30results about How to "Realize frequency conversion speed regulation" patented technology

The invention relates to a half bridge inverter for dragging a plurality of motors with asynchronism and realizing the rotor frequency control system, comprising a motor group, a rectifier group, a current limiter group, a chopper group, an isolator group, a current limiting smoothing device, a power capacitor, a half bridge inverter, a speed feedback apparatus, a current feedback apparatus, an excitation transformer, an excitation contactor, a control contactor, a switching contactor, a driver, a microprocessor, a A/D convertor and a signal processer, which adopts an invert control theory, the CPU technology and a three phasezero line circuit, works orderly through the PWM signal control chopper output by the driver, further dragging a plurality of motors for real-time online control, realizes the operation of the crane, the fan or the water pump, characterized by simple circuit, small volume, good performance price ratio, high reliability, energy saving and safe operation and the like.

The invention relates to a frequency conversion air conditioner for new energy passenger car. A frequency conversion compressor is arranged at the middle part of an air conditioner, the two sides of the compressor are provided with a control unit and a power system; a condensation component is arranged at the front end of the air conditioner, the middle part is a condensation fan, and condensers are arranged at the two side in an inversed V shape; an evaporation component is arranged at the rear end of the air conditioner, the middle part is a return air inlet, the two sides are provided with an evaporation fan, and an evaporator is arranged between the evaporation fan and the return air inlet; the front end of the frequency conversion compressor is communicated with a four-way change valve by virtue of a check valve, the rear end is communicated with the four-way change valve by virtue of a gas-liquid separator, the four-way change valve is respectively connected with the condenser and the evaporator, and the condenser is connected with the evaporator by virtue of a drier and a bidirectional expansion valve; all pipelines are connected by adopting a welding way, all the electric components are connected and arranged in an overhead type structure, and only a power supply is externally connected with a control cable. The invention has the advantages that structure is compact, occupying space is small, and energy consumption is low, thus being applicable to new energy passenger car.

The present invention discloses one kind of integrated power platform for mixed power vehicle, and belongs to the field of energy management technology for mixed power vehicle. The optimally designed integrated power platform consists of one chopper, three inverters, one power electronic switch, power consumption braking switch, one power consumption braking resistor, one integral rectifying and inversing device and one DC bus. The integrated power platform has high power efficiency, good heat dissipating effect and light weight, and is favorable to space arrangement and power source cooling in vehicle.

The invention provides a multi-pump multi-frequency-conversion emulsion pump station system for mining. The multi-pump multi-frequency-conversion emulsion pump station system for mining comprises 400 KW frequency conversion control cabinet, a 110KW frequency conversion control cabinet, four 400 L/min emulsion pumps and a 80 L/min emulsion pump. One end of the 400 KW frequency conversion control cabinet is connected with the 110 KW frequency conversion control cabinet, and the other end of the 400 KW frequency conversion control cabinet is connected with the four 400 L/min emulsion pumps. The 110KW frequency conversion control cabinet is further connected with the 80 L/min emulsion pump. The multi-pump multi-frequency-conversion emulsion pump station for mining adopts the multi-pump multi-frequency-conversion drive manner, the four emulsion pumps with the rated flow of 400 L/min and the emulsion pump with the rated flow of 80 L/min are arranged, each pump can achieve frequency conversion speed control and electronic control loading and unloading, the emulsion supply flow adjustment range can reach 0-1680L/min, and the highest adjustment precision can reach 1.6 L/min; on the basis of the multi-pump multi-frequency-conversion emulsion pump station system for mining, a rated emulsion supply control method is provided. According to the rated emulsion supply control method, through PLC programming in the control cabinet, the multiple pumps are controlled to operate at the industrial frequency, multi-frequency-conversion speed adjustment is controlled, accurate and quantitative control over high-pressure emulsion flow is achieved, and a reliable underlying control basis is provided for further intelligent emulsion supply.

A control system applied to a brick machine, including an MPI bus and a main control module and a control panel connected to the MPI bus, and also includes a variable vibration module for controlling a vibration device, an anti-jamming module for receiving action feedback signals, and The output surge module used to issue action commands, the variable vibration module, the anti-interference module and the output surge module are respectively connected to the main control module. The variable vibration module includes a power supply, two motors, a frequency converter, and is connected between the power supply and the frequency converter. A contactor, a braking unit electrically connected to the frequency converter, two air switches and two air switch contacts, the two air switches are respectively connected between the frequency converter and the two motors, and the two air switch contacts are connected in series and connected to the frequency converter. The main control module is used for program control, and the anti-jamming module and output surge module are used for signal transmission control with each part of the brick machine, which can realize the automatic production control of the brick machine; the variable vibration module has a soft start function, which can realize the two motors. Synchronous work.

The invention discloses a high-speed railway air conditioner air volume adjusting method and system based on the passenger number and distribution. The method comprises the steps of firstly, acquiringimage data in a compartment in real time through a safety camera, and processing the image data by a vehicle-mounted computer to obtain real-time air volume data needed in the compartment; then calculating a fan power supply frequency analog signal by a vehicle-mounted PLC according to the air volume data in combination with the characteristics of a ventilator and a condensate fan in the compartment; and finally, receiving the fan power supply frequency analog signal by arranging frequency converters for the ventilator and the condensate fan, and conducting frequency control on the fan. The rotating speed of the fan can be correspondingly adjusted according to the actual situation of the number of people in the compartment so as to achieve the purpose of air volume adjustment. Meanwhile,the fan works in a variable-frequency control mode, so that energy waste can be reduced, and the energy utilization rate is increased.

The invention discloses a frequency conversion speed regulation control device of a scraper conveyer, belongs to the technical field of frequency conversion speed regulation control of the scraper conveyer, and aims to solve the technical problem of providing the frequency conversion speed regulation control device which can regulate the running speed of the scraper conveyer in a self-adaptive manner according to the load condition. According to the technical scheme for solving the technical problem, the frequency conversion speed regulation control device comprises a mining explosion suppression and ntrinsically-safe type control box, wherein a central controller and a data communication module are arranged in the mining explosion suppression and ntrinsically-safe type control box; the central controller is connected with the data communication module through a wire; the signal input end of the data communication module is connected with a coal position sensor; the data communicationmodule is in both-way connection with a frequency converter through industrial communication cables; the frequency converter comprises a handpiece frequency converter and a tail frequency converter; the handpiece frequency converter is connected with a handpiece motor; and the tail frequency converter is connected with a tail motor. The frequency conversion speed regulation control device is applicable to scraper conveyers.

The invention discloses a variable frequency controller for an alternating current motor. The variable frequency controller comprises a control power module, an interface module, a processing module, a driving module and a power module, wherein the control power module is used for providing control power for the processing module and the driving module, the interface module is used for receiving control signals input from the exterior, the processing module is used for carrying out operation processing on the control signals received by the interface module from the exterior to output three-phase voltage control signals, the driving module is used for carrying out conversion processing on the three-phase voltage control signals output by the processing module to output three-phase rectangular pulse driving control signals, and the power module is used for carrying out power amplification on the three-phase rectangular pulse driving control signals output by the driving module and outputting three-phase alternating current power with the variable voltage/frequency to control the alternating current motor to run. By means of the variable frequency controller for the alternating current motor, the motor can be started under the rated current, and the current is smooth and free of impacts.

The invention relates to a variable frequency speed regulating method for multiple water injection pumps in an oilfield water injection station, and the variable frequency speed regulation of multiple water injection pumps is uniformly completed by a variable frequency speed regulating system. The variable frequency speed regulating system is composed of a coiling type motor and a rotor variable frequency control system; the rotor variable frequency control system comprises a rectifier, a direct current chopper and an inverter; the rectifier is connected with a rotor winding of the coiling type motor; the rectifier is orderly connected with the direct current chopper and the inverter in series, a slip power is fed back to a power grid by the inverter; when a plurality of coiling type motors are provided, the rotor winding of every coiling type motor is connected with the rectifier and the direct current chopper orderly in series and then connected with the same one inverter; the slip powers of the plurality of motors are fed back to the power grid through the inverter; a trigger angle beta of the inverter is adjusted to the minimum angle and keeps constant, so that the high-efficient feedback of the slip power and the regeneration energy is achieved; according to the rotor variable frequency speed regulating method provided by the invention, the energy consumption of the water injection pumps can be reduced by more than 15%.

The invention relates to a rapidly-lifting garage door. The problems that an existing garage door is large in installation space, high in noise and low in lifting speed are mainly solved. According to the technical scheme, the rapidly-lifting garage door comprises a door frame, a door top beam, an upper door piece, a middle door piece, a lower door piece and a power transmission system, and the two sides of the door frame are provided with three door piece guide rails side by side, wherein the door piece guide rails allow the upper door piece, the middle door piece and the lower door piece to move up and down; the power transmission system comprises an electromotor, a counter-weight, a traction wheel in power connection with the electromotor, first traction ropes, second traction ropes, guide wheels, steering movable pulleys, a linkage guide wheel and a linkage chain, and the first traction ropes and the second traction ropes drive the middle door piece and the upper door piece correspondingly; the linkage guide wheel is installed at the top of the middle door piece; and one end of the linkage chain is fixed to the lower door piece, and the other end of the linkage chain winds around the linkage guide wheel to be fixed to the lower end of the upper door piece. The rapidly-lifting garage door has the advantages of being small in installation space, low in noise and high in speed.

The invention relates to a PWM variable frequency speed control system based on the control of a DSP, and belongs to the technical field of intelligent electrical engineering and electric apparatuses. A motor and an inverter are seen as a whole. A space voltage vector analytical method is adopted for conducting flux linkage and torque calculation on a stator coordinate system, and the torque is directly controlled through a selection of different on-off states of the inverter. Direct torque control is adopted in a control method, and is another novel efficient variable frequency speed control technology after the vector control technology. The direct torque control technology is adopted in the stator coordinate system for calculating the flux linkage and the torque of the motor. Firstly, a dibit controller is adopted, two control signals are directly utilized in the PWM inverter to generate output voltage, and rotation transformation and current control are eliminated, so that the structure of the controller is simplified. Secondly, the stator flux linkage is selected as a controlled variable, so that the model calculating the flux linkage cannot be affected by rotor change, and robustness of the system is improved. Moreover, due to the fact that direct torque control is adopted, rapid torque response can be acquired in the speed-up, speed-down and load change dynamic processes, and variable frequency speed control can be simply and effectively conducted.

The invention relates to a heading machine control and protection technology and especially relates to a heading machine control and protection device. By using a current heading machine control and protection technology, reliability of the control and protection is poor. By using the device of the invention, the above problem is solved. The heading machine control and protection device comprises a digital quantity input plate, a digital quantity output plate, an analog quantity input plate, a DSP control panel, a first power plate, a second power plate and a mother board. The mother board comprises a power supply bus and a CAN bus. A power supply input terminal of the digital quantity input plate, a power supply input terminal of the digital quantity output plate, a power supply input terminal of the analog quantity input plate, a power supply input terminal of the DSP control panel and a power supply output terminal of the first power plate are connected with the power supply bus. A signal transmission terminal of the digital quantity input plate, a signal transmission terminal of the digital quantity output plate, a signal transmission terminal of the analog quantity input plate and a signal transmission terminal of the DSP control panel are connected with the CAN bus. The device of the invention is suitable for the control and protection of the heading machine.

The present invention provides a three-leg inverter-driven motor system as well as a three-leg inverter-driven motor system-based phase sequence detection method and device. The system comprises a three-leg inverter and a two-phase asymmetrical motor; the two-phase asymmetrical motor comprises a main winding and an auxiliary winding; the first output end of the three-leg inverter is connected with the first end of the two-phase asymmetrical motor; the first output end of the three-leg inverter is electrically connected with the emitter of a first power switch tube and the collector of a second power switch tube; the second output end of the three-leg inverter is connected with the second end of the two-phase asymmetrical motor; the second output end of the three-leg inverter is connected with the emitter of a third power switch tube and the collector of a fourth power switch tube; the third output end of the three-leg inverter is connected with the third end of the two-phase asymmetrical motor; and the third output end of the three-leg inverter is connected with the emitter of a fifth power switch tube and the collector of a sixth power switch tube. The service life of the system can be prolonged, and the reliability of the system can be improved.

The invention discloses a three-phase four-switch direct-current brushless motor space voltage vector control circuit and method.The control circuit comprises an inverter circuit, a direct-current bus circuit and a three-phase direct-current brushless motor, the inverter circuit comprises four insulated gate bipolar transistors, the direct-current bus circuit comprises two capacitors, and the three-phase direct-current brushless motor is connected with the three-phase four-switch direct-current brushless motor. The inverter circuit is respectively connected with a power supply and a load, an output end of the direct-current power supply is connected with the direct-current bus circuit, an output end of the inverter circuit is connected with two phases of the three-phase direct-current brushless motor, and a neutral point of a capacitor in the direct-current bus circuit is connected with a third phase of the motor. For inverter output, only four-switch variable frequency speed regulation is needed, the number of used main switch devices is one third smaller than that of a traditional variable frequency circuit, voltage regulation and variable frequency speed regulation are achieved at the same time, and torque pulsation of the motor can be well restrained.

The invention discloses a screw feeding device directly driven by a frameless combination type permanent magnet synchronous linear motor. The screw feeding device comprises a rack, a feeding cavity mounted on the rack, a screw shaft, a bearing, a screw blade mounted on the screw shaft and the frameless combination type permanent magnet synchronous linear motor, wherein the frameless combination type permanent magnet synchronous linear motor comprises a stator assembly and a rotor assembly; the stator assembly is fixedly mounted on the rack and provides a rotating magnetic field for the rotor assembly; the rotor assembly with permanent magnetic property is fixedly mounted on the screw shaft, and the stator assembly is of a completely or incompletely round structure and comprises a pluralityof stator units with sector structure; each stator unit is an independent control mechanism and comprises a stator core and a stator winding which winds around the stator core. The screw feeding device adopts the frameless combination type permanent magnet synchronous linear motor to drive the screw shaft to rotate and has the advantages of high transmission efficiency, low noise and large torque.

The invention discloses a screw feeding device directly driven by a frameless type permanent magnet synchronous motor. The screw feeding device directly driven by the frameless type permanent magnet synchronous motor comprises a rack, a feeding cavity, a screw shaft, a bearing, spiral blades and the frameless type permanent magnet synchronous motor, wherein the rack is provided with the feeding cavity, the screw shaft and the bearing, and the spiral blades are installed on the screw shaft; the frameless type permanent magnet synchronous motor comprises a stator assembly and a rotor assembly; the stator assembly is fixedly installed on the rack, and provides a rotating magnetic filed for the rotor assembly; the rotor assembly with the permanent magnet characteristic is fixedly installed onthe screw shaft; the stator assembly comprises a stator iron core and a stator winding wound on the stator iron core; the stator iron core is integrally machined and formed or is an annular column oran annular disk formed by splicing a plurality of sector-shaped blocks. According to the screw feeding device directly driven by the frameless type permanent magnet synchronous motor, the screw shaftis driven by the frameless type permanent magnet synchronous motor to rotate, and the beneficial effects that the transmission efficiency is high, noise is low and torque is large are achieved.