183 results about "Ac resistance" patented technology

An apparatus (10) is set forth for measuring a return signal of a magnetostrictive sensor (20) that detects a force, torque, or pressure. The return signal includes noise, a DC resistance (44), an AC resistance and an inductance and the inductance is shifted ninety degrees from the AC resistance. The apparatus (10) includes a sensor filter (22) to remove the noise from the return signal. A sensor filter (22) shifts the return signal and more specifically, the inductance by an additional angle and the sum of the additional angle and the ninety degrees phase shift is defined as the final detection angle. To detect the inductance at the final detection angle, a wave filter (16) and a reference filter (28) shifts a reference signal by the final detection angle to trigger a first demodulator (26) to detect the inductance at the final detection angle. The inductance detected by the first demodulator (26) varies due to temperature. To remove the temperature from the measured inductance, the apparatus includes a DC detection circuit (42) to detect the DC resistance which is proportional to the temperature across the sensor (20). The DC resistance and the measure inductance are inserted into a correction equation to produce a corrected inductance which is independent of temperature. Instead of inductance, an AC resistance may be used in the equation.

The invention belongs to the technical field of overhead conductors of electric transmission lines, and particularly relates to an intermediate strength aluminum alloy wire for an overhead conductor. According to the intermediate strength aluminum alloy wire provided by the invention, solution treatment is effectively carried out on an aluminum alloy rod and subsequent aging treatment realizes a better effect through certain alloy composition adjustment, rolling and control of online quenching, so that the intermediate strength aluminum alloy wire with the elongation which is not less than 3.5%, the electric conductivity which is not less than 58.5%IACS (International Annealed Copper Standard) and the tensile strength which is not less than 245MPa is finally obtained. The elongation of the intermediate strength aluminum alloy wire provided by the invention is remarkably superior to that of aluminum alloy wires in the prior art. The intermediate strength aluminum alloy wire has the advantages that the wire is great in pulling weight ratio, good in sag characteristic, good in high temperature characteristic and damage- resistant in the surface. As no steel cores are available, magnetic hysteresis loss and eddy loss are avoided. In operation, the alternating current resistance of the wire is lower than that of aluminum cable steel reinforced, so that the electric energy loss is reduced. The intermediate strength aluminum alloy wire provided by the invention is used more and more in electric transmission lines and has a wider range of application.

A magnetic device of smaller size and lower profile comprising a coil conductor of high inductance and low resistance is provided. The magnetic device comprises a coil conductor and a multilayer magnetic layer formed so as to cover the periphery of the coil conductor. Further, a magnetic device having higher inductance value and lower conductor resistance value (AC resistance) by selecting a magnetic layer capable of suppressing the eddy current and having excellent magnetic characteristics even designed with smaller size and lower profile.