24results about How to "Small starting current" patented technology

The utility model discloses a temperature sensor system and circuit breaker, include: temperature sensor, power module, wireless communication module, monitoring module and control module, the power module with wireless communication module Control module and temperature sensor electricity is connected for each module power supply, monitoring module with power module and control module electricity is connected for monitoring voltage on power module and feedback control module, control module with temperature sensor and wireless communication module electricity is connected for according to the voltage of monitoring control temperature sensor and wireless communication module's data transmission, the temperature sensor system and circuit breaker of this application can reduce temperature sensor system's starting current effectively, reduce energy consumption, promote system stability.

The invention relates to the technical field of hydraulic couplers, in particular to an efficient multi-stage hydraulic coupler. The structure of the disc and the cavity groove is adopted, so that utilization of liquid kinetic energy is improved, loss in liquid flowing is reduced, efficiency is improved, the disc serves as a power transmission medium, full-load starting can be achieved, the starting time is prolonged, the initial starting torque of a prime motor is reduced, and the prime motor can start a working machine through the maximum torque; in the transmission process, impact can be relieved, torsional vibration can be isolated, overload protection is achieved, and the low overload coefficient and high efficiency are achieved.

The invention discloses a multi-phase synchronous generator test circuit and test method for starting in a motor mode, which solves the problem that it is difficult to start a multi-phase synchronous generator in a low-frequency and low-voltage mode during a test. The circuit comprises a multi-phase synchronous generator (1) to be tested, a first DC excitation power supply (3), a second DC excitation power supply (4), a twelve-phase synchronous generator (5), an asynchronous motor (6) and a variable frequency power supply (7), wherein the second DC excitation power supply (4) is electrically connected to the rotor winding of the twelve-phase synchronous generator (5), the asynchronous motor (6) is electrically connected to the variable frequency power supply (7), the stator winding voltage output end of the twelve-phase synchronous generator (5) is connected to the stator winding voltage input end of the multi-phase synchronous generator (1) to be tested, and the first DC excitation power supply (3) is electrically connected to an exciter (2) provided on the multi-phase synchronous generator (1). The starting current is small and there is no loss of step during the starting process.

The invention belongs to the technical field of transformer current limiting, and particularly relates to a transformer and an overcurrent suppression device and method. The method comprises the following steps: connecting a current-limiting reactor in series in each phase of the primary side of the transformer, and connecting a switch in parallel with the current-limiting reactor in each phase; firstly, a first-phase switch is controlled to be switched on, and after the first-phase switch is switched on, a second-phase switch is controlled to be switched on when the phase angle of line voltage between a first phase and a second phase is 30 degrees or 210 degrees; after closing of the second-phase switch is completed, primary side and secondary side currents of the transformer are detected, if the primary side and / or secondary side currents exceed the corresponding short circuit threshold value, the third-phase switch is not closed any more, other two-phase switches are controlled to be opened, and a current limiting reactor is connected to the primary side of the transformer; if the primary side current and the secondary side current do not exceed the corresponding short-circuit threshold values, the third-phase switch is controlled to be switched on when the phase angle of the line voltage between the first phase and the third phase is 30 degrees or 210 degrees, and the short-circuit current can be limited while the switching-on surge current of the transformer is limited.

The invention relates to the technical field of microwave switches, and discloses a microwave switch driving device and a high-power microwave switch, the driving device comprises a first mounting plate, a second mounting plate, a third mounting plate and a fourth mounting plate which are sequentially arranged from bottom to top, and lower electromagnetic driving assemblies are mounted on the first mounting plate and the second mounting plate; electromagnetic driving assemblies are mounted on the third mounting plate and the fourth mounting plate; the movable iron core of the upper electromagnetic driving assembly pushes the movable iron core of the lower electromagnetic driving assembly to move downwards in the process of moving downwards; when the microwave switch channel is controlled, the driving device drives the movable iron core in the lower electromagnetic driving assembly to move downwards through the downward movement of the movable iron core of the upper electromagnetic driving assembly, so that compared with the existing driving device, the movement distance of the movable iron core is shortened, the electromagnetic force required by the movement of the movable iron core during starting can be reduced, and the reliability of the microwave switch channel is improved. Therefore, the starting current of the coil can be reduced, and the power consumption of the microwave switch adopting the driving device can be reduced.

This invention proposes a charge pump circuit structure for AMOLED displays with low power consumption, low startup current, and high precision PWM modulation. It comprises five main modules: a charge pump module, a pulse width modulation module (PWM), a slope generation module, a logic module, and a driver module. Under light load, it can achieve low power consumption with a 0% duty cycle, offering advantages such as high efficiency, small area, and simple structure. It also features low startup current and high precision, with only one set of bus widths (FB), ensuring that FB equals VREF. Compared to digital adjustment methods, it achieves higher precision.

The utility model relates to the technical field of electronic circuits, and discloses a starting circuit and a chip, the starting circuit comprises a first charging circuit, a first transistor and a first capacitor, a gate-drain capacitor is arranged between the gate electrode and the drain electrode of the first transistor; a first end of the first charging circuit is connected with a power supply and a source electrode of the first transistor, a second end of the first charging circuit is connected with a first end of the first capacitor and a grid electrode of the first transistor, a second end of the first capacitor is connected with a drain electrode of the first transistor, and a first end of the first capacitor is connected with the grid electrode of the first transistor. The first charging circuit charges the first capacitor and the gate-drain capacitor based on the output voltage of the power supply; when the gate-source voltage of the first transistor reaches a first threshold value, the first capacitor and the gate-drain capacitor discharge. The starting current can be reduced based on the circuit.

The application relates to a high-power motor starting method based on variable frequency / power frequency switching, and comprises the following steps: obtaining a motor starting request; when the motor starting request exists, controlling to open a frequency converter and the motor; driving the motor to gradually run to power frequency, during which the output power phase sequence and frequency of the frequency converter are acquired in real time; comparing the output power phase sequence and frequency with the state during power frequency operation to obtain a comparison result; and when the comparison result meets a preset condition, instantaneously switching the motor to power frequency operation. A small frequency converter is used to assist in starting a high-power motor. During the starting process, the phase sequence and frequency of the internal output power of the frequency converter are collected, the phase sequence and frequency of the internal output power are compared with the theoretical values during power frequency operation, the motor is switched to power frequency operation when the preset condition is met, and starting is completed. The starting method has the advantages of small starting current, short starting time and low requirement on a transformer.

A control method for slow variable-power start-up of a scraper conveyor includes: controlling the start-up of the motors at the head and tail of the scraper conveyor in four stages: In the first stage, the conveyor starts from zero speed and accelerates uniformly until the output torque of the head motor reaches a first torque threshold, at which point it enters the second stage; in the second stage, the conveyor moves at a uniform speed at the speed at which it entered the second stage, until the chain tension reaches a tension threshold, at which point it enters the third stage; in the third stage, the conveyor uses the speed at which it entered the third stage as the initial speed, gradually increasing acceleration, and then gradually decreasing acceleration until the output torque of the head motor reaches a second torque threshold, at which point it enters the fourth stage; and in the fourth stage, the conveyor moves at a uniform speed at the speed at which it entered the fourth stage. This method can reduce the number of chain tension peaks and the vibration frequency.

The utility model relates to the technical field of generators, in particular to an emergency power supply system. The emergency power supply system comprises a variable frequency motor, a reverse dragging control module, an inverter, a power part and an energy storage battery, a rotor of the variable frequency motor is in transmission connection with the power part; the output end of the variable frequency motor is electrically connected with the input end of the inverter; the reverse dragging control module is electrically connected with the variable frequency motor and the inverter and is in communication connection with the inverter. The inverter is electrically connected with the power part and the energy storage battery, the generator can be started without starting a motor, the starting current is small, and the problems that the load cannot be carried due to instant overload of the generator and the energy use efficiency is low can be solved.

The utility model relates to the technical field of thick film heating, and discloses a thick film heating device which comprises a heating disc, an aluminum sleeve shell is connected to the outer side of the heating disc in a sleeved mode, a first heat dissipation strip is arranged on one side of the aluminum sleeve shell, and a second heat dissipation strip is arranged on the other side of the aluminum sleeve shell. The heating disc, the aluminum sleeve shell, the first heat dissipation strip and the second heat dissipation strip are assembled into a group of heating structures, and the thick film heating device is formed by combining a plurality of groups of heating structures which are assembled by the heating disc, the aluminum sleeve shell, the first heat dissipation strip and the second heat dissipation strip. According to the thick film heating device, the multiple heating discs, the aluminum sleeve shell, the first heat dissipation strip and the second heat dissipation strip are assembled into the thick film heating device, temperature rise is fast, efficiency is high, the service life is long, the weight is light, compared with a traditional ceramic PTC heating piece, the starting current is small, multiple sections of circuits can be printed, and power and heat productivity are convenient to control.

This disclosure provides embodiments of a black-start system, black-start method, and medium suitable for pure hydrogen gas turbine units. One specific embodiment of the black-start system includes: a control device communicatively connected to the power grid, a frequency converter, the pure hydrogen gas turbine unit, and a diesel generator; a hydrogen storage device is pipe-connected to the pure hydrogen gas turbine unit; the control device is configured to control the diesel generator to perform a start-up operation; the frequency converter includes a rectifier assembly and an inverter assembly; the control device is configured to determine switching frequency information based on parameter information; invert the rectified DC power; the control device is configured to control the pure hydrogen gas turbine unit to perform an operating operation; the pure hydrogen gas turbine unit is electrically connected to the power grid; the control device is also configured to control the diesel generator to perform a shutdown operation and to control the pure hydrogen gas turbine unit to continue operating. This embodiment can improve the safety and reliability of the black-start system.

The present invention relates to the technical field of desulfurization demisters, and in particular to a water pump structure for flushing desulfurization demisters. It specifically includes: a first pump body; a second pump body; a first connecting pipe; a first water inlet, a first water outlet, a first power member, an adjusting part, connected to the first pump body and the second pump body, and used to control the water flow rate of the first pump body and the second pump body; a first monitoring part, which sets the operating speed of the first power member. The second water inlet, the second water outlet, the second power member, the first connecting pipe, and the second monitoring part can dynamically adjust the operating current of the first power member and the second power member by setting the working level of the water pump, so as to realize the flushing requirements of different layers of demisters by adjusting the water pump speed through frequency conversion, and dynamically adjust the flushing water pressure and flow of the system; at the same time, avoid the impact hazards caused by large fluctuations in water pressure during the flushing process.

A feeder for reducing the pressure of grain on a grain dispensing system includes a grain storage device for holding grain, a grain outlet for grain outflow, and a grain dispensing system disposed within the grain storage device to intermittently guide grain into the outlet. A grain retainer is also disposed within the grain storage device, shielding the grain dispensing system, and the orthographic projection of the retainer towards the grain dispensing system covers the system. At least one leakage port is provided on the retainer for grain to leak out towards the grain dispensing system. This technical solution reduces the resistance of the grain within the grain storage device to the grain dispensing system when the system is activated, effectively protecting the normal operation of the grain dispensing system and extending its service life.

The utility model relates to a vertical mill direct-drive transmission system which comprises a servo direct-drive motor, the servo direct-drive motor comprises a shell, the upper end of the shell is connected with a millstone supporting mechanism, a junction box is arranged on the outer wall of the shell, a stator assembly connected with the junction box is arranged on the inner wall of the shell, and a rotor transmission shaft is rotationally arranged in the center of the shell through a bearing. A rotor assembly matched with the stator assembly to work is arranged on the rotor transmission shaft, a sleeve hole is formed in the upper end of the rotor transmission shaft, a rotary encoder is connected to the lower end of the rotor transmission shaft, a driving shaft in the millstone supporting mechanism is arranged in the sleeve hole in a sleeved mode, and a plurality of cylindrical pins used for power transmission are arranged between the driving shaft and the rotor transmission shaft. The device has the advantages of reasonable structural design, direct drive, small occupied space, energy-saving drive, high efficiency, accuracy and the like.

This invention belongs to the technical field of temperature control methods for fiber laser chillers, and particularly relates to a method for controlling the low-temperature outlet water temperature of a chiller based on a bypass valve and a compressor misalignment switch. The method includes the following steps: determining the preset temperature, temperature control accuracy, and accuracy coefficient; closing the bypass valve; starting the chiller and compressor normally; continuously monitoring the actual low-temperature outlet water temperature after the chiller starts running; and combining control of the compressor and bypass valve according to different states to maintain the low-temperature outlet water temperature within a reasonable range. This application, based on the changes in the low-temperature outlet water temperature of the chiller, utilizes a combination of compressor start control and bypass valve on / off control to achieve rapid balance of high and low pressure differences, creating conditions for the next compressor start-up more efficiently and accurately, reducing the starting current, and simultaneously improving the temperature control accuracy of the chiller water. This avoids the problem of frequent laser alarms and malfunctions due to excessive water temperature fluctuations in complex environments.

The application discloses an automatic mechanism sand production device and belongs to the technical field of mechanism sand production. The device comprises a sieve box, an exciting shaft, a rotating disc and a motor, a radial sliding slot is formed in the rotating disc, a counterweight block is slidably arranged in the sliding slot, and a return spring is arranged between the counterweight block and the bottom of the sliding slot. The centrifugal force received by the counterweight block when the exciting shaft rotates is balanced with the elastic force of the return spring. When the load change causes the rotating speed fluctuation, the counterweight block automatically slides in the radial direction to change the eccentric distance, so that the exciting force size is adjusted, and the rotating speed negative feedback stability mechanism is formed. The application can realize the self-adaptive adjustment of the exciting force with the load without a sensor and a controller, effectively reduces the starting current, stabilizes the screening efficiency, prolongs the service life of the equipment, and has the advantages of simple structure and high reliability.

The invention discloses a transmission system and a motor starting control method. The transmission system comprises a motor; one end of the speed regulator is connected with the motor, and the other end is disconnected with the load before the motor is started and connected with the load after the motor is started; the control system is used for controlling the operation states of the motor and the speed regulator; before the motor is started, the control system controls the motor to be powered off and controls the speed regulator to be powered on, so that the speed regulator drives the motor to rotate, and when the motor reaches the rated rotating speed, the control system controls the speed regulator to be powered off and simultaneously controls the motor to be powered on. According to the invention, the starting impact can be reduced, the influence on the motor and the power grid is reduced, the current demand during starting is reduced, the capacity of a power grid system is reduced, smooth starting can be realized, the motor is driven to rotate through the speed regulator, the motor generates no-load counter electromotive force, and the motor can be started more stably when electrified; the reliability and the stability of motor starting are improved, and the mechanical stress during motor starting is reduced.

The invention provides a novel electric vehicle starting method and system. The method comprises the following steps that an electric vehicle rotating handle rotates to send out an electric signal; performing linear integration on the electric signal sent by the rotating handle to obtain a starting signal; and the driving controller receives a starting signal obtained in the linear integration process, outputs a driving signal of which the frequency is linearly increased based on the starting signal, and drives the motor to linearly increase the rotating speed until the starting is completed. According to the invention, the constant acceleration starting of the motor is realized, so that the starting current is reduced, the waste of the current is avoided, the energy efficiency during the starting of the motor is improved, and the endurance mileage of the electric vehicle is improved.

The invention discloses a vehicle hill starting control method, relates to the technical field of vehicle control, and solves the problems of large motor starting current and unsmooth motor starting when a motor of a storage vehicle is started with load. The control method comprises the following steps: acquiring starting data of the storage vehicle on a ramp, and recording data acquisition time; starting parameters of a control mechanism of the storage vehicle are calculated, and the starting data and the starting parameters are cleaned; when the storage vehicle starts on a half slope, performing staged control on starting current of kinetic energy equipment according to the starting parameters so as to generate a current control data table; calculating a speed control curve and a current control curve of the kinetic energy equipment; a monitoring feedback module is used for monitoring the starting data in real time by using the monitoring correction model so as to judge and feed back the starting result of the storage vehicle; according to the starting result of the storage vehicle, the speed control curve and the current control curve are corrected; and speed closed-loop control is carried out on the kinetic energy equipment, and generalization and correction are carried out on the monitoring correction model.

The utility model discloses a fixing base of a tower type underneath twin-well pumping unit. The fixing base comprises a splicing mechanism and a speed reducer installed at one end of the splicing mechanism. A clamping mechanism is arranged on the outer side of the splicing mechanism, and one end of the clamping mechanism is fixedly connected to the outer side of the arc plate; the splicing mechanism comprises a switched reluctance motor, the output end of the switched reluctance motor is fixedly connected with a coupler, and the end, away from the switched reluctance motor, of the coupler is fixedly connected with a speed reducer. The outer side of the switched reluctance motor is fixedly connected with a plurality of first fixing blocks, the number of the first fixing blocks is eight, and the first fixing blocks are evenly distributed at the upper end and the lower end of the outer side of the switched reluctance motor. The outer side of the first fixing block is fixedly connected with an aluminum cooling fin, and the aluminum cooling fin can be rapidly installed on the outer side of the switched reluctance motor through the arrangement of the splicing mechanism, so that the cooling efficiency of the switched reluctance motor is improved, and the service life of the switched reluctance motor can be prolonged.

The utility model relates to the technical field of alternating current contactors, in particular to a novel mute contactor with a circuit board, which comprises a shell and a coil framework, the coil framework is mounted in an inner cavity of the shell, four wiring pins are arranged on one side of the coil framework and are arranged in a rectangular manner, and the circuit board is arranged on the other side of the coil framework. The four wiring pins and the circuit board are arranged and the circuit board is welded on the four wiring pins under the condition that the wire diameter and the number of turns of the coil are designed to be the same as those of a conventional coil, namely the coil resistance is the same, when the coil is electrified, alternating current is converted into direct current through components of the circuit board, and the direct current is converted into direct current through components of the circuit board. The starting current is relatively small, the noise generated during actuation is very small, and the energy consumption is relatively low, so that the novel mute contactor with the circuit board is different from a conventional alternating current contactor, the alternating current is converted into the direct current through a circuit board program, the noise generated during actuation of the coil assembly is reduced, and the power consumption of the contactor is reduced.

The present invention discloses a control system for an radome air conditioning system, comprising a control mainboard AP1, an operation panel AP2, a frequency conversion board AP3, a module board AP4, a power supply part, a signal detection part, and an electrical drive part. The control mainboard AP1 is connected to the operation panel AP2 and the frequency conversion board AP3, and the frequency conversion board AP3 is connected to the module board AP4; the power supply part introduces a three-phase live wire and a neutral wire and supplies power to other power-consuming units, the signal detection part detects the temperature data of the radome air conditioning system, and the electrical drive part is used to drive the air conditioning part to work. The present invention can automatically detect and control the temperature, humidity, and flow rate of the air in the radome, and is provided with protection functions such as power supply anomaly, system pressure, module overheating, high compressor exhaust temperature, heating, and antifreeze; the high-voltage DC frequency conversion technology is adopted to ensure that the antenna works continuously and uninterruptedly around the clock.

The present invention relates to the technical field of screw superchargers, specifically a single screw supercharger, including an air filter, an unloading valve, a main engine, and a gas-liquid separator. The air filter and the unloading valve are connected via an air guide pipe, the unloading valve is connected to the air inlet end of the main engine, the air inlet at the upper end of the gas-liquid separator is connected to the unloading shutdown venting channel, the end of the unloading shutdown venting channel is divided into an unloading pressure maintaining regulating circuit and a main engine unloading air supply circuit, the unloading pressure maintaining regulating circuit is connected to the air guide pipe, the main engine unloading air supply circuit is connected to the main engine, the air inlet pipe of the air filter is provided with a pressure regulating valve and an electric valve, the electric valve is located at the rear end of the pressure regulating valve, the electric valve is controlled by an electric signal, the unloading valve is a pneumatic valve, the coolant outlet of the gas-liquid separator is connected to the main engine through a liquid circuit, and the liquid circuit is provided with a liquid cooler, a liquid filter, and a water cut-off solenoid valve. The advantages are that the supercharger is energy-saving, frequent shutdowns are avoided, and system reliability is improved.