Control system for an electric motor

A drive system having:

• a linear electric motor comprising a stator having a plurality of stator coils and a rotor movable along the stator,
• an emergency shutdown apparatus designed to carry out a transfer of the linear electric motor to an emergency shutdown, and
• a control system, wherein the control system is designed to control current sources of an energization device of a drive comprising the linear electric motor such that a current signal driving the rotor is only applied to said stator coils in an energization region in a vicinity of the rotor and such that the energization region shifts concomitantly with the rotor moving along the stator,
• wherein the control system comprises a position detection device and a coil monitoring device,
• wherein the position detection device is designed to generate position data representing a position of the rotor along the stator,
• wherein the coil monitoring device is designed to generate coil data representing a status of one or a plurality of the stator coils,
• wherein the control system comprises a position determining module designed to determine a rotor position on the basis of the position data,
• wherein the control system comprises a safety device designed to carry out a coordination between the coil data and the position data,
• wherein the safety device comprises a position calculation module designed to determine an energization position of the rotor within the energization region on the basis of the coil data,
• wherein the safety device comprises a position comparison module designed to compare the rotor position with the energization position in the context of the coordination, and
• wherein the safety device is connected to the emergency shutdown apparatus of the drive and designed to cause the emergency shutdown apparatus to carry out the emergency shutdown of the linear electric motor if an error has been discovered during the comparison between the rotor position and the energization position.

A method for controlling a linear electric motor of a drive, the linear electric motor comprising a stator having a plurality of stator coils and a rotor movable along the stator, wherein the method comprises:

• controlling current sources of an energization device of the drive such that a current signal driving the rotor is only applied to said stator coils in an energization region in the vicinity of the rotor and such that the energization region shifts concomitantly with the rotor moving along the stator,
• generating position data representing the position of the rotor along the stator, generating coil data, representing the status of one or a plurality of the stator coils,
• determining an energization position of the rotor within the energization region on the basis of the coil data,
• carrying out a coordination between the coil data and the position data,
• comparing the position of the rotor with the energization position in the context of the coordination, and
• causing the electric motor to be transferred to an emergency shutdown if an error has been discovered during the comparison between the position of the rotor and the energization position.