Method of monitoring a machine

Patent metadata

Field	Value
Publication number	US-11435402-B2
Application number	US-202016903641-A
Country	US
Kind code	B2
Filing date	Jun 17, 2020
Priority date	Jun 17, 2019
Publication date	Sep 6, 2022
Grant date	Sep 6, 2022

Abstract

A method of monitoring a machine is described. The machine includes a mechanical system moved by a motor, where the mechanical system has more than two components coupled to each other. The two or more components move differently when the mechanical system is driven by the motor. The method includes repeatedly determining one movement factor of one of the components, and repeatedly determining one dynamic factor of one of the components. The movement factors of the remaining components are then calculated via a model of the mechanical system, and separate parameters for the components of the mechanical system are determined from the movement factor, the dynamic factor, and the calculated movement factors.

First claim

The invention claimed is:

1. A method of monitoring a machine in which a mechanical system is moved by a motor, wherein the mechanical system comprises more than two components coupled to one another, wherein one of the components comprises the motor, wherein at least two of the components move differently when the motor drives the mechanical system, and wherein
at least one movement factor of one of the components of the mechanical system is determined repeatedly;
at least one dynamic factor of one of the components of the mechanical system is determined repeatedly;
the movement factors of the remaining components of the mechanical system are calculated by means of a model of the mechanical system; and
separate mechanical parameters for the components of the mechanical system are determined from the determined movement factor, from the determined dynamic factor and from the calculated movement factors.

2. The method in accordance with claim 1 ,
wherein a plurality of values of the determined movement factor and/or of the determined dynamic factor are used to determine the mechanical parameters for the components of the mechanical system.

3. The method in accordance with claim 1 ,
wherein an equation system having a plurality of equations is set up and solved to determine the mechanical parameters.

4. The method in accordance with claim 3 ,
wherein the equation system is having one equation per value of the determined movement factor.

5. The method in accordance with claim 1 ,
wherein the movement factor comprises a speed; a position; an acceleration; an angular speed; an angular position; and/or an angular acceleration.

6. The method in accordance with claim 1 ,
wherein the model of the mechanical system comprises at least one transfer function (x 1 , x 2 ) which describes the movement of a first component in dependence on the movement of a second component which is coupled to the first component.

7. The method in accordance with claim 6 ,
wherein the movement factors are each multiplied by a derivative of the transfer function which describes the movement of the respective component.

8. The method in accordance with claim 1 ,
wherein the mechanical parameters comprise a torque; and/or a force;
and/or a parameter for calculating a torque or a force.

9. The method in accordance with claim 8 ,
wherein the parameter for calculating the torque or the force is based on an acceleration or a speed.

10. The method in accordance with claim 1 ,
wherein the method is carried out separately several times, in particular twice, to determine mechanical parameters for different directions of movement of a component.

11. The method in accordance with claim 10 ,
wherein the method is carried out separately twice, to determine mechanical parameters for different directions of movement of a component.

12. The method in accordance with claim 1 ,
wherein the determined movement factor and/or the determined dynamic factor is/are measured and/or calculated from a measured value.

13. The method in accordance with claim 12 ,
wherein the determined movement factor and/or the determined dynamic factor is/are measured and/or calculated from a motor torque.

14. The method in accordance with claim 1 ,
wherein a new determination of the mechanical parameters takes place when the determined movement factor and/or the determined dynamic factor changes/change, for example by more than 10% or by more than 15%.

15. The method in accordance with claim 1 ,
wherein the model of the mechanical system comprises a digital twin.

16. The method in accordance with claim 1 ,
wherein a value for at least one mechanical parameter is determined several times and a final value for the mechanical parameter is calculated from the plurality of values.

17. The method in accordance with claim 1 ,
wherein a change of the control of the motor takes place on the basis of at least one of the mechanical parameters.

18. The method in accordance with claim 1 ,
wherein a predictive maintenance of the machine is carried out on the basis of at least one mechanical parameter.

19. An industrial machine having a mechanical system which comprises a motor and at least two further components, wherein the components are coupled to one another, wherein at least the two components move differently when the motor drives the mechanical system, and wherein the machine comprises at least one sensor and a processing device and is designed
to repeatedly determine at least one movement factor of one of the components of the mechanical system;
to repeatedly determine at least one dynamic factor of one of the components of the mechanical system;
to calculate the movement factors of the remaining components of the mechanical system by means of a model of the mechanical system; and
to determine separate mechanical parameters for the components of the mechanical system from the determined movement factor, from the determined dynamic factor and from the calculated movement factors.

Assignees

• Schneider Electric Ind Sas

Inventors

• Rieger Michael
• Heid Juergen

Classifications

• G05B19/4063

  Monitoring general control system (G05B19/4062 takes precedence) · CPC title

• G05B17/02

  electric · CPC title

• H02P23/14

  Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage · CPC title

• G01M15/00

  Testing of engines · CPC title

• G01R31/343 Primary

  in operation · CPC title