which is the space to be air-conditioned.
  • the compressor 401 of the refrigeration cycle device 400 is equipped with the electric motor 100 of the first embodiment, and the electric motor 100 has high motor efficiency. Therefore, by using the electric motor 100 as the driving source of the compressor 300 of the refrigeration cycle device 400, the operating efficiency of the refrigeration cycle device 400 can be improved.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Windings For Motors And Generators (AREA)
PCT/JP2022/040310 2022-10-28 2022-10-28 固定子、電動機、圧縮機および冷凍サイクル装置 Ceased WO2024089866A1 (ja)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005348522A (ja) * 2004-06-03 2005-12-15 Hitachi Ltd 電動パワーステアリング用モータおよびその製造方法
WO2007052385A1 (ja) * 2005-11-01 2007-05-10 Matsushita Electric Industrial Co., Ltd. モータとそのモータに使用されるステータの製造方法
JP2007202263A (ja) * 2006-01-25 2007-08-09 Hitachi Ltd 電動パワーステアリング用モータ
JP2008301652A (ja) * 2007-06-01 2008-12-11 Mitsubishi Electric Corp 永久磁石式回転電機およびそれを用いた電動パワーステアリング装置
WO2012039028A1 (ja) * 2010-09-22 2012-03-29 三菱電機株式会社 回転電機およびその製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005348522A (ja) * 2004-06-03 2005-12-15 Hitachi Ltd 電動パワーステアリング用モータおよびその製造方法
WO2007052385A1 (ja) * 2005-11-01 2007-05-10 Matsushita Electric Industrial Co., Ltd. モータとそのモータに使用されるステータの製造方法
JP2007202263A (ja) * 2006-01-25 2007-08-09 Hitachi Ltd 電動パワーステアリング用モータ
JP2008301652A (ja) * 2007-06-01 2008-12-11 Mitsubishi Electric Corp 永久磁石式回転電機およびそれを用いた電動パワーステアリング装置
WO2012039028A1 (ja) * 2010-09-22 2012-03-29 三菱電機株式会社 回転電機およびその製造方法

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