25 results about "Adjustable-speed drive" patented technology

A submersible well fluid system for operating submerged in a body of water may include an electric machine and a fluid end. The electric machine includes a rotor and a stator residing in a first housing at specified conditions. The fluid end may include an impeller and be coupled to the electric machine. The submersible well fluid system may also include an adjustable speed drive for the electric machine in the housing. The submersible well fluid system may also include a chemical distribution system for supplying treatment chemicals to the submersible well fluid system, a barrier fluid supply system for supplying a barrier fluid to the submersible well fluid system, and a pressure management system.

The utility model relates to a tunnel ventilation equipment technical field, concretely is an intelligent tunnel ventilation control system based on stepless speed regulation technology. Include: wind speed sensor for real -time monitoring the wind speed in the tunnel, main control unit for receiving the data of wind speed sensor, calculates the fan speed regulation amount, and generates control instruction, stepless speed regulation drive module is connected with main control unit, realizes the smooth stepless regulation of fan blade rotating speed through the adjustment fan input voltage or frequency, feedback module is used for real -time monitoring the actual rotating speed and operating condition of fan, and the data is fed back to main control unit, forms closed -loop control, communication module, communication module connects feedback module, is used for realizing remote control and data interaction, storage module is used for storing wind speed, rotating speed and control instruction historical data, user interface is used for providing operation interface, and the user sets target wind speed through touch -sensitive screen or remote control equipment.

The present invention is directed at a method for evaluating the degradation level of capacitors of a power filter connected to an adjustable speed drive (ASD) or a power converter. The invention is also directed at an adjustable speed drive and a power converter provided for performing the method.

The invention relates to the technical field of induced draft fan control systems, and discloses a low-speed stability control system of a large-diameter retroverted impeller induced draft fan, which is in communication connection with a speed regulation driver of the induced draft fan and is used for inhibiting a rotating stall phenomenon of the fan caused by airflow separation under a low-speed working condition. The system comprises the following cooperative work modules: a dynamic pressure sensing module, an intelligent feature analysis module, a multi-mode anti-instability control module and a system safety guarantee module. According to the low-speed stability control system of the large-diameter backward-inclined impeller induced draft fan, the system has good expansibility and maintainability through modular design. The four-layer structure is clear in division of labor and works cooperatively, so that the real-time performance of control is ensured, and the reliability of the system is improved. Compared with a traditional single control mode, according to the structure, the instability early warning time is advanced by 5-10 minutes, the control precision is improved by 40% or above, and the operation stability of the draught fan under the low-speed working condition is remarkably improved.

The utility model discloses a full-automatic carton packaging machine with an adjustable conveying belt, and relates to the technical field of carton packaging. The paper wrapping machine comprises a rack, a support is fixedly connected to the rear side of the rack, a first air cylinder is fixedly connected to the bottom of the support, and a paper wrapping machine is fixedly connected to the bottom of the first air cylinder. And a speed regulation driving transmission assembly is arranged at the top of the rack. The speed regulation driving transmission assembly is arranged and comprises the motor and the frequency converter, the conveying speed of the conveying belt can be adjusted according to actual production requirements, it is ensured that the conveying speed of cartons is matched with the scrap cleaning speed, the carton stacking phenomenon is avoided, and the production efficiency is improved; comprising a baffle, a vertical plate and a fan, a relatively sealed space can be formed in the carton conveying process, paper scraps are effectively prevented from flying around, the packaging operation environment is improved, and the cleaning workload is reduced.

The invention relates to the technical field of industrial automatic conveying systems, and discloses a conveying belt anti-blocking energy-saving control system and method based on multi-sensor collaboration.The conveying belt anti-blocking energy-saving control system comprises a conveying belt unit, a sensor unit, a speed-adjustable driver and a central controller, the conveying belt unit is composed of multiple stages of conveying belts which are sequentially connected, and the sensor unit is connected with the speed-adjustable driver; comprising a position sensor installed at the tail end of each belt, a counting sensor arranged at a system inlet or a key node, a speed-adjustable driver, a motor for driving each conveying belt and capable of receiving a speed control signal to adjust the speed, and a central controller comprises a core processing unit, a timer, a human-computer interaction interface and an alarm. Position sensor signals and the timer cooperate to judge material blockage, the belt speed is dynamically adjusted, energy saving is achieved, and the device is suitable for high-safety scenes such as civil explosions.

A system includes: a speed adjustable driver (ASD) module, the module including an input, an output, and a plurality of ASDs in parallel, each ASD including: a rectifier electrically connected to the input of the ASD module; an inverter electrically connected to an output of the ASD module, the inverter comprising a plurality of controllable switches configured to switch at a switching frequency; and a direct current (DC) link electrically connected to the rectifier and the inverter; and a control system connected to the ASD module, the control system configured to compensate for the plurality of circulating currents.

A pumping system includes a plurality of interconnected integrated motor / pump modules (IMPs) submerged in a process liquid, such as liquid hydrogen (LH2), within a container, the IMPs being separately controlled by adjustable speed drives (ASDs). The rotation speeds of the IMP impellers are controlled such that the NPSH_A for each IMP remains above a minimum, critical suction head NPSH_c of the IMP, while the outlet pressure and flow of the last IMP is maintained at a specified level unless its NPSH_A falls substantially to its NPSH_c, or until the container is substantially empty. The IMPs can be identical, initially operating at the same speeds, or the first IMP can be an inducer IMP having a reduced NPSH_c. The IMPs can comprise permanent magnets or induction coils attached to their impellers that pass in proximate radial or axial alignment with stator coils. The ASDs can be variable frequency drives (VFDs).

The invention belongs to the technical field of permanent magnet speed regulators, and particularly relates to a permanent magnet speed regulation driving device for an energy-saving generator set, which comprises a casing, a driving end and a load end are arranged in the casing, and a permanent magnet a is arranged on the driving end; the driving part comprises a sliding frame, a bidirectional lead screw and a push block are arranged in the machine shell, and the push block is connected with the sliding frame; the emergency part comprises a sleeve b, a push plate and a permanent magnet b are arranged on the sleeve b, a limiting block is connected to the push plate, and a check block and a storage groove are arranged on the sleeve b; and the control part comprises a warning lamp, and an ejector rod is connected into the machine shell. The permanent magnets at the load end and the driving end can be driven to be close to or far away from each other at the same time, half of the moving process is reduced, the two sets of permanent magnets are automatically driven to be far away under the condition that the load end is stuck in an emergency, the driving part is prevented from independently bearing acting force, and after the condition is relieved, the control device rapidly returns to the normal state.

A system comprises: a module for an adjustable speed drive, an ASD module comprising an input, an output, and a plurality of parallel-connected ASDs, each ASD comprising: a rectifier electrically connected to the input of the ASD module; an inverter electrically connected to the output of the ASD module, the inverter comprising a plurality of controllable switches configured to switch at a switching frequency; and a DC link electrically connected to the rectifier and the inverter; and a control system coupled to the ASD module, the control system being configured to compensate for a plurality of circulating currents.

The utility model discloses a gearbox and a rhizome medicinal material harvester with variable angle and rotating speed, and the gearbox comprises a box body, an input shaft, a transmission shaft, an intermediate shaft, a speed regulation shaft, a first output shaft, a second variable speed output shaft and a speed regulation drive; the medicinal material harvester comprises a medicine digging shovel, a main rack, a middle rack and a tail rack. The medicinal material harvester has the advantages that the angles of the middle rack and the tail rack of the medicinal material harvester are adjustable, the inclination angle of the mesh belt conveyor is adjustable, and the purpose of adjusting the screening efficiency is further achieved. In a word, the medicine digging shovel of the medicinal material harvester can realize vibration medicine digging, and the rotating speed and the inclination angle of the mesh belt type conveyor can be adjusted, so that the harvesting requirements of rhizome medicinal materials with different depths can be met, and the medicinal material harvesting rate can be improved.

The present disclosure provides a method for estimating capacitor degradation and a device performing the same. The present invention relates to a method for estimating a degree of degradation of a capacitor of a power filter connected with an adjustable speed drive (ASD) or a power converter. The present invention also relates to an adjustable speed drive and a power converter for performing the method.

The invention relates to the field of power electronic converter control, and discloses a high-power active variable inductor for a speed-adjustable driver and a control method thereof.The high-power active variable inductor comprises a positive inductor and a negative inductor, the positive inductor is a traditional physical inductor, and the negative inductor is obtained through equivalence of a single-phase inverter; by connecting the positive inductor and the negative inductor in parallel, the overall equivalent inductance value is increased, and meanwhile, a wider-range adjusting space is provided, so that a better filtering effect is achieved, the equivalent inductance value can be adjusted in a wide range, the power density is high, implementation is easy, three-phase imbalance can be dealt with, the electric energy quality of a speed-adjustable driver is improved, and the service life of a direct-current side filtering capacitor is prolonged; the problems that a direct-current side passive filter of an existing speed-adjustable driver is heavy, the inductance size of an active capacitor is difficult to reduce, and the adjusting range of an existing active inductor is narrow are effectively solved.

The invention discloses an in-situ sludge reduction device with a biological enzyme replacing a traditional carbon source, and relates to the technical field of sewage treatment, the in-situ sludge reduction device comprises a compound enzyme catalytic reaction kettle, an enzyme preparation storage and control box, a metering and adding module and a compound stirring reaction unit, the enzyme preparation storage and control box and a self-adaptive air pump are arranged on the compound enzyme catalytic reaction kettle, and the self-adaptive air pump is arranged on the self-adaptive air pump; the enzyme preparation storage control box comprises an intelligent process control terminal, an arc-shaped guide groove and a spiral propulsion roll shaft, a variable frequency motor drives the roll shaft to precisely feed enzyme, a composite stirring reaction unit is arranged in an inner tank, upper and lower bearing blocks are connected with four mounting plates through linkage rods and supporting rods to form a stirring frame, a high-speed shearing motor drives rotation, and a self-adaptive air pump adjusts lifting. A flexible bionic desilting scraper is arranged on the mounting plate and attached to the tank wall for desilting, the metering and adding module comprises a flow guide mixing barrel, a speed-adjustable driving machine drives a two-way material blocking attaching roller to conduct stable-pressure feeding, the materials are sprayed out through a jet flow nozzle after being accurately controlled by a metering valve, a traditional carbon source is replaced, the problems of poor mixing and inaccurate adding are solved, the decrement efficiency is improved, and the cost is reduced.

The utility model relates to the technical field of glass product production, and aims to provide glass product production cooling equipment which comprises a bottom plate, a conveying assembly arranged on the bottom plate, a driving assembly arranged on the conveying assembly, a supporting assembly arranged below the bottom plate, a first cooling assembly arranged on the supporting assembly and a second cooling assembly arranged on the supporting assembly. The supporting assembly is provided with a temperature sensor, the temperature can be monitored in real time, cooling parameters can be adjusted in time, the cooling effect is guaranteed, and energy waste is avoided. The cooling assembly is matched with uniformly distributed cold air nozzles through a cold air pump, and cooling is uniform and efficient. And the conveying assembly is matched with the speed-adjustable driving motor, conveying is stable, the speed can be flexibly adjusted, and different production rhythms are adapted. The whole equipment effectively improves the cooling quality and the production efficiency of glass products, and reduces the reject ratio and the production cost of the products.

The utility model discloses an internal combustion locomotive stepless speed regulation driver test bench comprising a box body, the side surface of the box body is provided with an air inlet, and the outside of the air inlet is fixedly provided with a dustproof assembly; the box body comprises a shell, a motor assembly is fixedly installed in the front of the interior of the shell, a motor assembly is fixedly installed on the outer side of the shell, an external plug is fixedly installed on the side face of the shell, and a PLC and a power source are fixedly installed at the bottom of the interior of the shell. According to the test bed for the stepless speed regulation driver of the internal combustion locomotive, a control signal of a test target stepless speed regulation driver is simulated through the PLC, so that the stepless speed regulation driver drives the stepping motor to work, meanwhile, data of the stepping motor are collected through the encoder to be processed and calculated, and related data results are displayed in the touch screen; therefore, manual estimation according to experience is not needed, test accuracy is improved, and errors are reduced.

The invention relates to a method of estimating a single-phase resistance of a motor by means of an adjustable speed drive (ASD) while the motor is running and / or at standstill, controlled by the adjustable speed drive. The motor is an asynchronous motor or a synchronous motor. The invention also relates to an adjustable speed drive for performing the corresponding method.

The application provides a fan speed regulation system and an uninterruptible power supply. The system comprises a power supply transformer, a fan, an auxiliary power supply, a speed regulation switching circuit, a controller and a speed regulation driving circuit. The first switching path of the speed regulation switching circuit is connected to the high-voltage output end of the power supply transformer and the fan when the first control path is not turned on. The second switching path is connected to the low-voltage output end of the power supply transformer and the fan when the second control path is turned on. The speed regulation driving circuit processes the high-speed initial signal and the low-speed initial signal of the fan output by the controller and outputs the high-speed control signal and the low-speed control signal to make the first and second control paths be turned on at the same time, be turned off at the same time or make the first control path be turned on and the second control path be turned off. The auxiliary power supply is used to supply power to the controller, the first and second control paths. The above structure not only prevents the short circuit of the power supply transformer, but also enables the fan to run at full speed when the auxiliary power supply is powered off, thereby ensuring the safe and stable operation of the uninterruptible power supply.

The invention discloses a bicycle electric control stepless speed change hub which comprises a hub shell and a planetary transmission mechanism arranged in the hub shell, the planetary transmission mechanism comprises a planet carrier, a sun gear, a gear ring and a planetary gear, and the planet carrier is in transmission connection with a bicycle flywheel to serve as a first input end; the gear ring is fixedly connected with the hub shell to serve as an output end, and the sun gear is connected with the speed regulation driving mechanism to serve as a second input end. A speed measuring coded disc and a speed measuring sensor are arranged in the hub and used for obtaining the planet carrier rotating speed and the output rotating speed and sending the rotating speed to the controller. The controller controls the speed regulation driving mechanism based on the riding state, automatic speed change under different working conditions is achieved, and the system is kept in a ridable passive transmission state in a power-off state. The invention has the advantages of continuous speed change, compact structure and stable control, and is suitable for the field of bicycles and electric power-assisted bicycles.

The application provides an energy-saving speed-regulating blade adjusting device of an industrial fan, which comprises a fan shell and a speed-regulating blade module. A fan main shaft is arranged at the central position inside the fan shell. The speed-regulating blade module comprises a hub base fixedly installed at the end of the fan main shaft. A plurality of groups of blade mounting seats are embedded in the inner circumferential direction of the hub base. An adjusting blade is rotatably assembled in each group of blade mounting seats through a rotating pin shaft. An annular gear ring is arranged coaxially with the fan main shaft in the hub base. A driving gear is meshingly matched with the inner side of the annular gear ring. A speed-regulating driving motor is connected to the input end of the driving gear. A locking assembly is further arranged on the outer side wall of the hub base. The application has the following beneficial effects: the full-internal structure is adopted, the internal space of the fan is fully utilized, the overall size of the fan is not changed, the universality is high, the air volume and air pressure are accurately controlled by adjusting the blade inclination angle, the fan is efficiently operated, the useless power consumption is reduced, the energy-saving effect is remarkable, the supporting limiting and locking structure is stable and reliable in operation.

The application discloses a high-speed hair dryer styling blowing control method. The high-speed hair dryer adopts a brushless direct-current motor and is provided with at least a first blowing function and a second blowing function. The method comprises the following steps: in response to a switching signal from the first blowing function to the second blowing function, the brushless direct-current motor is controlled to exit a first driving mode and enter a second driving mode; in the second driving mode, it is judged whether the rotating speed of the brushless direct-current motor meets a preset rotating speed; if yes, the second driving mode is exited, the brushless direct-current motor is controlled to work in a third driving mode, and the driving frequency is adjusted according to the difference between the target rotating speed of the second blowing function and the current rotating speed, so that the brushless direct-current motor is smoothly reduced to the target rotating speed; wherein the first driving mode and the third driving mode both comprise a PID constant-speed driving mode, and the second driving mode comprises a PID speed-regulating driving mode. The application can reduce the additional noise generated when the high-speed hair dryer is switched from the first blowing function to the second blowing function.

This invention discloses an elevator safety clamp wedge performance testing machine, belonging to the technical field of elevator safety clamp wedges. It includes a test turntable assembly, an adjustable speed drive system, a multi-stage speed control mechanism, and an adjustable counterweight system. The test turntable assembly has a workstation mounting section. The adjustable speed drive system includes a variable frequency speed control motor that drives the test turntable to rotate via a drive gear and a driven gear, with a speed range of 0.5 m / s to 5 m / s, corresponding to 10% to 100% of the elevator's rated speed. The multi-stage speed control mechanism has a speed control module with five preset speed levels and is equipped with a speed feedback sensor to achieve closed-loop speed regulation. The adjustable counterweight system achieves counterweight adjustment within the range of 0 kg to 1000 kg via a counterweight slide rail and counterweight blocks. This invention also includes a linkage control unit and a working condition recipe library module, supporting combined speed and load working condition linkage testing. It can call preset standard working condition recipes with one click and automatically configure test parameters, improving testing efficiency.

The application discloses a three-wire fan compound control system based on feedforward lookup table and PI feedback, wherein a target setting and error generation module is used for receiving a target rotating speed instruction of an MCU, comparing the target rotating speed instruction with filtered rotating speed, and calculating a real-time rotating speed error; a signal acquisition and processing module is used for collecting a three-wire fan operation pulse signal in real time, an MCU records a pulse interval time, and a real-time rotating speed is calculated according to a preset "pulse frequency-rotating speed" mapping relationship; a compound control amount calculation module generates a control amount by using a compound algorithm combining feedforward and proportional-integral feedback; a synthetic output module superimposes a basic duty cycle obtained by the compound control amount calculation module and a duty cycle adjustment amount, obtains a target PWM duty cycle, and performs output limiting; a driving execution module converts the target PWM duty cycle into a corresponding pulse width signal, and outputs the pulse width signal to a fan speed regulation driving circuit, so that accurate rotating speed control is realized by adjusting an average voltage on a power supply line, and the fan can be ensured to stably operate at a target rotating speed.