JP2753183B2 - Linear induction motor and linear induction motor type transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear induction motor, and more particularly, to a novel structure of a primary unit having an AC magnetic field generating portion, which is a power supply side of the linear induction motor, and a linear induction motor having the primary unit. The present invention relates to a motor-type transfer device.

[0002]

2. Description of the Related Art In a linear induction motor having a configuration in which a rotary induction motor is cut open and developed on a plane, a primary coil on the power supply side and a secondary conductor on the power supply side face each other via a gap. Having a structure. On the secondary side, a conductor and a magnetic material are often used in combination. Either the primary side or the secondary side can be movable and the other can be fixed, and is used for a pallet transport device, a crane, and the like.

FIG. 4 is an external view of a main part of a conventional linear induction motor type transfer apparatus. On both sides of the chassis 30, the magnetic field generating units 40a and 40b are fixedly held by four mounting feet 41, respectively.

Each of the magnetic field generating units 40a and 40b is made of a magnetic material such as an iron core (not shown) and a coil (not shown) wound around the iron core, and is integrally formed by resin molding. When an alternating current flows, an alternating magnetic field is generated in the iron core. The AC magnetic field generates an eddy current on the conductor rail 50 which also serves as a U-shaped transfer rail. A propulsion force is generated by a traveling magnetic field generated by passing an alternating current through the primary coil and an eddy current generated in the secondary-side conductor rail 50 by the traveling magnetic field.

[0005] Wheel devices 31 are provided before and after the chassis 30 so that the entire chassis 30 can be supported and moved on the conductor rails 50. Although not shown, another wheel device is attached to the chassis 30 to position and support the chassis 30 in the left-right direction with respect to the conductor rail 50.

Although not shown in the drawings for the sake of simplicity, a carriage is attached to the bottom of the chassis 30, and articles are mounted on the carriage and moved. Chassis 3
When a transfer cart is provided at the bottom of the zero, a suspension type linear induction motor type transfer device is obtained. Alternatively, if a carrier is provided on the upper part of the chassis 30, it becomes a bottom-type linear induction motor type carrier. In addition to the above, various types of mechanical components and accessory devices required for the transport device may be attached to the chassis 30 of the actual transport device.

[0007] The AC current on the primary side is supplied to the transfer rail 50.
Are supplied to the coils of the magnetic field generating units 40a and 40b by a current collector provided on the chassis 30 from a power supply line disposed along the line, but these are also not shown.

[0008]

In the linear induction motor used in the above-described transfer apparatus, the moving speed is controlled by controlling the duty ratio of an alternating current flowing through the coil of the magnetic field generating unit or by applying the voltage to the coil. This is done by controlling the applied voltage. In order to expand the speed control range, it is necessary to improve the duty ratio or the voltage value that can be continuously applied.

When the duty ratio or the voltage value increases, the average current value flowing through the coil increases, and heat is generated due to the loss of the iron core and the coil. In the linear induction motor type transfer device, the generated heat must be appropriately radiated. In order to improve the duty ratio and the voltage value, it is important to improve the heat radiation efficiency of the primary unit.

In a conventional linear induction motor, as shown in FIG. 4, the magnetic field generating units 40a and 40b are fixedly held by, for example, four mounting feet 41, respectively. One end of the mounting foot 41 is connected to the magnetic field generating units 40a and 40b.
And the other end is fixed to the chassis 30.

A part of the heat generated by the conventional magnetic field generating units 40a and 40b is directly radiated to the atmosphere, and the other part is radiated to the chassis 30 via the mounting feet 41, as schematically shown by waveform arrows. I do. In the latter case, the heat generated in the coil and the iron core is transmitted to the chassis 30 through the mounting feet 41 via the mold resin, and is radiated to the surroundings by the chassis 30.

The molding resin of the magnetic field generating units 40a and 40b generally has extremely poor heat conduction as compared with a metal material or the like, and the thin mounting feet 41 have high thermal resistance.
Further, even if the chassis 30 itself is made of a metal material, a structure suitable for heat dissipation has not been considered. Therefore, the heat radiation efficiency was not good in the conventional linear induction motor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a linear induction motor and a linear induction motor type transfer device capable of improving the heat radiation efficiency and improving the duty ratio and voltage value of the primary coil.

[0014]

According to the present invention, there is provided a magnetic field generator having a core made of a magnetic material, and a winding wound around the core to generate an AC magnetic field through which the AC current flows. In a primary unit of a linear induction motor including a member and a chassis member holding the magnetic field generating member, a radiation fin is integrally formed with the chassis member, and a surface close to a surface on which the radiation fin is formed and the magnetic field generation member are formed. Opposing surfaces are respectively provided on the main surfaces of the members, and the two members are brought into close contact with each other on the opposing surfaces to hold the magnetic field generating member on the chassis member. It is characterized by being covered with.

Further, in the linear induction motor type transfer device of the present invention, in addition to the primary unit, a transfer table is further provided on a chassis member, and an eddy current is generated by an alternating magnetic field generated by a magnetic field generating member. A secondary conductor rail disposed in close proximity to the magnetic field generating member and a gap, and the chassis member is moved relative to the secondary conductor rail so that the carriage can move on the secondary conductor rail. And support means.

[0016]

The heat generated by the magnetic field generating member is substantially directly transmitted to the chassis member with low thermal resistance via the opposing surface of the magnetic field generating member and the chassis member that are in contact with the close contact surface, and is formed on the chassis member. The heat radiation fins dissipate heat effectively to the surroundings.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A linear induction motor according to an embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is an assembly view of a main part of a primary unit of a linear induction motor according to an embodiment of the present invention. FIG.
In this case, the chassis 10 is integrally formed by aluminum die-casting having a high heat radiation effect, and a large number of heat radiation fins 11 are arranged and arranged on the inner wall surfaces facing each other. A through hole 12 is formed between the inner wall on which the radiating fin 11 is formed and the outer wall on the opposite side.
Thereby, the magnetic field generating units 20a and 20b are attached.

The magnetic field generating units 20a of the chassis 10
The surfaces 15a and 15b facing the surface 20b and the surfaces 21a and 21 facing the chassis 10 of the magnetic field generating units 20a and 20b.
b is a flat surface and is worked so as to be in close contact with each other. In particular, the entire magnetic field generating units 20a and 20b are resin-molded, but the opposing surfaces 21a and 21b are not resin-molded so that the iron core is exposed.

Facing surfaces 15a and 15b of the chassis 10;
Opposing surfaces 21a, 21 of magnetic field generating units 20a, 20b
Although b can be in direct contact, it is preferable that the chassis 10 and the magnetic field generating units 20a and 20b be tightly connected to each other with a good heat conductive material such as a silicone resin interposed therebetween in order to improve heat conduction.

When the linear induction motor shown in FIG. 1 is used as a linear induction motor type transfer device, the configuration of the prior art described with reference to FIG. 4 can be used as it is except for the chassis and the magnetic field generating unit. Therefore, a wheel device 14 is provided before and after the chassis 10 to support the chassis 10 movably on the transport rail.

As means for supporting the chassis 10 on the transport rail so as to be movable, it goes without saying that other than the wheel device 14 of the embodiment, a device utilizing a magnetic reaction force, an air bearing or the like may be used as appropriate. In addition, Japanese Utility Model Application No. 2-1187 for a utility model registration application filed by the same applicant as the present application.
The present invention is also applicable to the linear induction motor described in the specification and drawings of No. 63.

Next, FIG. 2 shows a plan view (A) and a side view (B) of the chassis 10 of the linear induction motor according to the embodiment of the present invention. FIG. 2A is a view of the chassis 10 as viewed from a vertical direction of the transport surface. The chassis 10 has a housing shape as a whole, and the radiating fins 11 that come to the positions of the through holes 12 are partially cut away so as to be able to tighten the screws 13 so as to be lower than other portions or are omitted. You.

The front and rear of the chassis 10 are formed with a projection 16 having a hole through which the axle of the wheel device 14 passes. Chassis 10
In addition, screw holes and through holes may be formed in the to allow attachment of other accessory parts other than those described above.

FIG. 2B shows the case where the chassis 10 is
It is the figure seen from b side. A magnetic field generating unit 20 is provided on the hatched portion of the facing surface 15b via a silicone resin.
b faces opposing surfaces 21b.

The numbers and positions of the through holes 12 and the screws 13 are not particularly limited, and may be appropriately selected according to the viewpoint of the mechanical strength or the shape. There is no limitation on the number or shape of the radiation fins 11. Further, the overall shape of the chassis 10 is not limited to the housing shape of the embodiment, and another shape may be adopted. A material other than aluminum can be used as the material.

Next, FIG. 3 shows a magnetic field generating unit 20a (the same applies to 20b) of the linear induction motor according to the embodiment of the present invention.
2A and 2B are a plan view and a side view, respectively. (A) of FIG.
FIG. 4 is a diagram of the magnetic field generation unit 20a as viewed from a vertical direction of a transport surface.

This shows a state in which the mold resin on the unit is removed so that the internal structure can be seen. An iron core 22 is formed by stacking a large number of plates having the illustrated shapes in which a number of comb-shaped slots 23 are formed by punching a thin iron plate and tightening and fixing them with bolts 24.

A coil 25 is wound around the iron core through the slot 23, and the portion other than the facing surface 21a is
It is resin molded with a thickness of about mm. Accordingly, the iron core 22 is exposed on the facing surface 21a.

FIG. 3B is a view of the magnetic field generating unit viewed from the direction of the facing surface 21a. The facing surface 21a has eight female screw holes 26 for coupling with the chassis 10. As shown in FIG.

The present invention is not limited to the shape and material shown in FIG. 3, but may be appropriately selected according to desired performance including the number and shape of the slots. In addition to the embodiments of the invention described above, when the heat radiation performance is not sufficient with natural air cooling of the radiation fins 11, the air-cooling fan is connected to the chassis 1
The radiation fin 11 may be forcibly air-cooled by being attached to the lower part of the radiation fin 11 or the like.

The present invention has been described in connection with the preferred embodiments.
The present invention is not limited to these. For example,
It will be apparent to those skilled in the art that various modifications, improvements, combinations, and the like can be made.

[0033]

As described above, the magnetic field generating unit and the chassis are in close contact with each other on a wide facing surface, so that a heat conduction path having a low thermal resistance is formed between the two, and the heat generated in the coil and the core is quickly passed through the facing surface. Since the heat escapes to the chassis and is effectively dissipated by the heat dissipating fins of the chassis, good heat dissipation efficiency can be obtained, and thus the duty ratio of the coil can be improved.

[Brief description of the drawings]

FIG. 1 is an assembly external view of a main part of a linear induction motor according to an embodiment of the present invention.

FIG. 2 is a plan view and a side view of a chassis of the linear induction motor according to the embodiment of the present invention.

FIG. 3 is a plan view and a side view of a magnetic field generation unit of the linear induction motor according to the embodiment of the present invention.

FIG. 4 is an external view showing a main structure of a linear induction motor type transfer device according to a conventional technique.

[Explanation of symbols]

 10 chassis 11 radiation fins 12 through holes 13 mounting screws 14 wheel devices 15a, 15b · Opposite surface 20a, 20b ··· Magnetic field generating units 21a and 21b ··· Opposite surface 22 ··· Iron core 23 ··· Slot 24 ··· Bolt 25 ··· ..... coil 26 ..... screw hole

Claims (5)

(57) [Claims] 1. A magnetic field generating member having a core made of a magnetic material and a winding wound around the core for generating an alternating magnetic field in the core so that an alternating current flows, and holding the magnetic field generating member. A primary side unit of a linear induction motor including a chassis member and a radiating fin formed integrally with the chassis member, and surfaces facing a surface on which the radiating fin is formed and a main surface of the magnetic field generating member facing each other. Wherein the two members are brought into close contact with each other on the opposing surface so that the magnetic field generating member is held by the chassis member, and the other than the opposing surface of the magnetic field generating member is substantially covered with a mold resin. Primary unit of induction motor. 2. The primary unit of the linear induction motor according to claim 1, wherein said magnetic field generating member is held by said chassis member with a good heat conductive material sandwiched between said opposed surfaces. 3. The chassis member has a casing structure formed by die-casting with a good heat conductive material, and the radiating fins are formed on two opposing surfaces inside the casing. The primary unit of the linear induction motor according to claim 1 or 2, wherein the magnetic field generating members are respectively held on two outer walls opposite to the formed inner wall. 4. The primary unit of the linear induction motor according to claim 3, further comprising an air cooling device for cooling the radiating fins. 5. A magnetic field generating member having a core made of a magnetic material and a winding wound around the core to generate an alternating magnetic field so that an alternating current flows, A primary unit of a linear induction motor including a chassis member that holds a table, and a magnetic field generating member disposed close to the magnetic field generating member so as to generate an eddy current by an alternating magnetic field generated by the magnetic field generating member; A secondary conductor rail forming a linear induction motor in cooperation with the magnetic field generating member; and supporting the chassis member with respect to the secondary conductor rail so that the carrier can move on the secondary conductor rail. A radiation fin is integrally formed on the chassis member, and opposing surfaces are respectively provided on a surface close to a surface on which the radiation fin is formed and a main surface of the magnetic field generating member. It was holding the magnetic field generating member to said chassis member is brought into close contact surface contacts both members linear induction motor type conveying apparatus according to claim.