66 results about "Motor capacitor" patented technology

The invention discloses audible noise measuring circuit and method of a power capacitor. The audible noise measuring method comprises the following steps of: selecting a noise-eliminating test area; mounting a power capacitor to be measured in the noise-eliminating test area; setting a power capacitor to be measured in accompany; building the power capacitor to be measured and the power capacitorto be measured in accompany into a bridge-type power capacitor loading circuit; respectively loading an external high-voltage alternating current power source and an external harmonic power source attwo ends of the bridge-type power capacitor loading circuit, wherein the whole bridge-type circuit achieves resonance state under the common action of power frequency voltage generated by the high-voltage alternating current power source and various time harmonic voltage generated by the harmonic power source; and obtaining various noise values generated by the power capacitor to be measured in an actual work state according to data which are measured by a noise sensor arranged around the power capacitor to be measured and are related to the noise. The invention reduces the random of the noise measuring operation of the power capacitor, so that a measuring result has more comparability and a set of noise measuring method of the power capacitor with systematicness, completeness, science and reasonability is formed.

An electronically commutated motor (ECM 20) has terminals (56, 62) for connection to a DC power source (63). It has a permanent-magnet rotor (22), also a first and a second series circuit (40, 50) in each of which a stator winding strand (30, 32) is connected in series with a controllable semiconductor switch (34, 44), which two series circuits are connected in parallel to form a parallel circuit (52). In addition to the strand-connected switches (34, 44) typically found in an ECM, in a supply lead to said parallel circuit (52), a third controllable semiconductor switch (60) controls energy supply from the DC power source (63). In order to increase motor efficiency and minimize the size of any motor capacitor required, special switching steps are performed so that electromagnetic energy, remaining in the winding(s) after shutoff of power application, is converted into motor torque, instead of being dissipated as heat.

The invention discloses a manufacturing method capable of effectively improving product life of a capacitor, which comprises the following manufacturing steps of: first step: winding; second step: hotpressing; third step: metal spraying; fourth step: energizing; fifth step: testing; sixth step: welding and assembling; seventh step: filling; and eighth step: final product testing. The method is characterized in that a heat treatment step is further included between the second step: hot pressing and the third step: metal spraying, and a second heat treatment step and second testing are furtherincluded between the fifth step: testing and the sixth step: welding and assembling. The method mainly aims at a motor capacitor which is subjected to heat treatment process after finishing the primary winding and hot pressing so as to remove moisture inside a core and stabilize product capacity; and after the test step, the product is subjected to heat treatment, thereby improving the product life.

A liquid crystal display panel of the active matrix drive type is disclosed. Each pixel is provided with an storage capacitor, wherein capacitors for stabilizing the voltage are added to the common storage capacitor bus line that applies a predetermined potential to the storage capacitor bus lines provided for each of the rows to absorb noise that mixes into the storage capacitor bus lines through parasitic capacitances, thereby to decrease fluctuation in the voltage of the storage capacitor bus lines and to prevent the occurrence of display unevenness and crosstalk. Capacitors Ccs for stabilizing the voltage are added to a common storage capacitor bus line (vertical Cs line) 5 that applies a predetermined potential (storage capacitor bus line voltage Vcs) to the storage capacitor bus lines (horizontal Cs lines) 4 provided for each of the rows to form a common side of the storage capacitors Cs formed in each of the pixels. The capacitors Ces are formed by utilizing the common storage capacitor bus line (vertical Cs line) 5. The capacitors Ccs may be formed in the MOS structure.

The invention discloses a photovoltaic inverter which comprises four switch circuits, two follow current circuits, two filter inductors, and a storage capacitor. Each follow current circuit is composed of a follow current switch device and a follow current diode in serial connection, wherein the follow current diode is a backward diode. The switch circuits are controlled by high-frequency PWM (pulse width modulation) signals, the follow current circuits are controlled by low-frequency signals identical with output of the inverter in frequency, and the storage capacitor is bridged at an input port of a full-bridge topological circuit. The photovoltaic inverter has the advantages that low power consumption, lower ripper waves, low cost, high efficiency, high reliability and the like.

The invention discloses a high-power-factor direct-current current output light-emitting diode (LED) driving circuit with a low-energy-storage capacitor. The LED driving circuit is composed of a diode rectifying bridge (1), an active non-linear capacitor network (3) and a follow-up switch power converter (2). The output end of the diode rectifying bridge (1) supplies power to the active non-linear capacitor network (3). Output voltage of the active non-linear capacitor network (3) is formed by overlapping direct current voltage with alternating current voltage with twice of electric supply frequency. The output voltage of the active non-linear capacitor network (3) supplies power to the follow-up switch power converter (2). The active non-linear capacitor network (3) is composed of a lower-energy-storage capacitor and an active switch network. By means of the LED driving circuit, the low-capacitance capacitor (such as a thin film capacitor and a ceramic medium capacitor) can be utilized to finish the energy storage function.

The present invention relates to the field of power system fault detection technology, especially to a power capacitor operation state monitoring method based on voltage comparison. The method comprises the following steps that: 1) a measurement device obtains a bus voltage value U from a secondary circuit of a voltage transformer TV of a transformer substation bus where a power capacitor C complete device is located; 2) a theoretical value U'c of a running voltage of the power capacitor C is obtained through calculation, wherein U'c=U/(1-[Beta]; 3) an actual running voltage value Uc of the power capacitor C is obtained from a secondary side of the voltage transformer TV being connected in parallel with two ends of the power capacitor C; and 4) the theoretical value U'c of the running voltage of the power capacitor C and the measured actual running voltage value Uc of the power capacitor C are analyzed and compared. The method provided by the invention can perform voltage parameter measurement and analysis calculation in the actual running condition to really reflect the running state of the power capacitor, performs three-phase simultaneous online detection to allow the measurement result credibility to be higher, and can discover defects which cannot be discovered in a low voltage and a small current, of a black-out test.

The invention discloses a special withstand voltage testing device and method for a power capacitor. The special withstand voltage testing device comprises a power supply, a voltage regulator, a transformer and a serial-parallel resonant circuit which is arranged at the other side of the transformer and corresponds to the voltage regulator; the serial-parallel resonant circuit comprises a serial compensation reactor, a parallel compensation reactor, a wave-modulating resistor, a silicon controlled rectifier trigger control device, a high voltage divider and a digital storage oscilloscope, wherein the serial compensation reactor is serially connected with a testing capacitor; the parallel compensation reactor is connected in parallel with the testing capacitor; the wave-modulating resistor is connected in series in the circuit; the silicon controlled rectifier trigger control device is connected with the wave-modulating resistor; the high voltage divider and the digital storage oscilloscope are connected at two electrodes of the testing capacitor; and the serial-parallel resonant circuit is grounded. The testing method provided by the invention has the benefits that: (1) the problem of slower voltage boosting of the general voltage regulator is solved by using a method for instantaneously changing a resonant parameter to generate a high voltage; (2) the time of withstanding a high voltage on a test product can be precisely controlled by controlling the on time of a silicon controlled rectifier; and (3) the test voltage is controlled precisely and the oscilloscope can be simultaneously triggered to collect test waveforms.

The invention discloses a method for manufacturing anode foil of an alternating current motor capacitor. The method includes the steps of hydration processing, five-stage formation processing, high-temperature heat processing, depolarization processing, repairing formation processing, post-processing and drying processing, and is characterized in that the formation preprocessing step is additionally executed after the hydration processing step, the hydration processing step is that immersion processing is carried out with an ethanediol water solution, and the formation preprocessing step is that the corroded foil obtained after hydration processing is placed into a maleic acid solution for immersing processing. According to the method, hydration processing is carried out in the first stage of the anode oxide film forming working procedure with the ethanediol water solution, and the dielectric property of anode oxide film is improved; the corroded foil obtained after hydration processing is processed with the maleic acid to prevent the foil from being seriously corroded, and the water resisting property of the oxide film is finally achieved; formation is carried out with phosphoric acid and a saline solution of the phosphoric acid in first-stage formation processing and second-stage formation processing, and the specific volume is easily improved; meanwhile, due to the fact that phosphoric acid film is thin, the bending strength of the formed foil can be obviously improved.

The invention discloses a pulsed-liquid phase discharge system based on multi-path IGCT parallel connection, belonging to the pulse power source field. The system can be composed of two or more paths of parallel discharge circuits; each path of elements contain a current-limiting inductor, a storage capacitor, freewheeling diodes, IGCT switches and a pulse transmission line which are connected in turn; the current-limiting inductor is in serial connection in the charge circuit of the storage capacitor; the storage capacitor can be composed of one or more of low sensitivity solid pulse storage capacitors which are connected in parallel; two ends of the storage capacitor are in parallel connection with freewheeling diodes; each path of IGCT switches can be composed of one or more of IGCTs which are connected in series and triggered by an external trigger circuit, the output ends are separately connected with the high-voltage input end of the pulse transmission line and in the circuit, and the low-voltage input ends of the pulse transmission line are successively connected with the low-voltage ends of the storage capacitors in other circuits in a staggered manner. The system can effectively solve the synchronization problem of switches and realize large electric current discharging up to hundreds of kiloamperes.

A motor start circuit for an AC induction motor employs a DC relay whose NC contacts are placed in series with the start capacitor. A half full-wave rectifier arrangement has an AC input connected to the junction of the relay switch and the start capacitor, and DC outputs applied across the relay actuator coil. In the event of intermittent application of power to the motor, any residual charge on the start capacitor will feed current to the actuator coil to hold the relay switch open until the residual charge has decayed sufficiently, to avoid damage to the motor from capacitive discharge. A high magnetic retentivity core can be used to hold the relay off for sufficient time for stored energy to dissipate.

The invention discloses a fan subassembly for a gas water heater. The fan subassembly comprises a smoke inlet duct, a volute mounting plate, a volute module, a centrifugal wind wheel, a motor support and a motor. The smoke inlet duct is provided with a front side plate, a left side plate, a right side plate and a rear side plate. The volute module is provided with a volute front plate, a volute air channel plate, a volute rear plate, a smoke outlet connecting plate and an outlet flue. Volute air channel plate protruding parts penetrate volute front plate long-thin holes to be bent and fastened; and the volute air channel plate protruding parts penetrate volute rear plate long-thin holes to be bent and fastened. Front side plate protruding parts respectively penetrate left side plate long-thin holes and right side plate long-thin holes to be bent and fastened, and rear side plate protruding parts respectively penetrate left side plate long-thin holes and right side plate long-thin holes to be bent and fastened. By the adoption of the technical scheme, the fan subassembly effectively resists oil fume corrosion and prolongs service life; the product is simple in structure, the tooling die cost is low, a motor capacitor is convenient to install, the production efficiency is improved, no gap is formed at the bent position of the smoke inlet duct, and the problem of smoke leakage is solved.

A switching module for a corner capacitor bank, comprising an improved corner capacitor bank, four controllable switches K1, K2, K3, K4, two small inductors L1, L2, two capacitor precharging circuits 10, 20, and Controllable switch drive circuit; the invention is connected to the A, B, and C phase lines of the three-phase distribution network line, and can realize asynchronous compensation between the phases of AB, BC, and AC. Multiple modules can be used together to avoid under-compensation or over-compensation of reactive power. Compensation occurs. The controllable switch adopted in the present invention can accurately control the switching time of each capacitor, avoiding the generation of surge current, and the small inductance connected in series with the controllable switch and the capacitor pre-charging circuit connected in parallel with the controllable switch suppress the capacitor input The impact current that may be caused by the power grid, these two points prolong the service life of the module and ensure the safe operation of the entire device.

A motor capacitor verification unit includes a capacitor selection section coupled to an electric motor employing a motor capacitor for its operation that connects the motor capacitor for verification testing. Also included is a capacitor testing section coupled to the capacitor selection section that evaluates the motor capacitor for operation with the electric motor. Further included is an AC power control section coupled to the capacitor testing section and that only permits application of an AC operating voltage to the electric motor and the motor capacitor after a successful motor capacitor verification as required for electric motor operation. An electric motor operating system, an HVAC operating system and methods of operating an electric motor, retrofitting a motor capacitor verification unit to an electric motor and manufacturing a motor capacitor verification unit for use with an electric motor are also provided.

The invention provides a motor capacitor and a single-phase motor. The technical problems that an existing YL single-phase motor is large in overall size, poor in running capacitor and starting capacitor performance, prone to damage and single in function are solved. The capacitor comprises at least two groups of conductive polar plates, wherein the capacity of the capacitor is changed by controlling the relative area between the two groups of conductive polar plates or controlling a series-parallel structure between the two groups of conductive polar plates, so that unification of a startingcapacitor and an operation capacitor is achieved, and the capacitor size is effectively reduced. The relative area of the conductive polar plates in each group of conductive polar plates or the controlled change of the series-parallel structure can be quickly switched between the parameter and capacity requirements of the starting capacitor and the operating capacitor, the starting efficiency canbe ensured when the starting capacitor is used, and the operating efficiency can be ensured when the operating capacitor is used. The assembly size of the corresponding motor is effectively reduced. Meanwhile, the control mode is simple and convenient, the circuit structure is reliable, and faults can be rapidly and visually checked and eliminated even if the faults occur.

The invention provides a motor capacitor assembling device. The motor capacitor assembling device comprises a capacitor conveying mechanism, a shearing mechanism, a plug-in mounting mechanism, a bending mechanism and a pin fixing mechanism, and the plug-in mounting mechanism comprises a clamping device and a overturning moving structure. The bending mechanism is configured to toggle a bent pin. The pin fixing mechanism is configured to fix the end part of the pin of the motor capacitor inserted into the motor middle plate on the support of the motor middle plate. The motor capacitor is conveyed through the capacitor conveying mechanism, the clamping device of the plug-in mounting mechanism clamps a pin of the motor capacitor so that the shearing mechanism can cut off the pin of the motor capacitor, then the overturning moving structure drives the clamping device to rotate, overturn and move so that the clamped motor capacitor can be inserted into a motor middle plate, and the bending mechanism bends the pin. Then the pin is pressed, bent and fixed on a support through the pin fixing mechanism, so that the automatic cutting, inserting, bending and fixing of the pin of the motor capacitor are realized. The efficiency is high, the assembly consistency is good, the quality is high, and manpower is greatly saved.

The invention provides an active filter suitable for suppressing pulse power current ripples. The active filter comprises a passive filter, a pulse power converter, a bi-directional power converter and an active filter energy-storage capacitor, wherein the passive filter consists of an inductor and a capacitor; the pulse power converter comprises a switch tube, a diode, an inductor and a capacitor; the bi-directional power converter comprises two switch tubes and an inductor; the active filter energy-storage capacitor consists of a capacitor. According to the active filter suitable for suppressing the pulse power current ripples, provided by the invention, effective suppression on the pulse power current ripples is realized by controlling the working modes of the pulse power converter and the bi-directional power converter; the structure is simple, the design and the regulation are flexible, and higher practicability is obtained.

The invention relates to a metal spraying technology for a motor capacitor. After being shaped through hot compression, a wound core is tied by an adhesive tape. Then, the core is conveyed into a rotating disc type electric arc metal spraying machine. The two end surfaces of the core are first sprayed with Zn-Li-Bi rare earth alloy layers, and then, Al-Zn alloy layers are sprayed on the Zn-Li-Bi rare earth alloy layers. Through the optimizing design of the existing metal spraying technology, by adopting the mode of first spraying the Zn-Li-Bi rare earth alloy layers and then spraying the Al-Znalloy layers on the Zn-Li-Bi rare earth alloy layers, bonding force between the metal spraying layers and the end surfaces of the core is obviously improved, and the qualified rate of the finished product can reach 99.1%.

The invention provides a fractional-order wireless power transmission system for offsetting internal resistors by using fractional-order capacitors. The fractional-order wireless power transmission system comprises a high-frequency power source, a transmitting circuit, a receiving circuit and a load, wherein the transmitting circuit comprises a primary fractional-order capacitor, a primary transmitting coil and internal resistors of a primary circuit which are connected in series; the internal resistors of the primary circuit are all positive resistors, including the internal resistor of the primary transmitting coil, of the primary circuit; the receiving circuit comprises a secondary fractional-order capacitor, a secondary receiving coil and internal resistors of a secondary circuit which are connected in series; and the internal resistors of the secondary circuit are all positive resistors, including the internal resistor of the secondary receiving coil, of the receiving circuit. Partial or complete offsetting of the internal resistors of the circuits is achieved by adopting series resonance of the fractional-order capacitors and the coils and simultaneously utilizing the property that each fractional-order capacitor has a negative resistor component within a specific parameter range.

The invention discloses an oil immersed CBB60-type alternating current motor capacitor, which comprises a cylinder-shaped shell [4] and a capacitor core [5] in the cylinder-shaped shell [4]. The alternating current motor capacitor further comprises a seal cover [2], which is covered with an epoxy resin coat [1] and forms a sealed body together with the shell [4]. Castor oil [3] is filled between the capacitor core [5] and the shell [4] in the sealed body, the lower end of a leading-out terminal [6] passes through the epoxy resin coat [1] and the seal cover [2] to be electrically connected with the capacitor core [5]. The invention reduces the using amount of the epoxy resin, reduces cost, maintains environment and improves working efficiency.

The present invention discloses a novel direct-current busbar. The novel direct-current busbar comprises absorption capacitors, energy storage capacitors, a positive pole, a negative pole and an insulating layer; the plurality of energy storage capacitors are arranged to form a ring-shaped structure; the plurality of the energy storage capacitors are connected in parallel; the positive pole is connected with one end of each of the energy storage capacitors; the other ends of the storage capacitors are connected with the negative pole; the insulating layer is stacked on the positive pole; the negative pole is stacked on the insulating layer; the plurality of absorption capacitors are arranged to form a ring-shaped structure; the absorption capacitors are located on the negative pole; the absorption capacitors are used for decreasing parasitic inductance; the plurality of absorption capacitors are connected in parallel; and the storage capacitors are connected in parallel with the absorption capacitors. With the novel direct-current busbar provided by the invention adopted, parasitic inductance in a power loop can be effectively decreased, and therefore, voltage and current overshoot of a silicon carbide power device during a switching process can be decreased, switching loss can be reduced, and the service life of the silicon carbide power device can be prolonged.