Rotor position detection structure and motor with same

Abstract

The utility model provides a rotor position detection structure and a motor having the same, the rotor position detection structure is used for detecting the position of a motor rotor, the rotor position detection structure comprises a first magnetic member, a second magnetic member and a position detection member, the first magnetic member is arranged at the end portion of the rotor; the second magnetic part and one end, close to the first magnetic part, of the rotor are arranged at intervals in the axial direction of the rotor, and the second magnetic part is movably arranged in the axial direction of the rotor; the first end face of the first magnetic part and the second end face of the second magnetic part are oppositely arranged and have opposite magnetic poles, so that the second magnetic part is driven to move under the action of magnetic force; the position detection piece is arranged on the second magnetic piece, and the position detection piece is provided with a scale portion extending in the axial direction of the rotor. According to the technical scheme provided by the utility model, the technical problem that the detection result of the axial position of the rotor of the permanent magnet synchronous motor is not visual enough in the prior art can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a rotor position detection structure and a motor having the same. Background Art

[0002] Currently, high-speed permanent magnet synchronous motors (PMSMs) offer advantages such as compact size, high efficiency, high power density, low moment of inertia, fast dynamic response, and a wide speed regulation range. Their speeds can reach tens to hundreds of thousands of revolutions per minute (RPM). High-speed PMSMs are widely used in applications such as high-power compressors and blowers, and in flywheel energy storage for renewable energy sources. They eliminate the need for mechanical speed-boosting devices, improving system efficiency and achieving energy conservation and consumption reduction. However, when a high-speed PMSM rotates at high speeds, the axial position of the rotor will shift due to unavoidable factors such as the rotor's static and dynamic balance and thermal elongation of the shaft. To facilitate high-precision and efficient control of PMSMs using vector control technology, it is necessary to monitor the axial position of the motor's rotor.

[0003] However, existing methods for detecting the axial position of a permanent magnet synchronous motor's rotor are based on the principle that the magnitude and direction of the electromotive force (EMF) at different positions vary. These methods determine the rotor's axial position by detecting the back EMF generated by the rotor's motion. This results in less than intuitive detection results and can only be performed when the motor is rotating at a certain speed, limiting the conditions under which the rotor's axial position can be detected. Utility Model Content

[0004] The main purpose of the utility model is to provide a rotor position detection structure and a motor having the same, so as to solve the problem in the prior art that the detection result of the axial position of the rotor of the permanent magnet synchronous motor is not intuitive enough.

[0005] In order to achieve the above object, according to one aspect of the present invention, a rotor position detection structure is provided for detecting the position of the rotor of a motor, comprising:

[0006] A first magnetic member is provided at an end of the rotor;

[0007] a second magnetic member spaced apart from an end of the rotor proximate to the first magnetic member along the axial direction of the rotor, and movably arranged along the axial direction of the rotor; a first end face of the first magnetic member and a second end face of the second magnetic member being arranged opposite to each other with opposite magnetic poles, so as to drive the second magnetic member to move under the action of magnetic force;

[0008] The position detecting component is arranged on the second magnetic component, and is provided with a scale portion extending along the axial direction of the rotor.

[0009] Furthermore, the rotor position detection structure further includes:

[0010] The guide member has a first guide portion, the second magnetic member has a second guide portion that cooperates with the first guide portion for guidance, at least one of the first guide portion and the second guide portion extends along the axial direction of the rotor, and the second magnetic member is movably arranged on the guide member along the axial direction of the rotor.

[0011] Furthermore, the guide member is a guide sleeve, the first guide portion is a guide space surrounded by the inner ring of the guide sleeve, and the guide space extends along the axial direction of the rotor; the second guide portion is the outer peripheral surface of the second magnetic member, and the guide sleeve is sleeved on the second magnetic member.

[0012] Furthermore, a lubrication groove is provided on the inner wall surface of the guide sleeve, and a lubrication medium is provided in the lubrication groove.

[0013] Furthermore, the guide sleeve is provided with oil inlet holes and oil outlet holes that pass through the inner and outer sides of the guide sleeve at intervals, and the oil inlet holes and the oil outlet holes are both connected to the lubrication groove;

[0014] Wherein, the oil inlet is located above the oil outlet; and / or,

[0015] The flow cross section of the oil inlet hole on the side close to the lubrication groove is larger than the flow cross section of the oil inlet hole on the side away from the lubrication groove; and / or,

[0016] The oil outlet hole includes a tapered hole section, the diameter of the flow cross section of the tapered hole section close to the lubrication groove is d2, the diameter of the flow cross section of the tapered hole section away from the lubrication groove is d3, and d3 / d2<0.75.

[0017] Furthermore, the rotor position detection structure further includes a flow stopper, which is movably disposed at the oil outlet to block or avoid the oil outlet; and / or,

[0018] The lubrication groove is an annular groove on the inner wall periphery of the ring guide sleeve.

[0019] Furthermore, the rotor position detection structure further includes:

[0020] The reference part is used to be arranged opposite to the scale part of the position detection component to determine the axial displacement of the rotor according to the correspondence between the scale values of the reference part and the scale part.

[0021] Furthermore, the reference part is a light indicator, and the light emitted by the light indicator is arranged opposite to the scale part of the position detection part; or,

[0022] The reference portion is an indicator rod, one end of which is arranged opposite to the scale portion of the position detection member; or

[0023] The rotor detection structure also includes a guide sleeve, which is mounted on the second magnetic part. The end surface of the guide sleeve away from the first magnetic part forms a reference part. A part of the position detection part is located in the guide sleeve, and the other part of the position detection part extends out of the reference part.

[0024] Furthermore, the end of the rotor where the first magnetic member is provided is a non-magnetic conductive portion; and / or,

[0025] The rotor position detection structure further includes a magnetic isolation member, which is arranged at an end of the first magnetic member and is located on a side of the first magnetic member away from the second magnetic member; and / or,

[0026] A through hole is provided at the central axis of the second magnetic component. The position detecting component is passed through the through hole and extends in a direction away from the axial direction of the rotor.

[0027] Furthermore, the rotor position detection structure further includes:

[0028] A magnetic isolation member is provided at the end of the rotor, and is located on a side of the first magnetic member away from the second magnetic member;

[0029] The locking member is arranged at the end of the rotor, and the magnetic isolation member is located on a side of the first magnetic member close to the second magnetic member.

[0030] Furthermore, the end of the rotor is a necked section, and the magnetic isolation member, the first magnetic member and the locking member are sequentially sleeved on the necked section; and / or,

[0031] The locking member is made of non-magnetic material. At least a portion of the first magnetic member protrudes from the locking member and is arranged opposite to the second magnetic member.

[0032] Furthermore, the magnetic isolation member, the first magnetic member and the locking member are all circular structures, the outer diameter of the first magnetic member is D1, the outer diameter of the first magnetic member is D2, the outer diameter of the magnetic isolation member is D3, and the outer diameter of the locking member is D4;

[0033] Wherein, D1 / D3 ≥ 1; and / or,

[0034] D2 / D1 ≥ 1; and / or,

[0035] 0.4≤D4 / D1≤0.7.

[0036] According to another aspect of the present invention, there is provided a motor, comprising:

[0037] The rotor position detection structure provided above;

[0038] The rotor has two ends respectively located at both ends, and a rotor position detection structure is provided on at least one of the two ends.

[0039] By applying the technical solution of the present invention, a first magnetic member is fixedly mounted on the rotor, a second magnetic member is movably mounted near the rotor, and the same magnetic poles of the first and second magnetic members are arranged relative to each other. According to the principle that like-charged magnets repel each other, when the axial position of the rotor changes, the second magnetic member will move along the axial direction of the rotor and away from the first magnetic member due to the repulsive magnetic force of the first magnetic member. The second magnetic member drives the position detection member to move, so that the position of the scale portion on the position detection member changes. In this way, the change in the axial position of the rotor can be detected by simply recording the change in the scale value on the scale portion, making the detection result more intuitive. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0041] Figure 1 shows a cross-sectional view of a rotor position detection structure provided according to an embodiment of the present utility model;

[0042] Figure 2 A three-dimensional schematic diagram of an embodiment of a guide member of a rotor position detection structure provided in accordance with an embodiment of the present utility model is shown;

[0043] Figure 3 A cross-sectional view of a guide member of a rotor position detection structure provided in accordance with an embodiment of the present utility model is shown;

[0044] Figure 4 A schematic diagram of the installation structure of the guide member, the second magnetic member and the flow stop member provided according to an embodiment of the present utility model is shown.

[0045] The above drawings include the following reference numerals:

[0046] 10. a first magnetic member;

[0047] 20. Second magnetic member; 21. Second guide portion;

[0048] 30. Position detection parts;

[0049] 40. Guide member; 41. First guide portion; 42. Oil outlet hole; 43. Lubrication groove; 44. Oil inlet hole;

[0050] 50. Flow stopper;

[0051] 60. Reference Department;

[0052] 70. Magnetic isolation parts;

[0053] 80. Locking piece;

[0054] 90. Rotor; 91. Neck section. DETAILED DESCRIPTION

[0055] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0056] like Figure 1 As shown, embodiment 1 of the present invention provides a rotor position detection structure, which is used to detect the position of the rotor 90 of the motor. The rotor position detection structure includes a first magnetic member 10, a second magnetic member 20 and a position detection member 30. The first magnetic member 10 is arranged at the end of the rotor 90; the second magnetic member 20 and the end of the rotor 90 close to the first magnetic member 10 are spaced apart along the axial direction of the rotor 90, and the second magnetic member 20 is movably arranged along the axial direction of the rotor 90; the first end face of the first magnetic member 10 and the second end face of the second magnetic member 20 are arranged opposite to each other and have the same magnetic poles, so as to drive the second magnetic member 20 to move under the action of magnetic force; the position detection member 30 is arranged on the second magnetic member 20, and the position detection member 30 is provided with a scale portion extending along the axial direction of the rotor 90.

[0057] According to the technical solution provided by this embodiment, a first magnetic member 10 is fixedly provided on the rotor 90, and a second magnetic member 20 is movably provided near the rotor 90. The magnetic poles of the first magnetic member 10 and the second magnetic member 20 on the opposite sides are the same, both being S poles or N poles, and the two are arranged at intervals. By utilizing the principle that like-charged magnets repel each other, when the axial position of the rotor 90 changes, the second magnetic member 20 will drive the position detection member 30 to move away from the first magnetic member 10, so that the position of the scale portion on the position detection member 30 changes. In this way, the change in the axial position of the rotor 90 can be detected according to the change in the scale value on the scale portion, making the detection result more intuitive and clear, and easy to observe. Therefore, the technical solution provided by this embodiment can solve the problem that the axial position detection result of the rotor of the permanent magnet synchronous motor in the prior art is not intuitive enough.

[0058] Furthermore, by detecting the axial displacement of rotor 90, precise control of the motor can be achieved, ensuring stable operation of the motor. The rotor position detection structure of this embodiment is simple in structure and can be implemented in a cavity, which facilitates intuitive display of changes in the axial position of rotor 90, effectively avoiding excessive increases in the volume and moment of inertia of rotor 90, and improving the operational reliability of rotor 90.

[0059] Specifically, the first magnetic member 10 is fixedly mounted at the end of the rotor 90. The first magnetic member 10 may be a magnetic ring structure to ensure that the magnetic force is directed in the axial direction of the rotor 90. The second magnetic member may be a magnetic steel. The first magnetic member 10 and the second magnetic member 20 are coaxially aligned to ensure that the magnetic force between the first magnetic member 10 and the second magnetic member 20 can stably drive the second magnetic member 20 to move circumferentially along the rotor 90.

[0060] It should be noted that the change in the axial position of the rotor 90 may be caused by factors such as static and dynamic balance eccentricity of the rotor 90 and thermal elongation of the shaft.

[0061] Before detecting the axial position of the rotor 90, the first magnetic member 10 and the second magnetic member 20 can be brought as close together as possible and the spacing between the first magnetic member 10 and the second magnetic member 20 can be adjusted to the minimum spacing l to ensure the minimum spacing during assembly. Subsequently, the rotor 90 is in operation. When the axial position of the rotor 90 changes, the second magnetic member 20 moves along the axial direction of the rotor 90 and away from the first magnetic member 10 due to the effect of magnetism, and drives the position detection member 30 fixed on the second magnetic member 20 to move together. By recording the scale of the position detection member 30 at different times of the rotor 90, the axial position of the rotor 90 at the corresponding time can be obtained, thereby being able to simply and intuitively display the axial position change of the rotor 90. Specifically, the scale value of the corresponding scale portion of the rotor 90 before operation can be recorded as the initial scale value. After the rotor 90 is operating, the scale value of the corresponding scale portion of the rotor 90 is used as the detection scale value (there can be multiple detection scale values corresponding to different operating moments of the rotor 90). The initial scale value is subtracted from the detection scale value to obtain the corresponding change in the rotor's circumferential position. In addition, the rotor position detection structure of the present invention has a simple structure, is easy to install, and is not prone to failure.

[0062] In addition, when the axial position of the rotor 90 is mainly caused by the thermal expansion of the shaft, the axial expansion of the rotor 90 can be determined according to the change in the axial position of the rotor 90, and then the temperature of the rotor 90 can be calculated by reverse deduction through the expansion formula.

[0063] Specifically, the rotor 90 may adopt an IPM (surface mounted) or SPM (insert mounted) structure.

[0064] like Figures 2 to 4As shown, the rotor position detection structure further includes a guide member 40 having a first guide portion 41. The second magnetic member 20 has a second guide portion 21 that cooperates with the first guide portion 41 in a guiding manner. At least one of the first guide portion 41 and the second guide portion 21 extends along the axial direction of the rotor 90. The second magnetic member 20 is movably disposed on the guide member 40 along the axial direction of the rotor 90. This structural arrangement facilitates guiding the movement of the second magnetic member 20, prevents deviation in the movement direction of the second magnetic member 20, and ensures accurate detection of the axial position of the rotor 90.

[0065] Specifically, the guide member 40 is fixed relative to the stator and can be installed on a fixed structure of the motor such as a fixed support, a fixed sleeve, or a motor housing, a stator, etc. The second magnetic member 20 can move axially relative to the rotor 90 within the guide member 40. The guide member 40 and the second magnetic member 20 are connected by a first guide portion 41 and a second guide portion 21. The first guide portion 41 and the second guide portion 21 cooperate with each other and extend along the axial direction of the rotor 90, so that the second magnetic member 20 can slide freely axially relative to the rotor 90 within the guide member 40 under the magnetic force of the first magnetic member 10. The first guide portion 41 and the second guide portion 21 can be any sliding connection with less resistance such as a slide rail, or the first guide portion 41 can be a guide space extending along the axial direction of the rotor 90.

[0066] In this embodiment, the guide member 40 is a guide sleeve. The first guide portion 41 is a guide space enclosed by the inner ring of the guide sleeve, extending axially along the rotor 90. The second guide portion 21 is the outer circumferential surface of the second magnetic member 20, and the guide sleeve is mounted on the second magnetic member 20. This provides a simple structure and easy installation, ensuring stable guiding of the second magnetic member 20.

[0067] Specifically, the inner ring of the guide sleeve and the outer peripheral surface of the second magnetic component 20 are in a sliding connection with a clearance fit. The guide sleeve extends along the axial direction of the rotor 90, and the second magnetic component 20 is arranged in a guide space formed by the first guide portion 41, so that the second magnetic component 20 can slide freely in the guide sleeve along the axial direction of the rotor 90.

[0068] Specifically, a lubrication groove 43 is provided on the inner wall of the guide sleeve, and a lubricating medium is provided in the lubrication groove 43. This can reduce friction between the second magnetic member 20 and the inner wall of the lubrication groove 43, allowing the second magnetic member 20 to move smoothly along the axial direction of the rotor 90, and effectively protecting the second magnetic member 20 and the guide sleeve.

[0069] Specifically, the lubrication groove 43 is a groove filled with a lubricating medium such as lubricating oil or grease to reduce the friction coefficient between the guide member 40 and the second magnetic member 20, preventing the axial displacement of the second magnetic member 20 from being affected by friction between the wall surfaces, thereby ensuring the accuracy of the intuitive display of the scale value corresponding to the scale portion. Specifically, by providing the lubricating medium, the friction between the guide member 40 and the second magnetic member 20 can be reduced to negligible.

[0070] Specifically, the guide sleeve is provided with oil inlet holes 44 and oil outlet holes 42 that pass through the inner and outer sides of the guide sleeve at intervals. The oil inlet holes 44 and the oil outlet holes 42 are both communicated with the lubrication groove 43 .

[0071] The oil inlet hole 44 is located above the oil outlet hole 42 , so that the oil can flow smoothly to the oil outlet hole 42 after entering the lubrication groove 43 through the oil inlet hole 44 , thereby being fully lubricated.

[0072] Specifically, the flow cross-section of the oil inlet hole 44 on the side close to the lubrication groove 43 is larger than the flow cross-section of the oil inlet hole 44 on the side away from the lubrication groove 43. In this way, the lubricating oil at the oil inlet hole 44 can be smoothly guided to a larger area, thereby better ensuring the lubrication effect.

[0073] Specifically, the oil inlet hole 44 includes a first hole segment and a second hole segment connected in sequence. The diameter of the first hole segment is d0, and the diameter of the second hole segment is d1. The first hole segment is located on the side of the second hole segment close to the lubrication groove 43. d0>d1, so as to ensure sufficient lubrication performance and eliminate friction interference factors.

[0074] In this embodiment, the oil outlet hole 42 includes a tapered hole section. The diameter of the flow cross-section of the tapered hole section near the lubrication groove 43 is d2, and the diameter of the flow cross-section of the tapered hole section away from the lubrication groove 43 is d3, where d3 / d2 is less than 0.75. This structural arrangement prevents the lubricating oil from rapidly flowing out of the oil outlet hole 42, thereby preventing poor lubrication due to rapid oil discharge.

[0075] Specifically, an oil inlet 44 is provided at the upper end of the lubrication groove 43. The oil inlet 44 connects the outer wall of the guide member 40 with the upper end wall of the lubrication groove 43, and is used to replenish the lubricant, prevent friction from increasing, and ensure the long-term reliability of the structural measurement results. An oil outlet 42 is provided at the bottom of the lubrication groove 43. The oil outlet 42 connects the wall of the lubrication groove 43 of the guide member 40 with the outer wall of the guide member 40. The oil outlet 42 includes a tapered hole section, the diameter of which gradually decreases along the extension direction from the inner wall of the guide member 40 to the outer wall of the guide member 40. The oil outlet 42 is used to discharge the lubricant between the guide sleeve and the second magnetic member 20.

[0076] Specifically, the rotor position detection structure also includes a flow stopper 50, which is movably positioned at the oil outlet 42 to block or avoid the oil outlet 42. In the absence of external force, the flow stopper 50 blocks the oil outlet 42, preventing the lubricating oil from flowing out of the oil outlet 42 and ensuring the lubricating effect of the lubricating oil. When oil needs to be discharged, the flow stopper 50 is simply repositioned by external force to create a clearance between the flow stopper 50 and the oil outlet 42.

[0077] Specifically, the flow stopper 50 may be a spherical structure.

[0078] Specifically, the flow stop member 50 is arranged in the tapered hole section of the oil outlet hole 42 and contacts and cooperates with the tapered wall surface of the oil outlet hole 42 to seal the oil outlet hole 42 through the flow stop member 50 to prevent the lubricating medium from flowing out of the oil outlet hole 42 during use; when the lubricating medium needs to be discharged, a sharp object is inserted into the hole along the outer wall surface of the oil outlet hole 42 to separate the flow stop member 50 from the wall surface of the oil outlet hole 42, so that the lubricating medium can be discharged.

[0079] Specifically, along the extending direction from the inner ring of the guide sleeve to the outer ring of the guide sleeve, the flow cross section of the oil outlet hole 42 gradually decreases, which can facilitate better reducing the speed of the lubricating oil flowing out through the oil outlet hole 42.

[0080] Specifically, the oil outlet hole 42 also includes a connecting section, which is located on the side of the tapered hole section close to the lubrication groove 43. The connecting section is a uniform cross-sectional structure, and the diameter of the flow section of the connecting section is greater than or equal to the diameter of the maximum flow section of the tapered hole section.

[0081] In this embodiment, the lubrication groove 43 is an annular groove on the periphery of the inner wall of the ring guide sleeve. In this way, it is convenient to fully lubricate the outer wall of the second magnetic component 20 and the inner wall of the guide sleeve, ensuring the lubrication effect, and thus allowing the second magnetic component 20 to move smoothly relative to the guide sleeve along the axial direction of the rotor 90.

[0082] Specifically, the rotor position detection structure further includes a reference portion 60, which is disposed opposite the scale portion of the position detection member 30. The reference portion 60 is used to determine the axial displacement of the rotor 90 based on the correspondence between the reference portion 60 and the scale portion. This provides a reference for the axial displacement of the rotor 90, facilitating determination of the axial displacement of the rotor 90.

[0083] Specifically, to ensure the stability of the reference datum, the reference portion 60 is fixed. Specifically, the reference portion 60 can be located on the end surface of the guide sleeve away from the rotor 90. When the scale value of the position detector 30 needs to be read, the scale value indicated by the reference portion 60 and the position detector 30 is used as the current position reading of the rotor 90.

[0084] Specifically, the reference portion 60 is a light indicator, the light emitted by the light indicator being disposed opposite the scale portion of the position detection member 30; or the reference portion 60 is an indicator rod, one end of which is disposed opposite the scale portion of the position detection member 30; or the rotor position detection structure further comprises a guide sleeve fixedly disposed relative to the second magnetic member 20, the guide sleeve being mounted on the second magnetic member 20, the end surface of the guide sleeve at one end away from the first magnetic member 10 forming the reference portion 60, a portion of the position detection member 30 being located within the guide sleeve, and another portion of the position detection member 30 being disposed protruding from the reference portion 60. When the reference portion 60 is a light indicator, the scale at the illuminated location is the reading of the position detection member 30; when the reference portion 60 is an indicator rod, the indicator rod contacts the position detection member 30, and the intersection and overlap position of the indicator rod and the position detection member 30 is the reading of the position detection member 30; when the reference portion 60 is the end surface of the guide sleeve, the end surface is aligned with the end surface, and the position where the end surface and the scale value overlap is the reading of the position detection member 30.

[0085] Specifically, the reference portion 60 is provided on an end surface of the guide sleeve away from the rotor 90 and points to the scale portion on the position detecting member 30 .

[0086] Specifically, the end of the rotor 90 where the first magnetic component 10 is provided is a non-magnetic portion, thereby preventing the end of the rotor 90 where the first magnetic component 10 is provided from being a magnetic portion and affecting the magnetic force between the first magnetic component 10 and the second magnetic component 20, thereby affecting the axial movement of the second magnetic component 20 along the rotor.

[0087] Specifically, the rotor position detection structure further includes a magnetic shielding member 70, which is disposed at the end of the first magnetic member 10 and located on the side of the first magnetic member 10 away from the second magnetic member 20. This prevents the magnetic force of the magnetic portion of the rotor 90 from acting on the first magnetic member 10, thereby affecting the magnetic force between the first magnetic member 10 and the second magnetic member 20. This ensures that the movement of the first magnetic member 10 effectively drives the axial movement of the second magnetic member 20 along the rotor, thereby ensuring the accuracy of detecting the circumferential displacement of the rotor 90.

[0088] Specifically, rotor 90 includes a core shaft and a magnetic steel structure. The magnetic steel structure is mounted on the core shaft. The core shaft can be made of a non-magnetic material, or the core shaft end (corresponding to the end of rotor 90 where first magnetic member 10 is provided) can be made of a non-magnetic material. Magnetic isolation member 70 is primarily used to prevent magnetic interference from the internal magnetic steel structure in the middle portion of the rotor.

[0089] Specifically, a through hole is provided at the central axis of the second magnetic member 20, and the position detection member 30 is disposed within the through hole and extends in an axial direction away from the rotor 90. Thus, by disposing the position detection member 30 at the through hole at the central axis of the second magnetic member 20, it is possible to minimize tilting or offsetting of the position detection member 30, thereby ensuring detection accuracy of the position detection member 30.

[0090] In this embodiment, there are two groups of rotor position detection structures, and the two groups of rotor position detection structures are respectively arranged at the two ends of the rotor 90. Preferably, the two ends of the rotor 90 are made of non-magnetic material to better avoid the situation where the magnetic force between the first magnetic part 10 and the second magnetic part 20 is affected by the use of magnetic conductive materials at the two ends of the rotor 90, thereby affecting the position detection accuracy. Preferably, magnetic isolation parts 70 are provided at both ends of the rotor 90, and the magnetic isolation parts 70 are arranged on the side of the first magnetic part 10 away from the second magnetic part. Specifically, the magnetic isolation part 70 can be a magnetic isolation ring, which is sleeved on the end of the rotor 90. The magnetic isolation part 70 is made of non-magnetic material to isolate the magnetic force of the magnetic part on the rotor 90 from the magnetic force of the first magnetic part 10, and to avoid the magnetic force between the first magnetic part 10 and the second magnetic part 20 from being interfered by the magnetic force of the magnetic part of the rotor 90.

[0091] Specifically, the rotor position detection structure further includes a magnetic shielding member 70 and a locking member 80. The magnetic shielding member 70 is provided at the end of the rotor 90 and is located on the side of the first magnetic member 10 away from the second magnetic member 20. The locking member 80 is provided at the end of the rotor 90 and is located on the side of the first magnetic member 10 close to the second magnetic member 20. The first magnetic member 10 is provided between the magnetic shielding member 70 and the locking member 80. The magnetic shielding member 70 is used to isolate the magnetism of the magnetic members inside the rotor 90. The locking member 80 is provided on the outside of the magnetic shielding member 70 and the first magnetic member 10 to press the two together to the end of the rotor 90, preventing the first magnetic member 10 from moving axially and affecting the accuracy of detection, thereby improving the accuracy of axial detection of the rotor 90.

[0092] Specifically, the end of the rotor 90 is a necked section 91, and the magnetic isolation member 70, the first magnetic member 10 and the locking member 80 are sequentially sleeved on the necked section 91. In this way, it is convenient to position the magnetic isolation member 70, the first magnetic member 10 and the locking member 80 and facilitate installation.

[0093] Specifically, the diameter of the end portion of the rotor 90 is smaller than the diameter of the middle portion of the rotor 90 , and the magnetic isolation member 70 , the first magnetic member 10 and the locking member 80 are disposed on the end portion of the rotor 90 from the inside out.

[0094] Specifically, the locking member 80 is made of a non-magnetic material, and at least a portion of the first magnetic member 10 protrudes from the locking member 80 and is disposed opposite the second magnetic member 20. This effectively prevents the locking member 80 from affecting the magnetic force between the first magnetic member 10 and the second magnetic member 20, allowing the magnetic force between the first magnetic member 10 and the second magnetic member 20 to effectively push the second magnetic member 20 to move.

[0095] Specifically, the diameter of the first magnetic member 10 is greater than the diameter of the locking member 80 .

[0096] Specifically, the magnetic isolation member 70, the first magnetic member 10 and the locking member 80 are all annular structures, the outer diameter of the first magnetic member 10 is D1, the outer diameter of the first magnetic member 10 is D2, the outer diameter of the magnetic isolation member 70 is D3, and the outer diameter of the locking member 80 is D4.

[0097] Among them, D1 / D3≥1, the outer diameter of the first magnetic component 10 is greater than or equal to the diameter of the magnetic isolation component 70, so that there is sufficient magnetic force between the first magnetic component 10 and the second magnetic component 20 to ensure stable driving of the second magnetic component 20.

[0098] Specifically, D2 / D1≥1, and the diameter of the second magnetic part 20 is greater than or equal to the diameter of the first magnetic part 10, so that there is sufficient magnetic force between the first magnetic part 10 and the second magnetic part 20 to ensure stable driving of the second magnetic part 20 and facilitate intuitive monitoring of the axial position changes of the rotor 90.

[0099] Specifically, 0.4≤D4 / D1≤0.7, the ratio of the outer diameter of the locking member 80 to the diameter of the first magnetic member 10 is greater than or equal to 0.4 and less than or equal to 0.7. In this way, it can prevent the locking member 80 from being too large to isolate the magnetism of the first magnetic member 10 and affect the magnetic force between the first magnetic member 10 and the second magnetic member 20, and can also avoid the situation where the locking effect is poor due to the locking member 80 being too small.

[0100] A second embodiment of the present invention provides a motor including the rotor position detection structure provided in the above-described embodiment. A rotor 90 has two ends, one at each end, and at least one of the ends is provided with a rotor position detection structure. Providing rotor position detection structures at each end of the motor's rotor 90 allows for measurement of axial displacement at each end of the rotor 90, providing more accurate measurement data. Regardless of the direction of rotation of the rotor 90, displacement or extension toward either end, real-time monitoring is possible.

[0101] From the above description, it can be seen that the above-mentioned embodiment of the present invention achieves the following technical effects: a first magnetic member 10 is fixedly provided on the rotor 90, and a second magnetic member 20 is movably provided near the rotor 90. Utilizing the principle that like-charged magnets repel each other, the spacing between the two magnetic members is first set to a minimum spacing. When the rotor 90 is extended due to irresistible factors, the second magnetic member 20 moves in the direction of axial extension of the rotor 90 due to the effect of magnetism, and drives the position detection member 30 fixed on the second magnetic member 20 to move together. By recording the scale of the position detection member 30 before and after the extension of the rotor 90, the displacement of the second magnetic member 20 is obtained by subtracting the two, which is the extension of the rotor 90. Then, the temperature of the rotor 90 is obtained by reverse deduction using the expansion formula. The present invention is easy to install, not prone to failure, and can be monitored in real time regardless of the axial displacement of the rotor 90. The structure is simple and intuitive.

[0102] 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, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0103] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present 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. 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 can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0104] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this 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. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0105] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the 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.

[0106] 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.

[0107] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A rotor position detection structure for detecting the position of a rotor (90) of a motor, characterized in that: include: a first magnetic member (10) disposed at an end of the rotor (90); a second magnetic member (20) spaced apart from an end of the rotor (90) close to the first magnetic member (10) along the axial direction of the rotor (90), and the second magnetic member (20) is movably arranged along the axial direction of the rotor (90); a first end face of the first magnetic member (10) and a second end face of the second magnetic member (20) are arranged opposite to each other and have the same magnetic poles, so as to drive the second magnetic member (20) to move under the action of magnetic force; A position detection member (30) is provided on the second magnetic member (20), and a scale portion extending along the axial direction of the rotor (90) is provided on the position detection member (30).

2. The rotor position detection structure according to claim 1, characterized in that: The rotor position detection structure further includes: A guide member (40), wherein the guide member (40) has a first guide portion (41), the second magnetic member (20) has a second guide portion (21) that is guided and matched with the first guide portion (41), at least one of the first guide portion (41) and the second guide portion (21) extends along the axial direction of the rotor (90), and the second magnetic member (20) is movably arranged on the guide member (40) along the axial direction of the rotor (90).

3. The rotor position detection structure according to claim 2, characterized in that: The guide member (40) is a guide sleeve, the first guide portion (41) is a guide space surrounded by the inner ring of the guide sleeve, and the guide space extends along the axial direction of the rotor (90); the second guide portion (21) is the outer peripheral surface of the second magnetic member (20), and the guide sleeve is mounted on the second magnetic member (20).

4. The rotor position detection structure according to claim 3, characterized in that: A lubrication groove (43) is provided on the inner wall surface of the guide sleeve, and a lubrication medium is provided in the lubrication groove (43).

5. The rotor position detection structure according to claim 4, characterized in that: The guide sleeve is provided with an oil inlet hole (44) and an oil outlet hole (42) which pass through the inner and outer sides of the guide sleeve at intervals, and the oil inlet hole (44) and the oil outlet hole (42) are both communicated with the lubrication groove (43); Wherein, the oil inlet hole (44) is located above the oil outlet hole (42); and / or, The flow cross section of the oil inlet hole (44) on the side close to the lubrication groove (43) is larger than the flow cross section of the oil inlet hole (44) on the side away from the lubrication groove (43); and / or, The oil outlet hole (42) includes a tapered hole section, the diameter of the flow cross section of the tapered hole section on the side close to the lubrication groove (43) is d2, the diameter of the flow cross section of the tapered hole section on the side away from the lubrication groove (43) is d3, and d3 / d2<0.

75.

6. The rotor position detection structure according to claim 5, characterized in that: The rotor position detection structure further includes a flow stopper (50), wherein the flow stopper (50) is movably disposed at the oil outlet hole (42) to block or avoid the oil outlet hole (42); and / or, The lubricating groove (43) is an annular groove surrounding the inner wall periphery of the guide sleeve.

7. The rotor position detection structure according to claim 1, characterized in that: The rotor position detection structure further includes: A reference portion (60) is provided opposite to the scale portion to determine the axial displacement of the rotor (90) according to the correspondence between the reference portion (60) and the scale value of the scale portion.

8. The rotor position detection structure according to claim 7, characterized in that: The reference portion (60) is a light indicator, and the light emitted by the light indicator is arranged opposite to the scale portion; or, The reference portion (60) is an indicator rod, one end of which is arranged opposite to the scale portion; or The rotor position detection structure further comprises a guide sleeve, wherein the guide sleeve is sleeved on the second magnetic member (20), and an end surface of the guide sleeve at one end away from the first magnetic member (10) forms the reference portion (60), a portion of the position detection member (30) is located in the guide sleeve, and another portion of the position detection member (30) is extended out of the reference portion (60).

9. The rotor position detection structure according to claim 1, characterized in that: The end of the rotor (90) where the first magnetic member (10) is provided is a non-magnetic conductive portion; and / or, The rotor position detection structure further comprises a magnetic isolation member (70), wherein the magnetic isolation member (70) is arranged at an end of the first magnetic member (10), and the magnetic isolation member (70) is located on a side of the first magnetic member (10) away from the second magnetic member (20); and / or, A through hole is provided at the central axis of the second magnetic component (20), and the position detection component (30) is inserted into the through hole and extends in an axial direction away from the rotor (90).

10. The rotor position detection structure according to claim 1, characterized in that: The rotor position detection structure further includes: a magnetic isolation member (70) disposed at an end of the rotor (90), the magnetic isolation member (70) being located on a side of the first magnetic member (10) away from the second magnetic member (20); The locking member (80) is arranged at the end of the rotor (90), and the magnetic isolation member (70) is located on a side of the first magnetic member (10) close to the second magnetic member (20).

11. The rotor position detection structure according to claim 10, characterized in that: The end of the rotor (90) is a necked section (91), and the magnetic isolation member (70), the first magnetic member (10) and the locking member (80) are sequentially sleeved on the necked section (91); and / or, The locking member (80) is made of a non-magnetic material, and at least a portion of the first magnetic member (10) is protruding from the locking member (80) and is arranged opposite to the second magnetic member (20).

12. The rotor position detection structure according to claim 10, characterized in that: The magnetic isolation member (70), the first magnetic member (10) and the locking member (80) are all annular structures, the outer diameter of the first magnetic member (10) is D1, the outer diameter of the first magnetic member (10) is D2, the outer diameter of the magnetic isolation member (70) is D3, and the outer diameter of the locking member (80) is D4; Wherein, D1 / D3 ≥ 1; and / or, D2 / D1 ≥ 1; and / or, 0.4≤D4 / D1≤0.

7.

13. A motor, characterized in that: include: The rotor position detection structure according to any one of claims 1 to 12; A rotor (90) has two ends respectively located at both ends, and the rotor position detection structure is provided on at least one of the two ends.

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