Method and device for determining the actual reversal of a follow-on rotary drive
AssigneeSiemens Aktiengesellschaft
InventorLeonard Preymann
Life of this patent
Estimating the term…
Abstract
A method and a device for incrementally determining the actual reversal of a rotary drive that rotates on slightly even after a preceding signal switching the rotational direction is applied. A sequence of pulse signals (N; S; SL) that are proportional to the rotational speed, with an intermittent reference signal (SL) that is different from said pulse signals, is output by an asymmetric transmitter wheel (1) and received by a single sensor (3) located on the stator. A pulse signal correction value for determining the pulse signal count value corresponding to the actual reversal (U) of the rotary drive is defined, based on the number of pulse signals that are measured between two reference signals following a switch of direction.
Claims14
Method for incremental determination of an actual reversal of a rotary drive that follows on after a preceding signaled switch in rotary direction, comprising:
- defining rotation of the rotary drive with a sequence of pulse signals that are proportional to rotational speed of the rotary drive, with an intermittent reference signal that differs from the pulse signals;
- counting the pulse signals on a stator side;
- determining the actual reversal of the rotary drive after the signaled switch in rotational direction by utilizing a pulse signal correction value, and by utilizing a change from a monotonous increase to a monotonous decrease of pulse signal lengths of the pulse signals;
- wherein the pulse signal correction value is derived from counting the pulse signals between respective occurrences of the reference signal before and after the actual reversal of the rotary drive.
Device for determining an actual reversal of a rotary drive that follows on after a preceding signaled switch in rotary direction, comprising:
- an asymmetrical rotor-side transmitter producing a sequence of pulse signals that are proportional to rotational speed of the rotary drive, and an intermittent reference signal that differs from the pulse signals;
- one single stator-side sensor receiving the signals from the rotor-side transmitter wheel and outputting a stator-side signal count value;
- and
- an evaluating device forming a pulse signal correction value derived from a count of the signals between respective occurrences of the reference signal before and after the actual reversal of the rotary drive and adjusting the stator-side signal count value, based on the pulse signal correction value, to reflect the actual reversal of the rotary drive.
Dependencies are inferred from the claim text.