72results about How to "Improve current utilization" patented technology

The invention discloses an electrochemical biological combined denitrification reactor, which comprises a tank body, an electrode plate, a particle electrode, an aerating apparatus and a constant current transformer. Both ends of the tank body are respectively provided with a water inlet and a water outlet. The electrode plate comprises an anode arranged on the center part of the tank body and a cathode which surrounds the anode to be arranged at the position close to the tank wall; the anode and the cathode are respectively connected with an anode and a cathode of the constant current transformer; the particle electrode is filled between the anode and the cathode; and the aerating apparatus comprises a fine bubble aerator arranged on the bottom of the tank body and an air pump connected with the fine bubble aerator. The device of the invention has compact and simple structure, small occupied area, high current utilization rate and rapid biofilm formation of microbe, can simultaneously remove various pollutants, such as organic matter, ammonia nitrogen and the like, has high denitrification efficiency and low energy consumption, is easy to regulate and control and is a multiple three-dimensional electrode biomembrane sewage treatment device integrating biology with an electric microfield into whole body.

The present invention discloses a taper magnetic bearing switched reluctance motor and a control method thereof. The motor is composed of a switched reluctance motor and two taper magnetic bearings; the bias windings of the two taper magnetic bearings are connected in series with the winding of the switched reluctance motor to a form m-phase torque winding; two vertical suspension windings of each taper magnetic bearing are configured to control the suspension with two degrees of freedom, have four vertical degrees of freedom and are able to perform decoupling control; the axial suspension windings of the two taper magnetic bearings are connected in series to form an axial suspension winding for controlling the axial suspension; the motor is able to independently control the opening and closing angles of a torque winding current and power circuit to control the rotating speed and the torque in real time; and the motor is able to control five suspension winding currents to regulate the suspension forces in five directions so as to realize the suspension with five degrees of freedom. The taper magnetic bearing switched reluctance motor and the control method thereof are small in control variables, simple in suspension control and low in cost of a suspension system power converter.

The invention provides a new process for micro electric field reinforced low-carbon nitrogen removal, which is particularly suitable for treating waste water with high ammonia nitrogen content and high organic substance content. The process comprises anaerobic fermentation reaction and autotrophic synchronous nitrification-denitrification reaction, wherein after the waste water to be treated enters an anaerobic fermentation reactor and is subjected to anaerobic fermentation reaction treatment, most of organic substances are converted into methane through anaerobic fermentation to perform energy recycle and avoid directly converting the organic substances into CO2 to be discharged. The waste water after the anaerobic treatment has few organic substances and then enters a complex three-dimensional electrode-biological membrane reactor. The process realizes autotrophic synchronous nitrification-denitrification by domesticating carbon autotrophic nitrifying bacteria and hydrogen autotrophic denitrifying bacteria attached to particle electrodes in the complex three-dimensional electrode-biological membrane reactor, finally fulfills the nitrogen removal purpose of directly converting the ammonia nitrogen into the nitrogen, does not need to add the organic substances, basically has no CO2 emission, and is a controllable, efficient, low-consumption, 'low-carbon emission' and environment-friendly new process.

The invention discloses a vector type permanent magnetic brushless motor control method. When a motor starts, by use of a constant-torque zone current closed-loop control method, a permanent magnetic brushless motor is controlled, when a PWM duty ratio output by an electric current loop proportional integral controller reaches a set threshold, by use of a constant-power weak-magnetic zone torque closed-loop control method, the permanent magnetic brushless motor is controlled; and in the constant-power weak-magnetic zone torque closed-loop control method, when a weak-magnetic control advanced conduction overlap angle delta theta FW output by a torque ring proportional integral controller is lower than a set threshold, by use of a constant-torque zone current closed-loop control method, the permanent magnetic brushless motor is controlled.

The invention provides a comparator and a relaxation oscillator. The comparator comprises a comparator circuit including a current mode comparator circuit; and the current mode comparator circuit consists of a first current mode comparator circuit and a second current mode comparator circuit, wherein the first current mode comparator circuit and the second current mode comparator circuit are connected with a first input terminal and a second input terminal of the comparator circuit electrically. The first current mode comparator circuit includes two N type MOS tubes and grids of the two N type MOS tubes are connected electrically; and the second current mode comparator circuit includes two P type MOS tubes and grids of the two P type MOS tubes are connected electrically. The oscillator includes the comparator. According to the invention, the production cost can be lowered; the development period can be shortened; the frequency stability is improved; and the ultra-low power consumption is realized.

The invention relates to a permanent magnet synchronous motor torque control method. The method comprises the following steps: (1) a MTPA (Maximum Torque Per Ampere) angle experiment is carried out, and a two-dimensional table for the torque in relative to the MTPA angle and target current is drawn; (2) the best MTPA angle is fit to a quartic curve in relative to the target current i<s>, and a quartic polynomial for the curve is obtained; (3) a bench experiment is carried out, and a two-dimensional table for the target current in relative to the current rotation speed and the target torque is drawn; (4) according to the above tables, the actually-needed target current is obtained through a proportional interpolation algorithm; and (5) according to the obtained target current, corresponding voltage is calculated, and the motor is controlled. by adopting the method of the invention, the current utilization rate of the motor is improved; the torque control accuracy is ensured in a full range; and the workload for preliminary data acquisition and later data processing optimization is reduced.

The invention provides a high-precision I/O (Input/Output) signal phase unbalance correcting circuit in a low-intermediate frequency wireless receiver. The high-precision I/O signal phase unbalance correcting circuit achieves the high image rejection requirement. According to the high-precision I/O signal phase unbalance correcting circuit, an I-path signal and a Q-path signal are coupled by a current summing circuit by adopting a matrix coupling circuit, and therefore phase unbalance correction is realized in the coupling process, wherein the coupling coefficient determines the magnitude of correction scope. According to the invention, an upper matrix coupling circuit is realized by adopting a method of intersecting two groups of geminate transistors, and the coupling coefficient is controlled by a variable current source and a fixed current source. The variable current source is realized by an 8-bit current-type DAC (Digital-to-Analog Converter). The high-precision I/O signal phase unbalance correcting circuit can be used for correcting the phase deviation precisely, wherein the correcting precision is up to 0.04 DEG, the correcting scope is +/-7DEG, and magnitude unbalance is not caused. The high-precision I/O signal phase unbalance correcting circuit is free from a high-precision ADC (Analog-to-Digital Converter) module and a high-performance DSP (Digital Signal Processor) chip, simple in implementation method, high in integration level and greatly-reduced in power consumption.

The invention discloses a conical magnetic suspension dual-passage switch reluctance machine and a control method. The machine comprises a switch reluctance machine and two conical magnetic bearings, wherein a bias winding of each conical magnetic bearing is connected in series with a passage winding of the switch reluctance machine to form a three-phase torque winding, two radial suspension windings of each conical magnetic bearing control suspension of two degrees of freedom, total four radial degrees of freedom exit, radial suspension forces can be in decoupling control, and a torque and axial suspension are further controlled by currents of two passage windings of the switch reluctance machine. By the switch reluctance machine and the control method, an axial suspension winding is not needed independently, suspension of five degrees of freedom can be achieved, the machine system is high in integration, a few in control variable and high in redundancy, and is simple to control.

The invention discloses a preparation method of a cup-shaped flexible wheel and a device thereof. A circular slab is tightened at the end of a core die by a tail top. A positive wire of a pulse powersupply is connected with the core die, and a negative wire is directly connected with each rotary wheel of a rotary wheel assembly. The circular slab is first spun and deformed into a cup-shaped workpiece with both inner and outer walls being straight walls by one rotary wheel. Then the cup-shaped workpiece is spun and deformed into two thickened cup-shaped workpieces with different straight wallthickness by another two rotary wheels, and a thicker smooth section is used as a tooth profile reserved section. Finally, the tooth profile reserved section is spun by one toothed rotary wheel to form a circle tooth profile around the outer circumference. At last, a small amount of cutting process is carried out to complete the processing process from the circular slab to the cup-shaped flexiblewheel workpiece. According to the cup - shaped flexible wheel manufacturing process based on plastic forming, streamline formed in the process of deformation can be completely retained, and the service life of parts is prolonged advantageously. The advantage of the method is more obvious for flexible wheels with an extremely small thickness.

The invention provides an LED chip with a DBR (distributed Bragg reflector) type current blocking layer and a production method of the LED chip. The production method includes the steps: firstly, providing a sapphire substrate, forming a luminous epitaxial layer on the upper surface of the sapphire substrate, etching a groove with a waved side wall and a flat bottom surface in a P-pad region of the luminous epitaxial layer, forming a dielectric DBR on the surface of the groove to serve as the current blocking layer, and enabling the current blocking layer to form a concave structure with a waved side wall and a flat bottom surface; secondly, forming a transparent conducting layer on the luminous epitaxial layer and the concave structure, and etching the transparent conducting layer to enable the concave structure and an N region to be exposed outside; and finally, producing a P-pad on the concave structure, and producing an N-pad on the N region so that the LED chip is produced. The problems that a current blocking layer and a highly reflective electrode are low in adhesion and easy to fall off, and an LED chip is light-absorbing of a P electrode, low in current utilization rate ant the like in the prior art can be solved.

The invention relates to a grid-control cold cathode X-ray tube which comprises a vacuum cavity, an anode assembly, a grid-control electrode and a cathode assembly. The anode assembly comprises an anode target, an anode metal hood and an anode connection pillar. The anode target, the anode metal hood and the cathode assembly are packaged in the vacuum cavity. The anode target is embedded in the anode metal hood and used for producing X rays. The normal line of a plane of the anode target is connected with an anode and a cathode to form an inclination angle which is (12+/-1) degrees. The cathode assembly comprises a cathode substrate and a cathode material which is arranged on the cathode substrate. The cathode hood serving as the grid-control electrode covers a cathode installation part which comprises a cathode lead and a grid lead. The cathode hood is made of metal. A hole is formed in the cathode hood and located in the connection line of the cathode substrate and the anode target. High voltage is led in through the anode connection pillar. The cathode hood serving as the grid-control electrode is connected with the grid lead. The cathode substrate is connected with the cathode lead. Voltage is exerted between two electrodes led out from the grid lead and the cathode lead.

The invention relates to a RF voltage-controlled oscillator. The RF voltage-controlled oscillator comprises an adaptive bias circuit, an oscillation circuit and an LC resonant circuit; the oscillation circuit is connected with the adaptive bias circuit and the LC resonant circuit; the adaptive bias circuit outputs a bias voltage to the oscillation circuit; the oscillation circuit starts up the LC resonant circuit in a B type state to enable the LC resonant circuit to start oscillation based on the bias voltage, and the oscillation amplitude is increased gradually; and the oscillation circuit enters a C type state when the amplitude value of the bias voltage is smaller than a first threshold value, and increase of the oscillation amplitude is stopped when the amplitude value of the bias voltage is smaller than a second threshold value. As the adaptive bias circuit outputs the bias voltage to enable the oscillation circuit to start up the LC resonant circuit in the B type state, then the LC resonant circuit starts oscillation, and then the resonant circuit enters the C type state for oscillation along with the increase of the oscillation amplitude, the oscillation is easily started and high current utilization rate is obtained. As a compensatory resistor is added between the output ends of a first transistor and a second transistor and the ground, negative feedback stability is kept, and the stability within a wide working range is guaranteed.

The invention discloses a hybrid radial conical magnetic bearing switch reluctance machine and a control method. The machine comprises a switch reluctance machine, two radial magnetic bearings and two conical magnetic bearings, wherein one of the radial magnetic bearings and one of the conical magnetic bearings are arranged at one side of the switch reluctance machine, the other two bearings are arranged at the other side of the switch reluctance machine, bias windings of four magnetic bearings are connected in series with a winding of the switch reluctance machine to form an m-phase torque winding, torque control is the same as a traditional control mode of the switch reluctance machine, five directional suspension forces are only related to a current of the m-phase torque winding and a current of each directional suspension winding, the suspension forces are decoupled to one another, and the torque and the suspension forces can be in decoupling control. The machine and the control machine are high in integration, a few in control variable and simple in suspension control, and a suspension system power converter is low in cost.

The invention discloses a four-degree-of-freedom composite structure bearingless switch reluctance machine and a controlling method thereof. The motor is composed of a switch reluctance machine and two radial magnetic bearings. Each magnetic bearing stator is formed by four E-type structures; one suspension winding and one armature winding wind around a middle tooth of each E-type structure; and one bias winding and one armature winding wind around two tooth windings. One armature winding winds around each tooth of the switch reluctance machine and crosses over the two magnetic bearing stators and a switch reluctance machine stator. An A-phase armature winding forms one phase; and B-phase and C-phase armature windings and bias windings are connected in series to form another two phases. A torque controlling way is identical with a traditional switch reluctance machine controlling way. The suspension force at a certain direction of each magnetic bearing is only related with a three-phase armature winding current and a suspension current at the direction; and the torque and the suspension force as well as the torque and the radial suspension force is in decoupling controlling. The suspension controlling becomes simple; and the outputs of the suspension forces are balanced and symmetric.

A rare-earth alloy permanent magnet material preparation device comprises a raw material treatment portion, a precipitation tank, an electrolytic furnace, a grinding mechanism, a stamping mechanism and a vacuum sintering furnace. The raw material treatment portion comprises a rare-earth metal treatment tank and a blending tank, a delivery pipe connected with the blending tank is arranged on the rear-earth metal treatment tank, the blending tank is connected with the precipitation tank through a complexing solution delivery pipe, the precipitation tank is connected with the electrolytic furnace, a feed inlet is arranged on one side of the electrolytic furnace, a casting chamber is arranged at the tail end of the electrolytic furnace and connected with a cooling chamber, the cooling chamber is connected with the grinding mechanism through a discharge pipe, and the grinding mechanism is connected with the stamping mechanism which is connected with the vacuum sintering furnace. The problem of segregation of alloy ingots is solved effectively, high temperature strength, structural stability, welding performance and corrosion resistance of the alloy ingots are improved beneficially due to addition of Sc, and the common electrolytic furnace can be used for smelting the alloy ingots by adopting mixture after Nd, Pr, Dy and Sc complexing.

The invention relates to an electrolysis method and belongs to the field of metal powder preparation. On the basis of a conventional electrolysis method, one electrode is changed into a cylinder shape to be used as an electrolyser; another electrode is arranged inside the cylindrical electrode; electrolyte continuously enters in the electrolyser in the axis direction of the cylindrical electrode; and the enter pressure of the electrolyte is 0.0006 to 5MPa. In the continuous electrolysis process, metal powder electrolyzed out on a cathode plate is flushed by the circulating electrolyte; after the electrolysis is completed, the electrolyte is stood; and finally, the electrolytic metal powder is obtained. The electrolytic metal powder obtained by the method has high efficiency and high current utilization rate and various fine electrolytic powder can be obtained.

The invention discloses a mixed magnetic bearing dual-winding switch reluctance motor and a control method. The motor consists of a switch reluctance motor and two radial magnetic bearings; a magnetic bearing stator is formed by four E-shaped structures, and the middle tooth of each E-shaped structure is wound with a suspension winding; each tooth of the switch reluctance motor is wound with a bias winding and a reluctance motor winding separately; the bias winding transversely crosses two magnetic bearing stators and a switch reluctance motor stator while the reluctance motor winding only winds the reluctance motor stator; two windings are connected in series to form a torque winding string, and a three-phase torque winding can be formed; the torque control is the same as the control way of the conventional switch reluctance motor; the suspension force in two directions of each magnetic bearing is only related to the three-phase torque winding current and two suspension currents, and decoupling control of the torque and the suspension force can be realized; the motor and the control method disclosed by the invention are high in integration degree, less in control variables and simple in suspension control, and the suspension power converter is low in cost; and design of decoupling control of the torque and the suspension force can be realized.

The invention provides a converter of a fan, and a junction temperature monitoring method and device of an IGBT module. The junction temperature monitoring method of the IGBT module comprises the steps: a forward peak current of the IGBT module, the power factor of the IGBT module, the modulation ratio of the IGBT module, the switching frequency of the IGBT module, and an estimated value of the current junction temperature of the IGBT module are obtained; the conduction loss of the IGBT module and the switching loss of the IGBT module are calculated according to the forward peak current of theIGBT module, the power factor of the IGBT module, the modulation ratio of the IGBT module, the switching frequency of the IGBT module, and the estimated value of the current junction temperature of the IGBT module; and the junction temperature of the IGBT module is calculated according to the conduction loss of the IGBT module, the switching loss of the IGBT module and the shell temperature of the IGBT module. By adopting the technical scheme, the accuracy degree of a junction temperature monitoring result can be increased.

The present invention discloses a taper magnetic bearing switch reluctance motor and a control method thereof. The motor is formed by one switch reluctance motor and two taper magnetic bearings; a taper stator is formed by 4 E-shaped structures, the central tooth of each E-shaped structure is winded with a vertical suspension winding, is winded at, each of other two teeth are respectively winded with an axial direction suspension winding, the vertical suspension windings and the axial direction suspension windings are connected in series to form a set of the axial direction suspension winding; an armature winding crosses the two taper stators and a reluctance motor stator to form 3-phase armature winding; rotation control is the same as a traditional switch reluctance motor control mode, and bias flux is generated for suspension; and five suspension forces are associated with the 3-phase armature winding current, current of 4 vertical suspension windings and current of 2 vertical suspension windings; the two vertical suspension windings can optimize the bias flux to allow the generated bias flux to be equal when the 3-phase armature winding performs individual excitation so as to solve the problem that the vertical suspension force output is unbalance. The motor system is high in integration degree and high in current utilization rate and realizes decoupling between the torque and the suspension force.

The invention belongs to the technical field of communication, and relates to a current multiplexing voltage-controlled oscillator, in particular to a current multiplexing voltage-controlled oscillator based on grid-source transformer feedback, which is used for solving the problems of poor phase noise of a traditional voltage-controlled oscillator in a high frequency band, large occupied area, high power consumption and the like of a traditional self-mixing oscillator chip. The frequency mixer comprises a voltage-controlled oscillator fed back by a gate-source transformer, a frequency mixer body and a blocking capacitor. According to the voltage-controlled oscillator fed back by the gate-source transformer, the requirement for the power supply voltage is reduced, a high-performance working state can still be kept at a low voltage, and power consumption is reduced; and moreover, the even harmonic current of the voltage-controlled oscillator fed back by the gate-source transformer and the single balanced mixer are subjected to current multiplexing, so that the loss is reduced, the utilization rate of the current is improved, and the occupied area of a chip is remarkably reduced.