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Control method and drive system of linear motor

By using multiple stators and movers in a distributed linear motor, combined with position sensors and control units, the problem of mover speed changes between multiple stators is solved, achieving smooth travel and precise position control of the mover.

Active Publication Date: 2012-07-04
THK CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the transport path becomes longer, there will be problems such as an increase in equipment cost, so a method of distributing the stators has been proposed.

Method used

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Embodiment Construction

[0024] Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

[0025] First, the schematic configuration and functions of a drive system in which linear motors are dispersedly arranged according to the present embodiment will be described with reference to the drawings.

[0026] Figure 1 to Figure 4 It is a schematic diagram showing the configuration of a drive system in which linear motors are dispersedly arranged according to the present embodiment. Figure 5 yes means figure 1 A block diagram of an example of the structure of a motor drive device.

[0027] Such as figure 1 As shown, the driving system of distributed linear motors includes: distributed linear motors 1 for conveying components or workpieces; multiple motor drive devices 40 (40A, 40B, 40C) for controlling distributed linear motors 1; and The host controller 50 which controls the motor drive device (driver) 40 (40A, 40B, 40C).

[0028] The dist...

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Abstract

The disclosed linear motor, wherein stationary elements are disposed in a dispersed manner, performs position control of a mobile element while driving the mobile element smoothly and preventing unnecessary speed fluctuations. A drive device calculates the deviation between a position command from a control device and a position detected by means of the position sensor of the corresponding stationary element, performs position control wherein a speed command that is used in speed control of the mobile element is calculated on the basis of said deviation and a position gain, and of the range wherein position is detected by means of the position sensor of the corresponding stationary element, when the mobile element enters a control range wherein at least one portion of the magnet of a magnet section faces the coil of said stationary element, the deviation is back calculated wherein the speed of motion of the mobile element is taken as the speed command, the position of the mobile element is back calculated from said deviation and a position command, and taking the calculated position as the position of the mobile element when the mobile element entered the control range, position control is performed correcting the position detected by the position sensor.

Description

technical field [0001] The present invention relates to a linear motor used for driving a carriage of a conveying device, etc., and particularly relates to a linear motor drive system and a linear motor control method in which the stators of the linear motor are distributed. Background technique [0002] Linear motors used for conveyance of parts, workpieces, etc. generally have a structure in which a mover moves on a single stator. However, if the conveyance path becomes longer, problems such as an increase in equipment cost will arise, and therefore a method of distributing the stators has been proposed. In such dispersed (discontinuously arranged) stators, for example, Patent Document 1 discloses a method for reducing speed variation of a linear motor in which the relationship between the position and acceleration of the secondary side carriage is grasped, The above-ground primary side distributed arrangement method driven by the ring will not cause speed instability. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P25/06H02K41/02H02K41/03
CPCH02P25/06
Owner THK CO LTD
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