Method and device for the cyclic digital transfer of a position value of a moving object having inertial mass

Patent metadata

Field	Value
Publication number	US-10030973-B2
Application number	US-201113992389-A
Country	US
Kind code	B2
Filing date	Nov 3, 2011
Priority date	Dec 10, 2010
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

A method and device for the cyclic digital transfer of a position value of a moving object having inertial mass, the value range of the transferred position value being limited in such a way that no whole revolution or, in the case of a linear motion, other complete period that is conditional upon mechanical conditions is mappable, and the actual position is generated by detecting, in an evaluation unit, instances of the value range being exceeded.

First claim

What is claimed is:

1. A method for cyclic digital transfer of a position value of a moving object, comprising:
limiting a value range of a transferred position value such that no whole revolution or, for a linear motion, other complete period that is conditional upon mechanical conditions is mappable, wherein the value range corresponds to a partial section of at least one of the whole revolution and the other complete period that includes the transferred position value;
generating an actual position by detecting, in an evaluation unit, instances of the value range being exceeded;
wherein a position that is not value range-limited or that is far less value range-limited than in continuous operation is transferred at a first point in time; and/or the value range being determined in that the path difference occurring in one sampling cycle at maximum velocity being smaller than half of the selected value range, the value range being selected to be as small as possible; and/or a difference from a previous position being transferred under the same value-range limitation; and
regulating, with a control device, a motor current to a desired setpoint based on the actual position, wherein the regulating of the motor current includes adjusting a motor voltage.

2. The method according to claim 1 , wherein the position value is an angular value of a rotating part, as an inertial mass, having a moment of inertia.

3. The method according to claim 1 , wherein the transfer is periodically repeated over time, and/or cyclically repeated, and/or at regular time intervals.

4. The method according to claim 1 , wherein the change in velocity between two position measurements taken in succession in a time interval is limited to a critical value, that is determined or at least co-determined by the inertial mass.

5. The method according to claim 1 , wherein the position value is an angular value or a linear position, and the velocity is an angular velocity or a velocity occurring in a linear direction.

6. A method for controlling a drive, comprising:
measuring a position value in a periodically repeated process;
transferring information corresponding to the measured position value to a control device by the method recited in claim 1 ;
characterizing the position value by at least two values, including a partial angular value and a fine angular value, and/or digital values, a first value being characterized by a whole number, and a position value range being assigned to each number, wherein the position value range corresponds to a partial section of a complete period that includes the position value;
assigning each position range characterized by a first value, mutually separate partial ranges of the position range; each partial range being characterized by a second value that can be characterized as a whole number;
transferring the second value before the first value;
wherein following transfer of a newly measured second value, a first value, which corresponds to a newly measured first value, is determined from the newly measured and the previously transferred second value; and the control device uses the thus determined position value in order to determine an updated value of a manipulated variable of the control device, and
regulating, with the control device, a motor current to a desired setpoint based on the determined position value, wherein the regulating of the motor current includes adjusting a motor voltage.

7. A device for implementing the method as recited in claim 1 , comprising:
a sensor adapted to capture a position value, the sensor being linked via a digital interface to an evaluation unit, the evaluation unit having a memory and a determination device adapted to determine the position value from a transferred, value range-limited position value;
wherein the evaluation unit being linked to the control device.

8. A method for cyclic digital transfer of a position value of a moving object, comprising:
limiting a value range of a transferred position value relative to a value range of possible position values, so that no whole revolution or, for a linear motion, other full period that is conditional upon mechanical conditions is mappable, wherein the value range corresponds to a partial section of at least one of the whole revolution and the other full period that includes the transferred position value;
determining an actual position in that an estimated value for the position is generated from a previous position and a previously determined velocity, and
correcting the actual position using a transferred, value range limited position value, wherein an exceedance of the value range is ascertained by comparing the value range-limited, estimated position value to the transferred, value range-limited position value and being used to correct the estimated value; and/or a position being transferred once at a beginning whose value range encompasses the range of possibly occurring positions; and/or a difference from the previous position is transferred under the same value-range limitation; and
regulating, with a control device, a motor current to a desired setpoint based on the actual position, wherein the regulating of the motor current includes adjusting a motor voltage.

9. A method for digital transfer of a position value of a moving object, comprising
characterizing the position value by at least two values, including a partial angular value and subangular value and/or fine angular value, and/or digital values, a first value being characterized by a whole number; and a position value range being assigned to each number, each position range characterized by a first value being assigned mutually separate partial ranges of the position range; each of these partial ranges being characterized by a second value that can be characterized as a whole number, wherein the position value range corresponds to a partial section of a complete period that includes the position value;
measuring a position value at a first point in time;
transferring corresponding first and second values;
wherein a further position value is measured, and corresponding, newly measured, second value is transferred; and a position value range characterized by the first value, also from the first value corresponding to the newly measured position value is determined from the newly measured, second value and a previously measured second value; and
regulating, with a control device, a motor current to a desired setpoint based on the further position value, wherein the regulating of the motor current includes adjusting a motor voltage.

10. The method according to claim 9 , wherein an estimated value is determined from the previously measured or determined position value and from the corresponding velocity, and the second value of the newly measured position value is compared to the second value of the estimated value, and the difference between the second value and the newly measured position value and the second value of the estimated value is determined, and the position range corresponding to the newly measured position value is determined therefrom.

11. The method according to claim 9 , wherein the difference between the newly measured second value and the previously measured second value is determined, in response to exceedance of half of a position range, it is inferred that the newly measured position value resides in an adjacent position range.

12. The method according to claim 9 , wherein the newly measured second value and the previously measured second value are compared; and that adjacent range is determined in which the newly measured position value resides, when the difference between the newly measur

Assignees

• Simon Olaf
• Sew Eurodrive Gmbh & Co

Inventors

• Simon Olaf

Classifications

• H04Q2209/826

  where the data is sent periodically · CPC title

• H04Q2209/84

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• H04Q9/00

  Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom · CPC title

• H03M1/26

  with weighted coding, i.e. the weight given to a digit depends on the position of the digit within the block or code word, e.g. there is a given radix and the weights are powers of this radix · CPC title

• G01B21/16 Primary

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