JPS6052068B2 - elevator control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a control device for a DC elevator.

In the Ward Leonard method, in which the voltage supplied to a DC motor for driving an elevator is adjusted by a motor generator to control the rotational speed of the DC motor, the field voltage of the motor generator is generally controlled by a field control device. It is being done.

As a means for configuring such a field control device at low cost, as shown in FIG.
21, and switching the output polarity of the field control device using relay contacts according to the running direction of the car. Now, in an elevator, the load inside the car is generally measured by a load detection device, and if the load exceeds the rated load, the car is usually prevented from running.

On the other hand, when the car is stopped on the floor, if the car deviates from the landing level (planned landing/error range) due to changes in the number of passengers, the car will restart and return to the landing level again. Driven to enter.

This is called a re-flooring operation. This re-flooring operation requires consideration of a considerable overload (approximately 150% of the rated load), but as is well known, elevators use counterweights that are approximately half of the rated load, so they support the load. Therefore, the output required by the field control device is approximately twice as much on the overload side as on the no-load side. Now, if we consider the case where the car moves above the floor, it is set to descending operation, and the output of the field control device is as shown in Figure 1, where the positive direction is the descending side and the negative direction is the ascending side, and its saturation level is high on the falling side and low on the rising side. Therefore, if the output of the field control device when the car is overloaded is point A in FIG. 2, it will be point B when there is no load.
On the other hand, when the car moves to the bottom of the floor, it is set to ascending operation, so the positive direction of the output of the field control device in Figure 1 is the ascending side, and the negative direction is the descending side, and the saturation level is The rising side is high and the falling side is low. Therefore, when the car is overloaded, the output is at point C, and when there is no load, the output is at point D. Conventionally, the negative saturation level V2 of the field control device had to be higher than point A in Figure 2 in preparation for the re-balancing operation in the event of an overload, so it was sufficient compared to the positive saturation level ■1. The value cannot be reduced to a small value, which is a factor in making the field control device expensive. In addition, there was a risk that an overload greater than expected would result in a situation where re-flooring would not be possible. This invention solves the above-mentioned drawbacks, and uses a field control device that generates positive and negative outputs with different saturation levels and outputs by switching the positive and negative polarities depending on the running direction. When the generated torque is insufficient when controlling the electric motor, it is compensated for by increasing the self-excitation ratio, etc., making it possible to reduce the output at a small saturation level, making it possible to use a cheaper field control device. Another object of the present invention is to provide an elevator control device that can reliably re-align the floor even in the event of a more than expected overload.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In the figure, 1 is a speed command device that commands the running speed of the elevator, 2 is a landing device that commands the landing speed of the elevator,
A voltage ■ proportional to the distance X from the floor of the car is generated.

3 is an adder, 4 is a field control device having the characteristics shown in Fig. 1, 5 is an armature of a DC generator, 6 is a separately excited field magnet,
7 is also a self-exciting field, 8 is a resistor that adjusts the current of the self-exciting field 7, 9 is an armature of a DC motor, 10 is a speedometer generator, 11 is a sheave, 12 is a main rope, 13 is a elevator car,
14 is an in-car load detection device provided in the car 13, 1
4a is a normally open contact, which closes when the load of the car 13 exceeds the rating; 15 is a counterweight; 16 and 17 are landing position detection switches installed at the elevation;
18 is a cam attached to the car 13 and operates the switches 16 and 17; 19 is a floor;
20a is a running relay contact 2 that closes while the car 13 is running;
0b and 20c are running relay contacts 121a that also open.
~21f is a relay contact for ascending operation that closes during ascending operation,
Similarly, 22a to 22f are relay contacts for descending operation.

Next, the operation of this embodiment will be explained. When the car 13 is in upward operation, the travel relay contact 20a is closed and the speed command device 1 is connected to the adder 3.

In addition, the relay contacts 21a to 21f for ascending operation are closed, and the landing device 2, the field control device 4, and the speedometer generator 10 are closed.
The polarity of is set to the upward operation side. The control system now constitutes a closed loop, and the output of the speed command device 1 and the output of the speedometer generator 10 are added by the adder 3, and this added signal is amplified by the field control device 4 to separately excite the generator. The field 6 is excited. As a result, a voltage is induced in the generator armature 5, the motor armature 9 rotates, and the car 13 runs according to the command from the speed command device 1. When the car 13 reaches a predetermined distance before the floor of the desired stop floor, the running relay contact 20a opens and the contact 20b closes. As a result, the landing device 2 is connected to the adder 3, and the car 13 lands on the floor according to the instructions from the landing device 2. When the car 13 is operated in a descending manner, it is the same as in the case in which it is in an ascending operation, except that the descending operation relay contacts 22a to 22f are closed. Furthermore, as shown in Fig. 3, in order to promote the excitation of the generator's separately excited field 6 and reduce the excitation capacity of the separately excited field 6, a self-excited field 7 is generally used in conjunction with the generator. The self-excitation ratio is adjusted using resistor 8.

When the car 13 is running, the running relay contact 2
Since 0c is open, the self-excitation field 7 is excited at a self-excitation ratio determined by the total resistance value of the resistor 8. Next, the bed re-alignment operation will be explained.

When the car 13 is stopped on the floor 19, if the car 13 deviates from the landing level due to a change in the number of passengers, etc., the car 13 performs floor alignment again. Now, assuming that the car 13 is moved upward, the cam 18 engages with the switch 16, and the relay contacts 22a to 22f for downward operation are closed. Since the running relay contact 20b is closed during re-floor alignment, the landing device 2 is connected to the adder 3. As a result, the control system forms a closed loop, and the car 13 re-aligns the floor according to the command from the landing device 2. When the car 13 lands on the floor 19, the cam 18 and the switch 16
is disengaged, contacts 22a to 22f are opened, and the re-alignment operation is completed. When the car 13 moves downward, the process is the same as when the car 13 moves upward, except that the cam 18 engages the switch 17 and the relay contacts 21a to 22f for upward operation are closed. Now, regarding re-floor alignment when the load in the car is below the rating, the load detection device 14
does not operate and contact 14a is open, so resistor 8
Re-leveling is performed at the self-excitation ratio determined by the total resistance value of.

However, in the case of re-flooring when the car is overloaded, the load detection device 14 operates and the contact 14a is closed, and the travel relay contact 20c is in the closed state. Therefore, when the car 13 moves upward, the cam 18 and switch 1
6 is engaged and contact 16a is closed, so 20c-16
A part of the resistor 8 is short-circuited using the circuit a-14a. As a result, the self-excitation ratio increases and the amplification degree of the generator increases, so
The output required by the field control device 4 to support the overload is as shown at point A'' in FIG. The switch 17 is engaged and the contact 17a is closed, thereby shorting out a portion of the resistor 8 in the circuit 20c-17a-14a. The output becomes as shown at point C'' in FIG. 2, which may be smaller than the conventional point C. In this way, the output required for the field control device 4 to support overload is reduced, and an inexpensive field control device 4 with a low negative direction saturation level V2 can be used, and it is possible to reliably handle overloads greater than expected. It becomes possible to re-align the floor. FIG. 4 shows another embodiment of the present invention, in which reference numeral 91 indicates the field of the DC motor;
92 is a resistor for adjusting the current of the field 91, 93 is an excitation power source, and the rest is the same as in FIG. 3.

In this embodiment, in the case of overload re-balancing, the current flowing through the field 91 of the DC motor is increased.

As is well known, the torque generated by a DC motor is proportional to the field current, so in this way the output required by the armature 5 of the DC generator to support the load is reduced, and along with this, field control The power required by the device 4 is also reduced to provide the same functionality as in FIG. It is obvious that the output required by the field control device 4 can be further reduced if used in combination with the above-described configuration that increases the self-excitation ratio of the generator during overload re-balancing.

As explained above, in this invention, positive and negative outputs with different saturation levels are generated, and the output operation is performed by switching the positive and negative polarities depending on the running direction.When controlling the electric motor based on the small saturation level, the generated torque is insufficient. In other words, when re-balancing under overload conditions, the self-excitation ratio of the DC motor is increased, or the externally excited field current of the DC motor is increased, which reduces the need for a small field control device. The saturation level output can be lowered by a lower layer,
Therefore, it is possible to use an inexpensive field control device, and
It is possible to reliably re-align the floors even in the event of an overload that exceeds expectations.

[Brief explanation of drawings]

FIG. 1 is an input/output characteristic diagram of an elevator field control device, FIG. 2 is a diagram showing operating points of the field control device during re-floor alignment, and FIG. 3 is a circuit diagram showing an embodiment of the elevator control device according to the present invention. FIG. 4 is a circuit diagram showing another embodiment of the elevator control system according to the present invention, and is a partial diagram of FIG. 3. DESCRIPTION OF SYMBOLS 1... Speed command device, 2... Landing device, 3... Adder, 4... Field control device, 5...
...DC generator armature, 6...DC generator other excitation field, 7...DC. Generator self-excited field, 8
...Resistance, 9...DC motor armature,
10... Speedometer generator, 11... Sheave, 12... Main rope, 13... Car, 14
... Load detection device, 15 ... Counterweight, 16, 17 ... Landing position detection switch, 18
...Cam, 19...No...Floor, 20a, 2
0b, 20c... Travel relay contact, 21a-2
1f...Relay contact for upward operation, 22a to 21
f...Relay contact for descending operation.

Claims (1)

[Scope of Claims] 1. A DC motor for driving a car, a DC generator having a separately excited field and a self-excited field and supplying DC power to the DC motor, and controlling the self-excited field of the DC generator. Self-excited field control device,
A landing device that issues a landing speed command to stop the above-mentioned car within the landing error range, operates according to the above-mentioned landing speed command, and has positive and negative polarity with a high positive saturation level and a small negative saturation level. A separately excited field control device that outputs an output and switches its polarity depending on the running direction of the car, and controls the separately excited field of the DC generator based on this output, when the load of the car exceeds a predetermined value. A load detection device that operates when the car reaches the floor, and if the load detection device is operating when the car is out of the landing error range of the floor on which it is landing, it controls the self-excitation field control device and starts the DC power generation. An elevator control device comprising an adjustment circuit that increases the self-excitation ratio of the machine. 2. A DC motor for driving a car having a separately excited field, a separately excited field control device that controls the separately excited field of the DC motor, a DC generator that supplies DC power to the DC motor, and a DC motor that drives the car within a landing error range. A landing device that issues a landing speed command to stop the car, which operates according to the landing speed command, emits an output with positive and negative polarity, with a large positive saturation level and a small negative saturation level, and also outputs an output with positive and negative polarity, and also controls the direction of car travel. a field control device that switches the polarity and outputs the output according to the output, and controls the field of the DC generator based on this output; a load detection device that operates when the load of the car exceeds a predetermined value; If the load detection device is operating when the landing error range of the floor on which the floor is being landed is outside the landing error range, an adjustment circuit is configured to control the separately excited field control device to increase the separately excited field current of the DC motor. Elevator control equipment.