JPH0439286A - Linear motor elevator - Google Patents

Abstract

PURPOSE:To increase the travel distance of a cage by fixing the primary side of a linear motor at an elevating passage wall, installing the secondary side of the linear motor at a balance weight, and passing the cage installing end of a rope and the other end through an auxiliary sheave installed at the upper edge of the balance weight to fix it at a hitch part disposed at the upper edge part of the elevating passages. CONSTITUTION:The primary side 8 of a linear motor is fixed at the wall of an elevating passage 1, and the wire is also fixed at the wall. Besides, the secondary side 9 of the linear motor is installed at a balance weight 5, and an auxiliary sheave 2a is integratedly installed at the upper edge of the balance weight 5. Then one end of a rope 3 which a cage 4 hangs at the other end is made to pass through a main sheave 2 and the auxiliary sheave 2a, and is connected with the hitch part 11 installed at the upper edge of the elevating passage 1 to hang the auxiliary sheave 2 between the hitch part 11 and the main sheave 2. It is thus possible to eliminate traveling of a wire to feed power to the primary side 8 of the linear motor and improve safety.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a linear motor elevator that raises and lowers a car and a counterweight in a hoistway by driving a linear motor.

(Prior Art) An induction linear motor obtains propulsive force through the interaction between a moving magnetic flux generated in a coil and an eddy current generated in a metal plate. Since the use of the linear motor in an elevator has advantages such as simplifying the entire device and saving space, various proposals have been made regarding linear motor elevators.

First, a conventional elevator linear motor will be explained. As shown in FIGS. 2(a) and 2(b), a large number of coils 14 are provided around the teeth 13 of a laminated plate 12 on the primary side of the linear motor, and two-phase or three-phase alternating current is supplied to the coils through wiring 10. 14, and a traveling magnetic flux B is generated. Then, an eddy current ■ is induced in the metal plate 15 on the secondary side close to the laminate plate 12 on the negative side, and the magnetic flux induced by the eddy current interacts with the magnetic flux B on the negative side to create a propulsive force. Generate F.

FIG. 3 shows a conventional linear motor elevator.

A sheave 2 is rotatably attached to the upper end of the hoistway 1, and a lobe 3 is wrapped around the sheave 2 and hangs down into the hoistway 1. A car 4 is connected to one end of the lobe 3, and a counterweight 5 is connected to the other end, each of which is suspended vertically movably along a guide rail 6.7 disposed within the hoistway 1.

In addition, a primary side 8 of a beam near motor, that is, a coil is provided on the counterweight 5 (it may also be provided on the car 4).
A metal plate 9, which is the secondary side of the near motor, is fixed to the wall of the hoistway 1. By supplying power to the primary side 8 of the linear motor through the wiring 10, a traveling magnetic flux is generated on the primary side 8 as described above, and a propulsive force is generated by interaction with the wax current induced on the secondary side 9. . This propulsive force is transmitted from the counterweight 5 to the car 4 via the lobes 3, and causes the counterweight 5 and the car 4 to move up and down relative to each other via the lobes 3.

As mentioned above, in the conventional linear motor elevator, the primary side 8 of the linear motor is connected to the car 4 of the elevator,
The secondary side 9 has typically been provided within the hoistway 1 (for example on its wall).

(Problem B to be solved by the invention) However, as described above, in the conventional linear motor elevator, the negative side 8, that is, the coil was attached to the counterweight 5 (or the car 4), so the wiring 10 was attached to the car 4. Or it must be moved together with the counterweight 5. Therefore, (1) there is a risk that the car 4 etc. may vibrate due to the swinging of the wiring 10, and the wiring 10 may be caught on a protrusion in the hoistway 1 and break, (II) When the car 4 or the counterweight 5 reaches the lowest stage, There is a risk of wire breakage due to bending of the wire 10.

(iii) There were problems such as a large torque difference between the top floor of the building where the wiring 10 extends and the bottom floor where the wiring 10 slackened, raising concerns about durability.

Furthermore, in conventional linear motor elevators, the car and the counterweight were directly connected, making it impossible to move the car over a large distance.

The present invention was made to eliminate the drawbacks of conventional linear motor elevators, and by fixing the primary side of the linear motor to the hoistway without attaching it to a moving part, such as a counterweight (or car), wiring The purpose of the present invention is to provide a near-motor elevator that eliminates the need to expand and contract the linear motor, shortens the operating distance of the linear motor, and allows the car side lift stroke to be as large as possible.

[Structure of the invention]

(Means for Solving the Problems) The linear motor elevator of the present invention fixes the primary side of the linear motor to the wall of the hoistway, attaches the secondary side of the linear motor to a counterweight, and attaches the secondary side to the upper end of the counterweight. The sheave is integrally attached, the end of the lobe on the counterweight side is fixed to a hit part provided at the end of the hoistway, and an auxiliary sheave is suspended between the hit part and the sheave.

(Function) In the linear motor elevator of the present invention having the above configuration,
Because the wiring is connected and the primary side of the near motor is fixed to the hoistway, the car and counterweight can be raised and lowered without the wiring moving.Also, since the secondary side of the linear motor is attached to the counterweight, the balance weight While the travel distance becomes shorter, the elevator car's vertical travel becomes longer.

(Example) The following is a first example of the linear motor elevator of the present invention.
This will be explained using figures.

In the linear motor elevator of the present invention, a sheave 2 is rotatably installed at the upper end of a hoistway 1, and a lobe 3 is wrapped around the sheave 2 and hangs down into the hoistway 1. One end of the lobe 3 is fixed to the car 4, and the other end of the lobe 3 is fixed to a hit part (lobe fixing part) 11 at the upper end disposed in the hoistway 1. Further, an auxiliary sheave 2a is integrally provided at the upper end of the counterweight 5. The auxiliary sheave 2a has a port 3 between the sheave 2 and the hitch part 11.
is suspended by. Basket 4 and counterweight 5
and can move up and down along rails 6 and 7, respectively, set up in the hoistway 1.

As shown in FIG. 3, the primary side of the beam linear motor was conventionally attached to the counterweight 5, but according to the present invention, as shown in FIG. is installed. The primary side 8 of the linear motor faces the secondary side 9 attached to the counterweight 5 in the hoistway 1.
The wiring 10 to the -next side 8 is also fixed to the wall of the hoistway 1.

By supplying power to the primary side 8 of the linear motor through the wiring 10 fixed to the wall, magnetic flux is generated in the coil on the negative side 8, and this magnetic flux induces an eddy current in the secondary side 9, where the secondary The side 9 receives the propulsion force and drives the car 4 up and down along the hoistway 1 via the lobe 3. that time,
Since the counterweight 5 is suspended from the lobe 3 via the auxiliary sheave 2a, the roving ratio is 2:1, and the moving distance of the car 4 is 2 for the moving distance of the counterweight 5.
It will be doubled.

〔Effect of the invention〕

According to the present invention, the primary side of the linear motor is fixed to the hoistway, and the secondary side is also fixed to the counterweight, so the wiring that supplies power to the primary side of the linear motor does not move, which may cause a failure. disappears. Furthermore, since the counterweight is suspended from the lobe via the auxiliary sheave, the car can be moved over a large distance.

Therefore, a safe and economical near motor elevator can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a partial vertical sectional view showing an embodiment of the linear motor elevator of the present invention, Fig. 2 shows the principle of the linear motor, and Fig. 2 (a) is a schematic side view of the primary and secondary sides of the motor. , FIG. 2(b) is a diagram showing changes in the generated magnetic flux, eddy current, and thrust, and FIG. 3 is a partial vertical sectional view showing a conventional linear motor elevator. DESCRIPTION OF SYMBOLS 1... Hoistway, 2... Main sheave, 2a... Auxiliary sheave, 3... Lobe, 4... Car, 5... Counterweight, 6.7... Guide rail, 8 ...Linear motor next side, 9...Linear motor next side, 10...Wiring, 11...Hit section.

Claims (1)

[Claims] The primary side of the linear motor is fixed to the wall of the hoistway, the secondary side of the linear motor is attached to the counterweight, and an auxiliary sheave is integrally attached to the upper end of the counterweight, and the end of the lobe on the counterweight side is moved up and down. A linear motor elevator, characterized in that the auxiliary sheave is fixed to a hitch part disposed at a road end and suspended between the hitch part and the sheave.