JPS59172367A - Drive for elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevator drive device that raises and lowers the entire car by winding up a marking holder that supports the car.

With the recent rise in land prices, residential land has become increasingly narrow and difficult to obtain. As a result, houses have increased in height from two to three stories, and there is a tendency for two generations to live together. In such houses, common areas such as kitchens and private rooms such as bedrooms are located on different floors, making it essential to have access between the first floors. This makes it difficult for elderly households to live there, and it also becomes troublesome to carry luggage into and out of the third floor. Therefore, it has been proposed to install elevators in such private residences.

There is a demand for a small and simple elevator.

Figure 1 shows the entire control system of a conventional elevator.

In the figure, (1) is a basket, f2m counterweight, (3
A suspension body consisting of a main rope connected to a 1μ car fi+ and a counterweight (2), (4) a hoisting machine around which this main rope (3) is wound, (5) a shaft (6) The electromagnetic coil (7a) constantly generates braking force by the electric motor connected to the hoisting member (4), (7) the lightning connected to the shaft (6), and the magnetic brake. , (7b), it is released and the control force disappears. R,S,
T is a three-phase AC power supply supplied to the electric motor (5), (11
a) and (11b) are ascending contactors with one end connected to the three-phase AC power supply R and S, respectively, and when closed, the electric motor (5) is fully energized and (1) the motor is fully raised. be.

(11c) is an ascending brake contact which is opened and closed in synchronization with the ascending contactors (11a) and (11b) to deenergize and energize the electromagnetic coil (7a).

(1h) and (12b) are connected to the three-phase AC power supplies R and S at one end, respectively, and the ascending contactor (1
A descending contactor is connected to the other ends of 1b) and 11a, and when opened, urges the electric motor (5) in a completely reverse rotation direction, causing the motor (1) to fully descend. (12c) is a descending brake contact which is opened and closed in synchronization with the descending contactors (12a) and (12b) to deenergize and energize the electromagnetic coil (7a).

(1 ki) and (13b) are controlled rectifier elements each consisting of a bidirectional thyristor, one end of which is connected to the other end of the ascending contactor (11a) and (1ib), (14a) (14
One end of b) and (14c) is connected to the other end of the bidirectional thyristor (13a), the other end of the two-way thyristor (1+b), and the three-phase AC power supply T, and the other end is connected to the electric motor (
The drive contactor connected to the electric motor (5) is used to turn on and off the AC power supply to the electric motor (5). (15a) and (15b) each have one end connected to the bidirectional cyrisk (13a).
) and a braking contactor connected to the other end of (13b),
Closed when the drive contactors (14a) to (14c) are open, and the drive contactors (14a) to (14c)
When it is closed, it is open. +
16+ is a rectifier circuit that full-wave rectifies the alternating current generated at the other end of each of the braking contactors (15a) and (15b) and supplies the full-wave rectified direct current to the all-DC electric motor (5).

In the elevator drive device configured as described above, during upward operation, the upward direction contactors (11a) (11b) and the drive contactors (14a) to (14c) are respectively closed, and the electric motor (5) is a bidirectional thyristor (13i) (
13b) All valves are connected to the three-phase AC power sources R, S, and T, and the upward brake contact (11c) is closed to release the electromagnetic brake (7). Bidirectional thyristor (
The gates of 13a) and 13b are gradually opened and the electric motor (
5) is accelerated and eventually fully opened, and (1) lL'
L Climb at a constant speed. Up to a certain distance before the destination floor (
1) rises, the drive contactors (14a) to (14c)
is opened, the braking contactors (15a) and (15b) are closed, and direct current is supplied to the motor (5) via the rectifier circuit αG, causing the motor (5) to generate braking torque. This braking torque is bidirectional sirisk (13a) (13b)
The car (1) is braked by the car (1) to smoothly decelerate.

When the car (1) rises to a fixed point, the ascending contactor (Ha
) (11b) and braking contactor (15a) (15b)
) are opened to de-energize the electric motor (5), and the brake contact (11c) is opened to cause the thunder 1 magnetic brake (7) to generate braking force and the 9 hoist (4) to fully valve. Cart (11) All held at fixed points.

Next, during descending operation, descending direction contactor (12a) (12b
) is closed to reverse the polarity of the motor (5) and connect it to the three-phase AC power supply R, S, , T, and the downward brake contact (12c) is closed to fully release the electromagnetic brake (7). do. Below, the force is controlled in the same way as during upward operation).
tl bζ is operated to a fixed point.

By the way, in the above-mentioned elevator drive system, the total weight of the first hoisting machine (4), the heel (1), and the counterweight (2) is fully supported, and the heel (1) is disposed at the top. Because I do.

Buildings must support the above total weight, as well as the weight of one hoist and electric motor, so the pillars become thicker.

Buildings become more expensive.

In addition, since the three-phase AC power supplies R, S, and Ti are connected to the electric motor (5) after switching the phase order between upward operation and downward operation, the upward direction contactors (11a) and (11b) are connected to the electric motor (5).
and descending direction contactors (12a) (12b).There was a drawback that ftt control was complicated because bt was required.

This invention was made in view of the above drawbacks.

An electric motor is connected to a hoisting machine that winds up a hoist that supports the car, and a three-phase AC power source that energizes the electric motor in the direction of raising the car is disconnected from one phase of this three-phase AC power source. By using a control means that selectively supplies the single-phase AC lightning source and the metal distribution motor to perform upward and downward operation, there is no need to switch the phase order of the power supply for upward and downward operation. The purpose is to provide a complete elevator drive system.

FIG. 2 shows an embodiment of the invention. In the figure, the same symbols as in Figure 1 indicate the same parts or stripes, and ■ is one box (1).
(21a) to (21a) to (21a) to (21a)-(
21c) has one end connected to the three-phase AC power supply R, s, T, respectively,
The other ends are bidirectional Sairisk (13a), (1
(25a) and (25b) are connected to the main contactor (21a), which is connected to the electric motor (5) and rotates the electric motor (5) fully in the direction of raising the car (1). This is a main contactor that operates alternatively to (21c) and supplies direct current to all DC motors (5) of the rectifier circuit ae. antl main contactors (21a) to (21c), (2
5a) and (25b). t2
6) is a brake contact that deenergizes and energizes the electromagnetic coil (7a), (22 to Q Shinko respectively indicate the 1st to 3rd floors serviced by the car (1)).

The operation of the elevator control system having the above structure will be described with reference to FIGS. 2 and 3.

Assume that the car (1) stops at the second floor and ascends to the third floor. Main contactors (21a) to (21c)
is closed and connected to three-phase AC power supplies R, S, and T, and the brake contact (21a) is also closed and the electromagnetic brake (7) is released. The bidirectional thyristor (13a) is fully conductive, and the bidirectional thyristor (13b) is initially non-conductive. At this time, since a single-phase AC power source consisting of AC power sources R and T is applied to the electric motor (5), the generated torque has a value shown by torque curve C31) in FIG. 3. As the bidirectional cylindrical risk (13b) is controlled and the conduction increases, the torque increases, and the bidirectional cylindrical risk (13b) increases.
13b) is fully conductive, as shown by torque curve 02. Therefore, the torque of the electric motor (5) changes over the range indicated by region A from the torque curve OB toward the torque curve I32. On the other hand, the load torque due to car (1) is the third
Assuming that the value corresponds to the torque curve (to) in the figure, the electric motor (5) will fully accelerate the car (1) with the torque shown in the above region A, and rotate at the intersection of the torque curve G3 and the torque curve (to). The car m'i is raised at a constant speed corresponding to the number n1.

When it rises to a predetermined distance in front of the third floor (24), the bidirectional thyristor (13a) is made non-conducting and the bidirectional thyristor (13b) is fully controlled, so that the torque of the electric motor (5) reaches the entire range shown in area B in Figure 3. Change.

Further, the bidirectional switch (13b) is made non-conductive, the main contactors (21a) to (21b) are opened, and the main contactor (2
5a) (25b) is closed 9, and then the two-way cylinder (13b) is controlled. When the firing angle is controlled, the torque changes within the range shown by the area E surrounded by the curve (2) in Figure 3, and any reduction is possible. The speed is obtained, and the car decelerates and arrives at the third floor C24). The main contactors (21a) to (21c) and the brake contact point are opened and the state is "C".

The brake (7) generates a braking force to completely stop the car (1).

Next, to describe the case where the car (Ilffi) is lowered from the 2nd floor (c) to the 1st floor oz, from the 2nd floor □□□ to the 3rd floor t2
4), the main contactors (21a) to (
21c) and the brake contact (21a) are opened. The bidirectional thyristor (13a) 1 is made non-conductive, and the bidirectional thyristor (15b) is controlled to supply the entire variable voltage of the single-phase AC power source to the motor (5). The electric motor (5) generates the entire torque within the range shown in FIG. 3C (region C) in accordance with the value of this variable voltage.

Then, when the bidirectional thyristor fi (t3b) is fully conductive, it generates a torque shown by the torque curve υ, which is the outer edge of the region C. The descending operation is accelerated not only by the weight of the heel (1) but also by the descending driving force of the electric motor (5) shown in the region C above. When the bidirectional thyristor (13b) is fully conductive, the car (1) descends at a constant speed corresponding to the rotational speed 05, which is the intersection of the torque curve C1υ and the torque curve C(3).

When it descends to a predetermined distance in front of the first floor, the bidirectional thyristor (1roa) (13b) becomes non-conductive and the main contactor (21
Open a) to (21c) and connect the main contactor (25 revision) (
25b) is closed to cause the induction motor (5) to generate the full DC braking torque shown in area F surrounded by curve G9 in FIG. 3 to decelerate the motor. Then two-way Sairisk (1,3b)
ffi non-conductor non-conductor main contactor (25a) (25b
)′? If you open the main contactor (25a) (25b)
There is no longer a power cut, and the lifespan is b? -It becomes longer.

As described above, this invention is an elevator drive device that uses an electric motor to drive a hoist that winds up a main rope holding four cars to raise and lower a car. A control rectifier element is fully connected to at least two phases of the phase AC power source to change the AC voltage, and the AC supplied from the AC power source is rectified by a rectifier circuit to generate a DC voltage.

A control means kf'? that selectively supplies three-phase alternating current and single-phase alternating current to the motor to perform all upward operation, and selectively supplies single-phase alternating current and direct current to the electric motor to perform downward operation. This has the effect that it is possible to provide a simple elevator that does not require switching means for completely switching the phase sequence of the AC power source.

[Brief explanation of drawings]

FIG. 1 is an electric circuit connection diagram showing a conventional elevator driving device, FIG. 2 is an electric circuit connection diagram showing an embodiment of the present invention, and FIG. 3 is an operation explanatory diagram.・In the figure, (1
) is the basket, (3) is the main rope, and (5) is the electric motor. (13a) and (13b) are control rectifier elements, 00 is a rectifier circuit, ■ is a control means for the hoisting machine 111, and R, S, and T are three-phase AC power sources. Note that the same cylinder number in Figure 9 indicates the same or equivalent parts. Agent Shin Kuzuno −

Claims (2)

[Claims] (1) A hoisting machine that raises and lowers the car by winding up the main rope carried by all the cars, an electric motor that drives this hoisting machine, a three-phase AC power source that rotates the electric motor in the direction of raising the heel, and A control rectifier connected to at least two phases of a phase AC power source to change the AC voltage, a rectifier circuit that rectifies the AC supplied from the AC power source and outputs DC, an AC voltage generated by the control rectifier and the rectifier circuit. An elevator driving device comprising control means for selectively supplying a direct current voltage to the electric motor to cause it to operate upwardly and downwardly. (2) The elevator driving device according to claim 1, wherein the rectifier circuit rectifies the alternating current generated by the control rectifier. (31 control means supplies the motor with a single phase obtained by disabling one of the control rectifying elements when the car is operated downward, and completely disconnects the single phase AC obtained when the car is descending.) 2. An elevator control system according to claim 1, wherein said electric motor is supplied with direct current from said rectifier circuit.