Detection structure, rotor assembly, motor and compressor

Abstract

The utility model provides a detection structure, a rotor assembly, a motor and a compressor. The detection structure comprises an iron core structure which sleeves the rotating member and is arranged at an interval with the rotating member; the iron core structure comprises an annular part and at least two lug bosses, and the at least two lug bosses are arranged at the inner ring of the annular part at intervals around the periphery of the inner ring of the annular part; the at least two induction coils and the at least two protruding parts are arranged in a one-to-one correspondence mode, and each induction coil is wound around the corresponding protruding part; the magnetic steel is positioned on the inner ring of the iron core structure and is spaced from the iron core structure; the magnetic steel is arranged on the outer edge of the rotating piece and connected with the rotating piece so that induced electromotive force can be generated in the at least two induction coils in the process that the rotating piece drives the magnetic steel to rotate. According to the technical scheme provided by the utility model, the technical problem that the rotor position detection structure in the prior art cannot detect the rotation direction of the rotor in real time can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of detection structures, and in particular to a detection structure, a rotor assembly, a motor and a compressor. Background Art

[0002] At present, in order to estimate the rotation speed, direction and rotor position of the motor rotor, a sensorless rotor control technical solution is usually used in the prior art to detect the motor rotor position.

[0003] However, in the existing sensorless rotor control technology, there are problems such as poor rotor position sensing accuracy, high system complexity, and high cost of related controller systems. In addition, the existing control schemes do not take into account the detection of rotor rotation, and the detection accuracy of rotor position is not high. For motors suitable for compressors, the existing schemes are also less integrated with the compressor, resulting in a large degree of space occupation. Utility Model Content

[0004] The main purpose of the utility model is to provide a detection structure, a rotor assembly, a motor and a compressor to solve the technical problem that the rotor position detection structure in the prior art cannot detect the rotor rotation direction in real time.

[0005] In order to achieve the above object, according to a first aspect of the utility model, a detection structure is provided, comprising:

[0006] The core structure is sleeved on the rotating member and spaced apart from the rotating member; the core structure comprises an annular portion and at least two protrusions, and the at least two protrusions are spaced apart around the periphery of the inner ring of the annular portion and arranged at the inner ring of the annular portion;

[0007] At least two induction coils, the at least two induction coils are arranged in one-to-one correspondence with the at least two protrusions, and each induction coil is wound around the corresponding protrusion;

[0008] The magnetic steel is located in the inner circle of the iron core structure and is spaced apart from the iron core structure; the magnetic steel is arranged at the outer edge of the rotating member and is connected to the rotating member, so that an induced electromotive force is generated in at least two induction coils during the process of the rotating member driving the magnetic steel to rotate.

[0009] Furthermore, there are multiple protrusions, which are arranged at intervals along the circumference of the inner ring of the annular portion; the number of the protrusions is N 1 ;

[0010] Among them, N 1 =4n, n is a natural number; and / or,

[0011] N 1 ≤20; and / or,

[0012] The plurality of protrusions are evenly arranged along the circumference of the inner ring of the annular portion.

[0013] Furthermore, the detection structure also includes:

[0014] The energy coil is wound on the raised part and spaced apart from the induction coil. When the rotating part stops rotating, the energy coil is energized by an external power source, and the induction coil generates an induced current under the action of the energy coil.

[0015] Further, the number of turns of the induction coil is greater than or equal to the number of turns of the energy coil; and / or,

[0016] Along the protruding extension direction of the protruding portion, the induction coil and the energy coil are arranged on the same protruding portion with a spacing.

[0017] Furthermore, there are at least two magnetic steels, and the number of the magnetic steels is N. 2 ;

[0018] Among them, N 2 =4n, n is a natural number; and / or,

[0019] N 2 ≤20; and / or,

[0020] N 2 =N 1 , N 1 is the number of protrusions.

[0021] Further, there are at least two magnetic steels, a part of the at least two magnetic steels forms a first magnetic steel part, another part of the at least two magnetic steels forms a second magnetic steel part, and the first magnetic steel part and the second magnetic steel part are spaced and / or arranged opposite to each other;

[0022] Wherein, the first magnetic steel portion and the second magnetic steel portion each include one magnetic steel; or,

[0023] The first magnetic steel portion and the second magnetic steel portion each include at least two spliced ​​magnetic steels.

[0024] Further, a heat dissipation coating is provided on the outer surface of the annular portion and / or the outer surface of the raised portion; and / or,

[0025] A heat dissipation layer is arranged between the magnetic steel and the rotating part.

[0026] Furthermore, the detection structure also includes a protective sleeve, which is sleeved on the magnetic steel;

[0027] Wherein, the protective sleeve and the magnetic steel are in interference fit; and / or,

[0028] A heat dissipation coating is arranged on the outer surface of the protective cover.

[0029] According to a second aspect of the utility model, a rotor assembly is provided, comprising:

[0030] The detection structure provided above;

[0031] A thrust plate forms a rotating part.

[0032] Furthermore, the rotor assembly further comprises a shaft core, the thrust disc is sleeved on the shaft core, and the thrust disc is rotatably arranged relative to the shaft core;

[0033] Wherein, the thrust plate is eccentrically arranged with respect to the shaft core; and / or,

[0034] S 1 ≥3S 2 , where S 1 is the surface area of ​​the thrust plate, S 2 is the surface area of ​​the core; and / or,

[0035] 0mm<d≤5mm, where d is the distance between the center of the thrust plate and the center of the shaft core.

[0036] According to a third aspect of the utility model, a motor is provided, comprising: the rotor assembly provided above.

[0037] According to a fourth aspect of the utility model, a compressor is provided, comprising: the motor provided above.

[0038] By applying the technical solution of the utility model, a magnetic steel can be arranged at the outer edge of the rotating part, and an iron core structure can be sleeved on the outer side of the magnetic steel, so that a corresponding induced electromotive force is generated in the induction coil arranged on the iron core structure according to the change in the distance between the magnetic steel and the iron core structure during the rotation process. Since there are at least two induction coils, during the rotation of the magnetic steel, different induced electromotive forces can be generated in the at least two induction coils due to the different changes in the distance between the magnetic steel and the at least two induction coils, so that the rotation direction of the magnetic steel can be integrated and judged, and then the rotation direction of the rotating part can be judged. Such a setting makes the integration between the detection structure and the structure to be detected higher, and the detection structure occupies less space, while ensuring better detection accuracy. Therefore, the technical problem that the rotor position detection structure in the prior art cannot detect the rotor direction in real time can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0040] Figure 1A schematic diagram of the topological structure of the detection structure provided according to the first embodiment of the present utility model is shown;

[0041] Figure 2 A partial structural schematic diagram of a detection structure provided according to the first embodiment of the utility model is shown;

[0042] Figure 3 The figure shows the waveform of the induced electromotive force generated in the first induction coil according to the first embodiment of the present utility model;

[0043] Figure 4 The waveform diagram of the induced electromotive force generated in the second induction coil provided in the first embodiment of the utility model is shown;

[0044] Figure 5 The induced electromotive force waveform diagram generated by the induction coil in different quadrants according to the first embodiment of the utility model is shown;

[0045] Figure 6 The waveform diagram of the induced electromotive force generated by the induction coil and the energy coil under different distances between the magnetic steel and the iron core structure provided in the first embodiment of the utility model is shown;

[0046] Figure 7 A schematic structural diagram of a motor provided according to Embodiment 3 of the present utility model is shown.

[0047] The above drawings include the following reference numerals:

[0048] 10. Core structure;

[0049] 11. Ring part;

[0050] 12. Raised part;

[0051] 20. induction coil; 21. first induction coil; 22. second induction coil;

[0052] 30, magnetic steel; 31, first magnetic steel; 32, second magnetic steel; 33, third magnetic steel; 34, fourth magnetic steel;

[0053] 40. Energy coil;

[0054] 51. The first magnetic steel portion;

[0055] 52. The second magnetic steel portion;

[0056] 60. Protective cover;

[0057] 1. Thrust plate;

[0058] 2. Axis core. DETAILED DESCRIPTION

[0059] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0060] like Figures 1 to 6 As shown, the first embodiment of the utility model provides a detection structure, which includes an iron core structure 10, at least two induction coils 20 and a magnetic steel 30. The iron core structure 10 is sleeved on the rotating member and is spaced apart from the rotating member; the iron core structure 10 includes an annular portion 11 and at least two protrusions 12, and the at least two protrusions 12 are spaced apart at the inner circle of the annular portion 11 around the periphery of the inner circle of the annular portion 11. At least two induction coils 20 are arranged one-to-one correspondingly to the at least two protrusions 12, and each induction coil 20 is wound on the corresponding protrusion 12. The magnetic steel 30 is located in the inner circle of the iron core structure 10 and is spaced apart from the iron core structure 10; the magnetic steel 30 is arranged at the outer edge of the rotating member and is connected to the rotating member, so that when the rotating member drives the magnetic steel 30 to rotate, an induced electromotive force is generated in the at least two induction coils 20.

[0061] By adopting the detection structure provided in the first embodiment of the utility model, a magnetic steel 30 can be arranged at the outer edge of the rotating part, and an iron core structure 10 can be sleeved outside the magnetic steel 30, so that a corresponding induced electromotive force is generated in the induction coil 20 arranged on the iron core structure 10 according to the change in the distance between the magnetic steel 30 and the iron core structure 10 during the rotation process. Since there are at least two induction coils 20, during the rotation of the magnetic steel 30, due to the different changes in the distance between the magnetic steel 30 and the at least two induction coils 20, different induced electromotive forces can be generated in the at least two induction coils 20 respectively, so that the rotation direction of the magnetic steel 30 can be integrated and judged, and then the rotation direction of the rotating part can be judged. Such a setting makes the integration between the detection structure and the structure to be detected higher, the detection structure occupies less space, and at the same time ensures better detection accuracy. Therefore, the detection structure provided in this embodiment can solve the technical problem that the rotor position detection structure in the prior art cannot detect the rotor rotation in real time.

[0062] Specifically, in order to enhance the compactness of the structure, at least two protrusions 12 and the annular portion 11 are connected to each other.

[0063] Specifically, there are multiple protrusions 12, and the multiple protrusions 12 are arranged at intervals along the circumference of the inner ring of the annular portion 11; the number of the protrusions 12 is N 1 Among them, N 1=4n, n is a natural number. With such a structural setting, the detection accuracy can be enhanced by setting a plurality of protrusions 12 in combination with the setting of the induction coils 20 corresponding to the protrusions 12. Since high-speed motors are mostly set with one pair of poles or two pairs of poles, the number of protrusions 12 is a natural integer multiple of 4, which can reduce the problem of component heating and rotor vibration caused by harmonics. The larger n is, the more accurate the position detection of the rotating part is.

[0064] Specifically, there are multiple protrusions 12, and the multiple protrusions 12 are arranged at intervals along the circumference of the inner ring of the annular portion 11; the number of the protrusions 12 is N 1 Among them, N 1 ≤20. Such a structural setting can avoid the difficulty of the manufacturing process caused by too many protrusions 12 or the excessive volume of the core structure 10, thereby controlling the upper limit of the production cost and reducing the occupied space of the detection structure.

[0065] Specifically, there are multiple protrusions 12, and the multiple protrusions 12 are arranged at intervals along the circumference of the inner ring of the annular portion 11; the number of the protrusions 12 is N 1 Among them, a plurality of protrusions 12 are evenly arranged along the periphery of the inner circle of the annular portion 11. With such a structural arrangement, it is convenient to integrate and judge the induced electromotive force generated in the induction coil 20 corresponding to each protrusion 12, thereby improving the detection efficiency.

[0066] Specifically, the central angle of the circle corresponding to the interval between two adjacent protrusions 12 is α, α=360° / N 1 Such a structural arrangement can facilitate integrated judgment of the induced electromotive force generated in the induction coil 20 corresponding to each protrusion 12, thereby improving detection efficiency.

[0067] Specifically, Figure 1 and Figure 5 As shown, the core structure 10 in the figure includes four protrusions 12, two of the four protrusions 12 are arranged oppositely, and the other two of the four protrusions 12 are arranged oppositely, and the central angle corresponding to the interval range between the four protrusions 12 is 90°. The four protrusions 12 correspond to the 0° and 360° positions, 90° positions, 180° positions and 270° positions in a circle respectively. Among them, the position between 0° and 360° and the position between 90° is quadrant I, the position between 90° and the position between 180° is quadrant II, the position between 180° and the position between 270° is quadrant III, and the position between 270° and the position between 0° and 360° is quadrant IV. With such a structural setting, it is convenient to integrate and judge the induced electromotive force generated in the induction coil 20 corresponding to each protrusion 12, and further improve the detection efficiency.

[0068] Specifically, in order to further enhance the detection accuracy of the rotating part position, as Figure 1 As shown, when the core structure 10 includes eight protrusions 12, the eight protrusions 12 are respectively arranged at the positions of the four protrusions 12 drawn by solid lines in the figure and the four protrusions 12 drawn by dotted lines in the figure. The central angle corresponding to the interval range between the eight protrusions 12 is 45°.

[0069] In this embodiment, the detection structure further includes an energy coil 40, which is wound on the protrusion 12 and spaced apart from the induction coil 20; when the rotating member stops rotating, the energy coil 40 is energized by the external power supply, and the induction coil 20 generates an induced current under the action of the energy coil 40. With such a structural setting, the induction current can be generated in the induction coil 20 through the setting of the energy coil 40, and then it can be judged whether the induction coil is normal according to the waveform of the induced current generated in the induction coil 20. Specifically, the power supply is an AC power supply.

[0070] Specifically, the detection structure also includes a detection module, a comparison module and a judgment module. The detection module is used to detect the induced current. The comparison module is used to compare the current value corresponding to the induced current with the preset current value. The judgment module is used to judge that the induction coil 20 is normal when the current value is equal to the preset current value; when the current value is different from the preset current value, the judgment module judges that the induction coil 20 is abnormal. With such a structural setting, the induced current can be generated in the induction coil 20 through the setting of the energy coil 40, and then the detection module, the comparison module and the judgment module can be set to judge whether the induction coil is normal according to the relationship between the current value corresponding to the waveform of the induced current generated in the induction coil 20 and the preset current value. Specifically, the preset current value refers to the induced current value generated by the normal induction coil 20 under the action of the energy coil 40.

[0071] Specifically, the number of turns of the induction coil 20 is greater than or equal to the number of turns of the energy coil 40. In this way, it can be ensured that the induced current generated in the induction coil 20 is not too small to be difficult to record.

[0072] Preferably, the number of turns of the induction coil 20 is equal to the number of turns of the energy coil 40. In this way, the manufacturing difficulty and cost can be reduced while ensuring the accuracy of detection.

[0073] Specifically, along the protrusion extension direction of the protrusion 12, the induction coil 20 and the energy coil 40 are arranged on the same protrusion 12 at intervals. With such a structural arrangement, the energy coil 40 can be arranged to generate an induced current in the induction coil 20, and then it can be determined whether the induction coil is normal according to the waveform of the induced current generated in the induction coil 20.

[0074] Specifically, at least two energy coils 40 are arranged in one-to-one correspondence with at least two protrusions 12; the induction coil 20 is located on the side of the corresponding energy coil 40 away from the annular portion 11; or, the induction coil 20 is located on the side of the corresponding energy coil 40 close to the annular portion 11. With such a structural arrangement, the energy coil 40 can be arranged to generate an induced current in the induction coil 20, and then it can be determined whether the induction coil is normal according to the waveform of the induced current generated in the induction coil 20.

[0075] Specifically, Figure 1 , Figure 3 and Figure 4 As shown, the induction coil 20 includes a first induction coil 21 and a second induction coil 22, and the first induction coil 21 and the second induction coil 22 are staggered. Figure 3 and Figure 4 As shown, Figure 3 and Figure 4 The waveform diagram in FIG. 1 is a waveform diagram of the electromotive force generated by the first induction coil 21 and the second induction coil 22 respectively in the same time. On this basis, the rotation direction of the magnetic steel 30 can be integrated and judged, and then the rotation direction of the rotating part can be detected.

[0076] In this embodiment, there are at least two magnetic steels 30, and the number of the magnetic steels 30 is N. 2 Among them, N 2 =4n, n is a natural number. With such a structural setting, the detection accuracy can be enhanced by setting a plurality of magnetic steels 30. Since high-speed motors are mostly set with one pair of poles or two pairs of poles, the number of magnetic steels 30 is a natural integer multiple of 4, which can reduce the problem of component heating and rotor vibration caused by harmonics. The larger n is, the more accurate the position detection of the rotating part is.

[0077] In this embodiment, there are at least two magnetic steels 30, and the number of the magnetic steels 30 is N. 2 Among them, N 2 ≤20. With such a structural setting, it is possible to avoid the difficulty of the manufacturing process caused by an excessive number of magnetic steels 30, thereby controlling the upper limit of the production cost and reducing the occupied space of the detection structure.

[0078] In this embodiment, there are at least two magnetic steels 30, and the number of the magnetic steels 30 is N. 2 Among them, N 2 =N 1 , N 1 is the number of the protrusions 12. With such a structural arrangement, the number of the magnetic steels 30 is consistent with the number of the protrusions 12, which can reduce the manufacturing process and production cost while ensuring the detection accuracy.

[0079] Specifically, the magnetic steel 30 is in the shape of a ring with a corresponding central angle β, where 0°<β<360°.

[0080] Specifically, in order to provide better detection accuracy while controlling costs, there are at least two magnetic steels 30, a part of the at least two magnetic steels 30 forms a first magnetic steel part 51, and another part of the at least two magnetic steels 30 forms a second magnetic steel part 52, and the first magnetic steel part 51 and the second magnetic steel part 52 are spaced and / or arranged relative to each other. Among them, the first magnetic steel part 51 and the second magnetic steel part 52 each include one magnetic steel 30; or, the first magnetic steel part 51 and the second magnetic steel part 52 each include at least two spliced ​​magnetic steels 30. With such a structural arrangement, the magnitude and phase of the induced electromotive force generated by the first magnetic steel part 51 and the second magnetic steel part 52 in the same induction coil 20 at the same time can be different, so that the rotor position can be judged according to the difference in magnitude and phase.

[0081] Specifically, the magnetic steel 30 includes a first magnetic steel 31, a second magnetic steel 32, a third magnetic steel 33 and a fourth magnetic steel 34. The first magnetic steel 31 and the second magnetic steel 32 are spliced, the third magnetic steel 33 and the fourth magnetic steel 34 are spliced, the first magnetic steel 31 and the fourth magnetic steel 34 are arranged opposite to each other, and the second magnetic steel 32 and the third magnetic steel 33 are arranged opposite to each other. With such a structural arrangement, the magnitude and phase of the induced electromotive force generated by the magnetic steel portion formed by the first magnetic steel 31 and the second magnetic steel 32 and the magnetic steel portion formed by the third magnetic steel 33 and the fourth magnetic steel 34 in the same induction coil 20 at the same time can be different, so that the rotor position can be accurately determined according to the difference in magnitude and phase.

[0082] Specifically, a heat dissipation coating is provided on the outer surface of the annular portion 11 and / or the outer surface of the raised portion 12. Specifically, the outer surface of the annular portion 11 refers to the entire outer surface of the annular portion 11. The outer surface of the raised portion 12 refers to the entire outer surface of the raised portion 12. With such a structural arrangement, the heat dissipation capacity of the core structure 10 can be enhanced, the temperature during the detection process can be reduced, and the service life of the core structure 10 can be extended.

[0083] Specifically, a heat dissipation layer is provided between the magnetic steel 30 and the rotating member. With such a structural arrangement, the heat dissipation capacity of the detection structure can be enhanced, the temperature during the detection process can be reduced, and thus the service life of the magnetic steel 30 can be extended.

[0084] Specifically, the heat dissipation layer is epoxy resin. With such a structural setting, the heat dissipation capacity of the detection structure can be enhanced, the temperature during the detection process can be reduced, and thus the service life of the magnetic steel 30 can be extended.

[0085] In this embodiment, the detection structure further includes a protective cover 60, which is sleeved on the magnetic steel 30. The protective cover 60 and the magnetic steel 30 are interference fit. With such a structural setting, the protective cover 60 can protect the magnetic steel 30, preventing the magnetic steel 30 from falling off and flying out due to the large centrifugal force when rotating at high speed, thereby extending the service life of the magnetic steel 30.

[0086] In this embodiment, the detection structure further includes a protective cover 60, which is sleeved on the magnetic steel 30. A heat dissipation coating is provided on the outer surface of the protective cover 60. With such a structural setting, the heat dissipation capacity of the protective cover 60 can be enhanced, and the temperature of the protective cover 60 during the detection process can be reduced, thereby extending the service life of the protective cover 60.

[0087] Specifically, the thickness of the heat dissipation coating is greater than or equal to 0.002 mm and less than or equal to 0.06 mm. Specifically, the heat dissipation coating is graphene or epoxy resin. With such a structural setting, the heat dissipation capacity of the structure provided with the heat dissipation coating can be enhanced, the temperature during the detection process can be reduced, and thus the service life of the detection structure can be extended.

[0088] Specifically, the formation method of the heat dissipation coating includes PVD (physical vapor deposition), spray coating, dip coating, brush coating, and the like.

[0089] Specifically, the yield strength of the protective cover 60 is greater than or equal to 1100 MPa, and the hardness of the protective cover 60 is greater than or equal to 55 HRC. In this way, the magnetic steel 30 can be better protected.

[0090] Specifically, in order to detect the normal operation of the structure, the core structure 10 is made of a magnetic conductive material, the yield strength of the magnetic conductive material is greater than or equal to 780 MPa, and the tensile strength of the magnetic steel 30 is greater than or equal to 90 MPa.

[0091] The second embodiment of the present utility model provides a rotor assembly, which includes the detection structure in the first embodiment and a thrust plate 1, wherein the thrust plate 1 forms a rotating part.

[0092] The rotor assembly provided by the second embodiment of the utility model can be provided with a magnetic steel 30 at the outer edge of the thrust plate 1, and an iron core structure 10 can be sleeved outside the magnetic steel 30, so that a corresponding induced electromotive force is generated in the induction coil 20 provided on the iron core structure 10 according to the change in the distance between the magnetic steel 30 and the iron core structure 10 during the rotation process. Since there are at least two induction coils 20, during the rotation of the magnetic steel 30, due to the different changes in the distance between the magnetic steel 30 and the at least two induction coils 20, different induced electromotive forces can be generated in the at least two induction coils 20 respectively, so that the rotation direction of the magnetic steel 30 can be integrated and judged, and then the rotation direction of the thrust plate 1 can be judged. Such a setting makes the integration between the detection structure and the structure to be detected higher, the detection structure occupies less space, and at the same time ensures better detection accuracy. Therefore, the rotor assembly provided by this embodiment can solve the technical problem that the rotor position detection structure in the prior art cannot detect the rotor direction in real time.

[0093] Specifically, the rotor assembly also includes a shaft core 2, and the thrust plate 1 is sleeved on the shaft core 2, and the shaft core 2 is used to drive the thrust plate 1 to rotate; wherein the thrust plate 1 and the shaft core 2 are eccentrically arranged. Specifically, the thrust plate 1, the magnetic steel 30 and the protective cover 60 are concentrically arranged. With such a structural arrangement, the distance between the thrust plate 1 and the core structure 10 can be changed when the thrust plate 1 rotates, so as to facilitate better detection of the rotation direction of the thrust plate 1.

[0094] Specifically, the rotor assembly also includes a shaft core 2, and the thrust disk 1 is sleeved on the shaft core 2, and the shaft core 2 is used to drive the thrust disk 1 to rotate; wherein, S 1 ≥3S 2 , where S 1 is the surface area of ​​the thrust plate 1, S 2 is the surface area of ​​the shaft core 2. Such a structural setting is adopted because if the surface area of ​​the shaft core 2 is too small, the rotor stiffness will be reduced, and if it is too large, the rotor vibration will increase at high speed. Such a setting can reduce the vibration of the motor at high speed.

[0095] Specifically, the rotor assembly also includes a shaft core 2, and the thrust disk 1 is sleeved on the shaft core 2, and the shaft core 2 is used to drive the thrust disk 1 to rotate; wherein 0mm<d≤5mm, wherein d is the distance between the center of the thrust disk 1 and the center of the shaft core 2. With such a structural setting, the stability of the high speed of the rotor and the sensitivity of the detection signal can be ensured at the same time.

[0096] Specifically, in order to prevent the thrust plate 1 from coming out relative to the shaft core 2 , an interference fit is formed between the thrust plate 1 and the shaft core 2 .

[0097] Specifically, for the normal operation of the rotor assembly, the thrust plate 1 and the shaft core 2 are both made of magnetic conductive materials, and the yield strength of the magnetic conductive materials is greater than or equal to 780 MPa.

[0098] like Figure 7 As shown, the third embodiment of the utility model provides a motor, and the motor includes the rotor assembly in the second embodiment. The motor provided by the third embodiment of the utility model can be provided by arranging a magnetic steel 30 at the outer edge of the thrust plate 1, and sleeved with an iron core structure 10 outside the magnetic steel 30, and then according to the change in the distance between the magnetic steel 30 and the iron core structure 10 during the rotation process, a corresponding induced electromotive force is generated in the induction coil 20 provided on the iron core structure 10. Since there are at least two induction coils 20, during the rotation of the magnetic steel 30, due to the different changes in the distance between the magnetic steel 30 and the at least two induction coils 20, different induced electromotive forces can be generated in the at least two induction coils 20, so that the rotation direction of the magnetic steel 30 can be integrated and judged, and then the rotation direction of the thrust plate 1 can be judged. Such a setting makes the integration between the detection structure and the structure to be detected higher, the detection structure occupies less space, and at the same time ensures better detection accuracy. Therefore, the motor provided by this embodiment can solve the technical problem that the rotor position detection structure in the prior art cannot detect the rotor direction in real time.

[0099] The fourth embodiment of the utility model provides a compressor, and the compressor includes the motor in the third embodiment. The compressor provided by the fourth embodiment of the utility model can be provided with a magnetic steel 30 at the outer edge of the thrust plate 1, and the core structure 10 is sleeved outside the magnetic steel 30, so that the corresponding induced electromotive force is generated in the induction coil 20 provided on the core structure 10 according to the change in the distance between the magnetic steel 30 and the core structure 10 during the rotation process. Since there are at least two induction coils 20, during the rotation of the magnetic steel 30, due to the different changes in the distance between the magnetic steel 30 and the at least two induction coils 20, different induced electromotive forces can be generated in the at least two induction coils 20, so that the rotation direction of the magnetic steel 30 can be integrated and judged, and then the rotation direction of the thrust plate 1 can be judged. Such a setting makes the integration between the detection structure and the structure to be detected higher, the detection structure occupies less space, and at the same time ensures better detection accuracy. Therefore, the compressor provided by this embodiment can solve the technical problem that the rotor position detection structure in the prior art cannot detect the rotor rotation in real time.

[0100] Specifically, the compressor may be a magnetic levitation compressor, a cyclonic floating compressor or a bearingless compressor.

[0101] Specifically, when the compressor is operating normally, AC is supplied to the energy coil 40. At this time, the rotor rotates, and because the running profile is an ellipse (i.e., the air gap between the rotor and the iron core structure 10 of the detection structure is uneven), the magnetic steel 30 on the rotor passes through the induction coil 20, generating an induced electromotive force on the induction coil 20. Figure 6 As shown, Figure 6The waveform in the upper middle part is the induced voltage generated in the induction coil 20. Figure 6 The waveform in the lower middle part is the AC voltage flowing into the energy coil 40. Figure 6 The figure in the middle is a schematic diagram of the distance between the magnetic steel 30 and the core structure 10. From the vertex of the triangle to the direction of the base of the triangle corresponding to the vertex, the distance between the magnetic steel 30 and the core structure 10 becomes larger and larger, and correspondingly, the induced voltage generated in the induction coil 20 becomes smaller and smaller. In this way, when the distance between the magnetic steel 30 and the core structure 10 is closer, the induced electromotive force in the induction coil 20 of the corresponding angle becomes larger, and the amplitude of the induced electromotive force in the induction coil 20 also increases accordingly. Conversely, when the distance between the magnetic steel 30 and the core structure 10 is farther, the induced electromotive force in the induction coil 20 of the corresponding angle becomes smaller, and the amplitude of the induced electromotive force in the induction coil 20 also decreases accordingly. Finally, the amplitude and frequency of the voltage waveforms of different induction coils 20 can be integrated by the controller to determine the rotor rotation direction, angle and speed.

[0102] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0103] (1) The structure of this scheme can sense the rotor position, speed and direction in real time;

[0104] (2) This solution has a high degree of structural integration and does not need to occupy the volume of a compressor alone;

[0105] (3) This solution has high structural accuracy, simple system, high reliability and low cost.

[0106] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0107] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0108] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0109] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0110] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0111] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A detection structure, characterized in that: include: An iron core structure (10) is sleeved on a rotating member and spaced apart from the rotating member; the iron core structure (10) comprises an annular portion (11) and at least two protrusions (12); the at least two protrusions (12) are spaced apart around the circumference of the inner ring of the annular portion (11) and are spaced apart on the inner ring of the annular portion (11); at least two induction coils (20), the at least two induction coils (20) being arranged in one-to-one correspondence with the at least two protrusions (12), and each of the induction coils (20) being wound around the corresponding protrusion (12); The magnetic steel (30) is located in the inner ring of the iron core structure (10) and is spaced apart from the iron core structure (10); the magnetic steel (30) is arranged at the outer edge of the rotating member and is connected to the rotating member, so that when the rotating member drives the magnetic steel (30) to rotate, an induced electromotive force is generated in at least two of the induction coils (20).

2. The detection structure according to claim 1, characterized in that: There are a plurality of protrusions (12), and the plurality of protrusions (12) are arranged at intervals along the circumference of the inner ring of the annular portion (11); the number of the protrusions (12) is N1; Wherein, N1=4n, n is a natural number; and / or, N1≤20; and / or, The plurality of raised portions (12) are evenly arranged along the periphery of the inner ring of the annular portion (11).

3. The detection structure according to claim 1, characterized in that: The detection structure also includes: An energy coil (40) is wound around the protruding portion (12) and spaced apart from the induction coil (20); when the rotating member stops rotating, the energy coil (40) is energized by an external power source, and the induction coil (20) generates an induced current under the action of the energy coil (40).

4. The detection structure according to claim 3, characterized in that: The number of turns of the induction coil (20) is greater than or equal to the number of turns of the energy coil (40); and / or, Along the protruding extension direction of the protruding portion (12), the induction coil (20) and the energy coil (40) are arranged on the same protruding portion (12) at intervals.

5. The detection structure according to claim 1, characterized in that: There are at least two magnetic steels (30), and the number of the magnetic steels (30) is N2; Wherein, N2=4n, n is a natural number; and / or, N2≤20; and / or, N2=N1, N1 is the number of the protrusions (12).

6. The detection structure according to claim 1, characterized in that: There are at least two magnetic steels (30), a portion of at least two of the magnetic steels (30) forms a first magnetic steel portion (51), and another portion of at least two of the magnetic steels (30) forms a second magnetic steel portion (52), and the first magnetic steel portion (51) and the second magnetic steel portion (52) are spaced apart and / or arranged opposite to each other; Wherein, the first magnetic steel portion (51) and the second magnetic steel portion (52) each include one magnetic steel (30); or, The first magnetic steel portion (51) and the second magnetic steel portion (52) each include at least two spliced ​​magnetic steels (30).

7. The detection structure according to claim 1, characterized in that: A heat dissipation coating is provided on the outer surface of the annular portion (11) and / or on the outer surface of the raised portion (12); and / or, A heat dissipation layer is provided between the magnetic steel (30) and the rotating member.

8. The detection structure according to claim 1, characterized in that: The detection structure further comprises a protective cover (60), wherein the protective cover (60) is sleeved on the magnetic steel (30); Wherein, the protective cover (60) and the magnetic steel (30) are in interference fit; and / or, A heat dissipation coating is provided on the outer surface of the protective cover (60).

9. A rotor assembly, characterized in that: include: The detection structure according to any one of claims 1 to 8; A thrust plate (1) is provided, wherein the thrust plate (1) forms a rotating member.

10. The rotor assembly according to claim 9, characterized in that The rotor assembly further comprises a shaft core (2), the thrust plate (1) being sleeved on the shaft core (2), and the thrust plate (1) being rotatably arranged relative to the shaft core (2); Wherein, the thrust plate (1) and the shaft core (2) are eccentrically arranged; and / or, S1≥3S2, wherein S1 is the surface area of ​​the thrust plate (1), and S2 is the surface area of ​​the shaft core (2); and / or, 0mm<d≤5mm, wherein d is the distance between the center of the thrust plate (1) and the center of the shaft core (2).

11. A motor, characterized in that: include: A rotor assembly as claimed in claim 9 or 10.

12. A compressor, characterized in that: include: The motor as claimed in claim 11.

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