47 results about "Maximum flux" patented technology

The invention provides a control method of a flyback converter. The control method is a control method in a mixed control mode; in other words, the flyback converter works in a non-complementation state under light loads, the clamp switch pipe on time is shortened through down conversion, and light load losses are effectively reduced through down conversion; flyback converter works in a fixed-frequency drive complementation state under heavy loads, and the clamp switch pipe on time is prolonged. Compared with the prior art, the control method has the advantages that the voltage stress of a main switch pipe and a clamp capacitor can be effectively reduced, the main switch pipe off losses can be reduced, the clamp circuit current change slope is decreased, the EMI interference is reduced, the secondary current change slope is decreased, and the longer detection reaction time is provided for synchronous rectification. Meanwhile, the working area of a magnetic core in the third quadrant is enlarged, the maximum flux density is reduced, and the size of the magnetic core is reduced.

An improvement over conventional electromagnetic flowmeters which signal a measure of flow rate by controlling the current in a current signalling loop (also known as a sensing loop) and in which power for the flowmeter is derived from the current in the signalling/sensing loop. Conventional electromagnetic flowmeters use a standard current range (typically 4-20 mA), in which zero flow is indicated by controlling the current in the loop to a minimum predeterimened value and maximum flow is indicated by controlling the current to a maximum predetermined value. In the improved flowmeter of the invention, minimum flow is signalled by maximum current in the signalling/sensing loop and maximum flow is signalled by minimum current. This has been found to enable improved accuracy to be obtained at low flow rates without requiring complex flowmeter circuitry.

The invention belongs to the field of transformer manufacturing and relates to an amorphous iron core, a manufacturing method thereof and a transformer with high performance, low noise and low cost. The amorphous iron core for the transformer has iron loss of less than or equal to 0.20 W/kg and excitation power of less than or equal to 0.80 VA/kg under the conditions of frequency of 50Hz and maximum flux density of 1.35T. The width of the iron core for the transformer is made of an iron-based amorphous alloy broad band with the width between 220 and 500 mm, the no-load loss of the transformer is less than or equal to 0.25 W/kg under the conditions of frequency of 50Hz and maximum flux density of 1.35T, and the noise of the transformer is reduced by 5 to 10 decibels and the copper using amount of the transformer is reduced by more than 1 percent approximately compared with those of the conventional transformer with two layers of overlaid iron cores. By the manufacturing method, a process flow of the iron core for the transformer is simplified, a complicated process for fixing the iron cores respectively under the condition of the two layers of overlaid iron cores is avoided, property deterioration caused by assembly stress of the iron cores is reduced, the noise is lowed, the total height of the iron cores is reduced, and the material cost is saved; and the operating efficiency is improved, so that the structure of the amorphous transformer is more compact and the manufacturing mode of the conventional large-capacity amorphous transformer iron cores is completely changed.

A signal processor receives signaling containing information about flow rates from sensorless converters in zone circulators in heating/cooling zones controlled by temperature sensors in a hydronic heating system in order to derive an adaptive pressure set point to meet the flow rates requested by the heating/cooling zones using an adaptive system and flow control curve equation, the signaling containing information about total flow rates requested by the zone circulators; determines desired pump speeds for the zone circulators to meet temperature requirements in heat zones; provides corresponding signaling containing information about the desired pump speeds; and/or determines the adaptive pump control curve equation based upon an adaptive system curve and as a moving maximum system flow rate depending on an adaptive pressure set point, a system flow rate requested by temperature loads, a minimum pressure at no flow, a control curve setting parameter, and an adaptive moving maximum flow and pressure.

An electromagnetic lock monitoring system for monitoring the strength of a magnetic field in an electromechanical lock which is created when a steel armature plate is closed against an electromagnet. The system utilizes dual Hall Effect devices positioned in such a way that both ends of the electromagnet and both magnetic fields are monitored, and that the resulting monitoring effectively covers the complete contact surface between the electromagnet and the armature plate. Preferably, the Hall Effect devices are disposed in series at the point of maximum flux density within the center element of an E-shaped electromagnetic core, at opposite ends of the core. If the magnetic flux is below a preset limit, a relay also in series drops out, triggering an alarm which may be sonic, electronic, and/or visual, as is known in the prior art.

The invention provides an estimation of key flow-independent parameters characteristic of NO exchange in the lungs, namely: 1) the steady state alveolar concentration, C_alv,ss; 2) the maximum flux of NO from the airways, J_NO,max; and 3) the diffusing capacity of NO in the airways, D_NO,air. The parameters were estimated from a single exhalation maneuver comprised of a pre-expiratory breathhold, followed by an exhalation in which the flow rate progressively decreased. The mean values for J_NO,max, D_NO,air, and C_alv,ss do not depend on breathhold time for breathhold times greater than approximately 10 seconds. A priori estimates of the parameter confidence intervals demonstrates that a breathhold no longer than 20 seconds may be adequate, and that J_NO,max be can estimated with the smallest uncertainty, and D_NO,air the largest.

The invention discloses a hierarchical porous nickel-aluminum alloy membrane with the electrocatalytic performance and a preparation method thereof. According to the method, a certain proportion of nickel-aluminum powder is taken, is mixed and pressed, and then is molten into a porous alloy membrane in a sintering mode, then the interior of the porous alloy membrane is enabled to form a microporous morphology through chemical corrosion, the alloy membrane forms a nano-pore structure with high specific surface area and high catalytic activity due to the fact that nickel-aluminum alloy is corroded by sodium hydroxide, so that the membrane separation and the electrocatalysis function are integrated without adding an additional supported catalyst, and therefore the processing capacity of the alloy membrane to dye wastewater is greatly improved, and the decolorization rate of the alloy membrane at the maximum flux is increased from 55% to 95% or above.

A relative flux sensor (122) and a method of characterizing characteristics of light emitters are provided. The relative flux sensor (122) comprises a color point sensor (108) and a sensor color (118). The color point sensor (108) measures a color point in a color space of light emitted by a light source (101) comprising a first light emitter (102) for emitting light of a first color and a second light emitter (114) for emitting light of a second color being different from the first color. The light source (101) is arranged for emitting light of a controllable color, being a mix of light of the first color and light of the second color. The sensor controller (118) is coupled to the color point sensor (108) for receiving a measuring signal and is arranged for i) providing a first signal to the light source (101), the first signal comprising a dimming factor D1 and a dimming factor D2, the dimming factor D1 and the dimming factor D2 indicating a fraction of a maximum flux of the first light emitter (102) and the second light emitter (114), respectively, and receiving the measuring signal representing a first color point when the light source (101) emits light according to the first signal, wherein at least one of the dimming factors D1 and D2 is different from 0, ii) providing a second signal to the light source (101), the second signal comprising a dimming factor D4 and a dimming factor D5, the dimming factor D4 and the dimming factor D indicating a fraction of the maximum flux of the first light emitter (102) and the second light emitter (114), respectively, and receiving the measuring signal representing a second color point when the light source (101) emits light according to the second signal, wherein both dimming factors D4 and D5 are different from 0, iii) calculating within a model of the color 20 space a ratio between a maximum flux of the first light emitter (102) and a maximum flux of the second light emitter (114) on the basis of the first color point, the second color point, the dimming factors D1, D2, D4 and D5.

A rotor (17, 31, 71, 91, 101, 121, 131, 141, 201, 401) of a motor (13, 51) is provided with a rotation shaft (21, 59, 410) and a plurality of magnets (15, 53, 75, 105, 210A, 210B, 411) on a circular periphery. Plates (25, 25A, 25B, 25C, 63, 77, 220, 300, 430) made of magnetic materials are provided so that each of which is magnetized by leakage flux of a corresponding magnet (15, 53, 75, 105, 210A, 210B, 401). The plates (25, 25A, 25B, 25C, 33, 63, 77, 107, 220, 300, 430) are disposed along a circular path such that a maximum flux density is formed at both peripheral ends. A magnetic sensor (27) outputs a signal in response to the variation of a flux density on the circular path.

It is an object of the present invention to provide a method of estimating the maximum value of the flux during long-term stable operation including cleaning of a membrane filtration plant based on measured data of a membrane filtration characteristic during initial membrane filtration. The present invention provides a method in which the maximum flux during stable operation of a new membrane filtration plant for which a membrane module and operating conditions have been specified is estimated from a measured value A of an initial membrane filtration characteristic measured using a liquid to be treated in and a membrane of a membrane module of the new membrane filtration plant, an empirical value of a maximum flux during stable operation of each of a plurality of existing membrane filtration plants having the same or a similar membrane module and operating conditions, and a measured value B of the initial membrane filtration characteristic measured using a liquid to be treated in and a membrane of a membrane module of each of the existing membrane filtration plants.

The invention discloses a rapid optimization method for a power battery air cooling system runner interval. The method comprises the steps that beginning from the uniform runner interval, velocity distribution of an air cooling system is solved through numerical values, by analyzing the flow distribution between cooling runners, the runner with the minimum flow and the runner with the maximum floware determined, then, the interval of the runner with the minimum flow is increased, and the interval of the runner with the maximum flow is decreased; speed distribution of the system is calculatedagain every time the runner interval is adjusted, and therefore the next runner interval adjustment is performed; when the frequency for runner interval adjustment reaches the set frequency, the layout of the runner interval with the minimum cooling runner equivalent flow standard deviation in the process is adjusted, and the final runner interval optimization result is obtained. The rapid optimization method has the advantages of being simple in optimization process, high in optimization speed, good in performance index, good in expansibility, high in practicability and the like.

The invention provides a reed pipe pulse type fluid flow meter metering method. A controller MCU (Micro-programmed Control Unit) is used for setting 1/2 of pulse interval time corresponding to a rated maximum flow of a fluid flow meter to a minimum phase time threshold value Tmin, and setting 1/2 of pulse interval time corresponding to a rated minimum flow of the fluid flow meter to a maximum phase time threshold value Tmax; meanwhile, a main counter, an auxiliary counter and a general counter are arranged; each of the main counter and the auxiliary counter corresponds to two reed pipes; whether the main counter and the auxiliary counter are effective or not is judged and counting is performed according to the comparison of the pulse interval time, the Tmin and the Tmax. The reed pipe pulse type fluid flow meter metering method provided by the invention has the beneficial effects that shake pulses can be effectively removed, and excessive metering of the flow is avoided; meanwhile, the condition that the pulse is not triggered caused by the fact that the rotary speed of a word wheel at the end is too fast can be made up and the missed counting of the flow is avoided, so that the fluid metering accuracy of the flow meter is effectively improved.

A system for preventing magnetic saturation in a transformer cores. A magnetic flux sensor is disposed within a bore in the core in a bore drilled or let into the material of a toroidal transformer core. The sensor transmits a sensor output that is continuously received by a microprocessor that is programed to process the sensor output and to also continuously compare in real time the sensor output with a stored selectable maximum flux sensor output value. Responsive to the comparison of real-time sensor output value to the stored maximum value, the microprocessor either allows, during each driving voltage half-cycle, the driving voltage to continue unabated while the sensor output remains below the selectable maximum value, or triggers a gate to modify the driving voltage for the remainder of the half-cycle when the selectable maximum value is reached.

The invention relates to a four-phase block rotor pole electro-magnetic doubly salient motor. The stator core is provided with 12 uniformly distributed salient stator poles which are identical in rootpole width. The tops of the 12 salient stator poles are widened outward to form a pole arc structure. The angle of the pole arc structure width is 22 degrees. The rotor core is provided with 9 sectorblock rotor poles. The angle of the sector top width is 32 degrees, and the angle of the bottom width is 17 degrees. A set of armature windings and a set of excitation windings are wound around the stator poles. The distributed excitation mode is used, the excitation windings are uniformly distributed on each stator pole and the generated magnetic circuit is symmetrical so that the problems of asymmetrical four-phase flux linkage, unbalanced electromagnetic force and large torque ripple in the centralized excitation mode can be solved. The rotor block structure is used and the maximum flux value is greater than that of the conventional structure doubly salient motor. The motor is externally connected with four-phase bridge current to form a DC generator so as to have the characteristics of high reliability, convenient voltage regulation and long-term operation.

A method of operating a synchronous motor having a stator that includes a set of electromagnets and a permanent magnet rotor. The synchronous motor is controlled by calculating in a flux controller a measure of a flux magnitude, which is the magnitude of the stator flux of the motor and by calculating in a load angle controller a measure of a load angle. Information about a desired motor torque or a reduced motor torque, which is smaller than the desired motor torque, is input to the load angle controller and the load angle controller calculates the measure of the load angle depending on the input motor torque. The measure of the flux magnitude is combined with the measure of the load angle to obtain commands for controlling electric currents of electromagnets of the stator, thereby directly controlling the stator flux. A flux limit value, which depends on a predetermined maximum value of the stator flux allowed for the motor which depends on a maximum value of an electric voltage, which is used to drive the currents through the stator electromagnets and which depends on the actual rotor speed, is repeatedly calculated. During acceleration of the rotor while the stator flux is smaller than the maximum flux allowed for the motor the measure of the flux magnitude is calculated depending on the output of a predetermined function. The output of the predetermined function depends on the desired motor torque and corresponds to the magnitude of the stator flux.

The invention discloses a motor valve which is mainly used for opening or closing control of various intelligent gas meters. The motor valve comprises a valve body, a valve cover and an execution component; the valve body is provided with an air inlet and an air outlet; the valve cover is arranged at the air outlet side; the execution component is connected with the valve cover; the motor valve is characterized in that: the valve body is an unfilled-corner rectangular valve body; the air outlet of the valve body is an oblique air outlet; the valve cover adopts a turnover typed valve cover; when the valve cover of the motor valve is opened, the airflow linearly passes through the valve body; therefore, the minimum pressure loss and maximum flux can be obtained, the motor valve overcomes the defects of large air pressure loss and unreliable switching action existing in the prior art and has the advantages of reasonable structure, reliable switching, large flux, low pressure loss, and the like.

The present invention relates to a dust collector (1) which comprises a frame provided with an electric motor (20) connected with a fan. When the dust collector is running, at the upstream of the electric motor (20), air suction can be generated from one pipeline to a suction nozzle and to the air outlet of the frame at the downstream of the electric motor (20). A filter device is arranged on the pneumatic power path and is preferably arranged on the upstream of the motor (20). Regulating devices (200, 400) for regulating the air flux in the dust collector (1) are arranged on the pneumatic power path at the upstream of the motor (20). When the motor (20) is operating, the regulating devices (200, 400) can cause the change to the air flow area passing through under the condition that the flux is changed. The dust collector is characterized in that the change of the air flow area can be realized in a range from 80% to 100% of the predetermined maximum flux.