Low-noise motor

Abstract

The invention provides a low-noise motor, and relates to the technical field of motors. The low-noise motor comprises a motor shell, a power connection box installed at the top of the motor shell, a stator assembly installed on the inner side wall of the motor shell, rotor bearings arranged at the centers of the front side wall and the rear side wall of the motor shell, and rotor assemblies installed on inner shafts of the two rotor bearings. Variable damping supporting assemblies are installed at the centers of the front side wall and the rear side wall of the motor shell correspondingly, each variable damping supporting assembly comprises a supporting sleeve installed on the outer wall of the motor shell, and the two rotor bearings are installed at the centers of the two supporting sleeves correspondingly. According to the invention, the problems that heat cannot be dissipated due to long-term operation of the motor and the bearing displaces due to the fact that the bearing bears huge pressure and friction force from the rotor assembly are solved, and the possibility of bearing deflection is reduced through the magnetorheological fluid with variable damping, so that the vibration of the shaft lever and the noise generated by the vibration are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a low-noise motor. Background Art

[0002] A low-noise motor is a type of motor that produces less noise during operation. It uses reasonable stator and rotor slot matching and improved core structure to make the magnetic field inside the motor more evenly distributed, reducing vibration and noise caused by magnetic field distortion. It plays a key role in many fields, especially in the medical field. For noise-sensitive instruments and equipment such as medical centrifuges and dialysis equipment, low-noise motors can ensure the normal operation of the equipment while avoiding noise troubles for patients and medical staff.

[0003] Generally, when a motor is just started, it can often ensure high efficiency and low noise. However, during long-term use, the bearings are subjected to huge pressure and friction from the rotor assembly. Long-term action will cause wear of the ball, raceway and other components inside the bearings. At the same time, if the heat generated by the motor when it is working cannot be dissipated in time and effectively, the bearings will be in a high-temperature environment, causing changes in their material properties, which will in turn affect the structural strength and stability of the bearings, causing the position of the bearings to gradually deviate from the initial state. After the bearing position is offset, the axis of rotation of the shaft is no longer stable, and the shaft will vibrate when it rotates. On the one hand, this vibration will change the gap between the shaft and surrounding components such as the stator assembly, resulting in increased local friction, generating more heat, and further deteriorating the working environment of the motor. On the other hand, the vibration will be transmitted through the motor casing, generating a lot of noise and interfering with the surrounding environment. Moreover, continuous vibration will accelerate the wear and fatigue of other parts of the motor, reduce the overall performance and service life of the motor, and in severe cases may even cause motor failure, affecting the normal operation of the equipment, and causing adverse consequences such as production interruption or equipment damage.

[0004] Based on the above viewpoints, the present invention provides a low-noise motor. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a low-noise motor, which solves the problem that the heat of the motor cannot be dissipated due to long-term operation and the bearings are subjected to huge pressure and friction from the rotor assembly, resulting in bearing displacement. By using magnetorheological fluid with variable damping, the possibility of bearing deflection is reduced, thereby reducing the vibration of the shaft and the noise generated by the vibration.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a low-noise motor, comprising a motor housing, a power connection box installed on the top of the motor housing casing, a stator assembly installed on the inner side wall of the motor housing, a rotor bearing arranged at the center of the front and rear side walls of the motor housing, and a rotor assembly installed on the inner shafts of two rotor bearings, a variable damping support assembly is installed at the center of the front and rear side walls of the motor housing, the variable damping support assembly comprises a support sleeve installed on the outer wall of the motor housing, two rotor bearings are respectively installed at the centers of two support sleeves, a magnetorheological fluid storage tank for storing magnetorheological fluid is opened inside the support sleeve, a plurality of connecting pieces are fixedly connected inside the magnetorheological fluid storage tank, the magnetorheological fluid stored in the magnetorheological fluid storage tank passes through the plurality of connecting pieces and contacts with the rotor bearing, an electromagnetic coil is arranged between the motor housing and the variable damping support assembly, power supply lines are connected to the input and output ends of the electromagnetic coil, the power supply lines are connected to the power connection box, and multiple groups of rotor vibration detection parts are arranged on the outer side of the shaft of the rotor assembly; Both ends of the shaft rod of the rotor assembly are connected to a detachable driving shaft in a limited sliding manner, the other end of the detachable driving shaft is connected to a connecting shaft in a limited sliding manner, a follow-up assembly is fixedly connected to the outer wall of the detachable driving shaft, and a damping drive assembly is arranged between the follow-up assembly and the variable damping support assembly.

[0007] Preferably, the rotor vibration detection element is preferably at least two groups of photoelectric acceleration sensors, wherein one group of photoelectric acceleration sensors is arranged on the longitudinal axis of the rotor assembly, and the other group of photoelectric acceleration sensors is arranged on the transverse axis of the rotor assembly, and the rotor vibration detection element is electrically connected to the electrical box.

[0008] Preferably, the follow-up component includes a follow-up sleeve, in which a plurality of wedge-shaped elastic components distributed in a circular array are installed, the damping drive component includes a driving disk, a surface of the driving disk in contact with the follow-up sleeve is provided with a plurality of arc-shaped grooves matching with the wedge-shaped elastic components, a driving ring is fixedly connected to the front side wall of the driving disk, a circulation component is installed inside the magnetorheological fluid storage tank, the circulation component includes a fixing plate, the lower side wall of the fixing plate is fixedly connected with a circulation piston by a spring, a circulation channel is provided in the circulation piston, a one-way opening and closing valve plate which opens one way downward is installed in the circulation channel, and a sliding groove matching with the driving ring is provided on the outer side wall of the circulation piston.

[0009] Preferably, a circulation groove for connecting the inner and outer ends of the magnetorheological fluid storage tank is provided inside the support sleeve, and a heat sink is also installed inside the support sleeve, one end of the heat sink is placed inside the circulation groove, and the other end of the heat sink is in contact with the outer wall of the motor housing.

[0010] Preferably, the wedge-shaped elastic component includes a limiting spring protrusion, the limiting spring protrusion is embedded in an arc-shaped groove, the limiting spring protrusion is connected to the rotating sleeve through a spring, the interior of the rotating sleeve is also connected to a spring push rod through a spring, the spring push rod is provided with a wedge-shaped groove that matches the bottom end of the limiting spring protrusion, and the outer ends of several of the wedge-shaped grooves are fixedly connected to connecting rings.

[0011] Preferably, a plurality of damping support components are installed inside the driving disk, and the damping support component includes a lever plate connected to the inside of the driving disk by a pin shaft, the outer end pin shaft of the lever plate is connected to a driving rod, and the inner end pin shaft of the lever plate is connected to a damping support rod, and the damping support rod and the driving rod are both limitedly slidably connected to the inside of the driving disk.

[0012] Preferably, a thermal deformation component is also installed on the inner wall of the support sleeve, and the thermal deformation component includes a bimetallic strip, and the front side of the bimetallic strip is fixedly connected to a liquid pushing piston through a spring, and the other end of the liquid pushing piston is placed inside the magnetorheological fluid storage tank.

[0013] Preferably, the outer side wall of the driving disk is rotatably connected in the magnetorheological fluid storage tank.

[0014] The present invention has the following technical points and beneficial effects: 1. When the vibration of the rotor assembly is within the normal range, the follow-up assembly will drive the damping drive assembly to rotate together, and the convex structure on the drive ring will continuously drive the circulation component to slide up and down through the slide groove, so that the magnetorheological fluid in the low damping state circulates inside the magnetorheological fluid storage tank, and the flowing magnetorheological fluid is used to carry away the heat accumulated on the rotor bearing. During the flow of the magnetorheological fluid, it will continuously contact the heat sink, so that the heat taken away by the magnetorheological fluid is quickly dissipated to the outside, effectively avoiding the motor vibration caused by the deformation of the rotor bearing due to overheating of the rotor bearing, and at the same time reducing the noise caused by the rotor vibration.

[0015] 2. When the shaft begins to vibrate with a large amplitude, the magnetorheological fluid changes from a low-damping, low-viscosity fluid state to a high-damping, high-viscosity solid-like state. The high viscosity of the magnetorheological fluid means that the friction between its internal molecules increases, making it difficult to flow. This friction will resist the vibration movement of the rotor, converting the mechanical energy of the vibration into heat energy, reducing the vibration energy transmitted to other parts of the motor or the outside world, thereby reducing the generation of vibration noise. The change in the damping state achieves a support effect on the rotor bearing.

[0016] 3. When the shaft begins to vibrate with a large amplitude, the end of the damping support rod is squeezed onto the shaft, and the support of the damping support rod is used to prevent the rotor from making a large displacement inside the motor, which would affect the normal operation of the motor. The damping support rod can absorb and consume vibration energy, thereby reducing the vibration amplitude of the rotor. This helps to reduce noise and vibration during motor operation, improve the smoothness of the motor operation, and make the motor output more stable.

[0017] 4. When one end of the shaft is stuck, causing the shaft to be unable to rotate normally, electrical energy cannot be effectively converted into mechanical energy and output to the outside, thereby generating a large amount of heat energy, and this part cannot be effectively dissipated. At this time, the bimetallic strip will deform forward in a phase, thereby driving the push piston to push the magnetorheological fluid in the magnetorheological fluid storage tank, thereby driving the damping drive assembly to move in the direction of the connecting shaft, thereby driving the detachable drive shaft to separate from the shaft portion of the rotor, and finally the detachable drive shaft will be completely merged with the connecting shaft. At this time, the rotor shaft is no longer engaged with external devices, ensuring the normal rotation of the rotor shaft and avoiding the problem of overheating and burning of the motor caused by external devices being stuck. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the present invention after the motor housing and the power supply line are hidden; Figure 3 is a first top view of the present invention; Figure 4 for Figure 3 Isometric section view along AA; Figure 5 for Figure 4 The enlarged schematic diagram of point B in the middle; Figure 6 for Figure 4 The enlarged schematic diagram of the center C; Figure 7 It is a schematic structural diagram of the wedge-shaped elastic component and the damping support component in the present invention; Figure 8 is a schematic diagram of a variable damping support assembly in the present invention; Fig. 9 is a second top view of the present invention; Fig.10 It is an isometric cross-sectional view of the damping drive assembly, the variable damping support assembly and the rotor vibration detection member in the present invention; Fig.11 It is a schematic diagram of the internal structure of the variable damping support assembly in the present invention.

[0019] Among them, 1. Motor housing; 2. Power connection box; 3. Power supply line; 4. Stator assembly; 5. Rotor assembly; 6. Follow-up assembly; 7. Damping drive assembly; 8. Electromagnetic coil; 9. Variable damping support assembly; 10. Rotor vibration detection part; 11. Separable drive shaft; 12. Connecting shaft; 13. Rotor bearing; 61. Rotating sleeve; 62. Wedge-shaped elastic component; 71. driving disk; 72. arc-shaped slot; 73. damping support component; 74. driving ring; 91. Support sleeve; 92. Magnetorheological fluid storage tank; 93. Circulation tank; 94. Thermal deformation component; 95. Circulation component; 96. Heat sink; 97. Connecting piece; 621, a limit spring protrusion; 622, a spring push rod; 623, a wedge-shaped groove; 624, a connecting ring; 731, driving rod; 732, lever sheet; 733, damping support rod; 941, bimetallic strip; 942, liquid-pushing piston; 951, fixed plate; 952, circulating piston; 953, circulating flow channel; 954, one-way opening and closing valve plate; 955, slide groove. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Embodiment 1 like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6As shown, an embodiment of the present invention provides a low-noise motor, including a motor housing 1, an electrical connection box 2 installed on the top of the motor housing 1, a stator assembly 4 installed on the inner wall of the motor housing 1, a rotor bearing 13 arranged at the center of the front and rear side walls of the motor housing 1, and a rotor assembly 5 installed on the inner shafts of the two rotor bearings 13, a variable damping support assembly 9 is installed at the center of the front and rear side walls of the motor housing 1, the variable damping support assembly 9 includes a support sleeve 91 installed on the outer wall of the motor housing 1, two rotor bearings 13 are respectively installed at the centers of the two support sleeves 91, a magnetorheological fluid storage tank 92 for storing magnetorheological fluid is opened inside the support sleeve 91, a plurality of connecting pieces 97 are fixedly connected inside the magnetorheological fluid storage tank 92, the magnetorheological fluid stored in the magnetorheological fluid storage tank 92 passes through the plurality of connecting pieces 97 and contacts with the rotor bearing 13, an electromagnetic coil 8 is arranged between the motor housing 1 and the variable damping support assembly 9, and the electric The input and output ends of the magnetic coil 8 are both connected to a power supply line 3, which is connected to the power connection box 2. A plurality of rotor vibration detection components 10 are arranged on the outside of the shaft of the rotor assembly 5. The rotor vibration detection components 10 are preferably at least two groups of photoelectric acceleration sensors, one of which is arranged on the longitudinal axis of the rotor assembly 5, and the other is arranged on the transverse axis of the rotor assembly 5. The rotor vibration detection components 10 are electrically connected to the power connection box 2. When the rotor shaft vibrates, the reflection and transmission conditions of the light source of the photoelectric acceleration sensor irradiated on the shaft change, and the photoelectric element converts the changed light signal into an electrical signal, and then analyzes the electrical signal to obtain the shaft vibration information. This type of sensor is arranged on the transverse axis and the longitudinal axis of the shaft, and can detect the vibration components of these two positions respectively, thereby ensuring the comprehensiveness of vibration monitoring. The photoelectric sensor can be selected from the HK-MR660 series of Hongke.

[0022] like Figure 3 , Figure 4 , Fig. 9 and Fig.10As shown, the follow-up assembly 6 includes a follow-up sleeve 61, in which a plurality of wedge-shaped elastic components 62 distributed in a circular array are installed, the damping drive assembly 7 includes a drive disk 71, and a plurality of arc-shaped grooves 72 matching the wedge-shaped elastic components 62 are provided on the surface of the drive disk 71 in contact with the follow-up sleeve 61, a drive ring 74 is fixedly connected to the front side wall of the drive disk 71, and a circulation component 95 is installed inside the magnetorheological fluid storage tank 92, and the circulation component 95 includes a fixed plate 951, and a circulation piston 952 is fixedly connected to the lower side wall of the fixed plate 951 through a spring, and the circulation piston 952 is fixedly connected to the lower side wall of the fixed plate 951. A circulation channel 953 is provided in the plug 952, and a one-way opening and closing valve plate 954 that opens downward in one direction is installed in the circulation channel 953. A slide groove 955 that matches the drive ring 74 is provided on the outer wall of the circulation piston 952. A circulation groove 93 for connecting the inner and outer ends of the magnetorheological fluid storage tank 92 is provided inside the support sleeve 91. A heat sink 96 is also installed inside the support sleeve 91. One end of the heat sink 96 is placed inside the circulation groove 93, and the other end of the heat sink 96 contacts the outer wall of the motor housing 1. When the vibration of the rotor assembly 5 is within the normal range, the magnetorheological fluid The magnetorheological fluid stored in the magnetorheological fluid storage tank 92 is in a low-damping fluid state. At this time, as the rotor assembly 5 rotates, it will drive the rotating assembly 6 to rotate together, and the limit spring protrusion 621 is stuck in the arc groove 72, so the rotating assembly 6 will drive the damping drive assembly 7 to rotate together, and the protrusion structure on the drive ring 74 will continuously drive the circulation component 95 to slide up and down through the slide groove 955. When the circulation component 95 moves downward, it will squeeze the magnetorheological fluid in the magnetorheological fluid storage tank 92 into the circulation groove 93 and gather above the circulation piston 952. When the circulation component 95 moves upward, the one-way opening and closing valve plate 954 opens, allowing the magnetorheological fluid to flow back into the magnetorheological fluid storage tank 92, so that the magnetorheological fluid in the low damping state circulates inside the magnetorheological fluid storage tank 92, and the flowing magnetorheological fluid is used to carry away the heat accumulated on the rotor bearing 13. During the flow of the magnetorheological fluid, it will continuously contact the heat sink 96, so that the heat taken away by the magnetorheological fluid is quickly dissipated to the outside, effectively avoiding the motor vibration caused by the deformation of the rotor bearing 13 due to overheating of the rotor bearing 13, and at the same time reducing the noise caused by the rotor vibration.

[0023] Embodiment 2 like Figure 3 , Figure 4 , Figure 5 and Figure 7As shown, this embodiment provides another technical solution based on the first embodiment. The wedge-shaped elastic component 62 includes a limiting spring protrusion 621, and the limiting spring protrusion 621 is embedded in the arc-shaped groove 72. The limiting spring protrusion 621 is connected to the rotating sleeve 61 through a spring. The interior of the rotating sleeve 61 is also connected to a spring push rod 622 through a spring. The spring push rod 622 is provided with a wedge-shaped groove 623 that matches the bottom end of the limiting spring protrusion 621, and the outer ends of several wedge-shaped grooves 623 are fixedly connected to connecting rings 624.

[0024] like Figure 3 , Figure 4 , Figure 5 and Figure 7 As shown, a plurality of damping support components 73 are installed inside the driving disk 71. The damping support component 73 includes a lever plate 732 connected to the driving disk 71 by a pin shaft, the outer end pin shaft of the lever plate 732 is connected to the driving rod 731, and the inner end pin shaft of the lever plate 732 is connected to the damping support rod 733. The damping support rod 733 and the driving rod 731 are both connected to the driving disk 71 in a limited sliding manner. When the magnetorheological fluid changes to a high-damping, high-viscosity quasi-solid state, the circulation component 95 cannot slide in the magnetorheological fluid. At this time, the resistance from the circulation component 95 to the driving disk 71 will be much greater than the resistance from the wedge-shaped elastic component 62. At this time, the damping drive assembly 7 cannot rotate with the follow-up assembly 6. Therefore, when the follow-up assembly 6 rotates, the damping drive assembly 7 will be fixed in the variable damping support assembly 9, and the limiting spring protrusion 621 will be The driving disk 71 is squeezed and slides inwardly. During the inward sliding of the limiting spring protrusion 621, the spring push rod 622 is driven to slide backward through the wedge-shaped groove 623, and at the same time, the connecting ring 624 is driven to squeeze the end of the driving rod 731. Driven by the driving rod 731, the end of the lever piece 732 connected to the driving rod 731 rotates, thereby driving the end of the lever piece 732 connected to the damping support rod 733 to rotate downward, thereby driving the end of the damping support rod 733 to be squeezed on the shaft rod. The supporting property of the damping support rod 733 is utilized to prevent the rotor from making a large displacement inside the motor, thereby affecting the normal operation of the motor. In addition, the damping support rod 733 can absorb and consume vibration energy, thereby reducing the vibration amplitude of the rotor. This helps to reduce noise and vibration during motor operation, improve the running stability of the motor, and make the output of the motor more stable.

[0025] Embodiment 3 like Figure 3 , Figure 4 , Figure 8 and Fig.11As shown, this embodiment provides another technical solution based on the first and second embodiments. A thermal deformation component 94 is also installed on the inner wall of the support sleeve 91. The thermal deformation component 94 includes a bimetallic strip 941. The front side of the bimetallic strip 941 is fixedly connected to a liquid pushing piston 942 through a spring. The other end of the liquid pushing piston 942 is placed inside the magnetorheological fluid storage tank 92. The outer wall of the drive disk 71 is rotatably connected to the magnetorheological fluid storage tank 92. When one end of the shaft is stuck, the shaft cannot rotate normally, and the electrical energy cannot be effectively converted into mechanical energy and output to the outside. Output, thereby generating a large amount of heat energy, and this part cannot be effectively dissipated. At this time, the bimetallic strip 941 will deform forward in a directional manner, thereby driving the push piston 942 to push the magnetorheological fluid in the magnetorheological fluid storage tank 92, thereby driving the damping drive assembly 7 to move in the direction of the connecting shaft 12, thereby driving the detachable drive shaft 11 to separate from the shaft portion of the rotor, and finally the detachable drive shaft 11 will be completely merged with the connecting shaft 12. At this time, the rotor shaft is no longer engaged with external devices, thereby ensuring the normal rotation of the rotor shaft and avoiding the problem of external devices being stuck and causing overheating and burning of the motor.

[0026] Working principle: The motor detects the vibration of the rotor assembly 5 during rotation through the rotor vibration detection member 10. When the vibration of the rotor assembly 5 is within the normal range, the magnetorheological fluid stored in the magnetorheological fluid storage tank 92 is in a low-damping fluid state. At this time, as the rotor assembly 5 rotates, it will drive the follow-up assembly 6 to rotate together, and the limit spring protrusion 621 is stuck in the arc-shaped groove 72, so the follow-up assembly 6 will drive the damping drive assembly 7 to rotate together, and the protrusion structure on the drive ring 74 will continuously drive the circulation component 95 to slide up and down through the slide groove 955. When the circulation component 95 moves downward, it will squeeze the magnetorheological fluid storage tank 92. The magnetorheological fluid enters the circulation groove 93 and gathers above the circulation piston 952. When the circulation component 95 moves upward, the one-way opening and closing valve plate 954 opens, allowing the magnetorheological fluid to flow back into the magnetorheological fluid storage groove 92, so that the magnetorheological fluid in the low damping state circulates inside the magnetorheological fluid storage groove 92, and the flowing magnetorheological fluid is used to carry away the heat accumulated on the rotor bearing 13. During the flow of the magnetorheological fluid, it will continuously contact the heat sink 96, so that the heat taken away by the magnetorheological fluid is quickly dissipated to the outside, effectively avoiding the motor vibration caused by the deformation of the rotor bearing 13 due to overheating of the rotor bearing 13, and at the same time reducing the noise caused by the rotor vibration.

[0027] The motor monitors both ends of the shaft of the rotor assembly 5 through the rotor vibration detection component 10. When the shaft begins to vibrate with a large amplitude, it will detect the vibration generated by the shaft and simultaneously feed back the detection signal to the control element in the electrical box 2. After receiving the detection signal from the rotor vibration detection component 10, the control element will turn on the power supply to energize the electromagnetic coil 8. After the electromagnetic coil 8 is energized, a magnetic field will be generated inside it, thereby causing the magnetorheological fluid in the magnetorheological fluid storage tank 92 to change from a low-damping, low-viscosity fluid state to a high-damping, high-viscosity quasi-solid state. The high viscosity of the magnetorheological fluid means that the friction between its molecules increases, making it difficult to flow. This friction will resist the vibration movement of the rotor and convert the mechanical energy of the vibration into heat energy, thereby reducing the vibration energy transmitted to other parts of the motor or the outside world, thereby reducing the generation of vibration noise. The support effect on the rotor bearing 13 is achieved through this change in the damping state.

[0028] When the magnetorheological fluid changes into a high-damping, high-viscosity quasi-solid state, the circulation component 95 cannot slide in the magnetorheological fluid. At this time, the resistance from the circulation component 95 to the drive disk 71 will be much greater than the resistance from the wedge-shaped elastic component 62. At this time, the damping drive component 7 cannot rotate together with the follow-up component 6. Therefore, when the follow-up component 6 rotates, the damping drive component 7 will be fixed in the variable damping support component 9, and the limiting spring protrusion 621 will be squeezed by the drive disk 71 to slide inward. During the inward sliding process of the limiting spring protrusion 621, the spring push rod 622 will be driven to slide backward through the wedge-shaped groove 623, and at the same time, the connecting ring 624 will be squeezed. The end of the driving rod 731 is pressed, and the end of the lever piece 732 connected to the driving rod 731 rotates under the drive of the driving rod 731, thereby driving the end of the lever piece 732 connected to the damping support rod 733 to rotate downward, thereby driving the end of the damping support rod 733 to be squeezed onto the shaft rod, and utilizing the supporting property of the damping support rod 733 to avoid large displacement of the rotor inside the motor, which would affect the normal operation of the motor. In addition, the damping support rod 733 can absorb and consume vibration energy, thereby reducing the vibration amplitude of the rotor. This helps to reduce noise and vibration during motor operation, improve the running stability of the motor, and make the output of the motor more stable.

[0029] It should be noted that the rotation speed of the motor is extremely fast, which means that the speed at which the follower assembly 6 rotates following the rotor shaft is also extremely fast. Therefore, when the limit spring protrusion 621 passes through the arc groove 72, the limit spring protrusion 621 cannot rebound and reset, thereby ensuring the long-term support effect of the damping support rod 733. At the same time, when the magnetorheological fluid returns to a low damping and low viscosity state, the shaft will drive the limit spring protrusion 621 to re-enter the arc groove 72, thereby resetting the damping support rod 733 and no longer supporting the shaft, thereby avoiding the contact friction between the damping support rod 733 and the shaft when the shaft rotates normally later, causing the mechanical energy loss of the shaft.

[0030] When one end of the shaft is stuck, causing the shaft to be unable to rotate normally, electrical energy cannot be effectively converted into mechanical energy and output to the outside, thereby generating a large amount of heat energy, and this part cannot be effectively dissipated. At this time, the bimetallic strip 941 will deform forward in a directional manner, thereby driving the push piston 942 to push the magnetorheological fluid in the magnetorheological fluid storage tank 92, thereby driving the damping drive assembly 7 to move in the direction of the connecting shaft 12, thereby driving the detachable drive shaft 11 to separate from the shaft portion of the rotor, and finally the detachable drive shaft 11 will be completely merged with the connecting shaft 12. At this time, the rotor shaft is no longer engaged with external devices, ensuring the normal rotation of the rotor shaft and avoiding the problem of overheating and burning of the motor caused by external devices being stuck.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-noise motor, comprising a motor housing (1), a power connection box (2) mounted on the top of the motor housing (1), a stator assembly (4) mounted on the inner side wall of the motor housing (1), a rotor bearing (13) arranged at the center of the front and rear side walls of the motor housing (1), and a rotor assembly (5) mounted on the inner shafts of two rotor bearings (13), characterized in that: A variable damping support assembly (9) is installed at the center of the front and rear side walls of the motor housing (1). The variable damping support assembly (9) comprises a support sleeve (91) installed on the outer wall of the motor housing (1). The two rotor bearings (13) are respectively installed at the centers of the two support sleeves (91). A magnetorheological fluid storage tank (92) for storing magnetorheological fluid is provided inside the support sleeve (91). A plurality of connecting pieces (97) are fixedly connected inside the magnetorheological fluid storage tank (92). The magnetorheological fluid stored inside the magnetorheological fluid storage tank (92) passes through the plurality of connecting pieces (97) and contacts the rotor bearing (13). An electromagnetic coil (8) is arranged between the motor housing (1) and the variable damping support assembly (9). The input and output ends of the electromagnetic coil (8) are both connected to power supply lines (3). The power supply lines (3) are connected to the power connection box (2). A plurality of groups of rotor vibration detection components (10) are arranged outside the shaft of the rotor assembly (5). Both ends of the shaft of the rotor assembly (5) are slidably connected to a detachable drive shaft (11), the other end of the detachable drive shaft (11) is slidably connected to a connecting shaft (12), a follow-up assembly (6) is fixedly connected to the outer wall of the detachable drive shaft (11), and a damping drive assembly (7) is provided between the follow-up assembly (6) and the variable damping support assembly (9).

2. A low noise motor according to claim 1, characterized in that: The rotor vibration detection element (10) is preferably at least two groups of photoelectric acceleration sensors, wherein one group of photoelectric acceleration sensors is arranged on the longitudinal axis of the rotor assembly (5), and the other group of photoelectric acceleration sensors is arranged on the transverse axis of the rotor assembly (5), and the rotor vibration detection element (10) is electrically connected to the electrical connection box (2).

3. A low noise motor according to claim 1, characterized in that: The following-rotating assembly (6) comprises a following-rotating sleeve (61), in which a plurality of wedge-shaped elastic components (62) distributed in a circular array are installed. The damping drive assembly (7) comprises a driving disk (71), and a plurality of arc-shaped grooves (72) matching with the wedge-shaped elastic components (62) are formed on a surface of the driving disk (71) in contact with the following-rotating sleeve (61). A driving ring (74) is fixedly connected to the front side wall of the driving disk (71). The magnetorheological fluid storage tank (92) A circulation component (95) is installed inside the circulation component (95), the circulation component (95) comprising a fixing plate (951), the lower side wall of the fixing plate (951) being fixedly connected to a circulation piston (952) via a spring, a circulation flow channel (953) being provided inside the circulation piston (952), a one-way opening and closing valve plate (954) that opens downward in one direction being installed inside the circulation flow channel (953), and a slide groove (955) that cooperates with the drive ring (74) being provided on the outer side wall of the circulation piston (952).

4. A low noise motor according to claim 3, characterized in that: A circulation groove (93) for connecting the inner and outer ends of the magnetorheological fluid storage groove (92) is provided inside the support sleeve (91), and a heat sink (96) is also installed inside the support sleeve (91), one end of the heat sink (96) is placed inside the circulation groove (93), and the other end of the heat sink (96) is in contact with the outer wall of the motor housing (1).

5. A low noise motor according to claim 3, characterized in that: The wedge-shaped elastic component (62) comprises a limiting spring protrusion (621), the limiting spring protrusion (621) is embedded in the arc-shaped groove (72), the limiting spring protrusion (621) is connected to the rotating sleeve (61) via a spring, the interior of the rotating sleeve (61) is also connected to a spring push rod (622) via a spring, the spring push rod (622) is provided with a wedge-shaped groove (623) that fits with the bottom end of the limiting spring protrusion (621), and the outer ends of a plurality of the wedge-shaped grooves (623) are fixedly connected to connecting rings (624).

6. A low noise motor according to claim 3, characterized in that: A plurality of damping support components (73) are installed inside the driving disk (71), and the damping support component (73) comprises a lever sheet (732) connected to the inside of the driving disk (71) by a pin shaft, the outer end pin shaft of the lever sheet (732) is connected to the driving rod (731), the inner end pin shaft of the lever sheet (732) is connected to the damping support rod (733), and the damping support rod (733) and the driving rod (731) are both connected to the inside of the driving disk (71) in a limited sliding manner.

7. A low noise motor according to claim 3, characterized in that: A thermal deformation component (94) is also mounted on the inner side wall of the support sleeve (91), the thermal deformation component (94) comprising a bimetallic strip (941), the front side of the bimetallic strip (941) being fixedly connected to a liquid pushing piston (942) via a spring, the other end of the liquid pushing piston (942) being disposed inside the magnetorheological fluid storage tank (92).

8. A low noise motor according to claim 3, characterized in that: The outer side wall of the driving disk (71) is rotatably connected to the magnetorheological fluid storage tank (92).

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