16results about How to "Improve torque performance" patented technology

The invention discloses a thrombus excision system. An embolus is extracted through a mechanical embolus extraction device, a blood vessel is dredged, and revascularization of the blood vessel is achieved. A saccule guide catheter is put at the near end of the embolus part when the embolus is extracted, blood flow is temporarily blocked, and thus a fine crushed embolus generated in the embolus extraction process is prevented from being flushed to the far end of the blood vessel; meanwhile, for a relatively large embolus, a part of thrombus can also be sucked by virtue of the saccule guide catheter, and then the residual thrombus can be extracted by virtue of a thrombus exsector. The thrombus exsector, the saccule guide catheter and a delivery microcatheter are arranged on the thrombus excision system disclosed by the invention, wherein the thrombus exsector is used as a main component, an excision spring is arranged, and the release state of the excision spring is a conical spiral state. Compared with the prior art, the thrombus excision system has the advantages that the thrombus exsector is very soft, the minimal through size is 0.014' (0.36mm), the thrombus exsector can easily enter a cerebral vessel, a near-end protection technology is adopted in the operation process, and thrombus suction is combined with mechanical embolus extraction, so that the success rate of the operation is improved, and the complications are reduced.

The invention discloses a magnetic pole optimization method for reducing torque ripple of a permanent magnet synchronous motor. The magnetic pole optimization method comprises the following steps: step 1, analyzing a stator magnetomotive force and a stepped permanent magnet excitation magnetic potential during load operation by using an analytical method; step 2, obtaining air gap flux density harmonic amplitudes and orders respectively generated by the armature magnetic potential and the permanent magnet excitation magnetic potential; 3, solving a resultant magnetic field under the combined action of the permanent magnet and the armature magnetic potential, calculating the total output torque during load operation, and obtaining the relation between the working harmonic wave and the average output torque and the torque pulsation; and 4, based on the relationship between the working harmonic waves of the magnetic field and the output torque, the air gap flux density amplitude of the order related to the average torque is kept unchanged by adjusting the parameters of the stepped magnetic poles, and the air gap flux density amplitude of the order related to the torque pulsation is reduced. The motor obtained through the method can output the expected average torque, meanwhile, the torque pulsation is reduced, and the better torque performance is achieved; and good economic benefits can be generated.

The invention belongs to the technical field of continuum robots, and discloses a variable-rigidity and driving combined continuum robot and an optimization design method thereof.The variable-rigidity and driving combined continuum robot comprises a second section, a middle transition section, a first section, a first section rope and a second section rope, and the second section and the first section are connected through the middle transition section; each of the second section and the first section comprises a plurality of wire guiding discs and a plurality of check rings, every two adjacent wire guiding discs are connected through the corresponding check ring to form a cylindrical pair joint, and the four first section ropes and the four second section ropes are evenly distributed relative to the center line of the continuum robot; the four first section ropes are used for driving two mutually perpendicular degrees of freedom of the first section, the four second section ropes are used for driving two mutually perpendicular degrees of freedom of the second section, and the second section and the first section move independently. The continuum robot does not need to be assembled, is flexible in movement, controllable in rigidity and small in friction force, and improves the interaction and sensing ability with the environment during operation.

The present invention discloses a low-vibration rotor modulation slot of a built-in integer slot motor and a design method thereof, determines the motor size parameters, performs electromagnetic modeling, simulates the air gap flux density waveform under the no-load operation condition of the motor, and solves the radial electromagnetic force; simulates the radial electromagnetic force distribution under the no-load operation condition of the motor, collects the radial electromagnetic force under the no-load operation condition; simulates the three-dimensional modal frequency of the motor, and calculates the modal frequencies of each order; based on the radial electromagnetic force and modal frequencies of each order under the no-load operation condition, simulates the vibration acceleration response of the motor under the no-load operation condition, and determines the radial electromagnetic force optimization target: constructs a tooth number order static modulation function, designs the rotor modulation slot, and when the waveforms of the actual static modulation function and the ideal static modulation function are infinitely close, the radial electromagnetic force is minimum. The method of the present invention is easy to process, has strong pertinence, and significantly improves the vibration effect of the motor.

The invention relates to the technical field of motors, and provides a stepping motor which comprises a first cover plate, a second cover plate, a rotor assembly and a stator assembly, the rotor assembly comprises a rotating shaft and magnetic steel fixedly arranged on the rotating shaft in a sleeving mode. The stator assembly comprises a first claw pole, a second claw pole and solenoids arranged on the two opposite sides of the rotating shaft. The first claw pole and the second claw pole are respectively sleeved on the rotor assembly and are separated from the magnetic steel; the solenoid comprises an iron core and a coil fixedly sleeved on the iron core, and two opposite ends of the iron core along the axial direction of the rotating shaft are respectively fixed on the first cover plate and the second cover plate; the stepping motor further comprises a reduction gearbox assembly, the reduction gearbox assembly is fixed to the side, away from the second cover plate, of the shell, and the output end of the rotating shaft is connected with the reduction gearbox assembly. The orthographic projection of the reduction gearbox assembly to the first cover plate completely falls into the range of the first cover plate. Compared with the prior art, the stepping motor provided by the invention can realize ultrathin design and good torque performance.

Provided is an oil well metal pipe having excellent high torque performance. This oil well metal pipe (1) is provided with a pipe body (10). The pipe main body (10) comprises a male buckle part (40) and a female buckle part (50). The pin portion (40) has a pin portion contact surface (400) including a male thread portion (41). The female portion (50) has a female portion contact surface (500) including an internally threaded portion (51). The oil well metal pipe (1) is further provided with a resin film (100) which is formed as the uppermost layer of the pin contact surface (400) and / or the box contact surface (500). The resin coating (100) contains an epoxy resin. When the resin coating (100) is measured by a 1H pulse NMR method and the obtained free induction decay signal is divided into three components, namely, a high-motility component, a medium-motility component, and a low-motility component, in this order from a component having a long spin-spin relaxation time (T2), the weighted average of the spin-spin relaxation time (T2) of the three components is 110.0 [mu] s or less.

The present invention provides a stepper motor, which includes a rotating shaft, a magnetic steel fixed to the outer peripheral side of the rotating shaft, and a winding unit sleeved on the rotating shaft and rotatably connected with the rotating shaft, the winding unit includes at least one winding and is spaced apart from the magnetic steel, and each of the windings is spaced apart from the magnetic steel; each winding includes a shell sleeved on the rotating shaft, a frame fixed to the shell, two first claw poles fixed to the two ends of the shell, two second claw poles fixed to the middle area of ​​the frame, and two coils wound around the frame and spaced apart; the opposite sides of the shell in each winding are provided with notches penetrating its side walls. The stepper motor in the present invention can increase the effective volume of the entire magnetic circuit, and the torque performance can also be improved by about 15%.

The present invention discloses an optical fiber rotating device, including two transmission belts, both of which are driven to rotate by transmission pulleys, the surfaces of the two transmission belts are arranged opposite to each other and the two adjacent surfaces are used to abut against and clamp the optical fiber, and the two transmission belts are arranged in an X shape; and also discloses an optical fiber drawing system, including a graphite furnace, a bare fiber diameter measuring unit, a coating unit, a curing unit, a coating diameter measuring unit, a traction unit, a tension screening unit and a take-up unit arranged in sequence, and an optical fiber rotating device is arranged between the graphite furnace and the bare fiber diameter measuring unit. The present invention can effectively rotate the optical fiber, has a stable and reliable structure, and has high quality of finished products.

The application relates to the technical field of mechanical transmission and magnetic transmission, and discloses a pull rope permanent magnet composite coupling, which comprises a permanent magnet magnetic coupling unit, a pull rope flexible unit and a bearing isolation positioning unit; the permanent magnet magnetic coupling unit comprises an inner magnetic rotor and an outer magnetic rotor which are coupled to each other, the outer magnetic rotor is located outside the inner magnetic rotor, and a coupling air gap is formed between the inner magnetic rotor and the outer magnetic rotor; the pull rope flexible unit is provided with at least one group, and the pull rope flexible unit is internally provided with pull rope structures which are arranged in a circumferential array; the bearing isolation positioning unit is installed between the inner magnetic rotor and the outer magnetic rotor; wherein the end portions of the inner magnetic rotor and / or the outer magnetic rotor are provided with the pull rope flexible unit. The application can realize compliant compensation for radial, axial and angular deviations, can also realize protection of a motor, a speed reducer and a load, can significantly improve coupling torque and torque density, can reduce material and processing costs and can save installation space.

The utility model provides a combined highway subgrade gravel pile and relates to the technical field of CN214194485U. The combined highway subgrade gravel pile comprises a vibroflot main body and a flange, convex teeth are arranged on the surface of the vibroflot main body, the vibroflot main body and the convex teeth are connected in a welding mode, a centrifugal shaft main body is arranged at the bottom of the vibroflot main body, and the vibroflot main body and the centrifugal shaft main body are connected in a tight sliding mode. The spiral blades are arranged on the surface of the centrifugal shaft body, the centrifugal shaft body and the spiral blades are connected in a seamless welding mode, the six-edge plum blossom-shaped structure is adopted for the head of the guide rod, the vibroflotation blades are additionally arranged, and the spiral blades are arranged on the surface of the centrifugal shaft body, so that the comprehensive performance is improved, the adaptability is enhanced, and the centrifugal shaft is suitable for viscous or water-containing soil layers; the failure rate is reduced through structure optimization, efficient hole forming, continuous dumping and stable vibration are achieved through cooperation of the mechanical advantages of the six-edge structure, the crushing capacity of the vibroflotation blades and the dumping function of the spiral blades, and the six-edge vibroflotation machine is particularly suitable for engineering construction under the complex geological condition.

The present application belongs to the technical field of double three-phase magnetic type permanent magnet synchronous motor, in order to solve the problem of existing double three-phase magnetic type permanent magnet synchronous motor torque quantitative analysis limit, the double three-phase magnetic type permanent magnet synchronous motor torque quantitative analysis method and system are proposed, according to the double three-phase magnetic type permanent magnet synchronous motor stator side modulation function and permanent magnet initial magnetic motive force function model, the double three-phase magnetic type permanent magnet synchronous motor no-load air gap magnetic density is calculated;According to the double three-phase magnetic type permanent magnet synchronous motor rotor side modulation function model, stator side modulation function and armature magnetic motive force, the double three-phase magnetic type permanent magnet synchronous motor armature air gap magnetic density is calculated;According to the double three-phase magnetic type permanent magnet synchronous motor no-load air gap magnetic density and armature air gap magnetic density, the synthesized radial air gap magnetic density and tangential air gap magnetic density are determined, and then the contribution degree of harmonic to motor electromagnetic torque is quantified.

The present invention provides a stepper motor, which includes two clamping plates arranged opposite to each other, a rotating shaft supported at both ends by the two clamping plates, a magnetic steel sleeved and fixed on the outer peripheral side of the rotating shaft, and a stator unit sleeved on the rotating shaft; the stator unit includes a plurality of windings, and the plurality of windings are clamped and fixed between the two clamping plates; each winding includes two claw poles sleeved and arranged opposite to each other on the rotating shaft, and at least two solenoids fixed between the two claw poles and spaced from each other, and the solenoids are spaced and arranged on opposite sides of the magnetic steel along the circumference of the rotating shaft; each solenoid includes an iron core fixed between the two claw poles and a coil wound on the outer peripheral side of the iron core; the axes of the coils arranged opposite to each other along the axial direction of the rotating shaft in each winding overlap each other. The stepper motor in the present invention can further reduce its width dimension to achieve the thinnest design of the stepper motor.

The utility model discloses a novel agricultural tire of anti -explosion bead structure design relates to tire technical field, including tire body, the bead in tire body is equipped with by single steel wire winding generation's big inclined bottom hexagonal bead, big inclined bottom hexagonal bead outside is equipped with the layer of reinforced rubber sheet, the layer of reinforced rubber sheet outside is equipped with inner wrapping cloth, the upper side of inner wrapping cloth is equipped with triangular rubber core, steel wire wrapping cloth is equipped in triangular rubber core and inner wrapping cloth outside still, the utility model discloses a single steel wire winding's big inclined bottom hexagonal bead and the layer of reinforced rubber sheet, promote the strength of bead, increase the contact area with the rim, optimize stress distribution, enhance steel wire adhesion, reduce the heat of friction, thereby prevent the bead crack and steel wire to stick out, have excellent anti -bead twist effect simultaneously, can effectively improve the hoop pressure between bead and rim, avoid the slip between bead and rim.

The application relates to the motor technical field and discloses a flat wire short-pitch wave winding structure, which comprises a three-phase flat wire winding structure embedded in a plurality of stator slots of a permanent magnet motor stator; the three-phase flat wire winding structure comprises U, V and W three-phase winding structures; each stator slot has 2r (r belongs to N*) layers of flat copper conductors; each branch of each phase of the U, V and W three phases comprises r parts; for the flat copper conductor coils of the first part to the rth part, there is 1 slot misplacement between the stator slots where the adjacent flat copper conductor coils are located; the flat wire short-pitch wave winding structure realizes the short-pitch effect.

The invention belongs to the technical field of permanent magnet servo motors, and particularly discloses a rotor, magnetizing equipment, a servo motor and a structural parameter optimization method of the servo motor. According to the invention, the overall magnetizing technology of assembling the magnetic steel first and then magnetizing is adopted, the non-magnetized permanent magnet blocks are assembled on the rotor, and the whole rotor is magnetized through the pulsed high-intensity magnetic field equipment, so that the assembling difficulty is reduced, and the assembling precision is improved. Compared with a traditional servo motor adopting a Halbach array, the Halbach array servo motor can obtain better performance under the condition of the same permanent magnet consumption, and is easy to process and manufacture. Based on an optimization result of a theoretical model, a finite element method is adopted to carry out more accurate optimization, and design parameters better than a Halbach array are obtained. On the premise that the number of the permanent magnets is not changed, the torque of the discrete magnetizing permanent magnet motor is remarkably increased, and the torque pulsation is remarkably reduced, so that the discrete magnetizing permanent magnet motor has higher competitiveness in the field of servo motors or more occasions and is expected to be a low-cost alternative scheme of the permanent magnet motor.

The invention relates to the technical field of motor design, and particularly discloses a high-torque magnetic field modulation permanent magnet motor design method and electronic equipment, the high-torque magnetic field modulation permanent magnet motor design method comprises the following steps: determining no-load back electromotive force as a key parameter influencing a motor output torque according to an analytic expression of the motor output torque; a no-load back electromotive force analytic expression is derived and substituted into a motor output torque analytic expression, the output torque is decomposed into a product of a plurality of correlation coefficients, and the internal relation between the coefficients and motor topology design parameters is studied. According to the high-torque magnetic field modulation permanent magnet motor design method and the electronic equipment, the output torque of the motor can be decomposed into the product of the correlation coefficients, the target of analyzing and improving the output torque of the motor is specifically decomposed into the improvement of the correlation coefficients, and the improvement of the output torque of the motor is realized by researching the key coefficient analytic expression influencing the output torque of the motor. And the rule that the key coefficient changes along with design parameters is studied, and finally the motor topology design with the torque performance remarkably improved is formed.