1282 results about "High power density" patented technology

The invention discloses a heat dissipation optimization method and system for a power device based on heat flow path reconstruction, and aims to improve the heat dissipation efficiency of the power device in the working process and reduce the adverse effect of thermal stress on the performance and service life of the device. The method comprises the following steps: firstly, acquiring real-time temperature field distribution data of a target power module during the working period of a power device, and determining an initial heat flow path of the module based on the data; performing heat sensitivity analysis on each component in the target power module; identifying a heat flow shielding area according to the heat sensitive data, and reconstructing the initial heat flow path on this basis to generate an optimized heat flow path; and finally, an efficient heat dissipation channel is constructed according to the optimized heat flow path, so that effective heat dissipation optimization of the power device is realized. The method can dynamically identify the thermal bottleneck and actively optimize the heat dissipation path, is suitable for thermal management design of high-power-density electronic equipment, and has high engineering practical value.

The invention discloses a semiconductor power device high-efficiency heat dissipation structure based on a micro-channel liquid cooling technology, which comprises a thermoelectric refrigeration module, a phase change material layer, a micro-channel liquid cooling module, a bionic micro-channel structure, an intelligent regulation and control module and a full-packaging module, and is characterized in that the thermoelectric refrigeration module is arranged on the surface of a hot spot area of a power device, and the periphery of the thermoelectric refrigeration module is coated with the phase change material layer; the micro-channel liquid cooling module is embedded into the packaging substrate and matched with the bionic micro-channel structure, the intelligent regulation and control module collects data in real time through the sensor group and dynamically adjusts heat dissipation parameters, and the full-packaging module achieves integrated packaging. The problems that an existing heat dissipation technology is low in efficiency, uneven in temperature distribution, insufficient in intelligent degree and the like are solved, and a more reliable and efficient heat dissipation scheme is provided for high-power-density devices.

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 relates to the technical field of chip heat dissipation, and provides an immersed heat dissipation system with liquid nitrogen as a cooling medium and an integrated circuit assembly. In an immersed heat dissipation system with liquid nitrogen as a cooling medium, huge heat generated by a high-power-density chip under an extreme working condition can be efficiently absorbed and taken away under the extremely low working temperature and the large phase change heat absorption capacity, the heat transfer limit of a traditional cooling technology is broken through, and deep cooling of the chip is achieved; meanwhile, the liquid nitrogen is non-conductive and stable in chemical property, the electrical short circuit risk and physical and chemical corrosion problems caused by leakage of the cooling working medium are thoroughly eliminated, and the long-term operation reliability and safety of the immersed heat dissipation system with the liquid nitrogen as the cooling medium are remarkably improved. Therefore, stable operation of the chip under high load is guaranteed, physical damage and performance frequency reduction caused by overheating are avoided, and even favorable conditions are created for safe and efficient operation of the chip under higher working frequency.

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 belongs to the technical field of semiconductor device packaging, and discloses a power semiconductor module three-dimensional stacking vertical commutation low-inductance packaging structure. The two vertical commutation structures are stacked and integrated on the same substrate; different from traditional two-dimensional packaging in which all elements are laid on a two-dimensional plane, three-dimensional stacked packaging suitable for power devices is proposed for the first time, and power loops are stacked and integrated; the magnetic fluxes of the stacked power loops are cancelled, so that ultra-low inductance (pH level) integration is realized; under the condition that the areas of the substrates are the same, the capacity of the module is doubled; meanwhile, dynamic current sharing design is considered, and one driving chip simultaneously drives eight GaN chips to realize parallel dynamic current sharing for the first time; the method is suitable for various topological structures including half-bridge structures, full-bridge structures, three-level ANPC structures and the like; the method is suitable for various packaging schemes, including PCB on DBC packaging, DBC substrate welding / sintering packaging and embedded packaging. Taking the packaging of the half-bridge module double-sided parallel PCB on DBC as an example, low-inductance, low-thermal-resistance and high-power-density integration is realized.

The invention discloses an AMB substrate embedded PCB packaging integrated power module and a manufacturing method thereof, and the method comprises the steps: a power chip is mounted on an AMB substrate, a first insulating dielectric layer, a first metal layer, a second insulating dielectric layer and a second insulating metal layer are sequentially pressed on the power chip and the AMB substrate from bottom to top, and the first metal layer and the second metal layer are provided with current paths through etching; a metal conduction hole for connecting the first metal layer with the AMB substrate and the power chip is formed in the first insulating dielectric layer; and a metal conduction hole for connecting the first metal layer with the second metal layer is formed in the second insulating metal layer. According to the AMB embedded PCB power module, the integration level of an electric drive assembly is improved, meanwhile, circuit paths are reduced through PCB lamination and metal conduction hole modes, stray inductance and thermal resistance are reduced, and the AMB embedded PCB power module has the advantages of being high in power density, short in current path, small in stray inductance, low in thermal resistance and the like.

The invention relates to the technical field of inductors, in particular to an inorganic insulation integrally-formed power inductor and a preparation method thereof. The method comprises the following steps: S1, selecting a coil; s2, pre-stretching the coil; s3, pre-coating of inorganic powder is carried out; s4, pressing the magnetic powder; s5, sintering the ceramic layer at high temperature; and S6, integrally forming the inductor. By reasonably selecting the material and shape of the coil and the type of the magnetic powder and combining high-temperature sintering at the temperature of 250 DEG C or above, the magnetic conductivity and the bias resistance are improved, the diversified requirements of high frequency, high temperature, high power density and the like are met, and the performance of insulation, heat conduction and the like can be optimized; according to the integrated forming process, coil pre-packaging and magnetic core forming are completed in one step, production procedures are reduced, process integration and production efficiency are improved, production cost is reduced, the utilization rate of a magnetic core window reaches 100%, and the product size is reduced.

The invention belongs to the technical field of energy storage cooling, and particularly relates to a cooling circulation system and an equipment cooling method, and the cooling circulation system comprises a liquid inlet system, a heat exchange system and a liquid outlet system. The heat exchange system comprises a plurality of heat exchange units which are connected in parallel; the liquid inlet system is connected with the input end of the heat exchange system, and a pressure detection device, a liquid temperature measurement device I, a pollution discharge degassing tank and a liquid circulation driving unit are connected into the liquid inlet system; the liquid outlet system is connected with the output end of the heat exchange system, and a conductivity detection device, an outlet pressure detection device and a liquid temperature measurement device II are connected into the liquid outlet system. Through dynamic modular adjustment, multi-parameter intelligent control, energy-saving composite heat dissipation and high-reliability design, the problems of low heat dissipation efficiency, high energy consumption, high maintenance cost, poor adaptability and the like in the prior art are effectively solved; and particularly, the method has remarkable advantages in the aspects of precise heat dissipation of high-power-density equipment, stable operation under complex working conditions and full-life-cycle cost control.

The invention is suitable for the technical field of hovercar control, and provides a thermal-vibration-weight collaborative optimization method of a high-power-density hovercar controller, and the method comprises the steps: constructing a three-dimensional housing structure based on fractal mechanics, achieving 35-45% of weight reduction through bionic design, and remarkably reducing the weight while guaranteeing the structural strength; thermal management, electromagnetic compatibility and vibration suppression collaborative optimization layout is established, a high-heating-power module is arranged near a heat dissipation air opening, and a sensitive control unit is arranged in a center damping area of a shell; a gradient material distribution scheme is adopted, a high-heat-conduction composite material is configured in a high-heat-flow area, and a high-damping material is adopted in a vibration sensitive area. Under the high-power working condition, the heat dissipation performance of the controller is improved, vibration transmission is reduced, the overall weight is reduced, and high-reliability control hardware support is provided for the hovercar.

The invention relates to the technical field of permanent magnet generators, and discloses a high-speed high-power-density transverse flux permanent magnet generator which comprises a machine shell assembly, a power generation unit body is arranged in the machine shell assembly, the power generation unit body comprises a stator assembly and a rotor assembly, and the rotor assembly rotates in the stator assembly to achieve power generation; the stator assembly comprises a winding cooling mechanism and a concentrated winding, the winding cooling mechanism comprises a front semi-ring cooling sleeve, a rear semi-ring cooling sleeve, an upper diversion bridge and a lower diversion bridge, the front semi-ring cooling sleeve and the rear semi-ring cooling sleeve are buckled to form a winding cooling ring, and an inner ring flow channel, a mounting ring cavity and an outer ring flow channel which are concentric are formed in the winding cooling ring; the upper diversion bridge and the lower diversion bridge are used for communicating the inner ring flow channel with the outer ring flow channel to form a cooling passage, and the concentrated winding is adaptively arranged in the mounting ring cavity, so that the winding can be directly cooled in the generator, and the contradiction between multi-polarization and high-speed and high-frequency is effectively relieved; the torque density and the rotating speed range of the transverse flux permanent magnet generator can be simultaneously improved.

The invention discloses a manufacturing method of an encapsulation type driver transformer with high heat dissipation efficiency, and belongs to the technical field of power electronic equipment manufacturing. The invention aims to solve the technical problems of low heat dissipation efficiency and insufficient long-term reliability caused by limited heat-conducting property of a potting material, simple surface heat dissipation structure and difficulty in coordination of internal thermal stress of the existing driver transformer. The method comprises the following steps: constructing a three-dimensional digital model of a reinforced heat dissipation structure with a boss array and a groove array, and preparing a corresponding forming mold; a magnetic core and a winding are used as inserts to be positioned in a mold cavity, insulating colloids with different mechanical and heat conduction characteristics are poured in a vacuum environment in batches, internal gaps are fully filled with flexible colloids and stress is buffered through a segmented curing process, meanwhile, high-heat-conduction rigid colloids form an external main body and a heat dissipation structure, and an integrated potting body is formed. The method is used for manufacturing the driver transformer suitable for scenes with high power density and high heat dissipation requirements, and the heat dissipation capability and the operation reliability of the driver transformer can be remarkably improved.

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 heat dissipation composite material and a preparation method and application thereof. The heat dissipation composite material comprises a bonding layer, an insulating breathable layer, a heat conduction layer and a heat conduction diffusion layer which are sequentially arranged from bottom to top. Wherein the bonding layer is obtained by mixing and reacting a polymer matrix material, a composite filler and a molecular bridging agent, the insulating breathable layer is a porous insulating material, the heat conduction layer is a graphene film, and the heat conduction diffusion layer is prepared from porous matrix composite heat conduction nanoparticles. According to the invention, through combination and structural design of each layer of material, a synergistic effect of a multi-layer structure is realized, firm and stable bonding of the heat dissipation composite material and a heating electronic device is realized, the heat dissipation efficiency and insulation air permeability of the heat dissipation composite material are remarkably improved, and the heat dissipation requirement of high-power-density electronic equipment can be met.

A modular and scalable AC / DC substation transforms AC voltage to DC voltage for driving a high-voltage and high-current load, such as a heavy work machine. Sized to fit within a standard high-cube ISO shipping container, the substation includes a main transformer attached at a center of a rectangular base with a pair of controlled rectifiers positioned on the base downstream from the main transformer, aligned parallel to a lateral axis of the base, and substantially symmetrical to a longitudinal axis of the base. The arrangement of these components on the base, together with lowpass filters and switchgear, achieves high power density for the substation, provides balanced mass for stability during shipment and placement, and helps protect personnel from accidental electrical arcing.

The invention provides an electro-hydraulic composite rotation control system, and relates to the technical field of hydraulic transmission, the system combines the speed control advantage of motor driving and the high power density characteristic of hydraulic driving, and the stability, high efficiency and high power output in the rotation process are considered; the system mainly comprises a driving motor, a main pump, a four-quadrant pump / motor and other components, dynamic response and closed-loop control between the motor and the hydraulic pump / motor are achieved through an electro-hydraulic composite coordination control strategy and an optimal torque distribution algorithm based on a genetic algorithm, the starting and braking time is effectively shortened, and the rotation efficiency is improved. In the rotary braking process, kinetic energy is converted into hydraulic energy or electric energy to be stored through the energy recovery function of the four-quadrant pump / motor and the electric power generation all-in-one machine, and the energy recovery efficiency is improved. In addition, the system has the capability of outputting torque by assisting the four-quadrant pump / motor under special working conditions, and the adaptability and stability of the system are further enhanced.

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 invention provides a high-power filter based on fractional order positive and negative inductor parallel connection and a control method, and the filter comprises a fractional order negative inductor # imgabs0 # and a positive inductor # imgabs1 # which are connected in parallel. The fractional order negative inductor # imgabs2 comprises a first switch tube V1, a second switch tube V2, a third switch tube V3, a fourth switch tube V4, filter inductors L1 and L2, a filter capacitor Cf, a filter damper Rf, a grounding capacitor Cg, a sampling resistor R, a DC-DC conversion circuit, a self-powered module, an MCU controller, a digital-to-analog converter AD and a sine pulse width modulation module SPWM. According to the scheme, the inductance value and the order of the fractional-order inductor can be changed at will by changing the parameters of the MCU controller, so that the inductance value of the high-power filter with the fractional-order positive and negative inductors connected in parallel is changed, and low cost, small size, high power density and flexible and adjustable order and inductance value of the filter inductor are realized; and the method can be applied to a high-power scene with relatively high harmonic content, and a better filtering effect is achieved.

The invention discloses a similar mixed redox electrolyte and an aqueous organic flow battery, and belongs to the technical field of organic flow batteries. The similar mixed redox electrolyte can be used for a positive electrode or a negative electrode, at least two cyclic nitroxide free radical active substances are introduced into the positive electrode electrolyte, and at least two viologen active substances are introduced into the negative electrode electrolyte. Derivative molecules with different substituent groups or bridging atoms but the same type are introduced into a positive electrolyte and a negative electrolyte respectively, and the same charge groups or charged atoms are carried in the substituent groups, so that the molecular structure is stabilized by increasing the intermolecular distance or weak interaction of hydrogen bonds and the like through intermolecular electrostatic repulsive force; the distribution state of molecules in the solution is regulated and controlled, the molecular aggregation behavior is reduced, and the battery capacity and the cycling stability are improved. The introduction of the charged active substance can enhance the rate capability of the battery, is beneficial to the realization of higher power density, and provides a new idea for the design and application of the high-performance aqueous organic flow battery.

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.

Embodiments described herein relate to divided energy electrochemical cells and electrochemical cell systems. Divided energy electrochemical cells and electrochemical cell systems include a first electrochemical cell and a second electrochemical cell connected in parallel. Both electrochemical cells include a cathode disposed on a cathode current collector, an anode disposed on an anode current collector, and a separator disposed between the anode and the cathode. In some embodiments, the first electrochemical cell can have different performance properties from the second electrochemical cell. For example, the first electrochemical cell can have a high energy density while the second electrochemical cell can have a high power density. In some embodiments, the first electrochemical cell can have a battery chemistry, thickness, or any other physical / chemical property different from those properties of the second electrochemical cell.

The invention discloses an efficient cooling driving motor for an electric industrial vehicle, which comprises a motor main body, the motor main body comprises a stator and a rotor, and the end part of a non-bearing end of a rotor rotating shaft is of a hollow structure; and the water cooling assembly comprises a rotating block, a liquid inlet pipe and a liquid outlet ring, a plurality of cooling pipes are arranged on the outer side of the rotating block in the circumferential direction, and one end of each cooling pipe is connected with the liquid outlet ring in a penetrating mode through the two sides of the stator. Cooling liquid firstly flows through the rotating hollow rotating shaft of the rotor to directly absorb eddy-current loss of a rotor core and winding heat, then is shunted to the cooling pipes on two sides of the stator through the rotating block, and absorbs heat of the stator core and the winding through the stator position, so that synchronous water cooling of a rotating part and a static part is realized; and an internal water cooling-external air cooling three-dimensional heat dissipation network is formed by matching with the air cooling assembly, so that the internal temperature difference of the motor is greatly reduced, performance degradation caused by local overheating is effectively inhibited, and a core guarantee is provided for high-power-density application and long-service-life operation of the motor.

The invention relates to the technical field of energy storage and power supply, in particular to a frequency optimization control method of a composite energy storage system based on a virtual synchronous machine. High-frequency disturbance quick response is achieved through the high-power density characteristic of the super-capacitor, through dynamic power distribution, the super-capacitor preferentially bears more than 80% of power fluctuation in a high-frequency small-disturbance scene, frequent charging and discharging of the lithium-iron battery are avoided, the lithium-iron battery participates in long-term adjustment in a low-frequency large-deviation scene, and in combination with assistance of the super-capacitor, high-frequency disturbance quick response is achieved. The system frequency recovery time is shortened, decoupling control of energy type and power type energy storage is achieved through the DC / DC converters in the sub-modules, the direct current bus voltage is kept stable, meanwhile, the discharge depth of the lithium iron battery and the super capacitor is improved, and the overall capacity requirement and cost of the energy storage system are reduced.

The invention relates to the technical field of power electronics, and discloses a single-stage bidirectional DC / AC converter and a control method thereof. The single-stage bidirectional DC / AC converter comprises a pre-stage circuit and a post-stage circuit which are multiplexed by a switching tube. Wherein the pre-stage circuit is an L-LLC resonant converter or a CLLC resonant converter, and the post-stage circuit is an interleaved Buck converter. And an output inverter bridge at the secondary side of the transformer is replaced by a bridgeless structure. According to the single-stage bidirectional DC / AC converter, the number of switching tubes is reduced through a multiplexing technology, the topological structure can be simplified, the stability is improved by reducing the damage probability, and the cost is reduced; furthermore, by utilizing a soft switching technology of a pre-stage circuit, ZVS of four primary-side switching tubes and half secondary-side switching tubes can be realized, the switching loss is greatly reduced, and the working efficiency is improved; an output inverter bridge is omitted, the number of switching tubes can be further reduced, and the power density and the working efficiency are improved.

According to the control circuit and the control method of the vehicle charger disclosed by the invention, the rectifier bridge of the bridge PFC is removed, so that the number of switching devices is reduced, the topological cost is reduced, and the loss is reduced; power factor correction is realized through average current control, and stable 400V direct current is output for post-stage power supply after power grid side 220V alternating current is rectified; the rear-stage resonant converter is highly symmetrical in structure and has the advantages of high power density, strong energy interactivity, input and output isolation and easy realization of soft switching; a hybrid modulation strategy is adopted for the resonant converter, frequency modulation and extended phase shift segmented modulation are adopted under the normal load condition, the problem that the frequency modulation range is narrow during voltage reduction is solved, intermittent Bang-Bang charge control is switched under the light load condition, and the problems that the output voltage drift is high and the efficiency is reduced during light load are solved; therefore, the charging efficiency of the vehicle-mounted charger is improved.

The invention discloses a control method and system for a single-stage three-port V2G charging device, and relates to the technical field of charging pile converters, and the method comprises the steps: constructing a structure of a three-port converter, and obtaining a working mode of the converter; a phase shift control mode is adopted between the ports and between the two bridge arms of the full-bridge circuit; bidirectional power flow of energy between a power grid and a new energy automobile battery is completed, and multifunctional charging and discharging management is achieved. The converter is of a single-stage structure and has high power density, and flexible and bidirectional power exchange between alternating current and direct current ports can be achieved without a two-stage structure. In order to improve the efficiency of the converter, a phase shift angle is calculated by taking power as a constraint condition and taking current stress and soft switching as optimization targets, a three-port converter optimization modulation strategy which is suitable for the topology and takes a wide soft switching range and low current stress into account is designed, and efficient and reliable operation of the converter in three working modes of V2G, G2V and H2L can be realized.

The invention discloses a wire connecting structure of a flat wire stator, and belongs to the technical field of energy-saving motors, the wire connecting structure comprises a stator core and a stator slot, a winding is arranged in the stator slot, the stator core and the winding form a stator, the stator is a concentrated winding type stator, the longitudinal section of the winding is of an octagonal structure, and the winding is arranged in the stator slot. And the left and right sides of the windings can be broken to reduce the number of used molds and reduce the winding difficulty of the windings, and one end of each of two outgoing lines of each group of windings is on the outer diameter side of the stator while the other end is on the inner diameter side of the stator. According to the wire connecting structure of the flat wire stator, the cross section of the winding is of an octagonal structure, folding can be carried out on the two sides, the number of molds can be reduced, the winding difficulty of the winding can be reduced, compared with a traditional winding with a rectangular cross section, the slot fullness rate can be increased by 4%-8%, the end space is small, the number of opened molds is reduced, the winding difficulty of the winding is reduced, the cost is reduced, and the slot fullness rate, the power density and the efficiency are high.

According to the motor, the power system based on the motor and the adjusting method, convex ribs are arranged on an end plate of a rotor, the rotor is used for driving the convex ribs to rotate and driving cooling lubricating oil to form forced circulation in an air gap, the heat transfer efficiency of the rotor and a stator is remarkably enhanced, and the temperature rise of the rotor and the demagnetization risk of a permanent magnet are effectively controlled; meanwhile, the lubrication condition of moving parts is improved, and energy consumption and complexity caused by an extra oil pump are avoided; through the integrated design of the motor shell and a half box body of the gear box and the communicating oil duct of the sealing plate and the gear box, a shared lubricating system is constructed, cooling lubricating oil circulation sharing and heat dissipation cooperation are achieved, the overall structure is simplified, and the system reliability is improved; on the premise that the size and the weight are not increased basically, the comprehensive benefits of improving the heat dissipation performance, simplifying the system structure and reducing the manufacturing cost are synchronously achieved, and the power module is particularly suitable for application scenes with limited space and high power density requirements.

The invention belongs to the technical field of heat dissipation of high-power-density electronic devices, and relates to a topological cold plate and vapor chamber integrated structure which comprises a cover plate, a first heat exchange plate and a second heat exchange plate which are sequentially overlapped from top to bottom and are connected in a sealed mode to form the integrated structure, and a cooling cavity used for containing a liquid working medium is defined between the cover plate and the first heat exchange plate. A phase change cavity used for containing a two-phase heat transfer working medium is defined between the first heat exchange plate and the second heat exchange plate, the cooling cavity and the phase change cavity are independent of each other, and heat transfer is achieved through the solid metal wall face of the first heat exchange plate. During use, the second heat exchange plate is attached to an electronic device, heat generated when the electronic device works is transferred to the second heat exchange plate, so that the two-phase heat transfer working medium in the phase change cavity is evaporated to generate steam, and the steam is diffused in the phase change cavity, then is in contact with the upper wall surface, is condensed when encountering cold and releases latent heat; heat is conducted to the cooling cavity through the first heat exchange plate to be absorbed by the liquid working medium. The structure is compact, the temperature equalizing performance is enhanced, and the heat transfer efficiency is improved.

The invention belongs to the technical field of power electronics, and discloses a global efficiency optimization-based four-switch Buck-Boost + LLC integrated topology modulation method, which comprises the following steps of: determining an optimal working point under a specified working condition point through three constraint conditions of gain, soft switching and loss according to three degrees of freedom, namely two duty ratios d1 and d2 and a phase shift angle phi; and pulse width modulation and phase shift modulation are carried out on the integrated topology. Correspondingly, the invention provides a controller which is used for executing the specific steps of the modulation method of the four-switch Buck-Boost + LLC integrated topology based on global efficiency optimization in the invention. According to the modulation strategy provided by the invention, the loss of the four-switch Buck-Boost + LLC integrated topology in a wide input range can be reduced while soft switching in a full-load range is ensured, and an external circuit does not need to be additionally arranged, so that the integrated topology has high power density and high efficiency.