Inductive sensor

About: Inductive sensor is a research topic. Over the lifetime, 2282 publications have been published within this topic receiving 21984 citations.

Eddy current brake for motor vehicles

Abstract: The housing hub (5) of an eddy current brake, designed for installation in the drive shaft of a motor vehicle, contains a brake shaft (9) on which is fixed a rotor (6) and which can be coupled to the drive shaft. The housing hub (5) contains the part of an anti-locking device which detects the rotation speed of the brake shaft (9) and controls the excitation voltage of the exciting coils (3) of the eddy current brake. The part which detects the rotation speed is formed preferably of an inductive sensor (51) co-operating with a gearwheel (52) located on the brake shaft (9).

Inductive loop sensors

Abstract: A vehicle presence detection system in which an inductive sensor loop is the frequency-determining element of the tuned circuit of a loop oscillator, wherein discrimination against variations in inductance due to environmental changes is achieved by comparing detect and tracking reference numbers with a sample number that is a function of the oscillator frequency and updating each reference number repeatedly at real time intervals independent of loop oscillator frequency. The current sample number is compared with either the tracking reference or the detect reference according to whether or not the system is indicating the presence of a vehicle. In the case of the tracking reference, if the difference between it and the sample is no greater than a threshold value, each reference is updated by repeatedly incrementing or decrementing it by a predetermined amount for a number of times determined by the time that has elapsed since the last comparison cycle, but if the difference is greater than the threshold, indicating a vehicle movement, the tracking reference is immediately made substantially equal to the sample in one step. Both the threshold values and the predetermined amounts of increment or decrement may be different for different directions of change.

Apparatus and method for alignment of elevator guide rails

Abstract: The apparatus includes a stationary part being attachable to an elevator guide rail element at a predetermined height above a joint between two consecutive end-on-end mounted elevator guide rail elements. An elongated measuring frame having an upper end and a lower end is supported from the upper end with an articulated joint at the stationary part. A number of inductive sensors are positioned on the measuring frame, whereby at least a part of the inductive sensors are directed in a first direction being the direction between the guide rails towards a tip of the guide rail elements, said part being further divided into two sub parts so that a first sub part of the inductive sensors is directed towards the upper elevator guide rail element and the rest are directed towards the lower elevator guide rail element. The apparatus further includes a connection board for the inductive sensors, a visualization device, electronics, and a power source.

Workpiece i.e. sheet plate, gripping and retaining device, has energy generator, and piston slidably supported between rest position and operating position in cylinder, where sensors detect position and presence of workpiece and piston

Abstract: The device (10) has a cylinder (20) arranged in a housing (16). A piston (22) forms permanent magnets (26), and is pivoted between a rest position and an operating position in the cylinder. The piston lies or lies close to a cylinder base in the operating position. A workpiece (12) is contacted by the base. An energy generator, an energy storage (52) and sensors (38, 40, 42) are provided, where the generator is a solar cell, induction generator, heat or vibration transducer, piezo element or a turbine. The sensors detect position and presence of the workpiece and the piston. The sensors can be selected from the group consisting of a contactless or tactile sensor, switch, temperature sensor, pressure sensor, flow sensor, capacitive sensor or inductive sensor.

Method and apparatus for sensing proximity or position of an object using near-field or magnetic effects

Abstract: A method and apparatus for sensing proximity of an object using near-field effects or magnetic effects. The sensor chips are designed to accommodate numerous sensing elements. In the electromagnetic sensor, radio frequency energy is fed to an antenna. The antenna radiates this radio frequency energy to charge the surface of an object. When the position of the object changes, the impedance of the antenna due to near-field effects changes. This impedance change is detected to provide an indication of the object's movement. In the magnetic sensor, the sensing element is placed at a right angle to the sensor electronics to provide a smaller surface area across the diameter of the sensor. The magnet that charges the object to be detected is manufactured as a part of the sensor encapsulant. The sensing device may be packaged to be inserted into a wall to provide a sensor having a leakfree seal.