JPS6198170A - Stop positioning method of one-side excitation type linear induction motor - Google Patents

Abstract

PURPOSE:To simply and accurately position a stop without contact by providing a punched hole at the secondary conductor, disposing a magnetic unit thereat, and exciting in single phase the coils of two phase of three phases at stopping time. CONSTITUTION:A punched hole 21 is formed at the secondary conductor 2, and a magnetic unit 8 is mounted on one opposite side of the primary core 5 at the hole 21. When the conductor 2 is stopped, the excitation of the 3-phase coils 6 of the core 5 is positioned at a stop by deenergizing the coil of one phase of the 3-phase coils 6 from the 3-phase excitation generated from a moving magnetic field and energizing in single phase the other 2-phase coils. Thus, it can be accurately stopped at the position where a magnetic field passing the hole 21 of the conductor 2 becomes 0.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a single-sided excitation type linear induction motor, and more particularly to a method suitable for positioning a stop.

[Background of the invention]

When a linear induction motor is applied to an article conveyance system in an office, factory, etc., the schematic configurations shown in FIGS. 7 and 8 can be considered. That is, in FIG. 7, on both sides of the secondary conductor 20,
FIG. 2 is a schematic configuration diagram of a double-sided excitation type linear induction motor in which a primary iron core 5 around which a three-phase coil 6 is wound is arranged, the secondary conductor 2 is integral with a carrier 1, and wheels attached to the carrier 1 3, it travels on the rail 4. In addition, 7 is the primary iron core 5
This is a pedestal for installing. In Figure 8, on one side of the secondary conductor 2,
This is a schematic configuration diagram of a single-side excitation type IJ near induction motor in which a primary iron core 5 around which a three-phase coil 6 is wound is arranged. Although the magnetic flux return path member (magnetic material) is not provided in FIG. 8, if it is provided on the entire surface of the secondary conductor 2 on the opposite side of the primary core 5, the thrust will be increased, but the weight of the carrier 1 will be heavy. Become,
Acceleration (transport speed) remains unchanged.

Although the single-side excitation type linear induction motor shown in Fig. 8 has a smaller thrust than the double-side excitation type linear induction motor shown in Fig. 7, it is easier to maintain the gap between the secondary conductor 2 and the primary core 5 (the gap can be made smaller). It has the advantages of simple structure and low installation height of the linear induction motor, and it can be installed in a space-saving manner without having to make major changes to the current equipment or desks etc. for transporting goods in existing rooms. It is possible to do so.

However, as is well known, linear induction motors have acceleration/deceleration functions but do not have a stop positioning function, so single-side excitation type IJ linear induction motors, such as the second cause, are applied to goods conveyance systems in offices, factories, etc. If so, how is the carrier 1
The problem is whether to determine the stop position of the secondary conductor 2. In the conventional method of determining the stop position of the conveyor 1 by mechanical contact using frictional force between the movable part and the rail 4, noise was generated, the stop could not be stopped accurately,
Another disadvantage is that the stop positioning mechanism is also complicated.

In addition, as an example of non-contact positioning of the movable part (carrying body) of this type of IJ near induction motor, there is
These are Publication No. 7-3588 and Japanese Unexamined Patent Publication No. 57-6.561.

[Purpose of the invention]

An object of the present invention is to provide a method for easily and accurately determining the stop position of a secondary conductor (carrying body) of a single-sided excitation type linear induction motor without contact.

[Summary of the invention]

The present invention provides a one-sided excitation type IJ near induction motor with five
One or more holes are provided in the secondary conductor, and a magnetic material is provided in the hole on one side of the secondary conductor opposite the primary core, and the primary three-phase coil is excited at a predetermined position of the secondary conductor. The present invention is characterized in that from three-phase excitation in which a moving magnetic field is generated, energization of one phase of the three-phase coils is stopped and the other two-phase coils are single-phase excited to perform stop positioning.

Embodiment of the Invention] FIG. 1 is a front view of a schematic configuration of a single-side excitation type linear induction motor showing an embodiment of the present invention, and FIG. 2 is a top view thereof, in which l is a carrier; 2 is the secondary conductor of the linear induction motor attached to the carrier 1, 21 is the two holes provided in the center of the secondary conductor 2, 3 is the wheel attached to the carrier 1, and 4 is the carrier 1 5 is the primary core of the linear induction motor, 6 is the three-phase coil wound around the primary core 5, and 8 is the hole 21 on one side of the secondary conductor 2 on the opposite side of the primary core 5. It is a magnetic material provided in the part. As is well known, the transport body 1 (secondary conductor 2) travels by exciting the three-phase coil 6 to generate a moving magnetic field.

FIG. 3 is an inner width view (side view) of the single-sided excitation type linear induction motor according to the embodiment of the present invention shown in FIG. '63 is each three-phase coil 6
The U-phase coil, V-phase coil, W-phase coil, and 9 are switches for switching the excitation of the U-phase coil 61, V-phase coil 62, W-phase coil 63 of the three-phase coil 6 from three-phase excitation to single-phase excitation. be. That is, the switch 9 is closed and the U-phase coil 61, 'V-phase coil 62, and W-phase coil 63 are excited in three phases so that a moving magnetic field is generated during acceleration and deceleration, and a stationary magnetic field is generated during stop positioning. , switch 9
open, stop the excitation of the U-phase coil 61, and turn off the excitation of the V-phase coil 6.
2 and the W-phase coil 63 are single-phase excited.

In the case of this single-phase excitation, for example, current flows through the V-phase coil 62 and W-phase coil 63 in the directions shown by ■ (from the front to the back of the page) and ■ (from the back to the front of the page) in Figure 3. Then, a magnetic field H is generated from the teeth 51 of the primary iron core 5 in the direction shown by the broken line arrow in FIG.

FIG. 4 is a diagram showing the relationship between the extraction holes 21 of the secondary conductor, the magnetic body 8, and the teeth 51 of the primary core 5 in FIG. The magnetic body 8 has two extraction holes 21 and three teeth 51 of the secondary core 5.
It is large enough to include.

Figure 5 shows the magnetic field generated from the teeth 51 of the primary iron core 5 (broken lines in Figure 3) when the switch 9 is opened and the V-phase coil 62 and W-phase coil 63 are single-phase excited. This figure shows an outline of the magnitude of the magnetic field H) shown by the arrow. When the magnetic body 8 is provided, the magnetic field H generated from the teeth 51 of the primary core 5 where the magnetic body 8 is located is the same as when the magnetic body 8 is not present. It increases from the solid line to the broken line.

FIG. 6 is an explanation of the stop positioning operation of an embodiment of the present invention)
It is a diagram. The stop positioning operation of the present invention will be explained with reference to this figure.

When the magnetic field H as shown in FIG. 6(a) is generated from the teeth 51 of the primary core 5, the positional relationship between the holes 21 of the secondary conductor 2 and the teeth 51 of the primary core 5 is as shown in FIG. 6(b). If there is, the primary iron core 5
Since the magnetic field H generated by the fifth tooth 51 from the left of the primary core 5 passes through the hole 21 on the left side of the secondary conductor 2, as shown in FIG. An electric current 0 that cancels the magnetic field H of 51 flows through the hole 21 on the left side of the secondary conductor 2, and between this current Io and the magnetic field H, according to Fleming's left-hand rule, a current flows in the right direction. The force acts and the secondary conductor 2 moves to the right. Furthermore, if the positional relationship between the hole 21 of the secondary conductor 2 and the teeth 51 of the primary core 5 is as shown in FIG. 6(C), the magnetic field H generated by the seventh tooth 51 from the left of the primary core 5 will 2, it passes through the hole 21 on the right side of Figure 6 (C).
As shown in , a current Io that cancels the magnetic field H of the seventh tooth 51 from the left of the primary core 5 flows through the hole 21 on the right side of the secondary conductor 2, and this current Io and the magnetic field H In between, according to Fleming's left hand rule, a leftward force acts, and the secondary conductor 2 moves to the left. Therefore, the secondary conductor 2 stops at the position shown in FIG. 6(d) where the magnetic field passing through the hole 21 of the secondary conductor 2 becomes zero. Figure 6 (b), (C
), the larger the magnetic field passing through the hole 21 of the secondary conductor 2,
The force required to move and stop in FIG. 6(d) is strong, and the stopping accuracy is also improved. For this reason, the magnetic material 8 is provided in the area of the extraction hole 21 of the secondary conductor 2, and the magnetic field generated by the teeth 510 of the primary core 5 located in the area of the extraction hole 21 is In this way, according to this embodiment, the secondary conductor 2 of the single-sided excitation type linear induction motor can be easily and non-contactly placed in a predetermined position.
Moreover, there is an effect that the stop position can be determined with high precision.

〔Effect of the invention〕

According to the present invention, the secondary conductor (m-transparent body) is placed at a predetermined position K,
Stop positioning can be performed easily and accurately without contact. For this reason, stopping positioning by mechanical contact is not possible.
The mechanism is simple, there is less noise), and accuracy is improved.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a single-sided excitation type linear induction motor according to an embodiment of the present invention, Fig. 2 is a top view of the 'LCX diagram, and Fig. 3 is an internal view of the single-sided excitation type linear induction motor of Fig. 1. Figure 4 is a diagram of the relationship between the holes in the secondary conductor in Figure 3, the magnetic material, and the teeth of the primary core; Figure 5' is a schematic diagram of the magnitude of the magnetic field generated by the teeth of the primary core in Figure 3; FIG. 6 is an explanatory diagram of the stop positioning operation according to an embodiment of the present invention, FIG. 7 is a schematic diagram of a double-sided excitation type linear induction motor, and FIG. 8 is a schematic diagram of a single-sided excitation type linear induction motor. 2...Secondary conductor, 21 river hole, 5...Primary iron core, 8
...1m ” ((:I) (C)rd>

Claims (1)

[Claims] 1. A single-side excitation type linear induction motor comprising a secondary conductor and a primary core having a three-phase coil wound around one side of the secondary conductor, comprising: providing a hole in the secondary conductor; and a magnetic material is provided in the punched hole portion of one side of the secondary conductor on the opposite side of the primary core, and the current flow to one phase of the three-phase coil is stopped at a predetermined position of the secondary conductor. A method for determining the stop position of a single-side excitation type linear induction motor, characterized in that the stop position is determined by single-phase excitation of the other two-phase coil.