34results about How to "High power density" patented technology

Novel proton exchange membrane fuel cells and direct methanol fuel cells with nanostructured components are configured with higher precious metal utilization rate at the electrodes, higher power density, and lower cost. To form a catalyst, platinum or platinum-ruthenium nanoparticles are deposited onto carbon-based materials, for example, single-walled, dual-walled, multi-walled and cup-stacked carbon nanotubes. The deposition process includes an ethylene glycol reduction method. Aligned arrays of these carbon nanomaterials are prepared by filtering the nanomaterials with ethanol. A membrane electrode assembly is formed by sandwiching the catalyst between a proton exchange membrane and a diffusion layer that form a first electrode. The second electrode may be formed using a conventional catalyst. The several layers of the MEA are hot pressed to form an integrated unit. Proton exchange membrane fuel cells and direct methanol fuel cells are developed by stacking the membrane electrode assemblies in a conventional manner.

The invention discloses a mixed permanent magnetic pole-alternating and magnetic flux-switching memory motor and a winding switching magnetism-weakening control method thereof. The mixed permanent magnetic pole-alternating and magnetic flux-switching memory motor comprises a salient rotor and a stator, wherein the stator contains stator cores, aluminium-nickel-cobalt permanent magnets, neodymium-iron-boron permanent magnets, centralized armature windings and pulsed magnetism-adjusting windings; iron core edges of two adjacent outer U-shaped units and tangentially-magnetized long-stripped neodymium-iron-boron permanent magnets form a first permanent magnetic pole, while the circumferentially-inward (outward) and parallel-magnetized V-shaped embedded aluminium-nickel-cobalt permanent magnets and inner U-shaped units form a second permanent magnetic pole; mixed magnetic poles are in alternating polarity distribution; when the motor runs at a low speed, the pulsed magnetism-adjusting windings are in direct-current pulsed working state, while in a high-speed weak-magnetism area, the pulsed magnetism-adjusting windings are converted into alternating-current armature windings. Requirements on performance in a low-speed area and in the high-speed area can be met at the same time; influence of an armature reaction field on the aluminium-nickel-cobalt permanent magnets with low coercivity is small; the utilization rate of permanent magnetism, the torque density, and the reliability of system operation are high.

The invention belongs to the technical field of the permanent-magnet brushless machine manufacture, particularly to a stator permanent-magnet machine adaptable to the application fields of wide speed regulation and high efficiency, such as the mixing dynamic car and the electric automobiles, composed of a stator, a rotor, an armature winding and an NdFeB permanent magnet, characterized in that, the original NdFeB permanent magnet is saved, an ALNiCo permanent magnet and a magnetizing winding for adjusting the magnetic field strength and the magnetic flux density of the ALNiCo permanent magnet are arranged on the stator. The invention has the advantage that, the ALNiCo permanent magnet and the magnetizing winding are first inducted in the stator permanent-magnet, to cause that the flux memory type stator permanent-magnet machine inherits the advantages of large power intensity and good fault tolerant performance of the stator permanent-magnet machine, meanwhile solves the defect that it is difficult to realize the weak magnetic control, the range of the constant power speed control is small and the operating efficiency of the constant power operation is low.

A lithium-ion capacitor includes a cathode, an anode, and a porous separator positioned between the cathode and the anode. The cathode is formed using activated carbon, and the anode is formed from a composite material that includes lithium titanium oxide and a carbon material such as hard carbon or graphite.

The invention discloses a robot joint rotating hydraulic cylinder with torque and angle feedback functions. The robot joint rotating hydraulic cylinder comprises an open type sealed hydraulic oscillating cylinder, a torque sensing module and an angular displacement sensing module, wherein the open type sealed hydraulic oscillating cylinder comprises an oscillating cylinder output shaft, an elastic retainer ring, a bearing, a shaft sleeve, an outward leakage radial O-shaped sealing ring, an outward leakage O-shaped polytetrafluoroethylene ring, an open type cylinder cover, a leakage axial O-shaped sealing ring, a cylinder body, a fixed blade, a movable blade, an inward leakage polytetrafluoroethylene bar, an inward leakage sealing bar and an oil inlet and outlet channel connecting piece; the torque sensing module comprises an elastic shaft coupling, a torque detection shaft, a strain gauge, a torque detection signal line, a torque transmission flange, a torque transmission and support dual-purpose flange and a larger leg; the angular displacement sensing module comprises a shaft coupling, an encoder bracket, an encoder and a smaller leg. The hydraulic cylinder can provide large torques, is simple in structure, and is easy and convenient to control. Meanwhile, a modular structure is adopted, thereby realizing torque feedback and angle feedback functions.

The invention discloses a magnetic flux switching type permanent magnet memory motor comprising an enclosure, a stator contained in the enclosure, a rotor (2) and a non-magnetic rotary shaft (8). The magnetic flux switching type permanent magnet memory motor is characterized in that the stator (1) is arranged at the outer part of the rotor (2); the rotor (2) is fixedly arranged on the non-magnetic rotary shaft (8) and is in a convex pole type; the rotor (2) comprises a rotor main body part and rotor teeth which protrude from the main body part to a direction which is far away from the center of the rotor; the stator comprises a stator iron core (1), a permanent magnet (3), a three-phase armature winding (4) and a pulse winding (5); the stator iron core (1) comprises a plurality of stator yokes and stator teeth (1.1) which protrude from the stator yokes to the direction of the center of the stator iron core; and the three-phase armature winding (4) is wound on the stator teeth (1.1). According to the magnetic flux switching type permanent magnet memory motor disclosed by the invention, a motor no-load gap magnetic field is adjustable, and the weak magnetism capability and the rotary speed operation speed of the motor are improved; and meanwhile, the torque and the power density of the motor are improved and the copper consumption of the motor is reduced.

A laser diode array is formed on a substrate (310) in which a number of parallel grooves (312) are formed. A metal layer (410) is formed on the grooves (312). Laser diode bars (314) are fitted in alternate grooves, and every other groove is left vacant to serve as a cooling channel (316). The array is immersion cooled in a housing (210). Liquid coolant is circulated through the housing (210) and through a heat exchanger (216). The liquid coolant flows over a major surface of the substrate (310) and through the cooling channels (316). Thus, heat is removed by circulating fluid from three sides of the laser diode bars (314). Such high-performance cooling permits the laser diode array to have a greater power density.

The invention provides a preparation method and application of a ZnCo2O4@MnO core-shell heterostructure nanotube array material. According to the prepared product, a ZnCo2O4 nanowire serves as a framework and is wrapped with a MnO nanofilm material, and the product grows vertically, is arranged orderly and has a regular three-dimensional heterostructure. Compared with the prior art, the product prepared through the preparation method is high in purity, good in dispersity, good and controllable in crystalline form, low in production cost and good in reproducibility. The prepared tubular ZnCo2O4@MnO core-shell heterostructure nanotube array grows on nickel foam, can serve as an electrode material of a super capacitor directly, has long-term circulatory stability, large specific capacitance and high energy density and power density, and has great commercial value.

The invention provides a permanent magnet brushless direct current linear motor with a structure of a rotor screw, belonging to the technical field of direct current linear motors. A rotor consists of rotor magnetic steel and a rotor yoke, and the rotor magnetic steel is arranged on the exterior of the rotor yoke; and a stator consists of a stator punching sheet and a main case. The permanent magnet brushless direct current linear motor comprises a ball screw, a screw nut and supporting bearings, wherein a pair of supporting bearings are respectively arranged between the ball screw and the main case, the screw nut is fixed in the rotor yoke, and the ball screw is in threaded connection with the screw nut. The permanent magnet brushless direct current linear motor with the structure of the rotor screw, disclosed by the invention, has the advantages of compact structure, small volume, uniform air gaps and good heat dissipation effect, and quickness, sensitivity and freeness in starting and stopping, and is especially suitable for high-precision linear feed function locations of minitype machine tools or electric tools such as automatic drilling machines, electric screwdrivers and the like.

The present invention discloses a Halbach array permanent magnet DC brushless motor which comprises a shell, a stator, a rotor and a commutation circuit. The rotor comprises a rotary table body and 4n permanent magnet blocks which form a Halbach ring array. The stator comprises a magnet yoke and 4n groups of coils for constructing the Halbach array. The commutation circuit is connected to the coils. When the radially magnetized permanent magnet blocks and coils pointing at the permanent magnet blocks are in the same magnetic direction, the current direction of the coils is changed. Both the rotor permanent magnet blocks and the stator coils use the Halbach arrays, the electrical magnetic field generated by the coils at an action pole surface is larger than that of a traditional structure coil, the utilization rate of magnetic energy is improved significantly, and the magnetic field intensity between a permanent magnet ring and an induction ring is improved significantly. Compared with the existing motor, torque and power density are larger in the same volume, the volume and weight are smaller in the same output power, and the Halbach array permanent magnet DC brushless motor has the advantages of simple structure, high efficiency, good heat dissipation and low failure rate and belongs to a novel brushless motor.

The invention discloses a transverse flux permanent-magnet planar motor, and relates to the filed of motors. The transverse flux permanent-magnet planar motor solves the problems of limited stroke of a rotor, low thrust density, complicated structure of the motor, low current control accuracy and the like in the conventional permanent-magnet planar motor. The primary of the motor consists of a plurality of motor units; each w motor units consist of m2 phase armature units; and the m2 phase armature units form a phase armature unit array; the intervals between rows and the intervals between columns are the same; each phase armature unit consists of a phase unit iron core and a phase unit winding; each phase unit iron core with perforations consists of two iron core units, the perforations are formed by overlapping tooth spaces of the two iron core units, two teeth of each iron core unit are arranged along the horizontal direction of a cross section, and a magnet yoke section is connected between the two teeth; a coil is wound into a phase of phase unit winding through the perforations; and the tooth pitch tau a between two adjacent phase unit iron cores along the X direction or Y direction is equal to [1+j/m]] tau p. In addition, the motor has the advantages of simple structure and easy realization of modulization, and the stroke of the motor is not limited.

The invention discloses a halbach array disk-type motor, which comprises a rotor, a stator, a fixed shaft and a commutating circuit, wherein the rotor and the stator are connected with each other in series; the rotor comprises a rotor fixing disk and 4n permanent magnet blocks of an annular halbach array; the stator comprises a stator fixing disk, a magnet yoke and 4n coils in the halbach array; the halbach array is adopted by the permanent magnet blocks of the rotor and the coils of the stator of the motor; the electromagnetic field generated by each coil at one side of each permanent magnet block is significantly greater than that of a traditional structure; and the flux density between a permanent magnet ring and an induction ring is high. Compared with an existing motor, the halbach array disk-type motor has higher torque and power density under the same dimension, has smaller dimension and weight under the same output power; through switching a motor power generation working mode and an electric work mode, kinetic energy is recovered when the rotor is braked; the kinetic energy of the rotor is converted into electric energy to recover; the energy consumption is reduced; and in addition, the motor also has the advantages of simple structure, good heat dissipation property, low fault rate and the like, and belongs to a novel disk-type motor.

The invention discloses a polyphase permanent magnet motor with a leakage reactance adjustable structure, and belongs to the technical field of motors. The motor can be a cylindrical rotating motor as well as a flat linear motor. The air gap side of a stator core is a smooth surface, and core slots are axially reserved on the other side of the stator core. A plurality of core slots are uniformly distributed on the surface of a stator. A coil rack is fixedly arranged on the air gap side of the stator core, and is uniformly provided with a plurality of coil slots along a circumferential direction. The coil slots are in one-to-one correspondence with the stator slots. The centerlines of the coil slots and corresponding core slots are positioned on the same radius. One active side of each coil of an armature winding is embedded into a wire casing, and the other active side of the coil is embedded into a stator slot opposite to the wire casing. The stator slot is an open slot, a closed slot or a semi-open slot. The polyphase permanent magnet motor has the advantages of high winding accuracy, high insulation characteristics, short end part, high efficiency and small torque fluctuation.

The invention discloses a permanent magnet synchronous motor (PMSM) with two stators, a composite rotor structure and radial and axial mixed magnetic paths and a method thereof. The PMSM comprises a radial stator, an axial stator and a rotor, wherein the rotor is inserted in the radial stator and coaxially arranged with the radial stator, the axial stator is arranged on one end or two ends of the rotor, the axial stator and the rotor are concentric, a radial winding is arranged in the stator groove of the radial stator, an axial winding is arranged in the stator groove of the axial stator, a rotor groove is arranged in the rotor, a permanent magnet is placed in the rotor groove, the permanent magnet enables the rotor to generate a radial magnetic pole and an axial magnetic pole, the radial magnetic pole faces the radial stator of the motor, the axial magnetic pole faces the axial stator of the motor, and the motor generates radial and axial torques to form mixed magnetic paths. The radial magnetic flux and axial magnetic flux generated by the permanent magnet of the motor can be utilized, end portion magnetic leakage can be eliminated, the utilization rate of motor material is improved, and the weight of the motor is reduced.

The present disclosure provides a power converter, including: a pre-stage circuit, configured to receive an input voltage and convert the input voltage to a bus voltage; and plurality of post-stage circuits, connected in parallel to an output terminal of the pre-stage circuit, and configured to receive the bus voltage from the pre-stage circuit and each converts the bus voltage to an output voltage. The power converter provided by the present disclosure can effectively solve the problems of isolation and the wide range of operating voltage, and can take both of high efficiency and high power density into consideration.

A free piston engine is configured with a pair of opposed engine cylinders located on opposite sides of a fluid pumping assembly. An inner piston assembly includes a pair of inner pistons, one each operatively located in a respective one of the engine cylinders, with a push rod connected between the inner pistons. An outer piston assembly includes a pair of pistons, one each operatively located, in a respective one of the engine cylinders, with at least one pull rod connected between the outer pistons. The pull rod extends through an outer pumping chamber in the fluid pumping assembly and forms a fluid plunger within this chamber. Each outer piston cooperates with an integrated scavenge pump in order to compress the charge air, thus significantly increasing the air charge density into the engine cylinders for each stroke of the engine.

A system and method of manufacturing an electric machine comprising a rotor and a stator, wherein the stator comprises a fractional-slot concentrated winding having two sets of terminals, wherein a first set of terminals configures the fractional-slot concentrated winding to have a first pole-number (P1), and wherein a second set of terminals configures the fractional-slot concentrated winding to have a second pole number (P2) different from the first pole-number (P1).

The present invention relates to a VCSEL array comprising several VCSELs arranged side by side on a common substrate (1). Each VCSEL is formed of at least a top mirror (5, 14), an active region (4), a current injection layer (3) and an undoped bottom semiconductor mirror (2). The current injection layer (3) is arranged between the active region (4) and the bottom semiconductor mirror (2). At least an upper layer of the substrate (1) is electrically conducting. Trenches (8) and/or holes are formed between the bottom semiconductor mirrors (2) of said VCSELs to said upper layer of said substrate (1). A metallization (9) electrically connects the upper layer of the substrate (1) with the current injection layer (3) through said trenches (8) and/or holes. The proposed VCSEL array allows a homogeneous current injection an has a high efficiency and power density.

The invention discloses a super capacitor combined electrode preparing method. Nanoscale metallic oxide is grown on a nanometer multi-hole metal framework through an appropriate deposition method, and the nanoscale metallic oxide is processed sequentially to achieve electrode materials which are excellent in capacitive performance and suitable for energy storing devices like super capacitors. The preparing method is simple, moderate in condition, simple in technical parameter and lower in cost. The super capacitor electrode materials prepared in the preparing method have large specific capacitance. The high-performance combined electrodes can be widely applied to the technical fields of micro energy storing devices, sensors, flexible electric devices and the like, are suitable for development of energy storing devices in the future and have considerable application prospect.

A flyback power converter is disclosed. The flyback power converter includes a voltage transformer, a main switch, a synchronous rectification switch, a synchronous rectification control circuit, a sampling circuit and an operation circuit. A control end of the main switch receives a main switch signal so as to control the main switch. The synchronous rectification control circuit transmits control signal to control end of the synchronous rectification switch according to sensing signal received. The sampling circuit samples the state of the synchronous rectification switch so as to generate first logic signal and second logic signal. The operation circuit executes timing for charging/discharging according to the first and the second logic-signal, so as to output switch cut-off pulse signal to a voltage-dividing circuit. If voltage of the sensing signal is lower than predetermined threshold voltage, the synchronous rectification switch enters into cut-off state according to the control signal.

Circuit structures and methods are described for achieving zero voltage switching in flying capacitor converters for both isolated and non-isolated applications. A first method is described in which zero voltage switching is achieved by operating the circuit with a variable frequency so that each switch in its on state remains on until the magnetizing current in a main inductor is reversed to a current magnitude sufficient to drive a zero voltage switching transition for a main switch. A second method is implemented with a main coupled inductor wherein a winding current is reversed and energy in a leakage inductance drives a zero voltage switching transition for a main switch. A third method is implemented with auxiliary inductors, auxiliary switches, and auxiliary capacitors which reverse the current in the auxiliary inductor which provides the necessary energy for driving a zero voltage switching transition for a main switch.

A rotary anode for a rotary anode X-ray tube has an anode disc with a supporting portion. A focal track is located in the vicinity of an outer diameter of the anode disc. The supporting portion has inhomogeneous material properties along a radial coordinate of the anode disc to provide a high mechanical load capacity in the area of an inner diameter of the anode disc and a high thermal load capacity at the focal track. These measures provide for a rotary anode for a rotary anode X-ray tube that meets the extreme thermal and mechanical loads during operation. Further, a method for manufacturing such a rotary anode is described as well.

A power saving device is configured in an all-in-one PC and has a power module expandably composed of a plurality of Ni-MH cells linked up either in series connection or in parallel connection. When an external alternating power provides power supply for the PC, a charging circuit of the power saving device charges the power module. When the alternating power is out or the PC is operated to enter a power saving mode, a controller of the power saving device notifies the PC to enter the power saving mode, while the power module provides power for the memory and memory controller of the PC with low power consumption. The all-in-one PC consumes little power while in power saving mode and is capable of restoring to its normal mode in short time. The power saving device enhances the all-in-one PC with features of instant-on, long-time standby, and backup power provision.

The invention discloses an electrochemical capacitor and a manufacturing method of the electrochemical capacitor. The electrochemical capacitor comprises a plurality of capacitor bodies. Each capacitor body comprises a shell body, a positive electrode, a negative electrode, a membrane and an electrolyte. Each positive electrode comprises a positive electrode current collector and a positive electrode active substance layer attached to the surface of the positive electrode current collector. Each negative electrode comprises a negative electrode current collector and a negative electrode active substance layer attached to the surface of the negative electrode current collector. The positive electrode current collectors and the negative electrode current collectors are nickel-plated napped metal sheets. The membranes are bidirectional-stretched polypropylene membranes obtained after Co60 irradiation graft modification. The electrolyte is potassium hydroxide solutions containing a small number of cobalt ions and a small number of lithium ions. The electrochemical capacitor is high in capacitance, large in energy density and power density, low in self-discharging rate and long in service life, and has the good energy storage capacity; in addition, the manufacturing technology is simple, and the electrochemical capacitor is quite suitable for serving as an energy storage device for small-and-medium-size wind power generation and solar power generation and a traction power source of various electric cars.

The invention discloses a steam box control method and a steam box. The steam box comprises a steam generating device, which comprises a base plate structure and at least one group of thick film heating resistance wires arranged on the base plate structure,wherein the adjacent thick film heating resistance wires are independently coiled or parallelly coiled; and a temperature collecting unit is in contact connection with each group of thick film heating resistance wires. The steam box control method comprises the following steps: controlling a thick film heating resistance wires to heat at first power; detecting the actual temperature value of the steam box; when the actual temperature value of the steam box reaches the first preset temperature, controlling the thick film heating resistance wires to stop heating; and when the actual temperature value in the steam box cavity is reduced and is lower than a second preset temperature, controlling the thick film heating resistance wires to heat for a preset time length at a second power. According to the steam generation device, the steam generation time of the steam box is greatly shortened,and the heat efficiency of the steam box is higher; and the cooking time is effectively shortened through the control mode of the steam box, the food taste is improved, and the use experience of a user is improved.

A multi-stage planetary transmission for a bicycle or a pedelec includes a transmission input shaft (1), a transmission output shaft (2), and at least three planetary gear sets (VRS, VR1, VR2, RS1, RS2, NRS, NR1, NR2). A first planetary gear set (RS1) and a second planetary gear set (RS2) are configured as a main gear set and at least one further planetary gear set (VRS, VR1, VR2, NRS, NR1, NR2) is configured as a front-mounted gear set and/or as a rear-mounted gear set. At least three free-wheel clutches (F1, F2, F3, F4) and at least three brakes (B1, B2, B3, B4) are provided for implementing at least eight gears (G1, G2, G3, G4, G5, G6, G7, G8, G9, G10, G11, G12, G13, G14, G15, G16). Moreover, the multi-stage transmission may be a bottom bracket transmission. In addition, a bicycle or pedelec with the multi-stage transmission is proposed.

A hydraulic charging and driving system (4), aircraft employing the same, and corresponding methods, for extending and retracting a hydraulic actuator (2), comprising: a motor assembly (22); and an accumulator assembly (20), the motor assembly (22) and the accumulator assembly (20) being hydraulically coupled to each other; wherein the motor assembly (22) is arranged to recharge the accumulator assembly (20) with hydraulic fluid at a relatively slow rate that is slower than the rate at which the accumulator assembly (20) is arranged to discharge when actuating the hydraulic actuator (2). The system may further comprise a selector valve (24). The accumulator assembly (20) may comprise an accumulator chamber (30), and a compression means (32) provided within the accumulator chamber (30). The motor assembly (22) may comprise a motor (42) arranged to vary a volume of a hydraulic charging chamber (38) of the motor assembly (22).

A single core 35, 50 or a plurality of cores arranged in rings 21, 28, 29 around a central core 20, 27, or in an array 42, are provided with either or both of (a) a modal discrimination characteristic, including gain, index of refraction and cross sectional area, which is greatest in the center of the core or the array, and lowers outwardly therefrom, and (b) an oblong cross section, thereby to provide either or both of (c) a bright laser beam of the fundamental in-phase supermode, and/or (d) a linearly polarized output beam.

The invention relates to a rotating electrical flux-switching machine, comprising a rotatable tubular rotor (2), an inner first stator (3), and an outer second stator (4) that is concentric and spaced apart relative to the first stator (3), wherein the rotor (2) is arranged concentrically relative to the first and second stator (3, 4) and is arranged between the first and the second stator (3, 4) in such a way that a first air gap (10) is formed between the first stator (3) and the rotor (2), and a second air gap (11) is formed between the second stator (4) and the rotor (2). The invention also relates to an aircraft comprising a rotating electrical machine of this type.

The invention relates to an alpha radioactive source nuclear battery based on a micropore array collimator, and aims to solve the problem that the output performance of an alpha radiation volt effect nuclear battery is reduced in a short time due to the fact that high-energy alpha particles generated by an alpha radioactive source cause large irradiation damage to a semiconductor transduction unit. The nuclear battery comprises a shell and an insulating base, the shell is provided with an open end, the insulating base is fixed at the open end of the shell, and a radioactive source substrate plate, a micropore array collimator and a silicon carbide semiconductor transducer are sequentially arranged on the insulating base in the shell from one side to the other side. The side, close to the micropore array collimator, of the radioactive source substrate plate is covered with an alpha radioactive source, and the positive electrode and the negative electrode of the battery are led out through the silicon carbide semiconductor transducer. According to the invention, the micropore array collimator is used for controlling the energy deposition distribution of the energy-carrying alpha particles in the silicon carbide semiconductor transducer, the irradiation damage of the alpha particles to the sensitive area of the silicon carbide semiconductor transducer is weakened, and the service life of the nuclear battery is effectively prolonged.