JPS6238272B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevator driven by a linear motor.

An elevator driven by a linear motor is disclosed, for example, in Japanese Patent Publication No. 47-46094, and its outline will be explained with reference to FIG.

In the figure, 1 is a hoistway, 1a is a side wall of this hoistway 1, 1b is a machine room installed at the top of the hoistway 1,
2 is a rotatable sheave provided in the machine room 1b; 2a is a brake that stops the rotation of the sheave 2;
3 is a main rope that is partially wrapped around the sheave 2; 4 is a cage suspended on one side of the main rope 3; 5 is a counterweight suspended on the other side of the main rope 3; Reference numeral 6 denotes a primary winding of a linear motor to which a multiphase AC power supply is applied to generate a vertically moving magnetic field, which is attached to the side wall 1a in close proximity to the counterweight 5, and uses the counterweight 5 as a secondary conductor. It is.

To lower the car 4, the brake 2a is released, and then a magnetic field moving from bottom to top is generated in the primary winding 6 to drive the counterweight 5 upward. This allows the main rope 3 to pass through the sheave 2 to the car 4.
It is extended to the side and lowers the car 4. When the car arrives at the destination, the power supply to the primary winding 6 is stopped and at the same time the brake 2a is activated to stop the car 4.
and stops the counterweight 5. On the other hand, in order to raise the car 4, a magnetic field moving from top to bottom is generated in the primary winding 6, and the counterweight 5 is lowered.

However, the length of the primary winding 6 in the above configuration must be at least commensurate with the vertical distance between the upper and lower floors, which is the vertical distance between the floor surfaces, and this has the drawback of being expensive.

This invention is intended to improve the above-mentioned drawbacks, and aims to provide an inexpensive elevator in which the range in which the primary winding of the linear motor is provided is approximately half the length of the lifting stroke.

An embodiment of this invention will be described below with reference to FIGS. 2 and 3.
This will be explained based on the diagram.

In the figure, 4a is the secondary conductor of the linear motor provided on the side of the car 4 facing the counterweight 5;
5b is a secondary conductor provided on the side of the counterweight 5 facing the car 4 and facing the secondary conductor 4a; 5b is a secondary conductor provided on the side of the counterweight 5 facing the side wall 1a; The primary winding of a linear motor fixed in the hoistway 1 is arranged between the area where the secondary conductor 4a goes up and down and the area where the secondary conductor 5a goes up and down, and the secondary conductors 4a and 5a reach it. The iron core 7 is disposed from the highest point to the position where the secondary conductor 4a and the secondary conductor 5a face each other, and has comb-shaped protrusions on the A side and the B side, respectively, and is penetrated by this iron core 7. , a winding 8 inserted into the recess, and a terminal plate 9 to which three-phase AC power supplies R, S, and T are connected so as to generate vertically moving magnetic fields along the A side and the B side, respectively. The A side faces the secondary conductor 4a to form a linear motor, and the B side faces the secondary conductor 5a to form a linear motor. 6a is a primary winding provided on the side wall 1a of the hoistway 1 and facing the secondary conductor 5b to constitute the linear motor; when the lower end of the secondary conductor 4a faces the lower end of the primary winding 6, the Secondary conductor 5b
It is disposed upward from the height at which the upper end is located to the height at which the lower end of the primary conductor 6 is located, and has the same configuration as that shown in FIG. 3. 6b is a control device that is provided in the machine room 1b and controls the primary conductors 6 and 6a;
6c is a power feed line from the control device 6b to the primary conductor 6a, and 6d is a power feed line to the primary conductor 6b. The rest is the same as in FIG.

In the elevator configured as described above, the case where the car 4 is lowered will be explained. It is assumed that the car 4 is stopped at the top floor and the secondary conductor 4a is facing the primary winding 6. First, the brake 2a
After opening, the three-phase AC power supply R generates a magnetic field moving from top to bottom in the primary winding 6, and generates a magnetic field moving from bottom to top in the primary winding 6a,
Connect S and T to the terminal board 9. Since the secondary conductor 4a is attracted by the moving magnetic field created by the primary winding 6, the car 4 is driven downward. On the way, when the secondary conductor 4a and the secondary conductor 5a reach the position where they face each other, the lower end of the secondary conductor 5b starts to come off from the primary winding 6, and the upper end of the secondary conductor 5b starts to face the primary winding 6a. . As a result, the car 4 is directly driven downward by the primary winding 6, and the secondary conductor 5b is attracted by the primary winding 6a, so that the counterweight 5
It is also driven downward by being driven upward. When the secondary conductor 4a descends to a position where it no longer faces the primary winding 6, the secondary conductor 5b completely faces the primary conductor 6a, and its upper end reaches the lower end of the primary winding 6. At this time, the connection of the three-phase AC power supplies R, S, and T to the terminal plate 9 is switched to move the magnetic field of the primary winding 6 from the bottom to the top. As a result, the counterweight 5 is passed from the primary winding 6a to the primary winding 6, and is driven upward to lower the car 4. When the car 4 arrives at the destination floor, the primary winding 6,
The car 4 and the counterweight 5 are stopped by stopping the power supply to the car 6a and simultaneously applying the brake 2a to stop the sheave 2.

Next, a case in which the car 4 is raised will be explained. Assume that the car 4 is now stopped at the lowest floor, and the secondary conductor 5a faces the primary winding 6. First, after opening the brake 2a, the primary windings 6, 6
Three-phase AC power supplies R, S, and T are connected to a to generate a magnetic field that moves from top to bottom. This results in
Since the counterweight 5 is driven downward, the car 4 rises. On the way, the counterweight 5 is driven downward as the drive by the primary winding 6 and the secondary conductor 5a is taken over by the drive by the primary winding 6a and the secondary conductor 5b. The secondary conductor 5b completely faces the primary winding 6a, and its upper end reaches the lower end of the primary winding 6. At this time, the connections to the three-phase AC power supplies R, S, and T are switched to move the magnetic field of the primary winding 6 from the bottom to the top. When the counterweight 5 is further driven downward by the primary winding 6a, the secondary conductor 4a begins to face the primary winding 6 and is directly driven upward, and
By driving the counterweight 5 downward, it is also driven upward. When the secondary conductor 5b descends to a point where it no longer faces the secondary conductor 6a, the secondary conductor 4a completely faces the primary winding 6 and is directly driven upward by the primary winding 6. When the car 4 arrives at the destination floor, the car 4 and the counterweight 5 are stopped in the same manner as described for lowering the car 4. In the case of this embodiment, the total length of the primary windings 6, 6a can be reduced to about half of the lifting stroke, so labor-saving installation work can be achieved, and an inexpensive elevator can be made. can.

Note that the primary windings 6 and 6a are similar to those in which a stator of a three-phase induction motor is expanded to generate a vertically moving magnetic field. Therefore, since the specific connection of the coil 8 is well known, the explanation will be omitted. Furthermore, switching the moving direction of the moving magnetic field is the same as switching the rotation direction of a three-phase induction motor, and since this is well known, the explanation will be omitted. Further, in the above embodiment, the primary winding 6 is connected to the hoistway 1.
However, it is clear that it will function similarly even if it is provided at the bottom of the hoistway 1. In FIG. 2, the control device 6b is located in the machine room 1b at the top of the hoistway 1.
Since the primary winding 6 is provided above, the primary winding 6 is disposed above. In this way, the control device 6b
By installing the primary winding 6 on the side closer to the power supply line 6c, there is an advantage that the power supply line 6c can be shortened. Also,
In the above embodiment, the moving magnetic field is generated in the entire primary windings 6, 6a, but the secondary conductors 4a, 5
It is also possible to excite only the portion of the coil 8 facing the coils a and 5b.

FIG. 4 shows another embodiment for shortening the installation length of the primary winding, and in the figure, 1
Reference numeral 1 is rotatably attached to the top of the counterweight 5, and the main rope 3 is wound around the suspension wheel for suspending the counterweight 5, and the other parts are the same as those shown in FIG.
In this embodiment, the moving distance of the counterweight 5 is:
It will be half of that of basket 4. Therefore, the length of the secondary conductor provided on the counterweight 5 and the primary winding 6 constituting the linear motor is only about half the length of the lifting stroke, making it possible to obtain an inexpensive elevator.

As described above, this invention provides the secondary conductor of the linear motor on the side of the car facing the counterweight and the side of the counterweight facing the car, and between the areas where the secondary conductor moves up and down. So, and
By providing the primary winding of the linear motor above or below the position where the secondary conductors face each other, the secondary conductor of either the car or the counterweight can face the primary winding. This is what I did. As a result, the range in which the primary winding is provided can be made shorter than the lifting stroke, resulting in an inexpensive elevator.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a hoistway showing the concept of an elevator using a conventional linear motor, and FIGS. 2 and 3 show an embodiment of an elevator according to the present invention.
2 is a view corresponding to FIG. 1, FIG. 3 is a partially omitted perspective view showing the primary winding of a linear motor, and FIG. 4 is a view equivalent to FIG. 1 showing another embodiment of the elevator according to the present invention. be. In the figure, 1 is a hoistway, 2 is a sheave, 3 is a main rope, 4 is a cage, 4a is a secondary conductor of a linear motor,
5 is a counterweight, 5a is a secondary conductor of the linear motor, 6 is a primary winding of the linear motor, and 6b is a control panel of the linear motor. In addition, the same parts or corresponding parts in the figures are indicated by the same reference numerals.

Claims (1)

[Scope of Claims] 1. In a hoistway in which a car and a counterweight are respectively suspended on both sides of a main rope wrapped around a sheave, the side surface of the car facing the counterweight and the , a secondary conductor of the linear motor is provided on the side surface of the counterweight facing the car, and the secondary conductor is between the areas where each of the secondary conductors moves up and down, and the secondary conductor is located above or above the position where the secondary conductor faces each other. A linear motor-driven elevator characterized in that the primary winding of the linear motor is arranged to extend downward. 2. In a hoistway with a car and counterweights suspended on both sides of the main rope wrapped around a sheave, a control device for controlling the linear motor is provided in the machine room at the top or bottom of the hoistway. , and a secondary conductor of the linear motor is provided on a side surface of the car facing the counterweight and a side surface of the counterweight facing the car, respectively,
The primary winding of the linear motor is located between regions in which each of the secondary conductors moves up and down, and extends upward or downward from the position where the secondary conductors face each other and toward the side where the control device is provided. A linear motor-driven elevator characterized by a line.