1985 results about "Power density" patented technology

The invention provides a permanent magnet motor and a variable-frequency scroll compressor, and relates to the technical field of scroll compressor design and manufacturing, and the permanent magnet motor comprises a stator iron core and a rotor iron core; the stator iron core comprises stator slots which are uniformly distributed along the circumference, copper windings are embedded in the slots, stator yokes which are uniformly distributed are arranged outside the bottom of each slot, each stator yoke is provided with an arc-shaped long slot, stator teeth are arranged between every two adjacent stator slots, and the tops of the stator teeth are sunken to form through-flow slots; the rotor core is internally provided with magnetic steel grooves which are uniformly distributed, two same first magnetic isolation grooves are arranged between two adjacent magnetic steel grooves, magnetic steel is arranged in the magnetic steel grooves, and the top of each magnetic steel is provided with two second magnetic isolation grooves which are symmetrically distributed. The outer side radius Rs1 of the stator core, the inner side radius Rs2 of the stator core and the axial length Lis of the stator core meet the following conditions: 1.282 < = Lis / (Rs1-Rs2) < = 2.778, and 34 < = Rs1-Rs2 < = 39 mm. The power density of the motor can be increased, the cost is reduced, the efficiency is improved, and the harmonic content is reduced so as to suppress torque ripple.

The invention provides a permanent magnet motor and a scroll inverter compressor, and relates to the technical field of scroll compressor design and manufacturing, and the permanent magnet motor comprises a stator iron core and a rotor iron core; the stator core comprises stator teeth and a stator yoke which are uniformly distributed along the circumference, fluid through grooves are formed in the outer side of the stator yoke at the tops of the stator teeth, stator grooves are formed in two adjacent stator teeth and the stator yoke between the two stator teeth, and a plurality of strands of conductive circular enameled wires are embedded in each stator groove; the outer side of the rotor core is composed of linear segments and arcs, air grooves which are evenly distributed are formed in the rotor core, non-uniform magnetic isolation bridges are formed between the air grooves and the linear segments on the outer side of the rotor core, a certain distance is formed between every two adjacent air grooves, parallel magnetic conductive ribs are formed, and permanent magnets with the magnetic field directions changing alternately are embedded in the air grooves. A rivet hole, a lightening hole and a shaft hole are arranged close to the inner side of the rotor core. Therefore, the defined proportionality coefficient Ks is kept in a reasonable range, the power density of the motor can be increased, the cost is reduced, and the efficiency is improved.

The invention discloses an equal-sectional-area high-slot-fullness-rate concentrated flat wire winding layout structure. The flat wire winding layout structure comprises a plurality of flat wire windings and a stator core with non-rectangular stator slots, each flat wire winding is wound on a respective stator core tooth part in the stator core and arranged in the same manner, and the width of each layer of flat wires of each flat wire winding is increased layer by layer from the narrower side to the wider side of the stator slot of the stator core. The thickness of each layer of flat wire is increased layer by layer from the wider side to the narrower side of a stator slot of the stator core, the total sectional area of each layer of flat wire is the same, and the wire ends of the flat wire windings are mutually connected at the end part of the motor. According to the invention, the slot fill factor of the flat wire winding in the non-rectangular slot can be effectively improved, the problem of low space utilization rate is solved, the efficiency and power density of the motor are further improved, the current densities at different positions of the conductor in the slot are basically the same, the insulation failure caused by too high local temperature rise is avoided, and the reliability of the winding can be effectively improved.

The invention discloses a hydrogen cooling superconductive flywheel composite energy storage system, which relates to the technical field of new energy storage and comprises a superconductive flywheel energy storage module, a lithium battery energy storage module, a power conversion module, an intelligent control module, a cooling sub-module and a hydrogen energy recovery module, by combining the quick response characteristic of the superconducting flywheel and the high energy density of the lithium battery, the superconducting flywheel can realize quick energy storage and release by utilizing the friction-free characteristic of the superconducting flywheel, a cooling sub-module and a hydrogen energy recovery module are used, the cooling requirement of the superconducting flywheel is ensured, and meanwhile, energy recovery can be carried out; by utilizing the characteristic of high energy density of the hydrogen battery, the energy storage capacity of the composite energy storage system is further improved, and the limitation of a single energy storage technology on power density and energy density can be effectively solved through the hybrid energy storage system; and more reliable and efficient energy storage support is provided for the fields of power grid peak regulation, renewable energy source grid connection, electric automobiles and the like.

The invention relates to the technical field of flexible direct-current power transmission, in particular to a centralized local energy storage modular multilevel converter MMC-CLES topology which comprises three phase units, each phase unit comprises an upper bridge arm and a lower bridge arm, and each upper bridge arm and each lower bridge arm comprise a bridge arm reactor arranged at one end, close to a power grid, of the bridge arm; a plurality of identical sub-modules SM which are connected to a power grid through a bridge arm reactor; the upper bridge arm and the lower bridge arm form a symmetrical structure; an energy storage sub-module is arranged at the position where the three-phase unit is directly connected with the direct-current bus. According to the invention, the control system is simplified, and the hardware cost and the control complexity are reduced. Voltage stress and current stress are smaller, higher power can be borne, and the high-power capacitor is suitable for being applied to high-power occasions. And moreover, due to the symmetrical layout, the control method is relatively simple, soft switching can be realized, and the power divider can be used as a multi-port component unit.

The invention provides a rotor iron core, a permanent magnet motor and an inverter compressor, and relates to the technical field of motor and compressor design and manufacture, the rotor iron core comprises uniformly distributed permanent magnet grooves, a groove is arranged between two adjacent permanent magnet grooves, each groove extends inwards along the radial direction of the rotor iron core, parallel magnetic bridges are arranged between the grooves and the permanent magnet grooves, and the permanent magnet grooves are connected with the parallel magnetic bridges. A first magnetic barrier groove, a second magnetic barrier groove and a third magnetic barrier groove which are symmetrically distributed are formed in the two sides of the top of each permanent magnet groove respectively, a first arc and a second arc are arranged on the outer side of the rotor core above the magnetic barrier grooves, the second arc intersects with the side edge of the groove, and permanent magnets with alternating magnetism are embedded in the permanent magnet grooves. The radius Rr of the outer side of the rotor iron core, the distance ho from the middle point of the bottom of the permanent magnet groove to the center point of the rotor iron core and the thickness hm of the permanent magnet meet the condition that (Rr-ho) / hm is larger than 2 and smaller than or equal to 3.4. By reasonably arranging the position and the size of the magnetic barrier groove, magnetic circuit distribution can be changed, magnetic flux leakage can be reduced, the power density of the motor can be increased, and electromagnetic vibration noise of the motor and the compressor can be reduced.

The invention discloses an axial flux motor, an electric drive system and a vehicle. The axial magnetic flux motor adopts a single-stator and double-rotor structure in which a stator is arranged in the middle and rotors are arranged on two sides, and comprises a stator assembly, and a first rotor assembly and a second rotor assembly which are distributed on two sides of the stator assembly, and the first rotor assembly and the second rotor assembly are respectively connected with the stator assembly through a first rotor bearing and a second rotor bearing. The single-stator double-rotor axial flux motor only comprises one stator assembly, so that the energy loss is low, the heat productivity is low, the power density is higher, and the energy conversion efficiency is higher. One end of the rotor shaft is fixedly connected with the output part of the first rotor assembly, and the other end of the rotor shaft is in transmission connection with the output part of the second rotor assembly. The tolerance of the relative positions of the two rotor assemblies is smaller, the magnetic poles of the magnetic steel of the two rotor assemblies can be in one-to-one correspondence, and the difficulty of motor calibration after the motor assembly is assembled is reduced.

The invention discloses a liquid cooling heat dissipation control method and device for a high-power charging pile, and the method comprises the steps: obtaining the temperature data of a heating element in the charging pile and external environment parameters, building a dynamic heat load distribution model through a pre-built heat conduction algorithm according to the incidence relation between the temperature data and the charging power, and achieving the heat dissipation of the charging pile. Obtaining heat distribution characteristics; according to the heat distribution characteristics, in combination with a preset heat dissipation efficiency threshold value and a power density requirement in the liquid cooling heat dissipation control system, the cooling liquid flow and the cooling liquid circulation rate under the current working condition are calculated, and a cooling liquid distribution scheme containing a flow distribution proportion and a circulation path is determined; and if it is detected that the external environment temperature in the external environment parameters exceeds a preset threshold range, corresponding environment challenge data are matched from a working condition database, the cooling liquid circulation rate is adjusted, an auxiliary heat dissipation mechanism is activated, and an environment adaptation type heat dissipation mode is generated. The heat dissipation efficiency of the charging pile is improved, precise temperature control is achieved, and therefore safe and stable operation of the charging pile is guaranteed.

The invention discloses a power-saving device and method for high-voltage power utilization, and relates to the technical field of power grid control, a self-adaptive dynamic control strategy and a load prediction function are introduced, and a reactive compensation module can adjust the compensation amount according to the real-time change of the load demand; when the load fluctuates violently, a response can be quickly made, unnecessary energy consumption is reduced, the main line and the load end are respectively provided with compensation equipment, and distributed compensation and main line compensation are dynamically matched through load fluctuation prediction and a self-adaptive control technology; when the load changes, the load end equipment preferentially and quickly responds, the coordination of compensation is effectively improved, redundant power loss is avoided, and the harmonic management module realizes accurate harmonic suppression through real-time harmonic data monitoring and parameter adaptive adjustment of the intelligent filter; the intelligent filter automatically adjusts the damping coefficient and the frequency gain according to the frequency and the power density of each harmonic component, and the harmonic component of the specific frequency is inhibited in time; and the harmonic wave fluctuation coping capability of the system is improved.

The invention discloses a double-closed-loop cooperative control method of a direct-drive electric chassis and a power system, relates to the technical field of power control of electric special vehicles, and provides a rotating speed and torque double-closed-loop cooperative control architecture, and realizes double-core real-time cooperative operation and dynamic optimization of motor output characteristics through a 32-bit processor. A direct-drive transmission structure is combined, a traditional speed reduction device is omitted, a flat wire motor directly drives a rear axle through a transmission shaft, and a four-in-one controller is matched, so that the system loss is reduced by 33%, and the power density is improved by 15%; on the basis of real-time temperature / electric quantity data of a lithium iron phosphate battery management system, control parameters are adaptively adjusted, and the bottleneck of performance attenuation in a low-temperature environment of-35 DEG C is broken through; and a high-voltage interlocking and insulation monitoring module is integrated, and an emergency hydraulic system is automatically switched when an electrical fault occurs, so that multi-stage safety guarantee is formed. According to the technology, the energy recovery efficiency is remarkably improved by 20%, and the wind resistance stability and the extreme environment reliability are effectively enhanced.

The invention provides a proton exchange membrane fuel cell power density and operation parameter optimization method, which comprises the following steps of: constructing a proton exchange membrane fuel cell proxy model based on a random forest algorithm by taking the working temperature, the anode pressure, the cathode / anode relative humidity and the current density of a galvanic pile as input and the power density as output; and the input and output of the proxy model are optimized in combination with an improved spectrum algorithm, so that the maximum power density and corresponding operation parameters can be predicted. When the load demand changes, the fitness function of the improved spectrum algorithm can be changed, the corresponding power density meeting the load demand is calculated, and the corresponding operation parameters of the power density are predicted. According to the method, the optimization time is shortened, the calculation burden in the optimization process is reduced, and the optimization efficiency is improved.

The invention discloses a high-power-density hydrogen fuel cell power supply management integrated system, which integrates FCUVCUBMSDDCPDU functions, and is characterized in that after a pre-charging strategy completion signal is received, the load of a fuel cell is gradually increased according to a preset rate, and the energy demand, current, voltage and temperature changes of a VCU are monitored in real time; and dynamically adjusting parameters of the fuel cell unit FCU, the DCDC converter and the battery charging and discharging BMS according to an analysis result so as to adapt to load changes, so that the problems that in the prior art, a fixed strategy is often adopted for load increase during starting, VCU dynamic response, an FCU function, a DCDC converter function and a battery charging and discharging management BMS function are not efficiently integrated, and the service life of the VCU is influenced are solved. The FCU function and the DCDC converter function are dynamically adjusted according to current, voltage and temperature changes in the load increasing process, and the problem of electric pile protection discharge is solved.

Provided in the present invention are a hybrid excited axial brushless motor and a power generation method thereof. The hybrid excited axial brushless motor comprises a housing and a rotating shaft rotatably fixed in the housing. Seven parts, i.e. a first exciter stator, a first magnetic shunt ring rotor, a first permanent magnet rotor, an armature stator, a second permanent magnet rotor, a second magnetic shunt ring rotor and a second exciter stator are successively mounted in the housing in the axial direction, air gaps being provided between every two adjacent parts. The first permanent magnet rotor and the second permanent magnet rotor are symmetrically arranged and are both rotatably fixed to the rotating shaft; the first magnetic shunt ring rotor and the second magnetic shunt ring rotor are symmetrically arranged and are both fixedly connected to the rotating shaft; the first exciter stator and the second exciter stator are symmetrically arranged and are both fixedly connected to the housing. By means of an armature stator support, the armature stator is fixedly connected to the housing. The present invention achieves brushless hybrid excitation, and increases the power density and the power generation capacity of motors.

Examples are disclosed that relate to an electric machine (102) that achieves independent speed, variable frequency power generation and has increased power density, efficiency, reliability, and reduced complexity relative to conventional electric machines. In one example, an electric machine (102) includes a stator (200), a first stationary winding (202) coupled to the stator (200), a second stationary winding (204) coupled to the stator (200), and a rotor (206). The second stationary winding (204) includes a plurality of winding segments (218) corresponding to a number of phases of power of the electric machine (102). The rotor (206) extends through the stator (200) and the second stationary winding (204). The rotor (206) includes a plurality of rotor segments (220.1, 220.2, 220.3). Each rotor segment (220) of the plurality of rotor segments (220.1, 220.2, 220.3) includes a plurality of pole lobes (222.1, 222.2, 222.3) that extend radially from the rotor segment (220). Two or more pole lobes (222) of each rotor segment (220) are located on opposing sides of a corresponding winding segment (218) of the second stationary winding (204).

The invention discloses a magnetic adjusting assembly, a motor, an electric drive system and a vehicle, and the magnetic adjusting assembly comprises a magnetic conductive part which is suitable for being movably disposed on one side of a rotor in the radial direction, so as to adjust the magnetic flux passing through the rotor. According to the magnetic adjusting assembly, the magnetic flux passing through the rotor is adjusted to change the magnetic flux of the magnetic flux short-circuit loop formed by the magnetic conductive piece and the rotor, so that the adjustment of the magnetic flux of the main magnetic field is realized, the adjustment is convenient, and the motor applying the magnetic adjusting assembly has the advantages of a constant torque area and a constant power area; and a constant-power operation region and a high-efficiency region are effectively widened while high torque density and power density are ensured.

The invention belongs to the technical field of robot and intelligent equipment driving, and discloses an integrated servo push rod and a control method.A push rod module is integrally designed, and a high-density motor, a ball push rod and a band-type brake are arranged in the push rod module. The invention has the characteristics of high power density, small volume, high precision, high response speed, low noise, long service life, high reliability and the like. The inside of the push rod is contacted with the deep groove ball bearing at the tail end of the screw rod through the ball retainer, and the outside is contacted with the oil-free bushing, so that the lateral strength of the push rod is improved, friction is reduced, and operation efficiency is improved. A linear encoder is arranged at the end of the screw rod, accurate control of the tail end can be achieved, a magnetic encoder is arranged at the tail end of the motor, input and output end double-closed-loop can be achieved, precision can be improved, and errors of band-type brake in power-off response time can be compensated; the lead screw is connected with the motor through the diaphragm coupling in the motor, so that the axial space is saved, and the service life of the motor is prolonged.

The invention provides a power main transformer structure. The power main transformer structure comprises a magnetic core, a first framework, a second framework, a primary winding and a secondary winding. The magnetic core comprises a magnetic column, the first framework and the second framework are arranged on the magnetic column in a sleeving mode, and the first framework is arranged on the outer side of the second framework in a sleeving mode. One of the primary winding and the secondary winding is wound on the first framework, and the other one is wound on the second framework. A gap is formed between the first skeleton and the second skeleton. According to the invention, the first skeleton and the second skeleton sleeve the magnetic column and are arranged in an overlapped manner, so that it can be ensured that the transmission energy of unit turns is higher than that of non-overlapped arrangement, and meanwhile, the magnetic flux leakage is small, the precision is high, and the structure is suitable for various power levels. The first framework and the second framework are spaced, so that stray capacitance between the primary winding and the secondary winding is smaller, meanwhile, the gap is used for heat dissipation and ventilation, and the loss problem and the power density problem caused by heat dissipation can be effectively reduced.

The invention provides a new energy ship energy storage battery system and a control method, and the method comprises the steps: carrying out the electric quantity detection of a target capacitor bank, obtaining the first electric quantity rise time, and predicting the second electric quantity rise time of the target capacitor bank; extracting a power density characteristic in the charging power density sequence, and comparing the power density characteristic with a capacity rising characteristic of the target capacitor bank to obtain the battery convection energy efficiency of the energy storage battery system of the new energy ship; determining target required power of the energy storage battery system based on the current ship navigation state and the static load power; adjusting the discharge state of the energy storage battery pack according to the target demand power and the convection energy efficiency, and correcting a power control parameter when the target capacitor bank is charged according to the first electric quantity rise time and the second electric quantity rise time, so that the response speed of a power controller can be improved when the electric quantity rise speed of the target capacitor bank is relatively slow; and the dynamic performance of the ship is improved under the working condition of frequent load fluctuation.

The invention discloses a motor, a compressor and an air conditioner, the motor comprises a stator and a rotor, the stator is provided with a central shaft hole, the rotor is rotatably arranged in the central shaft hole, the axis of the rotor and the axis of the stator are coaxial, and the outer diameter D1 of the stator and the outer diameter D2 of the rotor meet the relation: 0.51 < = D2 / D1 < = 0.55. The outer diameter D1 of the stator and the outer diameter D2 of the rotor are set to meet the condition that D2 / D1 is larger than or equal to 0.51 and smaller than or equal to 0.55, overall optimization is conducted on the size proportion of the motor, the split ratio of the motor is increased on the basis that miniaturization of the motor is guaranteed, the outer diameter size of the rotor can be relatively increased by increasing the split ratio of the motor, and therefore the arrangement space of magnets can be increased, and the size of the motor is reduced. A proper magnetic load can be obtained; and secondly, the outer diameter of the rotor is relatively increased, so that the rotational inertia of the rotor is also increased, the power density of the motor can be improved, and the efficiency of the motor is improved.

The invention relates to a high-power-density marine split-type permanent magnet shaft generator, which comprises a split-type stator, a split-type rotor and a cooling chamber, and is characterized in that a circulating water channel is arranged on the outer wall of a base of the split-type stator and is connected through a cooling water pipe; an air inlet and an air outlet are formed in two ends of the base; the cooling chamber is integrated at the top of the generator; the split-half rotor comprises a permanent magnet, a rotor core, a rotor support and an expansion sleeve. The rotor core is provided with a plurality of ventilation holes in the axial direction. The generator adopts a stator surface water cooling and forced air cooling mixed cooling system, and a water cooling channel and an air cooling channel operate independently and dissipate heat cooperatively. Through the structural design of the generator, the stator and the rotor of the generator are fully cooled, the heat dissipation efficiency of the generator is improved, and the power density of the generator is improved. A generator rotor permanent magnet is of a tangential structure, and the power density of the generator is further improved. And the ventilation holes are axially added to the rotor iron core, so that the weight of the rotor is reduced, and the influence on the original shafting of the ship is reduced.

The invention discloses a transformer magnetic integration structure integrating double direct current inductors and leakage inductors and an integration method of the transformer magnetic integration structure. In order to solve the related problems that in an existing magnetic integration method, a magnetic core structure is complex in design and large in leakage magnetic flux, and an integration method lacks universality and the like, a single standard EE magnetic core is used for a common type converter with three magnetic element structures including a direct-current inductor, a leakage inductor and a transformer, the winding connection mode and the air gap parameters are reasonably designed, and the magnetic core structure is optimized. Compared with a discrete magnetic part, the number of magnetic elements of the converter can be reduced, the volume proportion of the magnetic part in the converter can be reduced, the volume of a converter system is further reduced, the power density is improved, the magnetic core design is simplified, and the manufacturing complexity of a magnetic integrated structure is reduced; unbalanced current of column windings on the two sides is suppressed, efficient and high-power-density operation of the system is achieved, and stability and reliability of operation of the system are improved.

The utility model discloses a motor, a compressor and refrigeration equipment, the motor comprises a stator, the stator comprises a stator iron core and a winding, the stator iron core is provided with a plurality of stator teeth, the winding is wound on the stator teeth, and a stator slot is defined between two adjacent stator teeth; the rotor is arranged in an inner cavity of the stator, the rotor comprises a rotor iron core and magnets, the rotor iron core is provided with a plurality of installation grooves, the installation grooves are arranged at intervals in the circumferential direction of the rotor iron core, the magnets are suitable for being installed in the installation grooves, the number of stator grooves is Q, the number of poles of the rotor is 2p, the phase number of the winding is m, the outer diameter of the stator is D1, the inner diameter of the stator is D2, and GCD (Q, G, D) is smaller than Q; 2p) is the largest common divisor of the number of the stator slots and the number of the poles of the rotor and satisfies Q / (2pm) lt; 1, 11.2 < = (D2 / D1) (GCD (Q, 2p)) 2 < = 16.5. According to the motor provided by the embodiment of the utility model, the power density of the motor can be improved and the vibration noise of the motor can be reduced by limiting the largest common divisor of the stator slots and the rotor poles and the inner and outer diameters of the stator.

The utility model discloses a nested fuel cell bipolar plate and a fuel cell stack, which relate to the field of fuel cell stack design, and are characterized in that first polar plates and second polar plates are mutually nested, a first side of a first flow channel of each first polar plate is provided with a plurality of first bulges, and the first bulges form first concave blocks on a second side of the first flow channel; a plurality of second protrusions are arranged on the second side of the second flow channel of each second pole plate, the second protrusions form second concave blocks on the first side of the second flow channel, and third flow channels are formed by gaps between the first concave blocks and the second grooves located in the same column in the vertical direction of the first pole plate and the second pole plate and gaps between the second concave blocks and the first grooves. Different from other nested bipolar plates, the third flow channel is crossed with the first flow channel and the second flow channel, and the third flow channel is formed by retracting the first flow channel and the second flow channel by a certain height, so that the height of the flow channel can be reduced by one, the thickness of the bipolar plate is reduced, and the volume power density of a fuel cell is improved.

The invention relates to the field of electrochemical energy storage, and discloses a vanadium redox flow battery stack optimization and performance prediction method, which comprises the following steps: constructing a high-precision reaction kinetic model, and accurately describing the kinetic behavior of an electrode reaction based on a multi-step reaction mechanism, a surface adsorption-desorption process and heterogeneous surface reaction distribution; based on the output of the reaction kinetic model, constructing a multi-physical field coupling model, including ion mass transfer, fluid dynamics and heat transfer models, to cooperatively simulate the ion concentration, fluid flow and temperature field distribution in the galvanic pile; and based on the state variables of the multi-physics field coupling model, constructing a dynamic prediction model of chemical reaction-heat-fluid coupling, and predicting the future performance of the galvanic pile in real time through a long and short term memory network model. According to the method, the energy efficiency, the power density and the service life of the vanadium redox flow battery can be improved, and support is provided for intelligent management and optimization of the vanadium redox flow battery.

The invention provides a battery, a battery pack and a power utilization device, and belongs to the technical field of batteries, the battery comprises a positive plate, a negative plate and an electrolyte; the battery meets the following conditions: # imgabs0 #, V represents the viscosity of the electrolyte, and the unit is mPa.s; pD represents the compaction density of the positive plate, and the unit is g / cm < 3 >; c represents the liquid injection coefficient of the electrolyte, and the unit is g / Ah. According to the battery provided by the embodiment of the invention, by meeting the formula, the good wettability of the electrolyte on the positive plate can be ensured under the condition that the compaction density and the surface density of the positive plate in the battery are relatively high, so that the negative influence caused by the improvement of the compaction density and the surface density is reduced while the battery has high energy density, and the service life of the battery is prolonged. The charge transfer efficiency is improved, the battery cycle performance is optimized, the battery power density is improved, and the comprehensive performance of the battery is improved.

The invention relates to the technical field of hybrid aircrafts, and discloses a high-power take-off energy supply system for a hybrid aircraft based on superconducting magnetic energy storage, which is characterized in that a superconducting coil is directly soaked in a hydrogen storage tank of the aircraft, and a large amount of liquid hydrogen carried by the aircraft is used as a cold source of the superconducting coil; the weight of a refrigerating machine and a heat preservation tank which are necessary for original superconducting magnetic energy storage is saved; when the aircraft is in a scene with low power requirements such as level flight or landing, the power generated by the superconducting generator driven by the gas turbine is greater than the power required by the aircraft, and at the moment, the superconducting coil can be charged to realize energy recovery and storage; under the scene of high power demand such as takeoff, the advantages of high power density, high response speed and the like of the superconducting coil are utilized to provide electric power for the propulsion unit so as to meet the high-power demand of the aircraft in the stages such as takeoff and the like, and the high-power maneuvering, electric energy management and transmission capabilities of the hybrid aircraft are greatly improved.

The invention discloses an energy storage type underwater vehicle follow-up power generation system, relates to an underwater vehicle power generation system, and aims to solve the problem that an existing ocean temperature difference power generation system is difficult to be directly applied to the underwater vehicle follow-up power generation system. A warm sea water pump is communicated with an evaporator; a dead steam working medium outlet of the evaporator is communicated with a dead steam working medium inlet of the turbine generator set; a dead steam working medium outlet of the turbine generator set is communicated with a dead steam working medium inlet of the power type cold storage condenser; a dead steam working medium outlet of the power type cold storage condenser is communicated with a dead steam working medium inlet of the working medium pump through a liquid storage tank; the turbine generator set drives the generator to generate electricity; a cold seawater inlet of the cold seawater pump is communicated with the outside of the aircraft body; a cold seawater outlet of the cold seawater pump is communicated with a cold seawater inlet of the power type cold storage condenser; a cold seawater outlet of the power type cold storage condenser is formed in the outer portion of the aircraft body. The beneficial effect is that the generated power and the generated power density are greatly improved.

The invention belongs to the field of brushless doubly-fed motor control, and particularly discloses a low-bus-capacitor brushless doubly-fed direct-current power generation system direct-current voltage ripple suppression device which comprises a brushless doubly-fed direct-current power generation system, a machine-side converter control system and a direct-current voltage ripple suppression control system. The machine-side converter control system is connected with the machine-side converter and is used for controlling the direct-current bus voltage and suppressing harmonic voltage of a first target number of times of the direct-current bus voltage by adopting a control winding harmonic current compensation method; the direct current voltage ripple suppression control system is connected with the direct current bus and is used for separating harmonic voltage of a first target number of times of the direct current bus voltage and obtaining a harmonic current reference value of a second target number of times of the control winding; the active suppression of the direct-current bus voltage ripple is realized by integrating the harmonic voltage and the harmonic current reference value of the direct-current bus voltage. According to the invention, the system power density is ensured, and the electric energy quality is improved.

The invention belongs to the technical field of high-frequency planar transformers, and relates to a butterfly-shaped planar transformer with a twisted primary side and an anti-coupling secondary side and a switching power supply. The winding comprises a primary winding and a secondary winding; the magnetic core is of a four-core-column butterfly-shaped structure, and the secondary winding and the primary winding respectively surround two core columns in the center of the magnetic core; the winding directions of the secondary winding current around the two middle columns of the magnetic core are the same; the primary winding is positively coupled with one secondary winding and reversely coupled with the other secondary winding; according to the two-core-column matrix type transformer, the problem that magnetic saturation is caused by the magnetic flux of direct-current magnetic bias at the connecting part of the transformer is solved, so that the two-core-column matrix type transformer can be applied to a switching power supply with direct-current magnetic bias and a power electronic converter; compared with a traditional scheme, the efficiency and the power density of the transformer are remarkably improved.

The invention discloses an adjustable wide-adaptation MOSFET turn-off gate drive circuit and a drive method, and relates to the field of power electronics, and the drive circuit matches parasitic parameters of a to-be-controlled power MOSFET through parameter configuration so as to improve the applicability. In the turn-off process of the to-be-controlled power MOSFET, the circuit controls the grid voltage to be rapidly decreased at the stage higher than the Miller platform, to be kept at the Miller platform voltage during the Miller platform, to be linearly decreased at the stage from the Miller platform to the threshold voltage, and to be rapidly decreased below the threshold voltage. Through continuous fine control of grid voltage, drain-source side voltage and current track regulation and control are realized. The problems that according to an existing turn-off driving circuit, grid voltage is difficult to finely regulate and control in the turn-off process of a power MOSFET device, voltage and current tracks on the drain side and the source side of the power MOSFET cannot be finely regulated and controlled independently, the targets of low voltage overshoot and low turn-off loss are difficult to meet in the turn-off process at the same time, limited application of the power MOSFET device is difficult to achieve, and the turn-off efficiency of the power MOSFET device is low are solved. And the high power density requirement of the power electronic device is difficult to meet.