36results about How to "No harmonic interference" patented technology

The invention discloses a temperature uniformity control system for a multi-temperature zone of a large-plate vacuum annealing furnace and a control method thereof. The control system comprises a plurality of temperature controllers, a plurality of power regulators, a uniform temperature data logging device and an upper computer monitoring system, wherein the upper computer monitoring system is used for analyzing detection signals of the uniform temperature data logging device and monitoring the working process of each temperature controller and each power regulator. The control method comprises the following steps of: (1) initiating data; (2) working out the absolute value of the temperature difference e(n) and the absolute value of the temperature difference change rate ec(n); (3) setting control parameters required to be used by a PID (Proportion Integration Differentiation) controller on line by using a fuzzy reasoning method; (4) automatically setting the PID parameters; (5) controlling the heating of the vacuum annealing furnace; (6) detecting the temperature uniformity of the multi-temperature zone; and (7) analyzing and locally adjusting the temperature uniformity of the multi-temperature zone. The control system has the advantages of high temperature control accuracy, good temperature uniformity, high reliability and good adaptivity and robustness, the production process requirements of the rare metal vacuum annealing furnace can be well satisfied, and the control system is convenient for popularization and application.

The disclosed apparatus for controlling quality of power supply includes winding type rotor induction motor, AC field power supply, AC chopper, and transformer. Stator of the winding type rotor induction motor includes two sets of symmetry windings in three phases: one set is parallel winding, and the other set is series compensating winding (SCW). One end of SCW is connected to the input end of the AC chopper, and the output end of the AC chopper is connected to primary side of transform. Through slip ring and brush, rotor winding is connected to the output end of the AC field power supply. Comparing with current technique of using power semiconductor device, the invention uses winding type rotor induction motor, providing advantages of reducing cost, raised reliability, simple structure, easy of integration, and preventing harmonic interference.

The invention discloses a stacked type permanent magnet speed controller. A magnetism transmission piece and a magnetism sensing component which are of a concave-convex multi-ring shell structure are arranged on a magnetic transmission device of a driving rotor shaft and a driven rotor shaft which are arranged on the stacked type permanent magnet speed controller respectively, a convex ring portion of the magnetism transmission piece and a convex ring portion of the magnetism sensing component are inserted into a concave ring portion of the magnetism transmission piece and a concave ring portion of the magnetism sensing component respectively, and air gaps are arranged between the convex ring circumference surface of the magnetism transmission piece and the convex ring circumference surface of the magnetism sensing component to separate the convex ring circumference surface of the magnetism transmission piece and the convex ring circumference surface of the magnetism sensing component. Magnetizers made of soft iron and at least two permanent magnets are arranged on the convex ring shell circumference surface of the magnetism transmission piece, the permanent magnets are isolated through soft iron, and the magnetic line of force of the permanent magnets is perpendicular to a rotor axis. The convex ring shell circumference surface of the magnetism sensing component is composed of soft iron materials and copper bars, wherein the copper bars are arranged on the soft iron and are evenly and fixedly arranged on the circumference surfaces of the soft iron, and the section of each copper bar is rectangular. The stacked type permanent magnet speed controller can transmit large torque, and has the advantages of being high in response speed, small in motion vibration and capable of controlling speed in a stepless mode.

The invention provides a motor overexcitation halting method by frequency changer control. Halting is performed by motor overexcitation, when a motor halts, if the motor enters a power generating state due to large rotor inertia, exciting current of a stator is increased by a frequency changer so that motor overexcitation occurs, extra electric energy is converted into heat energy to be consumed, the motor can halt as soon as possible, and overvoltage or overcurrent faults can not be reported. The invention further provides a motor overexcitation halting device by frequency changer control.

The invention provides a variable-frequency resonance high-voltage adjustable power supply for converting three-phase alternating current into variable-frequency resonance high voltage. The variable-frequency resonance high-voltage adjustable power supply comprises a filter circuit, a rectifying circuit, a PWM (Pulse-Width Modulation) variable-frequency circuit, an isolating excitation circuit and a resonance modulation circuit, wherein the filter circuit, the rectifying circuit, the PWM variable-frequency circuit, the isolating excitation circuit and the resonance modulation circuit are sequentially connected. A method of converting a circuit working mode is adopted by the variable-frequency resonance high-voltage adjustable power supply, and a circuit which originally directly works in a high-voltage large-current capacitive load environment is converted to a current resonance modulation voltage-boosting resistive load working environment, so that the power supply capacity required by working is only 1 / Qth of a resonance quality factor, the voltage regulation is smooth, and a loop has no harmonic interference.

The invention relates to the field of heat-radiating furnaces, in particular to a closed-loop control civilian infrared heat-radiating electric furnace adopting a combination switch, and a control method thereof. The heat-radiating electric furnace comprises a temperature setting device, a microprocessor, the combination switch, a load and a temperature sensor. Comparing with the prior art, the heat-radiating electric furnace adopts a temperature negative feedback control technology, the power electronics heating problem is avoided, and the disadvantages of large fan energy consumption, short fan motion part service life and high noise generated from a fan due to the utilization of a cooling fan are avoided effectively; as a power electronic contactless switch and a relay contact switch in parallel connection with the combination switch are used for temperature control, the dual purposes of zero-crossing trigger and low conducting power consumption are realized, and higher harmonic pollution generated by a thyristor pressure regulating technology is avoided; therefore, the domestic heat-radiating electric furnace can perfectly realize the temperature closed-loop control without cooling fans, harmonic interference or load shock current.

The invention discloses a series topological light-emitting diode (LED) switching power circuit. The circuit comprises a power input end, an input filter, a series topological electrical energy converter, an isolated electrical energy output end and a power output end, which are sequentially connected in series to form a loop. The problems of low electrical energy conversion efficiency, short service life of an LED, non-constant peak points of set output current and voltage, circuit structure complexity, large size, high product cost and the like of the prior art are solved, and the circuit has the characteristics of simple structure, high electrical energy conversion efficiency, constant current and voltage peaks, small size of a high-power density product, and the like.

An intelligent power saver is an intelligent alternative product for a conventional street lamp power saving device in the market. The intelligent power saver is based on micro computer technology control, integrates an electromagnetic technology, an intelligent control technology and a data control technology into one body, and can be applied to such illumination occasions as a municipality, a square, a harbor, an enterprise and the like, for realizing stable power output and carrying out such functions as adjusting power and illumination, intelligent lamp switching, remote control, intelligent theft prevention and the like according to illumination requirements. By using the intelligent power saver, the running states of a street lamp can be inquired, detected and controlled real time through GPRS, GSM wireless networks, so that high-efficient and low-cost management is realized. The conventional control mode of municipal illumination is quite simple, illumination cannot be adjusted real time according to such situations as an illumination time period, an illumination demand, electrical network fluctuation and the like, the electric energy utilization rate is not yet 65%, and there is a severe waste of electric energy, therefore, there is great energy conservation space.

The invention belongs to the technical field of electric heating devices, and specifically relates to a nano-infrared electric heating ring; it includes a main body of the electric heating ring, and the main body of the electric heating ring includes a far-infrared coating, a heat conducting layer, a nano electric heating layer, a heat insulation layer and a shell from the inside to the outside. , the main body of the electric heating coil is cylindrical in shape; the nano-electric heating layer is spliced ​​by several nano-carbon fiber heating plates, and the nano-electric heating layer and the heat insulation layer are coated with high-temperature resistant and flame-retardant glass glue; the heat-conducting layer and the nano-electric heating layer There is a silver layer between them; the outer surface of the shell is covered with a radiation-proof coating; it can effectively save electric energy, avoid heat energy loss and waste, have no harmonic interference to other equipment in the grid, have a long service life, and are highly efficient and environmentally friendly.

The invention provides a constant torque load soft start permanent magnet speed regulation control method, and relates to the technical field of permanent magnet speed regulation. The method comprises the following steps: firstly, setting the soft starting time of a motor dragging a constant torque load, and calculating the average acceleration of the motor during soft starting; the permanent magnet speed regulation device is arranged at the maximum air gap position, so that the motor realizes no-load starting; starting the permanent magnet speed regulation device, reducing the air gap of the permanent magnet speed regulation device, and enabling the rotating speed of the output end of the permanent magnet speed regulation device to be greater than 0; calculating the output torque of the permanent magnet speed regulation device, the torque of the constant-torque load equipment and the output rotating speed acceleration of the permanent magnet speed regulation device; pID regulation is carried out, so that the real-time rotating speed acceleration output by the permanent magnet speed regulation device is equal to the average acceleration of the motor during soft starting; and finally, the air gap of the permanent magnet speed regulation device is adjusted, so that the motor reaches the rated rotating speed, and the motor dragging constant-torque load soft start is completed. According to the method, constant-torque load soft start can be ensured, and heavy-load impact on the motor caused by direct start and direct stop of equipment is relieved.

The transformer state monitoring and protecting integrated device based on the strain characteristics comprises a porous metal explosion-proof unit, an oil pressure starting unit, a strain monitoring unit, an alarm unit and a tripping unit, the oil pressure starting unit is connected with the strain monitoring unit, and the tripping unit, the alarm unit and the porous metal explosion-proof unit are all connected with the strain monitoring unit. According to the invention, the oil pressure starting unit and the strain monitoring unit are utilized to judge whether the internal insulation oil pressure characteristic quantity of the transformer and the strain characteristic quantity of the porous material reach the threshold value or not, so that the state change of the transformer can be quickly and reliably analyzed and evaluated, and the transformer fault can be discriminated and removed.

The invention is a rotary electromagnetic electric energy quality synthetic control device, belonging to the field of electric machine and power electronics technique, and it comprises winding rotator induction electric machines 1 and 2, inverters 1 and 2, rectifier, transformer and master controller, where the output end of the rectifier is connected with those of the inverters and the output end of the first inverter is connected with the rotator winding of the first winding rotor induction electric machine and the output end of the second inverter is connected with the rotator winding of the second induction electric machine, and the rotors of the two induction electric machines are fixed and coaxially rotate, the stator winding of the second induction electric machine is connected with the primary side of the transformer and the controlled ends of the two inverters and the rectifier are separately connected with the output ends of the master controller.

The invention discloses a transformer digital non-electric quantity protection device and method based on deflection characteristics. A displacement sensor is used for measuring the deflection characteristic quantity of a transformer oil tank; whether the deflection characteristic quantity is larger than or equal to a deflection starting threshold value or not is judged, if yes, whether the deflection sudden change characteristic quantity is larger than or equal to a deflection sudden change threshold value or not is judged, and if yes, whether the deflection characteristic quantity is larger than a deflection protection judgment threshold value or not is judged. If the deflection protection judgment unit judges that the real-time deflection characteristic quantity is larger than or equal to the deflection protection judgment threshold value, a deflection tripping signal is sent out through the tripping unit. When a fault occurs in the transformer, a tripping signal is sent out, so that subsequent oil tank breakage and explosion accidents are avoided, and the operation safety of the transformer is improved. The device can reliably run for a long time, is not interfered by strong electromagnetic interference, and has the advantages of high response speed and high measurement frequency.

The invention discloses an on-load tap-changer state monitoring device and method based on comprehensive characteristic quantity. The device comprises a porous pressure-bearing unit, a strain starting unit, an oil pressure starting unit, a deflection monitoring unit and an alarm unit, the porous pressure-bearing unit comprises layered honeycomb aluminum, the layered honeycomb aluminum comprises a first layer of honeycomb aluminum, a second layer of honeycomb aluminum and a panel, the first layer of honeycomb aluminum is in contact with the panel, the second layer of honeycomb aluminum is connected with the tap switch top cover, and the second layer of honeycomb aluminum is located between the first layer of honeycomb aluminum and the panel; the porous pressure-bearing unit is connected with the strain starting unit, the strain starting unit and the oil pressure starting unit are both connected with the deflection monitoring unit, and the deflection monitoring unit is connected with the alarm unit. According to the invention, the state of the on-load tap-changer is monitored, analyzed and evaluated, and the overall mechanical performance of the on-load tap-changer and the accuracy and reliability of state monitoring are improved. And the used sensor meets the complex environment of high temperature, oil stain and strong electromagnetism in the on-load tap-changer from both precision and application range.

The invention discloses a DC (direct current) feed type motor energy saving device and belongs to the field of motor drive application. The device comprises a motor controller with a DC bus, a bidirectional DC / DC converter, a super capacitor and a detection control circuit, wherein the AC (alternating current) input end of the motor controller is connected to a power grid AC bus; the output end of the motor controller is connected with the motor; the high-voltage end of the bidirectional DC / DC converter is connected with the DC bus of the motor controller; the low-voltage end of the bidirectional DC / DC converter is connected with the super capacitor; and the detection control circuit is connected with the DC bus of the motor controller, the power grid AC bus and the bidirectional DC / DC converter respectively. The device disclosed by the invention is simple and reasonable, can be used for realizing power saving, preventing harmonic interference on the power grid and guaranteeing the quality of the power grid, and is low in cost.

A white light light-emitting diode (LED) shadowless lamp relates to the technical field of medical equipment, in particular to the technical field of production of the shadowless lamp for operations. The white light LED shadowless lamp comprises a lamp base, wherein a plurality of groups of connection seats are arranged on the lamp base, and a group of whit light LED assemblies is respectively arranged in each connection seat. The white light LED shadowless lamp has the advantages of being long in service life, environment-friendly and low in energy consumption, and meets requirements of hospitals for integral environment-friendly lighting now days.

A high efficient direct line to-and-fro power machine developing magnet energy, replacing and saving electric energy takes the physical energy source stored in the magnet materials as the runner and uses a little conversion pulse current to make excitation for the stator to obtain direct line to-and-fro power much larger than electric energy. The machine applies pulse supply to increase power factor and shaft power and operates on either two-phase or three- phase.

The invention discloses an LED shadowless desk lamp for an operation. The LED shadowless desk lamp comprises a lampshade (1), a light transmitting cover (2), integrated LED units (3), an adjusting controller (4) for controlling the light intensity and light spots of the integrated LED units as well as a position adjusting bracket (5), wherein the lampshade (1) adopts a spherical surface; the number of the integrated LED units (3) is at least one and the integrated LED units (3) are downwards concaved to form spherical surfaces; the integrated LED units (3) are mounted at the top of the position adjusting bracket (5); the light intensity and light spot adjusting controller (4) is mounted on the position adjusting bracket (5) and is positioned below the LED units (3). The LED is used as a luminous body; no strobe appears, so eye fatigue does not easily caused, or harmonic interference to other devices in a working area is avoided; an LED shadowless cold light source uniformly irradiates by 180 degrees; the integrated LED units hardly generate the heat and are not easy to crack, so potential safety hazards are thoroughly eliminated.

The invention is a rotary electromagnetic electric energy quality synthetic control device, belonging to the field of electric machine and power electronics technique, and it comprises winding rotator induction electric machines 1 and 2, inverters 1 and 2, rectifier, transformer and master controller, where the output end of the rectifier is connected with those of the inverters and the output end of the first inverter is connected with the rotator winding of the first winding rotor induction electric machine and the output end of the second inverter is connected with the rotator winding of the second induction electric machine, and the rotors of the two induction electric machines are fixed and coaxially rotate, the stator winding of the second induction electric machine is connected with the primary side of the transformer and the controlled ends of the two inverters and the rectifier are separately connected with the output ends of the master controller.

The invention relates to an active power quality comprehensive adjusting device and a detection algorithm thereof. The active power quality comprehensive adjusting device comprises a cabinet body, a power unit, a protection plate, a circuit breaker unit, a secondary mounting plate unit, a direct-current capacitor unit, a fan, an L1 electric reactor, an L2 electric reactor, a filter capacitor and a contactor. The secondary mounting plate unit is supported and fixed through a secondary mounting plate which is made of metal materials, a vent window is arranged on the top of the cabinet body, ventilation louvers are arranged on the lower portion of the cabinet body, and inlet wire connecting devices are arranged on the upper portion and the lower portion of the back face of the cabinet body. The active power quality comprehensive adjusting device has the advantages that under system control, one device can be used for realizing functions of an SVG or an APF respectively, and can also be used for realizing functions of the SVG and the APF at the same time, namely function requirements of the SVG or the APF are considered at the same time from the aspects of hardware and software. By means of the device, dilatation can be achieved easily, the modularized design is used, power density is high, size is small, and connection busbar length is reduced.

The invention belongs to the technical field of adjustable resistors, and discloses a plug-and-play active adjustable reactor. The plug-and-play active adjustable reactor comprises a voltage detectionunit, a voltage generation unit and a magnetic flux compensation unit, wherein the voltage detection unit comprises a voltage transformer, the voltage generation unit comprises a transformer, the magnetic flux compensation unit is provided with a slim mutual inductor, an original input end of the magnetic flux compensation unit is connected in series between a power grid and a load, an input endof the voltage detection unit is connected in parallel between two ends of the original input end of the magnetic flux compensation unit, an output end of the voltage detection unit is connected withan input end of a gain circuit of the voltage generation unit, the gain circuit, a PWM modulation module, a voltage source inverter and an LC passive power filter are sequentially connected, and finally, an output is connected with a secondary input end of the magnetic flux compensation unit. The mutual inductor of the magnetic flux compensation unit is also designed in target way. By the plug-and-play active adjustable reactor, the obtained active adjustable reactor has the advantages of wide adjustment range, rapid response speed, no harmonic generation and favorable continuous stepless adjustability and is easy to control.

The invention discloses a voltage regulator specialized for low voltage control. A control unit comprises a digital signal processor, an input voltage mutual inductor, an output voltage mutual inductor and a relay driving unit. The input voltage mutual inductor, the output voltage mutual inductor and the relay driving unit are electrically connected with the digital signal processor. The relay driving unit is connected with a relay. An input terminal bar is connected with a power supply input cable, the input end of the input voltage mutual inductor, the incoming wire of the secondary coil of a ring transformer and the working power supply of the control unit. An output terminal bar is connected with a power supply output cable and the input end of the output voltage mutual inductor. The power supply input cable is connected with the ring transformer through the relay. The problem of low voltage control of a rural power grid can be effectively solved by the voltage regulator specialized for low voltage control.

The invention provides a novel permanent magnet electronic gearbox for an automobile. The novel permanent magnet electronic gearbox mainly comprises an engine, a motor shaft, a conductor rotor, a steel body, a copper conductor, a magnetic rotor, a permanent magnet and the like. The conventional physical transmission between a motor and a load is replaced by an air gap torque transmission mode. Theengine is controlled by an electronic control system, and the engine is connected with the magnetic rotor. A motor is not mechanically connected with a load shaft, and a load protection function is achieved. The most difficult problem that a motor is burnt due to overload or locked-rotor frequently occurring in the running process of the motor in a driving system is easily solved, and vibration and noise can be reduced. The device is of a pure mechanical structure, does not consume electricity, does not generate harmonic waves, electromagnetic interference or other pollution, and is a green and environment-friendly product. Buffer starting and multiple times of starting can be achieved.

The invention discloses compensation type voltage stabilization auxiliary power supply device for a partition post. The device comprises a main transformer connected with a high-voltage power transmission network; the low-voltage side of the main transformer is connected with compensation type voltage stabilization auxiliary power supply equipment; the compensation type voltage stabilization auxiliary power supply equipment comprises a compensation transformer; a secondary winding of the compensation transformer is connected with an output winding of the main transformer in series, and the twoends of a primary winding of the compensation transformer are connected with the output winding of the main transformer in parallel through four electronic switches; the input end of a detection andcontrol module is connected with the output end of the main transformer, and the output end of the detection and control module is connected with the electronic switches to control on-off of the electronic switches. Under the condition of not replacing an existing power transformer of the partition post, a small-power transformer is connected with the output end of the partition post, the voltageof the output end is detected, compensation voltage is connected through the electronic switches, the output voltage is stabilized within a certain range, and the power utilization requirement of theequipment is met.

The invention relates to an asynchronous motor controllable compensation type full-torque energy-saving soft start device. In the device, an air switch, a three-phase starting capacitor and the alternating-current input end of a three-phase rectifier bridge are connected in series and then are connected in parallel with leads of each phase of a controlled motor. A three-phase compensation capacitor is connected between a three-phase starting capacitor and a three-phase rectifier bridge in parallel, and the direct-current output end of the three-phase rectifier bridge, the power resistor, the collector electrode and the emitting electrode of a power transistor are sequentially connected in series. The control circuit is connected to the two ends of the three-phase rectifier bridge in parallel, and the signal output end of the control circuit is connected with the base electrode of the power transistor. Compared with the prior art, the device has the advantages that the starting currentis inhibited, and the starting torque is not reduced, the voltage fluctuation of a power grid can be effectively overcome, harmonic interference is avoided, the power factor of the motor is increasedto about 1, the line loss is reduced to the maximum extent.