85results about How to "Suppress saturation" patented technology

An electromagnetic steel plate forming member provides the two magnet holes for inserting therein the two permanent magnets per pole along the V-shape, which are provided in the region of the radial pole pitch lines OP provided in the rotor core at the predetermined pole pitch angle θ, one magnet hole is displaced in a direction apart from the center line OC of the pole pitch lines OP, and the other magnet hole is displaced in a direction approaching to the center line OC of the pole pitch lines OP.

A transformer that improves the DC superposition characteristic without incurring eddy-current losses. In the transformer, a part of a plate-like core opposing a top face of a flange of a drum core is formed with a first opposing portion opposing none of input and output terminals and a second opposing portion opposing the input and output terminals. A first gap is formed between the top face and the first opposing portion by a spacer. A second gap greater than the first gap is formed by a recess of the plate-like core provided so as to correspond to the second opposing portion. This allows magnetic fluxes to pass between the top face and the first opposing portion where the gap is formed and inhibits them from passing between the plate-like core and the input and output terminals where the second gap greater than the first gap is formed.

A magnetic head comprises a pole layer, a shield layer, a gap layer disposed between the pole layer and the shield layer, and a coil. The shield layer incorporates a first layer, a second layer, a third layer and a fourth layer that are disposed on the gap layer one by one. The first layer has an end face located in a medium facing surface. The second layer has: a first surface located in the medium facing surface; a second surface touching the first layer; and a third surface opposite to the second surface. The third layer touches the third surface of the second layer. An end face of each of the third and fourth layers closer to the medium facing surface is located at a distance from the medium facing surface.

A color signal processing device for generating image data to be displayed on a display device which represents a color by using at least four primary colors, includes an obtainer that obtains a color signal regarding three primary colors for image data composed of a plurality of pixels, a changer that changes a value of the obtained color signal regarding the three primary colors, and a converter that converts the changed color signal regarding the three primary colors into a color signal regarding four primary colors. When a predetermined region contains a color saturated pixel, the changer makes the value of the color signal of at least one color of the three primary colors smaller, for pixels contained in the predetermined region.

The collectors of transistors are connected via respective resistances to a power supply terminal receiving a power supply voltage. The emitters of the transistors are connected to a ground terminal via respective resistances. A shunt resistance, a FET, and a shunt resistance are connected in series between nodes connected to the respective emitters of the transistors. The gate of the FET is connected via a resistance to a control terminal receiving a control voltage. The shunt resistances and FET form a variable resistance circuit.

Conventionally, there has been a danger that CCD saturation may occur because of the influence of the shot noise and the environment light if a higher resolution of a distance image showing the distance to an object present in a target space and a higher frame rate are achieved when the distance image is estimated by the TOF method, and the distance accuracy may degrade. An emission frequency selecting unit (7) receives light (S2) reflected from the object when a light source does not emit light and selects illumination light (S1) having an emission frequency insusceptible to the environment light according to the frequency analysis of the reflected light (S2). An image creating unit (6) selects a light source emitting the illumination light having the optimum emission frequency from among prepared light sources (9A to 9N), receives reflected light of the illumination light from the selected light source, and creates the distance image showing the distance to the object. The environment light can be mitigated during light reception, and the noise influence on the distance accuracy can be mitigated when a light-receiving element unit (2) exhibiting higher resolution is used.

A magnetic memory device in which an MRAM element is magnetically shielded from a large external magnetic field in an satisfactory manner, making it possible to surely achieve an operation free of problems in a magnetic field generated by the environment in which the MRAM element is used. A magnetic random access memory (MRAM) (30) is constituted by a TMR element (10) having a magnetized pinned layer (4), (6) with fixed direction of magnetization and a magnetic layer (memory layer) (2) with changeable direction of magnetization stacked on one another, mounted on a substrate together with another element (38), such as a DRAM, wherein a magnetic shielding layer (33), (34) is formed in a region corresponding to an area occupied by the MRAM element (30) or / and a magnetic shielding layer (33), (34) is with a distance of 15 mm or less between the opposite sides (especially, a length or a width).

A current sensor includes a magnetic detection element configured to detect magnetism produced from a current path and a magnetic shield core. The magnetic shield core includes a core portion arranged so as to extend around the current path such that the current path is positioned therein, a gap portion formed by cutting a part of the core portion and in which the magnetic detection element is arranged, and at least a pair of shield portions extending from the core portion toward the outside opposite to the inside of the core portion where the current path is arranged, so as to correspond to the magnetic detection element.

The efficiency of an induction motor is improved while suppressing the generation of magnetic flux saturation of a rotor core. In an induction motor, “a magnetic path width of a rotor” which is the product of a circumferential width of a rotor tooth formed in the rotor and the number of rotor teeth is equal to or larger than “a magnetic path width of a stator” which is the product of a circumferential width of a stator tooth formed in the stator and the number of stator teeth.

The invention provides a control method and a control system for a grid-side converter. The method includes: when a modulation ratio is at a first set section, a direct-current bus voltage reference value is limited in a direct-current limit range, when the modulation ratio is at a second set section, the sum of a voltage increment and the direct-current bus voltage reference value is limited in the direct-current limit range; the limited voltage is used as a given value of direct-current bus voltage; the modulation ratio is obtained according to reference voltage and the direct-current bus voltage of a vector pulse width modulation unit. The modulation ratio can reflect voltage values of a power grid, when the modulation ratio is at the first set section, power grid voltage is normal, when the modulation ratio is at the second set section, the power grid voltage is in transient increase, so that the given value of the direct-current voltage is increased, saturation of the modulation ratio is restrained, controllability of the grid-side converter is increased, stable grid-connected operation of the grid-side converter during transient voltage increase is guaranteed, and high-voltage ride through capability of the converter is increased.

An inductance device comprises a drum core having a center core, and flanges integrated therewith. The center core is wound with a wire, whereas a magnetic gap is formed between the upper flange and lower flange. The magnetic gap is closed with an insulator, mixed with a magnetic substance, having rubber elasticity. The insulator comprises an overhang and an insertion integrally formed therewith. The overhang presses a region in the upper flange so as to hang from this region. The insertion tightly fits into the magnetic gap.

A shield incorporates: a first layer, a second layer, a third layer, a first coupling portion, and a second coupling portion. The first layer has: a first surface located in a region of a medium facing surface forward of an end face of a pole layer along the direction of travel of a recording medium; a second surface opposed to the pole layer; and a third surface opposite to the second surface. The second layer touches the third surface. The third layer is disposed in a region sandwiching the pole layer with the first layer. The first coupling portion couples the first layer to the third layer without touching the pole layer. The second coupling portion is located farther from the medium facing surface than the first coupling portion and couples the pole layer to the third layer.

A method and an apparatus for adaptively enhancing a color of an image are provided. The apparatus includes a saturation component deriving unit, a saturation enhancement function determining variable calculator, a saturation enhancement unit, and a saturation component synthesizing unit. The saturation component deriving unit derives a saturation component from an input image. The saturation enhancement function determining variable calculator determines a saturation enhancement function used to enhance the saturation of the input image based upon a predetermined reference value. The saturation enhancement unit changes the derived saturation component using the saturation enhancement function. The saturation component synthesizing unit synthesizes the changed saturation component and other components of the input image and generates an output image based upon the synthesized components.

The invention relates to an interference microscope, in particular to an interference microscope system based on programmable illumination. The interference microscope system based on programmable illumination comprises an illumination light source, an illumination module and a digital micro mirror device, wherein the digital micro mirror device comprises a digital micro mirror array, each digital micro mirror has an n degree deflection angle state and a -n degree deflection angle state, light enters the digital micro mirror device at the incidence angle of 2n degrees through refraction and reflection of a TIR prism, then the on or off state of each micro reflection mirror is controlled, the light is subjected to corresponding spatial modulation, and then the light exits perpendicularly from the digital micro mirror device. The light path enters a Mirau interference objective mirror through reflection of a beam splitter prism, and is split into two light beams through a beam splitter in the Mirau interference objective mirror, the two light beams are irradiated to a reference plane and a detected plane and then are reflected back, and optical interference is formed in the beam splitter. An interference optical field of a detected object returns from the interference objective mirror, passes through the beam splitter prism again, and is received by a detector after passing through a barrel mirror, and an interference image of the interference microscope is obtained.

A shield incorporates: a first layer, a second layer, a third layer, a first coupling portion, and a second coupling portion. The first layer has: a first surface located in a region of a medium facing surface forward of an end face of a pole layer along the direction of travel of a recording medium; a second surface opposed to the pole layer; and a third surface opposite to the second surface. The second layer touches the third surface. The third layer is disposed in a region sandwiching the pole layer with the first layer. The first coupling portion couples the first layer to the third layer without touching the pole layer. The second coupling portion is located farther from the medium facing surface than the first coupling portion and couples the pole layer to the third layer.

A method of controlling an AC machine that includes a stator and a rotor, wherein the method includes, whilst operating the AC machine according to an overmodulation technique: determining a reference speed for controlling the operation of the AC machine; filtering the reference speed such that if the reference speed exceeds a speed limit of the AC machine, the reference speed is reduced towards that speed limit; and controlling the operation of the AC machine based on the filtered reference speed. It has been found that controlling the AC machine in this way helps to inhibit “windup” of a controller used to implement the method, even if the overmodulation technique sets a non-constant maximum voltage.

The invention relates to a PFC inductor saturation suppression circuit and method and power equipment. The circuit comprises a PFC main power circuit, a PFC inductor voltage sampling circuit, a PFC inductor current sampling circuit and a main control module. A PFC inductor value is calculated in real time by detecting voltages at two ends of a PFC inductor and the magnitude of a current which flows through the PFC inductor in real time; the saturation degree of the inductor is judged through the size of the PFC inductor value; and the magnitude of the current which flows through the PFC inductor is controlled according to the inductor saturation degree, so that the target of suppressing PFC inductor saturation is achieved. Only voltage detection circuits are added to two ends of the PFC inductor in the hardware realization aspect; the other operations are achieved through software calculation; and the extra hardware cost does not need to increase. Therefore, compared with an existing PFC inductor saturation suppression technology, the PFC inductor saturation suppression scheme provided by the invention is easy to achieve; and the cost is greatly reduced.

A semiconductor laser device has a striped structure for injecting carriers and includes a first electrically-conductive cladding layer, an active layer, and a second electrically-conductive cladding layer that are formed on a substrate. A width of the stripe changes along a resonator direction, a difference between L1 and Lt is within 200 μm, and Rf<Rr, where L1 is a distance from a front end face to a position at which the width of the stripe is minimal, L is a length of a resonator of the semiconductor laser device, Rf is a reflectivity of the front end face, Rr is a reflectivity of a rear end face, and Lt is a distance expressed by L×Loge(Rf) / Loge(Rf×Rr). The saturation of a light emission efficiency is suppressed in a high power operation, allowing a stable fundamental transverse mode oscillation.

The invention discloses an inductive energy-obtaining device, and the device comprises a housing. The interior of the housing is provided with an inductive energy-obtaining module and a circuit board. The inductive energy-obtaining module comprises an energy-obtaining iron core, an energy-obtaining coil, and a compensation coil. The energy-obtaining coil sleeves a bus of a power distribution cabinet, and the energy-obtaining coil and the compensation coil are disposed on the energy-obtaining iron core in a winding manner. The circuit board is provided with a control module, an overvoltage protection module, a rectification filtering module, a DC-DC module and a voltage-stabilizing module, wherein the overvoltage protection module, the rectification filtering module, the DC-DC module and the voltage-stabilizing module are sequentially connected with the control module. The overvoltage protection module is connected with the inductive energy-obtaining module. The housing is also provided with a through hole for the passing of the bus of the power distribution cabinet. The device can change the connection mode of the energy-obtaining coil and the compensation coil through the control module, enables the inductive energy-obtaining module to be in different energy-obtaining modes, can inhibit the change of magnetic flux, can effectively inhibit the saturation of the energy-obtaining iron core, stabilizes the voltage rectified by the rectification filtering module, and solves a problem that the fluctuation range of a primary side current is large.

A carbon film of the present invention has an elongated needle shape whose radius decreases toward a tip. The shape is, preferably, a shape in which a field concentration coefficient β in the Fowler-Nordheim equation is expressed by h / r where r denotes the radius in an arbitrary position and h denotes height from the arbitrary position to the tip.

The invention provides a high-reliability big-work-range sensing energy taking device based on adjustable impedance. The device comprises an energy taking current transformer (energy taking CT), an adjustable impedance circuit, an AC-DC conversion circuit, a storage battery and a supercapacitor energy management module and an electricity use load. By studying the influence of the secondary side load on the energy taking effect, the mathematical relationship of the active power output by the energy taking CT and the secondary side impedance is built. A method of connecting the adjustable impedance at the secondary side in parallel is used; the obtaining of the required power output when the primary side current changes in a large range is realized through regulating the adjustable impedance. Through a parallel connection resonance mode, the energy CT primary side current threshold value lower limit is reduced; the primary side current threshold value upper limit is improved in an adjustable impedance flow division mode, so that the work range of the energy taking CT can be expanded. The output of the required target power under the condition of large-range fluctuation of the primaryside current of the energy taking CT can be realized according to the mathematical relationship between the output power and the secondary side impedance.

In a photocurrent-to-voltage conversion apparatus for converting a photocurrent flowing through a light receiving element into a detection voltage, an amplifier, a feedback resistor and a clamping MOS transistor are provided. The amplifier has an input connected to the light receiving element and an output for generating the detection voltage, and includes (2n+1) inverter stages connected in series where n is 1, 2 . . . . The feedback resistor and the clamping transistor are connected between the output and input of the amplifier. The clamping MOS transistor is controlled by an output voltage of a non-final inverter one of the inverter stages.

A core is divided by alternately arranging plural magnetic material portions and plural non-magnetic material portions in a circumferential direction of the core through which a primary conductor penetrates. A conductor is wound around the core under conditions in which each core cross section of the core intersects the magnetic material portion and the non-magnetic material portion, each core cross section including a cut end surface of each conductor of a secondary winding wound around the core, and a ratio of a magnetic material portion cross-sectional area of the magnetic material portion to a non-magnetic material portion cross-sectional area of the non-magnetic material portion at the core cross section is kept constant at each core cross section.

An optical receiver preamplifier includes an inverting amplifier 1 and a current-voltage conversion element 2 connected between input and output terminals of the inverting amplifier 1. The inverting amplifier 1 includes a first transistor 3 having a gate connected to the input terminal In of the inverting amplifier 1, a second transistor 4 having a source connected to a drain of the first transistor 3 and a gate to which a predetermined voltage Vb is applied, and a load 5 connected to a drain of the second transistor 4. A third transistor 6 is connected between the input terminal In of the inverting amplifier 1 and a source of the second transistor 4.

A motor control device comprises: a motor control unit; and a signal output unit, wherein the motor control unit controls a motor based on an output signal of the signal output unit, wherein the motor control unit is configured to function as: a first control unit performs a first motor control, in which a current upper limit is estimated based on a rotation speed of the motor and is input to the motor, a second control unit performs a second motor control, in which a second driving current, which is a driving current lower than the first driving current at the end of the first motor control is input, a third control unit performs a third motor control, in which a third driving current to be input to the motor is determined, and a switching unit that sequentially switches the first, second, and third control units.

According to the present invention, a recording magnetic head suitable for increasing a surface recording density and having a large recording magnetic field and a small recording blur is provided. A lower magnetic pole layer and an upper magnetic pole layer opposing the lower magnetic pole layer are formed, and a lower sub magnetic pole composed of a plurality of magnetic layers is formed along a medium facing face on the lower magnetic pole layer. The lengths in a direction perpendicular to the medium facing face of the respective magnetic layers forming the lower sub magnetic pole are longer as the respective magnetic layers get further away from the upper magnetic pole layer.

The invention discloses a high-voltage bus induction power taking device and method. The high-voltage bus induction power taking device comprises an induction power taking device and an electric energy processing device. The induction power taking device is composed of two C-shaped magnetic cores, the bottoms of the two C-shaped magnetic cores are connected through a rotating shaft, protrusions are arranged on upper portions of the two C-shaped magnetic cores, holes are formed in the middles of the protrusions, fastening bolts penetrate through the holes to fix the magnetic cores, heat-resisting rubber pads are arranged at the protrusions, the magnetic cores are not completely closed, and coils are wound in the middles of any sides of the two C-shaped magnetic cores. The electric energy processing device comprises an intelligent discharge module, the intelligent discharge module adopts a single-chip microcomputer to control the on-off of a field effect transistor, and when the output voltage is higher than a certain limit value, an LED cold light source is lightened to release redundant energy. A double-C-shaped opening and closing structure is easy to install, and the gaps can effectively restrain the saturation of the magnetic cores; for energy change generated by current change, excess energy can be released in time, the cold light source is used for preventing temperature rise, and the stability of the induction coil and the circuit voltage is maintained.