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AssigneeHubner Electromaschinen GmbH
InventorBernhard Hiller
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The invention relates to a position measuring device and a position measuring system (1) that are used to process signals (SIN, COS), which represent the displacement (8) of a scale gradation (4) relative to a signal generation unit (7). To increase the resolution of the signals (SIN, COS), output signals (SIN′, COS′), which have a higher frequency or multiplied number of signal period in relation to the input signals (SIN, COS), are generated by the device (1). This enables evaluation units (3) that are connected downstream to record the position and speed of the scale gradation (4) more accurately. The number of signal periods is increased by the calculation of a position signal (POS) with a subsequent filtration or error correction from the input signals (SIN, COS) and by the reading of stored tables of output tables of output signals (SIN′, COS′) in accordance with the calculated position signals (POS).
A position measurement method, in which a digital position signal (POS, POS′, POS″) which represents a position measured by a position sensor is calculated from an input sine signal (SIN) and an input cosine signal (COS) produced by the position sensor, and with an output sine signal (SIN′) and an output cosine singal (COS′) each having a signal period (fp″) which is a multiple of the signal period (fp′) of the input signals (SIN, COS) being produced as a function of the digital position signal (POS, POS′, POS″).
A position measurement system (1) for processing of signals (SIN, COS, REF) from a position sensor (1) with an input interface (21) to which an input sine signal (SIN) and an input cosine signal (COS) from a position sensor (7) can be supplied during operation, having a calculation unit (30) by means of which a digital position signal (POS, POS′, POS″) which represents a position measured by the position sensor, can be produced from the input sine signal (SIN) and the output cosine signal (COS), and having a signal generation unit (16), by means of which an output sine signal (SIN′) and an output cosine signal (COS′) can be produced as a function of the position signal (POS), respectively with a signal period which is a multiple of the input sine signal (SIN) and the input cosine signal (COS).
Dependencies are inferred from the claim text.