75results about How to "Current controllable" patented technology

The invention discloses a method for optimizing a preparation process of a vanadium-aluminum alloy, which comprises the following steps of: at first, crushing vanadium pentoxide, aluminum powder, lime, fluorite and other materials according to the requirement of charging grain size, baking the crushed materials, dehydrating, removing volatile substances, then proportioning the baked materials appropriately, afterwards, totally pouring the proportioned materials into a material mixing cylinder for material mixing, delivering the sufficiently and uniformly mixed materials into a reaction furnace for smelting, standing still and precipitating upon the end of the smelting, then implementing casting, and finally, carrying out ball blast finishing, sampling and quality inspection. The method disclosed by the invention can effectively raise the metal recovery rate, lower the cost, reduce the content of alloy impurities and improve the quality of alloy.

The invention provides a charge pump circuit and a memory. The charge pump circuit comprises a charge pump unit, a clock oscillator, a first partial voltage unit and a voltage comparer and further comprises a second partial voltage unit. The output end of the charge pump unit is connected with the output end of the charge pump circuit. The clock oscillator is suitable for providing a drive clock signal for the charge pump unit. The first input end of the first partial voltage unit is connected with the output end of the charge pump unit, the second input end of the first partial voltage unit is grounded, and the first partial voltage unit is suitable for outputting a first partial voltage. A reference voltage and the first partial voltage are input into the first input end and the second input end of the voltage comparer respectively, the voltage comparer is suitable for outputting a first comparison result which is used for controlling the clock oscillator to output the drive clock signal. The first input end of the second partial voltage unit is connected with a power source, the second input end of the second partial voltage unit is grounded, and the second partial voltage unit is suitable for dividing a power voltage so that the reference voltage can be output. The charge pump circuit has a low quiescent current, and the standby power consumption of the memory can be reduced.

The invention relates to a titanium alloy, in particular to a titanium alloy and a preparation method thereof. The titanium alloy comprises the following components in percentage by weight: balanced of Ti, 5.3-6.10 percent of Al, 1.80-2.20 percent of Sn, 1.80-2.20 percent of Zr, 1.80-2.20 percent of Mo, 1.80-2.20 percent of Cr, 0.13-0.19 percent of Si, lower than 0.08 percent of Fe, lower than 0.08 percent of C, not more than 0.03 percent of N, not more than 0.015 percent of H and not more than 0.12 percent of O; the smelting technical parameters are as follows: the vacuum degree before smelting is lower than 3Pa, the leakage rate within 3 min is equal to or lower than 3Pa, the smelting vacuum degree is equal to or lower than 3Pa, and the smelting current and the feeding current range from 2kA to 10kA; and the preparation method comprises the following steps: firstly, preparing the intermediate alloys AlSn50, AlCr50 and AlMo60, and then performing electrode preparation, electrode baking, electrode welding, furnace loading, smelting, cooling, furnace tapping, turning and sampling analysis by budgeting. The invention has the advantages that the refined grains of the alloy for silicon are added in, the processing and the forging are easy, the tensile strength in the performances of a plate processed by the alloy reaches 1100-1300MPa, the elongation rate reaches 12-20 percent, and meanwhile, the Beta phase can be stabilized.

The invention relates to the preparation of titanium alloy, more specifically an Al-Nb-Ta intermediate alloy for titanium alloy preparation and process for preparing the same, wherein the constituents (by weight percent) of the alloy include, Al 19-28%, Ta 23-27%, and balancing Nb. The preparing process comprises, employing furnace outside ignition smelting method, operating according to routine procedures, the raw material drying temperature being 70-80 deg. C, the drying time no less than 24 hours, calculated based on 1kg of Nb2O5, the charged mixture includes, Ta2O5 0.383-0.42kg, Al 0.75-0.913kg, CaF2 0.15-0.20kg, KCLO3 0.30-0.40kg, the raw material shoving temperature being 30-60 deg. C. The advantages of the invention include facilitated preparation of titanium alloy, low making cost, homogeneous alloying, good oxidation resistance, easy storing, transport and fragmenting.

The invention discloses a double-coil radial and spherical pure-electromagnetic bearing. The double-coil radial and spherical pure-electromagnetic bearing mainly comprises four stator cores arranged in the +/- X direction and the +/- Y direction, a first coil, a second coil, a sleeve, an air gap and a rotor. By adopting the spherical magnetic bearing structure, the electromagnetic force exerted on a rotation shaft always passes through the sphere center, when the sphere center of the rotation shaft coincides with the mass center, the torque generated by the electromagnetic force relative to the rotation shaft is zero, and therefore interference of radial twisting to axial translation is removed. In addition, by adopting the specific pole shoe structure in the stator cores, magnetic field distribution is more uniform in the peripheral direction; the double-coil structure is adopted in field coils of the stator cores, the turns of the two coils are different, the current of the coil smaller in turn is controllable, the current of the coil higher in turn is unchangeable, and the current response rate is increased compared with the single-coil structure; the differential mode is adopted in the controllable current, so that the control accuracy of the magnetic bearing is further improved.

The invention relates to the preparation of titanium alloy, more specifically an Al-Ti-Nb intermediate alloy for titanium alloy preparation and process for preparing the same, wherein the constituents (by weight percent) of the alloy include, Al 2-10%, Si 3-30%, and balancing Nb. The preparing process comprises, employing furnace outside ignition smelting method, operating according to routine procedures, the raw material drying temperature being 70-80 deg. C, the drying time no less than 24 hours, calculated based on 1kg of Nb2O5, the charged mixture includes, TiO2 0.25-0.66kg, Al 0.115-0.46kg, CaF2 0.05-0.10kg, KclO3 0.07-0.12 kg, the raw material shoving temperature being 30-60 deg. C. The advantages of the invention include facilitated preparation of titanium alloy, low making cost, homogeneous alloying, good oxidation resistance, easy storing, transport and fragmenting.

A polarizing device includes: a polarizing iron core (13) facing to a specified number of permanent magnets (11) among plural unmagnetized permanent magnets (11) arranged at specified intervals circumferentially on a rotor (12); a first coil (15) wound at a position facing to a desired permanent magnet (11a) of the polarizing iron core (13); a pair of second coils (16) each arranged having a specified interval according to the first coil (15) circumferentially on the polarizing iron core (13) and whose direction of the flowing current is different from that of the first coil (15); and a power source (22) for supplying the current to the first and second coils (15, 16), and either of the permanent magnet (11a) and first coil (15) is relatively moved and each permanent magnet (11) is magnetized to form a magnetic pole in turn by the current fed from the power source (22).

The invention relates to the technical field of motor demagnetization and provides a motor demagnetization method and apparatus. The motor demagnetization method comprises the following steps of: demagnetizing a motor when the motor is shut down; in a motor demagnetization process, detecting feedback current on a DC bus of the motor and determining whether the value of the feedback current is greater than a first preset current value; when the value of the feedback current is less than the first preset current value, continuing demagnetizing the motor until the demagnetization of the motor finishes; when the value of the feedback current is greater than the first preset current value, switching off the switch tubes of the upper bridge arm and the lower bridge arm of a frequency converter within preset time, and executing the above steps cyclically until the demagnetization of the motor finishes. The method and the apparatus achieve controllable motor demagnetization time and current and may manually set demagnetization time as required. The demagnetized motor fast enters a rotating speed tracking state and thus, not only is rotating speed tracking waiting time shorten, but also the reliability of rotating speed tracking is improved.

The invention relates to the preparation of titanium alloy, more specifically an Al-Nb intermediate alloy for titanium alloy preparation and process for preparing the same, wherein the constituents (by weight percent) of the alloy include, Al 15-55%, and balancing Nb. The preparing process comprises, employing furnace outside ignition smelting method, operating according to routine procedures, the raw material drying temperature being 70-80 deg. C, the drying time no less than 24 hours, calculated based on 1kg of Nb2O5, the charged mixture includes, Al 0.423-1.07kg, CaF2 0.07-0.16kg, KCLO3 0.065-0.28kg, the raw material shoving temperature being 30-60 deg. C. The advantages of the invention include facilitated preparation of titanium alloy, low making cost, homogeneous alloying, good oxidation resistance, easy storing, transport and fragmenting.

The invention relates to the preparation of titanium alloy, more specifically an Al-Mo-V-Fe intermediate alloy for titanium alloy preparation and process for preparing the same, wherein the constituents (by weight percent) of the alloy include, Al 5.5-17.2%, V 35-39%, Fe 3.8-5.5%, and balancing Mo. The preparing process comprises, employing furnace outside ignition smelting method, operating according to routine procedures, the raw material drying temperature being 70-80 deg. C, the drying time no less than 24 hours, calculated based on 1kg of MoO3, the charged mixture includes, V2O3 0.879-0.979kg, Fe 0.047-0.069%, Al 0.69-1.457kg, CaF2 0.05-0.4kg, KCLO3 0.14-0.20%, the raw material shoving temperature being 30-60 deg. C. The advantages of the invention include facilitated preparation of titanium alloy, low making cost, homogeneous alloying, good oxidation resistance, easy storing, transport and fragmenting.

The invention relates to the preparation of titanium alloy, more specifically an V-Al-Sn-Cr intermediate alloy for titanium alloy preparation and process for preparing the same, wherein the constituents (by weight percent) of the alloy include, Al 5.5-13.5%, Sn 11-14%, Cr 11-14%, and balancing V. The preparing process comprises, employing furnace outside ignition smelting method, operating according to routine procedures, calculated based on 1kg of V2O5, the charged mixture includes, Al 0.51-0.758kg, SnO2 0.136-0.148 kg, CrO3 0.23-0.275kg, CaF2 0.2-0.3kg, furnace slag 0.25-0.35kg (produced during vanadium-chrome-aluminum alloy smelting), the raw material shoving temperature being 30-60 deg. C. The advantages of the invention include facilitated preparation of titanium alloy, low making cost, homogeneous alloying, good oxidation resistance, easy storing, transport and fragmenting.

The invention relates to the preparation of titanium alloy, more specifically an Al-Mo-Cr-Fe-Si intermediate alloy for titanium alloy preparation and process for preparing the same, wherein the constituents (by weight percent) of the alloy include, Al 11.4-35%, Cr 20-28%, Fe 6-10%, Si 4.0-5.6%, and balancing Mo. The preparing process comprises, employing furnace outside ignition smelting method, operating according to routine procedures, the raw material drying temperature being 70-80 deg. C, the drying time no less than 24 hours, calculated based on 1kg of MoO3, the charged mixture includes, CrO3 0.71-0.99kg, Fe 0.20-0.33kg, Si 0.046-0.065kg, Al 0.663-1.92kg, CaF2 0.05-0.4kg, the raw material shoving temperature being 30-60 deg. C.

The invention relates to the preparation of titanium alloy, more specifically an V-Al-Cr-Mo intermediate alloy for titanium alloy preparation and process for preparing the same, wherein the constituents (by weight percent) of the alloy include, Al 10%, Mo 22%, Cr 30%, and balancing V. The preparing process comprises, employing furnace outside ignition smelting method, operating according to routine procedures, calculated based on 1kg of V2O5, the charged mixture includes, CrO3 0.808-1.64kg, MoO3 0.136-0.42kg, Al 0.958-2.87kg, CaF2 0.03-0.08kg, furnace slag 0-0.20kg (produced during vanadium-chrome-aluminum alloy smelting), the raw material shoving temperature being 30-60 deg. C. The advantages of the invention include facilitated preparation of titanium alloy, low making cost, homogeneous alloying, good oxidation resistance, easy storing, transport and fragmenting.

The invention discloses a high speed rotating shafting dynamic radial loading stiffness test method and device. The method comprises the steps that driving current is outputted to electromagnetic windings; the driving current and the radial displacement outputted by a displacement sensor are recorded; the radial displacement of the rotating spindle and the radial magnetic attraction force appliedto the rotating spindle are determined; and the specific value of the radial magnetic attraction force applied to the rotating spindle to the radial displacement of the rotating spindle is calculatedas the first dynamic stiffness and/or the specific value of the Fourier transform results of the radial magnetic attraction force and the radial displacement is calculated as the second dynamic stiffness. The device comprises a stator fixing base and a rotor clamp. An accommodating hole, the displacement sensor and two electromagnetic windings symmetrically arranged relative to the rotor clamp arearranged on the stator fixing base. The rotor clamp is arranged in the accommodating hole. The external wall of the rotor clamp is provided with a silicon steel rotor which is arranged between the two electromagnetic windings. The method and the device have the advantages of being high in measurement accuracy, high in applicability, convenient to measure and low in energy consumption and can realize stable linear loading.

The invention relates to a mixed type LED circuit. The mixed type LED circuit is characterized in that the power supply side of a controllable LED circuit is connected with a voltage-dividing LED in series, currents flowing through the voltage-dividing LED are regulated by controlling output power of an controllable LED, and therefore output power of the whole illumination circuit is controlled; the voltage-dividing LED can be an alternating-current LED and can also be a direct-current LED, and the controllable LED can be a direct-current LED and a drive of the direct-current LED and can also be an alternating-current LED and a drive of the alternating-current LED; as part of LEDs in the mixed type LED illumination circuit do not need driving circuits, higher efficiency is achieved, voltage resistance and power of the controllable LED circuit are low after voltage dividing conducted by the voltage-dividing LED connected in series, cost is lower, and the mixed type LED circuit is suitable for an illuminating system using high-voltage power supply like commercial power supply.

The invention discloses an equilibrium charging method of batteries, and belongs to the field of equilibrium charging. The equilibrium charging method comprises a main circuit, a plurality of single lithium batteries, a plurality of single lithium battery protection chips, a charge control MOS transistor grid, a discharge control MOS transistor grid, a charge control switching device, a control circuit and a discharge control switching device, wherein one pin of each single lithium battery protection chip is connected with a shunt discharge branch, and the shunt discharge branch is further provided with a branch resistor and a shunt discharge branch switching device. The equilibrium charging method can protect the battery pack and automatically charge and cut off the power supply, can realize the advantage of equilibrium charge, and solves the problem that the existing battery equilibrium charging method mostly realizes equilibrium charge at the charger end, the chargers for equilibrium charge are mostly customized and thus only suitable for batteries with corresponding models, the limitation is great, and the design and application cost of the lithium battery pack charger is increased.

The invention provides a vibration stirring type aggregate screening device. The vibration stirring type aggregate screening device comprises a screening main body structure, the screening main body structure comprises at least one screening frame, the at least one screening frame is internally provided with at least one layer of inverted V-shaped screening net with the middle being slightly highand the two sides being slightly low and a stirring device matched with the at least one layer screening net, each stirring device is arranged above the corresponding screening net and comprises a stirring shaft, a connection shaft and comb-like stirring teeth, and the stirring teeth are fixedly connected with the corresponding stirring shafts through the connection shafts and are also of invertedV-shaped structures with the middles being slightly high and the two sides being slightly low. By means of the vibration stirring type aggregate screening device, the screening efficiency can be effectively improved and the phenomena of screen jamming and stacking are avoided.

The invention discloses an LED illumination control system. A mixed type LED circuit is characterized in that a power supply side of a controllable LED circuit is serially connected with a voltage dividing LED; by controlling the output power of the controllable LED, the current flowing through the voltage dividing LED is adjusted, so the output power of the whole illumination circuit is controlled; the voltage dividing LED can be an alternating-current LED or a direct-current LED; the controllable LED can be a direct-current LED and the drive thereof or be an alternating-current LED and the drive thereof; and one part of LEDs in the LED illumination control system are free from a driving circuit, so the efficiency is quite high. Through the voltage division of the serially connected voltage dividing LED, the voltage resistance and the power of the controllable LED circuit are quite low, so the cost is lower. Thus, the system is suitable for an illumination system with quite high voltage power supply, such as commercial voltage power supply.

The invention reveals a row decoding circuit, which comprises n+1 control grid decoding circuits and current limiting biasing circuit; the current limiting biasing circuit comprises a first mirror image NMOS transistor and a resistive element, a source of the first mirror image NMOS transistor is input into an input voltage, a grid electrode of the first mirror image NMOS transistor is connected to a drain electrode, the drain electrode of the first mirror image NMOS transistor is connected to the resistive element in series, and the grid electrode of the first mirror image NMOS transistor outputs a bias signal; each control grid decoding circuit comprises a first NMOS transistor, a first PMOS transistor, a second NMOS transistor and a second mirror image NMOS transistor, the grid electrode of the second mirror image NMOS transistor accepts the bias signal, and a source of the second mirror image NMOS transistor is connected to the drain electrode of the first NMOS transistor. The invention also reveals a memory comprising the row decoding circuit, the row decoding circuit and the memory can provide negative pressure of controllable voltage transition rate for the control grid.