Stator, motor and compressor

Abstract

The stator comprises: a stator core (10) having a plurality of teeth (12); an insulator (20); a plurality of coils (U1); a first region (S1) in which the ends of the power supply lines are connected to each other; and a second region (S2) in which the ends of the neutral lines are connected to each other. The insulator (20) comprises an inner wall (20a) and an outer wall (20b) which are arranged at intervals in the radial direction of the stator core (10). The center of gravity (O2) of the second region (S2) is located between the center of gravity (O1) of the first region (S1) and the stator core (10), and when the radial length of the first region (S1) is set to B, the radial length of the second region (S2) is set to C, and the radial length between the inner wall (20a) and the outer wall (20b) of the insulator (20) is set to A, the following relationship is satisfied: B<A and C<A……(Formula 1).

Description

Technical Field

[0001] The present disclosure relates to a stator, a motor and a compressor. Background Art

[0002] Conventionally, there is a stator in which a neutral wire and a lead wire are fixed to an upper insulator in an undifferentiated state (for example, refer to Japanese Patent No. 3824001 (Patent Document 1)).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 3824001 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In the above-mentioned stator, when used for a motor arranged in a closed container of a compressor, the gap between the coils cannot be fully ensured due to the neutral wire and the lead wire, so there are the following problems: the cross-sectional area of ​​the passage between the coils for the refrigerant to flow is insufficient, the flow rate of the refrigerant flowing between the coils becomes faster, and oil overflow (oil overflow) is likely to occur, and the outflow of oil cannot be suppressed.

[0008] In the present disclosure, a stator capable of suppressing oil from flowing out from gaps between coils in the case of a motor used for a compressor is proposed.

[0009] Furthermore, the present disclosure provides a motor including the above-mentioned stator.

[0010] Furthermore, the present disclosure provides a compressor including the above-mentioned motor.

[0011] Means for solving problems

[0012] The stator of the present disclosure is characterized in that it comprises: a stator core having a plurality of teeth; an insulator mounted on an axial end surface of the stator core; a plurality of coils respectively wound around the plurality of teeth of the stator core; a first region in which terminal portions of power supply wires extending from one end of the plurality of coils are connected to each other; and a second region in which terminal portions of neutral wires extending from the other end of the plurality of coils are connected to each other, the insulator having an inner wall and an outer wall spaced apart in a radial direction of the stator core, the center of gravity of the second region being located between the center of gravity of the first region and the stator core in a cross section of a gap between at least one pair of coils among the plurality of coils along a plane including the axis of the stator core, and when the radial length of the first region is set to B, the radial length of the second region is set to C, and the radial length between the inner wall and the outer wall of the insulator is set to A, the following relationship is satisfied:

[0013] B<A and C<A……(Formula 1).

[0014] According to the present disclosure, by satisfying the condition that the center of gravity of the second region is between the center of gravity of the first region and the stator core and the condition of the above-mentioned formula 1, the cross-sectional area of ​​the passage between at least one pair of coils for the flow of refrigerant in the case of a motor for a compressor can be ensured, the flow rate of the refrigerant flowing between the coils can be slowed down, and oil outflow from the gaps between the coils can be suppressed.

[0015] In addition, in a stator of one embodiment of the present disclosure, in a cross section of all gaps between the coils along a plane including the axis of the stator core, the center of gravity of the second region is located between the center of gravity of the first region and the stator core, and satisfies the relationship of Formula 1.

[0016] According to the present disclosure, when used in a motor for a compressor, the passage cross-sectional area between all coils through which the refrigerant flows can be ensured, the flow rate of the refrigerant flowing between all coils can be slowed down, and oil outflow from the gaps between the coils can be effectively suppressed.

[0017] In the stator according to one aspect of the present disclosure, in a cross section along a plane including an axis of the stator core over the entire circumference of the stator core, the center of gravity of the second region is located between the center of gravity of the first region and the stator core.

[0018] According to the present disclosure, since the second region with a relatively small cross-sectional shape is overall arranged closer to the stator core side than the first region, the space close to the coil end side is expanded, which can make the passage cross-sectional area between the coils wider, and make the flow of refrigerant smoother, and the flow rate of the refrigerant flowing between the coils can be slowed down.

[0019] In the stator according to one aspect of the present disclosure, an end portion of the second region on the opposite side to the stator core is located between an end portion of the first region on the stator core side and the stator core.

[0020] According to the present disclosure, since the second area with a relatively small cross-sectional shape is arranged closer to the stator core side than the first area, the space close to the coil end is expanded, which can make the passage cross-sectional area between the coils wider and the flow of the refrigerant smoother, and can slow down the flow rate of the refrigerant flowing between the coils.

[0021] In a stator according to one embodiment of the present disclosure, the first region has a plurality of first regions, and in a cross section of the gaps between all the coils along a plane including the axis of the stator core, when the length from the innermost end to the outermost end of the plurality of first regions in the radial direction is La and the length from the innermost end to the outermost end of one or more of the second regions in the radial direction is Lb, the following relationship is satisfied:

[0022] La>Lb……(Formula 2).

[0023] According to the present disclosure, by satisfying the relationship of the above-mentioned Expression 2, it is possible to ensure a passage cross-sectional area between coils through which the refrigerant flows when the motor is used for a compressor.

[0024] Furthermore, the motor of the present disclosure is characterized by comprising any one of the above-mentioned stators and a rotor arranged radially inside the above-mentioned stator.

[0025] According to the present disclosure, a motor with high reliability can be realized.

[0026] In addition, the compressor of the present disclosure is characterized in that it includes: a sealed container; a compression mechanism disposed in the sealed container; and the motor disposed in the sealed container to drive the compression mechanism.

[0027] According to the present disclosure, a compressor including a motor with high reliability can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a perspective view of the stator according to the first embodiment of the present disclosure.

[0029] Figure 2 1 is a longitudinal sectional view of the stator.

[0030] Figure 3 It is a diagram showing the connection state of the coils of the above-mentioned stator.

[0031] Figure 4 It is simplified Figure 3 The diagram shows the wiring status of the coil.

[0032] Figure 5 is a top view of the stator.

[0033] Figure 6 It is a schematic cross-sectional view of the main parts of the above-mentioned stator.

[0034] Figure 7 It is a schematic cross-sectional view of the main parts of the above-mentioned stator.

[0035] Figure 8 It is a schematic cross-sectional view of a main part of a stator according to a second embodiment of the present disclosure.

[0036] Fig. 9 It is a cross-sectional view of a compressor including a motor according to a third embodiment of the present disclosure. DETAILED DESCRIPTION

[0037] The following is a description of the embodiments. In addition, in the drawings, the same reference numerals represent the same parts or equivalent parts. In addition, the dimensions on the drawings such as length, width, thickness, depth, etc. are appropriately changed from the actual scale for the clarity and simplification of the drawings, and do not represent the actual relative dimensions.

[0038] (First Embodiment)

[0039] Figure 1 is a perspective view of a stator 1 according to a first embodiment of the present disclosure. Figure 2 1 is a longitudinal sectional view of the stator.

[0040] like Figure 1 , Figure 2 As shown, the stator 1 comprises: a stator core 10; an upper insulator 20 mounted on the axial upper end surface of the stator core 10; a lower insulator 30 mounted on the axial lower end surface of the stator core 10; and coils U1 to U4, V1 to V4, and W1 to W4, which are wound together on the stator core 10, the upper insulator 20, and the lower insulator 30.

[0041] As the material of the upper insulator 20 and the lower insulator 30, a resin having insulating properties is used.

[0042] The stator core 10 also includes an annular back yoke 11 and a plurality of teeth 12 projecting radially inward from an inner peripheral surface of the back yoke 11 .

[0043] Here, the coils U1 to U4 , V1 to V4 , and W1 to W4 are so-called concentrated windings that are respectively wound around the teeth 12 and are not wound across a plurality of teeth 12 .

[0044] Figure 3 1 is a diagram showing the connection state of the coils U1 to U4, V1 to V4, and W1 to W4 of the stator 1. Figure 4 It is simplified Figure 3 The wiring state of coils U1 to U4, V1 to V4, and W1 to W4 is shown in FIG. Figure 3 , a top view of the stator core 10 is shown, but the upper insulator 20 is omitted.

[0045] Twelve power supply wires eU1 to eU4, eV1 to eV4, and eW1 to eW4, which are the winding start portions of the coils U1 to U4, V1 to V4, and W1 to W4, come out from the upper end surface of the stator core 10. Twelve neutral wires cU1 to cU4, cV1 to cV4, and cW1 to cW4, which are the winding end portions of the coils U1 to U4, V1 to V4, and W1 to W4, also come out from the upper end surface of the stator core 10.

[0046] The power supply lines eU1 and eU2 extend from one side of the windings of the coils U1 and U2, respectively, and are connected to the connection portion X of the U phase. Ua In addition, the power supply lines eU3 and eU4 extend from one side of the windings of the coils U3 and U4 and are connected to the connection part X of the U phase. Ub connect.

[0047] The power supply lines eV1 and eV2 extend from one side of the windings of the coils V1 and V2, respectively, and are connected to the connection portion X of the V phase. Va In addition, the power supply lines eV3 and eV4 extend from one side of the windings of the coils V3 and V4, respectively, and are connected to the connection part X of the V phase. Vb connect.

[0048] The power supply lines eW1 and eW2 extend from one side of the windings of the coils W1 and W2, respectively, and are connected to the connection portion X of the W phase. Wa In addition, the power supply lines eW3 and eW4 extend from one side of the windings of the coils W3 and W4 and are connected to the connection portion X of the W phase. Wb connect.

[0049] Since the coils U1 to U4 , V1 to V4 , and W1 to W4 are respectively wound and fixed, the power supply wires eU1 to eU4 , eV1 to eV4 , and eW1 to eW4 , which are the winding start portions, do not become loose even if they are not fixed to the stator core 10 .

[0050] Neutral lines cU1 to cU4 extend from the other side of the windings of coils U1 to U4 and are connected to the neutral point N. Neutral lines cV1 to cV4 extend from the other side of the windings of coils V1 to V4 and are connected to the neutral point N. Neutral lines cW1 to cW4 extend from the other side of the windings of coils W1 to W4 and are connected to the neutral point N. At the neutral point N, all neutral lines cU1 to cU4, cV1 to cV4, and cW1 to cW4 are electrically connected.

[0051] The power supply lines eU1 to eU4 , eV1 to eV4 , and eW1 to eW4 and the neutral lines cU1 to cU4 , cV1 to cV4 , and cW1 to cW4 are fixed to an upper insulator 20 attached to an upper end surface of the stator core 10 so as not to be electrically connected to each other.

[0052] Figure 5 is a top view of the stator 1. Figure 5 As shown, the connection part X of phase U will be covered Ua ( Figure 3 , Figure 4 The insulating cap 110 and the connection portion X covering the U phase Ub ( Figure 3 , Figure 4 The insulating caps 120 shown in FIG. 1 are staggered in the circumferential direction and received on the coil ends.

[0053] Similarly, insulating cap 110 covering the connection portion (not shown) of the V phase and insulating cap 120 covering the connection portion (not shown) of the V phase are housed on the coil end so as to be offset in the circumferential direction relative to insulating caps 110 , 120 of the V phase.

[0054] Similarly, insulating cap 110 covering the connection portion (not shown) of the W phase and insulating cap 120 covering the connection portion (not shown) of the W phase are housed on the coil end so as to be circumferentially offset from insulating caps 110 , 120 of the W phase.

[0055] The lead wires 111 , 121 , the insulation caps 110 , 120 , and other lead wires are fixed to the upper insulator 20 by a plurality of binding wires (not shown).

[0056] exist Figure 5 In , Y is the gap between coils U1 to U4, V1 to V4, and W1 to W4, and Z is the radial length of the opening of the upward passage forming the gap W. The cross-sectional area of ​​the passage forming the flow path (passage cross-sectional area) is approximately Y×Z.

[0057] Figure 6 , Figure 7 1 is a schematic cross-sectional view of the main parts of the stator 1. Figure 6 , Figure 7 In, with Figure 1 , Figure 2 The same components are denoted by the same reference numerals. Figure 6 , Figure 7 It is a cross section of the coil U1 among the plurality of coils U1 to U4 , V1 to V4 , and W1 to W4 , along a plane including the axis of the stator core 10 .

[0058] The stator 1 comprises: a first region S1, in which the end portions of power supply lines eU1 to eU4, eV1 to eV4, eW1 to eW4 extending from one end of a plurality of coils U1 to U4, V1 to V4, W1 to W4 are connected to each other; and a second region S2, in which the end portions of neutral lines cU1 to cU4, cV1 to cV4, cW1 to cW4 extending from the other end of a plurality of coils U1 to U4, V1 to V4, W1 to W4 are connected to each other.

[0059] The upper insulator 20 has an inner wall 20 a and an outer wall 20 b which are provided at a distance from each other in the radial direction of the stator core 10 .

[0060] exist Figure 6 In the cross section of , the center of gravity O1 of the first region S1 is located above the center of gravity O2 of the second region S2 in the axial direction of the stator core 10 (first condition). Figure 6 In the cross section of , the center of gravity O2 of the second region S2 is located between the center of gravity O1 of the first region S1 and the stator core 10 (first condition). In the first embodiment, the height difference between the center of gravity O1 of the first region S1 and the center of gravity O2 of the second region S2 is set to H. Here, the center of gravity O1 of the first region S1 and the center of gravity O2 of the second region S2 are the centers of gravity of their respective cross-sectional shapes.

[0061] In addition, Figure 7 In the cross section, when the radial length of the first region S1 is set to B, the radial length of the second region S2 is set to C, and the radial length between the inner wall 20a and the outer wall 20b of the upper insulator 20 is set to A, the following relationship (second condition) is satisfied:

[0062] B<A and C<A……(Formula 1).

[0063] By satisfying the first and second conditions in the cross-section of the gap between at least one pair of coils among the multiple coils U1 to U4, V1 to V4, and W1 to W4 along a plane containing the axis of the stator core 10, it is possible to ensure a passage cross-sectional area between the coils for the flow of refrigerant when used in the compressor 200 described later, slow down the flow rate of the refrigerant flowing between the coils, and suppress the outflow of oil from the gaps between the coils.

[0064] In the first embodiment, the first condition and the second condition are satisfied in a cross section of a gap between a pair of coils along a plane including the axis of the stator core 10, but the first condition and the second condition can be satisfied in a cross section of a gap between two or more coils along a plane including the axis of the stator core 10.

[0065] In addition, the first condition and the second condition may be satisfied in the cross section of the gaps between all coils U1 to U4, V1 to V4, and W1 to W4 along the plane containing the axis of the stator core 10. Thus, the cross-sectional area of ​​the passages between all coils U1 to U4, V1 to V4, and W1 to W4 can be ensured, the flow rate of the refrigerant flowing between all coils U1 to U4, V1 to V4, and W1 to W4 can be slowed down, and the oil can be effectively suppressed from flowing out of the gaps between the coils U1 to U4, V1 to V4, and W1 to W4.

[0066] In addition, in the cross section along the plane including the axis of the stator core 10 over the entire circumference of the stator core 10, the center of gravity O1 of the first region S1 may be located above the center of gravity O2 of the second region S2 in the axial direction of the stator core 10. In other words, in the cross section along the plane including the axis of the stator core 10 over the entire circumference of the stator core 10, the center of gravity O2 of the second region S2 may be located between the center of gravity O1 of the first region S1 and the stator core 10. Thus, the second region S2 having a relatively small cross-sectional shape is disposed on the lower side (stator core 10 side) than the first region S1 as a whole, so that the space on the side close to the coil end is expanded, the cross-sectional area of ​​the passage between the coils can be made wider, and the flow of the refrigerant can be smoothed, and the flow rate of the refrigerant flowing between the coils can be slowed down.

[0067] In addition, it is preferred that the lower end of the first region S1 is located above the upper end of the second region S2 in the axial direction of the stator core 10. In other words, it is preferred that the end of the second region S2 on the opposite side to the stator core 10 is located between the end of the first region S1 on the stator core 10 side and the stator core 10. Thus, the second region S2 having a relatively small cross-sectional shape is arranged on the lower side (stator core 10 side) than the first region S1, so that the space on the side close to the coil end is expanded, which can make the passage cross-sectional area between the coils wider and make the flow of the refrigerant smoother, and can slow down the flow rate of the refrigerant flowing between the coils.

[0068] Next, the first area S1 and the second area S2 will be described in detail.

[0069] First, if Figure 5 As shown in the top view of the stator 1, lead wires 111 and 121 are arranged above the coils U1 to U4, V1 to V4, and W1 to W4 wound around the teeth 12. The first region S1 including the lead wires and the second region S2 including the neutral wire have different shapes depending on the circumferential position of the stator 1.

[0070] For example, in a first region S1 at a certain position in the circumferential direction of the stator 1, the power supply lines eU1 and eU2 ( Figure 3 , Figure 4The terminal end of the coil U3 and the lead wire 111 are connected to each other, and the power supply wires eU3 and eU4 ( Figure 3 , Figure 4 The terminal end of the lead wire 121 is connected to each other.

[0071] In addition, at the connection portion X where the power supply lines eU1 and eU2 are connected to the lead line 111, Ua ( Figure 3 , Figure 4 As shown in FIG. 1 , the insulating cover 110 is covered by a roll-shaped insulating cover 110. In addition, at the connection portion X where the power supply lines eU3 and eU4 are connected to the lead line 121, Ub ( Figure 3 , Figure 4 As shown), it is covered by a roll-shaped insulating cap 120.

[0072] The power supply wires eU1 , eU2 , the power supply wires eU3 , eU4 , the lead wires 111 , 121 , etc. are fixed to the upper insulator 20 by a binding wire (not shown).

[0073] In the second region S2, the neutral lines cU1 and cU2 ( Figure 3 , Figure 4 The terminal portion of the coil U3 and the neutral line cU3 and cU4 (shown) extending from the other end of the U-phase coil U3 and U4 Figure 3 , Figure 4 The end portions of the plurality of components are connected to each other.

[0074] (Second embodiment)

[0075] Figure 8 1 is a schematic cross-sectional view of a main part of the stator 1 according to the second embodiment of the present disclosure. In the cross section along the plane including the axis of the stator core 10 of the gaps between all the coils U1 to U4, V1 to V4, and W1 to W4, as shown in FIG. Figure 8 As shown, when the length from the innermost end to the outermost end of the four first regions S1 in the radial direction is set to La, and the length from the innermost end to the outermost end of the two second regions S2 in the radial direction is set to Lb, the following relationship is satisfied:

[0076] La>Lb……(Formula 2).

[0077] By satisfying the relationship of the above-mentioned Expression 2, it is possible to ensure a passage cross-sectional area between the coils through which the refrigerant flows when the motor is used for a compressor.

[0078] The stator 1 of the second embodiment described above has the same effects as those of the stator 1 of the first embodiment.

[0079] In addition, Figure 8In the embodiment, four first regions S1 and two second regions S2 are provided, but the present disclosure is not limited thereto, and the present disclosure can also be applied to a stator including a plurality of first regions S1 and one or more second regions S2.

[0080] (Third Embodiment)

[0081] Fig. 9 2 is a cross-sectional view of a compressor 200 including a motor 240 according to a third embodiment of the present disclosure. This compressor is a scroll compressor.

[0082] like Fig. 9 As shown, the compressor 200 of the third embodiment comprises: a closed container 201; a compression mechanism 230, which includes a fixed scroll 210 and a movable scroll 220; a motor 240, which drives the compression mechanism 230; a crankshaft 250, which connects the compression mechanism 230 and the motor 240; and a lower bearing 260, which supports the lower end of the crankshaft 250 so that it can rotate.

[0083] The sealed container 201 includes a cylindrical member 202 that is generally cylindrical and has upper and lower openings, and an upper cover 203 and a lower cover 204 that are respectively provided at the upper end and the lower end of the cylindrical member 202 .

[0084] The motor 240 has the stator 1 of the first embodiment and the rotor 2 arranged radially inside the stator 1. The motor 240 is an inner rotor type motor, so-called 8-pole 12-slot. The number of poles and slots of the motor is not limited to this.

[0085] In the motor 240 , a plurality of lead wires from the stator 1 are connected to terminals of a terminal portion 270 provided in a cylindrical member 202 of the sealed container 201 .

[0086] By passing current through the coils U1 to U4, V1 to V4, and W1 to W4 ( Figure 3 , Figure 4 As shown in the figure, the electromagnetic force generated in the stator 1 causes the rotor 2 to rotate together with the crankshaft 250.

[0087] The motor 240 of the third embodiment described above can improve reliability by using the stator 1 of the first embodiment. Thus, a compressor 200 with high reliability can be realized.

[0088] In the third embodiment described above, the scroll compressor is described. However, the motor of the present disclosure may be applied to compressors of other structures such as a rotary compressor.

[0089] In the first to third embodiments described above, a stator for applying a three-phase AC voltage to a coil is described. However, the stator is not limited to a three-phase AC voltage, and the stator of the present disclosure may be applied to a stator for applying a two-phase or four-phase or more AC voltage to a coil.

[0090] Although specific embodiments of the present disclosure have been described, the present disclosure is not limited to the above-described first to third embodiments, and can be implemented with various modifications within the scope of the present disclosure.

[0091] Description of symbols

[0092] 1 Stator

[0093] 2 Rotors

[0094] 11 Back Yoke

[0095] 12 teeth

[0096] 10 Stator core

[0097] 20 Upper insulator

[0098] 30 Lower insulator

[0099] 110 Insulation cap

[0100] 111 Lead wire

[0101] 120 Insulation cap

[0102] 121 Lead wire

[0103] 200 Compressor

[0104] 201 Sealed container

[0105] 210 Fixed scroll

[0106] 220 movable scroll

[0107] 230 Compression mechanism

[0108] 240 Motor

[0109] 250 Crankshaft

[0110] 260 Lower bearing

[0111] 270 Terminal

[0112] cU1~cU4, cV1~cV4, cW1~cW4 Neutral line

[0113] eU1~eU4, eV 1~eV 4, eW1~eW4 power supply line

[0114] U1~U4、V1~V4、W1~W4 coils

[0115] X Ua , X Va , X Wa Connection

[0116] X Ub , X Vb , X Wb Connection

Claims

1. A stator, used for a motor (240), wherein the motor (240) is arranged in a sealed container (201) of a compressor, characterized in that: The stator has: a stator core (10) having a plurality of teeth (12); an insulator (20) mounted on an axial end surface of the stator core (10); a plurality of coils (U1-U4, V1-V4, W1-W4) respectively wound around the plurality of teeth (12) of the stator core (10); a first region (S1) in which terminal portions of power supply lines (eU1 to eU4, eV1 to eV4, eW1 to eW4) extending from one ends of the plurality of coils (U1 to U4, V1 to V4, W1 to W4) are connected to each other; and a second region (S2), in which the ends of the neutral lines (cU1 to cU4, cV1 to cV4, cW1 to cW4) extending from the other ends of the plurality of coils (U1 to U4, V1 to V4, W1 to W4) are connected to each other, The insulator (20) has an inner wall (20a) and an outer wall (20b) which are spaced apart in the radial direction of the stator core (10). A portion of the first region (S1) and a portion of the second region (S2) are located between the inner wall (20a) and the outer wall (20b) of the insulator (20) and above the stator core (10) in the axial direction. In a cross section of a gap between at least one pair of coils among the plurality of coils (U1 to U4, V1 to V4, W1 to W4) along a plane containing the axis of the stator core (10), the first region (S1) and the second region (S2) are located on the gap, and the center of gravity (O1) of the first region (S1) is located above the center of gravity (O2) of the second region (S2) in the axial direction of the stator core (10), and when the radial length of the first region (S1) is set to B, the radial length of the second region (S2) is set to C, and the radial length between the inner wall (20a) and the outer wall (20b) of the insulator (20) is set to A, the following relationship is satisfied: B<A and C<A……(Formula 1), When the first region (S1) and the second region (S2) are both one, C<B is satisfied, or, When there are a plurality of the first regions (S1) and one or more than two second regions (S2), In a cross section of the gaps between all the coils (U1 to U4, V1 to V4, W1 to W4) along a plane including the axis of the stator core (10), when the length from the radial innermost end to the radial outermost end of the plurality of first regions (S1) is set as La, and the length from the radial innermost end to the radial outermost end of one or more of the second regions (S2) is set as Lb, the following relationship is satisfied: La>Lb……(Formula 2), Therefore, the space near the coil end side is expanded, making the passage cross-sectional area between the coils wider.

2. The stator according to claim 1, characterized in that: In a cross section of a plane along the axis of the stator core (10) of the gaps between all the coils (U1 to U4, V1 to V4, W1 to W4), the center of gravity (O1) of the first region (S1) is located above the center of gravity (O2) of the second region (S2) in the axial direction of the stator core (10), and the relationship of Formula 1 is satisfied.

3. The stator according to claim 1, characterized in that: In a cross section along a plane including the axis of the stator core (10) over the entire circumference of the stator core (10), the center of gravity (O1) of the first region (S1) is located above the center of gravity (O2) of the second region (S2) in the axial direction of the stator core (10).

4. The stator according to any one of claims 1 to 3, characterized in that: The lower end of the first region (S1) is located above the upper end of the second region (S2) in the axial direction of the stator core (10).

5. A motor, characterized in that: The motor has: The stator (1) according to any one of claims 1 to 4; and A rotor (2) is arranged radially inside the stator (1).

6. A compressor, characterized in that: The compressor has: The sealed container (201); A compression mechanism (230) disposed in the sealed container (201); and The motor (240) described in claim 5 is arranged in the closed container (201) and drives the compression mechanism (230).

Images