JPS6351948B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an elevator speed control device,
In particular, the present invention relates to a device suitable for performing landing control.

[Conventional technology]

FIG. 1 is a system diagram showing an example of an elevator speed control device having a feedback circuit.

In Figure 1, 1 is an elevator car, 2
A counterweight, 3 a hoisting rope connecting the car 1 and the counterweight 2, 4 a net wheel around which the hoist rope 3 is wound, 5 an armature of the electric motor that drives the net wheel 4, and 6 a hoisting rope of the electric motor. Field coil, 7
8a and 8b are power converters that supply electric power to the armature 5 according to the output 18a,
For example, a converter device or a motor generator uses a thyristor to supply DC power from an AC power supply 9, 10 is a current detector that detects the current flowing through the armature 5 and generates a corresponding current signal 10a, and 11 is a speed A speed command generator that issues a command value 11a, 1
2 is provided in the car 1, and the speed command value 12 is set at the time of landing on the floor.
13 is a guide plate provided for each floor; 14 is a switching device for switching the speed command system between the speed command generation device 11 and the landing device 12; 1;
5 is the armature 5 in response to the command from the speed command system mentioned above.
16 is a speed amplifier that issues a current command value 16a based on the above-mentioned output from the calculation device 15; 17 is a current flowing through the armature 5; 19 is an arithmetic unit that calculates the amount of compensation for the voltage drop caused by the current signal 10a; 19 is the armature 5;
This is an electromagnetic braking device that restrains and holds the vehicle stopped.

FIG. 2 is a circuit diagram showing a specific example of the landing device 12, which includes a pair of coils excited by an AC power source 120 and position detection coils arranged opposite to the coils. 121 and 122
Rectifiers 123 and 124 are connected to the position detection coils 121 and 122, respectively, and the (+) sides of these rectifiers 123 and 124 are connected to the resistor 12.
5, and the (-) side is connected by the guide plate 1.
3 is at the intermediate position between the position detection coils 121 and 122, that is, when the car 1 is at the normal landing position, the potential difference occurring in the resistor 125 is balanced and cancelled, and the speed command value 12a at the time of landing is zero, and when the guiding plate 13 is not stopped at the normal landing position, that is, when the guiding plate 13 is not at the intermediate position between the position detection coils 121 and 122, the intermediate position between the resistors 125 is set so that an unbalanced potential difference occurs in the resistors 125. It has a configuration in which the points are connected. 126 is a gain adjustment resistor.

FIG. 3 is a position-speed command characteristic diagram when the car lands on the floor, showing the relative relationship between the position detection coils 121 and 122, the output voltage of the speed command value 12a at the time of landing on the floor, and the induction plate 13. , V ₁₂₁ is the output voltage output from the position detection coil 121 via the rectifier 123, V ₁₂₂ is the output voltage output from the position detection coil 122 via the rectifier 124, and V _{12a is the output voltage output from the position detection coil 122 via the rectifier 124} . The respective output voltage V ₁₂₁ and
V ₁₂₂ is the output voltage of the synthesized speed command value 12a. Now, when the car 1 responds to a call for a certain floor, the switching device 14 switches the contact point to the a side, and the car runs according to the speed command value 11a from the speed command generator 11, and when it arrives at this floor. The switching device 14 switches the contact point to the b side and moves the car 1 based on the speed command value 12a from the landing device 12, that is, the characteristics shown in FIG. 3 12a, so that the landing error becomes zero. Implantation control is being performed to stop it.

[Problem to be solved by the invention]

By the way, the above-mentioned elevator speed control device has a phenomenon in which the response of the drive system to a command is delayed, and the current situation is that a quick response control system has not yet been realized.

Therefore, even if a command is issued to stop the car at the normal landing position, the car 1 may go too far depending on the conditions, and the conventional landing device 12 moves the car 1 in the opposite direction to compensate for this. At this time, when a command to move is issued and the car 1 is moved, if the car 1 goes too far past the normal landing position due to the above phenomenon, this operation will be repeated. On the other hand, the elevator control operates the electromagnetic braking device 19 to restrain the armature 5 and move the car 1 after a certain period of time has elapsed after arriving at the landing floor, that is, approximately 3 seconds in general. I'm trying to stop it.

Therefore, in the conventional elevator speed control device configured as described above, there is a problem that the car 1 cannot be stopped at the normal landing position.

Therefore, the present invention has been made to solve the above-mentioned problems, and its purpose is to prevent the landing position of the car from changing significantly due to delays in the control system, and to An object of the present invention is to provide a speed control device for an elevator that allows the elevator to land at a substantially constant position.

[Means to solve the problem]

A feature of the present invention is that when a car driven by an electric motor lands on the floor, the car is caused to travel according to the relative position of the floor on which the car should land and a set regular landing position. A speed control device for an elevator is provided with a landing device that issues a speed command value, and an electric motor is driven based on the speed command value from the landing device to control the landing of a car. The present invention is characterized in that the car is provided with means for switching the running polarity of the speed command value at a predetermined fixed position before the normal landing position of the car.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIGS. 4 and 5.

FIG. 4 shows a landing device 12 corresponding to FIG. 2 according to the present invention, and the same reference numerals as in FIG. 2 indicate the same parts.

In FIG. 4, one of the position detection coils 121 and the rectifier 123 is connected through a resistor 127, and the normally open contact 10MU of the relay, which is energized during precision landing speed operation during ascending operation, During speed operation, the resistor 127 is connected so as to be short-circuited, and one of the position detection coils 122 and the rectifier 124 is connected in the same manner as above with a resistor 128 having the same resistance value as the resistor 127. ,
The normally open contact 10MD of the relay, which is energized during the precision landing speed operation during the descending operation, is connected so that the resistor 128 is short-circuited during the precision landing speed operation, and the rest is as follows. It has a connected configuration similar to that shown in FIG.

FIG. 5 shows the position-speed command characteristics when the car lands on the floor shown in FIG. 3 and the position-speed command characteristics when the car lands on the floor during the ascending operation of the landing device 12 shown in FIG. FIG.

In FIG. 5, the same symbols as in FIG. 3 indicate output voltages corresponding to those in FIG. 3 from the rectifiers 123 and 124 outputted through resistors 127 and 128, respectively, and V ₁₂₁ ' is the output voltage during rising operation. Normally open contact 10MU of precision landing speed operation relay energized at
is the output voltage output from the rectifier 123 when the resistor 127 is closed and the resistor 127 is short-circuited, and V _12a ′
shows the output voltage 2a, which is the speed command value outputted from the landing device 12 in FIG. 4 by combining the output voltages V ₁₂₁ ′ and V ₁₂₂ .

Now, for example, when car 1 enters the floor landing operation control area during ascending operation and precision landing speed operation is performed, the precise landing speed operation relay during ascending operation is energized, and its normally open contact is activated. When the MU 10 is closed and the guide plate 13 is inserted between the above pair of coils and the position detection coils 121 and 122, the resistor 127 is precisely connected to the landing device 12 shown in FIG. Normally open contact 10 of landing speed operation relay
The MU short-circuits and outputs the speed command value 12a indicated by V _12a ′, and the landing device 1
2 is point A when the car 1 reaches the normal landing position point O, and the speed command value 12a becomes zero,
A speed command for reversing the car 1 is output from the point. If the speed control system of the elevator is an ideal control system with no delay in the drive system in response to the command, the rotation of the armature 5 will be stopped in response to the command, leaving the car 1 at a distance of A-O. Although it is stopped,
As mentioned above, in the elevator control system, there is a delay in the drive system relative to the command, so the armature 5a rotation speed actually reaches zero after a predetermined period of time has passed after the speed command value 12a becomes zero. Therefore, car 1 is stopped. That is, when the car passes point A and reaches point B, the car 1 stops. If you adjust the distance between A and B to the delay of the control system and set point B to point O, which is the normal landing position,
Since the command to reverse the car 1 is issued from the point, a braking force is applied to the traveling inertia force, and the car does not go too far past the normal landing position, the O point. Car 1 is always almost O
It can be stopped at a point.

That is, in this embodiment of the present invention, at the floor where the car 1 is stopped, the delay time of the drive system in response to the command to the landing device 12 that causes the car 1 to operate at a precise landing speed is adjusted. The speed command value 12a becomes zero before reaching the normal landing position that corresponds to the landing position, and then a command is issued to reverse the car. Not only can the car be stopped at the normal landing position, but also it is possible to prevent the car 1 from significantly overshooting the normal landing position due to a delay in response.

FIG. 6 is a circuit diagram of a landing device showing another embodiment of the present invention.

In FIG. 6, the same reference numerals as in FIGS. 2 and 4 indicate the same parts.

In another embodiment of the present invention, two sets of landing devices shown in FIG. 2 are used, one landing device 12 is used for upward operation, and the other landing device 12' is used for downward operation. The landing device 12 outputs the output through the normally open contact 10MU of the precision landing speed operation relay during the ascending operation, while the landing device 12' outputs the output through the normally open contact 10MU of the precision landing speed operation relay during the descending operation. Normally open contact 10
The speed command value 12a of V _12a ' shown in FIG.
The guide plate 13 is placed below the regular landing device so that the
Even if the guide plate 13 is placed above the normal landing position so that the speed command value 12a corresponding to V _12a ' is output, the same effect as described above can be obtained, and the electrical characteristics can be adjusted to match. Another effect is that the parts are simplified and the time required for adjustment can be significantly reduced.

〔Effect of the invention〕

As described above, according to the present invention, with a simple configuration, it is possible to prevent the car from overshooting and stopping due to a delay phenomenon in the control system, and it is possible to always stop the car at a fixed position.

[Brief explanation of drawings]

Figure 1 is a system diagram showing an example of a conventional elevator speed control device with a feedback circuit;
FIG. 3 is a characteristic diagram showing the characteristics of the landing device in FIG. 2, and FIG. 4 is a circuit diagram showing a specific example of the landing device in FIG. FIG. 5 is a characteristic diagram showing the characteristics of the landing device in FIG. 4, and FIG. 6 is a circuit diagram of the landing device corresponding to FIG. 2 shown in FIG. FIG. 2 is a circuit configuration diagram of a landing device corresponding to FIG. 2 showing an embodiment. 12... Implantation device, 13... Guidance plate, 121, 12
2... Position detection coil, 10MU... Normally open contact of precision landing speed operation relay during ascending operation, 10MD...
Normally open contact of precision landing speed operation relay during descending operation.

Claims (1)

[Claims] 1. When a car driven by an electric motor lands on the floor, a speed command value for causing the car to travel according to the relative position of the car to a preset regular landing position of the floor on which the car should land. In the elevator speed control device, the elevator speed control device includes a landing device that emits a sound, and the electric motor is driven based on the speed command value from the landing device to control the car landing. A speed control device for an elevator, comprising means for switching the running polarity of the speed command value when the car is at a predetermined fixed position before the normal landing position.