JP2583697B2 - Linear motor elevator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The invention of claims 1 and 2
The present invention relates to a linear motor elevator that raises and lowers a lifting body along a hoistway by the thrust of a linear induction motor.

[0002]

2. Description of the Related Art FIG. 4 is a perspective view showing a conventional linear motor elevator similar to that shown in, for example, Japanese Patent Application Laid-Open No. 1-271381, and FIG. 5 is a sectional view of a main part of FIG.
In the figure, a pulley 1 is provided on the ceiling of a hoistway (not shown).
Is provided. The rope 2 hung on the pulley 1
A car 3 is attached to one end, and a counterweight 4 as an elevating body is attached to the other end. The hoistway wall 5 has a section L
A secondary-side stator 7 is attached via a bracket 6 in the shape of a letter so as to extend straight in the vertical direction. The secondary stators 7 are arranged on both sides of the counterweight 4 in parallel with each other. A primary mover 8 is attached to the counterweight 4 so as to oppose both surfaces of each secondary stator 7. Further, a conventional linear induction motor is constituted by the primary mover 8 and the secondary stator 7.

FIG. 6 is an enlarged sectional view showing the linear induction motor of FIG. In the figure, a secondary stator 7 is composed of a steel material 7a that is a magnetic material and a conductor plate 7b such as copper or aluminum mounted on the surface thereof.

Next, the operation will be described. The primary mover 8 of the plate-shaped linear induction motor has a structure in which an armature of an induction motor is developed in a plate shape, and is wired so that a moving magnetic field is generated when a three-phase alternating current is supplied thereto. . Therefore, when a moving magnetic field is generated such that the opposing portions of the primary mover 8 have the same polarity while maintaining the gap between the primary mover 8 and the secondary stator 7, FIG.
As shown in FIG. 1, a magnetic flux 9 is generated in the linear induction motor.

As a result, an eddy current 10 as shown in FIGS. 7 and 8 is generated in the conductor plate 7b, and the primary movable element 8
A thrust is applied to the conductor plate 7b in the same direction as the traveling direction of the moving magnetic field 9 (the direction of arrow A in FIG. 7). As a result, the counterweight 4 travels along the secondary stator 7. The steel material 7a has a function of securing a magnetic path of the magnetic flux 9 passing through the secondary stator 7.

The secondary stator 7 disposed throughout the hoistway is divided into several parts on the way due to manufacturing and installation restrictions. Joined. Further, when the secondary stator 7 expands and contracts in the longitudinal direction (vertical direction) due to an environmental change such as a temperature change, a gap for absorbing the expansion and contraction needs to be provided in the joint (joined portion). .

FIG. 9 is an explanatory view showing the state of magnetic flux and eddy current when the primary side mover 8 passes through the joint 11 of the secondary side stator 7. When a three-phase alternating current is supplied to the primary mover 8, a moving magnetic flux 9 is generated, whereby an eddy current 10 flows through the conductor plate 7b. However, when the primary mover 8 is on the seam 11 of the secondary stator 7, the eddy current 10 does not pass through the seam 11 and passes through a different current path than when there is no seam 11. The turbulence of the current path of the eddy current 10 differs depending on the phase of the magnetic field, that is, the positional relationship between the magnetic flux 9 and the joint 11. Therefore, the thrust generated by the magnetic flux 9 and the eddy current 10 fluctuates when the primary mover 8 passes through the joint 11 of the secondary stator 7.

[0008]

In the conventional linear motor elevator constructed as described above, thrust fluctuation occurs when the primary mover 8 passes through the joint of the secondary stator 7. There was a problem that vibration occurred in the car 3 and the riding comfort was deteriorated.

SUMMARY OF THE INVENTION The first and second aspects of the present invention have been made to solve the above-described problems. When the primary mover passes through the joint of the secondary stator, It is an object of the present invention to obtain a linear motor elevator capable of preventing thrust fluctuation from occurring and improving ride comfort.

[0010]

According to a first aspect of the present invention, there is provided a linear motor elevator using a secondary stator having a cylindrical non-magnetic conductor and a magnetic body inserted in the non-magnetic conductor. It was what was.

A linear motor elevator according to a second aspect of the present invention uses a secondary stator having a cylindrical non-magnetic conductor and a magnetic body inserted in the non-magnetic conductor, and uses the secondary-side stator. Flexible magnetic material is interposed between the child joints.

[0012]

According to the first aspect of the present invention, the eddy current flowing through the non-magnetic conductor circulates around the magnetic body, so that the eddy current does not disturb even at the joint of the secondary stator.

According to the second aspect of the present invention, since the eddy current flowing through the non-magnetic conductor circulates around the magnetic material, the eddy current is not disturbed even at the joint of the secondary stator. By inserting the flexible magnetic material into the joint, the magnetic resistance of the joint is reduced, and the expansion and contraction and vibration of the secondary stator are absorbed.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; FIG. 1 is a sectional view of a linear induction motor of a linear motor elevator according to one embodiment of the present invention, FIG. 2 is a front view of a secondary stator of FIG.
Portions other than the linear induction motor are the same as those in FIG.

In FIG. 1, a secondary stator 21 comprises a rectangular cylindrical non-magnetic conductor 21a and a laminated magnetic steel 21b as a magnetic material inserted in the non-magnetic conductor 21a. Similarly, it is disposed throughout the hoistway. Non-magnetic conductor 21
Since a is for flowing the eddy current 22 circulating around the laminated magnetic steel 21b, it is necessary to use one having a small electric resistance and no seam in the circumferential direction. For this reason, as the non-magnetic conductor 21a, a material obtained by molding a drawn material such as copper or aluminum is used. In addition, laminated magnetic steel 21b
Is to form a magnetic path of the magnetic flux 9 created by the primary mover 8 so that the action of the moving magnetic field on the non-magnetic conductor 21a appears effectively. The reason for using the laminated material is that
This is to reduce eddy current loss in magnetic steel.

Next, the operation will be described. As in the conventional example, when a moving magnetic field is generated in the primary mover 8, a magnetic flux 9 is generated, an induced power is generated, and an eddy current 22 flows through the nonmagnetic conductor 21a. As a result, the primary mover 8 receives a thrust on the nonmagnetic conductor 21a in the same direction as the traveling direction of the moving magnetic field.

At this time, the current path of the eddy current 22 is different from that of the conventional example due to the difference in the structure of the secondary stator 21.
That is, the eddy current 22 circulates so as to surround the laminated magnetic steel 21b in a plane perpendicular to the longitudinal direction of the secondary stator 21. Therefore, the presence or absence of the joint 11 of the secondary stator 21 does not affect the flow of the eddy current 22. Accordingly, the primary mover 8 is
Even when passing through 11, the thrust does not fluctuate, and the riding comfort of the linear motor elevator is improved.

FIG. 3 is a sectional view showing a secondary stator 21 of a linear motor elevator according to an embodiment of the present invention. In the figure, a flexible magnetic body 23 that absorbs expansion and contraction of the secondary stator 21 is inserted (narrowed) into the joint 11 of the secondary stator 21. The soft magnetic body 23 is, for example, a soft rubber in which magnetic powder is mixed.

In such a linear motor elevator, since the flexible magnetic body 23 is interposed in the joint 11 of the secondary stator 21, a magnetic path is also secured in the gap portion of the joint 11. Therefore, the magnetic path of the moving magnetic field is not obstructed by the gap of the joint 11, whereby the reduction of the eddy current 22 due to the decrease of the magnetic flux density at the joint 11 is prevented, and the thrust fluctuation (reduction) is also prevented. In addition, vibration generated in the secondary stator 21 during operation is also
It is absorbed by the flexible magnetic body 23.

In each of the above embodiments, the counterweight 4 is shown as the elevating body, but the car 3 may be used. Further, in each of the above embodiments, the rope type linear motor elevator is shown, but a low-press linear motor elevator may be used. Further, in each of the above embodiments, the laminated magnetic steel 21b is shown as the magnetic material, but a magnetic steel that is not laminated may be used. Further, the material of the flexible magnetic body 23 is not limited to the above embodiment.

[0021]

As described above, the linear motor elevator according to the first aspect of the present invention comprises a secondary stator having a cylindrical non-magnetic conductor and a magnetic body inserted in the non-magnetic conductor. Since the eddy current flowing through the non-magnetic conductor circulates around the magnetic material, no eddy current disturbance occurs at the joint of the secondary stator, and the primary movable element It is possible to prevent a change in thrust when passing through the seam of the side stator, and to achieve an effect of improving ride comfort.

A linear motor elevator according to a second aspect of the present invention uses a secondary stator having a cylindrical non-magnetic conductor and a magnetic material inserted in the non-magnetic conductor. Since the flexible magnetic body is interposed between the stators, the magnetic resistance of the joints can be reduced and the expansion and contraction and vibration of the secondary stator can be absorbed in addition to the effects of the first aspect of the present invention. As a result, the ride comfort can be further improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a linear induction motor of a linear motor elevator according to an embodiment of the present invention.

FIG. 2 is a front view of the secondary stator shown in FIG. 1;

FIG. 3 is a sectional view showing a secondary stator of a linear motor elevator according to an embodiment of the present invention;

FIG. 4 is a perspective view showing an example of a conventional linear motor elevator.

FIG. 5 is a sectional view of a main part of FIG.

FIG. 6 is a cross-sectional view of the linear induction motor of FIG.

FIG. 7 is a side view of the linear induction motor of FIG.

FIG. 8 is a front view showing the secondary stator of FIG. 4;

FIG. 9 is an explanatory diagram showing the state of magnetic flux and eddy current when the primary mover passes through the joint of the secondary stator in FIG. 4;

[Explanation of symbols]

 4 Balance weight (elevator) 8 Primary mover 11 Seam 21 Secondary stator 21a Non-magnetic conductor 21b Laminated magnetic steel (magnetic material) 23 Flexible magnetic material

Claims (2)

(57) [Claims] 1. A flat secondary stator arranged along a hoistway, and a primary movable element mounted on a hoisting body so as to face both surfaces of the secondary stator. In a linear motor elevator that raises and lowers the elevating body by the thrust of a linear induction motor having: a secondary non-magnetic stator, a cylindrical non-magnetic conductor, and a magnetic material inserted in the non-magnetic conductor. A linear motor elevator having: 2. A flat secondary stator disposed along a hoistway, and a primary movable element mounted on a hoisting body so as to face both surfaces of the secondary stator. In a linear motor elevator that raises and lowers the elevating body by the thrust of a linear induction motor having: a secondary non-magnetic stator, a cylindrical non-magnetic conductor, and a magnetic material inserted in the non-magnetic conductor. A linear motor elevator, characterized in that a flexible magnetic material that absorbs expansion and contraction of the secondary stator is interposed at the joint of the secondary stator.