The invention relates to a system comprising a coder that has an alternation of North and South magnetic poles separated by transitions extending along a helix of pitch p and of angle α, the magnetic track having N.sub.pp pairs of North and South poles and a polar width L.sub.p measured along a normal to the transitions which are: N.sub.pp=πa/l and L.sub.p=p.Math.cos α. The invention also includes at least one sensor able to detect the rotating magnetic field in a plane perpendicular to the magnetic track and to the transitions by means of a mounting of at least two sensitive magnetic elements. The mounting being disposed at a radial reading distance from the magnetic track and being arranged to deliver signals in quadrature.

A circuit assembly for monitoring a sinusoidal alternating voltage signal having a comparing element receiving at an input the signal with period T and generating a first output signal at an output based upon the signal exceeding a threshold; a zero crossing detector receives at its input the signal and generates a output signal at its output; a timing element connected to zero crossing detector generates a clock signal dependent on the second output signal; and a flip-flop. The comparing element output is connected to a state-controlled input of the flip-flop and the timing element output is connected to an edge-controlled input of the flip-flop. The flip-flop generates a state signal at its output. The timing element specifies a state change of the clock signal at an instant that differs from the instant at T/4 after a zero crossing of the signal.

A sensor device comprises at least one test magnet which is designed to provide a magnetic test field, a first sensor element which is designed to capture a magnetic field and to provide a first sensor signal, wherein the first sensor signal comprises a first signal contribution on the basis of the magnetic test field, a second sensor element which is designed to capture a magnetic field and to provide a second sensor signal, wherein the second sensor signal comprises a second signal contribution on the basis of the magnetic test field, wherein the magnetic test field at the location of the first sensor element differs from the magnetic test field at the location of the second sensor element.

The torque motor as disclosed depends on decreasing the gap between a surface on a fixed part and a corresponding inclined facing surface on a rotating part, where the gap width is proportional to its distance from the angle vertex, in magnifying the electromagnetic force and its resulting torque. Therefore, the surface on the fixed part starts directly ator close toa point in align with the rotating part center of rotation, and hence the gap width is minimum at the start point and increases away from this point due to the inclination angle. The motor includes features, such as, utilizing many pairs of facing surfaces, many electromagnetic circuits; arrange the surfaces in pairs for balanced forces, works in one or two directions, the two directions electromagnetic circuits installed in one or two levels, and precautions and ways to avoid magnetic field interference and leakage.

A magnetic field sensor for sensing motion of a ferromagnetic object comprises a substrate. The substrate includes first and second major surfaces, each having a width dimension and a length dimension. The magnetic field sensor further comprises a magnet. The magnet includes a first major surface proximate to the substrate, the first major surface of the magnet heaving a width and a length, and a second major surface. The magnetic field sensor further includes first and second magnetic field sensing dements. The first magnetic field sensing element and the second magnetic field sensing element are positioned beyond respective ends of the width of the magnet. The second magnetic field sensing element is substantially farther from the ferromagnetic object than the first magnetic field sensing element. A line passing through the first and second magnetic field sensing elements is perpendicular to the magnet axis.

According to one aspect, embodiments of the invention provide a system for monitoring a plurality of circuit branches coupled to an input line, the system comprising a communication bus, a controller having a primary clock with a first clock value and configured to sample voltage on the input line based on the first clock value, a plurality of sensor circuits, each sensor circuit having a secondary clock with a second clock value and configured to sample current in the at least one of the plurality of circuit branches based on the second clock value, and wherein the controller is further configured to initiate, via the communication bus, synchronization of at least one secondary clock and the primary clock, and to synchronize, via the communication bus, the at least one secondary clock and the primary clock to account for transmission latency in the communication bus.

The torque motor in this patent depends on decreasing the gap between a surface on a fixed part and a corresponding inclined facing surface on a rotating part, where the gap width is proportional to its distance from the angle vertex, in magnifying the electromagnetic force and its resulting torque. Therefore, the surface on the fixed part starts directly ator close toa point in align with the rotating part center of rotation, and hence the gap width is minimum at the start point and increases away from this point due to the inclination angle. The motor may have various features such as utilizing many pairs of facing surfaces, many electromagnetic circuits; arrange the surfaces in pairs for balanced forces, works in one or two directions, the two directions electromagnetic circuits installed in one or two levels. Precautions and ways to avoid magnetic field interference and leakage should be considered.

A power detector measures RF power delivered into a first load of uncertain impedance. A reference power meter measures power of a reference signal to a second load of known impedance. The reference power meter measures voltage across the second load; measures a current through the second load; and multiplies the measured voltage by the measured current to generate a reference power signal proportional to power delivered to the second load. A measurement power meter measures power of a signal to the first load. The measurement power meter measures voltage across the first load; measures current through the first load; and multiplies the measured voltage by the measured current to generate a measured power signal proportional to power delivered to the first load. The power detector includes a processor to calculate power delivered to the second load, and to generate a power delivered to the first load.

The invention relates to a sensor assembly (10) for detecting rotation of a shaft about an axis of rotation (12), said sensor assembly having a housing (24) in which at least one magnetic field sensor (14) is arranged. The at least one magnetic field sensor (14) is designed to acquire a variation in a magnetic field generated by a magnet device (16) in the sensor assembly (10), which variation is associated with the rotation of the shaft about the axis of rotation (12). A shield device (30) arranged on the housing (24) is provided to shield the at least one magnetic field sensor (14) from the surroundings (28) of the sensor assembly (10). The shield device (30) can be removed from the housing (24), with the shield device (30) being retained on the housing (24) by means of a latching connection.

A method for measuring electric power loss of a high voltage direct current (HVDC) system comprises the steps of measuring the amount of transmission electric power and the amount of receiving electric power; calculating a first electric power loss amount based on a difference value between the measured amount of the transmission electric power and the measured amount of the receiving electric power; calculating the amount of loss generated in each of positions in the HVDC system based on an impedance value of each of the positions; calculating a second electric power loss amount based on a sum value of the calculated loss amounts; and determining a correcting value for correcting the amount of electric power loss generated in the HVDC system based on a difference value between the first electric power loss amount and the second electric power loss amount.