7 results about "Search coil" patented technology

A fully integrated micro search coil magnetometer (μSCM) with a low-noise instrumentation amplifier is provided for low-frequency magnetic field measurements in the range of 1Hz to 1kHz. A micro search coil formed by stacking planar spiral inductors and serially connecting them with an in-phase configuration is used for magnetic field measurements. The critical line width and inner diameter of a planar spiral inductor are theoretically calculated and experimentally verified, enabling the development of a unique CMOS layout. This layout incorporates the calculated critical inner diameter, significantly optimizing the area utilization on the CMOS die. Additionally, the CMOS die includes a polysilicon-layer inductor for on-chip calibration, a Hall effect sensor for DC magnetic field measurement, and a temperature sensor for enhanced functionality. The μSCM delivers a compact, energy-efficient, and highly sensitive solution for low-frequency magnetic field measurements, surpassing the performance of most commercially available Hall effect sensors.

A wireless power transmission device comprises power transmission coils, first search coils, second search coils, and a position sensing device. The position sensing device outputs a pulse signal to the first and second search coils and receives an echo signal from a power transmission device via the first and second search coils. The position sensing device detects the position of a power receiving coil of the power transmission device, which is placed on a loading platform, based on the detection voltages of the echo signal in the first and second search coils. When power is transmitted to the power receiving coil via one of the power transmission coils, the position sensing device sets the first and second search coils, as disabled coils, to be positioned within a predetermined distance of the power receiving coil.

An embodiment of the present application provides a technique for measuring the position, displacement, and the like of a ferrous object, capable of preventing detection lag due to a range in which the magnetic field is temporarily weakened (a non-polarity range) when a polarity change occurs with respect to the sensor as the ferrous object is displaced. An object non-polarity correction and displacement measuring device using a probe coil type sensor according to an embodiment of the present application includes a plurality of sensors each having a housing having an internal space, a core formed to be introduced into the internal space of the housing, and a coil wound around a portion of an outer peripheral surface of the housing corresponding to the position of the core. The plurality of sensors are arranged in parallel, respectively, and the winding positions of the core and the coil with respect to one housing are different from the winding positions of the core and the coil with respect to the other housing, and an induced magnetic field is formed in accordance with a change in distance from a ferrous (Fe) object.

A detection system is provided for detecting entry of a target object into a protected area. The detection system includes a control unit and a search coil assembly comprising a plurality of search coil units in electronic communication with the control unit and extending continuously around a perimeter of the protected area to define a detection zone. The plurality of search coil units each comprise a transmitting coil and a receiving coil, wherein the transmitting coil is adapted to transmit an electromagnetic signal of a predetermined value, and the receiving coil is adapted to receive the electromagnetic signal, thereby generating an electromagnetic field. The control unit is configured to identify and initiate an emergency response condition in response to variations in the electromagnetic field corresponding to entry of the target object into the protected area via the detection zone.

A hybrid magnetometer and attitude determination and control system (hybrid magnetometer attitude determination and control system). Many scientific and commercial satellites in low-Earth orbit (LEO) use attitude determination and control systems that enable control and knowledge of the spacecraft's attitude (the orientation the spacecraft). The hybrid magnetometer and attitude determination and control system is a single package that can be integrated into small satellites, such as CubeSats, and consists of a three-axis search coil AC magnetometer and three-axis quad-mag DC magnetometer. The search coil sensors also act as torque rods for part of the orbit. Noise cancellation algorithms enable scientific grade magnetic measurements from the system without needing a sensor boom.

A hybrid magnetometer and attitude determination and control system (hybrid magnetometer attitude determination and control system). Many scientific and commercial satellites in low-Earth orbit (LEO) use attitude determination and control systems that enable control and knowledge of the spacecraft's attitude (the orientation the spacecraft). The hybrid magnetometer and attitude determination and control system is a single package that can be integrated into small satellites, such as CubeSats, and consists of a three-axis search coil AC magnetometer and three-axis quad-mag DC magnetometer. The search coil sensors also act as torque rods for part of the orbit. Noise cancellation algorithms enable scientific grade magnetic measurements from the system without needing a sensor boom.

The invention discloses a motor stator local loss measuring device and method, and belongs to the technical field of motor stator core manufacturing and testing. The problems that in the prior art, stator core local alternating current loss measurement is low in precision and complex in system, and the local loss distribution condition under the actual working condition cannot be comprehensively and accurately reflected are solved. According to the invention, an openable C-shaped magnet yoke structure formed by splicing two non-oriented silicon steel iron cores is used as an auxiliary iron core, and the auxiliary iron core is in close contact with a tested motor stator iron core, so that a local closed magnetic circuit is formed; an excitation winding is wound on an auxiliary iron core, and alternating current is introduced, so that an alternating magnetization phenomenon is generated in a detected area; then, the magnetic flux density change of the area is sensed by using a search coil, and the specific loss of the measured area is accurately calculated in combination with a signal processing system; according to the method, the local loss of the stator core can be accurately measured, the spatial distribution characteristics of the stator core can be deeply analyzed, the operation is simple, convenient and efficient, and a new scheme is provided for motor stator loss measurement.