WO2019220610A1 - Stator, moteur, compresseur et dispositif de climatisation - Google Patents

Stator, moteur, compresseur et dispositif de climatisation Download PDF

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Publication number
WO2019220610A1
WO2019220610A1 PCT/JP2018/019235 JP2018019235W WO2019220610A1 WO 2019220610 A1 WO2019220610 A1 WO 2019220610A1 JP 2018019235 W JP2018019235 W JP 2018019235W WO 2019220610 A1 WO2019220610 A1 WO 2019220610A1
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Prior art keywords
winding
sectional area
end portion
cross
coil end
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PCT/JP2018/019235
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English (en)
Japanese (ja)
Inventor
恵実 塚本
浩二 矢部
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三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2020518912A priority Critical patent/JP7046170B2/ja
Priority to PCT/JP2018/019235 priority patent/WO2019220610A1/fr
Publication of WO2019220610A1 publication Critical patent/WO2019220610A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/02—Windings characterised by the conductor material
    • 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
    • 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
    • H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors

Definitions

  • the present invention relates to a stator of an electric motor.
  • the stator can be formed such that the coil end portion of the coil is in contact with the refrigerant and lubricating oil in the compressor.
  • This invention aims at improving the heat dissipation efficiency in the coil end part of a coil.
  • the stator of the present invention is formed of a material different from that of the at least one first winding, which is connected in series with the stator core, at least one first winding, and the at least one first winding. And a coil wound around the stator core, the coil having a coil end portion located outside the stator core, the coil The straight line that bisects the maximum height of the coil end part from the contact point between the coil and the stator core at the end part is defined as P1, and is the opposite side of the stator core across the straight line P1.
  • the total cross-sectional area of Kutomo one first winding and A 1, when the total cross-sectional area of the at least one first winding of the second side of the coil end portion and the A 2, (A 1 / S 1 )> (A 2 / S 2 ) is satisfied.
  • the heat radiation efficiency in the coil end portion of the coil can be improved.
  • FIG. 2 is a cross-sectional view of a bundle of coils taken along line C3-C3 shown in FIG.
  • FIG. 2 is a cross-sectional view of a bundle of coils taken along line C3-C3 shown in FIG.
  • surface which shows a cross-sectional area, a cross-sectional area ratio, an electrical resistance, an electric current, a loss, loss density, and loss density ratio about a 1st winding and a 2nd winding.
  • Embodiment 1 FIG.
  • the z-axis direction (z-axis) indicates a direction parallel to the axis Ax of the rotor 3 of the electric motor 1
  • the x-axis direction (x-axis) is the z-axis direction (z
  • 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 rotation center of the rotor 3.
  • the direction parallel to the axis Ax is also referred to as “axial direction of the rotor 3” or simply “axial direction”.
  • the radial direction is a direction orthogonal to the axis Ax.
  • FIG. 1 is a plan view schematically showing the structure of an electric motor 1 according to Embodiment 1 of the present invention.
  • An arrow D1 indicates the circumferential direction of the stator 2 around the axis Ax.
  • the arrow D1 also indicates the circumferential direction of the rotor 3 around the axis Ax.
  • the circumferential direction of the stator 2 and the rotor 3 is also simply referred to as “circumferential direction”.
  • the electric motor 1 has a stator 2 and a rotor 3.
  • the electric motor 1 is, for example, an induction motor.
  • the electric motor 1 is used for a compressor such as a scroll compressor, for example.
  • the rotor 3 is rotatably arranged inside the stator 2.
  • the stator 2 includes a stator core 21 and a coil 22 (also referred to as a stator coil).
  • the stator core 21 is formed in an annular shape.
  • the stator core 21 is formed by laminating a plurality of electromagnetic steel plates in the axial direction.
  • the plurality of electromagnetic steel sheets are fixed to each other by caulking.
  • Each of the plurality of electromagnetic steel sheets is punched into a predetermined shape.
  • the thickness of each of the plurality of electromagnetic steel plates is, for example, 0.1 mm to 0.7 mm.
  • the stator core 21 has a yoke 21a and a plurality of teeth 21b.
  • the yoke 21a is formed in an annular shape.
  • Each tooth 21b extends in the radial direction from the yoke 21a. In other words, each tooth 21 b protrudes from the yoke 21 a toward the rotation center of the rotor 3.
  • Teeth 21b are arranged at equal intervals in the circumferential direction.
  • a space formed between the teeth 21b adjacent to each other in the circumferential direction is a slot.
  • the number of teeth 21b is, for example, thirty. However, the number of teeth 21b is not limited to 30.
  • the tip of the tooth 21b extends in the circumferential direction.
  • the coil 22 is wound around the stator core 21. Specifically, the coil 22 is wound around the teeth 21b. In the example shown in FIG. 1, the coil 22 is wound around the stator core 21 by distributed winding. However, the winding of the coil 22 is not limited to distributed winding. For example, the coil 22 may be wound around the stator core 21 by concentrated winding.
  • the coil 22 has a plurality of bundles 220. Each bundle 220 is also called a coil bundle. In the example shown in FIG. 1, each bundle 220 is wound around the stator core 21 by distributed winding.
  • the coil 22 has a coil end portion 22 a located outside the stator core 21. Specifically, each bundle 220 has a coil end portion 22a.
  • the coil end portion 22a is located outside the stator core 21 in the axial direction. In other words, the coil end portion 22a is a portion of the coil 22 that is located outside the stator core 21 in the axial direction. That is, the coil end portion 22a is a portion of the coil 22 shown in FIG.
  • the number of bundles 220 and the number of coil end portions 22a are not limited to the example shown in FIG.
  • FIG. 2 is a diagram illustrating a connection state between the first winding 221 and the second winding 222 of the coil 22.
  • the coil 22 has at least one first winding 221 and at least one second winding 222.
  • the second winding 222 is connected in series with the first winding 221. That is, each bundle 220 is formed by at least one first winding 221 and at least one second winding 222.
  • the coil 22 is a three-phase coil having a U phase, a V phase, and a W phase
  • the connection of the coil 22 is a Y connection.
  • the first winding 221 is made of a material different from that of the second winding 222.
  • the second winding 222 is made of a material different from that of the first winding 221. That is, the first winding 221 and the second winding 222 are made of different materials.
  • the electrical resistivity of the second winding 222 is lower than that of the first winding 221. That is, the thermal conductivity of the second winding 222 is higher than that of the first winding 221.
  • the heat loss amount of the first winding 221 is larger than that of the second winding 222.
  • the first winding 221 is an aluminum wire
  • the second winding 222 is a copper wire
  • the first winding 221 is not limited to an aluminum wire
  • the second winding 222 is not limited to a copper wire.
  • FIG. 3 is a cross-sectional view of the bundle 220 of coils 22 (specifically, the coil end portion 22a of the bundle 220) along the line C3-C3 shown in FIG.
  • An arrow L1 indicates a heat dissipation path from the first side of the coil end portion 22a.
  • An arrow L2 indicates a heat dissipation path from the second side of the coil end portion 22a. The heat of the coil end portion 22a is released toward the heat dissipation paths L1 and L2, particularly toward the heat dissipation path L1.
  • the straight line P1 is a straight line that bisects the maximum height of the coil end portion 22a from the contact point between the coil 22 and the stator core 21 in the coil end portion 22a.
  • the maximum height of the coil end portion 22a from the contact point between the coil 22 and the stator core 21 is represented by 2 ⁇ R1.
  • the maximum height of the coil end portion 22a is the maximum height in the axial direction.
  • the first side of the coil end portion 22a is the opposite side of the stator core 21 across the straight line P1. Specifically, the first side of the coil end portion 22a is a first region 201 on the + z side from the straight line P1.
  • the second side of the coil end portion 22a is opposite to the first side of the coil end portion 22a across the straight line P1. Specifically, the second side of the coil end portion 22a is a second region 202 on the ⁇ z side from the straight line P1. That is, the cross section of the coil end portion 22a has the first region 201 and the second region 202 in the yz plane.
  • the first region 201 has, on the yz plane, an outer edge formed by a tangent to each winding (that is, the first winding 221 or the second winding 222) arranged at the outer end portion on the first side of the bundle 220. This is an area surrounded by a straight line P1.
  • the second region 202 has, in the yz plane, an outer edge formed by a tangent to each winding (that is, the first winding 221 or the second winding 222) disposed at the outer end portion on the second side of the bundle 220. This is an area surrounded by a straight line P1.
  • At least one first winding 221 and at least one second winding 222 are arranged in the first region 201, and at least one first winding is also provided in the second region 202. 221 and at least one second winding 222 are arranged.
  • first winding 221 may be disposed in the first region 201.
  • second winding 222 does not exist in the first region 201.
  • the stator 2 satisfies (A 1 / S 1 )> (A 2 / S 2 ).
  • a 1 / S 1 is a ratio of at least one first winding 221 (specifically, a total sectional area A 1 of at least one first winding 221) in the total sectional area S 1 .
  • a 2 / S 2 is a ratio of at least one first winding 221 (specifically, a total cross-sectional area A 2 of at least one first winding 221) in the total cross-sectional area S 2 .
  • the total cross-sectional area C 1 is the sum of the cross-sectional areas of the second windings 222 arranged in the first region 201
  • the total cross-sectional area C 2 is each second arranged in the second region 202. This is the sum of the cross-sectional areas of the winding 222.
  • the stator 2 satisfies (A 1 / S 1 )> (C 1 / S 1 ). Thereby, the heat dissipation efficiency in the stator 2 can be further improved.
  • stator 2 it is desirable for the stator 2 to satisfy (A 1 / C 1 )> (A 2 / C 2 ). Thereby, the heat dissipation efficiency in the stator 2 can be further improved.
  • FIG. 4 is a cross-sectional view of the bundle 220 of coils 22 (specifically, the coil end portion 22a of the bundle 220) along line C3-C3 shown in FIG.
  • the straight line P2 is a straight line that bisects the straight line P1 on the cross section of the coil end portion 22a. Therefore, the length of the straight line P1 on the cross section of the coil end portion 22a is represented by 2 ⁇ R2.
  • the radius r is a radius centered at the intersection of the straight line P1 and the straight line P2 on the cross section of the coil end portion 22a. The radius r is shorter than half the length of the straight line P1 (ie, R2) and half the length of the straight line P2 (ie, R1) on the cross section of the coil end portion 22a.
  • the region surrounded by the radius r is a circle with a radius r centering on the intersection of the straight line P1 and the straight line P2 in the yz plane.
  • the total cross-sectional area SO 1 is the area of the total cross-sectional area S 1 obtained by removing a half circle with a radius r.
  • the total cross-sectional area Si 1 is an area of a region surrounded by the radius r in the first region 201 in the yz plane. In other words, the total cross-sectional area Si 1 is the area of a semicircle having a radius r in the first region 201.
  • the total cross-sectional area of the first winding 221 is disposed outside the region surrounded by the radius r of the first region 201 and AO 1.
  • the total cross-sectional area AO 1 is the sum of the cross-sectional areas of the first windings 221 disposed outside the area surrounded by the radius r in the first area 201.
  • Ai 1 be the total cross-sectional area of at least one first winding 221 disposed in the region surrounded by the radius r in the first region 201.
  • the total cross-sectional area Ai 1 is the sum of the cross-sectional areas of the first windings 221 arranged in a region surrounded by a semicircle having a radius r in the first region 201.
  • the stator 2 satisfies (AO 1 / SO 1 )> (Ai 1 / Si 1 ).
  • AO 1 / SO 1 is a ratio of the at least one first winding 221 (specifically, the total cross-sectional area AO 1 of at least one first winding 221) in the total cross-sectional area SO 1 .
  • Ai 1 / Si 1 is the ratio of at least one first winding 221 (specifically, the total sectional area Ai 1 of at least one first winding 221) occupying in the total sectional area Si 1 .
  • the electric resistance of the first winding 221 is R Al [ ⁇ ], the electric resistivity is ⁇ Al [ ⁇ ⁇ m], and the diameter is ⁇ Al [mm].
  • the electrical resistance of the coil is obtained by multiplying the electrical resistivity ⁇ by the coil length L and dividing by the coil cross-sectional area S (ie, ⁇ ⁇ L / S). That is, in general, when the lengths L of the coils are equal, the electrical resistance of the coil is higher as the electrical resistivity is higher, and lower as the cross-sectional area is larger.
  • the cross-sectional area of one first winding 221 is S Al and the cross-sectional area of one second winding 222 is S Cu .
  • the loss [W] that is, the product of the square of the current and the electric resistance is represented by ⁇ Al ⁇ (L / S Al ), and the loss [W] generated in the second winding 222 is ⁇ Cu ⁇ (L / S Cu )).
  • the diameter ⁇ Al [mm] of the first winding 221 when the loss generated in the first winding 221 is equal to the loss generated in the second winding 222 is It becomes ⁇ ( ⁇ Al / ⁇ Cu ) times the diameter ⁇ Cu [mm] of the second winding 222.
  • the diameter ⁇ Al of the first winding 221 is set to ⁇ ( ⁇ of the diameter ⁇ Cu of the second winding 222 Al / ⁇ Cu ) times or less.
  • the diameter phi Al of the first winding 221 may be below ⁇ ( ⁇ Al / ⁇ Cu) ⁇ ⁇ Cu.
  • the electrical resistance of the first winding 221 is less than or equal to the electrical resistance of the second winding 222, and therefore the first winding
  • the loss caused by the line 221 is greater than or equal to the loss caused by the second winding 222. That is, a high loss (that is, heat generation) occurs in the first winding 221 collected in the first region 201, and the heat is released from the first region 201 to the heat dissipation path L1, so that a particularly high heat dissipation effect is obtained.
  • the electrical resistivity ⁇ Al of the first winding 221 is 2.82 ⁇ 10 ⁇ 8 [ ⁇ ⁇ m]
  • the electrical resistivity ⁇ Cu of the second winding 222 is 1.68 ⁇ 10 ⁇ 8 [ ⁇ ⁇ m].
  • the upper limit of the diameter ⁇ Al [mm] of the first winding 221 is 1.296 times the diameter ⁇ Cu [mm] of the second winding 222. If the diameter phi Al of the first winding 221 is smaller than 1.296 ⁇ ⁇ Cu, particularly high heat dissipation effect can be obtained.
  • the lower limit of the diameter ⁇ Al of the first winding 221 is made equal to the diameter ⁇ Cu of the second winding 222. Since the mechanical strength per unit cross-sectional area of the first winding 221 is lower than that of the second winding 222, in order to ensure sufficient strength of the first winding 221 in the winding process, the first winding 221 is used. it is because the desirable diameter phi Al is the diameter phi Cu or of the second winding 222 (ie ⁇ Cu ⁇ ⁇ Al).
  • the first region High loss is generated in the first winding 221 collected in 201, and the heat can be efficiently released from the first region 201 to the heat dissipation path L1. Furthermore, sufficient strength of the first winding 221 in the winding process can be ensured.
  • the current flowing through the first winding 221 and the second winding 222 is assumed to be 1 [A], but the current is not limited to 1 [A].
  • I [A] an arbitrary current flowing in the first winding 221 and the second winding 222
  • ⁇ Al ⁇ (L / S Al ) ⁇ I 2 ⁇ Cu ⁇ (L / S Cu ) ⁇ I 2
  • S Al ( ⁇ Al / ⁇ Cu ) ⁇ S Cu is obtained, from which the formula This is because (1) is derived.
  • the relationship between the electrical resistivity ⁇ Al and the diameter ⁇ Al of the first winding 221 and the electrical resistivity ⁇ Cu and the diameter ⁇ Cu of the second winding 222 is limited to the above formula (1). Instead, the following expression (2) may be satisfied.
  • the upper limit of the diameter ⁇ Al of the first winding 221 in Equation (2) is the same as that in Equation (1). The reason is as described above.
  • the lower limit of the diameter ⁇ Al of the first winding 221 in Expression (2) is 0.5 ⁇ ⁇ Cu , that is, 1 ⁇ 2 of the diameter ⁇ Cu of the second winding 222.
  • the first winding 221 When the diameter ⁇ Al of the first winding 221 is smaller than 1 ⁇ 2 of the diameter ⁇ Cu of the second winding 222, the first winding 221 may be inserted into the winding nozzle in two rows, The first winding 221 may be damaged. Further, since the winding machine applies the same tension when the first winding 221 is wound and when the second winding 222 is wound, there is a possibility of disconnection if the first winding 221 is too thin. .
  • the diameter ⁇ Al [mm] of the first winding 221 is 0.5 ⁇ ⁇ Cu [mm] or more. Accordingly, a high loss is generated in the first winding 221 collected in the first region 201, and the heat is effectively released from the first region 201 to the heat dissipation path L1, and the first winding in the winding process is performed. Damage and disconnection of the wire 221 can be prevented.
  • the first winding 221 and the second winding 222 are connected in series with each other, and the loss generated in the first winding 221 having a high electrical resistivity is higher than the loss generated in the second winding 222. Therefore, it is desirable that the high-loss first windings 221 are densely arranged in the first region 201 of the coil end portion 22a. Thus, the heat of the first winding 221 can be efficiently released to the heat dissipation path L1.
  • the loss density [W / mm 2 ] is a value obtained by dividing the loss generated in the coil by the cross-sectional area per one coil.
  • the loss [W] generated in the first winding 221 is R Al
  • the loss [W] generated in the second winding 222 is R Cu .
  • the loss density [W / m 2 ] of the first winding 221 is R Al / S Al and is expressed as R Al / (k ⁇ S Cu ) when the cross-sectional area ratio k is used.
  • the loss density [W / m 2 ] of the second winding 222 is R Cu / S Cu .
  • the ratio of the loss density of the first winding 221 to the loss density of the second winding 222 is defined as the loss density ratio. Since the loss density ratio is ⁇ R Al / (k ⁇ S Cu ) ⁇ / ⁇ R Cu / S Cu ⁇ , it is expressed as R Al / (k ⁇ R Cu ).
  • FIG. 5 shows a cross section [mm 2 ], a cross section ratio, an electric resistance [ ⁇ / km], a current [A], a loss [W], and a loss density [W] for the first winding 221 and the second winding 222. / Mm 2 ] and loss density ratio.
  • the loss density ratio is 1 or more, that is, when the loss density of the first winding 221 is equal to or higher than the loss density of the second winding 222, the first winding 221 disposed in the first region 201 is high. Loss is generated, and the heat can be efficiently released from the first region 201 to the heat dissipation path L1. Therefore, it is desirable that 1 ⁇ R Al / (k ⁇ R Cu ).
  • the first winding 221 is used to ensure sufficient strength in the winding process using a common winding machine. It is desirable that the diameter phi Al line 221 is greater than or equal to the diameter phi Cu of the second winding 222. Therefore, it is desirable that 1 ⁇ k.
  • a high loss is generated in the first winding 221 collected in the first region 201, and the heat is efficiently released from the first region 201 to the heat radiation path L1, and in the winding process. Sufficient strength of the first winding 221 can be ensured.
  • the upper limit of the loss density ratio R Al / (k ⁇ R Cu ) is R Al / R Cu in which 1 is substituted for k.
  • the diameter ⁇ Cu of the second winding 222 is 0.9 [mm]
  • the electric resistance R Cu is 27.1 [ ⁇ ]
  • the diameter ⁇ Al of the first winding 221 is 0.9 [mm].
  • FIG. 6 shows the difference between the cross-sectional area ratio k and the loss density ratio when the diameter ⁇ Cu of the second winding 222 is set to 0.9 [mm] and the diameter ⁇ Al of the first winding 221 is changed. It is a graph which shows a relationship. As shown in FIG. 6, the desirable range of the loss density ratio R Al / (k ⁇ R Cu ) when the diameter ⁇ Cu of the second winding 222 is 0.9 [mm] is 1 ⁇ R Al / ( k ⁇ R Cu ) ⁇ 1.679.
  • the first winding 221 and the second winding 222 are wound by a common winding machine, it is necessary to match the nozzle diameter of the winding nozzle of the winding machine with the thicker winding. If the diameter phi Al of the first winding 221 is less than half the diameter phi Cu of the second winding 222, there is a possibility that the first winding 221 is inserted in two rows in the winding nozzle damaged . Further, since the winding machine applies the same tension when the first winding 221 is wound and when the second winding 222 is wound, there is a possibility of disconnection if the first winding 221 is too thin. .
  • the lower limit of the diameter ⁇ Al [mm] of the first winding 221 is 0.5 ⁇ ⁇ Cu [mm].
  • this is expressed by a cross-sectional area ratio k, 0.25 ⁇ k.
  • a high loss is generated in the first winding 221 collected in the first region 201 of the coil end portion 22a, and the heat can be efficiently released from the first region 201 to the heat dissipation path L1, and Sufficient damage and disconnection of the first winding 221 in the winding process can be prevented.
  • the upper limit of the loss density ratio R Al / (k ⁇ R Cu ) is R Al /(0.25 ⁇ R Cu ) in which 0.25 is substituted for k.
  • the diameter ⁇ Cu of the second winding 222 is 0.9 [mm]
  • the electric resistance R Cu is 27.1 [ ⁇ ]
  • the diameter ⁇ Al of the first winding 221 is 0.45 [mm].
  • a desirable range of the loss density ratio R Al / (k ⁇ R Cu ) is expressed as 1 ⁇ R Al / (k ⁇ R Cu ) ⁇ 25.815.
  • the electric motor 1 described in the first embodiment is, for example, an induction motor.
  • induction motors are often driven without using an inverter.
  • the control unit that controls the electric motor 1 often drives the electric motor 1 by supplying a constant voltage to the coil 22. Therefore, the current flowing through the coil 22 may increase significantly due to fluctuations in the load or supply voltage of the electric motor 1, and the temperature of the coil 22 may increase.
  • the electric motor 1 having the stator 2 according to the first embodiment has a high heat dissipation effect and can reduce the temperature rise of the coil 22 as described above, the induction motor having a large current fluctuation is particularly effective. Demonstrate.
  • the electric motor 1 is an electric motor other than the induction motor, for example, a synchronous electric motor, a high heat dissipation effect can be obtained.
  • the heat of the stator 2 (for example, the heat of the stator core 21 and the heat of the coil 22). ) Is not easily transmitted from the second side to the first side.
  • the heat of the stator 2 since the heat of the stator 2 is not easily released to the outside of the stator 2, it is difficult to reduce the temperature rise of the stator 2. Therefore, it is desirable to release the heat of the stator 2 to the heat dissipation path L1 rather than the heat dissipation path L2.
  • a medium such as a liquid (for example, a refrigerant) exists around the coil 22
  • the heat of the coil 22 is easily released to the medium.
  • the heat of the coil 22 is more easily released to the heat dissipation path L1 than the heat dissipation path L2. Therefore, it is desirable to form the coil 22 so that heat is easily released to the heat dissipation path L1.
  • the second winding 222 is connected in series with the first winding 221, and the first winding 221 having a large amount of heat loss is connected from the second side of the coil end portion 22a.
  • the second winding 222 having a small amount of heat loss is arranged more on the second side than the first side of the coil end portion 22a.
  • the stator 2 satisfies (A 1 / S 1 )> (A 2 / S 2 ). That is, the density of the first winding 221 in the first side of the coil end portion 22 a, that is, the first region 201 is the density of the first winding 221 in the second side of the coil end portion 22 a, that is, the second region 202. Bigger than.
  • the first windings 221 having a large heat loss amount are densely arranged on the first side of the coil end portion 22a.
  • the heat of the stator 2, particularly the heat of the coil 22 is efficiently transmitted from the second side of the coil end portion 22 a to the first side and released from the first side to the heat dissipation path L 1.
  • the heat dissipation efficiency in the coil end part 22a can be improved, and the temperature rise in the stator 2 (particularly, the coil 22) when the electric motor 1 rotates at high speed can be reduced. As a result, the output of the electric motor 1 having the stator 2 can be increased.
  • stator 2 it is desirable for the stator 2 to satisfy (A 1 / S 1 )> (C 1 / S 1 ). Thereby, since the heat of the coil 22 is efficiently released from the first side to the heat dissipation path L1, the heat dissipation efficiency in the stator 2 can be further improved, and the temperature rise in the stator 2 can be reduced. .
  • stator 2 it is desirable for the stator 2 to satisfy (A 1 / C 1 )> (A 2 / C 2 ).
  • the heat of the stator 2, particularly the heat of the coil 22 is efficiently transmitted from the second side of the coil end portion 22a to the first side, and the heat is easily released from the first side to the heat dissipation path L1. Can do.
  • the heat dissipation efficiency in the stator 2 can be further improved, and the temperature rise in the stator 2 can be reduced.
  • Only at least one first winding 221 may be arranged on the first side of the coil end portion 22a.
  • the second winding 222 does not exist on the first side of the coil end portion 22a.
  • only the first winding 221 having a large heat loss amount is arranged on the first side of the coil end portion 22a, that is, the first region 201, so that the heat of the coil 22 is transferred from the first side to the heat dissipation path L1. It can be released easily.
  • the heat dissipation efficiency in the stator 2 can be further improved, and the temperature rise in the stator 2 can be reduced.
  • the stator 2 desirably satisfies (AO 1 / SO 1 )> (Ai 1 / Si 1 ).
  • AO 1 / SO 1 AO 1 / SO 1
  • Si 1 / Si 1 a large number of first windings 221 having a large heat loss amount can be arranged in a region exposed to the outside of the coil 22. That is, in the first region 201, many first windings 221 can be arranged outside the region surrounded by the radius r.
  • the heat dissipation efficiency in the stator 2 can be further improved, and the temperature rise in the stator 2 can be reduced.
  • the current values flowing in the first winding 221 and the second winding 222 are equal to each other. Since the electric resistance R Al of the first winding 221 is larger than the electric resistance R Cu of the second winding 222, the amount of heat loss generated in the first winding 221 is greater than the amount of heat loss generated in the second winding 222. Is also big. Therefore, as described above, by disposing most of the first windings 221 in the first region 201, the heat dissipation efficiency in the coil end portion 22a can be improved.
  • the electrical resistivity ⁇ Al [ ⁇ ⁇ m] and the diameter ⁇ Al [mm] of the first winding 221 and the electrical resistivity ⁇ Cu [ ⁇ ⁇ m] and the diameter ⁇ Cu [mm] of the second winding 222 are Satisfying the above formula (1). Accordingly, high loss (that is, heat generation) occurs in the first winding 221 collected in the first region 201, and the heat is released from the first region 201 to the heat dissipation path L1, thereby further enhancing the heat dissipation effect. it can. Further, since the diameter ⁇ Al of the first winding 221 is equal to or larger than the diameter ⁇ Cu of the second winding 222, sufficient strength of the first winding 221 in the winding process can be ensured.
  • the electrical resistivity ⁇ Al [ ⁇ ⁇ m] and the diameter ⁇ Al [mm] of the first winding 221, and the electrical resistivity ⁇ Cu [ ⁇ ⁇ m] and the diameter ⁇ Cu [mm] of the second winding 222 Satisfies the above equation (2). Thereby, the heat dissipation effect can be further enhanced. Further, when the diameter ⁇ Al of the first winding 221 is equal to or greater than 1 ⁇ 2 of the diameter ⁇ Cu of the second winding 222, damage and disconnection of the first winding 221 in the winding process can be prevented. .
  • the ratio of the electrical resistance R Al of the first winding 221, the electrical resistance R Cu of the second winding 222, and the cross-sectional area S Al of the first winding 221 to the cross-sectional area S Cu of the second winding 222 A certain cross-sectional area ratio k satisfies the above equation (3). That is, the loss density of the first winding 221 is equal to or higher than the loss density of the second winding 222. Therefore, most of the first windings 221 having a large loss density are arranged in the first region 201. As a result, a high loss occurs in the first winding 221, so that heat can be efficiently released from the first region 201 to the heat dissipation path L1, and the heat dissipation effect can be further enhanced.
  • the cross-sectional area ratio k is 1 or more, sufficient strength of the first winding 221 can be ensured in the winding process using a common winding machine. Moreover, if the cross-sectional area ratio k is 0.25 or more, it is possible to prevent the first winding 221 from being damaged and disconnected in a winding process using a common winding machine.
  • the electric motor 1 having the stator 2 according to the first embodiment has the effect of the stator 2 described above. Furthermore, a particularly high effect can be obtained by applying the electric motor 1 having the stator 2 according to the first embodiment to an induction motor.
  • FIG. ⁇ Scroll compressor> Next, a scroll compressor 300 as a compressor to which the electric motor 1 described in the first embodiment is applied will be described.
  • FIG. 7 is a cross-sectional view showing the scroll compressor 300.
  • the scroll compressor 300 includes an airtight container 307, a compression mechanism 305 disposed in the airtight container 307, an electric motor 1 that drives the compression mechanism 305, a shaft 306 that connects the compression mechanism 305 and the electric motor 1, and a shaft 306 And a sub-frame 308 that supports a lower end portion (that is, an end portion opposite to the compression mechanism 305 side).
  • the compression mechanism 305 includes a fixed scroll 301 having a spiral part, a swinging scroll 302 having a spiral part that forms a compression chamber between the spiral part of the fixed scroll 301, and a compliance frame 303 that holds the upper end of the shaft 306. And a guide frame 304 that is fixed to the hermetic container 307 and holds the compliance frame 303.
  • a suction pipe 310 penetrating the sealed container 307 is press-fitted. Further, the sealed container 307 is provided with a discharge pipe 311 for discharging high-pressure refrigerant gas discharged from the fixed scroll 301 to the outside.
  • the discharge pipe 311 communicates with an opening (not shown) provided between the compression mechanism 305 of the sealed container 307 and the electric motor 1.
  • the electric motor 1 is fixed to the sealed container 307 by fitting the stator 2 into the sealed 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 sealed container 307 by welding.
  • the scroll compressor 300 includes the electric motor 1 described in the first embodiment, the scroll compressor 300 has the effects described in the first embodiment. Furthermore, since the electric motor 1 having the stator 2 according to the first embodiment has a high heat dissipation effect, the temperature rise inside the scroll compressor 300 can be reduced. Furthermore, since the output of the electric motor 1 can be increased as described in the first embodiment, the output of the scroll compressor 300 can also be increased.
  • the electric motor 1 described in the first embodiment may be applied to a compressor other than the scroll compressor 300.
  • FIG. 8 is a diagram illustrating an air conditioner 400 (also referred to as a refrigeration cycle apparatus).
  • the air conditioner 400 includes a compressor 401, a condenser 402, a throttling device (also referred to as a decompression device) 403, and an evaporator 404.
  • the compressor 401, the condenser 402, the expansion device 403, and the evaporator 404 are connected by a refrigerant pipe 407 to constitute a refrigeration cycle. That is, the refrigerant circulates in the order of the compressor 401, the condenser 402, the expansion device 403, and the evaporator 404.
  • the compressor 401, the condenser 402, and the expansion device 403 are provided in the outdoor unit 410.
  • the compressor 401 is the scroll compressor 300 described in the second embodiment.
  • the compressor 401 may be a compressor other than the scroll compressor as long as it has the electric motor 1 having the stator 2 described in the first embodiment.
  • the outdoor unit 410 is provided with an outdoor fan 405 that supplies outdoor air to the condenser 402.
  • the evaporator 404 is provided in the indoor unit 420.
  • the indoor unit 420 is provided with an indoor blower 406 that supplies indoor air to the evaporator 404.
  • the compressor 401 compresses and sends out the sucked refrigerant.
  • the condenser 402 exchanges heat between the refrigerant flowing in from the compressor 401 and the outdoor air, condenses and liquefies the refrigerant, and sends it out to the refrigerant pipe 407.
  • the outdoor blower 405 supplies outdoor air to the condenser 402.
  • the expansion device 403 adjusts the pressure and the like of the refrigerant flowing through the refrigerant pipe 407 by changing the opening degree.
  • the evaporator 404 exchanges heat between the refrigerant whose pressure is reduced by the expansion device 403 and indoor air, causes the refrigerant to take heat of the air and vaporizes it, and sends it to the refrigerant pipe 407.
  • the indoor fan 406 supplies indoor air to the evaporator 404. Thereby, the cold air from which heat has been removed by the evaporator 404 is supplied to the room.
  • the air-conditioning apparatus 400 Since the air conditioner 400 includes the electric motor 1 described in the first embodiment, the air-conditioning apparatus 400 has the effects described in the first embodiment. Further, since the air conditioner 400 uses the scroll compressor 300 described in the second embodiment as the compressor 401, the air-conditioning apparatus 400 has the effects described in the second embodiment. As described above, since the electric motor 1 described in the first embodiment has a high heat dissipation effect, the temperature rise in the compressor 401 can be reduced, and the air conditioner 400 can be stably operated. Moreover, the output of the air conditioner 400 can also be increased by the increase in the output of the compressor 401 accompanying the increase in the output of the electric motor 1.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Windings For Motors And Generators (AREA)

Abstract

Un stator (2) selon la présente invention comprend un noyau de stator (21) et une bobine (22) qui est enroulée autour du noyau de stator (21). La bobine (22) comprend au moins un premier fil d'enroulement (221) et au moins un second fil d'enroulement (222) qui est connecté en série avec le premier fil d'enroulement (221). Si S1 est la section transversale totale d'une partie d'extrémité de bobine (22a) de la bobine (22) sur le premier côté, si S2 est la section transversale totale de la partie d'extrémité de bobine (22a) sur le second côté, si A1 est la section transversale totale des premiers fils d'enroulement (221) sur le premier côté, et si A2 est la section transversale totale des premiers fils d'enroulement (221) sur le second côté, S1, S2, A1 et A2 satisfont l'expression de relation (A1/S1) > (A2/S2).
PCT/JP2018/019235 2018-05-18 2018-05-18 Stator, moteur, compresseur et dispositif de climatisation WO2019220610A1 (fr)

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JP2020518912A JP7046170B2 (ja) 2018-05-18 2018-05-18 固定子、電動機、圧縮機、及び空気調和装置
PCT/JP2018/019235 WO2019220610A1 (fr) 2018-05-18 2018-05-18 Stator, moteur, compresseur et dispositif de climatisation

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JP2010183788A (ja) * 2009-02-09 2010-08-19 Jtekt Corp 電動モータ
JP2012139087A (ja) * 2010-12-09 2012-07-19 Panasonic Corp 密閉型電動圧縮機
WO2014188466A1 (fr) * 2013-05-20 2014-11-27 三菱電機株式会社 Stator et moteur électrique le mettant en œuvre
US20150010412A1 (en) * 2013-07-02 2015-01-08 Danfoss Tianjin Ltd. Stator, motor and compressor
WO2015111369A1 (fr) * 2014-01-22 2015-07-30 パナソニックＩｐマネジメント株式会社 Moteur triphasé
WO2015166726A1 (fr) * 2014-04-30 2015-11-05 三菱電機株式会社 Moteur électrique, compresseur hermétique et dispositif à cycle frigorifique

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JPH10174330A (ja) * 1996-12-17 1998-06-26 Toshiba Corp 三相電機子巻線
WO2019163021A1 (fr) 2018-02-21 2019-08-29 三菱電機株式会社 Stator, moteur électrique, compresseur et dispositif de climatisation

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010183788A (ja) * 2009-02-09 2010-08-19 Jtekt Corp 電動モータ
JP2012139087A (ja) * 2010-12-09 2012-07-19 Panasonic Corp 密閉型電動圧縮機
WO2014188466A1 (fr) * 2013-05-20 2014-11-27 三菱電機株式会社 Stator et moteur électrique le mettant en œuvre
US20150010412A1 (en) * 2013-07-02 2015-01-08 Danfoss Tianjin Ltd. Stator, motor and compressor
WO2015111369A1 (fr) * 2014-01-22 2015-07-30 パナソニックＩｐマネジメント株式会社 Moteur triphasé
WO2015166726A1 (fr) * 2014-04-30 2015-11-05 三菱電機株式会社 Moteur électrique, compresseur hermétique et dispositif à cycle frigorifique

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