Abstract:
The invention relates to a method for processing a main signal produced by a sensor for detecting the rotation of a rotating target having voltage levels. The main signal includes pulses having, for a rotation speed of the given target, a first positive voltage level when the target rotates in a first predetermined rotational direction or a second positive voltage level, different from said first voltage level, when the target rotates in a second rotational direction opposite said first rotational direction. A first secondary signal (COMP1) is generated in comparison with the main signal at a first predetermined voltage threshold (TH1), between the first voltage level and the second voltage level. A second secondary signal (COMP2) is generated in comparison with the main signal at a second predetermined voltage threshold (TH2), between the second voltage level and the zero voltage. A predetermined delay (τ) in the second signal is intentionally added in relation to the first secondary signal. Then the duration between an active front end of the second secondary signal and the last active front end of the first secondary signal preceding said active front end of the second secondary signal is compared with a predetermined time threshold so as to therefrom deduce the rotational direction of the target.
Abstract:
An encoder apparatus comprising a scale comprising a series of features defining at least one scale track and a readhead for reading the scale's features. The readhead comprises at least one light source for illuminating the scale and at least one detector. The configuration of the at least one light source is such that there is a structure in the light projected toward the scale. The readhead is configured such that the structure is angled so that it is substantially misaligned with respect to the scale's features so as to reduce measurement error in the signal output by the readhead.
Abstract:
A position detection sensor includes: a linear member; a conductive portion and an insulating portion provided in an outer periphery of the linear member and arranged side by side in a direction of an axis of the linear member; a support member having insulating properties and provided so as to be capable of being relatively advanced or retracted in the direction of the axis with respect to the conductive portion and the insulating portion; and a conductive contact member attached to the support member and configured such that a distal end of the contact member comes in contact with outer surfaces of the conductive portion and the insulating portion by a biasing force toward the outer surfaces of the conductive portion and the insulating portion.
Abstract:
A magnetic encoder has a high resolution track including a plurality of North/South pole pairs defining a plurality of pole junctions, and a reference track including a North/South pole pair defining a North/South pole junction aligned with a first pole junction of the high resolution track, and a South/North pole junction aligned with a second pole junction of the high resolution track. Only a single pole junction of the high resolution track is positioned between the first and second pole junctions of the high resolution track.
Abstract:
Die Erfindung betrifft einen Inkrementalwegsensor, bei dem an einem Maßkörper (1) eine Mehrzahl von Inkrementen (3, 4, 13, 14) angeordnet ist, wobei die Inkremente jeweils durch eine Abfolge wechselnder magnetischer Pole gebildet ist und wobei eine Auswerteschaltung (6) vorgesehen ist, die eine Weg- oder Winkelmessung durch Zählen einer Folge wechselnder magnetischer Pole ausführt, die durch einen Sensor (5) detektierbar sind. In der Abfolge der wechselnden magnetischen Pole ist wenigstens eine durch den Sensor ermittelbare Referenzposition (15) angeordnet.
Abstract:
An optical encoder may include an encoder disk (30), an illumination system, and a detector to detect light diffracted from the encoder disk. The encoder disk may include a signal track (32) comprising a diffraction grating, and an index track (34) comprising a reflective index mark (35), wherein a width of the index mark is larger than a pitch of the diffraction grating. An indexing method may include providing an encoder disk (30), providing an illumination system to direct light to the encoder disk, providing a detector structured to detect light diffracted from the encoder disk, calculating an estimated count of quadrature states from a rising edge of an index pulse to a middle of the index interval, and calculating the quadrature state at an approximate center of the index pulse. A dynamic parameter correction method may include calculating a target gain and offset and correcting values based on the target gain and offset.
Abstract:
The invention relates to an arrangement and to a method for generating a reference impulse (RI) for a position measuring device comprising a material measure (10) having at least one incremental track (20) and at least one reference mark (32), and to a scanning device (40) for generating position signals (PO, P90) by scanning the at least one incremental track (20) and for generating an analog reference impulse (RI_A) by scanning the at least one reference mark (32). The arrangement according to the invention comprises a reference impulse storage unit (200), in which the analog reference impulse (RI_A) can be stored as a stored reference impulse (RI_M). The stored reference impulse (RI_M) and the at least one position signal (PO, P90) are fed to a reference impulse generating unit (220) which switches on reference impulse (RI) according to the stored reference impulse (RI_M) and to the occurrence of a set condition and which switches off the reference impulse when a reset condition occurs, wherein the set and reset conditions can be derived from the at least one position signal (PO, P90). The invention further relates to a position measuring device having an arrangement according to the invention.