Stator and motor operated valve

Abstract

To provide a stator and a motor-operated valve capable of suppressing deterioration of assembling workability and suppressing variation of torque of a motor.SOLUTION: The motor-operated valve has a valve body assembly and a stator unit 6. The stator unit 6 has a stator core 70. The stator core 70 includes a back yoke 71, an A-phase pole set 80, and a B-phase pole set 90. The back yoke 71 has an inner space 72 and an opening 73. The A-phase pole set 80 has an A-phase main pole 81a and an A-phase first auxiliary pole 85, which form magnetic circuits. The B-phase pole set 90 has a B-phase main pole 91a and a B-phase first auxiliary pole 95, which form magnetic circuits.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a stator and a motor-operated valve having a stator. [Background technology]

[0002] Patent Document 1 discloses an example of a conventional motor-operated valve. This motor-operated valve is incorporated into, for example, an air conditioner and used to control the flow rate of refrigerant. The motor-operated valve has a valve body assembly and a stator unit. The valve body assembly has a refrigerant inlet section, a flow rate control section, and a refrigerant outlet section that form a linear flow path, and a magnet rotor that is positioned inside the flow rate control section. The stator unit has a stator that is positioned outside the flow rate control section. The magnet rotor and stator form a stepping motor. The motor-operated valve is incorporated in series into the linear piping of the air conditioner. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-127256 Summary of the Invention [Problem to be solved by the invention]

[0004] The stator generally has an annular shape, and the valve body assembly is inserted inside the stator. FIG. 16 shows an example of a stator core of an annular stator. Stator core 770 of FIG. 16 integrally includes a back yoke 771 and a plurality of poles 781 (eight poles). Back yoke 771 has an annular shape. The plurality of poles 781 extend from the inner circumferential surface of back yoke 771 toward its central axis L. A-phase coils and B-phase coils (not shown) are wound around the plurality of poles 781. The A-phase coils and B-phase coils are arranged alternately in the circumferential direction.

[0005] The stator unit is preferably attached to the valve body assembly after the valve body assembly has been installed in the air conditioner's piping. However, because the stator has an annular shape, the stator unit must be attached to the valve body assembly before the valve body assembly is installed in the air conditioner's piping. Furthermore, the motor-operated valve (finished product) including the valve body assembly and stator unit is large and heavy, which can reduce the workability of installing the motor-operated valve in the air conditioner.

[0006] By using a C-shaped (arc-shaped) stator in an electric valve, the stator unit can be easily attached to the valve body assembly after the valve body assembly has been installed in the air conditioner piping. FIG. 17 shows an example of a stator core of a C-shaped stator. Stator core 870 in FIG. 17 has a back yoke 871 and a plurality of poles 881 (six poles). Back yoke 871 has a C-shape. The plurality of poles 881 extend from the inner surface of back yoke 871 toward its central axis L. A-phase coils and B-phase coils (not shown) are wound around the plurality of poles 881. The A-phase coils and B-phase coils are arranged alternately in the circumferential direction.

[0007] In Figures 16 and 17, [A] indicates a pole on which an A-phase coil wound in the forward direction is arranged, [A'] indicates a pole on which an A-phase coil wound in the reverse direction is arranged, [B] indicates a pole on which a B-phase coil wound in the forward direction is arranged, and [B'] indicates a pole on which a B-phase coil wound in the reverse direction is arranged.

[0008] In a motor-operated valve having a ring-shaped stator, when the A-phase coil and the B-phase coil are energized to rotate the rotor, the poles 781 are magnetized so that each pole 781 has one opposite polarity and one pole 781 of the same polarity adjacent to each other (FIGS. 18A to 18D). As a result, all of the poles 781 form a consistent magnetic circuit, and as shown in FIG. 20A, the magnitude of the torque when the rotor rotates by a predetermined angle is constant.

[0009] On the other hand, in an electrically operated valve having a C-shaped stator, when the A-phase coil and B-phase coil are energized to rotate the rotor, the four central poles 881 of the multiple poles 881 are magnetized so that each is adjacent to one pole 881 of the opposite polarity and one pole 881 of the same polarity. However, the poles 881 (881a) at both ends are sometimes adjacent to poles 881 of the opposite polarity (FIGS. 19A and 19C) and sometimes adjacent to poles 881 of the same polarity (FIGS. 19B and 19C). As a result, some of the multiple poles 781 may not form a magnetic circuit, and as shown in FIG. 20B, the magnitude of the torque varies when the rotor rotates by a predetermined angle.

[0010] In Figures 18A to 18D and Figures 19A to 19D, "+I" indicates that current is supplied to the A-phase coil and the B-phase coil flowing in one direction, "-I" indicates that current is supplied to the A-phase coil and the B-phase coil flowing in the other direction, and dashed lines schematically show magnetic circuits.

[0011] Therefore, an object of the present invention is to provide a stator and an electric valve that can suppress a decrease in assembly workability and suppress variations in motor torque. [Means for solving the problem]

[0012] In order to achieve the above object, one aspect of the present invention provides a stator for use in an electric valve, the stator having a stator core and a coil, the stator core having a back yoke and a pole set, the back yoke having an inner space extending from one end face to the other end face of the back yoke, and an opening provided on the outer surface of the back yoke, extending from the one end face to the other end face, and communicating with the inner space, the pole set having a main pole in which the coil is arranged, and an auxiliary pole, the main pole and the auxiliary pole protrude from an inner surface defining the inner space in the back yoke toward a central axis of the inner space and are adjacent around the central axis, and the auxiliary pole forms a magnetic circuit together with the main pole when the coil is energized.

[0013] In order to achieve the above object, another aspect of the present invention provides a stator for use in an electric valve, the stator having a stator core, a plurality of A-phase coils, and a plurality of B-phase coils, the stator core having a back yoke, an A-phase pole set, and a B-phase pole set, the back yoke having an inner space extending from one end face to the other end face of the back yoke, and an opening provided on an outer surface of the back yoke, extending from the one end face to the other end face, and communicating with the inner space, the A-phase pole set having a plurality of A-phase main poles and an A-phase first auxiliary pole, the B-phase pole set having a plurality of B-phase main poles and a B-phase first auxiliary pole, the plurality of A-phase main poles, the A-phase first auxiliary pole, the plurality of B-phase main poles, and the B-phase first auxiliary pole protrude from an inner surface of the back yoke that defines the inner space toward a central axis of the inner space, the plurality of A-phase main poles are arranged around the central axis, and the A-phase first auxiliary poles are a first auxiliary pole adjacent to an A-phase main pole at one end of the array of the plurality of A-phase main poles around the central axis, the plurality of B-phase main poles being arranged around the central axis, the B-phase first auxiliary pole adjacent to a B-phase main pole at one end of the array of the plurality of B-phase main poles around the central axis, the plurality of A-phase coils having A-phase coils wound in a forward direction and A-phase coils wound in a reverse direction alternately arranged on the plurality of A-phase main poles, The rotor has B-phase coils wound in a forward direction and B-phase coils wound in a reverse direction, which are arranged alternately, the A-phase first auxiliary pole forms a magnetic circuit together with the A-phase main pole when the plurality of A-phase coils are energized, the B-phase first auxiliary pole forms a magnetic circuit together with the B-phase main pole when the plurality of B-phase coils are energized, and the A-phase first auxiliary pole and the B-phase first auxiliary pole are adjacent to each other around the central axis and face the opening across the central axis.

[0014] In the present invention, it is preferable that the A-phase pole set further includes an A-phase second auxiliary pole, the B-phase pole set further includes a B-phase second auxiliary pole, the A-phase second auxiliary pole and the B-phase second auxiliary pole protrude from the inner surface toward the central axis, the A-phase second auxiliary pole is adjacent to the A-phase main pole at the other end of the arrangement of the plurality of A-phase main poles around the central axis, the B-phase second auxiliary pole is adjacent to the B-phase main pole at the other end of the arrangement of the plurality of B-phase main poles around the central axis, the A-phase second auxiliary pole forms a magnetic circuit together with the A-phase main pole when the plurality of A-phase coils are energized, and the B-phase second auxiliary pole forms a magnetic circuit together with the B-phase main pole when the plurality of B-phase coils are energized.

[0015] In order to achieve the above object, a stator according to another aspect of the present invention is a stator used in an electric valve, the stator having a stator core, an A-phase coil, and a B-phase coil, the stator core having a back yoke, an A-phase pole set, and a B-phase pole set, the back yoke having an inner space extending from one end face to the other end face of the back yoke, and an opening provided on an outer surface of the back yoke, extending from the one end face to the other end face, and communicating with the inner space, the A-phase pole set having an A-phase main pole on which the A-phase coil is arranged, an A-phase first auxiliary pole, and an A-phase second auxiliary pole, the B-phase pole set having a B-phase main pole on which the B-phase coil is arranged, a B-phase first auxiliary pole, and a B-phase second auxiliary pole, the A-phase first auxiliary pole, the A-phase main pole, the B-phase first auxiliary pole, and the B-phase second auxiliary pole protrude from an inner surface of the back yoke that defines the inner space toward a central axis of the inner space; the A-phase first auxiliary pole, the A-phase main pole, and the A-phase second auxiliary pole are arranged in this order around the central axis; the B-phase first auxiliary pole, the B-phase main pole, and the B-phase second auxiliary pole are arranged in this order around the central axis; the A-phase first auxiliary pole and the A-phase second auxiliary pole form a magnetic circuit with the A-phase main pole when the A-phase coil is energized; and the B-phase first auxiliary pole and the B-phase second auxiliary pole form a magnetic circuit with the B-phase main pole when the B-phase coil is energized; and the opening is disposed between the A-phase pole set and the B-phase pole set.

[0016] In order to achieve the above object, another aspect of the present invention is an electric valve having the stator and a valve body assembly, characterized in that the valve body assembly has a cylindrical shape and has a valve body arranged in the inner space, and a magnet rotor arranged inside the valve body and constituting a motor together with the stator, and a pipeline is connected to one end and the other end of the valve body. [Effects of the Invention]

[0017] According to the present invention, the back yoke has an inner space and an opening communicating with the inner space. This allows a pipe to be inserted into the inner space through the opening, and the valve body assembly to be disposed in the inner space. This prevents a decrease in assembly workability. Furthermore, the main pole with a coil disposed therein and the auxiliary pole without a coil disposed therein are adjacent to each other around the central axis of the inner space, and when the coil is energized, the main pole and the auxiliary pole form a magnetic circuit. This allows the main pole and the auxiliary pole to consistently form a magnetic circuit even when the current is switched. This prevents variations in motor torque. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a perspective view of a motor-operated valve according to an embodiment of the present invention; [Figure 2] FIG. 2 is a perspective view of a valve body assembly of the motor-operated valve. [Figure 3] FIG. 2 is a perspective view of a stator unit included in the motor-operated valve. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 5 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 2 is a cross-sectional view of a stator core included in the stator unit. [Figure 7] 1A to 1C are diagrams illustrating a method for assembling the motor-operated valve. [Figure 8] FIG. 1 is a diagram (part 1) showing a schematic diagram of a magnetic circuit formed in a stator core. [Figure 9] FIG. 2 is a diagram (part 2) schematically illustrating a magnetic circuit formed in a stator core. [Figure 10] FIG. 3 is a diagram (part 3) schematically illustrating a magnetic circuit formed in a stator core. [Figure 11] FIG. 4 is a diagram (part 4) schematically illustrating a magnetic circuit formed in a stator core. [Figure 12]FIG. 4 is a cross-sectional view showing the configuration of a first modified example of the stator unit of FIG. [Figure 13] 13 is a diagram schematically showing a magnetic circuit formed in a stator core of the stator unit of FIG. 12. FIG. [Figure 14] FIG. 4 is a cross-sectional view showing the configuration of a second modified example of the stator unit of FIG. [Figure 15] 15 is a diagram schematically showing a magnetic circuit formed in a stator core of the stator unit of FIG. 14. FIG. [Figure 16] FIG. 2 is a cross-sectional view of a stator core of an annular stator. [Figure 17] FIG. 2 is a cross-sectional view of a stator core of a C-shaped stator. [Figure 18] 17 is a diagram schematically showing a magnetic circuit formed in the stator core of FIG. 16. FIG. [Figure 19] 18 is a diagram schematically showing a magnetic circuit formed in the stator core of FIG. 17. FIG. [Figure 20] 10 is a graph showing the magnitude of torque when the rotor rotates. DETAILED DESCRIPTION OF THE INVENTION

[0019] A motor-operated valve according to one embodiment of the present invention will now be described with reference to FIGS.

[0020] FIG. 1 is a perspective view of a motor-operated valve according to an embodiment of the present invention. FIG. 2 is a perspective view of a valve body assembly included in the motor-operated valve. FIG. 3 is a perspective view of a stator unit included in the motor-operated valve. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4. FIG. 6 is a cross-sectional view of a stator core included in the stator unit. FIG. 7 is a diagram illustrating a method of assembling the motor-operated valve. FIGS. 8 to 11 are diagrams schematically illustrating magnetic circuits formed in the stator core.

[0021] The motor-operated valve 1 according to this embodiment is, for example, incorporated in series into a straight pipe of an air conditioner and is used to control the flow rate of a refrigerant.

[0022] As shown in FIGS. 1 to 3, the motor-operated valve 1 includes a valve body assembly 5 and a stator unit 6. The valve body assembly 5 and stator unit 6 are electrically connected to each other.

[0023] The valve body assembly 5 includes a valve body 10 and a rotor 30 .

[0024] The valve body 10 has a case 11, a cover member 12, and a valve seat member 13. The case 11, the cover member 12, and the valve seat member 13 are made of metal such as stainless steel or an aluminum alloy.

[0025] The case 11 has a cylindrical shape. The case 11 is disposed along an axis L. The cover member 12 has a disk shape. The cover member 12 is joined to one end 11a of the case 11 and closes the one end 11a.

[0026] The valve seat member 13 has a lid portion 14. The lid portion 14 has a disk shape. The lid portion 14 is joined to the other end 11b of the case 11 and closes the other end 11b.

[0027] The valve seat member 13 has a valve port (not shown) and a valve seat surrounding the valve port. The case 11, the cover member 12, and the valve seat member 13 form a valve chamber (not shown). A first pipe line 8 is joined to the cover member 12, and the first pipe line 8 is connected to the valve chamber. A second pipe line 9 is joined to the cover portion 14, and the second pipe line 9 is connected to the valve chamber through the valve port. The first pipe line 8 and the second pipe line 9 are pipes for the air conditioner.

[0028] The rotor 30 is a magnetic rotor. The rotor 30 has a cylindrical shape and is disposed in the valve chamber along the axis L. The rotor 30 is rotatable relative to the valve body 10. The rotor 30 has multiple magnetic poles (multiple north poles and multiple south poles). The multiple north poles and multiple south poles are alternately disposed at equal angular intervals in the circumferential direction (FIG. 8). The multiple north poles and multiple south poles extend in the direction of the axis L. The rotor 30 has, for example, 12 north poles and 12 south poles. The angle between two adjacent magnetic poles around the axis L (magnetic pole interval α) is 15 degrees.

[0029] A valve element (not shown) is connected to the rotor 30. When the rotor 30 rotates in one direction, the valve element approaches the valve seat, narrowing the opening of the valve port. When the rotor 30 rotates in the other direction, the valve element moves away from the valve seat, widening the opening of the valve port.

[0030] The stator unit 6 is disposed along the axis L. The stator unit 6 is attached to the valve body assembly 5. As shown in FIGS. 4 and 5 , the stator unit 6 has a stator 60 and a cover 100.

[0031] The stator 60 and the rotor 30 form a stepping motor. The rotor 30 and the stator 60 may form a motor other than a stepping motor. The stator 60 has a stator core 70, a plurality of A-phase coils 88, and a plurality of B-phase coils 98.

[0032] The stator core 70 is formed by stacking, for example, a plurality of thin electromagnetic steel plates. As shown in Fig. 6, the stator core 70 has a back yoke 71, an A-phase pole set 80, and a B-phase pole set 90.

[0033] The back yoke 71 has a substantially cylindrical shape. The back yoke 71 has an inner space 72 and an opening 73. The inner space 72 extends from one end surface 71a to the other end surface 71b of the back yoke 71. The opening 73 is provided in an outer surface 71c of the back yoke 71 and extends from the one end surface 71a to the other end surface 71b. The opening 73 communicates with the inner space 72. An inner surface 71d of the back yoke 71 defines the inner space 72. The back yoke 71 has a C-shape (arcuate shape) when viewed from the direction of the axis L.

[0034] The A-phase pole set 80 has a plurality of A-phase main poles 81 (for example, three A-phase main poles 81) and an A-phase first auxiliary pole 85. The plurality of A-phase main poles 81 and the A-phase first auxiliary pole 85 protrude from the inner surface 71d of the back yoke 71 toward the axis L. The plurality of A-phase main poles 81 and the A-phase first auxiliary pole 85 extend from one end surface 71a to the other end surface 71b of the back yoke 71.

[0035] The multiple A-phase main poles 81 are lined up around the axis L. In the following description, the pole at one end of the array of multiple A-phase main poles 81 is referred to as A-phase main pole 81a, the pole in the middle as A-phase main pole 81b, and the pole at the other end as A-phase main pole 81c. The A-phase pole set 80 may have two A-phase main poles 81, or may have four or more A-phase main poles 81.

[0036] Each of the multiple A-phase main poles 81 has a support post 82 and two teeth 83. The support post 82 extends from the inner surface 71d toward the axis L. An A-phase coil 88 is wound around the support post 82. The two teeth 83 are disposed at the tip of the support post 82 and are aligned around the axis L. The distance (angle) between the two teeth 83 around the axis L is twice the magnetic pole spacing α. The width (angle) of each tooth 83 around the axis L is half the magnetic pole spacing α. The distance (angle) between the teeth 83 of two adjacent A-phase main poles around the axis L is the same as the magnetic pole spacing α.

[0037] The A-phase first auxiliary pole 85 is adjacent to the A-phase main pole 81a around the axis L. The width (angle) of the tip of the A-phase first auxiliary pole 85 around the axis L is half the magnetic pole spacing α. The spacing (angle) between the tip of the A-phase first auxiliary pole 85 and the tooth 83 of the A-phase main pole 81a around the axis L is the same as the magnetic pole spacing α.

[0038] The B-phase pole set 90 has a plurality of B-phase main poles 91 (for example, three B-phase main poles 91) and a B-phase first auxiliary pole 95. The plurality of B-phase main poles 91 and the B-phase first auxiliary pole 95 protrude from the inner surface 71d of the back yoke 71 toward the axis L. The plurality of B-phase main poles 91 and the B-phase first auxiliary pole 95 extend from one end surface 71a to the other end surface 71b of the back yoke 71.

[0039] The multiple B-phase main poles 91 are lined up around the axis L. In the following description, the pole at one end of the array of multiple B-phase main poles 91 will be referred to as B-phase main pole 91a, the pole in the middle as B-phase main pole 91b, and the pole at the other end as B-phase main pole 91c. The B-phase pole set 90 may have two B-phase main poles 91, or may have four or more B-phase main poles 91.

[0040] Each of the multiple B-phase main poles 91 has a support post 92 and two teeth 93. The support post 92 extends from the inner surface 71d toward the axis L. A B-phase coil 98 is wound around the support post 92. The two teeth 93 are arranged at the tip of the support post 92 and are aligned around the axis L. The distance (angle) between the two teeth 93 around the axis L is twice the magnetic pole spacing α. The width (angle) of each tooth 93 around the axis L is half the magnetic pole spacing α. The distance (angle) between the teeth 93 of two adjacent B-phase main poles around the axis L is the same as the magnetic pole spacing α.

[0041] The B-phase first auxiliary pole 95 is adjacent to the B-phase main pole 91a around the axis L. The width (angle) of the tip of the B-phase first auxiliary pole 95 around the axis L is half the magnetic pole spacing α. The spacing (angle) between the tip of the B-phase first auxiliary pole 95 and the tooth 93 of the B-phase main pole 91a around the axis L is the same as the magnetic pole spacing α.

[0042] The A-phase pole set 80 and the B-phase pole set 90 face each other across the axis L. The A-phase pole set 80 and the B-phase pole set 90 are mirror images of each other. The number of A-phase main poles 81 in the A-phase pole set 80 is the same as the number of B-phase main poles 91 in the B-phase pole set 90. The A-phase first auxiliary pole 85 and the B-phase first auxiliary pole 95 are adjacent to each other around the axis L. The A-phase first auxiliary pole 85 and the B-phase first auxiliary pole 95 face each other across the axis L and the opening 73.

[0043] The multiple A-phase coils 88 include A-phase coils 88 wound in the forward direction and A-phase coils 88 wound in the reverse direction, which are alternately arranged around the axis L on the multiple A-phase main poles 81. Specifically, the A-phase coil 88 wound in the forward direction is arranged on the A-phase main pole 81b (center), and the A-phase coils 88 wound in the reverse direction are arranged on the A-phase main poles 81a and 81c (one end and the other end). The multiple A-phase coils 88 are connected in series. When the multiple A-phase coils 88 are energized, the A-phase main pole 81b and the A-phase main poles 81a and 81c are magnetized to polarities opposite to each other. No coil is arranged on the A-phase first auxiliary pole 85.

[0044] The multiple B-phase coils 98 include B-phase coils 98 wound in the forward direction and B-phase coils 98 wound in the reverse direction, which are alternately arranged around the axis L on the multiple B-phase main poles 91. Specifically, the B-phase coil 98 wound in the forward direction is arranged on the B-phase main pole 91b (center), and the B-phase coils 98 wound in the reverse direction are arranged on the B-phase main poles 91a and 91c (one end and the other end). The multiple B-phase coils 98 are connected in series. When the multiple B-phase coils 98 are energized, the B-phase main pole 91b and the B-phase main poles 91a and 91c are magnetized to polarities opposite to each other. No coil is arranged on the B-phase first auxiliary pole 95.

[0045] The multiple A-phase coils 88 and the multiple B-phase coils 98 are monofilar-wound coils. A monofilar-wound coil is composed of a single coil wound in one direction. The multiple A-phase coils 88 and the multiple B-phase coils 98 may be bifilar-wound coils. A bifilar-wound coil is composed of two coils wound in the forward and reverse directions, or a coil wound in one direction with a common terminal drawn from its midpoint. When the multiple A-phase coils 88 are bifilar-wound, current is applied to the multiple A-phase coils 88 so that the A-phase main pole 81b and the A-phase main poles 81a and 81c are magnetized with polarities opposite to each other. When the multiple B-phase coils 98 are bifilar-wound, current is applied to the multiple B-phase coils 98 so that the B-phase main pole 91b and the B-phase main poles 91a and 91c are magnetized with polarities opposite to each other.

[0046] The cover 100 has a shape that follows the outer shape of the stator 60 and covers the stator 60. The cover 100 has a C-shape (arc shape) when viewed from the direction of the axis L. The cover 100 is made of synthetic resin and is molded integrally with the stator 60. The inner surface of the cover 100, together with the two teeth 83 of the A-phase main pole 81, the tip of the A-phase first auxiliary pole 85, the two teeth 93 of the B-phase main pole 91, and the tip of the B-phase first auxiliary pole 95, forms the inner surface 6d of the stator unit 6. In the stator unit 6, the cover 100 may be omitted.

[0047] The stator unit 6 has an inner space 6s and an opening 6e. The inner space 6s extends from one end face 6a to the other end face 6b of the stator unit 6. The opening 6e is provided on the outer surface 6c of the stator unit 6, extends from the one end face 6a to the other end face 6b, and communicates with the inner space 6s. The inner space 6s is defined by the inner surface 6d of the stator unit 6. The diameter of the inner space 6s is the same as the diameter of the valve body assembly 5. The valve body assembly 5 is disposed in the inner space 6s. A central portion of the inner space 6s overlaps with the inner space 72 of the stator core 70. A central portion of the opening 6e overlaps with the opening 73 of the stator core 70. The width of the opening 6e (opening 73) is greater than the outer diameters of the first pipe line 8 and the second pipe line 9.

[0048] In this embodiment, the central axes of the valve body assembly 5 (valve body 10 and rotor 30), the stator unit 6 (inner space 6s, stator 60 and cover 100), the first pipe line 8 and the second pipe line 9 coincide with the axis L. The central axis of the inner space 72 of the back yoke 71 coincides with the axis L.

[0049] Next, a method for attaching the stator unit 6 to the valve body assembly 5 will be described with reference to FIGS. 7A to 7C.

[0050] As shown in FIG. 7A, a first pipeline 8 and a second pipeline 9 are joined to the valve body assembly 5, and the opening 6e of the stator unit 6 is aligned with the first pipeline 8, and the stator unit 6 is moved toward the first pipeline 8.

[0051] As shown in FIG. 7B, the first pipe 8 is inserted into the inner space 6s through the opening 6e of the stator unit 6, and the first pipe 8 is disposed coaxially in the inner space 6s of the stator unit 6.

[0052] As shown in Fig. 7C, the stator unit 6 is moved in the direction of the axis L, and the valve body assembly 5 is inserted into the inner space 6s of the stator unit 6. Then, the stator unit 6 is attached to the valve body assembly 5 by an attachment mechanism (not shown), and the motor-operated valve 1 is completed.

[0053] Next, the magnetic circuit formed in stator core 70 when A-phase coil 88 and B-phase coil 98 of stator 60 are energized will be described with reference to FIGS.

[0054] 8 to 11, [A] indicates A-phase main pole 81 on which A-phase coil 88 wound in the forward direction is arranged, [A'] indicates A-phase main pole 81 on which A-phase coil 88 wound in the reverse direction is arranged, [B] indicates B-phase main pole 91 on which B-phase coil 98 wound in the forward direction is arranged, and [B'] indicates B-phase main pole 91 on which B-phase coil 98 wound in the reverse direction is arranged. In Figures 8 to 11, "+I" indicates that current is supplied to A-phase coil 88 and B-phase coil 98 flowing in one direction, and "-I" indicates that current is supplied to A-phase coil 88 and B-phase coil 98 flowing in the other direction. Dashed lines schematically indicate magnetic circuits, and a black circle is attached to the magnetic pole that serves as the reference for rotor 30.

[0055] A current is supplied to the A-phase coil 88 in one direction, When a current flowing in the other direction is supplied to the B-phase coil 98, The A-phase main poles 81a, 81b, and 81c are the south pole, north pole, and south pole, respectively. The B-phase main poles 91a, 91b, and 91c serve as north pole, south pole, and north pole. This means: The A-phase first auxiliary pole 85 and the A-phase main pole 81a form a magnetic circuit Ma1, The A-phase main pole 81a and the A-phase main pole 81b form a magnetic circuit Ma2, The A-phase main pole 81b and the A-phase main pole 81c form a magnetic circuit Ma3, The B-phase first auxiliary pole 95 and the B-phase main pole 91a form a magnetic circuit Mb1, The B-phase main pole 91a and the B-phase main pole 91b form a magnetic circuit Mb2, The B-phase main pole 91b and the B-phase main pole 91c form a magnetic circuit Mb3. The rotor 30 is rotated clockwise by an angle equal to half the magnetic pole spacing α and is positioned at the position shown in FIG.

[0056] A current is supplied to the A-phase coil 88 in one direction, When a current flows in one direction through the B-phase coil 98, The A-phase main poles 81a, 81b, and 81c are the south pole, north pole, and south pole, respectively. The B-phase main poles 91a, 91b, and 91c serve as the south pole, north pole, and south pole. This means: The A-phase first auxiliary pole 85 and the A-phase main pole 81a form a magnetic circuit Ma1, The A-phase main pole 81a and the A-phase main pole 81b form a magnetic circuit Ma2, The A-phase main pole 81b and the A-phase main pole 81c form a magnetic circuit Ma3, The B-phase first auxiliary pole 95 and the B-phase main pole 91a form a magnetic circuit Mb1, The B-phase main pole 91a and the B-phase main pole 91b form a magnetic circuit Mb2, The B-phase main pole 91b and the B-phase main pole 91c form a magnetic circuit Mb3. The rotor 30 is rotated clockwise by an angle equal to half the magnetic pole spacing α and is positioned at the position shown in FIG.

[0057] Supplying current to the A-phase coil 88 in the other direction, When a current flows in one direction through the B-phase coil 98, The A-phase main poles 81a, 81b, and 81c are N-pole, S-pole, and N-pole, The B-phase main poles 91a, 91b, and 91c serve as the south pole, north pole, and south pole. This means: The A-phase first auxiliary pole 85 and the A-phase main pole 81a form a magnetic circuit Ma1, The A-phase main pole 81a and the A-phase main pole 81b form a magnetic circuit Ma2, The A-phase main pole 81b and the A-phase main pole 81c form a magnetic circuit Ma3, The B-phase first auxiliary pole 95 and the B-phase main pole 91a form a magnetic circuit Mb1, The B-phase main pole 91a and the B-phase main pole 91b form a magnetic circuit Mb2, The B-phase main pole 91b and the B-phase main pole 91c form a magnetic circuit Mb3. The rotor 30 is rotated clockwise by an angle equal to half the magnetic pole spacing α and is positioned at the position shown in FIG.

[0058] Supplying current to the A-phase coil 88 in the other direction, When a current flowing in the other direction is supplied to the B-phase coil 98, The A-phase main poles 81a, 81b, and 81c are N-pole, S-pole, and N-pole, The B-phase main poles 91a, 91b, and 91c serve as north pole, south pole, and north pole. This means: The A-phase first auxiliary pole 85 and the A-phase main pole 81a form a magnetic circuit Ma1, The A-phase main pole 81a and the A-phase main pole 81b form a magnetic circuit Ma2, The A-phase main pole 81b and the A-phase main pole 81c form a magnetic circuit Ma3, The B-phase first auxiliary pole 95 and the B-phase main pole 91a form a magnetic circuit Mb1, The B-phase main pole 91a and the B-phase main pole 91b form a magnetic circuit Mb2, The B-phase main pole 91b and the B-phase main pole 91c form a magnetic circuit Mb3. The rotor 30 is rotated clockwise by an angle equal to half the magnetic pole spacing α and is positioned at the position shown in FIG.

[0059] In this way, when current is supplied to the A-phase coils 88 and B-phase coils 98 so as to rotate the rotor 30, all of the A-phase main poles 81 and all of the B-phase main poles 91 consistently form a magnetic circuit, and a similar magnetic circuit is formed even when the current is switched.

[0060] As described above, the motor-operated valve 1 includes a valve body assembly 5 and a stator unit 6. The valve body assembly 5 has a cylindrical shape and includes a valve body 10 disposed in the inner space 6s of the stator unit 6 (the inner space 72 of the stator core 70), and a rotor 30 disposed inside a case 11 of the valve body 10. A first pipe line 8 is connected to a cover member 12 of the valve body 10 (one end of the valve body 10). A second pipe line 9 is connected to a valve seat member 13 of the valve body 10 (the other end of the valve body 10).

[0061] The stator unit 6 has a stator 60. The stator 60 has a stator core 70, a plurality of A-phase coils 88, and a plurality of B-phase coils 98. The stator core 70 has a back yoke 71, an A-phase pole set 80, and a B-phase pole set 90. The back yoke 71 has an inner space 72 extending from one end face 71a to the other end face 71b, and an opening 73 provided on the outer surface 71c, extending from the one end face 71a to the other end face 71b, and communicating with the inner space 72. The A-phase pole set 80 has a plurality of A-phase main poles 81 and an A-phase first auxiliary pole 85. The B-phase pole set 90 has a plurality of B-phase main poles 91 and a B-phase first auxiliary pole 95. A plurality of A-phase main poles 81, A-phase first auxiliary poles 85, and a plurality of B-phase main poles 91 and B-phase first auxiliary poles 95 protrude from the inner surface 71d of the back yoke 71 toward the axis L. The plurality of A-phase main poles 81 are arranged around the axis L, and the A-phase first auxiliary pole 85 is adjacent to the A-phase main pole 81a at one end of the arrangement of the plurality of A-phase main poles 81, about the axis L. The plurality of B-phase main poles 91 are arranged around the axis L, and the B-phase first auxiliary pole 95 is adjacent to the B-phase main pole 91a at one end of the arrangement of the plurality of B-phase main poles 91, about the axis L. The plurality of A-phase coils 88 include A-phase coils 88 wound in the forward direction and A-phase coils 88 wound in the reverse direction, which are arranged alternately on the plurality of A-phase main poles 81. The multiple B-phase coils 98 are arranged alternately on the multiple B-phase main poles 91, with the B-phase coils 98 wound in the forward direction and the B-phase coils 98 wound in the reverse direction. When the multiple A-phase coils 88 are energized, the A-phase first auxiliary pole 85 forms a magnetic circuit Ma1 together with the A-phase main pole 81a. When the multiple B-phase coils 98 are energized, the B-phase first auxiliary pole 95 forms a magnetic circuit Mb1 together with the B-phase main pole 91a. The A-phase first auxiliary pole 85 and the B-phase first auxiliary pole 95 are adjacent to each other around the axis L and face the opening 73 with the axis L in between.

[0062] The stator unit 6 has an inner space 6s (an inner space 72 of the back yoke 71) and an opening 6e (an opening 73 of the back yoke 71). As a result, the air conditioner piping can be inserted into the inner space 6s through the opening 6e, and the valve body assembly 5 can be disposed in the inner space 6s. This prevents a decrease in the ease of assembly of the motor-operated valve 1.

[0063] Furthermore, for example, in a configuration in which the stator core 70 does not have the A-phase first auxiliary pole 85 and the B-phase first auxiliary pole 95, instead of the magnetic circuits Ma1 and Mb1, the A-phase main pole 81a and the B-phase main pole 91a have opposite polarities and form a magnetic circuit in the state shown in FIGS. 8 and 10 . However, in the state shown in FIGS. 9 and 11 , the A-phase main pole 81a and the B-phase main pole 91a have the same polarity and do not form a magnetic circuit. This results in variations in the magnitude of torque when the rotor 30 rotates. On the other hand, in the stator 60 according to this embodiment, the A-phase main pole 81a and the A-phase first auxiliary pole 85 are adjacent to each other around the axis L. When the A-phase coil 88 is energized, the A-phase main pole 81a and the A-phase first auxiliary pole 85 form the magnetic circuit Ma1. The B-phase main pole 91a and the B-phase first auxiliary pole 95 are adjacent to each other around the axis L, and when the B-phase coil 98 is energized, the B-phase main pole 91a and the B-phase first auxiliary pole 95 form a magnetic circuit Mb1. Therefore, even when the current is switched, the same magnetic circuit is formed, so the magnitude of the torque when the rotor 30 rotates is constant. This makes it possible to suppress variations in the torque of the stepping motor of the motor-operated valve 1.

[0064] Next, modified examples of the stator unit 6 will be described with reference to Figures 12 to 15. In the description of each embodiment, the same components (including components that are substantially the same) as those of the stator unit 6 described above will be assigned the same reference numerals, and detailed description thereof will be omitted.

[0065] Fig. 12 is a cross-sectional view of a stator unit 6A according to a first modified example of the stator unit 6. Fig. 13 is a diagram schematically showing a magnetic circuit formed in a stator core 70A included in the stator unit 6A of Fig. 12. In Fig. 13, dashed lines schematically show the magnetic circuit.

[0066] The stator unit 6A includes a stator 60A and a cover 100. The stator 60A includes a stator core 70A, a plurality of A-phase coils 88, and a plurality of B-phase coils 98. The stator core 70A includes a back yoke 71, an A-phase pole set 80A, and a B-phase pole set 90A.

[0067] The A-phase pole set 80A has a plurality of A-phase main poles 81 (A-phase main poles 81a, 81b, 81c), an A-phase first auxiliary pole 85, and an A-phase second auxiliary pole 86. The plurality of A-phase main poles 81, the A-phase first auxiliary pole 85, and the A-phase second auxiliary pole 86 protrude from the inner surface 71d of the back yoke 71 toward the axis L. The A-phase main pole 81, the A-phase first auxiliary pole 85, and the A-phase second auxiliary pole 86 extend from one end surface 71a to the other end surface 71b of the back yoke 71.

[0068] The A-phase second auxiliary pole 86 is adjacent to the A-phase main pole 81c around the axis L. The width (angle) of the tip of the A-phase second auxiliary pole 86 around the axis L is half the magnetic pole spacing α. The spacing (angle) between the tip of the A-phase second auxiliary pole 86 and the tooth 83 of the A-phase main pole 81c around the axis L is the same as the magnetic pole spacing α.

[0069] The B-phase pole set 90A has a plurality of B-phase main poles 91 (B-phase main poles 91a, 91b, 91c), a first B-phase auxiliary pole 95, and a second B-phase auxiliary pole 96. The plurality of B-phase main poles 91, the first B-phase auxiliary pole 95, and the second B-phase auxiliary pole 96 protrude from the inner surface 71d of the back yoke 71 toward the axis L. The plurality of B-phase main poles 91, the first B-phase auxiliary pole 95, and the second B-phase auxiliary pole 96 extend from one end surface 71a to the other end surface 71b of the back yoke 71.

[0070] The B-phase second auxiliary pole 96 is adjacent to the B-phase main pole 91c around the axis L. The width (angle) of the tip of the B-phase second auxiliary pole 96 about the axis L is half the magnetic pole spacing α. The spacing (angle) between the tip of the B-phase second auxiliary pole 96 and the tooth 93 of the B-phase main pole 91c about the axis L is the same as the magnetic pole spacing α. An opening 73 in the back yoke 71 is located between the A-phase second auxiliary pole 86 and the B-phase second auxiliary pole 96.

[0071] When current is supplied to the A-phase coil 88 and the B-phase coil 98, The A-phase first auxiliary pole 85 and the A-phase main pole 81a form a magnetic circuit Ma1, The A-phase main pole 81a and the A-phase main pole 81b form a magnetic circuit Ma2, The A-phase main pole 81b and the A-phase main pole 81c form a magnetic circuit Ma3, The A-phase main pole 81c and the A-phase second auxiliary pole 86 form a magnetic circuit Ma4, The B-phase first auxiliary pole 95 and the B-phase main pole 91a form a magnetic circuit Mb1, The B-phase main pole 91a and the B-phase main pole 91b form a magnetic circuit Mb2, The B-phase main pole 91b and the B-phase main pole 91c form a magnetic circuit Mb3, B-phase main pole 91c and B-phase second auxiliary pole 96 form a magnetic circuit Mb4.

[0072] In the stator unit 6A, when current is supplied to the A-phase coils 88 and the B-phase coils 98 so that the rotor 30 rotates, all of the A-phase main poles 81 and all of the B-phase main poles 91 consistently form a magnetic circuit, and a similar magnetic circuit is formed even when the current is switched.

[0073] Fig. 14 is a cross-sectional view of a stator unit 6B according to a second modified example of the stator unit 6. Fig. 15 is a diagram schematically showing a magnetic circuit formed in a stator core 70B included in the stator unit 6B of Fig. 14. In Fig. 15, dashed lines schematically show the magnetic circuit.

[0074] The stator unit 6B includes a stator 60B and a cover 100. The stator 60B includes a stator core 70B, a plurality of A-phase coils 88, and a plurality of B-phase coils 98. The stator core 70B includes a back yoke 71, two A-phase pole sets 80B, and two B-phase pole sets 90B.

[0075] The A-phase pole set 80B has an A-phase main pole 81, an A-phase first auxiliary pole 85, and an A-phase second auxiliary pole 86. The A-phase main pole 81, the A-phase first auxiliary pole 85, and the A-phase second auxiliary pole 86 protrude from the inner surface 71d of the back yoke 71 toward the axis L. The A-phase main pole 81, the A-phase first auxiliary pole 85, and the A-phase second auxiliary pole 86 extend from one end surface 71a to the other end surface 71b of the back yoke 71.

[0076] The A-phase first auxiliary pole 85, the A-phase main pole 81, and the A-phase second auxiliary pole 86 are arranged in this order around the axis L. The distance (angle) between the tip of the A-phase first auxiliary pole 85 and the tooth 83 of the A-phase main pole 81 around the axis L is the same as the magnetic pole spacing α. The distance (angle) between the tip of the A-phase second auxiliary pole 86 and the tooth 83 of the A-phase main pole 81 around the axis L is the same as the magnetic pole spacing α.

[0077] The B-phase pole set 90B has a B-phase main pole 91, a B-phase first auxiliary pole 95, and a B-phase second auxiliary pole 96. The B-phase main pole 91, the B-phase first auxiliary pole 95, and the B-phase second auxiliary pole 96 protrude from the inner surface 71d of the back yoke 71 toward the axis L. The B-phase main pole 91, the B-phase first auxiliary pole 95, and the B-phase second auxiliary pole 96 extend from one end surface 71a to the other end surface 71b of the back yoke 71.

[0078] The B-phase first auxiliary pole 95, the B-phase main pole 91, and the B-phase second auxiliary pole 96 are arranged in this order around the axis L. The distance (angle) between the tip of the B-phase first auxiliary pole 95 and the tooth 93 of the B-phase main pole 91 around the axis L is the same as the magnetic pole spacing α. The distance (angle) between the tip of the B-phase second auxiliary pole 96 and the tooth 93 of the B-phase main pole 91 around the axis L is the same as the magnetic pole spacing α.

[0079] In Figure 14, the A-phase main pole 81, A-phase first auxiliary pole 85, and A-phase second auxiliary pole 86 that make up the A-phase pole set 80B are surrounded by a dotted line, and the B-phase main pole 91, B-phase first auxiliary pole 95, and B-phase second auxiliary pole 96 that make up the B-phase pole set 90B are surrounded by a dotted line.

[0080] The A-phase pole sets 80B and the B-phase pole sets 90B are arranged alternately around the axis L. The two A-phase pole sets 80B face each other across the axis L. One of the two A-phase pole sets 80B has an A-phase main pole 81 on which an A-phase coil 88 wound in the forward direction is arranged, and the other has an A-phase main pole 81 on which an A-phase coil 88 wound in the reverse direction is arranged. The two B-phase pole sets 90B face each other across the axis L. One of the two B-phase pole sets 90B has a B-phase main pole 91 on which a B-phase coil 98 wound in the forward direction is arranged, and the other has a B-phase main pole 91 on which a B-phase coil 98 wound in the reverse direction is arranged.

[0081] When current is supplied to the A-phase coil 88 and the B-phase coil 98, The A-phase first auxiliary pole 85 and the A-phase main pole 81 form a magnetic circuit Ma1, The A-phase second auxiliary pole 86 and the A-phase main pole 81 form a magnetic circuit Ma2, The B-phase first auxiliary pole 95 and the B-phase main pole 91 form a magnetic circuit Mb1, B-phase second auxiliary pole 96 and B-phase main pole 91 form a magnetic circuit Mb2.

[0082] In the stator unit 6B, when current is supplied to the A-phase coils 88 and the B-phase coils 98 so that the rotor 30 rotates, all of the A-phase main poles 81 and all of the B-phase main poles 91 consistently form a magnetic circuit, and a similar magnetic circuit is formed even when the current is switched.

[0083] The stator core 70B may have only one A-phase pole set 80B or may have three or more A-phase pole sets 80B. The stator core 70B may have only one B-phase pole set 90B or may have three or more B-phase pole sets 90B. The number of A-phase pole sets 80B and the number of B-phase pole sets 90B are the same.

[0084] The motor-operated valve having the stator units 6A and 6B also achieves the same effects as the motor-operated valve 1.

[0085] In this specification, terms indicating a shape, such as "cylinder" or "column," are also used to refer to members or portions of members that substantially have the shape of the term. For example, a "cylindrical member" includes both a cylindrical member and a substantially cylindrical member. In addition, in this specification, the term "same" can include both the exact same and the substantially same.

[0086] Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. Any modifications, additions, deletions, or design changes of components made by a person skilled in the art to the above embodiments, or any combinations of features of the embodiments, are also included within the scope of the present invention as long as they do not deviate from the spirit of the present invention. [Explanation of symbols]

[0087] 1...motor valve, 8...first pipe, 9...second pipe, 5... valve body assembly, 10... valve body, 30... rotor, 6... stator unit, 60... stator, 100... cover, 70... stator core, 71... back yoke, 72... inner space, 73... opening, 80...A phase pole set, 81...A phase main pole, 85...A phase first auxiliary pole, 86...A phase second auxiliary pole, 88...A phase coil, 90...B phase pole set, 91...B phase main pole, 95...B phase first auxiliary pole, 96...B phase second auxiliary pole, 98...B phase coil, L…Axis line

Claims

1. A stator used in an electric valve, The stator has a stator core and a coil, The stator core has a back yoke and a pole set, the back yoke has an inner space extending from one end surface to the other end surface of the back yoke, and an opening provided on an outer surface of the back yoke, extending from the one end surface to the other end surface, and communicating with the inner space; the pole set includes a main pole on which the coil is disposed and an auxiliary pole; the main pole and the auxiliary pole protrude from an inner surface of the back yoke that defines the inner space toward a central axis of the inner space and are adjacent to each other around the central axis; A stator characterized in that the auxiliary pole forms a magnetic circuit together with the main pole when the coil is energized.

2. A stator used in an electric valve, the stator has a stator core, a plurality of A-phase coils, and a plurality of B-phase coils, the stator core has a back yoke, an A-phase pole set, and a B-phase pole set, the back yoke has an inner space extending from one end surface to the other end surface of the back yoke, and an opening provided on an outer surface of the back yoke, extending from the one end surface to the other end surface, and communicating with the inner space; the A-phase pole set includes a plurality of A-phase main poles and an A-phase first auxiliary pole; the B-phase pole set includes a plurality of B-phase main poles and a B-phase first auxiliary pole; the plurality of A-phase main poles, the A-phase first auxiliary pole, the plurality of B-phase main poles, and the B-phase first auxiliary pole protrude from an inner surface of the back yoke that defines the inner space toward a central axis of the inner space, the plurality of A-phase main poles are arranged around the central axis, the A-phase first auxiliary pole is adjacent to an A-phase main pole at one end of the arrangement of the plurality of A-phase main poles around the central axis, the plurality of B-phase main poles are arranged around the central axis, the B-phase first auxiliary pole is adjacent to a B-phase main pole at one end of the arrangement of the plurality of B-phase main poles around the central axis, the plurality of A-phase coils include A-phase coils wound in a forward direction and A-phase coils wound in a reverse direction, which are alternately arranged on the plurality of A-phase main poles, the plurality of B-phase coils include B-phase coils wound in a forward direction and B-phase coils wound in a reverse direction, which are alternately arranged on the plurality of B-phase main poles, the A-phase first auxiliary pole forms a magnetic circuit together with the A-phase main pole when the plurality of A-phase coils are energized; the B-phase first auxiliary pole forms a magnetic circuit together with the B-phase main pole when the plurality of B-phase coils are energized; a stator, wherein the A-phase first auxiliary pole and the B-phase first auxiliary pole are adjacent to each other around the central axis and face the opening across the central axis.

3. the A-phase pole set further includes an A-phase second auxiliary pole; the B-phase pole set further includes a B-phase second auxiliary pole, the A-phase second auxiliary pole and the B-phase second auxiliary pole protrude from the inner surface toward the central axis, the A-phase second auxiliary pole is adjacent to the A-phase main pole at the other end of the row of the plurality of A-phase main poles around the central axis, the B-phase second auxiliary pole is adjacent to the B-phase main pole at the other end of the row of the plurality of B-phase main poles around the central axis, the A-phase second auxiliary pole forms a magnetic circuit together with the A-phase main pole when the plurality of A-phase coils are energized; The stator according to claim 2 , wherein the B-phase second auxiliary pole forms a magnetic circuit together with the B-phase main pole when the plurality of B-phase coils are energized.

4. A stator used in an electric valve, the stator has a stator core, an A-phase coil, and a B-phase coil, the stator core has a back yoke, an A-phase pole set, and a B-phase pole set, the back yoke has an inner space extending from one end surface to the other end surface of the back yoke, and an opening provided on an outer surface of the back yoke, extending from the one end surface to the other end surface, and communicating with the inner space; the A-phase pole set includes an A-phase main pole on which the A-phase coil is arranged, an A-phase first auxiliary pole, and an A-phase second auxiliary pole, the B-phase pole set includes a B-phase main pole on which the B-phase coil is arranged, a B-phase first auxiliary pole, and a B-phase second auxiliary pole, the A-phase main pole, the A-phase first auxiliary pole, the A-phase second auxiliary pole, the B-phase main pole, the B-phase first auxiliary pole, and the B-phase second auxiliary pole protrude from an inner surface of the back yoke that defines the inner space toward a central axis of the inner space, the A-phase first auxiliary pole, the A-phase main pole, and the A-phase second auxiliary pole are arranged in this order around the central axis, the B-phase first auxiliary pole, the B-phase main pole, and the B-phase second auxiliary pole are arranged in this order around the central axis, the A-phase first auxiliary pole and the A-phase second auxiliary pole form a magnetic circuit together with the A-phase main pole when the A-phase coil is energized, the B-phase first auxiliary pole and the B-phase second auxiliary pole form a magnetic circuit together with the B-phase main pole when the B-phase coil is energized; 10. A stator according to claim 9, wherein the opening is located between the A-phase pole set and the B-phase pole set.

5. An electric valve having the stator according to claim 1, claim 2 or claim 4 and a valve body assembly, The valve body assembly is a valve body having a cylindrical shape and disposed in the internal space; a magnet rotor disposed inside the valve body and constituting a motor together with the stator; A motor-operated valve, characterized in that a pipe is connected to one end and the other end of the valve body.

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