A processor-implemented method based on an acceleration sensor and a geomagnetic sensor for determining an angular velocity of an object includes: deriving a state variable and a variance of the state variable based on an error quaternion and converting a quaternion-based rotation matrix into an error quaternion-based rotation matrix; calculating an observation matrix and an output matrix of the Kalman filter based on the error quaternion-based rotation matrix; calculating a gain of the Kalman filter based on the transferred variance of the state variable and the observation matrix of the Kalman filter after transferring the state variable and the variance of the state variable through a discretized transfer matrix; calculating a quaternion-based on a calibrated state variable and an estimated quaternion after calibrating the state variable and the variance of the state variable through the gain of the Kalman filter; and calculating angular velocity based on the quaternion.

A calibration system includes an excitation module that introduces an excitation signal to a primary coil of a differential transformer, a measurement module that measures, at a first phase shift, a positive value of an induced signal. The induced signal is caused by the excitation signal on a secondary coil of the differential transformer. The system further includes a calculation module that compares the positive value to a last positive value to form a compared positive value, and a calibration module that changes the first phase shift based on the compared positive value.

The present invention provides an actuator including a motor; a lead screw rotating by coupling to the motor; a nut part moving forward or backward by coupling to the lead screw; a magnet coupled to the nut part; a sensor unit configured to sense a change amount of magnetic flux depending on a position of the magnet and convert the sensed change amount of magnetic flux into measured voltage data; and a control unit controlling the motor; wherein the magnet comprises a first pole and a second pole arranged in order in the movement direction of the nut part, wherein, if the sensor unit senses the first pole when the nut part is moved forward, the control unit performs a first motion in which a forward movement of the nut part is stopped and moves the nut part backward, and if the sensor unit senses the second pole after the first motion, the control unit performs a second motion in which the movement of the nut part is stopped and moves the nut part forward.

The invention relates to a method for controlling the production of a magnet (12) using a sensor able to emit a presence signal for a magnetic induction and defining a measuring axis, the magnet (12) being a permanent magnet with symmetry of revolution relative to its axis, called mechanical axis, the magnet (12) having a center and a maximum dimension, the method comprising at least the following step: a) performing a first measurement of a component of the magnetic induction produced by the magnet u(12) sing the sensor, b) performing a second measurement of a component of the magnetic induction produced by the magnet (12) using the sensor, and c) calculating the angular deviation of the equivalent magnetic moment of the magnet (12) from the first measurement and the second measurement.

The present invention provides an actuator including a motor; a lead screw rotating by coupling to the motor; a nut part moving forward or backward by coupling to the lead screw; a magnet coupled to the nut part; a sensor unit configured to sense a change amount of magnetic flux depending on a position of the magnet and convert the sensed change amount of magnetic flux into measured voltage data; and a control unit controlling the motor; wherein the magnet comprises a first pole and a second pole arranged in order in the movement direction of the nut part, wherein, if the sensor unit senses the first pole when the nut part is moved forward, the control unit performs a first motion in which a forward movement of the nut part is stopped and moves the nut part backward, and if the sensor unit senses the second pole after the first motion, the control unit performs a second motion in which the movement of the nut part is stopped and moves the nut part forward.

The present invention provides a linear actuator including a motor; a linear driving unit coupled to the motor and including a magnet; a sensor unit configured to sense a change amount of magnetic flux depending on a position of the magnet and convert the sensed change amount of magnetic flux into measured voltage data; a data unit in which reference voltage data corresponding to the change amount of magnetic flux depending on a position of the magnet is stored; and a judging unit configured to compare the reference voltage data with the measured voltage data at the corresponding position of the magnet. The present invention is advantageous in that, by compensation-controlling a position of the motor, feedback control may be performed in the step motor to secure performance of the product to which the present invention is applied.

An electromagnetic apparatus (EMA) for measuring electromagnetic properties of an electrical conductor such as a power cord is provided. Methods of using the EMA are also provided. The EMA includes a plurality of electromagnetic sensors (EMSs) disposed in an array along a length and a width of the EMA. The EMA further includes circuitry such as a microprocessor, communication circuitry, and power circuitry. The circuitry is in electrical communication with the EMSs.

A susceptometer includes: a substrate; a plurality of electrodes including: a first pair of electrodes disposed on the substrate; a second pair of electrodes disposed on the substrate, the second pair of electrodes arranged collinear with the first pair of electrodes to form a set of aligned electrodes; and a third pair of electrodes disposed on the substrate, the third pair of electrodes arranged noncollinearly with set of aligned electrodes; and a solenoid circumscribingly disposed around the electrodes to: receive the sample such that the solenoid is circumscribingly disposed around the sample; receive an alternating current and produce an primary magnetic field based on the alternating current; and subject the sample to the primary magnetic field.

An object of this invention is to sense a transient displacement of the blade position to thereby detect abnormalities early. The invention includes: one or more first sensors mounted so as to be removable from an outer surface of a casing opposed to blade tips; a second sensor for acquiring a signal from a fixed point on a rotor shaft of the blades; a section configured to extract data groups from an output signal of the first sensor on the basis of information acquired by the second sensor; a section configured to average the data groups; a section configured to determine thresholds from averaged data obtained under a healthy condition; and an assessing section configured to compare magnitude of the thresholds and sensor signals obtained during blade status monitoring. Since a transient displacement of blade position can be sensed, abnormalities can be detected early in this invention. This early detection, in turn, enables a rotation to be stopped during an initial phase of blade damage. The invention is therefore advantageous in minimizing impacts on other devices.

An electromagnetic apparatus (EMA) for measuring electromagnetic properties of an electrical conductor such as a power cord is provided. Methods of using the EMA are also provided. The EMA includes a plurality of electromagnetic sensors (EMSs) disposed in an array along a length and a width of the EMA. The EMA further includes circuitry such as a microprocessor, communication circuitry, and power circuitry. The circuitry is in electrical communication with the EMSs.