摘要:
The present inventions, in one aspect, are directed to a portable monitoring device to calculate a number of stairs or flights of stairs traversed by a user, the portable monitoring device comprising (i) a motion sensor to detect motion of the user and, in response thereto, to generate data which is representative of motion of the user, (ii) an altitude sensor to detect a change in altitude of the user and, in response thereto, to generate data which is representative of the change in altitude of the user, and (iii) processing circuitry, coupled to the motion sensor and the altitude sensor, to calculate a number of stairs or flights of stairs traversed by the user using the data which is representative of motion of the user and the data which is representative of a change in altitude of the user. The portable monitoring device may include a housing having a physical size and shape that is adapted to couple to the body of the user.
摘要:
The present inventions, in one aspect, is an activity monitoring system comprising a fixture having size/shape adapted to couple to a location on the user's body and a particular signature; and a portable monitoring device adapted to detect the fixture's particular signature. The monitoring device includes a housing that is adapted to engage the fixture; activity sensors, disposed in the housing, to detect activity of the user and to generate data which is representative of the activity of the user; and processing circuitry, disposed in the housing, to calculate an activity-related quantity of the user using the data which is representative of the activity of the user, wherein the processing circuitry: determines the monitoring device is engaging the fixture by detecting the fixture's particular signature, and, in response thereto, calculates the activity-related quantity using data from a set of the activity sensors.
摘要:
A highly simply technical transmitter system for a Ferraris movement transmitter, wherein several magnetic field generators (M1,M2,M3) form at least one magnetic circuit with a moveable, non-magnetic electrically conducting rotating measuring body and speed-dependent or acceleration-dependent output signals can be generated by means of magnetic field sensors coupled thereto, embodied in such a way that a preferably cylindrical device shaft (W1,W2,W3) is provided as a measuring body.
摘要:
Apparatuses and methods for monitoring microfeature workpiece rotation during processing, such as brushing, by monitoring characteristics corresponding to a state of a magnetic field proximate to the rotating microfeature workpiece are disclosed herein. The characteristic can depend on the relative motion between the magnetic field and the conductive material of the microfeature workpiece. The characteristic can include the strength of the magnetic field, current in an electromagnet circuit used to create the magnetic field, force exerted on the magnetic field source, or movement of the magnetic field source. The apparatus can include a feedback control device to adjust the rotation speed of the microfeature workpiece based on the characteristic detected.
摘要:
A measurement system for determining acceleration and a position of an object. The measurement system includes a first sensor system for determining an acceleration of an object, the first sensor having a body with an electrically conducting measuring structure, a device for generating a first magnetic field, which acts on the measuring structure and a detector for detecting a second magnetic field or field changes, which are created by eddy currents generated by the measuring structure, the detector generating an output signal. A second sensor system for determining a position of the object, the second sensor system includes a scale graduation that lies opposite the detector and is scanned by the detector in a scanning area in which the measuring structure and the scale graduation are arranged placed on top of each other, or integrated into each other, and wherein the detector generates an acceleration signal and a position signal from a common scanning area. The measuring structure and the scale graduation are formed on a common body.
摘要:
Besides the measurement of angular position, an angular measurement system having an integrated Ferraris sensor also permits the direct measurement of angular acceleration or angular velocity. A graduated disk and an eddy-current disk are configured concentrically in one plane. Relief elements may ensure that temperature variations do not cause the connection between the graduated disk and the eddy-current disk to be lost.
摘要:
A permanent magnet rotary accelerometer comprising: a cylindrical magnetic return path formed out of magnetic permeable material; an electrically conductive cup with an axis for rotation there around, the cup surrounding the magnetic return path; one or more sets of permanent magnets having opposite magnetic polarity, surrounding the cup, for a producing magnetic field through the cup into the magnetic return path, thereby inducing eddy currents inside the cup when rotating in the magnetic field; a stator core formed out of magnetic permeable material surrounding the cup and nonrotatable relative thereto, the stator core comprising at least two pick up members and a stator core return path therein, wherein the pick up members and the stator core return path are formed from at least one continuous piece of magnetic permeable material; and one or more pickup coils disposed on the pickup members of the stator core for sensing changes in a secondary magnetic filed generated by the eddy currents in the cup.
摘要:
A method of controlling the positioning and/or speed of axes on a machine tool as well as an apparatus for carrying out the method. The inventive method controls the positioning and/or speed of fast-rotating, high-accuracy orbital axes (i.e. rotational axes) of a gear-manufacturing machine, wherein a standard NC is used. The inventive method and apparatus are realized by the inclusion of a second control system which is provided in addition to the standard NC and is structured such that the known aliasing effects generated by underscanning and the limitation of the dynamics by the cycle times are avoided or considerably reduced. By application of the inventive method, higher accuracy can be attained while maintaining the full functional scope of the standard NC.
摘要:
This invention describes an accelerometer of the electromagnetic, self-generating, non-seismic type having a simplified design that permits construction at low cost.
摘要:
An accelerometer has a solid cylindrical ferromagnetic rotor rotationally coupled to a vehicle wheel and coated with a conductive nonferromagnetic metal sheath. Magnets create a radial primary flux through the rotor while pickup coils located on the stator outside this field sense any variation in flux of a secondary field produced by the eddy currents in the coating. The output of these differentiating (pickup) coil is a function of the angular acceleration of the rotor and is used to regulate braking force in the wheel.