Decentralized linear motor regulation for transport systems
An example electromotive linear drive mechanism for moving walkways for conveying people or objects may comprise a long stator as an active primary part positioned along a direction of movement of a moving walkway, as well as a plurality of passive secondary parts that are movable with respect to the active primary part and are arranged with one another along the direction of movement. The long stator may have a plurality of successive long stator sections in the form of coil groups along the direction of movement. Each long stator section may have its own control device that is configured to move the secondary parts using control parameters stipulated for the respective long stator section. Further, example methods for operating the electromotive linear drive mechanism may involve predefining different movement profiles for the respective control devices for at least some of the long stator sections such that the secondary parts move along the long stator in a non-uniform manner.
1. An electromotive linear drive mechanism for moving walkways for conveying people or objects, the electromotive linear drive mechanism comprising:
a long stator positioned along a direction of movement of a moving walkway, wherein the long stator is an active primary part and comprises a plurality of successive long stator sections configured as coil groups, with the plurality of successive long stator sections being arranged along the direction of movement;
a plurality of passive secondary parts that are movable with respect to the active primary part and are configured behind one another along the direction of movement; and
a control device for each of the plurality of successive long stator sections, wherein each control device controls movement of the plurality of passive secondary parts according to control parameters of each respective long stator section, wherein the control devices of the plurality of successive long stator sections are connected to a central controller that uses a clock signal to synchronize the control devices, wherein the central controller changes an average speed of the plurality of passive secondary parts along the long stator by changing a frequency of the clock signal.
2. The electromotive linear drive mechanism of claim 1 wherein each control device comprises a memory, wherein each control device stores a predefined movement profile for the plurality of passive secondary parts in the memory.
3. The electromotive linear drive mechanism of claim 2 wherein at least two of the predefined movement profiles are different such that the plurality of passive secondary parts move along the long stator in a non-uniform manner.
4. The electromotive linear drive mechanism of claim 1 wherein aside from the clock signal from the central controller each control device autonomously controls the plurality of passive secondary parts that correspond to the respective long stator section.
5. The electromotive linear drive mechanism of claim 1 wherein a quantity of the plurality of successive long stator sections is greater than a quantity of the plurality of passive secondary parts.
6. The electromotive linear drive mechanism of claim 1 wherein the long stator forms a closed movement circuit for the plurality of passive secondary parts.
7. The electromotive linear drive mechanism of claim 1 wherein each of the plurality of successive long stator sections comprises a plurality of coils and a converter for controlling the plurality of coils.
8. The electromotive linear drive mechanism of claim 1 wherein the plurality of passive secondary parts comprises permanent magnets.
9. The electromotive linear drive mechanism of claim 1 further comprising at least one sensor for detecting a state of the plurality of passive secondary parts, wherein the at least one sensor is connected to the control devices.
10. A method of operating an electromotive linear drive mechanism comprising a long stator positioned along a direction of movement of a moving walkway, wherein the long stator is an active primary part and comprises a plurality of successive long stator sections configured as coil groups, a plurality of passive secondary parts that are movable with respect to the active primary part and are configured behind one another along the direction of movement, and a control device for each of the plurality of successive long stator sections, wherein each control device controls movement of the plurality of passive secondary parts according to control parameters of each respective long stator section, the method comprising:
predefining and assigning movement profiles to the control devices for at least some of the plurality of successive long stator sections, wherein at least two of the movement profiles are different such that the plurality of passive secondary parts move along the long stator in a non-uniform manner; and
changing an average speed of the plurality of passive secondary parts along the long stator by changing a frequency of a clock signal from a central controller.
11. The method of claim 10 further comprising moving the plurality of passive secondary parts along the long stator in a matching movement sequence.
12. The method of claim 10 further comprising changing a quantity of the plurality of passive secondary parts.