Linear conveyor system and control method for linear conveyor system

Abstract

In this linear conveyor device (100), when both a first movable element (321) and a second movable element (322) are located above a first control coil (112a) to which a first control driver (151) is connected, the first control driver performs propulsion force reduction control for controlling the current of the first control coil such that the first control coil reduces the propulsion force applied to the first movable element and the second movable element.

Claims

1. A first slider having a first movable element, A second slider having a second movable element, A stator having a plurality of coils arranged along a predetermined direction, The system comprises a plurality of control drivers, each connected to a control coil among the plurality of coils, which control the current of the control coil to which they are connected, thereby providing the first movable element and the second movable element with a thrust force along the predetermined direction, A linear conveyor device in which, among the plurality of control drivers, the first control driver performs thrust reduction control by controlling the current of the first control coil so as to reduce the thrust force that the first control coil imparts to the first and second movers when both the first and second movers are located above the first control coil to which the first control coil is connected.

2. The linear conveyor device according to claim 1, wherein the first control driver performs the thrust reduction control so as not to supply current to the first control coil when both the first movable element and the second movable element are positioned above the first control coil.

3. The linear conveyor device according to claim 1, wherein a second control driver connected to a second control coil adjacent to the first control coil controls the current of the second control coil to compensate for the reduction in thrust of either the first or second movable element, whichever is located above the second control coil, when the first control driver performs the thrust reduction control.

4. The linear conveyor device according to claim 3, wherein the second control driver increases the current of the second control coil in order to maintain the thrust force by compensating for the reduction in thrust force caused by the thrust force reduction control of the control movable element when the first control driver performs the thrust force reduction control.

5. The linear conveyor device according to claim 3, wherein the second control driver controls the current of the second control coil to increase based on the amount of overlap between the control movable element and the first control coil, in order to compensate for the reduction in thrust caused by the thrust reduction control of the control movable element.

6. The linear conveyor device according to claim 5, wherein the second control driver obtains a multiplier for the current command of the second control coil based on the overlap amount, and controls the current of the second control coil to increase based on the obtained multiplier for the current command of the second control coil in order to compensate for the reduction in thrust caused by the thrust reduction control of the control movable.

7. The system further comprises a position detection unit for detecting the positions of the first movable element and the second movable element, The linear conveyor device according to claim 1, wherein the first control driver performs the thrust reduction control when the position detection unit detects that both the first movable element and the second movable element are positioned above the first control coil.

8. The control coil consists of one or more three-phase coils. The linear conveyor device according to claim 1, wherein the first control driver performs the thrust reduction control when both the first movable element and the second movable element are located above the first control coil, which consists of one or more three-phase coils.

9. The control coil consists of one of the three-phase coils. The linear conveyor device according to claim 1, wherein the first control driver performs the thrust reduction control when both the first movable element and the second movable element are positioned above the first control coil, which is one of the three-phase coils.

10. A control method for a linear conveyor device comprising a first slider having a first movable element, a second slider having a second movable element, and a stator having a plurality of coils arranged along a predetermined direction, The steps include controlling the current of the plurality of coils to provide the first movable element and the second movable element with a thrust force along the predetermined direction, A control method for a linear conveyor, comprising the step of performing thrust force reduction control by controlling the current of a predetermined control coil so as to reduce the thrust force that the predetermined control coil imparts to the first and second movable elements when both the first and second movable elements are located above a predetermined control coil among the plurality of coils.

Images