JPH10147482A - Elevator system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve flexibility in controlling an ropeless elevator driven by a linear synchronous motor. SOLUTION: This ropeless elevator system includes a movable car, the secondary side of the liner motor provided in the car, and the primary side of the linear motor opposing to this secondary side. In this system, the secondary side is provided with a first leg La fixed to a secondary leg Lb, forming a passage, and this first leg La forms a clearance section. In addition, the secondary side has a permanent magnet arranged in the clearance section and a conductive coil W, which is coiled around a part of the second leg Lb and passes through the passage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to low-press elevator systems, and more particularly to such systems using a linear synchronous motor.

[0002]

BACKGROUND OF THE INVENTION The present invention is a related application of the following application, which is a pending patent application filed concurrently with the present application and shared by the present applicant.

1) Ernest P. U.S. Patent Application No. (Attorney Docket No. OT-2794) entitled "Low Press Elevator Apparatus with a Secondary Synchronized Linear Synchronous Motor" 2) Ernest P. U.S. Patent Application (Attorney Docket No. OT-2796) by Gagnon et al., Entitled "Low-press elevator apparatus having a linear induction motor including a winding secondary member" Low-press elevator apparatuses driven by linear motors are well known. It is. For example, US Pat. No. 5,158,
No. 156, No. 5,288,956, No. 5,235,1
No. 44, 5,197,570, 5,234,07
9 and Canadian Patent Application No. 2,085,309.

[0004]

In some low-press elevators, linear syncronus motors (LSMs) are used to obtain the propulsion of the elevator. In a conventional LSM, the secondary permanent magnets form a fixed magnetic field based on the geometry of the LSM and the characteristics of the secondary permanent magnets (PMs).
In this type of LSM, the motor can be controlled by a fluctuating magnetic field generated on the primary side of the motor. Further, a magnetic field is usually generated by the secondary permanent magnet, and an attractive force is generated between the secondary side and the primary side of the LSM, thereby making it difficult to install, operate, and maintain the motor. .

It should be noted that US Pat. No. 4,064,442, entitled “Electric Motor with Permanent Magnet and Resonant Circuit,” by Svieta, registered Dec. 20, 1977, is hereby incorporated by reference in its entirety. . Other references include e. R. 1 by rice weight
IEEE Bulletin No. 63, February 975, Vol. 2, pp. 250-289, "Linear Electric Machines-A Personal Perspective",
Ian Breeze et al., Jan. 26, 1989, Machine Design, pp. 91-96, "Using Linear Motors for Material Handling," I. Bordea and S.
A. Handbook of electric machines by Neisa, pages 7-1 to 7-41, "Linear Electric Machines", G. R. Elevator and Escalator 2nd edition 9-12, published by John Wiley & Sons, 1983, by Strakossi
There is a page, "Three-Dimensional Transportation", Popular Science, page 25, "Elevator Using a Linear Motor", published in February 1991, and Alfred Bellucci, "Special AC Motors and Their Industrial Use", pages 52-54. These too
All are incorporated herein by reference.

The present inventors have proposed a linear motor (in particular, LS
We believe that low press elevator systems driven by M) will be improved.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a low-press elevator system has a linear motor (eg, LSM) with a hybrid secondary. This hybrid secondary makes it possible to control or vary the magnetic field generated by the secondary,
The magnetic flux in the gap of the SM is also controlled. As shown in FIGS. 1A and 1B, the hybrid secondary side has, for example, a permanent magnet and a wound coil. This coil is electrically excited to generate a magnetic field. The magnetic field generated on the motor secondary side is generated by the magnetic field generated by the permanent magnet and the coil wound and excited. This configuration provides a novel mechanism for actively controlling the magnetic field on the secondary side of the LSM by electrically controlling the current flowing through the secondary winding.
This mechanism is based on the conventional LSM using only permanent magnets.
In contrast to the fixed magnetic field generated by the secondary.

Accordingly, in the low-press elevator apparatus, that is, the low-press elevator system according to the present invention, a movable cab or a movable car and at least one linear member appropriately provided (for example, fixedly provided) in the movable car. It has a motor secondary side and at least one linear motor primary side facing the secondary side. Here, the secondary side has a first leg fixed to a second leg to define a (magnetic flux) path, the first leg also defining an air gap. The secondary side further includes a permanent magnet disposed in the gap, and a coil wound around a part of the leg on the secondary side and passing through the passage and having conductivity. These first and second legs are formed of a suitable material that is timely acceptable.

It is an object of the present invention to improve magnetic flux control in a low-press elevator system driven by a linear motor.

Another object of the present invention is to improve the control of magnetic flux in a low-press elevator system driven by a linear synchronous motor.

Another object of the present invention is to facilitate the operation and maintenance of the linear synchronous motor of the low-press elevator system.

[0012] Further objects of the present invention will become more apparent from the following description of embodiments and the accompanying drawings.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 illustrates that the installation, operation and maintenance of a permanent magnet motor (PM motor) are facilitated by controlling the magnetic flux, and FIG. 2 illustrates the integration of the magnetic flux control into the linear synchronous motor. is there.

An advantage of the permanent magnet (PM) synchronous device is that it does not require a source for electrically exciting and is efficient. Furthermore, high energy density PM material,
For example, neodymium iron boron,
Samarium cobalt is known and has been used to obtain high propulsion while reducing equipment size.

However, a common difficulty in driving a low-press elevator is that a single-sided LSM (single sided LSM) cannot eliminate a magnetic field generated by a permanent magnet. Installation, operation and maintenance are very difficult. The present inventors believe that this difficulty can be solved by the magnetic flux control technique according to the present invention shown in FIG. 1 and the like.

The basic configuration of the present invention includes, for example, a soft iron magnetic circuit having a leg La. This circuit has legs La and Lb and salient poles P1 and P2. Leg La
, A coil W is wound (see FIG. 1A). The second leg Lb has a gap in which a permanent magnet is arranged, while the salient poles P1 and P2 are formed by legs of two further soft iron magnetic circuits. FIG.
As shown in (a), when the coil current is not flowing, the magnetic flux (dotted line) from the permanent magnet is actually "short-circuited" by the soft iron leg La on which the coil W is wound. .

The most characteristic feature of the present invention is that the current I flows in the coil (by appropriate means such as an on-board controllable power supply) and is reversed by the current in the coil from the magnetic field of the permanent magnet. The point is that a magnetic field in the direction is formed. By supplying a sufficient current to the coil, the magnetic field in the leg La can be made zero. In this case, as shown in FIG. 1 (b), the magnetic flux generated by the permanent magnet
Appears at P2. For example, by further increasing the current I in the coil W, the magnetic field in the leg La can be further increased. The limit of the magnitude of the magnetic field is determined by the saturation amount of the legs La and Lb made of soft iron or another magnetically acceptable material. The magnetic flux further generated by the coil appears at salient poles P1 and P2, thereby increasing the total amount of magnetic flux in the gap.

The advantages of the present invention are that 1) a magnetic flux control technique capable of actually eliminating the magnetic flux of the permanent magnet when the current in the coil is zero is obtained; and 2) electrical excitation in the coil. Depending on the state, the magnetic flux density in the air gap can be controlled. 3) In addition to the magnetic field of the permanent magnet, increasing the magnetic field of the coil makes it easier to control and operate the magnetic flux in the air gap. Can be

Although the present invention has been described based on the preferred embodiments, those skilled in the art will appreciate that various modifications and alterations can be made to the above-described embodiments without departing from the spirit and scope of the present invention described in the claims. Modifications can be made.

In summary, according to the present invention, a movable cab (cage or cab), a secondary side of a (for example, fixed) linear synchronous motor provided in the cab, and a linear opposed to the secondary side. And a primary side of a synchronous motor. On the secondary side,
A first leg fixed to the second leg to form a passage, the first leg also defining a void. Further, the secondary side has a permanent magnet disposed in this gap,
A conductive coil wound around a part of the second leg and passing through the passage. By controlling the current in this coil, it is possible to influence the magnetic field generated by the permanent magnet.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a linear synchronous motor according to the present invention having a hybrid secondary side, in a state where a coil current is not flowing (a) and a state where a coil current is flowing (b). .

FIG. 2 is a detailed explanatory view of FIG. 1;

FIG. 3 shows a car C according to the invention, movably arranged in the hoistway and fixed to a plurality of hybrid secondary sides S;
Explanatory drawing of two primary sides P fixed to a hoistway wall surface.

[Explanation of Signs] La, Lb: Leg P1, P2: Salient pole W: Coil

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Zbig New Peach Midtown Farm Road 81, East Hampton, Connecticut United States of America 81 (72) Inventor Kenji Oshima 2-10-1 Nakagawa, Tsuzuki-ku, Yokohama, Kanagawa Pref. 100 East Eminence 1004

Claims (6)

[Claims] 1. A low-press elevator system, comprising: a movable cage; a linear motor secondary side provided in the car; and a linear primary side facing the secondary side, wherein the secondary side is provided. Comprises a first leg fixed to a second leg to form a passage, the first leg forming a void, and the secondary side further comprising a permanent member disposed within the void. A system comprising: a magnet; and a conductive coil wound around a portion of the second leg and passing through the passage. 2. The system of claim 1, wherein said first leg and said second leg comprise a metal material. 3. The system according to claim 2, wherein said metal material is iron. 4. The system of claim 2, wherein said permanent magnet comprises neodymium iron boron. 5. The system of claim 3, wherein said permanent magnet comprises samarium cobalt. 6. A third leg and a fourth leg extending from the second leg and having ends respectively facing the primary side, wherein the permanent magnet generates a magnetic flux, and The system of claim 1, wherein a majority of the passes pass between the ends and between the ends.