JPS646108B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevator control device, and more particularly to an elevator control device suitable for suppressing unpleasant vibrations from startup to acceleration.

FIG. 1 is a block diagram of a general elevator.
In Figure 1, 1 is a car, a counterweight, 3 is a rope, 4 is a deflection wheel, 5 is a sheave,
A car 1 and a counterweight are suspended from a sheave 5 via a deflection wheel 4 with a rope 3 in a hanging manner. 6 is a drive electric motor that drives the sheave 5; 7 is an electromagnetic brake; 8 is a variable power source for the electric motor 6; 9 is a speed control device that controls the electric motor 6; 10 is the electric motor 6
11 is a load detector provided in the car 1, and signals from the speed generator 10 and the load detector 11 are input to the speed control device 9 together with the speed command signal D. .

Next, the operation when the elevator starts will be explained with reference to FIG. The horizontal axis in Figure 2 is time, the vertical axis is speed, speed command, and torque, and A
is the torque curve of electromagnetic brake 7, B is car 1
C is the torque curve of the drive motor 6, D is the speed command, and E is the actual speed curve. Assume that at time T ₀ , a door closing command (not shown) is issued and the door begins to close. At the same time, unbalanced torque B
A load compensation torque is applied to the drive motor 6 in order to offset this and reduce the shock at startup. Then, at time _T1 , the safety switch (not shown) on the car side door and the lock switch (not shown) on the landing side door are closed, all other safety check circuits are formed, and the elevator is activated when the elevator is called to another floor. In order to respond, the coil of the electromagnetic brake 7 is energized and the time
At _T2 , the speed command D begins to be input to the speed control device 9, the motor torque C increases as shown in the figure, and the actual elevator speed E follows the speed command D with a slight delay. By the way, when the car 1 starts, the brake torque is attenuated, so it is likely to be pulled by an unbalanced load, but the electric motor 6
Since an unbalanced torque is generated in the engine, even if it is actually started from an unbalanced load state, it starts smoothly as if it had started from a balanced load state. In this way, the so-called starting compensation that generates unbalanced torque in the electric motor 6 before starting,
This is commonly done in DC elevators.
It's working.

However, this load compensation also has the following problems. In other words, the load compensation command may be incorrect. Causes of the load compensation command being out of order include nonlinearity of the detector, deterioration over time, insufficient number of detectors, and differences in the stopping position of the car 1 in the case of high lift. Countermeasures against these problems include using a high-precision load detector, increasing the number of detectors, and correcting the car stop position signal according to the stop position, but this would result in an increase in equipment costs. .

On the other hand, the starting shock is not so much of a problem if the elevator has a low lift, if the vibration damping rate of the rope 3 is high, or if a speed control device 9 with a strong vibration suppression force is used. In the case of an elevator that does not meet all of the above conditions, sustained vibrations F as shown in FIG. 3 may occur. FIG. 3 shows not only the starting shock but also the case where this shock resonates with the natural frequency of the rope 3 and continues without damping. As described above, in modern high-height buildings, if load compensation is not performed completely, a problem arises in that sustained vibrations are generated due to the starting shock.

The present invention has been made in view of the above, and its purpose is to provide an elevator control device that can prevent the impact from sustaining during acceleration even if starting compensation is incomplete. It's about doing. This problem can be solved by reducing the brake torque to zero and allowing the car to be suspended only by the compensation torque of the electric motor for a while. This is because the special vibration caused by the starting shock is reduced.

One method for achieving this purpose is to drive the elevator by applying a compensation torque that compensates for the unbalanced torque that occurs between the car and the counterweight according to the output of the load detector during the closing operation of the car door. The present invention is characterized in that a control means is provided to generate a speed command to the electric motor, release the brake device that restrains the drive motor after a minute delay, and issue a speed command to the electric motor after a predetermined time has elapsed from the time when the brake device is released. be. The present invention will be described in detail below with reference to the embodiment shown in FIG. 4 and FIG. 5.

FIG. 4 is a circuit diagram showing an embodiment of the device of the present invention. In Fig. 4, P and N are the power supply, GS is the gate switch, 45A is the normally open contact of the call registration relay (not shown), 100 is the normally open contact of the departure preparation relay (not shown), and 40M is the excitation relay of the door lock magnet. , 40M _a is its normally open contact, 4
0 is a hatch door lock check relay, _40a is its normally open contact, 50B is a normally open contact of a safety-related check relay (not shown), 17B is a starting compensation generation relay, 17B _a is its normally open contact, 17B _b is its normally closed contact, TI is a timer that measures the time until starting compensation is established, TI _b is its normally closed contact, 15B is the relay for the magnetic brake, 61
A and 62B are normally open contacts of driving direction relays (not shown), and 111 and 112 are driving command relays, which are connected as shown.

Next, the operation will be explained with reference to FIG. When the contact 45A of the call registration relay and the contact 100 of the departure preparation relay are closed, and the contact 50B of the safety check relay is closed, the start compensation generation relay 17B turns on at time _T0 , and the start compensation starts operating. , a compensation torque C is generated in the electric motor 6. Further, the door closing operation starts from time _T0 . When a predetermined period of time has elapsed after start-up compensation has started, the timer TI turns off and its contact TI _b closes, so the magnetic brake relay 15B turns on and the electromagnetic brake 7 is released from time _T4 . . However, the car 1 is maintained at a zero speed level by the starting compensation torque of the electric motor 1 and the zero speed command. At this time, if the starting compensation torque command is not optimal, a shock may occur as shown in G in Figure 5C, but since the speed command is a zero command, this vibration rarely persists. . That is, this vibration disappears by releasing the brake and allowing the car to be pushed only by the compensation torque of the electric motor for a while. Also, at this time, the door is being closed, so passengers do not feel the shock much. When the door closing operation progresses and the gate switch GS closes at time _T1 , P-GS-45A-100-
The excitation relay 40M of the door lock magnet is turned on in the 40M-N circuit, and the hatch door is locked. Also, since the contact 40M _a of the relay 40M is closed, the hatch door lock check relay 40 is turned on, and its contact 40 _a is closed, so that at time T ₂
The driving command relay 111 or 112 is turned on depending on the driving direction, and the speed paper command D is input to the speed control device 9. Therefore, as shown in FIG. 5a, the actual speed E changes from the time _T3 to the speed command D.
will start up a little later. At this time _T3 , the car 1 is already in a balanced state with the compensation torque of the electric motor 6 and the speed of zero (the electromagnetic brake 7
is about to be released. ), as if the elevator were started from a balanced load state, the increase in acceleration F becomes smooth, as shown in FIG. 5c, and no sustained vibration occurs due to startup.

Continuous vibrations during acceleration associated with elevator startup appear more frequently as the lift is higher and as the load becomes heavier. In this case, it is preferable to do as in the embodiment of the present invention described above, in which case the effect is remarkable. In addition, according to the above-mentioned embodiment, the release timing of the electromagnetic brake 7 is slightly earlier than that of the conventional system, so the power consumption increases, but the power consumption is very small at about 300 WS per operation. If the electromagnetic brake 7 is controlled to be opened early only under the above-mentioned conditions, it is possible to avoid problems in terms of energy saving.

As explained above, according to the present invention, even if the startup compensation of the elevator is incomplete, it is possible to prevent the impact caused by it from sustaining during acceleration, thereby making it possible to provide an elevator with a comfortable ride. There is an effect that it can be done.

[Brief explanation of drawings]

Figure 1 is a diagram of the configuration of a general elevator, Figure 2 is a diagram showing the temporal relationship between various torques, speeds, and speed commands, Figure 3 is a diagram to explain sustained vibration, and Figure 4 is a diagram showing the temporal relationship between various torques, speeds, and speed commands. FIG. 5 is a relay circuit diagram showing one embodiment of the elevator control device of the present invention, and is a diagram for explaining the effects of the present invention. 1... Car, 2... Counterweight, 3... Rope, 6... Drive electric motor, 7... Electromagnetic brake, 9...
Speed control device, 40M...Door lock magnet excitation relay, 40...Hatch door lock check relay, 17B...Start compensation generation relay, TI...Timer,
15B...Magnetic brake relay, 111,
112...Operation command relay.

Claims (1)

[Claims] 1. A brake device that restrains an elevator drive motor, a load detector that detects a load on a car,
a control device that controls the torque of the drive motor according to the output of the load detector, and balances the car according to the output of the load detector after the closing operation of the door of the car starts. In an elevator control device that controls the drive motor to generate a compensation torque that compensates for an unbalanced torque generated between the weight and the weight, the brake device is released after the compensation torque is generated, and a predetermined period of time has elapsed since then. A control device for an elevator, further comprising a control means for later sending a speed command to the drive motor. 2. When the car is located on the lower floor,
2. The elevator control device according to claim 1, wherein said control means is configured to operate. 3. The elevator control device according to claim 1, wherein the control means is configured to operate when the load in the car is heavy.