Class / Patent application number | Description | Number of patent applications / Date published |
324163000 | Including speed analog electrical signal generator | 9 |
20100117627 | MEASURING LINEAR VELOCITY - An apparatus for measuring linear velocity of a movable element relative to a stationary element includes a magnetic element fixed in relation to the stationary element. A soft-magnetic yoke is fixed in relation to the movable element to move with the movable element and is in non-contact relation with the magnetic element. A yoke pole is positioned proximate to the magnetic element and spaced therefrom by an air gap. The pole is magnetically coupled to the magnetic element so that a magnetic flux is generated in the air gap substantially orthogonal to the axis of motion. A conductive coil is coiled around a coil axis and is fixed in relation to the stationary element with the coil axis substantially parallel to the axis of movement. The coil is in non-contact relation with the yoke and resides between the magnetic element and the pole of the yoke in the magnetic flux. | 05-13-2010 |
20120153935 | Systems, Methods, and Devices for Demodulating Induction Motor Instantaneous Rotor Slot Harmonic Frequency - A method and apparatus to dynamically and adaptively demodulate induction motor instantaneous rotor slot harmonic frequency for line-connected squirrel-cage polyphase induction motors. The instantaneous rotor slot harmonic frequency carries essential information on the instantaneous rotor speed. Based on a correlation between the motor's input power and its rotor slot harmonic frequency, a dynamically varying carrier frequency is computed and used in a rotor slot harmonic frequency detector. The rotor slot harmonic frequency detector is based on a superheterodyne principle. It contains a generalized linear-phase low-pass filter, whose bandwidth is estimated dynamically by a filter bandwidth estimator. The rotor slot harmonic frequency detector also includes a latency compensator, which receives the dynamically varying carrier frequency signal and synchronizes it with the output of a frequency demodulator. | 06-21-2012 |
20130069633 | FAN SPEED DETECTION DEVICE - A fan speed detection circuit includes a counter, an integrating circuit, a current regulation circuit, a connector and a matching circuit. The connector electrically connects to the current regulation circuit and a fan. The counter outputs a pulse signal, the integrating circuit receives the pulse signal from the counter, and converts the pulse signal from the counter into a corresponding analog command signal. The current regulation circuit adjusts the current from the integrating circuit according to the command signal and outputs the adjusted current to the connector. The matching circuit converts the voltage from the connector and provides a suitable voltage for activating the counter to enable the counter to detect and quantify and record the rotation speed of the fan in all circumstances. | 03-21-2013 |
20140002060 | BICYCLE ROTATION DETECTING DEVICE | 01-02-2014 |
20140266156 | Aircraft Wheel Speed Sensor - In some aspects of what is described herein, an aircraft wheel speed sensor system includes a pair of conductors coupled between an electro-mechanical system and a control system. The control system is configured to apply a carrier voltage signal to the pair of conductors and to detect a modulated current signal on the pair of conductors. The electro-mechanical system includes a stator and a rotor that moves upon rotation of an aircraft wheel. The stator includes a winding disposed about the rotor. The winding is configured to produce the modulated current signal on the pair of conductors in response to movement of the rotor. The modulated current signal has a frequency that is dependent on a rotational speed of the aircraft wheel. | 09-18-2014 |
20150309066 | Underspeed detection device, associated ventilation system and vehicle - The invention relates to an underspeed detection device ( | 10-29-2015 |
20160061856 | ELECTROMAGNETIC BOAT SPEEDOMETER HAVING BOUNDARY LAYER VELOCITY COMPENSATION - An electromagnetic boat speedometer includes a boundary layer velocity compensating arrangement comprising a primary coil for producing a primary electromagnetic field within a relatively large first volume of water, a secondary coil for producing a secondary electromagnetic field within a relatively small portion of the first volume of water immediately adjacent the hull of the boat, and a set of first electrodes removably mounted in one or more openings in the hull of the boat, such that the tips of the first electrodes extending into the relatively small water portion. In one embodiment, the coils are simultaneously energized in opposition, so that the primary and secondary electromagnetic fields are in opposition. In a second embodiment, the coils are energized alternately, and the signals produced by the electrodes are modified to achieve the desired boundary layer compensation. A second set of second electrodes may be included in the second embodiment. | 03-03-2016 |
324164000 | Eddy current generator type (e.g., tachometer) | 1 |
20100052659 | HIGH TEMPERATURE ELECTRONICS FOR PASSIVE EDDY CURRENT SENSORS - A system and method for sensing the periodic proximity of one or more objects, such as the rotating blades of a gas turbine. The system includes a passive eddy current sensing unit having first and second magnets and first and second coil-wound cores coupled to generate and detect first and second magnetic fields. The sensing unit is positioned relative to the object such that the first and second coil-wound cores produce outputs in response to the object periodically passing through the first and second magnetic fields, respectively. Circuitry electronically combines the outputs of the first and second coil-wound cores to produce output signals corresponding to the proximity and timing of the object as it periodically passes through the first and second magnetic fields. Electromagnetic interference noise present in the outputs of the first and second coil-wound cores is eliminated from the output signals of the circuitry. | 03-04-2010 |
324165000 | With direction indicator | 1 |
20100060262 | ROTATIONAL DIRECTION DETECTOR AND METHOD FOR DETERMINING THE DIRECTION OF ROTATION OF A WHEEL - A rotational direction detector is specified which is provided for mounting to a circumferential segment of a wheel having at least one sensor, wherein a change in the output signal of the sensor occurs when the circumferential segment enters and/or leaves the wheel contact area. Furthermore a method is specified for determining the direction of rotation of a wheel, wherein the signal change is determined and a rotational direction signal is derived therefrom. | 03-11-2010 |