JPS6364380B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevator drive device that raises and lowers a car by winding up a suspension body 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 trend 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, and inter-floor communication is essential. 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, and there is a demand for small and simple elevators.

Figure 1 shows a conventional elevator control device,
In the figure, 1 is a car, 2 is a counterweight, 3 is a suspension body consisting of a main rope connected to the car 1 and the counterweight 2, respectively, 4 is a hoist around which the main rope 3 is wound, and 5 is a hoist. An electric motor is coupled to the hoisting machine 4 via a shaft 6, and 7 is an electromagnetic brake coupled to the shaft 6, which constantly generates braking force.
When energized by the DC power source 7b, it is opened and the control force is reduced. R, S, and T are three-phase AC power supplies that are supplied to the electric motor 5, and 11a and 11b are ascending contactors that have one end connected to the three-phase AC power supplies R and S, respectively, and when closed, the electric motor 5 is connected. This is to force car 1 to rise. 11c is a rising brake contact which is opened and closed in synchronization with the rising contactors 11a and 11b to de-energize and energize the electromagnetic coil 7a; 12a and 12b have one end connected to the three-phase AC power supply R and S, and the other A descending contactor has one end connected to the other end of the ascending contactor 11b and 11a, and when opened, urges the electric motor 5 in the reverse rotation direction to lower the car 1. 1
2c is a descending brake contact that is opened and closed in synchronization with the descending contactors 12a and 12b to de-energize and energize the electromagnetic coil 7a; one end of 13a and 13b is connected to the other end of the ascending contactor 11a and 11b, respectively. A controlled rectifying element consisting of a bidirectional thyristor,
14a, 14b and 14c each have one end connected to the bidirectional thyristor 13a and the other end connected to the thyristor 13 on both sides.
A drive contactor connected to the other end of b and the three-phase AC power supply T, and the other end connected to the electric motor 5, respectively,
This is to turn on and off the AC power supply to the electric motor 5. Braking contactors 15a and 15b have one end connected to the other end of the bidirectional thyristors 13a and 13b, and are closed when the drive contactors 14a to 14c are open, and are closed when the drive contactors 14a to 14c are open.
When a to 14c are closed, they are open. 16 are braking contactors 15a and 1
This is a rectifier circuit that full-wave rectifies the alternating current generated at the other end of each of the coils 5b and supplies direct current to the motor 5.

In the elevator drive device configured as described above, during ascending operation, the ascending contactor 11a,
11b and drive contactors 14a to 14c are respectively closed, and the electric motor 5 is connected to the bidirectional thyristor 13.
It is connected to three-phase AC power supplies R, S, and T via a and 13b, and the upward brake contact 11c is closed and the electromagnetic brake 7 is released. The gates of the bidirectional thyristors 13a and 13b are gradually opened to accelerate the electric motor 5, and when they are finally fully opened, the car 1 rises at a constant speed. When the car 1 rises to a predetermined distance before the destination floor, the drive contactors 14a to 14
c is opened, the braking contactors 15a and 15b are closed, and direct current is supplied to the motor 5 via the rectifier circuit 16, causing the motor 5 to generate braking torque.
This braking torque is generated by the bidirectional thyristors 13a, 13
b, and the car 1 is smoothly decelerated. When the car 1 rises to a fixed point, the ascending contactors 11a, 11b and the operating contactors 15a, 15b
are respectively opened and the electric motor 5 is deenergized, and the brake contact 11c is opened and the electromagnetic brake 7 generates a braking force to hold the car 1 at a fixed point via the hoisting machine 4.

Next, during descending operation, descending direction contactors 12a, 12
b is closed to reverse the polarity of the electric motor 5 and connect it to the three-phase AC power source R, S, T, and the downward brake contact 12c is closed to release the electromagnetic brake 7. Thereafter, the car 1 is operated to a fixed point under the same control as in the upward operation.

By the way, in the above-mentioned elevator drive device, the hoisting machine 4 is disposed above the car 1 to support the total weight of the car 1 and the counterweight 2, so the building supports the total weight and the hoisting machine 4. The weight of the upper machine and the electric motor must also be supported, making the pillars thicker and the building more expensive.

In addition, since the three-phase AC power supplies R, S, and T are connected to the motor 5 with the phase order switched between the ascending direction operation and the descending direction operation, the ascending direction contactors 11a and 1 are connected to the electric motor 5, respectively.
1b and downward direction contactors 12a, 12b are required, which has the disadvantage of complicating control.

This invention was made in view of the above-mentioned drawbacks, and includes a three-phase AC power source that connects an electric motor to a hoisting machine that winds up a hoist that supports a car, and energizes the electric motor in a direction to raise the car; By selectively supplying the single-phase AC power obtained by discontinuing one phase of the three-phase AC power to the electric motor for upward and downward operation, the phase of the power supply is controlled in upward and downward operation. It is an object of the present invention to provide a simple elevator drive device that does not require changing the order.

FIG. 2 shows an embodiment of the invention. In the figure, the same reference numerals as in Figure 1 indicate the same or corresponding parts, and 20
A winding drum-type hoist that lifts and lowers the cage 1 by winding up a suspension body 3 consisting of a main rope that suspends the cage 1, 21
One end of a to 21c is a bidirectional thyristor 13a, 1
3b and one phase T of the three-phase AC power supply, the other end is connected to the electric motor 5, and the main contactor 25 is connected to rotate the electric motor 5 in the direction of raising the car 1.
Reference numerals a and 25b are main contactors that operate alternatively to the main contactors 21a to 21c to supply direct current from the rectifier circuit 16 to the motor 5. 21 is the main contactor 21a~
The control means consists of 21c, 25a, and 25b. Reference numeral 26 indicates a brake contact for deenergizing and energizing the electromagnetic coil 7a, and 22 to 24 indicate the first to third floors serviced by the car 1, respectively.

The operation of the elevator control device with the above configuration is
This will be described based on the diagram and FIG.

First, it is assumed that the car 1 stops at the second floor 23 and ascends to the third floor 24. Main contactors 21a to 21c
is closed and connected to the three-phase AC power supplies R, S, and T, and the brake contact 21d is also closed and the electromagnetic brake 7 is released. The bidirectional thyristor 13a is fully conductive, and the bidirectional thyristor 13b
is initially in a non-conducting state. 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 a torque curve 31 in FIG. 3. Bidirectional thyristor 13b
As the conduction is increased by controlling the torque, the torque increases, and when the bidirectional thyristor 13b is fully conductive, it becomes as shown by the torque curve 32. Therefore, the torque of the electric motor 5 changes within the range indicated by region A from the torque curve 31 to the torque curve 32. On the other hand, if the load torque by the car 1 is a value corresponding to the torque curve 33 in FIG. Car 1 is raised at a constant speed corresponding to the number of revolutions n ₁ of .

When the vehicle rises to a predetermined distance in front of the third floor 24, the bidirectional thyristor 13a is made non-conductive, and the bidirectional thyristor 13b is controlled to reduce the torque of the electric motor 5 to the third floor.
The range indicated by region B in the figure is changed.

Further, the bidirectional thyristor 13b is made non-conductive, the main contactors 21a to 21b are opened, and the main contactor 25
a, 25b are closed, and then both thyristors 1
When the firing angle of 3b is controlled, the torque becomes curve 3 in Figure 3.
The deceleration speed changes within the range shown by the region E surrounded by 4, and an arbitrary deceleration can be obtained, and the car decelerates and arrives at the third floor 24. The main contactors 21a to 21c and the brake contacts 26 are opened, and the brake 7 generates a braking force to stop the car 1.

Next, to describe the case where the car 1 is lowered from the second floor 23 to the first floor 22, from the second floor 23 to the third floor 2
4, the main contactors 21a to 2
1c and brake contact 21d are opened. The bidirectional thyristor 13a is made non-conductive, and the bidirectional thyristor 13b is controlled to supply variable voltage of the single-phase AC power source to the motor 5. The electric motor 5 generates a torque within a range indicated by region C in FIG. 3 in accordance with the value of this variable voltage. When the bidirectional thyristor (13b) is fully conductive, it generates a torque shown by a torque curve 31, which is the outer edge of region C. The descending operation is accelerated not only by the weight of the car 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 rotation speed _n3 , which is the intersection of the torque curve 31 and the torque curve 33.

When descending to a predetermined distance in front of the first floor 22, the bidirectional thyristors 13a and 13b are made non-conductive, the main contactors 21a to 21c are opened, and the main contactors 25a and 25a are turned off.
25b is closed to cause the induction motor 5 to generate a DC braking torque shown in a region F surrounded by a curve 35 in FIG. 3 to decelerate the motor. Then bidirectional thyristor 1
After making 3b conductive, the main contactors 25a and 25b
If the main contactors 25a and 25b are opened, the power supply will not be cut off, and the lifespan of the main contactors 25a and 25b will be extended.

As described above, the present invention provides an elevator drive device for raising and lowering a car by driving, with an electric motor, a hoist that generates a load torque in the direction of winding and constantly rewinding one end of the main rope that suspends the car. Upward operation is performed by supplying three-phase AC power to the motor to generate drive torque and winding up the main rope against the load torque, and downward operation is performed by disconnecting the control rectifier connected to the three-phase AC power. This is done by applying the single-phase AC power obtained by making it conductive to the motor, and rewinding the main rope in conjunction with the above load torque, and as necessary when approaching the destination floor during both ascending and descending operations. The motor is designed to apply direct current to the electric motor to generate braking torque.

Therefore, there is no need for a means for switching the phase sequence of the AC power supply, and the elevator has the effect that it can be made into a simple elevator.

[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 a car, 3 is a main rope, 5 is an electric motor, 13a, 13b are control rectifiers, 16 is a rectifier circuit, 20 is a hoisting machine, 21 is a control means, R, S,
T is a three-phase AC power supply. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A main rope that suspends the car, a hoist that winds and unwinds one end of the main rope to raise and lower the car, an electric motor that drives the hoist, and a motor that rotates the electric motor in the direction that raises the car. phase AC power supply,
a control rectifier connected to the three-phase AC power supply to change the AC voltage; a rectifier circuit that rectifies the AC supplied from the AC power supply and outputs DC to generate braking torque for the motor; The three-phase alternating current and the direct current are selectively supplied to operate the cage upwardly, and the control rectifying element is made non-conductive without changing the phase order of the alternating current power source, thereby cutting out one phase. An elevator drive device comprising a control means for driving the car downward by selectively supplying a single-phase alternating current obtained from a power source and the direct current.