51results about How to "Reduce the number of coils" patented technology

A non-contact power supply system includes a power supply device for transmitting high frequency power and a load device which receives the high frequency power in a non-contact mode by electromagnetic induction to supply it to a load. The power supply device includes a power transmission unit having a primary power coil and an inverter circuit, an inquiry unit having at least one primary signal coil and an oscillation circuit, a signal detection unit and a control unit. The load device includes a power reception unit having a secondary power coil magnetically coupled to the primary power coil and a power conversion unit, a secondary signal coil magnetically coupled to the primary signal coil, and a response unit which is operated by electromotive force induced in the secondary signal coil. The control unit stops power transmission when no signal is detected and executes power transmission which a signal is detected.

A synchronous electric machine having a fixed stator, a multi-phase stator winding and having a rotor which has poles, excited in a predefined sequence, over its circumference, the number of poles being changeable as a function of the intensity and the direction of a field current in at least one field coil of the rotor. For improving the efficiency of the machine and for reducing the number of field coils and the entire coil cross section it is provided that the rotor has a laminated core, laminated in the axial direction, which has grooves on the circumference for accommodating the at least one field coil and that the at least one field coil is situated on the circumference of the rotor with a step size which corresponds to the pole pitch of the lower number of poles.

A linear motor system includes a discontinuous linear motor and motor control device. The discontinuous linear motor includes a mover and a plurality of individual motors spaced from each other along a movement path of the mover. Each of the individual motors functions as an armature on a primary side of one independent linear motor. A sensor, arranged to act as a linear scale, is disposed for each individual motor and detects a position of the mover. The motor control device includes a plurality of individual motor control units and a multiple unit controller to comprehensively control the individual motor control units. The individual motor control units control the individual motors disposed in curved path sections, and each of the individual motor control units includes a curved-line correspondence corrector to correct a detection value obtained from the sensor according to a relationship between a curved line of the path and a position of the sensor.

The invention discloses an excitation measuring multiplexing coil assembly for magnetic induction tomography and a data collection method. A group of coils are arranged around a measured object, the centers of the coils are in the same plane, and any one coil can be used as both an exciting coil and a measuring coil; when a coil is used as an exciting coil, the rest coils are used as measuring coils; the exciting coil is electrified with alternating current, the eddy current sensing signal is detected through the measuring coils; and then all the coils are traversed in sequence and respectively used as the exciting coils, the measurement signals are detected through the measuring coils, and the impedance distribution image of the measured object in the fractured layer of the coil centers can be reconstructed according to all the measured data through a magnetic induction tomography algorithm. According to the invention, on the premise that the coil assembly and the measured object arekept stationary during the measuring process of a traditional magnetic induction tomography system, one coil is arranged at one position, thus the number of the coils is reduced by 50%, the coupling relation among the coils is simplified, and the measurement precision and stability of the data acquisition system are improved.

The invention comprises: a controller; a first diverter switch group; a second diverter switch group; a first winding coil of the transformer connected to the load and the first diverter switch group; a secondary winding coil connected to the second switch group; a energy storage device; a power feedback circuit; a DC to DC converter used for boosting the DC voltage outputted from the energy storage device; a current transformer used for making a boosted DC voltage to sense a first AC voltage in order to output a second AC voltage, and making the second AC voltage to response the connection state between second diverter switch group and the second winding coil in order to adjust the value of first AC voltage transmitted to the load so as to provide a voltage meeting the running requirement of load.

A group of magnetic sheets are stacked and connected via through-holes, on each of which magnetic sheets a circling pattern having connection parts at its corners and ends is formed to form a spiral coil pattern. Leader patterns each have a leader part formed at a position not overlapping with the circling parts of the coil pattern and connected to an external terminal electrode, as well as two connection parts that continue to the leader part and are formed at positions corresponding to the connection parts of the circling patterns, together with a cutout formed between the two connection parts. Magnetic sheets with the leader patterns are provided at the top and bottom of the laminate forming the coil pattern. The multilayer chip inductor can suppress decrease in core area caused by displacement due to the stacking

The invention relates to an indirect medium heating furnace heat exchange intensifying device and a method thereof. The device comprises a fuel gas decoupling chamber, an air decoupling chamber, a starting sweeping blower, a thermal acoustic coupling pulsating inflamer, a pressure gauge or a vacuum meter, an exhaust device free from condensing gas, a rigid connecting piece, a coil pipe, a shell and an exhaust smoke pipe, wherein, the thermal acoustic coupling pulsating inflamer is composed of an air check valve, a fuel gas check valve, a fuel gas nozzle, a combustion chamber, a tail pipe and an exhaust decoupling chamber. The method includes: the combustion chamber and a smoke tube adopt a gas pulsation heat exchange mode and eradicates a smoke flow boundary layer in the chamber wall and a smoke tube wall, thus improving heat convection coefficient at the smoke gas side and reducing heat exchange area; the heat exchange between the indirect heat transmission medium (water) and the heated fluid coil plate adopts a stable dropwise condensation heat exchange way realized by mechanical vibration of the pipe coil, thus improving heat convection coefficient of the indirect heat transmission medium (water) and the heated fluid coil plate and reducing heat exchange area.

An isolating self-oscillation flyback converter includes a coupling transformer T1, a FET TR1, a transistor TR2, a photoelectric coupling isolator OC1 and a load feedback circuit Adj. The common polarity terminal of a feedback winding Nfb of the coupling transformer T1 is connected to the gate of the FET TR1 via a capacitance C1 and a resistance R2, and connected to the base of the transistor TR2 via a capacitance C2. The base of the transistor TR2 is also connected to the emitter of the photoelectric coupling isolator OC1. The photoelectric coupling isolator OC1 is connected to the positive terminal of the output voltage. The opposite polarity terminal of the feedback winding Nfb is connected to the collector of the photoelectric coupling isolator OC1 via a resistance R5, and connected to ground via a capacitance C5. The common polarity terminal of the feedback winding Nfb is also connected to the cathode of a diode D, and the anode of the diode D is connected to ground. A set of windings are removed by forming a loop circuit directly between the feedback winding Nfb and the photoelectric coupling isolator OC1.

An insulating housing for a motor terminal includes a plurality of electricity supply members each having a connector terminal for connection to a power supply and a coil terminal to which a motor coil is connected; and an insulating housing main body for insulating the plurality of electricity supply members from each other and holding the electricity supply members. The insulating housing main body integral with the electricity supply members is formed by insert-molding with the plurality of electricity supply members spaced in an insulating interval from each other and disposed on the same plane after bending, then the connector terminal is protruded within a connector insertion opening formed integral with the insulating housing main body, and the coil terminal is protruded onto the same plane as the peripheral surface of the insulating housing main body.

Embodiments of the present invention relate to the technical field of RF circuits, and in particular, to a balun. In an embodiment of the present invention, a balun is provided which comprises at least two coaxial cables, each of which is wound into at least one loop, and the inner and outer conductors of one end of all coaxial cables are connected respectively to each other and the inner and outer conductors of the other end are also connected to each other. The novel balun according to the embodiments of the present invention has a small size but a large power capacity and low cost, and can be used in a magnetic field environment.

An eddy current probe uses magnetic gap The probe has a small size; and coil number in the probe is reduced. Hence, the probe can move easily inside and outside a tube and detect an end of the tube as close as possible.

A multipole lens is provided which is for use in electron microscopy and which is simple in structure but capable of producing X- and Y-components of a quadrupole field and X- and Y-components of an octopole field. The multipole lens (100) comprises: first through twelfth polar elements (10-1 to 10-12); first through sixteenth coils (20-1 to 20-16); a first power supply (30-1) for supplying currents to the coils (20-1, 20-4, 20-9, 20-12); a second power supply (30-2) for supplying currents to the coils (20-3, 20-5, 20-11, 20-13); a third power supply (30-3) for supplying excitation currents to the coils (20-6, 20-8, 20-14, 20-16); and a fourth power supply (30-4) for supplying excitation currents to the coils (20-2, 20-7, 20-10, 20-15). The coils (20-1, 20-3, 20-6, 20-7, 20-9, 20-11, 20-14, 20-15) produce magnetic fields in a first direction. The coils (20-2, 20-4, 20-5, 20-8, 20-10, 20-12, 20-13, 20-16) produce magnetic fields in a direction opposite to the first direction.

The invention discloses a stroboflash-free active power factor correcting circuit applied to LED drive. The stroboflash-free active power factor correcting circuit applied to LED drive comprises a rectifying circuit, a filtering capacitor, a first-level inductor, a control chip, a power tube, a transformer and an LED load circuit and is characterized by further comprising an energy storage capacitor, a first switch tube and a second switch tube, wherein one end of the first-level inductor is connected with the output end of the rectifying circuit, the other end of the first-level inductor is connected with the drain electrode of the power tube and the positive pole of the energy storage capacitor, the transformer comprises at least one main coil, one end of the main coil of the transformer is connected with the source electrode of the power tube through a sampling resistor, and the other end of the main coil of the transformer is in parallel connection with the negative pole of the energy storage capacitor. The stroboflash-free active power factor correcting circuit provides direct current constant source through the energy storage capacitor, two times of ripple waves of power frequency are eliminated, no stroboflash is output while power factor correction, the circuit is simplified, and cost is reduced.

The invention discloses a sunk plate type filter, comprising a framework, wherein four corners of the framework are provided with outer edges; pins are vertically connected with the outer edges; a groove is arranged in the middle of the framework; a raised structure is arranged in the middle of the groove; a magnetic core is arranged in the groove and connected with the raised structure; and coils are wound on the magnetic core and connected with the pins. The sunk plate type filter is thin in thickness and is embedded in a circuit board; the height is less than 8mm after the sunk plate type filter is mounted; in the filter, a ferrite core with high-magnetic permeability is adopted, thus increasing the magnetic permeability, reducing the cycles of windings and shortening the filter volume; and a butterfly-shaped threading mode is adopted for the filter, thus improving the frequency characteristics of products and strengthening the inhibition capacity of EMI (electro-magnetic interference).