US 11,916,499 B2
Method for identifying a carriage of a linear transport system
Tobias Schönke, Bielefeld (DE); Marco Grabowski, Bielefeld (DE); Jan Achterberg, Duisburg (DE); Manuel Bettenworth, Gütersloh (DE); and Uwe Prüssmeier, Lemgo (DE)
Assigned to Beckhoff Automation GmbH, Verl (DE)
Filed by Beckhoff Automation GmbH, Verl (DE)
Filed on Feb. 2, 2021, as Appl. No. 17/165,475.
Application 17/165,475 is a continuation of application No. PCT/EP2019/069518, filed on Jul. 19, 2019.
Claims priority of application No. 10 2018 118 814.5 (DE), filed on Aug. 2, 2018.
Prior Publication US 2021/0159834 A1, May 27, 2021
Int. Cl. H02P 25/064 (2016.01); H02K 11/215 (2016.01); B65G 54/02 (2006.01); H02K 41/03 (2006.01)
CPC H02P 25/064 (2016.02) [B65G 54/02 (2013.01); H02K 11/215 (2016.01); H02K 41/031 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for identifying a carriage of a linear transport system,
wherein the linear transport system has a first carriage, a second carriage, a controller and a linear motor for driving the first and the second carriage,
wherein the linear motor comprises a stator having at least two drive coils and comprises a first and a second rotor, wherein the first rotor is arranged on the first carriage and the second rotor is arranged on the second carriage,
wherein the first carriage has a first magnetic field generator that is configured to generate a first magnetic field, and the second carriage has a second magnetic field generator that is configured to generate a second magnetic field,
wherein the first magnetic field generator has a plurality of magnets and the second magnetic field generator has a plurality of magnets,
wherein the magnets of the first magnetic field generator and the magnets of the second magnetic field generator are oriented in each case alternately with the south pole and the north pole facing the motor modules, and
wherein the first magnetic field generator differs from the second magnetic field generator at least in terms of its magnetic vector field, in which the pole orientation of the magnets of the first magnetic field generator of the first carriage is exactly opposite the pole orientation of the magnets of the second magnetic field generator of the second carriage;
the method comprising the following steps:
applying a first control signal to the stator having at least two drive coils, this control signal triggering a first measurement that depends on the magnetic vector field of the magnetic field generators of the two carriages;
receiving at least one first measurement signal associated with one of the two carriages, which measurement signal is based on the first measurement;
identifying the carriage associated with the first measurement signal as the first carriage or as the second carriage based on the at least the first measurement signal, wherein at least one reference value is stored in the controller and is associated with one of the two carriages, wherein the identification of the carriage is based on a comparison between the first measurement signal and the at least one reference value; and
outputting a first or a second identification signal that represents an identification of the carriage associated with the first measurement signal as the first or the second carriage.