43results about How to "Increase electrical size" patented technology

The invention discloses an electromagnetic scattering simulation method based on parallel moment method and physical optics mixing to mainly solve the problem that when electrically large models are processed in the prior art, the simulation efficiency of electromagnetic scattering and the precision are low. The electromagnetic scattering simulation method comprises the steps that a rough surface power spectrum and rough surface parameters are input, and a rough surface is simulated based on the Monte Carlo method; geometric modeling is carried out on a radar target through 3dsMax software, and the subdivided radar target is output; a combined model is formed by combining the rough surface and the radar target, the rough surface is divided into a physical optics area, and the radar target is divided into a parallel moment method area; induced currents on the rough surface and induced currents on the surface of the radar target are obtained; a far scattered field of the combined model is calculated based on the induced currents on the surface of the combined model, a radar cross section of the combined model is obtained, and simulation between the rough surface and the combined electromagnetic scattering of the radar target is achieved. According to the electromagnetic scattering simulation method, the memory consumption is little, the simulation efficiency is high, and the electromagnetic scattering simulation method can be used in the study on the rough surface and the radar target combined electromagnetic scattering character in the field of national defense and the civil using.

An electric motor includes a rotor shaft arranged in a casing and having an axial hollow bore formed therethrough for passage of lubricating oil, a rotor, a stator, a pair of bearings each having an inner race and an outer race, a pair of bearing fixing parts supporting the rotation of the rotor shaft, and bearing cooling devices each having a cylindrical heat dissipation portion fixedly secured to the rotor shaft so as to be in contact with either one of end faces of the individual inner races, the heat dissipation portion extending from the one end face of each inner race to a side opposite to the bearings. A pair of spaces between rotor-side end faces of the bearings and the bearing fixing parts, respectively, are in communication with ring gaps between the heat dissipation portions and the rotor shaft, respectively, through radial communication holes in the rotor shaft.

A card edge connector assembly includes a circuit board, a connector, an electrical card and a fixing structure. The connector is formed on the circuit board, the front rim of the electrical card is inserted into the insertion slot of the connector. The fixing structure has an elastic element having a fixing portion positioned on the circuit board. Two relating opposing sides of the fixing portion extends two elastic arms whose free ends form a beveled edge and a clasp portion, and define positioning slots on the rear rim of the electrical card. The length of the elastic arm increases in such a way that the elasticity of the elastic arm becomes greater so as to prevent the elastic arm abrading and breaking to ensure the positioning function and enhance the shock-resistance.

The objective of the present invention is to provide a power source and operational method in which a plurality of inverters are connected in parallel with the ability to suppress the crosscurrent with a very simple means. The present invention is an electric power source in which a plurality of inverted operate on the same frequency and the plurality of inverters are connected in parallel so that a resistance value expressed by (1−β·G)/(α·G) here α is the output voltage feedback gain, β is the output current feed forward gain, and G is the inverter current gain, is made to be the equivalent output impedance; and is an electrical power source in which the cross-current between the inverters are made to be an acceptable value or below by adjusting the output of each of the inverters by controlling the equivalent output impedance by modifying both or either one of the output voltage feedback gain α or the output current feed forward gain β.

A power transmission configured with a mechanical pump that generates and deliver a fluid pressure to a clutch. An electromagnetic pump generates and delivers a fluid pressure to the clutch, and an accumulator connects the clutch and the electromagnetic pump, and accumulates fluid pressure acting there between. A switching valve selectively switches between connecting the mechanical pump side and the clutch in a fluid communicating manner and connecting the electromagnetic pump and the clutch in a fluid communicating manner. A valve drive portion that drives the switching valve so as to connect the mechanical pump side and the clutch when the mechanical pump is driving, and drives the switching valve so as to connect the electromagnetic pump and the clutch when the electromagnetic pump is driving in place of the mechanical pump.

A BBW type brake system which operates fluid pressure generators having electric motors as drive sources based on an electrical signal to brake a wheel, field weakening control of the electric motors is performed in the initial stage of operation of the fluid pressure generators to increase the rotational speed of the electric motors. Therefore, it is possible to reduce a time lag before the braking force actually generates after the electrical signal for operating the fluid pressure generators is outputted, thereby improving operational responsiveness. After the braking force actually generates, the field weakening control is cancelled to secure a required braking force with a sufficient torque.

An electrical connector includes a housing having a first sidewall surface and a second sidewall surface extending in a first direction in parallel to each other with a first distance therebetween; a first terminal having a first contact portion protruding from the first sidewall surface in a second direction substantially perpendicular to the first direction; a second terminal having a second contact portion protruding from the second sidewall surface; and an extension portion having a first external wall surface and a second external wall surface. The extension portion is arranged so that a center point between the first external wall surface and the second external wall surface is shifted with respect to a center point between the first contact portion and the second contact portion. The first external wall surface extends in parallel to the second external wall surface with a second distance larger than the first distance.

An electric steering apparatus includes a brushless motor 3 which applies torque to a steering system through a speed reduction mechanism 4, and a resolver 7 which detects a rotation angle of the output shaft 31 of the brushless motor 3. The resolver 7 is arranged between the brushless motor 3 and the speed reduction mechanism 4 in a manner separately from the body 32 of the brushless motor 3.

Featured is a resistance heater air heating device that includes a low thermal conductivity enclosure and an electric resistance heater that is disposed within such an enclosure. In more particular embodiments, such an enclosure is configured so as to provide a high surface area which in combination with the heater heats the air passing through the enclosure. In more particular embodiments, the ceramic enclosure is configured and arranged so as to include a through aperture in which is disposed the electric resistance heater and through which the air flows along the length of the through aperture.

The invention relates to a fractal yagi printed antenna of coplanar waveguide feed, which relates to a yagi printed antenna, and in particular to a fractal yagi printed antenna of coplanar waveguide feed. The invention aims at solving at solving the problems of the miniaturization and mass production of the antenna and the integration of a communication circuit caused by the large and complicated size of a guide antenna. The fractal yagi printed antenna is characterized in that a first printed metal floor board and a second printed metal floor board are arranged on the lower part of one side surface of a medium plate in a linear way, a guide device, an active vibrator and a reflector are sequentially installed on one side surface of the medium plate from left to right, both a left arm and a right arm on the lower part of the active vibrator are arranged between the first printed metal floor board and the second printed metal floor board, the lower part of the guide device is connected with the first printed metal floor board into a whole, the lower part of the reflector is connected with the second printed metal floor board into a whole, and a coplanar waveguide feed port is arranged between the first printed metal floor board and the second printed metal floor board. The fractal yagi printed antenna is used for the technical field of radio.

A design method for designing a multi-path amplifier involves connecting an amplifier stage having at least two amplifier branches to a combiner stage; feeding a plurality of testing signals with one or more of a plurality of sweeping variables to the amplifier stage; measuring output signals at the output of the combiner stage depending on the plurality of testing signals; designing a structure of an input network stage for the amplifier stage on the basis of the measured output signals; and combining the designed input network stage with the amplifier stage to create an efficiency-optimised multi-path amplifier.

A heat sink plate is mounted on an electronic device for heat radiation of the electronic device. When the fundamental wave or a harmonic wave of the clock signal of the electronic device is coincide with the size of the heat sink plate, the heat sink plate resonates and large clock signal harmonic wave noise is radiated. For suppressing the noise, a dielectric strip is mounted on an edge portion of the heat sink plate. By this dielectric strip, the resonance frequency of the heat sink plate varies so that the resonance can be suppressed.