Patent ID: 11916499
Assignee: BECKHOFF AUTOMATION GMBH
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 4:
5. 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, and
wherein the first magnetic field generator differs from the second magnetic field generator at least in terms of its magnetic vector field;, 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;, the method further comprising the following steps:
when one of the two carriages is in a saturation position in relation to one of the drive coils, in which the magnetic field of the corresponding magnetic field generator puts a coil core of one drive coil into saturation, outputting a first setpoint current control signal for energizing the one drive coil with a first setpoint AC current to the stator having at least two drive coils as first control signal,
wherein the first measurement signal comprises a first voltage measurement signal that represents a derived coil voltage of the drive coil energized with the first setpoint AC current after the first setpoint current control signal has been output.