WO2022014031A1 - 固定子、電動機、圧縮機、及び空気調和機 - Google Patents

固定子、電動機、圧縮機、及び空気調和機 Download PDF

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Publication number
WO2022014031A1
WO2022014031A1 PCT/JP2020/027798 JP2020027798W WO2022014031A1 WO 2022014031 A1 WO2022014031 A1 WO 2022014031A1 JP 2020027798 W JP2020027798 W JP 2020027798W WO 2022014031 A1 WO2022014031 A1 WO 2022014031A1
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WIPO (PCT)
Prior art keywords
coils
phase
coil
stator core
phase coils
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Ceased
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PCT/JP2020/027798
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English (en)
French (fr)
Japanese (ja)
Inventor
淳史 石川
篤 松岡
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to CN202080102866.7A priority Critical patent/CN115917930A/zh
Priority to US17/999,088 priority patent/US20230208232A1/en
Priority to JP2022536086A priority patent/JP7370468B2/ja
Priority to PCT/JP2020/027798 priority patent/WO2022014031A1/ja
Publication of WO2022014031A1 publication Critical patent/WO2022014031A1/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
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • 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
    • H02K3/28—Layout of windings or of connections between windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/06—Embedding prefabricated windings in the machines
    • H02K15/062—Windings in slots; Salient pole windings
    • H02K15/065—Windings consisting of complete sections, e.g. coils or waves
    • H02K15/067—Windings consisting of complete sections, e.g. coils or waves inserted in parallel to the axis of the slots or inter-polar channels
    • H02K15/068—Strippers; Embedding windings by strippers

Definitions

  • This disclosure relates to a stator for motors.
  • a stator having a three-phase coil is known (for example, Patent Document 1).
  • the stator core disclosed in Patent Document 1 has 24 slots, the three-phase coil forms eight poles, and the number of slots for one pole is three.
  • the coils of each phase are arranged in every three slots, and are attached to the stator core by lap winding, and two coils of the same phase are arranged in each slot.
  • this stator has the advantage that 100% of the magnetic flux from the rotor can be used.
  • the object of the present disclosure is to reduce the winding coefficient of harmonics without significantly impairing the winding coefficient of the fundamental wave in the stator.
  • the stator is A stator core with 9 x n slots (n is an integer of 1 or more) and It is attached to the stator core by distributed winding, and is equipped with a three-phase coil that forms 4 ⁇ n magnetic poles.
  • the three-phase coil has 2 ⁇ n U-phase coils, 2 ⁇ n V-phase coils, and 2 ⁇ n W-phase coils at the coil ends of the three-phase coil.
  • the 2 ⁇ n U-phase coils are connected in series and The 2 ⁇ n V-phase coils are connected in series and The 2 ⁇ n W-phase coils are connected in series and Each of the 2 ⁇ n U-phase coils, the 2 ⁇ n V-phase coils, and the 2 ⁇ n W-phase coils has nths arranged in the stator core at a 2-slot pitch. It includes one coil and n second coils arranged in the stator core at a 3-slot pitch. The n first coils are arranged at equal intervals at 360 / n degrees in the circumferential direction at the coil end.
  • the n second coils are arranged at equal intervals at 360 / n degrees in the circumferential direction at the coil end. Assuming that the number of turns of each of the n first coils is N1 and the number of turns of each of the n second coils is N2, 0.928 ⁇ N1 / N2 ⁇ 2 or 2 ⁇ N1 / N2 ⁇ 3. 294 is satisfied.
  • Stator according to other aspects of the present disclosure A stator core with 9 x n slots (n is an integer of 1 or more) and It is attached to the stator core by distributed winding, and is equipped with a three-phase coil that forms 4 ⁇ n magnetic poles.
  • the three-phase coil has 2 ⁇ n U-phase coils, 2 ⁇ n V-phase coils, and 2 ⁇ n W-phase coils at the coil ends of the three-phase coil.
  • the 2 ⁇ n U-phase coils are connected in series and The 2 ⁇ n V-phase coils are connected in series and The 2 ⁇ n W-phase coils are connected in series and
  • Each of the 2 ⁇ n U-phase coils, the 2 ⁇ n V-phase coils, and the 2 ⁇ n W-phase coils has nths arranged in the stator core at a 2-slot pitch. It includes one coil and n second coils arranged in the stator core at a 3-slot pitch.
  • the n first coils are arranged at equal intervals at 360 / n degrees in the circumferential direction at the coil end.
  • the n second coils are arranged at equal intervals at 360 / n degrees in the circumferential direction at the coil end. Assuming that the number of turns of each of the n first coils is N1 and the number of turns of each of the n second coils is N2, 1.117 ⁇ N1 / N2 ⁇ 1.634 or 2.244 ⁇ Satisfy N1 / N2 ⁇ 2.876.
  • a stator core with 9 x n slots (n is an integer of 1 or more) and It is attached to the stator core by distributed winding, and is equipped with a three-phase coil that forms 4 ⁇ n magnetic poles.
  • the three-phase coil has 2 ⁇ n U-phase coils, 2 ⁇ n V-phase coils, and 2 ⁇ n W-phase coils at the coil ends of the three-phase coil.
  • the 2 ⁇ n U-phase coils are connected in series and The 2 ⁇ n V-phase coils are connected in series and The 2 ⁇ n W-phase coils are connected in series and Each of the 2 ⁇ n U-phase coils, the 2 ⁇ n V-phase coils, and the 2 ⁇ n W-phase coils has nths arranged in the stator core at a 2-slot pitch. It includes one coil and n second coils arranged in the stator core at a 3-slot pitch. The n first coils are arranged at equal intervals at 360 / n degrees in the circumferential direction at the coil end.
  • the n second coils are arranged at equal intervals at 360 / n degrees in the circumferential direction at the coil end. Assuming that the number of turns of each of the n first coils is N1 and the number of turns of each of the n second coils is N2, 1.347 ⁇ N1 / N2 ⁇ 2.532 is satisfied.
  • Stator according to other aspects of the present disclosure A stator core with 9 x n slots (n is an integer of 1 or more) and It is attached to the stator core by distributed winding, and is equipped with a three-phase coil that forms 4 ⁇ n magnetic poles.
  • the three-phase coil has 2 ⁇ n U-phase coils, 2 ⁇ n V-phase coils, and 2 ⁇ n W-phase coils at the coil ends of the three-phase coil.
  • the 2 ⁇ n U-phase coils are connected in series and The 2 ⁇ n V-phase coils are connected in series and The 2 ⁇ n W-phase coils are connected in series and
  • Each of the 2 ⁇ n U-phase coils, the 2 ⁇ n V-phase coils, and the 2 ⁇ n W-phase coils has nths arranged in the stator core at a 2-slot pitch. It includes one coil and n second coils arranged in the stator core at a 3-slot pitch.
  • the n first coils are arranged at equal intervals at 360 / n degrees in the circumferential direction at the coil end.
  • the n second coils are arranged at equal intervals at 360 / n degrees in the circumferential direction at the coil end. Assuming that the number of turns of each of the n first coils is N1 and the number of turns of each of the n second coils is N2, 0.928 ⁇ N1 / N2 ⁇ 2 is satisfied.
  • Stator according to other aspects of the present disclosure
  • the three-phase coil has 2 ⁇ n U-phase coils, 2 ⁇ n V-phase coils, and 2 ⁇ n W-phase coils at the coil ends of the three-phase coil.
  • the 2 ⁇ n U-phase coils are connected in series and The 2 ⁇ n V-phase coils are connected in series and The 2 ⁇ n W-phase coils are connected in series and
  • Each of the 2 ⁇ n U-phase coils, the 2 ⁇ n V-phase coils, and the 2 ⁇ n W-phase coils has nths arranged in the stator core at a 2-slot pitch. It includes one coil and n second coils arranged in the stator core at a 3-slot pitch.
  • the n first coils are arranged at equal intervals at 360 / n degrees in the circumferential direction at the coil end.
  • the n second coils are arranged at equal intervals at 360 / n degrees in the circumferential direction at the coil end. Assuming that the number of turns of each of the n first coils is N1 and the number of turns of each of the n second coils is N2, 2 ⁇ N1 / N2 ⁇ 3.294 is satisfied.
  • the motor according to another aspect of the present disclosure is With the stator It is provided with a rotor arranged inside the stator.
  • the compressor according to another aspect of the present disclosure is With a closed container With the compression device arranged in the closed container, The electric motor for driving the compression device is provided.
  • the air conditioner according to another aspect of the present disclosure is With the compressor Equipped with a heat exchanger.
  • FIG. It is a top view which shows schematic structure of the electric motor which concerns on Embodiment 1.
  • FIG. It is a top view which shows the structure of a stator schematically. It is a figure which shows schematically a three-phase coil. It is a figure which shows the example of the insertion instrument for inserting a three-phase coil into a stator core. It is a figure which shows the example of the process of inserting a three-phase coil into a stator core. It is a figure which shows the example of the process of inserting a three-phase coil into a stator core. It is a top view which shows the electric motor which concerns on a comparative example. It is a figure which shows the arrangement of the three-phase coil in the slot of the stator shown in FIG. 7.
  • FIG. 1 It is a top view which shows schematic structure of the stator of the electric motor which concerns on a modification. It is a figure which shows the arrangement of the three-phase coil in the slot of the electric motor which concerns on a modification. It is a figure which shows schematic the 3 phase coil of the electric motor which concerns on a modification. It is sectional drawing which shows schematic structure of the compressor which concerns on Embodiment 2. FIG. It is a figure which shows schematic the structure of the refrigerating and air-conditioning apparatus which concerns on Embodiment 3. FIG.
  • Embodiment 1 In the xyz Cartesian coordinate system shown in each figure, the z-axis direction (z-axis) indicates a direction parallel to the axis Ax of the electric motor 1, and the x-axis direction (x-axis) is orthogonal to the z-axis direction (z-axis).
  • the y-axis direction (y-axis) indicates a direction orthogonal to both the z-axis direction and the x-axis direction.
  • the axis Ax is the center of the stator 3 and the center of rotation of the rotor 2.
  • the direction parallel to the axis Ax is also referred to as "axial direction of rotor 2" or simply "axial direction”.
  • the radial direction is the radial direction of the rotor 2 or the stator 3 and is a direction orthogonal to the axis Ax.
  • the xy plane is a plane orthogonal to the axial direction.
  • the arrow D1 indicates the circumferential direction about the axis Ax.
  • the circumferential direction of the rotor 2 or the stator 3 is also simply referred to as "circumferential direction”.
  • FIG. 1 is a top view schematically showing the structure of the motor 1 according to the first embodiment.
  • the motor 1 has a rotor 2 having a plurality of magnetic poles, a stator 3, and a shaft 4 fixed to the rotor 2.
  • the electric motor 1 is, for example, a permanent magnet synchronous motor.
  • the rotor 2 is rotatably arranged inside the stator 3. There is an air gap between the rotor 2 and the stator 3. The rotor 2 rotates about the axis Ax.
  • the rotor 2 has a rotor core 21 and a plurality of permanent magnets 22.
  • the rotor core 21 has a plurality of magnet insertion holes 211 and a shaft hole 212 in which the shaft 4 is arranged.
  • the rotor core 21 may further have at least one flux barrier portion that is a space communicating with each magnet insertion hole 211.
  • the rotor 2 has a plurality of permanent magnets 22.
  • Each permanent magnet 22 is arranged in each magnet insertion hole 211.
  • One permanent magnet 22 forms one magnetic pole of the rotor 2, that is, an N pole or an S pole. However, two or more permanent magnets 22 may form one magnetic pole of the rotor 2.
  • one permanent magnet 22 forming one magnetic pole of the rotor 2 is arranged straight in the xy plane.
  • a set of permanent magnets 22 forming one magnetic pole of the rotor 2 may be arranged so as to have a V shape.
  • each magnetic pole of the rotor 2 is located at the center of the north pole or the south pole of the rotor 2.
  • Each magnetic pole of the rotor 2 (also simply referred to as “each magnetic pole” or “magnetic pole”) means a region serving as an N pole or an S pole of the rotor 2.
  • FIG. 2 is a top view schematically showing the structure of the stator 3.
  • FIG. 3 is a diagram schematically showing a three-phase coil 32. As shown in FIGS. 1 and 2, the stator 3 has a stator core 31 and a three-phase coil 32 attached to the stator core 31 in a distributed winding manner.
  • the three-phase coil 32 (that is, the coil of each phase) has a coil side arranged in the slot 311 and a coil end 32a not arranged in the slot 311. Each coil end 32a is an end portion of the three-phase coil 32 in the axial direction.
  • the three-phase coil 32 has 2 ⁇ n U-phase coils 32U, 2 ⁇ n V-phase coils 32V, and 2 ⁇ n W-phase coils 32W at each coil end 32a (FIG. 1). That is, the three-phase coil 32 has three phases, a first phase, a second phase, and a third phase.
  • the first phase is the U phase
  • the second phase is the V phase
  • the third phase is the W phase.
  • each of the three phases is referred to as a U phase, a V phase, and a W phase.
  • the 2 ⁇ n coils 32U are also referred to as “U-phase coil group”, the 2 ⁇ n V-phase coils 32V are also referred to as “V-phase coil group”, and the 2 ⁇ n W-phase coils 32W are referred to as “W-phase coils”. Also called a group.
  • Each of the U-phase coil group, the V-phase coil group, and the W-phase coil group is also referred to as "a coil group of each phase”.
  • the coil group of each phase includes n first coils and n second coils.
  • Each first coil is arranged on the stator core 31 at a 2-slot pitch.
  • Each second coil is arranged on the stator core 31 at a 3-slot pitch.
  • Each first coil and each second coil is also simply referred to as a "coil".
  • 2 slot pitch means "every 2 slots”. That is, the two-slot pitch means that one coil is arranged in the slot 311 every two slots. In other words, the two-slot pitch means that one coil is arranged in the slot 311 every other slot.
  • 3 slot pitch means "every 3 slots". That is, the 3-slot pitch means that one coil is arranged in the slot 311 every 3 slots. In other words, the 3-slot pitch means that one coil is arranged in slot 311 every two slots.
  • n 1. Therefore, in the example shown in FIG. 1, at the coil end 32a, the three-phase coil 32 has two U-phase coils 32U, two V-phase coils 32V, and two W-phase coils 32W.
  • the number of coils in each phase is not limited to two.
  • the stator 3 has the structure shown in FIG. 1 at the two coil ends 32a. However, the stator 3 may have the structure shown in FIG. 1 at one of the two coil ends 32a.
  • 2 ⁇ n U-phase coils 32U ie, first coil U1 and second coil U2
  • 2 ⁇ n V-phase coils 32V ie, first coil V1
  • the second coil V2 and 2 ⁇ n W-phase coils 32W (that is, the first coil W1 and the second coil W2) are connected by, for example, a Y connection.
  • the 2 ⁇ n U-phase coils 32U, the 2 ⁇ n V-phase coils 32V, and the 2 ⁇ n W-phase coils 32W are connected by a connection other than the Y connection, for example, a delta connection. good.
  • Each first coil and each second coil is also simply referred to as a coil.
  • the 2 ⁇ n U-phase coils 32U include n first coils U1 and n second coils U2.
  • the two U-phase coils 32U are composed of one first coil U1 and one second coil U2.
  • the 2 ⁇ n U-phase coils 32U are connected in series. Therefore, in the present embodiment, one first coil U1 and one second coil U2 are connected in series.
  • the first coil U1 is arranged on the stator core 31 at a pitch of 2 slots.
  • the second coil U2 is arranged on the stator core 31 at a pitch of 3 slots.
  • the first coil U1 of the U phase is arranged in two slots 311 every other slot on one end side of the stator core 31.
  • the first coil U1 of the U phase is arranged in two slots 311 with one slot 311 interposed therebetween on one end side of the stator core 31.
  • the second coil U2 of the U phase is arranged in two slots 311 every two slots on one end side of the stator core 31.
  • the second coil U2 of the U phase is arranged in two slots 311 with the two slots 311 interposed therebetween on one end side of the stator core 31.
  • the stator 3 has, for example, 0.928 ⁇ . Satisfy N1 / N2 ⁇ 2 or 2 ⁇ N1 / N2 ⁇ 3.294.
  • the 2 ⁇ n V-phase coils 32V include n first coils V1 and n second coils V2.
  • the two V-phase coils 32V are composed of one first coil V1 and one second coil V2.
  • the 2 ⁇ n V-phase coils 32V are connected in series. Therefore, in the present embodiment, one first coil V1 and one second coil V2 are connected in series.
  • the first coil V1 is arranged on the stator core 31 at a 2-slot pitch.
  • the second coil V2 is arranged on the stator core 31 at a pitch of 3 slots.
  • the first coil V1 of the V phase is arranged in two slots 311 every other slot on one end side of the stator core 31.
  • the first coil V1 of the V phase is arranged in two slots 311 with one slot 311 interposed therebetween on one end side of the stator core 31.
  • the second coil V2 of the V phase is arranged in two slots 311 every two slots on one end side of the stator core 31.
  • the second coil V2 of the V phase is arranged in two slots 311 with the two slots 311 interposed therebetween on one end side of the stator core 31.
  • the stator 3 has, for example, 0.928 ⁇ . Satisfy N1 / N2 ⁇ 2 or 2 ⁇ N1 / N2 ⁇ 3.294.
  • the 2 ⁇ n W-phase coils 32W include n first coils W1 and n second coils W2.
  • the two W-phase coils 32W are composed of one first coil W1 and one second coil W2.
  • the 2 ⁇ n W-phase coils 32W are connected in series. Therefore, in the present embodiment, one first coil W1 and one second coil W2 are connected in series.
  • the first coil W1 is arranged on the stator core 31 at a pitch of 2 slots.
  • the second coil W2 is arranged on the stator core 31 at a pitch of 3 slots.
  • the first coil W1 of the W phase is arranged in two slots 311 every other slot on one end side of the stator core 31.
  • the first coil W1 of the W phase is arranged in two slots 311 with one slot 311 interposed therebetween on one end side of the stator core 31.
  • the second coil W2 of the W phase is arranged in two slots 311 every two slots on one end side of the stator core 31.
  • the second coil W2 of the W phase is arranged in two slots 311 with the two slots 311 interposed therebetween on one end side of the stator core 31.
  • the stator 3 has, for example, 0.928 ⁇ . Satisfy N1 / N2 ⁇ 2 or 2 ⁇ N1 / N2 ⁇ 3.294.
  • FIG. 4 is a diagram showing an example of an insertion device 9 for inserting the three-phase coil 32 into the stator core 31.
  • 5 and 6 are diagrams showing an example of a process of inserting a three-phase coil into the stator core 31.
  • the three-phase coil 32 is attached to, for example, a stator core 31 prepared in advance by an insertion tool 9. In the present embodiment, the three-phase coil 32 is attached to the stator core 31 by distributed winding.
  • the three-phase coil 32 is arranged between the blades 91 of the insertion device 9 as shown in FIGS. 5 and 6.
  • the blade 91 is inserted inside the stator core 31 together with the three-phase coil 32.
  • the three-phase coil 32 is slid in the axial direction and placed in the slot 311.
  • FIG. 7 is a top view showing the electric motor 1a according to the comparative example.
  • FIG. 8 is a diagram showing the arrangement of the three-phase coil 32 in the slot of the stator 3a shown in FIG.
  • FIG. 8 is a developed view of the stator 3a shown in FIG. 7.
  • the three-phase coil 32 is lap-wound and attached to the stator core 31.
  • one side of each coil is arranged in the outer layer of slot 311 and the other side of the coil is arranged in the inner layer of the other slot 311.
  • the three-phase coil 32 when the three-phase coil 32 is attached to the stator core 31 by lap winding, it is difficult to attach the three-phase coil 32 to the stator core 31 using an insertion tool (for example, the insertion tool 9 shown in FIG. 4). .. Therefore, usually, when the three-phase coil 32 is attached to the stator core 31 by lap winding as in the comparative example, the three-phase coil 32 is attached to the stator core 31 by hand. In this case, the productivity of the stator 3 decreases.
  • an insertion tool for example, the insertion tool 9 shown in FIG. 4
  • Winding coefficient of the first coil of each phase and the winding coefficient of the second coil of each phase are different from each other. Therefore, in order to calculate the winding coefficient of the stator 3 of the motor 1, the winding coefficient of the first coil of each phase and the winding coefficient of the second coil of each phase are calculated.
  • the distributed winding coefficient of the stator 3 of the motor 1 is 1 regardless of the fundamental wave and the harmonics.
  • the winding coefficient is obtained by the product of the distributed winding coefficient and the short-knot winding coefficient. Since the distributed winding coefficient of the stator 3 of the motor 1 is 1, in the present embodiment, the winding coefficient and the short-knot winding coefficient are equal.
  • Kp_m cos ⁇ (m ⁇ ⁇ ) /2 ⁇ ⁇ (1- ⁇ ) ⁇ ⁇ ⁇ ⁇ (1)
  • ⁇ is a shortness and is defined by “coil pitch / number of slots per pole”.
  • the number of turns of the first coil of each phase is N1
  • the number of turns of the second coil of each phase is N2
  • the coefficient of short-knot winding of the first coil of each phase is Kp1
  • the number of short-knot winding of the second coil of each phase is Kp1.
  • the short-knot winding coefficient Kp of the stator 3 of the motor 1 can be obtained by the following equation (4).
  • the winding coefficient Kp1_1 of the fundamental wave of the first coil of each phase, the winding coefficient Kp2_1 of the fundamental wave of the second coil of each phase, and the winding coefficient Kp_1 of the fundamental wave of the stator 3 of the motor 1 are expressed by the equations. Using (1) and (4), it is obtained by the following equations (5), (6), and (7).
  • Kp_1 [1 / ⁇ (N1 / N2) + 1 ⁇ ] x ⁇ (N1 / N2) x
  • Kp1_1 + Kp2_1 ⁇ [1 / ⁇ (N1 / N2) +1 ⁇ ] ⁇ ⁇ (N1 / N2) ⁇ cos10 ° + cos30 ° ⁇ ⁇ ⁇ ⁇ (7)
  • FIG. 9 is a graph showing the winding coefficient of the fundamental wave.
  • FIG. 10 is a graph showing a third-order winding coefficient.
  • FIG. 11 is a graph showing the absolute value of the fifth-order winding coefficient.
  • FIG. 12 is a graph showing the absolute value of the 7th-order winding coefficient.
  • the harmonic components that should be considered in order to reduce the torque ripple, which is the main cause of vibration in the motor 1, will be described.
  • the torque of the motor 1 is proportional to the product of the induced voltage generated in the three-phase coil 32 and the motor current. For example, if both the induced voltage and the motor current are represented by an ideal sine wave, no torque ripple due to harmonics will occur in motor 1. However, when harmonics are superimposed on the induced voltage and motor current, the torque of the motor 1 pulsates and torque ripple occurs.
  • the sixth component is dominant in the electrical order. Assuming that the pole logarithm is P, the sixth-order component in the electrical order appears as a 6 ⁇ Pth-order component in the mechanical order.
  • the torque of the motor 1 is proportional to the product of the induced voltage generated in the three-phase coil 32 and the motor current. Therefore, the harmonic component of the interlinkage magnetic flux or the harmonic component of the motor current can be mentioned as the main cause of the torque ripple of the sixth order in the electric order.
  • D 7th order magnetic flux x 1st order current
  • N1 / N2 for reducing high-order harmonics (specifically, 5th and 7th orders), which are the main factors of torque ripple, are calculated.
  • the fifth-order winding coefficient Kp1_5 of the first coil of each phase, the fifth-order winding coefficient Kp2_5 of the second coil of each phase, and the fifth-order winding coefficient Kp_5 of the stator 3 of the motor 1 are expressed by the formulas. Using (1) and (4), it is obtained by the following equations (9), (10), and (11).
  • Kp_5 [1 / ⁇ (N1 / N2) + 1 ⁇ ] x ⁇ (N1 / N2) x
  • Kp1_5 + Kp2_5 ⁇ [1 / ⁇ (N1 / N2) +1 ⁇ ] ⁇ ⁇ (N1 / N2) ⁇ cos50 ° + cos150 ° ⁇ ⁇ ⁇ (11)
  • the 7th-order winding coefficient Kp1_7 of the 1st coil of each phase, the 7th-order winding coefficient Kp2_7 of the 2nd coil of each phase, and the 7th-order winding coefficient Kp_7 of the stator 3 of the motor 1 are expressed by the formulas. Using (1) and (4), it can be obtained by the following equations (13), (14), and (15).
  • Kp_7 [1 / ⁇ (N1 / N2) + 1 ⁇ ] x ⁇ (N1 / N2) x
  • Kp1_7 + Kp2_7 ⁇ [1 / ⁇ (N1 / N2) +1 ⁇ ] ⁇ ⁇ (N1 / N2) ⁇ cos70 ° + cos210 ° ⁇ ⁇ ⁇ ⁇ (15)
  • Kp_7 is ⁇ 0.061 according to the equation (16).
  • the ratio N1 / N2 for reducing the 5th-order winding coefficient and the 7th-order winding coefficient is calculated.
  • the winding coefficient Kp is regarded as a function of N1 / N2 and expressed as Kp (N1 / N2).
  • N1 / N2 2
  • the lower limit of the ratio N1 / N2 at which the fifth-order winding coefficient smaller than the fifth-order winding coefficient Kp_5 (2) can be obtained is ⁇ 5.
  • N1 / N2 2
  • the upper limit of the ratio N1 / N2 at which the 7th-order winding coefficient smaller than the 7th-order winding coefficient Kp_7 (2) can be obtained is ⁇ 7.
  • the third harmonic is a factor that generates a circulating current in the three-phase coil connected by the delta connection. Therefore, it is desirable that the third harmonic is as low as possible. As shown in FIG. 10, when N1 / N2 ⁇ 2, the third-order winding coefficient can be sufficiently reduced. Therefore, when the ratio N1 / N2 satisfies 0.928 ⁇ N1 / N2 ⁇ 2, the circulating current in the three-phase coil connected by the delta connection can be reduced.
  • the ratio N1 / N2 for further reducing the fifth-order winding coefficient is calculated.
  • the winding coefficient Kp is regarded as a function of N1 / N2 and expressed as Kp (N1 / N2).
  • ⁇ 5b be N1 / N2 for which Kp_5 (N1 / N2) ⁇ (1/2) ⁇ Kp_5 (2) is satisfied.
  • Kp_5 ( ⁇ 5b) ⁇ (1/2) ⁇ Kp_5 (2) ⁇ ⁇ ⁇ (26) ⁇ 1 / ( ⁇ 5b + 1) ⁇ ⁇ ( ⁇ 5b ⁇ cos50 ° + cos150 °) (1/2) ⁇ ⁇ 1 / (2 + 1) ⁇ ⁇ (2 ⁇ cos50 ° + cos150 °) ⁇ ⁇ ⁇ (27)
  • the ratio N1 / N2 for further reducing the 7th-order winding coefficient is calculated.
  • the winding coefficient Kp is regarded as a function of N1 / N2 and expressed as Kp (N1 / N2).
  • stator 3 of the motor 1 satisfies 1.117 ⁇ N1 / N2 ⁇ 1.634 or 2.244 ⁇ N1 / N2 ⁇ 2.876, it has at least a fifth-order winding coefficient or a seventh-order winding.
  • FIG. 13 is a graph showing the content of winding coefficients of harmonics (specifically, 5th and 7th orders) with respect to the fundamental wave.
  • FIG. 14 is a graph showing a third-order winding coefficient, a fifth-order winding coefficient, and a seventh-order winding coefficient.
  • the stator 3 of the motor 1 satisfies 1.347 ⁇ N1 / N2 ⁇ 2.532, both the fifth-order winding coefficient and the seventh-order winding coefficient are reduced. This makes it possible to reduce the content of winding coefficients of harmonics (specifically, 5th and 7th orders) with respect to the fundamental wave.
  • FIG. 15 is a top view schematically showing the structure of the electric motor 1 according to the modified example.
  • the value of "n" is different from the value of "n” described in the first embodiment.
  • n 2.
  • a configuration different from that of the first embodiment will be described. The details not explained in the modified example can be the same details as those in the first embodiment.
  • FIG. 16 is a cross-sectional view schematically showing the structure of the rotor 2 of the electric motor 1 according to the modified example.
  • the rotor 2 has a rotor core 21 and at least one permanent magnet 22.
  • the rotor 2 has 4 ⁇ n (n is an integer of 1 or more) magnetic poles. In the modified example, the rotor 2 has eight magnetic poles.
  • FIG. 17 is a top view schematically showing the structure of the stator 3 of the electric motor 1 according to the modified example.
  • FIG. 18 is a diagram showing the arrangement of the three-phase coil 32 in the slot 311 of the electric motor 1 according to the modified example.
  • FIG. 19 is a diagram schematically showing a three-phase coil 32 of the electric motor 1 according to the modified example.
  • n 2. Therefore, in the example shown in FIG. 15, at the coil end 32a, the three-phase coil 32 has four U-phase coils 32U, four V-phase coils 32V, and four W-phase coils 32W.
  • the coil group of each phase includes two first coils and two second coils.
  • Each first coil is arranged on the stator core 31 at a 2-slot pitch.
  • Each second coil is arranged on the stator core 31 at a 3-slot pitch.
  • 2 ⁇ n U-phase coils 32U ie, two first coils U1 and two second coils U2
  • 2 ⁇ n V-phase coils 32V ie, 2 ⁇ n V-phase coils 32V
  • 2 ⁇ n W-phase coils 32W ie, two first coils W1 and two second coils W2).
  • the 2 ⁇ n U-phase coils 32U include n first coils U1 and n second coils U2.
  • the four U-phase coils 32U are composed of two first coils U1 and two second coils U2.
  • the 2 ⁇ n U-phase coils 32U are connected in series. Therefore, in the modified example, the two first coils U1 and the two second coils U2 are connected in series.
  • Each first coil U1 is arranged on the stator core 31 at a pitch of 2 slots.
  • Each second coil U2 is arranged on the stator core 31 at a pitch of 3 slots.
  • n first coils U1 are arranged at equal intervals of 360 / n degrees in the circumferential direction at each coil end 32a.
  • the two first coils U1 of the U phase are arranged at equal intervals of 180 degrees in the circumferential direction at each coil end 32a.
  • the n first coils U1 are arranged at equal intervals at each coil end 32a with a deviation of 360 / n degrees from each other.
  • the two first coils U1 of the U phase are arranged at equal intervals at each coil end 32a with a deviation of 180 degrees from each other.
  • n second coils U2 are arranged at equal intervals of 360 / n degrees in the circumferential direction at each coil end 32a.
  • the two second coils U2 of the U phase are arranged at equal intervals of 180 degrees in the circumferential direction at each coil end 32a.
  • the n second coils U2 are arranged at equal intervals at each coil end 32a with a deviation of 360 / n degrees from each other.
  • the two second coils U2 of the U phase are arranged at equal intervals at each coil end 32a with a deviation of 180 degrees from each other.
  • the 2 ⁇ n V-phase coils 32V include n first coils V1 and n second coils V2.
  • the four V-phase coils 32V are composed of two first coils V1 and two second coils V2.
  • the 2 ⁇ n V-phase coils 32V are connected in series. Therefore, in the modified example, the two first coils V1 and the two second coils V2 are connected in series.
  • Each first coil V1 is arranged on the stator core 31 at a pitch of 2 slots.
  • Each second coil V2 is arranged on the stator core 31 at a pitch of 3 slots.
  • n first coils V1 are arranged at equal intervals of 360 / n degrees in the circumferential direction at each coil end 32a.
  • the two first coils V1 of the V phase are arranged at equal intervals of 180 degrees in the circumferential direction at each coil end 32a.
  • the n first coils V1 are arranged at equal intervals at each coil end 32a with a deviation of 360 / n degrees from each other.
  • the two first coils V1 of the V phase are arranged at equal intervals at each coil end 32a with a deviation of 180 degrees from each other.
  • n second coils V2 are arranged at equal intervals of 360 / n degrees in the circumferential direction at each coil end 32a.
  • the two second coils V2 of the V phase are arranged at equal intervals of 180 degrees in the circumferential direction at each coil end 32a.
  • the n second coils V2 are arranged at equal intervals at each coil end 32a with a deviation of 360 / n degrees from each other.
  • the two second coils V2 of the V phase are arranged at equal intervals at each coil end 32a with a deviation of 180 degrees from each other.
  • the 2 ⁇ n W-phase coils 32W include n first coils W1 and n second coils W2.
  • the four W-phase coils 32W are composed of two first coils W1 and two second coils W2.
  • the 2 ⁇ n W-phase coils 32W are connected in series. Therefore, in the modified example, the two first coils W1 and the two second coils W2 are connected in series.
  • Each first coil W1 is arranged on the stator core 31 at a pitch of 2 slots.
  • Each second coil W2 is arranged on the stator core 31 at a pitch of 3 slots.
  • n first coils W1 are arranged at equal intervals of 360 / n degrees in the circumferential direction at each coil end 32a.
  • the two first coils W1 of the W phase are arranged at equal intervals of 180 degrees in the circumferential direction at each coil end 32a.
  • the n first coils W1 are arranged at equal intervals at each coil end 32a with a deviation of 360 / n degrees from each other.
  • the two first coils W1 of the W phase are arranged at equal intervals at each coil end 32a with a deviation of 180 degrees from each other.
  • n second coils W2 are arranged at equal intervals of 360 / n degrees in the circumferential direction at each coil end 32a.
  • the two second coils W2 of the W phase are arranged at equal intervals of 180 degrees in the circumferential direction at each coil end 32a.
  • the n second coils W2 are arranged at equal intervals at each coil end 32a with a deviation of 360 / n degrees from each other.
  • the two second coils W2 of the W phase are arranged at equal intervals at each coil end 32a with a deviation of 180 degrees from each other.
  • FIG. 20 is a cross-sectional view schematically showing the structure of the compressor 300.
  • the compressor 300 has a motor 1 as an electric element, a closed container 307 as a housing, and a compression mechanism 305 as a compression element (also referred to as a compression device).
  • the compressor 300 is a scroll compressor.
  • the compressor 300 is not limited to the scroll compressor.
  • the compressor 300 may be a compressor other than the scroll compressor, for example, a rotary compressor.
  • the electric motor 1 in the compressor 300 is the electric motor 1 described in the first embodiment (including a modification).
  • the electric motor 1 drives the compression mechanism 305.
  • the compressor 300 further includes a subframe 308 that supports the lower end of the shaft 4 (that is, the end opposite to the compression mechanism 305 side).
  • the compression mechanism 305 is arranged in the closed container 307.
  • the compression mechanism 305 has a fixed scroll 301 having a spiral portion, a swing scroll 302 having a spiral portion forming a compression chamber between the spiral portion of the fixed scroll 301, and a compliance frame 303 holding the upper end portion of the shaft 4. And a guide frame 304 fixed to the closed container 307 and holding the compliance frame 303.
  • a suction pipe 310 penetrating the closed container 307 is press-fitted into the fixed scroll 301. Further, the closed container 307 is provided with a discharge pipe 306 for discharging the high-pressure refrigerant gas discharged from the fixed scroll 301 to the outside.
  • the discharge pipe 306 communicates with an opening provided between the compression mechanism 305 of the closed container 307 and the electric motor 1.
  • the motor 1 is fixed to the closed container 307 by fitting the stator 3 into the closed container 307.
  • the configuration of the electric motor 1 is as described above.
  • a glass terminal 309 for supplying electric power to the electric motor 1 is fixed to the closed container 307 by welding.
  • the compressor 300 Since the compressor 300 has the electric motor 1 described in the first embodiment, it has the advantages described in the first embodiment.
  • the compressor 300 has the electric motor 1 described in the first embodiment, the performance of the compressor 300 can be improved.
  • FIG. 21 is a diagram schematically showing the configuration of the refrigerating and air-conditioning apparatus 7 according to the third embodiment.
  • the refrigerating and air-conditioning device 7 can be operated for heating and cooling, for example.
  • the refrigerant circuit diagram shown in FIG. 21 is an example of a refrigerant circuit diagram of an air conditioner capable of cooling operation.
  • the refrigerating and air-conditioning device 7 has an outdoor unit 71, an indoor unit 72, and a refrigerant pipe 73 connecting the outdoor unit 71 and the indoor unit 72.
  • the outdoor unit 71 has a compressor 300, a condenser 74 as a heat exchanger, a throttle device 75, and an outdoor blower 76 (first blower).
  • the condenser 74 condenses the refrigerant compressed by the compressor 300.
  • the throttle device 75 decompresses the refrigerant condensed by the condenser 74 and adjusts the flow rate of the refrigerant.
  • the diaphragm device 75 is also referred to as a decompression device.
  • the indoor unit 72 has an evaporator 77 as a heat exchanger and an indoor blower 78 (second blower).
  • the evaporator 77 evaporates the refrigerant decompressed by the throttle device 75 to cool the indoor air.
  • the refrigerant is compressed by the compressor 300 and flows into the condenser 74.
  • the refrigerant is condensed by the condenser 74, and the condensed refrigerant flows into the throttle device 75.
  • the refrigerant is decompressed by the throttle device 75, and the decompressed refrigerant flows into the evaporator 77.
  • the refrigerant evaporates in the evaporator 77, and the refrigerant (specifically, the refrigerant gas) flows into the compressor 300 of the outdoor unit 71 again.
  • the configuration and operation of the refrigerating and air-conditioning apparatus 7 described above is an example, and is not limited to the above-mentioned example.
  • the refrigerating and air-conditioning apparatus 7 according to the third embodiment, it has the advantages described in the first embodiment.
  • the refrigerating and air-conditioning apparatus 7 according to the third embodiment has the compressor 300 according to the second embodiment, the performance of the refrigerating and air-conditioning apparatus 7 can be improved.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Windings For Motors And Generators (AREA)
PCT/JP2020/027798 2020-07-17 2020-07-17 固定子、電動機、圧縮機、及び空気調和機 Ceased WO2022014031A1 (ja)

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CN202080102866.7A CN115917930A (zh) 2020-07-17 2020-07-17 定子、电动机、压缩机以及空调机
US17/999,088 US20230208232A1 (en) 2020-07-17 2020-07-17 Stator, electric motor, compressor, and air conditioner
JP2022536086A JP7370468B2 (ja) 2020-07-17 2020-07-17 固定子、電動機、圧縮機、及び空気調和機
PCT/JP2020/027798 WO2022014031A1 (ja) 2020-07-17 2020-07-17 固定子、電動機、圧縮機、及び空気調和機

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CN114731080B (zh) * 2019-12-02 2025-10-03 三菱电机株式会社 旋转电机的定子以及旋转电机

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JPS62178757U (enExample) * 1986-05-02 1987-11-13
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US20230208232A1 (en) 2023-06-29

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