47results about How to "High power density ratio" patented technology

The invention relates to the motor technology field, more particularly to an integrated driving motor without a position sensor. The driving motor is provided with a motor; and the motor is composed of a stator, an external rotor, a rotor spindle, and an end cover. The driving motor is characterized in that: a driver is arranged in the motor and is fixedly connected with the end cover; the end cover and the stator of the motor are mutually connected to form an integral body so as to strengthen heat radiation capability of a module; the driver is composed of a power plate and a control plate; the power plate is provided with a major loop, an inlet wire open-phase detection circuit, a bus current detection circuit, an under-voltage and over-voltage detection circuit, a counter-electromotive force detection circuit and a switch power supply circuit; and the control plate is provided with a DSP control system circuit and a communication module circuit. According to the invention, on the basis of the above-mentioned structure, the driving motor has advantages of compact structure, high-density power, high efficiency, low noise, high integrated level, and low cost and the like.

The invention provides a charging and discharging type DC-DC conversion circuit. When an energy storing device is charged, alternate switching-on control is performed on a first switching tube and a second switching tube, the energy storing device is charged by a synchronous ratification BUCK circuit which is composed of a first semi-conductor switching tube, the first switching tube, the second switching tube, a coupled inductor L and a capacitor C2, and meanwhile, a load is powered by a first winding, a second semi-conductor switch and a capacitor C3 of the magnetically integrated coupled inductor L; when the energy storing device is discharged, the anode of the energy storing device outputs DC to supply power to the load through a high-step-up-ratio BOOST circuit which is composed of the coupled inductor L, the second switching tube, the second semi-conductor switch and the capacitor C3, active clamping is performed on the voltage peak produced by the input end of the second switching tube through the first switching tube and the capacitor C1, and electric energy in the capacitor C1 is fed back to the energy storing device for charging when the voltage of the capacitor C1 reaches a preset voltage value, so that the conversion efficiency, the utilization rate and the power density ration of DC are improved, and costs are reduced.

The invention relates to the technical field of engines, and particularly relates to a high-integration fuel cell engine system which solves a problem of poor integration of the engine system becausefuel cells are restricted by various finished products with a fixed shape in the prior art. The high-integration fuel cell engine system comprises an engine integrated frame shell and an air system, ahydrogen system, a hydrothermal circulation system, an electrical system, an electric pile and a fluid distribution manifold which are installed in the engine integrated frame shell, wherein the airsystem includes an air intake filter assembly, an air compressor assembly, an intercooler assembly, an air humidification assembly, an intake and exhaust control valve assembly and an air tail exhaustassembly. The fuel cell engine system has the advantages of high integrated design reliability, good stability, compact system structure, high power density ratio and high space utilization ratio ofcomponents, is convenient for matching the engine system with different vehicle models, can satisfy the space layout of various types of vehicles, facilitates the space allocation of finished vehiclesand brings benefits to the replacement and maintenance of components.

The invention discloses a wearable flexible lower limb exoskeleton based on negative pressure rotation pneumatic artificial muscle. The wearable flexible lower limb exoskeleton comprises a portable control and power system and a wearable flexible assistance system; the wearable flexible lower limb exoskeleton mainly adopts the negative pressure rotation pneumatic artificial muscle as a core driving component, rotational motion is generated under the negative pressure effect, rotating bending torque is supplied, after negative pressure disappears, stretching restoring force is generated, and stretching torque is supplied. The portable control and power system processes user gait data in real time and controls gas circuit switching and gas pressure between the negative pressure rotation pneumatic artificial muscle in the wearable flexible assistance system and a negative pressure power source in real time, wherein the user gait data is collected and fed back by an inertia measuring unit,real-time pressure control is performed on a corresponding negative pressure rotating pneumatic artificial muscle driver on the wearable flexible assistance system, in the walking process, torque helping shanks to swing relative to thighs is supplied to left and right legs in real time, and the purposes of walking assistance and lower limb rehabilitation training are achieved.

The invention discloses a flexible exoskeleton robot for assisting motion of hip joints and knee joints. The robot comprises a pneumatic control system, a left leg hip joint flexible assistance assembly, a right leg hip joint flexible assistance assembly, a left leg knee joint flexible assistance assembly, a right leg knee joint flexible assistance assembly and the like. Negative-pressure contraction elastomer drivers are adopted as driving elements of the left leg hip joint flexible assistance assembly and the right leg hip joint flexible assistance assembly and form linear displacement and elastic application force under a negative pressure effect; negative-pressure rotation elastomers are adopted as driving elements of the left leg knee joint flexible assistance assembly and the right leg knee joint flexible assistance assembly and generate rotation torque under the negative pressure effect. The pneumatic control system processes user gait data collected and fed back by a detectionand information sending module in real time, controls the negative-pressure loading and unloading process of the negative-pressure contraction elastomer drivers and the negative-pressure rotation elastomers in real time and provides assistance for the hip joints and the knee joints according to a gait rule in the walking process.

The invention provides a bender hydraulic system which has simple structure, reliable control and back pressure being capable of being adjusted at will, aiming at solving the problems that an unloading circuit of the traditional bender hydraulic control system is more complex, back pressure control stability is low, a valve group is troublesome to mount, a product is heavy and power density ratio is low. The bender hydraulic system provided by the invention comprises an oil pump, an oil tank, a three-position three-way reversing valve, wherein a charging valve is connected between the oil tank and the upper cavity of a cylinder; the oil outlet of the oil pump is connected with the oil tank by virtue of a two-way cartridge valve; the port P of the three-position four-way reversing valve 30 is connected with the oil outlet of the oil pump, the port B of the three-position four-way reversing valve 30 is connected with the lower cavity of the cylinder by virtue of a first electromagnetic directional valve 40; the port B is also connected with the control port of the charging valve; the port A of the three-position four-way reversing valve 30 is connected with the upper cavity of the cylinder by virtue of a throttling check valve 20; and the port B is also connected with the lower cavity of the cylinder by virtue of a second electromagnetic directional valve 50 and a throttling valve 60.

The invention relates to a flexible rotor of an ultrahigh-rotating-speed liquid hydrogen turbine pump. The flexible rotor comprises a screw (1), an inducer (2), a compression nut (3), a shaft (4), a primary centrifugal wheel (5), a metal rubber damper (6), a squirrel-cage elastic support (7), a bearing pair (8), an interstage shaft sleeve (9), a secondary centrifugal wheel (10), a balance piston (11), a metal rubber damper baffle (12), a first shaft sleeve (13), a turbine disc (14), a large nut (15), a preloaded disc spring (16) and a second shaft sleeve (17). The shaft system of the flexiblerotor extends outwards in two directions, connection and torque transmission structures are optimized, the mass of the rotor is reduced, cantilevers on the two sides and the supporting span are shortened, supercritical work is achieved, the rated rotating speed reaches 80000 rpm, the critical rotating speed margin is 20% or above, and meanwhile the flexible rotor has 60%-100% variable working condition and axial force self-adaptive balance capacity.

The invention relates to a vertical-mill gearbox with a pure-sliding bearing configuration structure. The vertical-mill gearbox comprises a box body, an input-stage bevel gear pair, a second-stage parallel-axis cylindrical gear pair, an output-stage planetary gear and an output flange; the output flange is supported through a set of tilting-pad thrust sliding bearings; other motion parts are supported by sliding bearings. The vertical-mill gearbox has the advantages that all stages of driving gear parts and driving parts of the gearbox adopt the sliding bearing configuration support structure, and sliding bearing support is high in bearing capacity, long in service life, high in cost performance, short in delivery time, good in maintenance performance and the like; lubricating oil films of the sliding bearings feature in providing damping for rotating parts and restricting vibration, running steadiness and bearing capacity of the gearbox can be improved, all the sliding bearings adopt forced lubrication, and an entire machine is higher in reliability; the entire structure can be more compact by the aid of the sliding bearing configuration support structure, the entire machine is downsized and reduced in weight, and power density ratio of the gearbox is increased.

The invention provides an integrated electro-hydraulic servo rotary actuator which is characterized in that a hydraulic execution element, a hydraulic control element, a hydraulic power element, a sensor, a motor and a control system are modularly and integrally arranged, so that the power density ratio and the power volume ratio can be greatly improved, the system can be simplified, and system installation control, online real-time monitoring and intelligent protection are facilitated. The integrated electro-hydraulic servo rotary actuator comprises a spiral oscillating cylinder, an integrated motor pump, an integrated valve block, an energy accumulator, a controller and an RVDT angle sensor, the spiral oscillating cylinder comprises a cylinder body, an output shaft and a piston, the piston and the output shaft are arranged in an inner cavity of the cylinder body, the piston is connected with corresponding first meshing inner teeth of the inner cavity of the cylinder body in a meshing manner through outer spiral teeth, the outer cylindrical surface of the piston is in clearance fit with the annular surface of the inner wall of the inner cavity of the cylinder body, and the connecting end of the output shaft is meshed with inner spiral left teeth of a positioning cavity of the piston through outer spiral left teeth.

The invention discloses a fan-out-shaped packaging structure of a large power MOSFET. The structure comprises a ceramic double-sided copper-clad substrate, a gold-plated layer, a single MOSFET chip formed after carrying out scribing on a large power MOSFET wafer and solder balls which are successively arranged from bottom to top. The ceramic double-sided copper-clad substrate is provided with a lower embedded groove used for internally placing the single MOSFET chip. The single MOSFET chip is provided with a grid electrode, a source electrode and a drain electrode. The solder balls comprise first solder balls, a second solder ball, a third solder ball and a fourth solder ball. The first solder balls are located on two sides outside the lower embedded groove and are contacted with the gold-plated layer so as to lead out the drain electrode of a finished product. The second solder ball is located on the grid electrode and is used for leading out the grid electrode of the finished product. The third solder ball and the fourth solder ball are located on the source electrode and are used for leading out the source electrode of the finished product. The invention also discloses a manufacturing technology of the fan-out-shaped packaging structure of the large power MOSFET. In the invention, a lower internal resistance, a smaller stray parameter, better cooling performance and a largerpower density ratio of the MOSFET can be realized, simultaneously the structure and the technology are suitable for large scale mass production, and production cost is reduced.

The invention discloses a flexible hip joint assistance exoskeleton. The flexible hip joint assistance exoskeleton comprises a negative pressure control system, a hip joint flexible assistance assembly and an inertia measuring unit assembly. The hip joint flexible assistance assembly adopts a negative pressure retraction elastomer driver as a hip joint assistance actuator; the negative pressure retraction elastomer driver can receive negative pressure input and unloading of the negative pressure control system; when negative pressure is input, linear displacement becomes shorter, and tension is obtained; when negative pressure is unloaded, in the process when the self-reaction state is recovered to the self-natural state, reverse linear displacement and restoring force are obtained. The negative pressure control system processes user gait data in real time, wherein the data is collected and fed back by the inertia measuring unit assembly, the negative pressure input and unloading process of the negative pressure retraction elastomer driver in the hip joint flexible assistance assembly is controlled in real time, assistance is provided for the hip joint of a user according to the gait rule in the walking process, and the walking assistance purpose is achieved.

The invention provides a power module capacitor layout method. The power module capacitor layout method comprises the following steps: S1, selecting a capacitor core group, a driver and an MOSFET device, wherein the MOSFET device is an SIC MOSFET device; S2, setting the MOSFET device, the driver and the capacitor core group from bottom to top in sequence, wherein a gap is formed between the capacitor core group and the driver, the capacitor core group is electrically connected with the MOSFET device and is arranged above the MOSFET device, and the driver is installed and fixed through auxiliary terminals welded to the MOSFET device; and S3, filling the SIC MOSFET device, the driver and the capacitor core group. Through the technical scheme, an epoxy resin integral filling mode is adopted,due to the fact that the structure that capacitor cores and the power device are connected in layout is optimized, the stray inductance is reduced, and the application condition of the SIC MOSFET power device with higher switching speed is met.

The invention discloses a multivariable feedback linearization control method for a variable frequency pump controlled motor speed adjustment system. Based on comprehensive analysis over operating characteristics of a permanent magnet synchronous motor, a multivariable feedback linearization control strategy for the variable frequency pump controlled motor speed adjustment system is put forward from a decoupling control angle; a mathematical model is built, an original nonlinear system is mapped to a simple linear system via accurate feedback linearization after system feedback linearization conditions are determined, and therefore system decoupling control is realized; poles of the system can be configured on a complex plane according to requirements, and static and dynamic performance of the system can be improved. The control strategy put forward in the invention is high in robustness against load disturbance and has control effects of short response time and high speed tracking precision; the control strategy is suitable for the variable frequency pump controlled motor speed adjustment system.

The invention discloses a swash plate of a novel hydrostatic supporting structure. The swash plate is rotationally fixed into a closed pump through a DU bearing. The closed pump is internally providedwith a plunger sliding shoe assembly arranged around a rotation shaft of the closed pump in the circumferential direction. The swash plate is provided with a swash plate work face making contact withthe plunger sliding shoe assembly and a swash plate runway making contact with the DU bearing. An oil inlet hole is formed in the swash plate work face, and an oil outlet hole is formed in the swashplate runway. The oil inlet hole communicates with the oil outlet hole through an oil way pipeline. The lubricating oil enters from the oil inlet hole to the oil outlet and overflows, and accordinglyoil film lubrication can be formed on the swash plate runway, making contact with the DU bearing, of the swash plate. According to the swash plate, through the arrangement of the oil inlet hole, the oil outlet hole and the arrangement of a pressure one-way valve in the oil way pipeline communicating with the oil inlet hole and the oil outlet hole, and the problem about oil film lubrication betweenthe closed pump swash plate and the DU bearing is solved; and meanwhile, the swash plate runway is provided with a texturing area so that establishing of a lubricating oil film can be facilitated, and the problems of friction losses and swash plate runway abrasion are further solved.

The invention provides a gear box for a wind power jigger and the jigger. The gear box for the wind power jigger comprises a first shell, a second shell, a first false planetary transmission mechanism and a second planetary transmission mechanism. The first housing has an input end assembly. The second housing has an output end assembly. The first false planetary transmission mechanism is arranged in the input end assembly and used for being in transmission connection with a motor capable of inputting torque. The second planetary transmission mechanism is arranged in the output end assembly, the first false planetary transmission mechanism is in transmission connection with the second planetary transmission mechanism, and the second planetary transmission mechanism is used for being connected with a wind power main gear box, so that torque input by the motor is transmitted to the wind power main gear box. On the premise that high power and large torque are met, the structure is compact, the size is small, the weight is light, disassembly and assembly are convenient, the operation difficulty is low, fan installation and overhaul operation is facilitated, efficiency is improved, and operation cost is reduced.

The invention discloses an SMA (shape memory alloy) driven two-degree freedom human eye simulation mechanism. The SMA driven two-degree freedom human eye simulation mechanism mainly comprises two left-and-right driving mechanisms, an upper-and-lower driving mechanism and two middle connecting pieces, wherein simulated human eyeballs are installed on the middle connecting pieces, the left-and-rightdriving mechanisms drive the corresponding middle connecting pieces to rotate leftwards and rightwards respectively, and the upper-and-lower driving mechanism drives the two middle connecting piecesto rotate up and down simultaneously. The two left-and-right driving mechanisms and the upper-and-lower driving mechanism adopt three pairs of SMA driving springs for driving, SMAs are high in power density ratio, low in driving voltage, small in volume and low in noise, and the requirements of reducing the volume and simulating the head of human can be satisfied under the situation that driving force / torque is met. Through transmission of transmission devices in two directions, up-and-down and left-and-right movement of the eyeballs can be realized, and two-degree freedom motion is completed. The SMA driven two-degree freedom human eye simulation mechanism can be applied to occasions and scenes of man-machine interaction such as facial expression robots, human head simulation robots andservice robots.

A multi-rotor motor or generator, including a first rotor, a connecting rod, a second rotor, and an eccentric member, the eccentric member is arranged on a frame, the first rotor is rotatably arranged on the frame, and the connecting rod One end of the connecting rod is rotatably set on the first rotor, the other end of the connecting rod is rotatably set on the second rotor, the second rotor is rotatably set on the eccentric member, and a magnetic pole is set on the second rotor . The multi-rotor motor or generator of the present invention relates to the field of motor or generator equipment, and is different from the existing motor or generator in which the magnetic poles are respectively arranged on the stator and the rotor. The magnetic poles of the present invention are all arranged on the rotor. The present invention The advantages of the motor or generator are light weight, small size, wide range of high-efficiency working range, high electromechanical conversion efficiency, and large power density ratio.

The invention discloses a modularized rolling mill speed reducer, and relates to the technical field of speed reducers. The modularized rolling mill speed reducer comprises an input transmission module, a planetary transmission module, a rolling transmission module and a foundation mounting module; an input gear shaft, an intermediate gear and a first connecting shaft are arranged in the input transmission module; the input gear shaft is meshed with the intermediate gear; a second connecting shaft is arranged in the planetary transmission module; the planetary transmission module is detachablyconnected with the input transmission module; an output shaft is arranged in the rolling transmission module; and the rolling transmission module and the planetary transmission module are detachablyconnected together. The modularized rolling mill speed reducer is formed by assembling the input transmission module, the planetary transmission module, the rolling transmission module and the foundation installation module; parts between the modules have high universality and high interchangeability; and therefore, the modularized rolling mill speed reducer has the advantages of the power densityratio is high, the maintenance cost is low, maintenance time is short, and the reliability of each module is not reduced under external impact load.