44results about How to "Small reactance" patented technology

An induction heating roller device that keeps leakage current within specifications and prevents the occurrence of erroneous operations caused by common mode noise. The induction heating roller device includes an induction coil (1), a grounded heating roller (2) magnetically coupled to the induction coil and heated by electro-magnetic induction. A power factor improving capacitor (3) is connected in parallel to and near the induction coil and has a grounded intermediate point. A high-frequency power source (4) biases the induction coil. The leakage current produced by distributed capacitance between the induction coil and the heating roller is returned to the high-frequency power source via the power factor improving capacitor. Thus, the leakage current does not flow out of the induction heating roller device.

The invention discloses a continuously controllable transformer. A continuously controllable transformer core comprises five pillars arranged in a cross shape, wherein the five pillars comprise a central pillar and four side pillars, are parallel to one another and form a magnetic flux loop by crossed beams; the central pillar is provided with AC coils L1 and L2; the side pillar I is provided with the AC coil L3 and a DC coil L5; the side pillar II is provided with the AC coil L4 and the DC coil L6; the side pillar III is provided with the DC coil L7; the side pillar IV is provided with the DC coil L8; the like end of the coil L5 is connected with that of the coil L6; the like end of the DC coil L7 is connected with that of the DC coil L8; an AC control power supply I is connected to the input end of a first full-bridge rectifier circuit by a pair of thyristors which are inversely connected in parallel; the AC control power supply II is connected to the input end of a second full-bridge rectifier circuit by another pair of thyristors which are inversely connected in parallel; and the output of the second full-bridge rectifier circuit is connected with terminals III and IV.

The present invention provides a superheated steam generating device and a method for manufacturing a conductor tube used in the device. By forming a short circuit in the conductor tube, the reactance can be reduced, and the possibility of damage to the junction part and the conductor tube can be reduced. The superheated steam generating device induction-heats the helically wound circular tubular conductor tube through a magnetic flux generating mechanism provided inside or outside the winding portion of the conductor tube, and heats the water flowing through the conductor tube. The steam generates superheated steam, and substantially the entire winding portion of the conductor tube, the opposing surfaces of the adjacent adjacent parts are joined by the joint part, and the thickness of the joint part is equal to or greater than the tube thickness of the conductor tube.

The invention discloses a super-conducting type controlled reactor with high leakage reactance. Three windings are wound on an iron core (1), a primary copper main coil (2), a secondary super-conducting control winding b (4) and a secondary super-conducting control winding a (3) are sequentially arranged from outside to inside, and the primary copper main coil (2), the secondary super-conducting control winding a (3) and the secondary super-conducting control winding b (4) are independent of one another. The super-conducting type controlled reactor with the high leakage reactance has the advantages of low induced voltage, low winding consumed power and high linearity, a function of limiting secondary arc current can be realized, and the quantity of super-conducting windings in practical application can be configured according to volume regulation of the controlled reactor.

The invention discloses a full-superconducting primary excitation linear generator for direct-drive type wave power generation. The full-superconducting primary excitation linear generator comprises a primary stator and a secondary mover, wherein the primary stator comprises multiple groups of stator units arranged in a straight line; each stator unit comprises a U-shaped core, primary armature windings and primary exciting windings; the U-shaped core comprises two primary cores; an opening of the U-shaped core faces the secondary mover; the primary armature windings are arranged in the primary cores; the primary exciting windings are arranged in the U-shaped core; the secondary mover is the core which does not contain a winding and has a cogging structure; and a corresponding cogging structure is arranged on each primary core. According to the full-superconducting primary excitation linear generator, an arc-shaped structure exciting winding sleeves the outside of each primary core; and a cooling system does not move, so that the complexity level is reduced. The magnetic field conversion rate and the terminal voltage can be increased by a multi-tooth structure secondary; the defect of a low low-speed voltage is compensated; and by unequally-spaced teeth, the voltage frequency and amplitude generated when the generator moves to the end part are increased by reducing the end-part tooth pitch.

The invention relates to a thyristor controlled short circuit current limiter. In the limiter, a reactive coil L1 and a direct current coil L2 form a saturation reactor; the reactive coil L1 is used as an alternating current passage; the direct current coil L2 is used as a direct current passage; the reactive coil L1 interacts with the direct current coil L2 through a closed loop iron core in the saturation reactor; one end of the reactive coil L1 is connected with an input end of a full bridge rectifier circuit, and the other end of the reactive coil L1 and the other input end of the full bridge rectifier circuit are connected with an external circuit; an output end of the rectifier circuit is connected in series with a forward diode D7 and the direct current coil L2 to form a closed loop; two thyristors D5 and D6 are reversely connected in parallel between two input ends of the full bridge rectifier circuit; the thyristors which are reversely connected in parallel are controlled by control modules of the thyristors respectively; each control module is provided with three terminals; and two of the three terminals are connected with the positive electrode and the negative electrode of the controlled thyristor D5 or D6, and the third terminal is connected with a touch end of the controlled thyristor D5 or D6.

The invention relates to a split reactor with two symmetric branches. A first branch of the split reactor is formed by sequentially connecting an upper external coil lead, an upper external coil, a first intermediate lead, a lower internal coil and a lower internal coil lead in series, a second branch of the split reactor is formed by sequentially connecting an upper internal coil lead, an upper internal coil, a second intermediate lead, a lower external coil and a lower external coil lead in series, and the first branch and the second branch of the split reactor are symmetric in structure; and when a circuit is connected, the upper external coil lead and the upper internal coil lead are connected, the lower external coil lead and the lower internal coil lead are respectively connected with different branches, or the lower external coil lead and the lower internal coil lead are respectively connected with different circuit components and are then are connected in parallel with the same circuit. The split reactor is high in coupling degree, the voltage is reduced during normal running, the reactance is large when a fault occurs, and an effect of effectively limiting a short-circuit current is achieved.

The invention relates to a power control circuit board. Power control devices such as an MOSFET (Metal Oxide Semiconductor Field Effect Transistor), an IGBT (Insulated Gate Bipolar Transistor) and the like of an upper bridge and a lower bridge of the power control circuit board are symmetrically arranged, so that the output terminals of the power control devices are connected in the neighborhood in the middle of the power control devices of the upper bridge and the lower bridge by using conductors; and the power supply terminals and the grounding terminals of the power control devices of the upper bridge and the lower bridge are connected in the neighborhood at the two sides of the power control devices of the upper bridge and the lower bridge, a filter capacitor is connected between the power supply terminals and the grounding terminals of the power control devices of the upper bridge and the lower bridge, and a power control unit is formed. A plurality of power control units are arranged in a shape like a Chinese character 'pin or lu', so that a power control stage is formed, a power positive line, a power ground line and a power output line are connected in the neighborhood, and reactance (distributed resistance and distributed inductance) of the conductors of the circuit board is reduced to the minimum. The performance and the efficiency of the power output stage are increased.

A smelting short net, comprising a first main row, a second main row, a third main row and a first branch row, a second branch row correspondingly connected to the first main row, the second main row, and the third main row and the third branch row, the first branch row, the second branch row and the third branch row are all provided with electrode rods, the first main row, the second main row and the third main row are arranged in parallel with each other, and the second main row The row is located below the first main row and the third main row and the distance between the first main row, the second main row and the third main row is equal; the first branch row, the second branch row and the third branch row respectively pass through The electrode pushing device is connected with the electrode rod; the electrode pushing device includes a linear propulsion mechanism and an electrode rod fixing device arranged on the linear propulsion mechanism, the electrode rod fixing device is made of conductive material, and a There is insulation.

The invention discloses a left-handed-medium-based round moment ring composite pole antenna which comprises an upper dielectric substrate (1) and a lower layer dielectric substrate (2) jointed together. The left-handed-medium-based round moment ring composite pole antenna also comprises a composite pole antenna (4) and round moment resonant rings (3) which are symmetrically fixed on one side of the tail end of the composite pole antenna (4) according to a 2x3 array, wherein the composite pole antenna (4) is connected with each round moment resonant ring (3) through metal strips (5); and 6 round moment resonant rings (3) are arranged on the front side of the lower layer dielectric substrate (2), and the positions of the 6 round moment resonant rings (3) are completely opposite to those of the round moment resonant rings (3) on the front side of the upper layer dielectric substrate (1). According to the combination of the round moment resonant rings (3) and the composite pole antenna (4), the magnetic permeability can be increased, the electromagnetic wave resonance strength can be enhanced in a specific frequency range, the antenna gain is increased and the return loss is reduced.