34results about How to "High power to volume ratio" patented technology

A power generator with high power-to-volume ratio includes a plurality of silicon steel plates and air gaps or plastic plates, which are alternately arranged to form adjacent magnetic paths of a stator and a mover or a rotor of a power generator and which have intervals (which are defined by thickness or width of the silicon steel plates or the air gaps or the plastic plates) that are set to be very small, whereby when the mover or the rotor take a movement or rotation by one interval, magnetic flux induced in a magnetic path of the stator around which an induction coil is wound changes magnitude and direction thereof so that through quick changes, the induction coil induces a higher voltage and thus significantly increases power-to-volume ratio of the generator.

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 discloses a wireless transmission subsystem for VLF through-the-earth communication, comprising a transmitter and a receiver. The transmitter first adaptively encodes and modulates speech codes and short messages or data to obtain a VLF modulated output signal, and sends the VLF modulated output signal to a flexible transmitting antenna for transmission after power amplification andautomatic tuning. The flexible transmitting antenna is configured to generate and transmit a VLF signal of a predetermined carrier frequency. In the receiver, a highly sensitive receiving antenna anda variable-gain low-noise amplifying unit form a weak signal detecting circuit to receive the VLF signal from the transmitter. The VLF signal is subjected to adaptive interference suppression processing, then is subjected to demodulation and channel error correction decoding, and finally is sent to an external interface through voice decoding and the like. In summary, the wireless transmission subsystem enhances the energy of weak signals, achieves normal communication requirements, improves the stability of through-the-earth communication, and provides a new way for mine disaster communication.

The invention provides a fuel cell stack and a stacking method thereof. The fuel cell stack comprises two end plates, at least one fuel cell monomer and a group of binding pieces. The fuel cell monomer is stacked between the two end plates, the binding pieces are arranged to be bound on outer sides of the two end plates along the stacking direction of the fuel cell monomer, and the binding piecesare arranged to apply a binding force to the end plates so that the fuel cell monomer can be ensured to be stacked between the two end plates.

The invention belongs to the technical field of planetary gear transmission, and specifically relates to a high-reliability bearingless planetary transmission device, which solves the problem that the existing planetary transmission device uses bearings to support the planetary shaft, and it is difficult to meet the strength requirements of each component under the limitation of space size. The problem. High-reliability bearingless planetary transmission device, including the sun gear, several planetary gears and planetary shafts matching the planetary gears are arranged outside the sun gear, the sun gear is meshed with the planetary gear, the planetary gear is meshed with the ring gear, and the planetary gear has no bearings It is directly installed on the planetary shaft, and the planetary shaft is fixedly connected in the planetary frame. The material of the planetary shaft is a high-strength wear-resistant copper-based alloy. The beneficial effect of the present invention is that the hole of the planetary wheel is directly matched with the planetary shaft, and the planetary shaft has both the functions of a shaft and a bearing, which can ensure small size and high strength.

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 discloses a three-phase symmetric printed winding which is applied to high-precision servo driving motors with high dynamic performance and comprises 4M conductor sheets. The 4M (the M is a positive integer) conductor sheets are overlapped on one another to form the three-phase symmetric printed winding, each conductor sheet comprises 3N (the N is a positive integer larger than or equal to 4) conductors, the various sheets are adhered with one another by insulating grey cloth, a group comprises two adjacent sheets, and the outer ends of the conductors of the two conductor sheets in each group are uniformly staggered from one another in a crossed manner; the inner ends, which are aligned with one another pairwise, of the conductors of the two conductor sheets in each group are communicated with one another, and the outer ends, which are aligned with one another pairwise, of the conductors of the conductor sheets in each two corresponding groups are communicated with one another; six distributed windings can be acquired according to laws of three-phase windings with 60-degree phase belts after the six conductors on the uppermost layer and the six conductors on the lowermost layer are disconnected from one another, and are denoted as U+, U-, V+, V-, W+ and W- respectively, the distributed winding U+ and the distributed winding U- are connected with each other in series to obtain a U-phase winding, the distributed winding V+ and the distributed winding V- are connected with each other in series to obtain a V-phase winding, the distributed winding W+ and the distributed winding W- are connected with each other in series to obtain a W-phase winding, and the tail ends of the U-phase winding, the V-phase winding and the W-phase winding are connected with one another.

The invention relates to a double-MCU digital PI and PWM control multifunctional welding machine and a circuit structure thereof. A switching power supply circuit is adopted; a control circuit composed by taking the double-MCU digital PI and PWM as a core is adopted, and a hardware circuit is replaced with software as far as possible; and the problem is solved in the mode of dividing circuit boards into power boards and control boards, therefore, output control of two welding methods including manual arc welding and argon arc welding is achieved, the functions of VRD low no-load voltage outputand welding parameter number presetting and displaying are achieved, the problem that the net voltage fluctuation resisting capability of a welding machine is poor is solved, the size of the controlboards and the whole machine is decreased, the weight of the whole machine is decreased, and the power-size ratio of the whole machine is increased. As the integration degree of the control circuit isimproved, connecting wires among the circuit boards are decreased, therefore, the reliability of the welding machine is further improved, and the manufacturing technology of the welding machine is simplified.

The invention relates to a double-break-point medium voltage magnetic retention relay. The relay comprises a cover shell, wherein the cover shell is provided with a coil combination, an armature combination and a contact system, the coil combination comprises a yoke iron, a magnet steel, a coil, an iron core and a magnet conductor, the armature combination comprises an armature and a movable contact piece, the armature is positioned below the magnet steel, movable contacts are arranged at both ends of the movable contact piece, and the movable contacts at both ends of the movable contact piececorrespond to the static contacts of the contact system; The coil is composed of two groups of coils with opposite winding directions. Firstly, one group of coils is energized, and the coil drives the armature to rotate around the shaft and drives the movable contact piece to rotate around the shaft, and is connected with the static contact point on one side of the contact system. The other set of coils is energized, and the coils drive the armature to rotate in the opposite direction about the axis, and drive the movable contact piece to rotate in the opposite direction about the axis, and are connected with the static contact on the other side of the contact system. The invention realizes the breaking contact between the contact system and the movable contact piece, and obtains sufficient clearance for cutting off the load in a limited space.

The invention discloses a method for manufacturing a three-phase symmetric printed winding, and particularly relates to methods for manufacturing three-phase symmetry printed windings with extremely low torque pulsation. The method includes manufacturing group sheets from stamped steel; manufacturing a closed printed winding from the group sheets; removing six conductors of the uppermost layer and six conductors of the lowermost layer of the printed winding by means of shearing to acquire a distributed winding U+, a distributed winding U-, a distributed winding V+, a distributed winding V-, a distributed winding W+ and a distributed winding W-; connecting the distributed winding U+ with the distributed winding U- in series or parallel to obtain a U-phase winding; acquiring a V-phase winding and a W-phase winding by the aid of identical processes; connecting the U-phase winding, the V-phase winding and the W-phase winding with one another to obtain the three-phase symmetric printed winding in star or delta connection. The method has the advantages that the shapes, including the distribution radiuses and the radiuses of matched cylinder permanent magnets of motors, of the conductors are optimally designed by the aid of an optimal design process, and accordingly the torque pulsation generated by counter-electromotive-force harmonic components can be minimized; the three-phase symmetric printed winding manufactured by the aid of the method can be applied to the high-precision servo driving motors with high dynamic performance.

A contactless magnetic support for a marine hydrokinetic energy harvesting system. The marine hydrokinetic energy harvesting system employing flow induced oscillations. The contactless magnetic support comprising a first ferromagnetic core; and a second ferromagnetic element being magnetically positioned relative to the first ferromagnetic core, the second ferromagnetic element being smaller compared to the first ferromagnetic core thereby inducing a non-homogenous magnetic field caused by dimensional disparity.

The invention discloses a wireless transmission subsystem for VLF through-the-earth communication, comprising a transmitter and a receiver. The transmitter first adaptively encodes and modulates speech codes and short messages or data to obtain a VLF modulated output signal, and sends the VLF modulated output signal to a flexible transmitting antenna for transmission after power amplification andautomatic tuning. The flexible transmitting antenna is configured to generate and transmit a VLF signal of a predetermined carrier frequency. In the receiver, a highly sensitive receiving antenna anda variable-gain low-noise amplifying unit form a weak signal detecting circuit to receive the VLF signal from the transmitter. The VLF signal is subjected to adaptive interference suppression processing, then is subjected to demodulation and channel error correction decoding, and finally is sent to an external interface through voice decoding and the like. In summary, the wireless transmission subsystem enhances the energy of weak signals, achieves normal communication requirements, improves the stability of through-the-earth communication, and provides a new way for mine disaster communication.

The invention discloses a magnetic bearing disc type precise air-conditioner fan, comprising fan blades, a motor and at least one magnetic bearing, wherein the motor comprises a motor stator, a motor rotor and a stator shaft fixedly arranged on the motor stator; the magnetic bearing comprises a magnetic bearing rotor arranged on the stator shaft and a magnetic bearing stator with an E-shaped section and arranged in a fan blade sleeve; and six stator teeth are axially arranged on the motor stator, a winding is wound on the stator teeth, and the motor rotor comprises four salient pole mechanism arranged on the fan blade sleeve. The magnetic bearing disc type precise air-conditioner fan has the beneficial effects that no mechanical friction is generated between the stator and the rotor, the mechanical noise and vibration are eliminated, the noise and vibration of the air-conditioner fan are greatly reduced, no cooling system and lubricating system are needed, meanwhile the size and weight of the fan are also reduced, and the effects of energy conservation and emission reduction are realized.

The invention relates to the technical field of heat engines, in particular to a low-temperature heat energy conversion mechanical energy device which comprises an ammonia heat exchange unit and a pneumatic device for converting heat energy exchanged by the ammonia heat exchange unit into mechanical energy. The ammonia heat exchange unit comprises a plurality of heat energy units connected in series and a container; the heat energy unit is a heat regenerator, an ammonia water heat exchange pipe and a heat source heat exchange pipe are arranged in the heat regenerator, and heat source outlets and heat source inlets of every two adjacent heat regenerators are communicated; the liquid outlets and the liquid inlets of the ammonia water heat exchange pipes in the two adjacent heat regenerators are communicated with each other; a plurality of heat energy units are connected in series and combined, each heat energy unit comprises a heat regenerator, a heat source heat exchange tube and an ammonia water heat exchange tube, and the heat source heat exchange tubes transfer heat energy of hot fluid to the heat energy units; the multiple heat energy units are connected in series and connected with the pneumatic device through the container, high-power equipment operation requirements are met, the structure is simple, and later maintenance is convenient.

The invention relates to a radial roller screw and a variable-speed transmission thereof. A rotary disc (3), a toothed disc (15), a slide block (4) and a roller (5) are used for sheathing and rotation; when a differential gear is engaged by a clutch, the rotary disc (3) rotates relative to the toothed disc (15), the slide block (4) drives a small center shaft (6) and planetary wheels (24) to do radial displacement, the output rotation speed is gradually increased and decreased, and the stepless variable-speed transmission is realized; a spline shaft (28) is connected with a plurality of pairs of driving wheels (27) to respectively drive several planetary wheels (24); an outer press ring (30) and an outer disc spring (23) are fixedly connected and are arranged in a radial floating sleeve ring to form single-line transmission; the planetary wheels (24) are movably matched and parallelly connected with the small center shaft (6) to form a multi-line distribution beam type cage-shaped revolving body; the planetary wheels (24) are pressed by an inner disc spring and the outer disc spring, and the contact transmission force and torque are proportionally increased and decreased, and are consistently adjusted; the clutch (9) and a shift rod (29) synchronously move left and right at equal amount, and the small center shaft (6) parallelly displaces. Each line of planetary wheels (24) bears the load, so the contact stress is decreased, and the slip rate is reduced. The transmission effect of the high-power and high-efficiency stepless variable speed in automobiles and numerical control machining tools is obvious.

The invention discloses a transfer mechanism used for large heavy-load components under the nuclear environment. Movement of a lifting hook is controlled by three hydraulic cylinders, and each hydraulic cylinder controls one direction. One hydraulic cylinder located on the lower side controls the freedom degree in the vertical direction and is connected with the lifting hook through a composite hinge and the like; the other hydraulic cylinder located on the lower side drives the stretching freedom degree and is connected to a universal joint on the rear portion of the lifting hook through theother set of composite hinge and the like; and the hydraulic cylinder located on the lateral upper side drives the lateral movement freedom degree and is connected with the side of the lifting hook through a spherical hinge. A reset spring is mounted at each of the top and the bottom of the mechanism. The transfer mechanism is used for the nuclear maintenance process, replacement of modules in large heat furnaces and the like.

The invention discloses a flat traction motor for an elevator. The radial magnetic flux permanent-magnetism traction motor comprises a stator part and a rotor part, a rotor comprises a traction rope groove portion, a stator support portion and a rotor plate in U shaped connection; the inner edge of the rotor plate is integrated and connected to the first end edge of the stator support portion, theouter edge of the rotor plate is integrated and connected to the first end edge of the traction rope groove portion, and the traction rope groove portion is positioned in the periphery of the statorsupport portion; a traction rope groove is arranged in the outer peripheral surface of the traction rope groove portion, and magnetic steel is attracted by the inner peripheral surface of the tractionrope groove portion; a stator core is fixed to the outer peripheral surface of a stator core support portion, and the stator core, a stator coil and the stator core support portion are positioned inan annular groove between magnetic steel of the rotor and the stator support portion, and the inner peripheral surface of the stator core support portion is supported by the outer peripheral surface of the stator portion via a pair of bearings. The motor is short in the axial length, compact in structure and good in heat radiation effect.

The charging power set is a permanent magnetic outer rotor type one with peripheral permanent magnets in interval of 0.5-0.8 time the width; single phase winding embedded inside the stator groove; stator groove in special shape and size; stator shaft twisted relatively to the axis with the total twisting amount being 12 times the slot width; and stator winding divided into several groups. Each of the windings has the output connected via reactor to AC side of rectifier, and the DC outputs of the rectifiers are connected serially and parallelly to combine varying DC output voltage for charging different load. The power set has high power-to-volume ratio, small volume, light weight, high conversion efficiency and good charging characteristic. The power set is used as DC power supply for constant current charging and fast charging and may be also used as other DC power supply.