A brushless DC motor with strong magnetic field resistance and high overload

Abstract

The present invention relates to a DC brushless motor with strong magnetic field resistance and high overload resistance, which belongs to the field of motor technology and solves the problem of unstable motor performance under high overload conditions in the prior art. The present invention comprises: a stator assembly, a rotor assembly, a sensor assembly, an end cover and an elastic reset assembly; the rotor assembly is rotatably mounted inside the stator assembly; the stator assembly comprises: a housing, an iron core and a winding formed by laminating silicon steel sheets; the rotor assembly comprises: a shaft and an annular magnetic steel; an elastic reset assembly is arranged between the rotor assembly and the end cover, and the elastic reset assembly is used to buffer the impact load borne by the rotor assembly. The present invention improves the impact resistance of the motor.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a high-overload DC brushless motor that is resistant to strong magnetic fields. Background Art

[0002] Existing electric motors can adapt to some application scenarios, but under strong magnetic fields and high overload conditions, the performance of existing motors as actuators will be affected.

[0003] Since the motor's rotor is a moving part, for use scenarios under strong magnetic fields and high overload conditions, the motor's rotor structure needs to be able to move normally after withstanding the high overload environment. The magnetic energy of the rotor's permanent magnet cannot be weakened after being subjected to strong magnetism, and it cannot affect the normal function of the motor.

[0004] Strong magnetic fields (for example, magnetic ore mining) and high overloads (for example, high-speed rotating equipment, high-speed transmitting equipment, etc.) put forward higher standards for the performance of motors. Therefore, it is necessary to provide a new motor to achieve stable performance of the motor under strong magnetic fields and high overload conditions. Summary of the invention

[0005] In view of the above analysis, the present invention aims to provide a method for solving the problem of unstable motor performance under existing high overload conditions.

[0006] The purpose of the present invention is mainly achieved through the following technical solutions:

[0007] A high overload DC brushless motor resistant to strong magnetic fields comprises: a stator assembly, a rotor assembly, a sensor assembly, an end cover and an elastic reset assembly; the rotor assembly is rotatably mounted inside the stator assembly; the stator assembly comprises: a housing, an iron core formed by laminating silicon steel sheets and a winding; the rotor assembly comprises: a shaft and an annular magnetic steel; the housing is welded and fixed to the end cover; an elastic reset assembly is arranged between the rotor assembly and the end cover, and the elastic reset assembly is used to buffer the impact load borne by the rotor assembly.

[0008] Furthermore, the iron core is sleeved on the inner side of the housing, and the winding is sleeved on the inner side of the iron core.

[0009] Furthermore, the stator assembly also includes: a first support ring, an adapter plate and a second support ring; there are two first support rings, which are respectively installed at both ends of the iron core; the adapter plate is installed on the first support ring, and the winding lead is welded on the adapter plate; the second support ring is arranged between the adapter plate and the end cover.

[0010] Furthermore, the shaft and the annular magnetic steel are bonded and fixed by glue.

[0011] Furthermore, the rotor assembly also includes: a dynamic balancing baffle; the dynamic balancing baffle and the annular magnetic steel are arranged in parallel on the outside of the shaft, and one end of the annular magnetic steel is limited by the shaft shoulder of the shaft, and the other end is limited by the dynamic balancing baffle.

[0012] Furthermore, the sensor assembly is arranged between the end cover and the stator assembly; the sensor assembly includes: a Hall element and a Hall board PCB board; the number of the Hall elements is 3, and the 3 Hall elements are flatly attached to the Hall PCB board.

[0013] Furthermore, a boss structure is provided on one side of the end cover close to the shaft; and the elastic reset component is sleeved on the outside of the boss structure.

[0014] Furthermore, the rotor assembly also includes a first bearing and a second bearing; the rotor assembly is rotatably mounted with the stator assembly via the first bearing and the second bearing.

[0015] Furthermore, the end cover includes: a flat portion and an annular portion; the annular portion is arranged on one side of the flat portion; the flat portion of the end cover is welded and fixed to the casing; the annular portion is sleeved inside the casing and fixed to the casing by pins.

[0016] Furthermore, the elastic reset assembly includes: a disc spring and a wave washer.

[0017] Specifically, the casing is a cylindrical structure; the motor casing and the front end cover of the motor casing are an integrated structure and together serve as the casing.

[0018] The disc spring cover is arranged outside the boss structure, the disc spring is arranged between the shaft and the end cover; the wave washer is arranged between the second bearing and the end cover.

[0019] The technical solution of the present invention can achieve at least one of the following effects:

[0020] 1. The present invention designs a casing of a strong magnetic induction ferromagnetic material. When the ferromagnetic material such as the casing of the strong magnetic induction reaches saturation magnetic density, a magnetic shielding cover is generated inside the cavity thereof, thereby forming magnetic protection inside the motor.

[0021] 2. The high-overload DC brushless motor resistant to strong magnetic fields of the present invention is manufactured with a housing and a front cover that are integrally processed, and the rear cover is welded as a whole to form a relatively closed magnetic shielding space, thereby improving the ability to resist strong magnetic fields and further improving the overall overload resistance of the motor.

[0022] 3. The high-overload DC brushless motor resistant to strong magnetic fields of the present invention innovatively adopts the design of impact-resistant elastic reset components to effectively solve the problem of strong impact during the motor launch process.

[0023] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0025] Figure 1 : Schematic diagram of the motor structure of the present invention;

[0026] Figure 2 : Schematic diagram of the strong impact resistant structure of the present invention;

[0027] Figure 3 : A schematic diagram of the structure of the stator assembly of the present invention;

[0028] Figure 4 : A schematic diagram of the structure of the rotor assembly of the present invention;

[0029] Figure 5 : Schematic diagram of the rotor surface magnetic curve of the present invention;

[0030] Figure 6 : Schematic diagram of the sensor assembly structure of the present invention.

[0031] Reference numerals:

[0032] 01-first bearing; 02-stator assembly; 03-rotor assembly; 04-sensor assembly; 05-end cover; 06-pin; 07-elastic reset assembly; 08-second bearing;

[0033] 021- housing; 022- iron core; 023- winding; 024- first support ring; 025- connecting plate assembly; 026- second support ring;

[0034] 031-shaft; 032-annular magnetic steel; 033-dynamic balance baffle;

[0035] 041-Hall element; 042-Hall board PCB board;

[0036] 051- flat plate portion; 052- annular portion; 053- boss structure. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0038] Example 1

[0039] A specific embodiment of the present invention discloses a high overload DC brushless motor that can resist strong magnetic fields. Figure 1 As shown, it includes: a bearing, a stator assembly 02, a rotor assembly 03, a sensor assembly 04, an end cover 05, a pin 06 and an elastic reset assembly 07; the rotor assembly 3 is rotatably installed inside the stator assembly 2; the stator assembly 2 includes: a housing 021, an iron core 022 formed by stacking silicon steel sheets and a winding 023; the rotor assembly 3 includes: a shaft 031 and an annular magnetic steel 032; an elastic reset assembly 07 is arranged between the rotor assembly 3 and the end cover 5, and the elastic reset assembly 07 is used to buffer the impact load borne by the rotor assembly 3.

[0040] In a specific embodiment of the present invention, the stator assembly 02 and the rotor assembly 03 are rotatably connected through bearings; specifically, the bearings include a first bearing 01 and a second bearing 08; the first bearing 01 and the second bearing 08 are respectively mounted at both ends of the stator assembly 02 and the rotor assembly 03, such as Figure 1 shown.

[0041] In a specific embodiment of the present invention, the end cover 05 is fixedly connected to the housing 021 by welding. The present invention achieves a sealed connection between the end cover 05 and the housing 021 by welding the housing 021 and the end cover 05, thereby achieving good magnetic shielding performance.

[0042] Specifically, Figure 1 , Figure 2 As shown, the end cover 5 includes: a flat portion 051 and an annular portion 052; the annular portion 052 is arranged on one side of the flat portion 051; the flat portion 051 of the end cover 5 is welded and fixed to the housing 021; the annular portion 052 is sleeved inside the housing 021 and fixed to the housing 021 by a pin 06.

[0043] Furthermore, if Figure 2 As shown, the elastic return assembly 07 is arranged between the second bearing 08 and the end cover 05.

[0044] The following describes the specific structure of each component:

[0045] I. Stator assembly 2:

[0046] like Figure 3As shown, the stator assembly 2 further includes: a first support ring 024 , an adapter plate 025 and a second support ring 026 .

[0047] The iron core 022 is sleeved on the inner side of the housing 021, and the winding 023 is sleeved on the inner side of the iron core 022. When the winding 023 is energized, a rotating magnetic field is generated to drive the rotor assembly 03 to rotate, thereby realizing the rotation output of the motor.

[0048] The stator assembly 2 also includes: a first support ring 024, an adapter plate 025 and a second support ring 026; there are two first support rings 024, which are respectively installed at both ends of the iron core 022; the adapter plate 025 is installed on the first support ring 024, and the lead wire of the winding 023 is welded on the adapter plate 025; the second support ring 026 is arranged between the adapter plate 023 and the end cover 05.

[0049] Specifically, the first support ring 024 is sleeved on the outside of the winding 023 and is arranged at both ends of the iron core 022, and is used to limit the axial position of the iron core 022; the adapter plate 025 is arranged on the first support ring 024 near the end cover 05, and is fixedly connected to the first support ring 024. The second support ring 026 is arranged between the adapter plate 025 and the end cover 05, and is used to locate the axial position of the adapter plate 025 and the first support ring 024.

[0050] In a specific embodiment of the present invention, the housing 021 is a cylindrical structure with one end open; a shaft hole is provided at the bottom of the housing 021, and the other end of the housing 021 is open. One end of the shaft 031 of the rotor assembly 03 is arranged in the shaft hole; the other end of the shaft 031 is rotatably connected to the annular portion 052 of the end cover 05 through the second bearing 08; the end cover 05 is fixedly connected to the housing 021, such as Figure 1 shown.

[0051] Specifically, the end cover 05 is connected to the housing 021 by laser welding, and a plurality of pins 06 are evenly installed along the circumferential direction of the housing 021 , and the pins 06 pass through the housing 021 and are inserted into the end cover 05 ; the plurality of pins 06 are used to enhance the impact resistance of the end cover 05 .

[0052] Preferably, the housing 021 is processed in an integrated manner to reduce magnetic flux leakage gaps and reduce the impact of the external magnetic field on the internal magnetic field of the motor.

[0053] Preferably, the iron core 022 is interference fit with the inner side of the housing 021 , or the outer wall of the iron core 022 is coated with glue and bonded to the inner side of the housing 021 .

[0054] Preferably, the winding 023 is fixed in the iron core 022 , and a layer of insulating paper is provided between the winding and the iron core. The winding 023 is wound by enameled wire and embedded in the iron core 022 .

[0055] During implementation: first, the winding 023 is installed into the iron core 022, and then the whole is pressed into the housing 021, and the first support ring 024 is further installed at the rear end of the iron core 022, and the adapter plate 025 is installed on the first support ring 024, and further, the lead wire of the winding 023 is welded to the adapter plate 025; then, the second support ring 026 is welded to the adapter plate 025 to complete the production of the stator assembly 02.

[0056] Preferably, after the stator assembly 02 is assembled in place, the stator assembly 02 is then potted as a whole, and resin is used to fill the installation gaps between the plurality of windings 023 and between the windings 023 and the iron core 022 to improve the strength of the stator assembly 02 .

[0057] Preferably, the housing 022 is made of a ferromagnetic material with strong magnetic induction to improve magnetic shielding performance.

[0058] Preferably, if Figure 3 As shown, the iron core 022 is formed by stacking a plurality of annular silicon steel sheets with a thickness of 0.1 to 0.5 mm. Preferably, the thickness of the annular silicon steel sheets is 0.2 mm.

[0059] The present invention further improves the anti-demagnetization capability of the permanent magnet magnetic steel of the motor by designing the magnetic steel thickness of the iron core 022.

[0060] II. Rotor assembly 03:

[0061] like Figure 4 As shown, the rotor assembly 03 includes: a shaft 031, an annular magnetic steel 032, and a dynamic balancing baffle 033. The annular magnetic steel 032 and the dynamic balancing baffle 033 are sleeved on the outside of the shaft 031 in parallel.

[0062] Specifically, the dynamic balancing baffle 033 and the annular magnetic steel 032 are arranged in parallel on the outside of the shaft 031 , and one end of the annular magnetic steel 032 is limited by the shaft shoulder of the shaft 031 , and the other end is limited by the dynamic balancing baffle 033 .

[0063] like Figure 1 As shown, the shaft 031 of the rotor assembly 03 is rotatably connected to the housing 021 through the first bearing 01, and the shaft 031 of the rotor assembly 03 is rotatably connected to the end cover 05 through the second bearing 08. The end cover 05 and the housing 021 are fixed as a whole, thereby realizing the rotatable installation of the rotor assembly 03 and the housing 021.

[0064] Preferably, the shaft 031 and the annular magnetic steel 032 are bonded and fixed by high-temperature resistant and high-strength glue.

[0065] Preferably, the annular magnetic steel 032 is oriented and magnetized by using a HALBACH magnet structure, and preferably two pairs of poles are selected. The material of the annular magnetic steel 032 is high temperature resistant and high performance neodymium iron boron.

[0066] Preferably, the shaft 031 is made of high-strength magnetic steel.

[0067] Furthermore, the dynamic balance of the rotor assembly 03 can be adjusted by de-weighting the dynamic balance baffle 033. Specifically, the de-weighting method is to chamfer the dynamic balance baffle 033 or to cut the dynamic balance baffle 033 to reduce its own weight.

[0068] After the rotor assembly 03 is assembled, dynamic balancing is performed on the dynamic balancing baffle 033 in a weight-removing manner. Preferably, the balancing grade is ≤G6.3, and can meet the condition of ≥15000rpm for smooth operation.

[0069] like Figure 5 As shown, preferably, the surface magnetic curve of the annular magnetic steel 032 is approximately sinusoidal distribution, and the surface magnetic peak value is ≥3000Gs.

[0070] like Figure 6 As shown, preferably, the sensor assembly 04 is mounted on the step groove of the annular portion 052 of the end cover 05, and the distance between the Hall sensing surface on the sensor assembly 04 and the magnetic sensing end surface of the rotor assembly 03 is t, where t is the Hall sensing distance.

[0071] Preferably, the value range of t is 1.5 to 3.5 mm.

[0072] Furthermore, if Figure 4 As shown, a shoulder is provided on the shaft 031 of the rotor assembly 03 for axial positioning and impact resistance of the annular magnetic steel 032, and the thickness of the shoulder is t1; preferably, the size of t is between 1.5 and 3.5 mm.

[0073] like Figure 4 As shown, one end of the annular magnetic steel 032 contacts the shaft shoulder and is axially positioned through the shaft shoulder, and the other end of the annular magnetic steel 032 contacts the dynamic balancing baffle 033 and is axially positioned through the dynamic balancing baffle 033.

[0074] Specifically, the dynamic balancing baffle 033 and the shaft 031 are fixedly connected by welding, bonding or interference fit.

[0075] Preferably, the outer diameter of the first bearing 01 and the end cover 05 are clearance-fitted, and the inner diameter of the first bearing 01 and the shaft 031 are clearance-fitted. Similarly, the outer diameter of the second bearing 08 and the end cover 05 are clearance-fitted, and the inner diameter of the second bearing 08 and the shaft 031 are clearance-fitted.

[0076] During implementation, when the shaft 031 and the second bearing 08 are clearance-fitted:

[0077] When the inner surface diameter of the inner ring of the second bearing 08 is the maximum limit size and the diameter of the shaft 031 is the minimum limit size, the assembled second bearing 08 and shaft 031 are in the loosest fitting state, which is called the maximum clearance Xmax.

[0078] When the inner diameter of the inner ring of the second bearing 08 is the minimum limit size and the diameter of the shaft 031 is the maximum limit size, the assembled second bearing 08 and shaft 031 are in the tightest fit state, which is called the minimum clearance Xmin. The fit between the second bearing 08 and the end cover 05 is similar.

[0079] In a specific embodiment of the present invention, a hole-based clearance fit is preferably used, for example, H7 / g6, H7 / h6, H8 / f7, H8 / h7, H9 / d9, H9 / h9, H11 / c11 or H11 / h11.

[0080] In the present invention, under the condition that the shaft 031 and the winding 023 can rotate relative to each other, the outer ring of the second bearing 08 and the end cover 05, as well as the inner ring of the second bearing 08 and the shaft 031 are matched with a clearance fit rather than a traditional interference fit, so that the shaft 031 can be axially displaced relative to the second bearing 08 when bearing a high-intensity impact, thereby avoiding the impact being transmitted to the bearing and causing damage to the bearing. After the impact ends, the shaft 031 can return to its original position through the elastic reset component 07, thereby achieving the decomposition and buffering of high-intensity impact loads.

[0081] III. Impact-resistant structure:

[0082] In a specific embodiment of the present invention, Figure 2 As shown, preferably, a boss structure 053 is provided on the end cover 05 to resist strong axial impact of the bearing and the rotor assembly 03.

[0083] like Figure 2 As shown, a step groove is provided at the end of the annular portion 052 of the end cover 05 ; the sensor assembly 04 is installed in the step groove of the end cover 05 .

[0084] like Figure 2 As shown, the second bearing 08 is installed inside the annular portion 052 of the end cover 05; and an elastic reset component 07 is arranged between the second bearing 08 and the bottom surface of the end cover 05; the end of the rotor component 03 is installed in the inner ring of the second bearing 08, and the elastic reset component 07 ensures the reset of the rotor component 03 after the impact is completed.

[0085] In a specific implementation of the present invention, a boss structure 053 is provided on one side of the end cover 05 close to the shaft 031 ; and the elastic reset component 07 is sleeved on the outside of the boss structure 053 .

[0086] In a specific embodiment of the present invention, ΦD is set as the outer diameter of the strong impact resistant boss; Φd is the diameter of the shaft 031 of the rotor assembly 03. The outer diameter ΦD of the boss structure 053 of the end cover 05 and the shaft diameter Φd of the shaft 031 satisfy the relationship: ΦD = Φd + (2-7) mm.

[0087] The present invention sets the relationship between the outer diameter ΦD of the boss structure 053 and the shaft diameter Φd of the shaft 031 to ensure that the strong impact load borne by the shaft 031 of the rotor assembly 03 is transmitted to the boss structure 053 through the shaft 031 to avoid the bearing being subjected to the impact load. An elastic reset component 07 is set between the end cover 05 and the second bearing 08 to ensure that the rotor assembly is reset after the impact is completed.

[0088] Preferably, the end cover 05 is connected to the housing 021 by laser welding to close the magnetic flux leakage gap, and then N strong impact resistant pins 06 are evenly distributed along the housing cylinder, preferably the number N is 3 to 6, to improve the reliability of strong impact resistance.

[0089] Preferably, the elastic reset assembly 07 includes: a disc spring and a wave washer.

[0090] In a specific embodiment of the present invention, the disc spring cover is arranged outside the boss structure 053, and the disc spring is arranged between the shaft 031 and the end cover 05; the disc spring buffers the impact load on the shaft 031; and the shaft 031 is reset. The wave washer is arranged between the second bearing 08 and the end cover, and the wave washer buffers the displacement of the second bearing 08 under the impact load, and the second bearing 08 is reset.

[0091] like Figure 2 As shown, preferably, the axial clearance between the shaft 031 of the rotor assembly 03 and the boss structure 053 is H, preferably with a value between 0.3 and 1 mm; the axial distance between the boss structure 053 on the end cover 05 and the end face of the inner ring of the second bearing 08 is H1, preferably with a value between 0.5 and 1.2 mm, and H1 ≥ H.

[0092] During implementation: when the shaft 031 is subjected to a high-intensity impact load, it will undergo axial displacement relative to the bearing, and then impact the boss structure 053 and the disc spring. The shaft 031 is blocked by the boss structure 053 to limit its displacement, and the disc spring buffers the impact force of the shaft 031, thereby achieving a primary buffering of the impact energy. Part of the impact force borne by the shaft 031 is absorbed and deformed by the disc spring (after compression), and the other part is transmitted to the second bearing 08. When the second bearing 08 is subjected to an axial impact, it will undergo axial displacement relative to the end cover 05, thereby compressing the corrugated washer. The corrugated washer buffers the impact energy of the second bearing 08, thereby achieving a secondary buffering of the impact energy, and achieving the reset of the second bearing 08 after the impact ends. In the present invention, the buffering of the axial impact load is achieved through the two-stage buffering of the elastic reset component 07, and the reset of the shaft 031 and the bearing can be achieved.

[0093] IV. Sensor assembly 04:

[0094] like Figure 1 As shown, the sensor assembly 04 is arranged between the end cover 05 and the stator assembly 2; Figure 6 As shown, the sensor assembly 04 includes: a Hall element 041 and a Hall plate PCB 042. The sensor assembly 04 is used to monitor the magnetic field strength inside the motor.

[0095] Specifically, the number of the Hall elements 041 is 3, and the 3 Hall elements are flatly attached to the Hall PCB board 042. Figure 6 As shown, the mechanical angle between adjacent Hall elements 041 is θ, θ satisfies θ=120N / p, N is a positive integer, and θ≤120°, and p is the number of pole pairs of the annular magnetic steel 032 .

[0096] Preferably, θ=120°.

[0097] Preferably, the winding 024 is coupled with the main magnetic circuit to obtain a sinusoidal high back-EMF waveform as the annular magnetic steel 032 of the rotor assembly 03 rotates.

[0098] like Figure 2 As shown, the axial distance between the bottom surface of the Hall PCB board 042 and the end surface of the second bearing 08 is H2, and the preferred value is between 0.3 and 1 mm; the axial distance between the boss structure 053 and the bottom surface of the Hall PCB board 042 is C, and the bearing thickness is B; wherein, C=B+H1+H2.

[0099] It is worth noting that the present invention only describes in detail the parts of the technical solution that are different from the prior art, and does not repeat the parts that the motor shares with the prior art, which does not affect the implementation of the technical solution of the present invention by those skilled in the art.

[0100] Compared with the prior art, the technical solution provided by this embodiment has at least one of the following beneficial effects:

[0101] 1. The high-overload DC brushless motor with strong magnetic field resistance of the present invention optimizes the motor magnetic field by setting a sealed connection between the housing 021 and the end cover 05, and increases the air gap flux per unit volume as much as possible while leaving a reasonable air gap length, so as to meet the motor performance requirements and the influence of the strong magnetic field environment on the annular magnetic steel 032. The magnetic steel adopts the HALBACH structure to orient and magnetize the annular magnetic steel 032, so that the motor air gap magnetic field approaches sinusoidal, the motor operation harmonic content is low, and the winding back electromotive force presents a sinusoidal shape. It can effectively reduce motor losses, improve motor efficiency, torque density, power density, etc., improve the stability of motor control and operation, reduce torque pulsation, and reduce motor vibration.

[0102] 2. In the high-overload DC brushless motor resistant to strong magnetic fields of the present invention, the winding 023 is potted with epoxy resin, which improves the structural strength, waterproof properties, and insulation strength properties of the winding 023, improves the working life and reliability of the motor, and improves the power density of the motor at the same volume.

[0103] 3. The high-overload DC brushless motor resistant to strong magnetic fields of the present invention innovatively uses a strong magnetic induction ferromagnetic material as the housing 021. Through the closed structural design of the housing 021 and the end cover 05, a magnetic shielding cover is formed in the internal cavity of the motor, which effectively solves the problem of strong magnetic field impact during the motor launch process.

[0104] 4. The high-overload DC brushless motor resistant to strong magnetic fields of the present invention has an end cover 05 designed with an impact-resistant boss structure 053, which effectively solves the problem of the motor bearing strong impacts. Further, by optimizing the motor parameters and integrating the requirements for the motor to resist strong impacts, while meeting the motor indicators, the dynamic balancing baffle 033 is used to de-weight the weight of the motor and the rotor assembly 03, thereby reducing the impact force under overload conditions from the source and improving the reliability of the product under strong impacts.

[0105] 5. The present invention adopts an integrated shaft and annular magnetic steel structure design to disperse the force to the boss structure 053. The boss structure 053 is set at the end of the impact direction, which effectively improves the reliability of the motor under strong impact. The stator component 02 is integrally encapsulated, and the first support ring 024 and the second support ring 026 are set in the impact direction to effectively apply the axial strong impact resistance of the stator component 02 to the end cover 05, ensuring that the position of the stator component 02 does not loosen after a strong impact, and ensuring the reliability of the product. The present invention uses limited welding between the housing 021 and the end cover 05, and then equips it with a highly reliable and strong impact-resistant pin 06 to ensure that the product has no risk of falling off after a strong impact, while improving the magnetic shielding performance.

[0106] 6. The high overload motor resistant to strong magnetic fields of the present invention has the advantages of strong magnetic field environment resistance, strong impact resistance, compact structure, small size, small loss, high efficiency, large power and torque density, high back electromotive force sinusoidal, low waveform distortion rate, stable operation, low vibration, small torque fluctuation, high dynamic response speed, high reliability, etc. The present invention can be applied to strong magnetic field environment and high overload impact environment. In addition, the motor of the present invention can be applied to electromagnetic artillery shell guidance.

[0107] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A DC brushless motor with strong magnetic field resistance and high overload resistance, characterized in that: include: A stator assembly (02), a rotor assembly (03), a sensor assembly (04), an end cover (05) and an elastic reset assembly (7); the rotor assembly (03) is rotatably mounted inside the stator assembly (02); the housing (021) and the end cover (05) are welded and fixed; an elastic reset assembly (7) is arranged between the rotor assembly (03) and the end cover (05), and the elastic reset assembly (7) is used to buffer the impact load borne by the rotor assembly (03); The stator assembly (02) comprises: a housing (021), an iron core (022) formed by laminating silicon steel sheets, and a winding (023); The iron core (022) is sleeved on the inner side of the housing (021), and the winding (023) is sleeved on the inner side of the iron core (022); The rotor assembly (03) comprises: a shaft (031) and an annular magnetic steel (032); The shaft (031) and the annular magnetic steel (032) are bonded and fixed by glue; The sensor assembly (04) is arranged between the end cover (05) and the stator assembly (02); A boss structure (053) is provided on one side of the end cover (05) close to the shaft (031); The elastic reset assembly (7) comprises: a disc spring and a wave washer; The housing (021) is a cylindrical structure; the motor housing and the front end cover of the motor housing are an integrated structure and together serve as the housing (021); The disc spring cover is arranged outside the boss structure (053), and the disc spring is arranged between the shaft (031) and the end cover (05); the disc spring buffers the impact load on the shaft (031) and realizes the reset of the shaft (031); the wave washer is arranged between the second bearing (08) and the end cover, and the wave washer buffers the displacement of the second bearing (08) under the impact load and realizes the reset of the second bearing (08); When the shaft (031) is subjected to a high-intensity impact load, it will undergo axial displacement relative to the second bearing (08), thereby impacting the boss structure (053) and the disc spring. The shaft (031) is blocked by the boss structure (053) to limit its displacement, and the disc spring buffers the impact force of the shaft (031), thereby achieving a primary buffering of the impact energy. Part of the impact force borne by the shaft (031) is absorbed and deformed by the disc spring, and the other part is transmitted to the second bearing (08). When the second bearing (08) is subjected to an axial impact, it will undergo axial displacement relative to the end cover (05), thereby compressing the corrugated washer. The corrugated washer buffers the impact energy of the second bearing (08), thereby achieving a secondary buffering of the impact energy, and the second bearing (08) is reset after the impact ends.

2. The strong magnetic field resistant high overload DC brushless motor according to claim 1, characterized in that: The rotor assembly (03) further comprises a first bearing (01) and a second bearing (08); the rotor assembly (03) is rotatably mounted with the stator assembly (02) via the first bearing (01) and the second bearing (08).

3. The strong magnetic field resistant high overload DC brushless motor according to claim 2, characterized in that: The end cover (05) comprises: a flat plate portion (051) and an annular portion (052); the annular portion (052) is arranged on one side of the flat plate portion (051); the flat plate portion (051) is welded and fixed to the housing (021); the annular portion (052) is sleeved inside the housing (021) and fixed to the housing (021) via a pin (06).

4. The strong magnetic field resistant high overload DC brushless motor according to claim 1, characterized in that: The sensor component (04) comprises: a Hall element (041) and a Hall plate PCB (042).

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