Linear motor system

• US 9,812,939 B2
• Filed: 06/02/2016
• Issued: 11/07/2017
• Est. Priority Date: 08/21/2015
• Status: Active Grant

• Current Assignee: Murata Machinery Limited (Muratec)
• Original Assignee: Murata Machinery Limited (Muratec)
• Inventors: Kumazawa, Tsuyoshi, Nagasawa, Atsuo
• Primary Examiner(s): Masih, Karen
• Application Number:
  US15/171,874
• Publication Number:
  US 20170054400A1
• Time in Patent Office: 523 Days
• CPC Class Codes: H02K 41/03 Synchronous motors; Motors moving step by step; Reluctance motors H02K41/035 takes precedence
• CPC Class Codes: H02P 25/06 Linear motors

Abstract

A linear motor system includes a plurality of armatures that are disposed along a movement path of a mover continuously or discretely, a detector that detects position information of the mover in the movement path, zone controllers that are provided to a plurality of unit zones of the movement path in one-to-one correspondence and control the armatures disposed on the unit zones, respectively, and an integrated controller that supplies a traveling instruction of the mover to the plurality of zone controllers provided to the movement path based on the position information detected by the detector and totally controls the plurality of zone controllers. The zone controllers determine whether the mover to be driven is present in the related unit zones based on the traveling instruction, and control the plurality of armatures based on determined results.

Claims

1. A linear motor system comprising:

a plurality of armatures that are disposed along a movement path of a mover continuously or discretely;

a detector that detects position information of the mover in the movement path;

zone controllers that are provided to a plurality of unit zones of the movement path in one-to-one correspondence and control the armatures disposed on the unit zones, respectively; and

an integrated controller that collectively supplies an identical traveling instruction relating to the movers to the plurality of zone controllers provided to the movement path based on the position information detected by the detector and controls the plurality of zone controllers, wherein

the zone controllers determine whether the mover to be driven is present in the related unit zones based on the traveling instruction, and control the plurality of armatures based on determined results.

2. The linear motor system according to claim 1, wherein when the mover is present in the related unit zones, the zone controllers control electric powers to be supplied to the plurality of armatures according to the traveling instruction.

3. The linear motor system according to claim 2, wherein when the mover is not present in the related unit zones, the zone controllers determine whether the mover related to the next traveling instruction is moving toward the related unit zones.

4. The linear motor system according to claim 3, wherein the zone controllers determine whether the mover related to the next traveling instruction is moving toward the related unit zones based on the previous traveling instruction.

5. The linear motor system according to claim 3, wherein when the determination is made that the mover related to the next traveling instruction is moving toward the related unit zones, the zone controllers store electric powers to be supplied to the plurality of armatures in advance.

6. The linear motor system according to claim 3, wherein when determining that the mover related to the next traveling instruction is not moving toward the related unit zones, the zone controllers ignore the traveling instruction.

7. The linear motor system according to claim 1, wherein

the plurality of zone controllers obtain the position information detected by the detector, and supplies at least a part of the obtained position information to the integrated controller,

the integrated controller supplies the position information obtained from the plurality of zone controllers to the plurality of zone controllers.

8. The linear motor system according to claim 7, wherein the integrated controller supplies the position information obtained from the plurality of zone controllers as well as the next traveling instruction to the plurality of zone controllers.

9. The linear motor system according to claim 1, wherein the integrated controller includes

area controllers that are provided correspondingly to the zone controllers in the two or more unit zones sequentially disposed on movement path, and

a system controller that supplies a common instruction including the traveling instruction to the zone controllers related to the area controllers via the area controllers.

10. The linear motor system according to claim 9, wherein

the zone controllers related to the area controllers obtain the position information detected by the detector, and supply at least a part of the obtained position information to the system controller via the area controllers,

the system controller supplies the position information obtained from the zone controllers related to the area controllers to the zone controllers related to the area controllers via the area controllers.

11. The linear motor system according to claim 9, wherein the zone controllers related to the area controllers are connected to each other by a daisy chain mode.

12. The linear motor system according to claim 1, wherein

the integrated controller generates a current instruction representing a value of the electric current to be supplied to the armatures as the traveling instruction,

the zone controllers control whether the electric current whose value is determined by the current instruction is supplied to the armatures based on results of determining whether the mover to be driven is present in the related unit zones.

13. The linear motor system according to claim 12, wherein the integrated controller supplies the current instruction to the plurality of zone controllers on a first cycle based on the position information detected by the detector,

the zone controllers determine whether the electric current is supplied to the armatures based on the position information detected by the detector on a second cycle that is shorter than the first cycle.

14. The linear motor system according to claim 13, wherein the integrated controller includes

a position controller that generates a speed instruction representing a target speed of the mover on the first cycle based on the position instruction representing the target position of the mover and the position information supplied from the detector, and

a speed controller that generates the current instruction on the first cycle based on the speed information of the mover generated from the speed instruction and the position information supplied from the detector.

15. The linear motor system according to claim 13, wherein each of the zone controllers includes

a current controller that sets a value of the electric current to be supplied to the armatures to a value determined by the current instruction, and

a switching element that switches a state of the path of the electric current to be supplied to the armatures between a conductive state and a cutoff state,

wherein the switching element controls the switching between the conductive state and the cutoff state on the second cycle based on the position information supplied from the detector.