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Linear motor system

A linear motor and winding technology, applied in control systems, AC motor control, electric vehicles, etc., can solve the problems of control performance degradation, speed fluctuation, induced voltage and inductance difference, etc.

Inactive Publication Date: 2007-09-12
YASKAWA DENKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, compared with the controller 904, there is a problem that the control of the section switching device 905 is very complicated.
[0009] Furthermore, for the conventional linear motor system 900, there is a difference in induced voltage and inductance between the state where the movable element 901 is placed between adjacent stators 903 and the state where the movable element 901 is placed completely facing the stator 903
Therefore, when the controller 904 supplies current to the stator 903, depending on the position of the movable element 901 with respect to the stator 903, the induced voltage and inductance will be different, so that the problems of control performance degradation and speed fluctuation will occur.

Method used

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Experimental program
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Effect test

Embodiment 1

[0181] FIG. 1 is a configuration diagram showing a linear motor system of a first embodiment of the present invention.

[0182]FIG. 2 is a diagram for explaining the structure of the winding switching device in FIG. 1 .

[0183] In FIG. 1, reference numeral 100 denotes a linear motor; 1, a movable element; 2, a permanent magnet; 3, a stator; 4, a winding group; 5, a winding; 6, a winding switching device; and 7, a controller.

[0184] The movable element 1 is formed by bonding permanent magnets 2 in the direction of stroke such that their adjacent polarity differs. The stator 3 is constituted by arranging a plurality of winding groups 4 each formed of a winding 5 having a U phase, a V phase, and a W phase, on a stroke. The movable element 1 and the stator 3 are coupled together through guide rails (not shown), and the movable element 1 is free to move relative to the stator 3 in the stroke direction. For the windings 5 ​​with U phase, V phase and W phase forming each winding...

Embodiment 2

[0196] Figure 3 shows a second embodiment of the invention.

[0197] In FIG. 3, reference numeral 8 denotes a sensor for detecting whether the movable member is in a relative position.

[0198] For each winding set 4 forming the stator 3 , a sensor 8 for detecting whether the moving element 1 is facing the winding set 4 is arranged on the face directly facing the moving element 1 . In order to open and close the semiconductor switch 62 , the output of the sensor 8 is connected to the signal terminal of the winding switching device 6 which is connected to the winding set 4 provided with the sensor 8 .

[0199] When the sensor 8 detects that it is against the movable element 1 , the sensor 8 transmits a closing signal to the connected semiconductor switch 62 . Once this signal is received, the semiconductor switch 62 is closed and the winding 5 connected to the winding group 4 of the winding switching device 6 arranged with the semiconductor switch 62 is energized by receiving ...

Embodiment 3

[0203] Fig. 4 shows a third embodiment of the present invention.

[0204] In FIG. 4, for the length Lml of the movable element 1 in the stroke direction, and the length Lc of the winding group 4 constituting the stator 3 in the stroke direction, the following length relationship is established:

[0205] Lml=n×Lc

[0206] n: an integer of 2 or greater

[0207] In this embodiment, n is 2, and the length Lc of the winding group 4 is defined as half the length Lml of the movable element 1 in the stroke direction.

[0208] On the face of each winding group 4 facing the moving element 1 , at each end in the direction of stroke, two sensors 81 and 82 for detecting whether the moving element 1 is facing the winding group 4 are arranged. The signal processing circuit 9 is provided between the sensors 81 and 82 and the winding switching device 6 receiving signals from the sensors 81 and 82, so that when the sensors 81 and 82 arranged at both ends in the direction of stroke detect that...

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Abstract

There is provided a linear motor system capable of realizing a long stroke of a linear motor while saving energy and reducing cost. The linear motor system includes a linear motor (100), a controller (7) for supplying variable voltage, and a winding switching device (6) for opening / closing a phase winding (5) of each of phases constituting a plurality of winding groups (4) divided into the stroke direction. The winding switching device (6) is formed by three-phase rectification means, a semiconductor switch arranged at both sides of its DC output side, a resistor and a capacitor each connected in parallel. Each of the phase windings constituting the plurality of the winding group (4) has one end connected to the output end of the controller (7) and the other end connected to the AC input side of the three-phase rectification means of the winding switching device (6). By opening / closing the semiconductor switch of the winding switching device (6), it is possible to excite a desired winding group (4) among the plurality of winding groups (4) divided in the stroke direction.

Description

technical field [0001] The present invention relates to a linear motor system capable of extending the stroke of a linear motor at energy saving and low cost, and more particularly to a long-stroke linear motor system including a winding switching device. [0002] Furthermore, the invention also relates to a linear motor of the fixed armature type, wherein the stator side is formed by the linear motor stator and the armature winding, and the movable element side is formed by a set of permanent magnets and a secondary conductor. Background technique [0003] A conventional linear motor system includes: a permanent magnet as a movable element, which serves as a magnetic load device; and a winding as a stator, which serves as an electrical load device. A plurality of windings are arranged in the stroke direction, to which a controller is respectively supplied for supplying current, and is connected to an interval switching device (for example, see Patent Document 1). [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P25/06B60L13/03
CPCY02T10/7241
Inventor 山田健二前村明彦森本进也鹿山透田中善之高木护
Owner YASKAWA DENKI KK