Identification of a secondary part during use in a linear-motor-based system

Patent metadata

Field	Value
Publication number	US-10516359-B2
Application number	US-201816129978-A
Country	US
Kind code	B2
Filing date	Sep 13, 2018
Priority date	Sep 15, 2017
Publication date	Dec 24, 2019
Grant date	Dec 24, 2019

Abstract

A method for identifying a secondary part during use in a linear-motor-based system, wherein a primary part includes primary-part coils in the linear-motor-based system, the secondary part has a magnetic active part and the primary-part coils can be actuated via a drive current such that an advancing force acting on the secondary part and movement of the secondary part along the primary part is achievable, where at least one secondary-part winding in a circuit is provided on the secondary part, selected primary-part coils are energized via a primary current at one or more test signal frequencies to induce a secondary current in the secondary-part winding to identify the rotor, a characteristic property of the secondary-part winding or the circuit is representative of the secondary part, and where the secondary current influences a current response of the primary-part coils and the characteristic property is measured using the current response.

First claim

What is claimed is:

1. A method for identifying a secondary part during use in a linear-motor-based system, a primary part having primary-part coils being provided in the linear-motor-based system, the secondary part having a magnetic active part for forming a secondary-part magnetic field and the primary-part coils being actuateable via a drive current such that an advancing force acting on the secondary part and a movement of the secondary part along the primary part is achievable, at least one secondary-part winding in a circuit being provided on the secondary part, the method comprising:
energizing selected primary-part coils via a primary current at at least one or test signal frequency to induce a secondary current in the secondary-part winding to identifying the rotor, a characteristic property of one of (i) the secondary-part winding and (ii) the circuit being representative of the secondary part;
influencing a current response of the primary-part coils via the secondary current; and
measuring the characteristic property utilizing the current response.

2. The method as claimed in claim 1 , wherein the characteristic property is formed by an inductance or a saturation behavior of the secondary-part winding.

3. The method as claimed in claim 1 , wherein the characteristic property is formed by a resonant frequency of a series resonant circuit having the secondary-part winding.

4. The method as claimed in claim 1 , wherein the characteristic property is formed by a sequence of a short in the circuit made possible aided by the secondary current or a load modulation made possible in the circuit.

5. The method as claimed in claim 1 , wherein the current response indicates the characteristic property using one of (i) an amplitude, (ii) a signal shape and (ii) or a time profile of the amplitude or the signal shape.

6. The method as claimed in claim 1 , wherein a test signal frequency is output constantly via a sinusoidal or square-wave test voltage.

7. The method as claimed in claim 1 , wherein different test signal frequencies are output to analyze the current response in a search method.

8. The method as claimed in 1 , wherein a winding axis of the secondary-part winding is provided at least partially in a d-axis prescribed by the magnetic active part.

9. The method as claimed in 8 , wherein the winding axis of the secondary-part winding is provided completely in the d-axis prescribed by the magnetic active part.

10. The method as claimed in claim 1 , wherein, for identification purposes, the selected primary-part coils are energized using a primary current, which leads to an alternating magnetic field with portions in the direction of a winding axis of the secondary-part winding.

11. The method as claimed in claim 10 , wherein the selected primary-part coils are energized using a primary current, which leads to the alternating magnetic field with portions completely in the direction of the winding axis of the secondary-part winding.

12. A linear-motor-based system, comprising:
at least one primary part having primary-part coils;
at least one secondary part, a respective secondary part having a respective magnetic active part for forming a respective secondary-part magnetic field, the primary-part coils being actuatable via a drive current such that a primary-part magnetic field forms, and such that a movement of the at least one secondary part along the at least one primary part becomes achievable;
a respective secondary-part winding in a circuit, a characteristic property of one of (i) the secondary-part winding and (ii) the circuit being representative of the respective secondary part;
a control unit for energizing selected primary-part coils via a primary current at at least one test signal frequency to induce a secondary current in the secondary-part winding, and to measure the characteristic property via a current response of the primary-part coils, said current response being influenced by the secondary current.

13. The linear-motor-based system as claimed in claim 12 , wherein the circuit is a series resonant circuit.

14. The linear-motor-based system as claimed in claim 13 , wherein the secondary-part winding is embedded within the magnetic active part.

15. The linear-motor-based system as claimed in claim 12 , wherein the circuit is integrated into an RFID transponder comprising stored identification information.

16. The linear-motor-based system as claimed in claim 15 , wherein the secondary-part winding is embedded within the magnetic active part.

17. The linear-motor-based system as claimed in claim 12 , wherein the secondary-part winding is embedded within the magnetic active part.

18. The linear-motor-based system as claimed in claim 12 , wherein the secondary-part winding is provided in a spatially offset manner with respect to the magnetic active part.

19. The linear-motor-based system as claimed in claim 18 , wherein the secondary-part winding is provided in a spatially, laterally offset manner with respect to the magnetic active part.

20. A non-transitory computer program product encoded with a computer program which, when executed on a program-controlled device, causes identification of a secondary-part during use in a linear-motor-based system, the computer program comprising:
program code for energizing selected primary part coils via a primary current at at least one or test signal frequency to induce a secondary current in the secondary-part winding to identify a rotor, a characteristic property of one of (i) the secondary-part winding and (ii) a circuit being representative of the secondary part;
program code for influencing a current response of the primary-part coils via the secondary current; and
program code for measuring the characteristic property using the current response.

21. The non-transitory computer program product, as claimed in claim 20 , wherein the program-controlled device comprises one of (i) a controller and (ii) a converter.

Assignees

• Siemens Ag

Inventors

• Hamm Carsten
• Spindler Carsten
• Wedel Bernd

Classifications

• H02P2203/03

  Determination of the rotor position, e.g. initial rotor position, during standstill or low speed operation · CPC title

• H02P25/06 Primary

  Linear motors · CPC title

• H02K41/02

  Linear motors; Sectional motors · CPC title

• H02K11/225 Primary

  Detecting coils · CPC title