612 results about "Variable-frequency drive" patented technology

The variable-frequency heat recovery system comprises a compressor unit, three heat exchangers, a variable-frequency driving module and a liquid storage device, the compressor unit can be connected with any two heat exchangers to form a refrigerant circulation loop, and an inlet pipe of the liquid storage device is connected to the outlet side of a condenser of the refrigerant circulation loop; the variable frequency driving module is provided with a heat dissipation pipeline, and the heat dissipation pipeline is connected with an inlet pipe of the liquid storage device in series so that refrigerants conveyed to the liquid storage device can pass through the heat dissipation pipeline. According to the heat recovery system, the pipeline connecting structure in the system is designed, the refrigerant before throttling is adopted to cool the variable frequency driving module, the cooling effect of the variable frequency driving module in different modes is ensured, and the reliability of the heat recovery system is improved.

The invention provides an isolation switch control device with a fault monitoring function, and relates to the technical field of electric power automation, and the device comprises an information collection module which collects the current information in real time during the operation of an opening and closing drive motor, and transmits the current information to a circuit protection module; the circuit protection module performs feature extraction on the current information in a mode of solving a signal waveform envelope line; whether the disconnecting switch has a fault is determined according to the current signal characteristics, and a control instruction is issued to the variable frequency driving module according to a fault result, or a key monitoring prompt is sent to the key monitoring module; the variable frequency driving module controls the operation state of the opening and closing driving motor according to the issued control instruction; and when the key monitoring module receives the key monitoring prompt sent by the circuit protection module, the monitoring frequency of the isolation switch is increased. According to the scheme, the abnormal state of the isolating switch can be monitored in the opening and closing process, so that serious accidents caused by faults of the isolating switch are reduced.

A system can include an axial field rotary energy device with an axis of rotation and a rotor coaxial with the axis and having a shaft, bearings, rotor disks that are coaxial and permanent magnets on each rotor disk. A printed circuit board (PCB) stator is located between the rotor disks to define an air gap on each side of the PCB stator. An enclosure has two enclosure sections with an inspection port. Bearing caps and bearings are mounted to the rotor. A variable frequency drive (VFD) assembly is coupled to the axial field rotary energy device. The VFD has a flexible conduit that extends between the VFD housing and the axial field rotary energy device. The flexible conduit can adapt to different sizes of axial field rotary energy devices.

A system has an axial field rotary energy device with an axis, a printed circuit board (PCB) stator and a rotor with a rotor shaft and rotor disks having respective permanent magnets (PM). The rotor rotates about the axis relative to the PCB stator. A variable frequency drive (VFD) has VFD components coupled to the axial field rotary energy device. A device enclosure contains the axial field rotary energy device. A VFD enclosure contains the VFD, and the device and VFD enclosures are axially aligned and coupled to each other. A cooling system is integrated within the device and VFD enclosures and cools the axial field rotary energy device and the VFD. The cooling system has a cooling fan located axially outboard of the device and VFD enclosures. The cooling fan circulates an air flow radially and axially relative to the device and VFD enclosures.

The invention discloses a variable frequency driving device energy recovery control system based on direct power supply of a high-voltage power grid, and relates to the technical field of electrical transmission and energy recovery control. Updating the power grid impedance model in real time by using a complex impedance calculation method; load operation state parameters are dynamically adjusted in combination with motor end output power, rotating speed change and torque calculation; according to the method, regenerative energy is accurately calculated, a feedback path is adjusted according to voltage fluctuation and frequency deviation of a power grid, a feedback current fluctuation ratio and a power factor are monitored, a feedback path conduction proportion is optimized in real time, when the current is unstable or the power factor is abnormal, a suboptimal path is automatically switched, and continuous and stable operation of a system is guaranteed; according to the invention, the energy feedback efficiency and the power grid compatibility of the high-voltage power grid variable-frequency driving device are effectively improved, and the method is suitable for energy feedback application of a high-power motor driving system.

The invention relates to the technical field of motor fault diagnosis, in particular to a fault diagnosis method of a drilling machine variable frequency driving motor based on IMSOA-MCNN-BIGRU, and the method comprises the steps: collecting the current data of an experiment platform motor, and adding interference to simulate the data of a real drilling machine driving motor; a population initialization strategy of an SOA algorithm is improved, opposite-reverse learning is introduced in an iteration process, and an adaptive worst resampling mechanism after stagnation monitoring is added; the size of a convolution kernel, the size of a hidden layer, an initial learning rate and L2 regularization intensity of the MCNN-BIGRU model are optimized based on IMSOA, and optimized parameters are endowed to the MCNN-BIGRU model again so as to construct an IMSOA-MCNN-BIGRU classification model; and inputting the current data into which the interference is added into the IMSOA-MCNN-BIGRU classification model to obtain a diagnosis result. According to the method, the MCNN and the BIGRU are combined and complemented, the characterization capability and the fault judgment precision of complex non-stationary signals are improved, the MCNN-BIGRU model is optimized by using the improved sea gull optimization algorithm, and the performance of the model is improved.

A method and system are disclosed for providing electrical power from a utility electric grid to a fracturing operation, and an electrically powered fracturing system. A mobile substation includes at least two transformer units that are operatively coupled to the utility electric grid in a parallel orientation, wherein the transformer units are capable of receiving power from the utility electric grid and stepping down the power for delivery to a switchgear. An electric motor is operatively coupled to a hydraulic fracturing pump and operatively controlled by a variable frequency drive. At least one open air relay cable is operatively coupled between the switchgear and the electric motor and capable of delivering power to the electric motor.

The invention discloses an energy-saving and consumption-reducing control method and system for a multi-stage variable frequency driven underground belt conveyor, and the method comprises the steps: obtaining coal flow data and conveying belt operation speed data according to a coal flow weight signal and an operation speed signal, and carrying out the filtering processing; abstracting and constructing a type-2 fuzzy set of the input parameters; and starting the belt conveyor, and performing multi-stage accurate control on the belt conveyor in combination with the two-degree-of-freedom PID and the type-II fuzzy set. According to the system, a coal flow monitoring sensor is installed on a belt conveyor; the speed sensor is mounted on the driving roller; the composite frequency conversion unit comprises a main frequency conversion unit and auxiliary frequency conversion units I and II, the main frequency conversion unit comprises a main frequency converter and a main motor which are connected, and each auxiliary frequency conversion unit comprises an auxiliary frequency converter and an auxiliary motor which are connected; the controller is connected with the coal flow monitoring sensor, the speed sensor, the composite frequency conversion unit and the human-computer interaction interface. According to the method and the system, multi-stage accurate control on the running speed of the belt conveyor can be realized, and the energy-saving effect is ideal.

A variable frequency drive with natural heat dissipation, comprising a housing and a front cover, wherein a mounting pad is fixedly mounted in the housing, and a varistor, a rectifier module, a filter, and an inverter module are mounted in sequence on the mounting pad; an air intake cavity is provided in the mounting pad; exhaust holes are provided between the air intake cavity and the top of the mounting pad; air inducing cavities are provided inside both sides of the housing; a through groove is provided between the air intake cavity and each air inducing cavity; and an air inlet is provided between each air inducing cavity and the outer wall of the housing. Natural heat dissipation is achieved within the variable frequency drive through multiple aspects, such as optimizing the design of an air duct, enhancing the heat conduction effect and heat conduction efficiency, and improving the internal environment. By means of a local heat-absorbing assembly, when localized overheating occurs within the variable frequency drive, heat generated by an automatic local component can be rapidly absorbed, thereby providing effective protection for the internal structure.

The invention relates to the technical field of general control systems, in particular to a water chilling unit energy-saving control method and system.The method comprises the steps that the machining process of a numerical control machine tool is equally divided into a plurality of monitoring time periods, and the demand degree of a water chilling unit in the machining process of the numerical control machine tool in the monitoring time periods is determined to screen out a target monitoring time period; energy consumption of the water chilling unit in the target monitoring time period is determined in combination with the time interval from the moment after the cutting temperature rises to the moment when the rotating speed of the compressor changes, and then the cooling effect of the water chilling unit in the target monitoring time period is determined in combination with rising changes of the cutting temperature and the environment temperature. And determining a regulation and control coefficient of the variable frequency driving control system in the target monitoring time period, and regulating and controlling the running speed of a compressor of the water chilling unit. The regulation and control coefficient for energy-saving control of the water chilling unit in the frequency conversion control system is obtained, and the operation speed of the compressor of the water chilling unit is regulated and controlled, so that the purpose of energy-saving control of the water chilling unit is achieved.

The invention discloses an intelligent variable-frequency tensioning device and a control method. The intelligent variable-frequency tensioning device comprises six units including a multi-modal data sensing and interaction integration unit and a self-adaptive variable-frequency driving execution regulation and control unit. The multi-modal data sensing and interaction integration unit collects tension, displacement and speed signals of operation of the tensioning device, the hierarchical parameter optimization processing center performs feature extraction and primary processing on data, and the intelligent algorithm collaborative decision module fuses an optimized PID control algorithm and an RBF neural network model to generate a control strategy. A motor is driven by the self-adaptive variable frequency driving execution regulation and control unit, the mechanical structure dynamic adjustment linkage unit is driven to adjust a tensioning part, and the state monitoring and feedback correction unit monitors in real time and feeds back data for strategy and parameter correction. According to the device and method, intelligent frequency conversion control of the tensioning device is achieved, control precision and system stability are effectively improved, and complex working condition requirements are met.

A system has an axial field rotary energy device with a housing, an axis and a rotor with a shaft, bearings, rotor disks and permanent magnets. A printed circuit board (PCB) stator is between the rotor disks to define an air gap on each side thereof. A variable frequency drive (VFD) assembly has a VFD housing and first pads coupled to inductors to facilitate heat removal from the inductors. A concave cradle is coupled to a ferromagnetic core and has a same contour as an outer surface of the ferromagnetic core. A second pad is coupled to a rectifier module. A third pad is coupled to switching devices and has pins to align the switching devices with the third pad. Standoffs are coupled to the VFD housing to support a first printed circuit board assembly (PCBA). A second PCBA is mounted to a shield plate above the first PCBA.

The invention provides a multi-motor control method and device based on droop control, and the method enables a droop control mode, namely a distributed power balance mode, to be applied to coal mine multi-point drive belt conveyor equipment, and overcomes the defects of an existing master-slave control mode. Feedback of the actual torque measured value is referenced in the rotational speed control reference value, so that the rotational speed control reference value can reflect information of the actual torque current. When the variable-frequency driving load is too heavy, namely the torque is too large, the rotating speed control reference value can be adjusted through the rotating speed droop feedback channel, so that the torque control reference value is changed, and the purpose that the frequency converter controls power balance among the driving motors is achieved.

The invention discloses a preparation method of a distributed power generation variable frequency driving cable, and belongs to the technical field of power cables. The prepared cable is composed of a cable core, a filling material, a metal shielding layer, an aluminum-plastic composite layer and an outer sheath layer. Wherein the outer sheath layer is prepared from the following raw materials in parts by weight: 70-90 parts of polypropylene resin, 22-30 parts of ethylene-vinyl acetate copolymer, 15-25 parts of modified magnesium hydroxide and 4-6 parts of lubricant. Polypropylene is used as a matrix, so that the cable is endowed with excellent mechanical property and electrical insulation property; wherein the ethylene-vinyl acetate copolymer can enhance the anti-aging performance of the cable; wherein the modified magnesium hydroxide has good compatibility with a polypropylene matrix, can greatly enhance the flame retardance, smoke suppression, aging resistance and rat-proof performance of the cable, and is stable in performance; therefore, the prepared cable is good in mechanical property, has stable and efficient flame retardance, smoke suppression, aging resistance and rat-proof performance, and has important application value in the technical field of power cables.

The invention relates to the technical field of automatic packaging equipment, and discloses a cooperative control system for a filling electric cylinder and an adjustable stirring cylinder. The system comprises a filling electric cylinder module, a weighing measurement module, an adjustable stirring cylinder module and a cooperative controller module. The filling electric cylinder module executes the filling action and feeds back the position speed; the weighing measurement module collects the material weight of the container in real time and converts the material weight into liquid level height; the adjustable stirring cylinder module stirs materials through variable frequency driving and replaceable paddles; and the cooperative controller module receives real-time data of each module and SPC historical data, analyzes and generates a cooperative control instruction, and dynamically optimizes filling and stirring parameters. By means of modular integration and data closed-loop control, high-precision and self-adaptive filling is achieved, the problems that traditional equipment is difficult to adjust, insufficient in precision, poor in material adaptability and lack of intelligent feedback are solved, and the high-precision self-adaptive filling device is suitable for occasions with high requirements for filling precision and flexibility in the industries of food, medicine and the like.

The invention belongs to the technical field of water pumps, and particularly relates to a variable-frequency submersible pump water shortage detection method which comprises the following steps: S1, initializing a single chip microcomputer, and setting no-load power PS and a temperature change threshold TS; s2, processing water pump driving and other functional processes; s3, the temperature Ti, the voltage Ui and the current Ii are detected regularly; s4, the operation power Pi of the water pump is calculated according to the formula Pi = UiIi; s5, if the number of times that the water pump operation power Pi is smaller than the no-load power PS exceeds 50% within the continuous preset time, the step S8 is executed; otherwise, executing the step S6; s6, the temperature difference value delta Ti between the current temperature Ti and the previous temperature Ti-1 is calculated; s7, if the temperature difference values delta Ti of continuous preset times are all larger than the temperature change threshold TS, the step S8 is executed; otherwise, executing the step S2; and S8, setting a water shortage mark, stopping driving of the water pump, and returning to the step S2. Damage caused by the fact that the water level only submerges the pump body but the motor and the variable frequency driving plate are exposed in the air can be effectively avoided.

Example embodiments are directed to a building management system tailored for structures equipped with a network of electric vehicle (EV) chargers. The system integrates various components, including a host interface, HVAC systems with heat pumps and variable frequency drives (VFDs), a network of EV chargers featuring bi-directional charging capabilities, and a building management platform. Load-balancing software within panel metering devices ensures efficient energy distribution to the EV charging units. An artificial intelligence (AI) algorithm optimizes charging schedules based on historical usage data, minimizing energy consumption during peak hours. The system dynamically adjusts power allocation to EV chargers based on HVAC system demand, promoting efficient energy utilization. Real-time monitoring and analysis capabilities enhance energy management, with alerts notifying building managers of potential anomalies.

A method includes receiving, by a processing device and from a variable frequency drive coupled to one or more compressors, operation information of the one or more compressors. The method also includes comparing the operation information of the one or more compressors to an operation threshold and determining that the operation information satisfies the operation threshold. The method also includes changing, based on the determination that the operation information of the one or more compressors satisfies the operation threshold, an operation parameter of a component of the refrigeration system. Changing the operation parameter increases at least one of: (i) a velocity of a working fluid in a piping assembly fluidly coupled to the one or more compressors, or (ii) a flow rate of an oil in the piping assembly flowing into the one or more compressors.

The utility model discloses a sieve-free reverse belt type sand making slurry gravity grading dehydration device which comprises an annular conveying trough belt, skirt edges are vertically arranged on the two sides of the outer surface of the conveying trough belt respectively, a driving roller and a variable frequency driving motor are arranged at the starting end of the conveying trough belt, and a redirection tail roller is arranged at the tail end of the conveying trough belt. The driving roller and the redirection tail roller are rotationally arranged on the integral support, the integral support is provided with an upper carrier roller set and a lower carrier roller set which are used for supporting the inner side of the conveying trough belt, and the integral support makes contact with the ground through a plurality of sets of lifting adjustable support legs; according to the utility model, by utilizing the principle that particulate matters can be precipitated in sewage under the influence of gravity and flow velocity, the sewage passes through the groove-shaped structure with a certain gradient, so that the particles in the sewage are precipitated under the action of gravity to form a deposition layer, and then are output in a countercurrent manner, so that the efficient recovery of fine particles and superfine particles is realized; the technical problem that materials with the aperture smaller than that of screen holes of screening equipment are difficult to recycle is solved.

The invention discloses a voltage distribution and insulation weak point prediction method based on a flat wire winding of a variable frequency motor, and belongs to the technical field of motor design and insulation evaluation. The method comprehensively considers the geometrical shape, the insulation structure, the working voltage and the like of a motor stator, establishes a complete finite element model of a flat wire winding motor, and improves the reliability of the motor. According to the method, distribution parameters such as capacitance, inductance and resistance of a cable and a motor winding are extracted, a winding 'I-type high-frequency equivalent circuit model is built, field-circuit coupling electromagnetic analysis is carried out by utilizing finite element simulation software, the process can be automatically realized through a compiled program, and a user only needs to provide an original motor model and working parameters, so that the method is simple and easy to implement. According to the method, the voltage distribution of the flat wire type motor winding under variable frequency driving can be efficiently and accurately predicted, the radar map capable of visually displaying the insulation weak point is generated, a new thought is provided for positioning the insulation weak point of the motor, the motor design is guided and optimized, and the evaluation efficiency and accuracy of the insulation performance of the motor are improved.

A heat dissipation control system, a heat dissipation method, and an immersion liquid cooling system are provided. The heat dissipation control system includes a radiator, a circulation pump, a fan, dry coolers, a temperature sensor, a first and a second variable-frequency drivers, and a heat dissipation controller. The temperature sensor is used for collecting a secondary-side liquid supply temperature. The heat dissipation controller is used for generating a control signal for the first and the second variable-frequency drivers based on a difference value between the secondary-side liquid supply temperature and a preset temperature. The first variable-frequency driver is used for controlling a frequency of the circulation pump so as to adjust a flow rate of a coolant flowing into the radiator. The second variable-frequency driver is used for activating or deactivating at least one of the dry coolers, and controlling a frequency of the fan.

The invention discloses a safe and energy-saving power utilization system of an air compression station driven by an air floating shaft, and relates to the technical field of air compression stations, operating parameters of all equipment in the air compression station are monitored in real time through a data acquisition module, the operating state of an air compressor can be adjusted through a variable frequency driving module according to the real-time air utilization requirement, unnecessary energy consumption is avoided, and the power utilization efficiency of the air compression station is improved. The pressure of a pipe network is monitored through a pressure sensor, the output air pressure of an air compressor is controlled within the optimal range, and energy waste caused by too high pressure is avoided; waste heat generated in the operation process of the air compressor is recycled through the energy recycling module, and the energy requirements of other links are reduced; when the multiple air compressors operate through the linkage control module, the system automatically distributes loads, it is ensured that each device operates in an efficient interval, and the loads are balanced; a protection mechanism is automatically triggered through the safety protection module under an abnormal condition, so that the safety of equipment and personnel is effectively ensured; and the control strategy of the control center ensures that the air compression station equipment is always kept stable in the operation process.

A variable-frequency drive includes a rectifier, a filter, an inverter, a capacitor bank, and control circuitry. The rectifier converts AC power from a power source to DC power on a DC bus for filtering by the filter. The inverter converts the DC power to three-phase AC power for output to the electric motor. The capacitor bank has one or more capacitors connected to the DC bus. The capacitor bank can store regenerative power on the DC bus from the inverter and can supply the stored DC power to the DC bus for conversion to the three-phase AC power to drive the electric motor. The control circuitry pre-charges the capacitor bank from the AC power of the power source. The control circuitry monitors one or more parameters of the variable-frequency drive and detects one or more fault conditions associated with the one or more monitored parameters.

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 discloses a variable frequency heat pump unit and a heat dissipation control method.The variable frequency heat pump unit comprises a refrigerant circulation loop and a variable frequency driving module, the refrigerant circulation loop is formed by connecting a compressor, a heat exchanger combination, a liquid storage device and a gas-liquid separator, and the variable frequency driving module is provided with a heat dissipation pipeline; the outlet end of the heat dissipation pipeline is connected to the air suction side of the compressor, the inlet end of the heat dissipation pipeline communicates with a liquid storage cavity of the liquid storage device through a first branch and a second branch, the first branch is provided with a cooling pipe section located in the gas-liquid separator, a first throttling device is installed on the outlet side of the cooling pipe section, and the second branch is located outside the gas-liquid separator. The second branch is provided with a second throttling device; the first throttling device and the second throttling device are adjustable in opening degree and work cooperatively. The liquid refrigerant in the liquid storage device is led out to dissipate heat of the variable frequency driving module, the influence of heat dissipation on main path circulation is reduced, and the heat dissipation efficiency and the unit performance can be both considered.

The invention provides a bearing fault diagnosis method based on ISCV-VIT, and the method comprises the steps: firstly collecting a current signal when a variable frequency driver of a motor needs to operate according to the variable frequency driver, and processing the collected current signal through an ISCV method; the input current is diagnosed according to the visual converter model; the method comprises the following steps: firstly, carrying out data segmentation on a time domain signal processed by ISCV, then adding the data into an image patch sequence in a linear mode through a trained linear projection layer and position embedding, then inputting a new image color block sequence into a converter encoder, and splitting the input into a plurality of heads by a multi-head attention layer; the outputs of all the magnetic heads are connected and transmitted through the MLP magnetic head, and finally, the output initial diagnosis result is subjected to a soft voting method to obtain a final diagnosis result.

A method and system are disclosed for providing electrical power from a utility electric grid to a fracturing operation, and an electrically powered fracturing system. A mobile substation includes at least two transformer units that are operatively coupled to the utility electric grid in a parallel orientation, wherein the transformer units are capable of accessing power from the utility electric grid and stepping down the power for delivery to a switchgear. An electric motor is operatively coupled to a hydraulic fracturing pump and operatively controlled by a variable frequency drive. At least one open air relay cable is operatively coupled between the switchgear and the electric motor and capable of delivering power to the electric motor.

The invention provides an evaporator defrosting judgment method and a frequency conversion refrigerator, and the method comprises the steps that frequency conversion driving is detected to output current change information, and the current change information is obtained through compressor load change; a reference current value is obtained, the current deviation rate is calculated, the reference current value is determined based on the environment temperature and the rotating speed of the compressor, and the current deviation rate is calculated through the reference current value and the current change information; if the current deviation ratio is larger than a current deviation threshold value, a defrosting instruction is output, and the defrosting instruction is used for triggering a defrosting condition. According to the method, the output current is collected in real time through variable frequency driving, the frosting condition of the evaporator can be detected in real time through the change of the output current, the influence of the humidity of articles stored by a user, the number of the articles, the door opening time and other conditions is avoided, the frosting condition of the evaporator can be reflected, and the problem that defrosting judgment through a defrosting judgment mechanism is inaccurate is solved.

An alternating current (AC) propulsion system for a boat. The AC propulsion system includes a trolling motor operably mountable to the boat and an AC power system. The trolling motor has a head and a motor housing secured at upper and lower ends, respectively, to an elongated shaft. An AC motor is disposed in the motor housing and drives a propeller. The AC power system includes a generator and a variable frequency drive (VFD). The VFD includes a VFD AC input and a VFD AC output. The VFD AC input is electrically coupled to an AC output of the generator. The VFD AC output is operably electrically coupled to the AC motor of the trolling motor. In some embodiments a second trolling motor with an AC motor may be electrically coupled to a second VFD AC output of the VFD.

A monitoring device is for monitoring winding insulation condition of an electric motor, motor phases of which are connected to a variable frequency drive. The monitoring device is configured to determine whether the variable frequency drive is in a standby mode based on a signal received or obtained from the variable frequency drive, and to measure a standby voltage between at least one of the motor phases and the frame of the motor while the variable frequency drive is determined to be in the standby mode. The standby voltage is indicative of the winding insulation condition. A system includes a monitoring device and a variable frequency drive, and a method is for monitoring the winding insulation condition of a motor.