286results about How to "Reduce no-load loss" patented technology

This invention relates to a load capacitance and voltage regulation switch characterizing in the following structure: a voltage-regulation static contactor is mounted on an insulated drum of a load capacitance-regulation part, a voltage -regulating bracket is set in the drum, a voltage-regulation dynamic contactor and a transition resistor are set on the bracket to integrate the load capacitance and voltage regulation, a set of operation unit is used between the quick unit of the capacitance and the voltage regulation parts by an electromagnetic clutch and an electric control box is set for adjusting capacitance and voltage automatically according to the change of loading current and voltage of a transformer.

The invention relates to a coating method of a winding amorphous iron core insulating coating. The coating method comprises a first step that a whole amorphous iron core is arranged in epoxy glue to conduct vacuum impregnation, a second step that the surface of the amorphous iron core is coated with epoxy resin, and a third step of heating and solidifying after the amorphous iron core is coated with the modified epoxy glue coating. Gaps between amorphous strips are sealed and have certain strength after the epoxy glue impregnation, the coating is neat in surface and uniform in thickness, vibration and noises of the iron core are reduced, and integrated installation is convenient. The coating is thinner than general coating technique and solidifying time is shortened. The epoxy glue enables solidifying contraction percentage to be low, the epoxy glue coating has good adhesiveness and elasticity and has little stress to the iron core, and the coating has little influence on initial magnet conductivity and inductance of the amorphous iron core. The amorphous iron core dealt with the coating method can greatly reduce no-load loss.

The invention relates to an energy router device applied to an intelligent distributed energy network. The energy router device comprises an A unit being a three-phase pulse width modulation (PWM) bidirectional rectification unit, a B unit being an isolation-type bidirectional soft switch Cuk conversion unit, a C unit being a dual-active DC/DC conversion unit, a D unit being a three-phase four-wire soft switch inversion unit, an E unit being a soft switch single-phase full-bridge bidirectional inversion unit and an F unit being a photovoltaic Boost conversion unit and also comprises a first DChigh-voltage bus and a second DC low-voltage bus, wherein the dual-active DC/DC conversion unit comprises a closely-coupling high-frequency transformer, soft switching of each unit can be achieved byan auxiliary circuit or a control strategy, the energy loss and the loss of a switch tube device are greatly reduced. The distributed energy network is divided into three layers of power grid tree-shaped architectures by the intelligent distributed network technology, and the router is applied to a power distribution network and a micro power grid to complete different functions.

The invention discloses a flyback convertor controlled by a self-oscillation start output end, which comprises a flyback power conversion main circuit, a start oscillation circuit, a cut-off device and a PWM control circuit. The start oscillation circuit is connected with an MOS main switch tube grid in the flyback power conversion main circuit, and the cut-off device is connected in a return circuit of the start oscillation circuit. The PWM control circuit outputs two paths of signals, one path of trigger signal is connected to the cut-off control end of the cut-off device for controlling the cut-off of the start oscillation circuit, and the other path of PWM drive signal is connected to the MOS main switch tube grid in the flyback power conversion main circuit. The invention has the following characteristics that the flyback convertor does not need an extra auxiliary power supply to supply power to the PWM control circuit, easily realizes the control mode of synchronous rectification, and also easily realizes various protective circuits, and additional functions such as parallel current equalization, and so on; and the band width of a control loop is not limited to make the dynamic performance of the circuit better.

The invention relates to a Bluetooth control-based wireless electric energy transmission apparatus. A rectifying module converts mains supply into a direct current to be sent to a high-frequency inversion module; a Bluetooth module in the high-frequency inversion module receives a signal from a receiving end and performs judgment to output a control signal to a driving module to control operation of the inversion module; the inversion module outputs a high-frequency alternating current to be transmitted outwards through modes of a transmitting inductive coil and capacitive resonance; an electromagnetic receiving module receives energy, and the energy is converted into a direct current through a rectifying and filtering module to be output to an auxiliary power supply module; the auxiliary power supply module converts a voltage into a voltage which is required by a load and a chip; and a sampling module samples the voltage and current at the input end of the auxiliary power supply module, processes the sampled voltage and current and transmits the processed voltage and current through the Bluetooth module at the receiving end. An E type inversion circuit is adopted, so that the advantages of simple circuit, easy control, low cost and the like can be achieved; and in addition, after Bluetooth control is added, no-load loss can be lowered, overvoltage current and near-distance protection can be realized, the transmission efficiency can be improved, and the problems existing in multi-load voltage matching and the like can be solved.

The present invention belonging to a power control device and more particularly relates to the transformer load control caused by multiple charging piles. The technical scheme is that the system comprises a controller host machine (1), a plurality of controller extension machines (2) arranged at charging piles (5) and a communication bus (3) which is connected between the controller host machine (1) and the controller extension machines (2). By applying the system and the method, all charging piles in a housing estate can be controlled in real time, a power use peak is staggered, construction investment can be reduced for new residential housing estates and enterprises, transformer zero load loss can be reduced, and electrical system transformation difficulty and cost can be greatly reduced for a built housing estate with the need of adding charging piles.

The invention, which relates to the technical field of energy systems, provides an energy router device applied to wind-light energy storage and a control method thereof. The device comprises a bidirectional rectifying unit, a resonant bidirectional DC-DC conversion unit, a photovoltaic Boost transform unit, a bidirectional DC-DC conversion unit, a soft switching single-phase full-bridge inverterunit, a three-phase PWM rectifying unit, a high-voltage direct-current bus, a low-voltage direct-current bus, a DSP controller, a voltage sensor and a current sensor. Meanwhile, on the basis of a hybrid energy storage coordinated control strategy of a stochastic robust optimization method, the device has seven kinds of working modes. In addition, the invention also provides a control method of anenergy router device applied to wind-light energy storage. According to the invention, on the basis of the multi-unit topological structure, the electric energy with various voltage levels can be provided and various load and energy storage device's needs are met; and the photovoltaic-fan complementary power generation is realized by the control method and the hardware structure.

The invention discloses a phase shift balancing device of an 18-pulse rectifier. The phase shift balancing device comprises a phase shift auto-transformer and a three-phase balancing electric reactor, wherein the phase shift auto-transformer has a group of inputs with 3fai 380V and two groups of outputs 3fai 380V, and two groups of outputs respectively shift phases at the same angle toward the opposite direction. The impedance of the three-phase balancing electric reactor is matched with the phase shift auto-transformer, and input end of the three-phase balancing electric reactor is connected with the input end of the phase shift auto-transformer and correspond to the phase shift auto-transformer in phase. The input end of the phase shift auto-transformer is connected with a grid side power supply, and the two groups of outputs of the phase shift auto-transformer and an output of the three-phase balancing electric reactor are balanced to form a part of the rectifier to supply electricity. The phase shift balancing device of the 18-pulse rectifier consists of a polygonal auto-transformer and the three-phase balancing electric reactor with small capability, calculated capability is about 17% of calculated capability of a traditional extending-edge connecting phase-shifting transformer, materials are saved, product volume and weight are decreased, and the product cost is reduced.

A mining explosion-proof all-insulation dry type transformer with an amorphous alloy iron core for a mobile transformer substation comprises an integral winding, the iron core, an upper clamp, a lower clamp and a shell, wherein the integral winding includes low-voltage coils and high-voltage coils. The mining explosion-proof all-insulation dry type transformer is characterized in that insulation layers are arranged among layers of the low-voltage coils, the high-voltage coils are arranged on the outer layer of the low-voltage coils, each insulation layer is arranged between each two adjacent layers of the high-voltage coils, an outer insulation layer covers the high-voltage coil, and the integral winding has the square section. The iron core is the amorphous alloy iron core, and an assembling lap joint of the iron core is arranged on the lower portion. The upper clamp and the lower clamp are non-metallic parts cast by epoxy resin and reinforced by filled glass fibers, the U-shaped sections of the upper clamp and the lower clamp cap the upper yoke and the lower yoke to press the upper end face and the lower end face of the winding and are fastened by pull bolts, and the pull bolts are symmetrically mounted on the low-voltage side and the high-voltage side to fasten the upper clamp and the lower clamp. The mining explosion-proof all-insulation dry type transformer has the advantages of long service life, low loss, low noise, no maintenance or pollution, high reliability, flame retardance, fire resistance, recyclability after being used up and the like.

The invention provides a coordinated control method for a low-voltage flexible distribution network power supply system. The system comprises four distribution transformers T1-T4, four sections of 400V low-voltage AC (alternating current) buses and four flexible DC (direct current) converters, wherein the four sections of 400V low-voltage AC buses are connected through bus coupler switches; a DC bus is further connected to an energy storage system and a distributed photovoltaic system. The coordinated control method is used for performing coordinated control for different fault conditions of bus coupler switch fault, incoming line power loss, flexible direct current converter fault, energy storage converter fault and photovoltaic converter fault in different operation modes. According to the system, interconnection of multiple lines of the distribution network is realized by the flexible DC converters, power wheeling support between the lines is realized, and after a certain distribution line fails and breaks, the flexible DC converters perform islanded operation with load; meanwhile, interconnection is realized on the DC link with photovoltaic and energy storage systems, and an optical storage and flexible DC combined hybrid system is formed.

An intelligent power supply applied to elevator relates to a power electronic topology scheme to adopt high frequency switch energy transformation technology and digitalized phase sequence detection technology to integrate a plurality of (generally 6) components or devices related to elevator assistant power supply in a current elevator control system into a circuit board. Power transformation canbe obtained all by changing high frequency transformer switches, the phase sequence protection can be realized by software, DC band-type brake is subject to rated incitation (110V or 200V), reduced rate maintenance (80V/160V), thus saving contactor and access of power resistance, simplifying circuit, reducing energy consumption and improving reliability. The 220V power required by the elevator toseparate from the grid can also be obtained by high frequency transformation, thus greatly reducing volume and idle loss, and fully electronizing and intelligentizing the plurality of (generally 6) components in the current system with no contact points, weight/volume being 20-30% of the original weight/volume and cost being around half of the original cost, saving quantities of copper, saving energy consumption (no energy consumption resistance), really realizing integration of intelligence and environment protection, decoupling all the parts, and totally not influencing other circuits by cutting out solely when short pass occurs to a gate machine circuit.

The invention relates to the technical field of motor manufacture, in particular to a method for manufacturing an amorphous alloy stator iron core of a high-frequency motor. The method comprises the following steps of: sufficiently and uniformly mixing amorphous alloy powder and an adhesive, wherein conventional amorphous alloy powder is used as a raw material of the stator iron core; and putting the amorphous alloy powder mixed with the adhesive in a die for pressure forming, wherein the amorphous alloy powder and the adhesive are mixed by a proportion of (100:5)-(100:20), the adhesive is prepared from insulating materials such as epoxy resin, and the like, the temperature for mixing the amorphous alloy powder and the adhesive is 120-180 DEG C, pressure in the pressure forming process is70-90MPA, and the pressure maintaining time in the pressure forming process is 5-10 minutes. The invention has the advantages of simple and convenient manufacture, good product consistency and stability and benefit to mass production. Eddy-current loss, no-load loss and magnetic hysteresis loss which are caused by the stator iron core are greatly reduced while working under a high frequency, thereby the purposes of energy saving and high efficiency are achieved.

The invention discloses a resin insulation dry type transformer with a three-dimensional roll iron core. The resin insulation dry type transformer comprises a transformer base, an upper clamping part, a lower clamping part and a three-dimensional roll iron core, wherein the upper clamping part and the lower clamping part are correspondingly arranged on the transformer base up and down, and the three-dimensional roll iron core is clamped between the upper clamping part and the lower clamping part; the three-dimensional roll iron core comprises three single frames, the middle parts of the single frames are hollowed out, and the single frames are of rounded rectangle structures in shape; the three single frames are arranged and spliced together in an equilateral triangle shape three-dimensionally; each single frame is formed by continuously winding a plurality of silicon steel trapezoid material straps in sequence; a coil is wound at the joint of every two single frames respectively; each coil is integrally poured by a curing agent and is formed through heating curing; and the exterior of each coil is encapsulated by epoxy resin respectively. The resin insulation dry type transformer is provided with the three-dimensional roll iron core, and has the characteristics of energy conservation and material saving, low no-load loss, low no-load current, low noise, good electrical performance, low partial discharge value, high lightning impulse resistance, high short-circuit resistance and high mechanical strength.

The invention discloses a capacity-adjusting transformer suitable for clear seasonal or periodical load changes. The capacity-adjusting transformer comprises a high-voltage winding and a low-voltage winding; the high-voltage winding and the low-voltage winding each comprise two to six series-parallel sections and a common section; when the transformer runs at the high-capacity tap position, the series-parallel sections of the high-voltage winding and the low-voltage winding are respectively connected in parallel to be connected with one parts of the corresponding common sections in series for running; when the transformer runs at the low-capacity tap position, the series-parallel sections of the high-voltage winding and the low-voltage winding are respectively connected in series to be connected with windings of the tapped positions of the corresponding common sections in series for running. According to the capacity-adjusting transformer, the difference between the rated capacity at the high-capacity tap position and the rated capacity at the low-capacity tap position of the transformer is large, and the capacity-adjusting transformer is more suitable for areas with large load differences; no-load loss reduction is large, so that when the capacity-adjusting transformer is applied to the areas with large load differences, the energy saving effect is more remarkable, and the unbalanced load bearing capacity of the transformer is improved; when loads are lower than the rated capacity at the low-capacity tap position, the transformer can run at the low-capacity tap position, and full-capacity running can be achieved at the low-capacity tap position of the transformer.

The invention relates to a power transformer based on the modular combination. A double-arc-shaped roll-core element of each phase of a three-phase three-dimensional roll-core comprises two straight line parts and two arc-shaped parts which are in end-to-end alternate connection, an open/closed yoke structure is arranged on each double-arc-shaped roll-core element and used for nesting a winding of the corresponding phase, and the six straight line parts of the three roll-core elements are bonded to one another respectively to form three iron columns of a three-phase three-column three-dimensional structure. An integrated low-voltage winding and a high-voltage foil winding are nested from inside to outside on each iron column, and each high-voltage foil winding consists of a group of high-voltage foil winding modules which are in series connection. The power transformer adopts the three-dimensional roll-core structure which has the novel double-arc shape and is formed by staggered open/closed yoke structures, and has the advantages of high overall stability, low noise, high operating safety, economic benefit and high reliability. Besides, the whole machine is diversified by the winding modules of fewer types, and the winding modules can be provided by different factories, are easy for on-site defect inspection and convenient for dismounting, replacing and recycling, and can meet the requirements for environmental protection and circular economy to the greatest extent.