Motor and control valve

Abstract

The application discloses a motor and a control valve, and relates to the technical field of motors.The motor comprises a pole plate assembly, the pole plate assembly is formed in a ring shape and internally defines a winding space, the inner side of the ring shape of the pole plate assembly is formed as a stator hole; a winding is arranged in the winding space; and a rotor is rotatably arranged in the stator hole, and the magnetic resistance remains unchanged during rotation of the rotor.According to the motor, the pole plate assembly is formed in a ring shape and internally defines a winding space, the inner side of the ring shape of the pole plate assembly is formed as a stator hole, the winding is arranged in the winding space, and the rotor is rotatably arranged in the stator hole, and the magnetic resistance remains unchanged during rotation of the rotor, so that the magnetic resistance does not change with the rotation angle of the rotor, the cogging torque of the motor can be weakened, the problem that the rotor rotates after the winding is powered off can be reduced, the control precision of the motor is higher, and the required precision requirement can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, and more particularly, to an electric machine and a control valve. BACKGROUND

[0002] In the related art, when the winding is powered off, the rotor stops at different positions. Due to the existence of the cogging torque, the magnetic resistance at different positions is different. According to the principle of minimum magnetic resistance, the magnetic flux is closed along the path with minimum magnetic resistance, which causes the rotor to stop at a position with large magnetic resistance. The rotor is subjected to the action of electromagnetic force, which causes the rotor to rotate to a position with small magnetic resistance, thereby causing the rotor to rotate after the winding is powered off, so that the electric machine cannot be accurately controlled and cannot meet the required accuracy requirements. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to provide an electric machine capable of weakening the cogging torque, so as to improve the control accuracy and facilitate meeting the required accuracy requirements.

[0004] Another object of the present application is to provide a control valve having the above-mentioned electric machine.

[0005] According to the electric machine of the embodiments of the present application, the pole plate assembly is formed in a ring shape and defines a winding space inside, and the inner side of the ring shape of the pole plate assembly is formed as a stator hole. The winding is arranged in the winding space. The rotor is rotatably arranged in the stator hole. During rotation of the rotor, the magnetic resistance remains unchanged.

[0006] According to the electric machine of the embodiments of the present application, the pole plate assembly is formed in a ring shape and defines a winding space inside, and the inner side of the ring shape of the pole plate assembly is formed as a stator hole. The winding is arranged in the winding space. The rotor is rotatably arranged in the stator hole. During rotation of the rotor, the magnetic resistance remains unchanged. The magnetic resistance does not change with the change of the rotation angle of the rotor, which can weaken the cogging torque of the electric machine, reduce the problem of rotation of the rotor after the winding is powered off, and improve the control accuracy of the electric machine, facilitating meeting the required accuracy requirements.

[0007] In addition, the electric machine according to the above-mentioned embodiments of the present application can also have the following additional technical features:

[0008] According to the electric machine of some embodiments of the present application, the inner peripheral wall of the pole plate assembly is formed with a plurality of pole claws, and the plurality of pole claws define the stator hole.

[0009] According to some embodiments of the present application, the plurality of pole claws are uniformly spaced in the circumferential direction of the winding space.

[0010] According to some embodiments of the present application, the width of the pole claw along the circumferential direction of the wire winding space is constant along the extension direction of the pole claw.

[0011] According to some embodiments of the present application, the pole claw extends along the axial direction of the wire winding space, or the pole claw extends obliquely along the circumferential direction of the wire winding space, or the pole claw comprises a first extension section and a second extension section connected to each other, and the first extension section and the second extension section are at an angle to each other.

[0012] According to some embodiments of the present application, the wire winding space comprises a first wire winding space and a second wire winding space, and the pole plate assembly comprises: a first pole plate group, which is formed in a ring shape and internally defines the first wire winding space, and the inner circumferential wall of the first pole plate group is formed with a plurality of the pole claws; and a second pole plate group, which is spaced apart from the first pole plate group along the axial direction, is formed in a ring shape and internally defines the second wire winding space, and the inner circumferential wall of the second pole plate group is formed with a plurality of the pole claws, and the wire winding is arranged in the first wire winding space and the second wire winding space.

[0013] According to some embodiments of the present application, the plurality of pole claws comprises a first pole claw and a second pole claw, and at least one of the first pole plate group and the second pole plate group comprises: a first sub-pole plate, which is provided with a plurality of the first pole claws; and a second sub-pole plate, which is provided with a plurality of the second pole claws, and the first sub-pole plate and the second sub-pole plate are overlapped with each other and connected to define the first wire winding space or the second wire winding space, and the plurality of first pole claws and the plurality of second pole claws are arranged alternately.

[0014] According to some embodiments of the present application, the gap between any two adjacent pole claws of the first pole plate group is of the same shape as the pole claw of the second pole plate group and has the same width along the circumferential direction of the wire winding space, and the plurality of pole claws of the first pole plate group and the plurality of pole claws of the second pole plate group are arranged alternately along the circumferential direction of the wire winding space.

[0015] According to some embodiments of the present application, along the circumferential direction of the rotor, the total area of the part of the rotor within any angle range opposite to the plurality of pole claws is constant when the rotor rotates.

[0016] The control valve according to the embodiments of the present application comprises the motor according to the embodiments of the present application.

[0017] According to the control valve of the embodiment of the present application, the pole plate assembly is formed in a ring shape and defines a winding space inside, the inner side of the ring shape of the pole plate assembly is formed as a stator hole, the winding is arranged in the winding space, and the rotor is rotatably arranged in the stator hole. During rotation of the rotor, the magnetic resistance remains unchanged, so that the magnetic resistance does not change with the rotation angle of the rotor, the cogging torque of the motor can be weakened, the problem that the rotor rotates after the winding is powered off can be reduced, the control precision of the motor is higher, and the required precision requirement can be met.

[0018] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0020] Figure 1 is a schematic view of a partial structure of a motor according to a first embodiment of the present application;

[0021] Figure 2 is a sectional view of the motor according to the first embodiment of the present application;

[0022] Figure 3 is a schematic view of a structure of a first sub-pole plate of the motor according to the first embodiment of the present application;

[0023] Figure 4 is a schematic view of a structure of a second sub-pole plate of the motor according to the first embodiment of the present application;

[0024] Figure 5 is a schematic view of a partial structure of a motor according to a second embodiment of the present application;

[0025] Figure 6 is a sectional view of the motor according to the second embodiment of the present application;

[0026] Figure 7 is a schematic view of a partial structure of a motor according to a third embodiment of the present application;

[0027] Figure 8 is a sectional view of the motor according to the third embodiment of the present application;

[0028] Figure 9 is a schematic view of a motor according to an embodiment of the present application;

[0029] Figure 10 is a schematic view of a motor according to the related art.

[0030] REFERENCE NUMERALS:

[0031] 100, motor;

[0032] 10, pole plate assembly; 11, winding space; 12, stator hole; 13, pole claw; 111, first winding space; 112, second winding space; 131, first extension section; 132, second extension section;

[0033] 20, winding;

[0034] 31, first pole plate group; 32, second pole plate group; 311, first sub-pole plate; 312, second sub-pole plate; 313, gap;

[0035] 41, first pole claw; 42, second pole claw;

[0036] 50, winding support; 51, mounting cavity;

[0037] 60, connecting piece;

[0038] 70, rotor. DETAILED DESCRIPTION

[0039] Embodiments of the present application are described in detail below with reference to the attached drawings, which show by way of example, embodiments in which like numerals indicate like elements or components, and in which:

[0040] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0041] In the description of the present application, "first feature", "second feature" can include one or more of the features, the meaning of "multiple" is two or more, and "above" or "below" the first feature in the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them, and "above", "over" and "on" the first feature in the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height.

[0042] The motor 100 according to an embodiment of the present application is described below with reference to the accompanying drawings.

[0043] Referring to Figures 1-9 Fig. 1, the motor 100 according to an embodiment of the present application can include a pole plate assembly 10, a winding 20 and a rotor 70. The motor 100 can be a stepper motor or the like.

[0044] Specifically, the pole plate assembly 10 is formed in a ring shape, and a winding space 11 is defined inside the pole plate assembly 10, the winding 20 is arranged in the winding space 11, the placement requirement of the winding 20 can be met, the inner side of the ring shape of the pole plate assembly 10 is formed as a stator hole 12, and the rotor 70 is rotatably arranged in the stator hole 12. Thus, after the winding 20 is energized, the winding 20 and the pole plate assembly 10 jointly generate a magnetic field, so that the rotor 70 starts to rotate under the action of the magnetic field; after the winding 20 is de-energized, the magnetic force generated by the winding 20 and the pole plate assembly 10 disappears, and the rotor 70 stops rotating, so that the use requirement of the motor 100 can be met.

[0045] The inventor of the present application finds that the motor in the related art as shown in Figure 10 Fig. 1, when the winding is de-energized, the rotor stops at different positions, due to the existence of the cogging torque, the magnetic resistance at different positions is different, according to the principle of minimum magnetic resistance, the magnetic flux closes along the path with the minimum magnetic resistance, and the rotor can stop at any position, when the rotor does not stop at the position with the minimum magnetic resistance, due to the influence of the magnetic force on the rotor, the rotor will rotate to the position with the minimum magnetic resistance, thereby causing the rotor to still rotate after the winding is de-energized, and finally stopping at the position with the minimum magnetic resistance, and the rotation of the rotor after the de-energization makes the position of the rotor unable to be accurately controlled, and the control accuracy requirement of the product cannot be met.

[0046] Thus, in the present application, during the rotation of the rotor 70, the magnetic resistance remains unchanged, that is, the magnetic resistance does not change with the rotation angle of the rotor 70, according to the cogging torque derivation formula: wherein, is the cogging torque, is the magnetic flux passing through the air gap, and R is the total magnetic resistance through which the magnetic flux passes, is the angle, since the magnetic resistance R does not change with the rotation angle of the rotor 70, θ the derivative in the above formula is zero, and the cogging torque is also zero, thereby being able to weaken the cogging torque of the motor 100, reduce the problem of the rotation of the rotor 70 after the winding 20 is de-energized, make the control accuracy of the motor 100 higher, facilitate meeting the required accuracy requirement, and since the magnetic flux is squared in the above formula, the cogging torque is independent of the direction of the magnetic flux, and there is no need to control the direction of the magnetic flux. For example, when the motor 100 is a stepper motor, the angular accuracy of the stepping can be improved.

[0047] According to the motor 100 of the embodiment of the present application, the pole plate assembly 10 is formed in a ring shape and defines a winding space 11 inside, the inner side of the ring shape of the pole plate assembly 10 is formed as a stator hole 12, the winding 20 is arranged in the winding space 11, and the rotor 70 is rotatably arranged in the stator hole 12. During rotation of the rotor 70, the magnetic resistance remains unchanged, so that the magnetic resistance does not change with the rotation angle of the rotor 70, the cogging torque of the motor 100 can be weakened, the problem of rotation of the rotor 70 after the winding 20 is powered off can be reduced, the control accuracy of the motor 100 is higher, and the required accuracy requirement can be met.

[0048] In some embodiments of the present application, as shown in Figures 1-8 The inner peripheral wall of the pole plate assembly 10 is formed with a plurality of (equal to or greater than two) pole claws 13, and the plurality of pole claws 13 define the stator hole 12, so that the rotor 70 can rotate in the stator hole 12, and the plurality of pole claws 13 can enhance the magnetic flux and reduce leakage, balance the magnetic resistance, suppress harmonics, and improve the electromagnetic induction efficiency, thereby reducing the running vibration and noise.

[0049] In some embodiments of the present application, as shown in Figures 1-8 The plurality of pole claws 13 are uniformly spaced along the circumferential direction of the winding space 11, the structure of the pole claw 13 of the motor 100 is redesigned, for example, the plurality of pole claws 13 are interpenetrated in the gap 313 and connected to form a complete ring shape, so that the magnetic resistance remains unchanged during rotation of the rotor 70, the cogging torque of the motor 100 can be weakened, the control accuracy of the motor 100 is higher, the required accuracy requirement can be met, and the gap 313 between any two adjacent pole claws 13 can achieve lightweight and improve the heat dissipation effect, thereby prolonging the service life of the motor 100.

[0050] In some embodiments of the present application, as shown in Figures 1-8 Along the extension direction of the pole claw 13, the width of the pole claw 13 along the circumferential direction of the winding space 11 is constant, the structure of the pole claw 13 of the motor 100 is redesigned, for example, the plurality of pole claws 13 are interpenetrated in the gap 313 and connected to form a complete ring shape, so that the magnetic resistance remains unchanged during rotation of the rotor 70, the cogging torque of the motor 100 can be weakened, the control accuracy of the motor 100 is higher, and the required accuracy requirement can be met.

[0051] In the embodiments of the present application, the specific structure of the pole claw 13 can be set according to actual conditions.

[0052] For example, in some embodiments, as shown in Figures 1-4 The pole claw 13 is arranged along the axis direction of the winding space 11 (for example Figure 2The pole claws 13 extend along the up-down direction (as shown in the drawings), so that the structure of the pole claws 13 is simple, the pole claws 13 are easy to manufacture, the production cost can be reduced, and the design requirements of different pole claws 13 can be met.

[0053] It should be noted that, for the convenience of description, the up-down direction and other directions in the present application are based on the orientation relationship shown in the drawings, and are not limited to the orientation in the actual application process.

[0054] Alternatively, as shown in Figure 5 and Figure 6 , the pole claws 13 extend along the circumferential direction of the wire winding space 11, so that the structure of the pole claws 13 is simple, the pole claws 13 are easy to manufacture, the production cost can be reduced, and the design requirements of different pole claws 13 can be met.

[0055] Alternatively, as shown in Figure 7 and Figure 8 , the pole claws 13 include a first extension segment 131 and a second extension segment 132 connected to each other, the first extension segment 131 and the second extension segment 132 are at an angle with each other, and can be set according to actual conditions to meet the design requirements of different pole claws 13.

[0056] According to some embodiments of the present application, as shown in Figures 1-8 , the wire winding space 11 includes a first wire winding space 111 and a second wire winding space 112, the pole plate assembly 10 includes a first pole plate group 31 and a second pole plate group 32, the first pole plate group 31 is formed in a ring shape, and the inside of the first pole plate group 31 defines the first wire winding space 111, the inner circumferential wall of the first pole plate group 31 is formed with a plurality of pole claws 13, the first pole plate group 31 and the second pole plate group 32 are arranged at intervals along the axial direction (for example, the up-down direction as shown in the drawings), the second pole plate group 32 is formed in a ring shape, and the inside of the second pole plate group 32 defines the second wire winding space 112, the inner circumferential wall of the second pole plate group 32 is formed with a plurality of pole claws 13, and the first wire winding space 111 and the second wire winding space 112 are each provided with a winding 20. Figure 2

[0057] Thus, by passing current through the windings 20 in the first wire winding space 111 and the second wire winding space 112 respectively, the control requirements of different rotation directions of the rotor 70 can be realized, so that different use requirements of the motor 100 can be realized, and the structure of the pole plate assembly 10 is simple, easy to manufacture, and conducive to reducing production cost.

[0058] In some embodiments, as shown in Figure 1 , Figure 2 , Figures 5-8 ​As shown, the motor 100 includes four connectors 60, two of which are connected with the windings 20 in the first winding space 111 and extend out of the first pole plate set 31, so that the external structure can be connected with the windings 20 in the first winding space 111 through the connectors 60, facilitating the energization of the windings 20 in the first winding space 111, making the connection more convenient, and the other two of which are connected with the windings 20 in the second winding space 112 and extend out of the second pole plate set 32, so that the external structure can be connected with the windings 20 in the second winding space 112 through the connectors 60, facilitating the energization of the windings 20 in the second winding space 112, making the connection more convenient. For example, the connectors 60 can be PIN needles.

[0059] In some embodiments of the present application, as shown in Figures 1-8 As shown, the plurality of pole claws 13 includes a first pole claw 41 and a second pole claw 42, and at least one of the first pole plate set 31 and the second pole plate set 32 includes a first sub-pole plate 311 and a second sub-pole plate 312, i.e., the first pole plate set 31 includes the first sub-pole plate 311 and the second sub-pole plate 312, or the second pole plate set 32 includes the first sub-pole plate 311 and the second sub-pole plate 312, or both the first pole plate set 31 and the second pole plate set 32 include the first sub-pole plate 311 and the second sub-pole plate 312, which can be set according to actual conditions to meet different setting requirements.

[0060] The first sub-pole plate 311 is provided with a plurality of (greater than or equal to two) first pole claws 41, and the second sub-pole plate 312 is provided with a plurality of (greater than or equal to two) second pole claws 42, the first sub-pole plate 311 and the second sub-pole plate 312 are overlapped with each other and connected, so as to define the first winding space 111 or the second winding space 112, facilitating the placement of the windings 20 and avoiding damage caused by exposure of the windings 20, which is conducive to prolonging the service life. At the same time, the structure of the first pole plate set 31 and / or the second pole plate set 32 is simple, facilitating processing and manufacturing, and being conducive to reducing production costs.

[0061] In addition, as shown in Figure 2 、 Figure 6 and Figure 8 The plurality of first pole claws 41 and the plurality of second pole claws 42 are arranged alternately, so that the first pole plate set 31 or the second pole plate set 32 can interact with the magnetic field of the rotor 70, facilitating the rotation of the rotor 70 and ensuring the stable operation of the motor 100.

[0062] According to some embodiments of the present application, as shown in Figure 2 、 Figure 6 and Figure 8As shown, the gap 313 between any two adjacent claws 13 of the first pole plate set 31 is shaped the same as the claw 13 of the second pole plate set 32, the width of the gap 313 between any two adjacent claws 13 of the first pole plate set 31 is the same as the width of the claw 13 of the second pole plate set 32 along the circumferential direction of the winding space 11, and the plurality of claws 13 of the first pole plate set 31 and the plurality of claws 13 of the second pole plate set 32 are alternately arranged along the circumferential direction of the winding space 11.

[0063] Therefore, when the plurality of claws 13 of the second pole plate set 32 penetrate into the plurality of gaps 313 of the first pole plate set 31, the plurality of claws 13 are connected to each other to form a complete annular shape, that is, the plurality of claws 13 of the first pole plate set 31 and the second pole plate set 32 are connected to each other to form a complete annular shape, and the plurality of claws 13 do not overlap each other, so that the total area of the corresponding claws 13 remains unchanged when the rotor 70 rotates at any angle, thereby ensuring that the magnetic resistance remains unchanged during rotation of the rotor 70, that is, the magnetic resistance does not change with the rotation angle of the rotor 70, which can weaken the cogging torque of the motor 100, reduce the problem of rotation of the rotor 70 after the winding 20 is powered off, and make the control accuracy of the motor 100 higher, thereby facilitating the satisfaction of the required accuracy requirement.

[0064] In some embodiments of the application, the total area of the corresponding claws 13 remains unchanged when the rotor 70 rotates at any angle along the circumferential direction of the rotor 70, for example, the plurality of claws 13 are alternately arranged in the gaps 313 and connected to form a complete annular shape, so that the total area of the corresponding claws 13 remains unchanged when the rotor 70 rotates at any angle along the circumferential direction of the rotor 70, thereby ensuring that the magnetic resistance remains unchanged during rotation of the rotor 70, that is, the magnetic resistance does not change with the rotation angle of the rotor 70, which can weaken the cogging torque of the motor 100, reduce the problem of rotation of the rotor 70 after the winding 20 is powered off, and make the control accuracy of the motor 100 higher, thereby facilitating the satisfaction of the required accuracy requirement.

[0065] In some embodiments in which the pole plate assembly 10 comprises the first pole plate set 31 and the second pole plate set 32, the gap 313 between any two adjacent pole claws 13 of the first pole plate set 31 has the same shape as the pole claws 13 of the second pole plate set 32, the gap 313 between any two adjacent pole claws 13 of the first pole plate set 31 has the same width along the circumferential direction of the wire space 11 as the pole claws 13 of the second pole plate set 32, and the plurality of pole claws 13 of the first pole plate set 31 and the plurality of pole claws 13 of the second pole plate set 32 are arranged alternately along the circumferential direction of the wire space 11. Thus, when the plurality of pole claws 13 of the second pole plate set 32 are inserted into the plurality of gaps 313 of the first pole plate set 31, the plurality of pole claws 13 are connected to each other to form a complete annular shape, so that the total area of the plurality of pole claws 13 of the first pole plate set 31 and the second pole plate set 32 remains unchanged when the rotor 70 rotates through any angle range, thereby ensuring that the magnetic resistance remains unchanged during rotation of the rotor 70, i.e., the magnetic resistance does not change with the rotation angle of the rotor 70, which can weaken the cogging torque of the motor 100, reduce the problem of rotation of the rotor 70 after the winding 20 is de-energized, and make the control accuracy of the motor 100 higher, thereby facilitating meeting the required accuracy requirements.

[0066] In some embodiments in which the pole claws 13 extend along the axial direction of the wire space 11, as shown in FIG. 6, the gap 313 between any two adjacent pole claws 13 of the first pole plate set 31 extends along the axial direction of the wire space 11, so that the gap 313 between any two adjacent pole claws 13 of the first pole plate set 31 has the same shape as the pole claws 13 of the second pole plate set 32. Thus, when the plurality of pole claws 13 of the second pole plate set 32 are inserted into the plurality of gaps 313 of the first pole plate set 31, the plurality of pole claws 13 can be connected to each other to form a complete annular shape, i.e., the plurality of pole claws 13 of the first pole plate set 31 and the second pole plate set 32 are connected to each other to form a complete annular shape, and the plurality of pole claws 13 do not overlap each other, so that the total area of the corresponding pole claws 13 remains unchanged when the rotor 70 rotates through any angle, which can weaken the cogging torque of the motor 100, reduce the problem of rotation of the rotor 70 after the winding 20 is de-energized, make the control accuracy of the motor 100 higher, and facilitate meeting the required accuracy requirements. Figure 2

[0067] In some embodiments in which the pole claws 13 extend along the circumferential direction of the wire space 11, as shown in FIG. 7, the gap 313 between any two adjacent pole claws 13 of the first pole plate set 31 extends along the circumferential direction of the wire space 11, so that the gap 313 between any two adjacent pole claws 13 of the first pole plate set 31 has the same shape as the pole claws 13 of the second pole plate set 32. Thus, when the plurality of pole claws 13 of the second pole plate set 32 are inserted into the plurality of gaps 313 of the first pole plate set 31, the plurality of pole claws 13 can be connected to each other to form a complete annular shape, i.e., the plurality of pole claws 13 of the first pole plate set 31 and the second pole plate set 32 are connected to each other to form a complete annular shape, and the plurality of pole claws 13 do not overlap each other, so that the total area of the corresponding pole claws 13 remains unchanged when the rotor 70 rotates through any angle, which can weaken the cogging torque of the motor 100, reduce the problem of rotation of the rotor 70 after the winding 20 is de-energized, make the control accuracy of the motor 100 higher, and facilitate meeting the required accuracy requirements.

[0067] In some embodiments in which the pole claws 13 extend along the circumferential direction of the wire space 11, as shown in FIG. 7, the gap 313 between any two adjacent pole claws 13 of the first pole plate set 31 extends along the circumferential direction of the wire space 11, so that the gap 313 between any two adjacent pole claws 13 of the first pole plate set 31 has the same shape as the pole claws 13 of the second pole plate set 32. Thus, when the plurality of pole claws 13 of the second pole plate set 32 are inserted into the plurality of gaps 313 of the first pole plate set 31, the plurality of pole claws 13 can be connected to each other to form a complete annular shape, i.e., the plurality of pole claws 13 of the first pole plate set 31 and the second pole plate set 32 are connected to each other to form a complete annular shape, and the plurality of pole claws 13 do not overlap each other, so that the total area of the corresponding pole claws 13 remains unchanged when the rotor 70 rotates through any angle, which can weaken the cogging torque of the motor 100, reduce the problem of rotation of the rotor 70 after the winding 20 is de-energized, make the control accuracy of the motor 100 higher, and facilitate meeting the required accuracy requirements. Figure 6As shown, the gap 313 between any two adjacent claws 13 of the first pole plate set 31 extends obliquely along the circumferential direction of the winding space 11, so that the gap 313 between any two adjacent claws 13 of the first pole plate set 31 is the same in shape as the claws 13 of the second pole plate set 32. Thus, when the plurality of claws 13 of the second pole plate set 32 are inserted into the plurality of gaps 313 of the first pole plate set 31, the plurality of claws 13 can be connected to each other to form a complete annular shape, that is, the plurality of claws 13 of the first pole plate set 31 and the second pole plate set 32 are connected to each other to form a complete annular shape, and the plurality of claws 13 do not overlap each other, so that the total area of the corresponding claws 13 remains unchanged when the rotor 70 rotates at any angle, which can weaken the cogging torque of the motor 100, reduce the problem of rotation of the rotor 70 after the winding 20 is powered off, and make the control precision of the motor 100 higher, facilitating to meet the required precision requirement.

[0068] In some embodiments in which the claw 13 includes the first extension segment 131 and the second extension segment 132 connected to each other and the first extension segment 131 and the second extension segment 132 are at an angle to each other, as shown in Figure 8 As shown, the gap 313 between any two adjacent claws 13 of the first pole plate set 31 extends along the same direction as the first extension segment 131 and the second extension segment 132, so that the gap 313 between any two adjacent claws 13 of the first pole plate set 31 is the same in shape as the claws 13 of the second pole plate set 32. Thus, when the plurality of claws 13 of the second pole plate set 32 are inserted into the plurality of gaps 313 of the first pole plate set 31, the plurality of claws 13 can be connected to each other to form a complete annular shape, that is, the plurality of claws 13 of the first pole plate set 31 and the second pole plate set 32 are connected to each other to form a complete annular shape, and the plurality of claws 13 do not overlap each other, so that the total area of the corresponding claws 13 remains unchanged when the rotor 70 rotates at any angle, which can weaken the cogging torque of the motor 100, reduce the problem of rotation of the rotor 70 after the winding 20 is powered off, and make the control precision of the motor 100 higher, facilitating to meet the required precision requirement.

[0069] In some embodiments of the present application, as shown in Figure 2 , Figure 6 and Figure 8 As shown, the winding space 11 is provided with a winding support 50, and the winding support 50 has a mounting cavity 51. The winding 20 is located in the mounting cavity 51, so that the winding 20 is spaced apart from the pole plate assembly 10, which can realize insulation between the winding 20 and the pole plate assembly 10, avoid short circuit between the winding 20 and the pole plate assembly 10 to cause safety hazards and other problems, and reduce the transmission of vibration, which is conducive to prolonging the service life.

[0070] In some embodiments in which the winding space 11 includes the first winding space 111 and the second winding space 112, as shown inFigure 2 、 Figure 6 With Figure 8 As shown in the drawings, the first winding space 111 and the second winding space 112 are both provided with winding supports 50, and the windings 20 in the first winding space 111 and the windings 20 in the second winding space 112 are respectively located in the installation cavities 51 of the two winding supports 50, so that the insulation requirements of the first polar plate group 31 and the second polar plate group 32 and the windings 20 can be met.

[0071] The control valve according to the embodiment of the application comprises the motor 100 according to the embodiment of the application. Since the motor 100 according to the embodiment of the application has the beneficial technical effects described above, the control valve according to the embodiment of the application, the polar plate assembly 10 is formed in a ring shape and defines a winding space 11 inside, the inner side of the ring shape of the polar plate assembly 10 is formed as a stator hole 12, the windings 20 are arranged in the winding space 11, and the rotor 70 is rotatably arranged in the stator hole 12. During rotation of the rotor 70, the magnetic resistance remains unchanged, so that the magnetic resistance does not change with the rotation angle of the rotor 70. This can weaken the cogging torque of the motor 100, reduce the problem of rotation of the rotor 70 after the windings 20 are powered off, and make the control precision of the motor 100 higher, thereby facilitating meeting the required precision requirements.

[0072] In some embodiments, the control valve can be an electronic expansion valve. The windings 20 are powered by the circuit board, and the windings 20 and the polar plate assembly 10 jointly generate a magnetic field, so that the rotor 70 starts to rotate under the action of the magnetic field. The rotation of the rotor 70 can adjust the opening of the valve port of the electronic expansion valve, so as to control the size of the flow.

[0073] In addition, during rotation of the rotor 70, the magnetic resistance remains unchanged, so that the magnetic resistance does not change with the rotation angle of the rotor 70. This can weaken the cogging torque of the motor 100, reduce the problem of rotation of the rotor 70 after the windings 20 are powered off, and make the control precision of the motor 100 higher, thereby being able to reduce the flow fluctuation of the control valve, improve the consistency of the flow of the control valve, and facilitate improving the stability of the control valve.

[0074] The motor 100 according to the embodiment of the application and other configurations and operations of the control valve are known to those skilled in the art, and will not be described in detail here.

[0075] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0076] In the description of the present specification, the description referring to the terms "embodiment", "specific embodiment", "example", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in an appropriate manner.

[0077] Although the embodiments of the present application have been shown and described, it will be understood by those having ordinary skill in the art that various changes, modifications, alternatives, and variations can be made thereto without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. An electric machine characterized in that, The application relates to a motor, comprising: a polar plate assembly (10) formed in a ring shape and internally defining a winding space (11), an inner side of the ring shape of the polar plate assembly (10) being formed as a stator hole (12), and an inner peripheral wall of the polar plate assembly (10) being formed with a plurality of polar claws (13) defining the stator hole (12); a winding (20) arranged in the winding space (11); a rotor (70) rotatably arranged in the stator hole (12), and a magnetic resistance remaining unchanged during rotation of the rotor (70), wherein the winding space (11) comprises a first winding space (111) and a second winding space (112), the polar plate assembly (10) comprises a first polar plate group (31) and a second polar plate group (32), the first polar plate group (31) is formed in a ring shape and internally defines the first winding space (111), an inner peripheral wall of the first polar plate group (31) is formed with a plurality of the polar claws (13), the first polar plate group (31) and the second polar plate group (32) are arranged in an axial direction, the second polar plate group (32) is formed in a ring shape and internally defines the second winding space (112), an inner peripheral wall of the second polar plate group (32) is formed with a plurality of the polar claws (13), the winding (20) is arranged in the first winding space (111) and the second winding space (112), a gap (313) between any two adjacent polar claws (13) of the first polar plate group (31) is identical in shape to the polar claws (13) of the second polar plate group (32) and in width along a circumferential direction of the winding space (11), and the polar claws (13) of the first polar plate group (31) and the polar claws (13) of the second polar plate group (32) are alternately arranged along the circumferential direction of the winding space (11), the gaps (313) of the first polar plate group (31) and the polar claws (13) of the second polar plate group (32) are one-to-one aligned, and a total area of the polar claws (13) opposite to the rotor (70) in any angle range of the rotor (70) remains unchanged during rotation.

2. The electric machine of claim 1, wherein, The polar claws (13) are uniformly arranged along the circumferential direction of the winding space (11).

3. The electric machine of claim 1, wherein, Along an extension direction of the polar claws (13), the polar claws (13) are constant in width along the circumferential direction of the winding space (11).

4. The electric machine of claim 3, wherein, The polar claws (13) extend along an axial direction of the winding space (11). Or, the polar claws (13) extend along the circumferential direction of the winding space (11) in an inclined manner. Or, the polar claws (13) comprise a first extension segment (131) and a second extension segment (132) connected to each other, and the first extension segment (131) and the second extension segment (132) are at an angle to each other.

5. The electric machine of claim 1, wherein, The polar claws (13) comprise a first polar claw (41) and a second polar claw (42), and at least one of the first polar plate group (31) and the second polar plate group (32) comprises: A first sub-pole plate (311) is provided with a plurality of first pole claws (41); A second sub-pole plate (312) is provided with a plurality of second pole claws (42), and the first sub-pole plate (311) and the second sub-pole plate (312) are overlapped and connected to define the first winding space (111) or the second winding space (112), and the plurality of first pole claws (41) and the plurality of second pole claws (42) are staggered.

6. A control valve characterized by An electric machine (100) according to any one of claims 1-5.

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