JPS62126805A - Speed detector in conveyor - Google Patents

Abstract

PURPOSE:To effectively utilize a space by providing a primary side coil to be excited by an AC power source in a vacant space of a coil containing groove disposed at the end side of a moving magnetic field generator. CONSTITUTION:A secondary side conductor 12 is mounted on the lower surface of a pallet 11. Stators 13 are provided at a predetermined interval along a passage. Only one layer of coil 16 is contained in each of the grooves 15a disposed at both ends of the stators 13 to form a vacant space. Two coils 17, 18 are set in the vacant spaces. The outer coil 17 of the coils is excited by an AC power source, and the inner coil 18 outputs a speed signal of the conductor 12.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a speed detection device in a conveyance device using a linear induction motor (11).

[Prior Art J Conventionally, single-sided linear induction motors (hereinafter referred to as LI
(abbreviated as M) is used as Fll.

As shown in Figure 3 (a) and (b), this type of conveyance device consists of a rail 1 arranged along a conveyance path, and LIMs arranged at multiple locations on the conveyance path and responsible for generating a traveling magnetic field. stator 2
and a pallet 5, which is movably supported along the rail 1 by wheels 3, 3, and has a secondary conductor, which becomes the mover of the LIM, on the lower surface. By controlling the excitation of the side stator 2 as appropriate, 11 [forces are applied to the pallet 5 in sequence to cause the pallet 5 to move by 1 up to a predetermined order, and thereby the transported object M placed on the pallet 5 This is a transport system.

By the way, when it is necessary to detect the conveyance speed in this type of conveyance device, the following method has conventionally been adopted.

In other words, a tabzi roller 6 is installed on the conveyance path, and the rotation of the roller 6 is detected via a speed generator or a pulse generator attached to the roller shaft, or a temporary method in which a plurality of slits are formed in the pallet 5 is used. Install 7,
In this optical detection method, a light projector 8a and a light receiver 8b are each fixed to a conveyance path so that the temporary 7 is fixed between them, and a pulse frequency signal is generated from a light transmitter 8a.

[Problems to be Solved by the Invention] By the way, the following problems have been encountered in multiple conveyance speed detection means.

Since components for speed detection are arranged with a special space on the conveyor path or pallet 5, the installation space for the device is large.

In addition, since there is a risk of slippage between the rollers 6 and the pallet 5, there is a drawback that accurate speed detection cannot be performed especially when conveyance is delayed at high speed. If so, the emitter 8a or the receiver 8b
are sensitive to dirt, and if dirt adheres to those lenses,
The drawback was that it could not be detected.

"Means for solving the problem" By the way, the stator 2 of the linear induction motor houses a traveling magnetic field generating coil 9 as shown in FIG.
11110 is numbered 11) in the transport direction, and these multiple coils are stored! Stator 2 of i410
In the groove 111110g on the end side, the coil 9 is not completely buried like the other grooves, but an open space G is formed there. Conventionally, this open space G was simply filled with frames (4) as a funeral.

The present invention attempts to solve the above-mentioned problems by adding 411 to this bright space and using the same space effectively. A primary coil excited by a power source is set, and a secondary coil for detecting a change qt in magnetic flux generated by the primary coil and guided via the secondary conductor is set. It is at the point where it was set.

"Embodiment" An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a longitudinal sectional side view of a conveyance device equipped with a speed detection device according to the present invention. In the figure, reference numeral 11 is a pallet, and a secondary conductor 12 is attached to the lower surface of this pallet 11. Further, reference numeral 13 indicates stators provided at predetermined intervals along the path for transporting the pallet 11, and is responsible for generating the traveling magnetic field of the LIM.

The primary core 14 of the stator 13 has a coil storage ii+'
f l 5 is 't(
> +U defeat shadow is forming. And these ii41
5 has a pair of 3 hooks for generating a traveling magnetic field, 1 coil 1G.
... is wound every second, and one 1ii
They are shifted by t, and two locations are stored for one if+t l 5 (see FIG. 2). That is, here, the coil 16 is wound with 3 full-section 2P turns.

Here, to provide a supplementary explanation of how to wind these coils I6, from the left in FIG. 1, 1.2, . . .
, N, the coil 1G is wound as follows.

With this winding method, as shown in FIGS. 1 and 2, the coil storages located at both ends of the stator 13: Mt
Only one layer of coils 16 is housed in I 5 a (3 Ill from each end), and an open space is formed.

There are two coils in this bright space! 7.18 are set respectively. Inner and outer coils 1 of these coils
Reference numeral 7 denotes a primary coil excited by AC current, and when the secondary conductor 12 is placed above it at a position V, an eddy current is generated in the secondary conductor 12. Further, when the speed of the secondary conductor 12 changes and the eddy current generated in the secondary conductor 12 changes accordingly, the inner coil 18 detects the magnetic flux displacement at that time as a voltage change. A total of 19 III filters are connected to this secondary filter.

Note that 20 indicates a plurality of pallet supporting wheels arranged along the conveyance path.

Next, the operation of the speed detection device having the above configuration will be explained. First, the negative side coil 17 is excited by AC 7 [tilt]. When the secondary conductor 12 is located above the secondary conductor 12, an eddy current is generated in the secondary conductor 12, but the force of this eddy current changes depending on the speed of the secondary conductor 12. do. This change in the electromotive force of the secondary conductor I2 is 2
A change in the magnetic flux 1i1 that grips the secondary conductor 12 in the downward direction is promoted, and the displacement of this magnetic flux 1i appears in the secondary coil 18 as a magnitude of electromotive force. The four Zuna are also secondary conductors! 2 speed 1y change is on the secondary side if the pond conditions are the same)
・This will appear as a voltage change on the r 18. Therefore, what happens to this secondary coil 18? The speed of the secondary conductor 12Jj and the bullet 11 integrated therewith can be known just by detecting 4°.

In this type of speed detection device, a coil is installed in the open space at 6 and 6. There is no problem that the entire transport device including the transport device becomes larger.

In addition, compared to using a tudge roller as shown in the conventional example, it can be used at high speeds because there is no error caused by slippage between the roll and the secondary conductor. It should be possible to respond to the detection in 1 minute.

Furthermore, compared to the use of optical means as shown in the conventional example of serious crime, operation can be sufficiently avoided even when there is some dust. You can use it even in environments like Yuko.

In this embodiment, the traveling magnetic field generating coil 16 has three
Although an example in which the coil is wound in two layers throughout the entire section has been described, the present invention is of course applicable to cases where the coil is wound in other ways.

"Effects of the Invention" As explained above, according to the present invention, the coil housing i located on the end side of the traveling magnetic field generator among the coil housings 1111 for generating a magnetic field provided in the traveling magnetic field generator. /
In the open space of +7, there is a primary coil excited by an AC power source, and the magnetic flux generated by the excitation of the primary coil is 1゛1 (when the secondary conductor is displaced) , and a secondary coil for detecting the magnetic flux displacement n1, so it can be installed in the conveying device without requiring special installation space, and it can be installed at high speeds. It is possible to detect the speed with high accuracy, and furthermore, it is possible to obtain effects such as not having the problem of not being able to detect it due to the number of knots that occur when using optical means. .

[Brief explanation of drawings]

1 and 2 show one embodiment of the present invention. Figure 1 is a vertical cross-sectional view, Figure 2 is the stator in Figure 1.
3 (a) and (b) show an example of a conveying device equipped with a conventional speed detection device, (a) is a side view, and (b) is a side view.
1 is a bottom view, and FIG. 1 is a diagram illustrating a general I7 field generator. 11... Pallet, 12... Secondary conductor, 13... Stator (traveling magnetic field generator), 15,
I 5 a--ml storage! 1''? , I6...
... Coil for generating a traveling magnetic field, 17... Primary coil, 18... Secondary coil, 19... Voltmeter.

Claims (1)

[Scope of Claims] A conveyance device that conveys a pallet on which a secondary conductor is assembled by exciting traveling magnetic field generation devices arranged at appropriate intervals along a conveyance path, comprising the steps of: Among the traveling magnetic field generating coil housing grooves, a primary coil excited by an AC power source is placed in the open space of the coil housing groove located on the end side of the traveling magnetic field generating device. occurs,
A speed detection device for a conveying device, characterized in that a secondary coil for detecting the amount of change in magnetic flux guided through the secondary conductor is provided.