JPS5854862A - Linear induction motor - Google Patents

Abstract

PURPOSE:To make it possible to select stop positioning with a simple mechanism by dividing into two parts the iron core and the coil on the primary side. CONSTITUTION:A pair of advancing magnetic field generating coils and the primary ionr cores are divided into two parts to have the coils 3a and 3b and primary side iron cores 1a and 1b. A non-magnetic material 10 such as electricity insulating resin is filled between the primary side iron cores 1a and 1b. Further, the coils 3a and 3b are arranged so that forward and reverse currents are passed through them mutually independently. By exciting the coils 3a and 3b in opposite directions by passing current through them, powerful stop positioning can be made for the secondary side conductor plate 5.

Description

[Detailed description of the invention] The present invention relates to a linear induction motor (hereinafter referred to as "linear induction motor").

(abbreviated as ``2'' and ``M''), particularly regarding the improvement of the stop positioning method for L, ``■,'' and M.

In recent years, L, M, and M aircraft have been widely used as land transportation aircraft due to their simple structure, robustness, and high speed. In addition, small-sized devices are being used for conveyance systems of various automatic control devices. Furthermore, recently, attempts have been made to use it for transporting mail and documents in general offices and paper waste in financial institutions.

L', -I't·M according to the conventional method will be explained below with reference to FIGS. 1 and 2. FIG. 1 is a perspective view illustrating a vehicle to which the present invention is applied. FIG. 2 is a plan view of FIG. 1 with the vehicle body removed.

In the figure, 1 is the primary iron core, 2 is the comb tooth section, 3 is the traveling magnetic field generating coil, 4 is the rail, 5 is the secondary conductor plate, 7 is the vehicle body,
7' indicates the vehicle body, and 8 indicates the wheels.

As shown in FIGS. 1 and 2, two primary cores 1 are arranged to face each other in an orbital manner, and the comb teeth 2 formed on the opposing surfaces of each core are subjected to a traveling magnetic field generated by three-phase alternating current over the entire length. A generating coil 3 is wound. However, the next-side iron cores 1 are lined up with a slight gap (for example, 3 to 5+ m) every predetermined length (for example, 500 mm), and the traveling magnetic field generating coils 3 are also arranged at every predetermined length of the second-side iron core 1. One set is installed, and each can be powered individually. A rail 4 is installed on the upper surface of the two primary iron cores 1. On the other hand, the secondary conductor plate 5 is suspended from the lower surface of the vehicle body 7' having wheels 8 so as to be located in the center of the gap between the opposing primary cores 1.
It consists of As shown in FIG. 1, the vehicle body portion 7 is positioned so as to be freely movable on the rails 4 via wheels 8.

Since it has such a configuration, Tonori, I2. To run M, a traveling magnetic field is generated by energizing three-phase alternating current to the traveling magnetic field generating coil 3 of the primary iron core 1 at the position where the secondary conductor plate 5 is stopped. Eddy currents are induced, and thrust is generated by the interaction between the eddy currents and the traveling magnetic field, and the vehicle body 7 travels on the rails 4 by the wheels 8. When the secondary side conductor plate 5 enters the area of the adjacent traveling magnetic field generating coil 3, the traveling magnetic field generating coil 3 at that position is energized and propelled further in the traveling direction by the thrust caused by the traveling magnetic field and eddy current. At this time, the energization of the coil 3 at the position passed is cut off.

In this way, by energizing the traveling magnetic field generating coils 3 one after another, the vehicle can be made to travel. Next, in order to stop ・L, , M, which is traveling, turn off the current to the traveling magnetic field generating coil 3 in the traveling direction when it approaches the stop position, and reverse excite it by energizing it in the opposite direction. This can be applied to generate a thrust in the direction opposite to the traveling direction of the secondary conductor plate 5 to brake the secondary conductor plate 5, and also to stop the secondary conductor plate 5 using a friction brake (not shown). - The same applies when the next side iron core 1 is only on one side.

However, this method has the following drawbacks due to frictional force caused by mechanical contact between the wheels 8 and the rails 4.

That is, 1. A complicated braking mechanism with friction plates is required.

2. The stopping position of the movable part changes due to wear of the friction plate.

3. Frictional heat adversely affects the mechanical parts, resulting in a short lifespan.

4. Friction causes foul odors, smoke, and noise.

Problems such as 3- and the like occur, and it is particularly inconvenient to apply this method to office equipment. Also, instead of using friction brakes, a method of stopping the vehicle by hitting it against a shock absorber is sometimes used, but this method has the drawbacks of large noise and vibration, shortened lifespan of the vehicle body, and the fact that the stopping position changes due to reaction. There are drawbacks.

For this purpose, as a method for electrically determining the position, a method has been proposed in which a pair of single-phase AC coils is provided in the secondary iron core 1 and the position is determined by supplying current to the coils. This method alleviates the drawbacks of methods using friction brakes, etc., but has the drawback that control becomes complicated because a single-phase AC coil is provided separately from the traveling magnetic field generating coil.

The purpose of the present invention is to solve the above-mentioned drawbacks, and without making any major changes to the conventional structure of Ll, I, and M.
Stop positioning can be done with a simple mechanism, and
It is to provide I,・M.

In the present invention, a primary side iron core for carrying a traveling magnetic field generating coil is disposed on at least one side of a secondary side conductor plate made of a good conductor plate guided and supported by a conveyor rail, and the traveling magnetic field generating coil is In a linear induction motor that transports the secondary side conductor plate along the conveyance rail by exciting a The linear induction motor is characterized in that the secondary side iron core is divided into two at a position, and the secondary side conductor plate is stopped and positioned by exciting the two divided coils in opposite directions. In this way, the objective can be achieved.

Hereinafter, one embodiment of the present invention will be described with reference to the third area and the seventh syringe diagram. 3 is a side view showing an embodiment of the present invention, FIG. 4 is a sectional view taken along the line AN in FIG. 3, and FIG. 5 is a connection diagram of FIG. 3. 1a in the figure.

1b is the primary iron core, 2a and 2b are comb teeth, 3a13b is a three-phase AC coil, 10 is a non-magnetic material, 5W1a to 5w4a
, Swlb-8w4b indicates a switch. Also, the same parts as in FIGS. 1 and 2 are indicated by the same symbols.

As shown in FIGS. 3 and 4, a set of traveling magnetic field generating coil 3 and a primary (till iron core 1) are divided into two to form coils 3a, 3b and a secondary side iron core 1a.

1b, and a non-magnetic material 10 (for example, an insulating resin material) is filled between the secondary iron core 1a and lbO.The coil specifications of the coils 3a and 3b are 1-2 as shown in Fig. 5. Switch 5w1a~5w4a, Sw
Can be controlled independently by switching between lb and 5w4b,
It is designed to allow current to be passed in both forward and reverse directions.

With such a configuration, the secondary conductor plate 5 is made to travel in the same way as in the conventional method, and to stop it, the coils 3a and 3b are passed in opposite directions to each other (T(f)).

Powerful stop positioning can be achieved by exciting the magnet. To explain this stop positioning method in more detail, in FIG. 5, switches 5w1a and 5w1b
, 5w2a and S&2 bXS w 3 a and 5w3b,
5w4a and 5w4b are 8 and switch 5 that are interlocked with each other.
w1a and 5w2a, 5w1b and 5w2b.

5w3a and 5w4a, and 5w3b and 5w4b are not ONL at the same time. Now in FIGS. 3 to 5, the respective switches 5w1a and 5w1b.

5w2a and 5w2b, 5w3a and 8w3 b, S w
When 4 a and S w 4 b are turned ON, thrusts as shown in Tables 1 and 2 below are generated. Table 1: Direction of thrust generated by coil 3a Table 2: Direction of thrust generated by coil 3b The right and left sides in Table 2 are based on Figure 3.

In FIG. 5, switches 5w1a and lb are turned on.

5w2a12b OFF, 5w3a, 3b (5FF.

When 5w4a and 4b are turned on, fiL% is shown in Tables 1 and 2.
7- The IJM generates thrust to the right by the coil 3a and to the left by the coil 3b, and the secondary conductor plate 5 is positioned between the two coils 3a and 3b and stopped due to the balance of the forces in the left and right directions.

The reason why the primary side core 1 is divided into two parts, 1a and 1b in Fig. 3, is that if only the coil 3 was divided into coils 3a and 3b as shown in Fig. 3, instead of dividing the single side iron core 1 as shown in Fig. 2. When the coils 3a and 3b are excited in opposite directions, the magnetic flux rotates around each other and cancels each other out, so that the q[f: force generated becomes significantly weaker. Therefore, by dividing the next-side iron core and making the magnetic paths independent from each other, the thrust can be reduced to 1i-t.
, it can be made into an i-force.

As explained above, according to the present invention, the conventional primary side iron core and coil are made electrically by the simple method of dividing into two, and
Since ・I and ・M can be positioned to stop, vibration and noise caused by mechanical friction brakes can be prevented, and the service life can be extended.

Furthermore, compared to other electrical stop positioning methods, the structure and control are simpler.

−8=

[Brief explanation of the drawing]

FIG. 1 is a perspective view illustrating a vehicle to which the present invention is applied, Il, M, FIG. 2 is a plan view of FIG. 1 with the vehicle body removed, and FIG. 4 is a sectional view taken along line AA' in FIG. 3, and FIG. 5 is a connection diagram of FIG. 3. In the figure, 1, la, lb are the primary iron cores, 3.3a,
3b is a traveling magnetic field generating coil, 4 is a rail, 5 is a secondary conductor plate, 7 is a vehicle body, 7' is a vehicle body, 8 is a wheel, and 10 is a non-magnetic material.

Claims (1)

[Claims] A primary iron core having a traveling magnetic field generating coil is disposed on at least one side of a secondary conductor plate made of a good conductor plate guided and supported by a conveyor rail, and the traveling magnetic field generating coil is excited. Preferably, in a linear induction motor that transports the secondary conductor plate along the conveyance rail, the traveling magnetic field generating coil at a predetermined position of the secondary iron core is divided into two, and at the divided position, the traveling magnetic field generating coil is divided into two parts. - A linear induction motor characterized in that the secondary side iron core is divided into two parts, and the secondary side conductor plate is stopped and positioned by exciting the two divided coils in opposite directions.