KR940011705B1 - Linear induction motor for elevator - Google Patents

Abstract

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Description

Linear Induction Motor for Elevator

1 is a main perspective view of an elevator showing an embodiment of the present invention.

2 is a configuration diagram showing the linear induction motor for an elevator of FIG.

3 is a front view showing the secondary stator of FIG.

4 (a) to 4 (c) is a view showing a part of the secondary side stator according to another embodiment of the present invention, the fourth (a) is a plan view, the fourth (b) is a side view, 4 (c) is a front view.

5 is a configuration diagram showing a conventional example.

6 is a front view showing the secondary stator of FIG.

* Explanation of symbols for main parts of the drawings

(2): Primary side mover (3): Elevator car

(15): secondary stator (17): stator body

(17a): Slit (Iron core attachment) (18): Iron core

The present invention relates to an elevator induction motor for an elevator, in particular an elevator induction motor for an elevator which is used as a driving device of an elevator.

BACKGROUND ART Conventionally, an elevator car using a linear induction motor as a driving apparatus, for example, is described in Japanese Patent Laid-Open No. 57-121568.

FIG. 5 is a configuration diagram showing a conventional induction motor for a flat plate type dual-axis elevator similar to that shown on pages 14 to 27 of "Linear motors and their applications" (published in Japanese Society of Electrical Engineers, March, 59).

In the figure, the secondary stator 1 of thickness t made of aluminum is provided in the hoistway (not shown) of the elevator so as to extend up and down.

In the balance weight (not shown) which moves up and down along the secondary side stator (1), a primary side mover (2) consisting of a primary side core (2a) and a winding (not shown) is installed with the secondary side stator (1) in between. It is.

Although the primary side mover 2 is divided on both sides of the secondary side stator 1 in the drawing, these parts are connected to each other and are integrally formed.

On both sides of the secondary stator 1, g gaps 3 and 4 exist between the primary side movers 2, respectively.

In the conventional linear induction motor for elevators configured as described above, when an alternating current flows through each winding of the primary side mover 2, the magnetic flux 5 as shown in the arrow of FIG. 5 is generated according to the law of the right hand screw.

This magnetic flux 5 moves with time.

On the other hand, the secondary side stator 1 flows the eddy current 6 as shown in FIG. 6 by the magnetic flux 5.

From this magnetic flux 5 and the eddy current 6, a propulsion force is generated by the framing law, and the primary side mover 2 is driven.

At this time, the size of the overall magnetic gap of the linear induction motor is equal to the size of the gaps 3 and 4 plus the thickness of the secondary stator 1, that is, 2g + t.

In the conventional linear induction motor for an elevator configured as described above, the length of the secondary stator 1 becomes considerably longer along the length of the hoistway, so that the secondary stator 1 is held in a straight line with high precision. Is difficult.

On the other hand, if the size g of the gaps 3 and 4 is made extremely small, the size g of the gaps 3 and 4 may be reduced since the primary side actuator 2 may come into contact with the secondary side stators 1. It could not be made too small and therefore it was difficult to reduce the size of the overall gap of this linear induction motor.

In addition, since the secondary stator 1 is a monolithic body of aluminum, a lot of useless eddy current 7 flows through the secondary stator 1, which does not contribute to propulsion, such as the broken arrow of FIG.

As a result of the above-described overall gap problem and useless eddy current 7 problem, there is a problem that the driving efficiency cannot be increased in the conventional linear induction motor for elevators.

The present invention has been invented to solve such a problem, and an object of the present invention is to obtain a linear induction motor for an elevator which can increase driving efficiency by substantially reducing the size of the overall magnetic gap and reducing the useless eddy current. have.

This invention uses a plurality of iron core attachment holes are formed at intervals in the longitudinal direction and using a fixed capital body made of a non-magnetic conductor, and a secondary side stator with an iron core made of a magnetic material having a greater electrical resistance than the fixed capital body is installed in the core attachment hole will be.

In this invention, as the magnetic flux passing through the secondary stator passes through the iron core, the size of the magnetic gap becomes smaller, and it becomes difficult for the eddy current to flow through the iron core portion, so that the eddy current flows along the main body to reduce the useless eddy current.

An embodiment of this invention will be described with reference to the drawings.

1 is a main perspective view of an elevator having an induction motor for an elevator according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of a linear induction motor for an elevator of FIG. The description is omitted.

In the figure, two pulleys 11 are provided at the ceiling of the hoistway (not shown), and one end of the rope 12 wound around the pulley 11 is an elevator car (hereinafter referred to as " kara " 13), and Counterweights 14 are attached to the other end, respectively.

In addition, the secondary stator 15 having a thickness t is provided in two parallel directions in the hoistway.

Both side portions of the counterweight 14 are provided with a guide shoe 16 which slides along the secondary side stator 15 while the same primary side mover 2 is provided with the secondary side stator 15 interposed therebetween. have.

Moreover, the space | gap 3 and 4 of the same magnitude | size g exist between the secondary side stator 15 and the primary side mover 2 conventionally.

Each of the secondary side stators 15 includes a fixed capital body 17, which is a nonmagnetic conductor, in which a plurality of slits 17a, which are iron core attaching holes, are spaced in the longitudinal direction, and an iron core 18 inserted into the slits 17a.

Each slit 17a has an elongated shape in the width direction of the secondary stator 15 and penetrates in the thickness direction of the secondary stator 15.

The stationary capital body 17 is made of aluminum which is a nonmagnetic conductor, and the iron core 18 is made of a magnetic material having a higher electrical resistance than aluminum.

Next, the operation will be described. When an alternating current flows through the winding of the primary side actuator 2, the magnetic flux 19 like the arrow of FIG. 2 arises like a conventional example.

By the magnetic flux 19, the secondary side stator 15 flows the eddy current 20 as shown in FIG. 3, and the driving force is generated by the magnetic flux 19 and the eddy current 20, thereby causing the primary actuator 2 ) Is driven.

At this time, since the magnetic flux 19 passing through the secondary side stator 15 passes through the iron core 18, the magnitude of the magnetic gap due to the thickness t of the secondary side stator 15 is almost negligible, and thus this linear The size of the overall magnetic gap of the induction motor is almost 2 g of the size of the pores 3 and 4, which is much smaller than the conventional example.

The eddy current 20 is a useless eddy current 7 which does not contribute to the driving force as in the prior art as the eddy current easily flows intensively along the fixed capital body 17, which is a non-magnetic conductor having a small electrical resistance, and the eddy current does not flow in the iron core 18. Since the place where) flows becomes narrow, the useless eddy current 7 flowing irregularly is considerably reduced than before.

For this reason, the linear induction motor for an elevator of the above embodiment becomes more efficient than before.

In the above embodiment, although the slit 17a is formed in the stator body 17, it is indicated that the iron core 18 is simply inserted into each slit 17a. As shown in the figure, the stator body 17 may be divided into two, and the iron core 18 may be formed as one body. In this way, the assembly of the secondary stator 15 is easier than in the above embodiment.

4 (a) and 4 (b) show a state in which one part of the fixed capital body 17 divided into two is removed from the iron core 18. FIG.

In the above embodiment, aluminum is designated as the fixed capital body 17. However, the nonmagnetic material may be made of copper.

In addition, in the above embodiment, the slit 17a penetrating the stationary capital body 17 is shown as an iron core hole, but it does not need to be completely penetrated. In this case, the magnetic gap is reduced by the thickness of the iron core, and eddy currents are formed in the iron core portion. Since it is difficult to flow, some effect is obtained. The cross-sectional shape of the core attachment hole is not limited to the above embodiment.

Again, the above embodiment shows that the primary side mover 2 is installed on the counterweight 14, but this invention can be applied even if the primary side mover 2 is an elevator provided on the car 13 side.

In the above embodiment, the two-sided linear induction motor is shown, but the present invention can also be applied to one side.

As described above, the elevator linear induction motor of the present invention uses a stator main body in which a plurality of core attachment holes are formed at intervals in the longitudinal direction, and a secondary stator having iron cores installed in the core attachment hole, so that the magnetic flux passing through the secondary stator is an iron core. And thus accordingly the overall magnetic gap can be made as small as the iron core, and the eddy current flows through the stationary body with a small electrical resistance, making the useless eddy currents narrow because of the narrowing of places where they do not contribute to propulsion. Can be reduced and as a result the driving efficiency can be increased.

Claims (1)

It consists of a non-magnetic conductor and has a fixed capital body in which a plurality of core attachment holes are formed at intervals in the longitudinal direction, and an iron core installed in the iron core attachment hole and made of a magnetic material having a higher electrical resistance than the fixed capital body. The secondary stator installed in the hoistway extending in the direction and the secondary side stator are installed to face each other with a certain space adjacent to the secondary side stator. And a primary mover for elevating the elevator car by moving up and down along the secondary stator.

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