JP2001294372A - Brake controlling device for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device controlling a brake for an elevator so as to suppress operation sound in a brake releasing time and so as to stably carry out opening operation. SOLUTION: A releasing time, when a bake coil is energized on the basis of a forcible excitation current command so as to release a brake for rapidly releasing a rotational body, is learned, and a differential value between the releasing time and an operation time from the start of release of pressure contact between a frictional material and the rotational body to the finish of release of the rotational body is computed so as to be used as a previously exciting time. During the previously exciting time, the brake coil is energized on the basis of the forcible excitation current command, and afterward, a switch to a silencing excitation current command is carried out and the brake coil is energized for releasing the brake.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator brake control device for reducing brake operation noise.

[0002]

2. Description of the Related Art FIG. 5 shows an example of an electromagnetic brake 22 commonly used in an elevator hoisting machine 20. When an elevator is stopped, a brake coil 30 is deenergized and a brake lever 25 is released. Arrow "F" by spring 26
The brake shoe 24 which is pushed in the direction and is supported by the brake lever 25 holds the brake wheel 23 from both sides to stop the rotation. Here, the brake wheel 23 is fixed to the rotating shaft 21 that drives the elevator up and down, and the elevator can be stopped by stopping the brake wheel 23. When the brake lever 25 moves in the direction of the arrow “F”, the L-shaped cam 2 is moved.
7 rotates in the direction of arrow "e" to push up the plunger 28. Therefore, the gap α corresponding to the plunger stroke
Occurs between the case 29 and the case 29.

A case where the electromagnetic brake 22 is released will be described with reference to FIG. When the brake release command DSB is issued at time t0 and the brake coil 30 is energized, the plunger 28 is attracted by the brake coil 30 and descends. This lowering causes the cam 27 to rotate in the direction of arrow B, and moves the brake lever 25 in the direction of arrow "C" against the spring 26. This movement releases the brake wheel 23 from the brake shoe 24.

By the way, with the release of the electromagnetic brake 22, a smooth transition to the driving torque by the electric motor must be made. Therefore, when the brake release command DSB is issued at time t0, the brake coil 30 is excited based on the forced excitation current command Is in order to release the electromagnetic brake 22 immediately. At time t11 after the time t0, the brake coil 30 is excited based on a silencing excitation current command Iw smaller than the forced excitation current command Is in order to reduce noise when the plunger 28 is sucked. When time t2 has elapsed from time t0, plunger 28 abuts against the inner lower surface of case 29, and gap α becomes substantially “0”. At this time, the brake switch BK is operated to output the release completion signal BKS, and the brake coil 30 is excited on the basis of the holding current command Ik necessary for continuing to suck the plunger 28, thereby suppressing the temperature rise of the brake coil 30. . The brake wheel 23 is released from the brake shoe 24, and the rotating shaft 21 drives the elevator up and down.

When the elevator arrives at the destination floor, the brake coil 30 is deenergized, and the brake shoe 24 holds the brake wheel 23 to stop the rotation as described above, and the stopped state is maintained. Japanese Patent Publication No. 8-15400 discloses a technique in which, when switching to a holding current, a change in inductance of a brake coil that occurs with an opening operation is detected and performed.

[0006]

As described above, the conventional elevator brake control apparatus uses the forced excitation current command I as described above.
s, the brake coil 30 is excited based on the silencing excitation current command Iw and the holding current command Ik, and the electromagnetic brake 22 is quickly released and the operation sound at the time of release is reduced. To suppress the temperature rise of the brake coil 30. by the way,
The temperature of the brake coil 30 also fluctuates due to fluctuations in the ambient temperature or the length of time the brake coil 30 is energized. Due to this change, the resistance changes and the electrical time constant of the coil changes. When the time constant fluctuates, the timing of transition from the forced excitation current command Is to the silencing excitation current command Iw must be changed in accordance with the fluctuation. However, conventionally, switching from the forced excitation current command Is to the muffling excitation current command Iw is always performed at a fixed time t11 after the brake release command DSB is issued. Therefore, the silencing excitation current command I
The switch to w is too early, and there is a problem that the brake coil 30 cannot smoothly attract the plunger 28 and a stable operation cannot be obtained. Further, if the switching is too slow, the plunger 28 hits the inner lower surface of the case 29 strongly, and a loud collision sound is generated when the electromagnetic brake 22 is opened.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to suppress the operation sound when the brake is released and to obtain a stable release operation.

[0008]

According to a first aspect of the present invention, there is provided an elevator brake control device, wherein a rotating member is opened after a friction material for generating a braking force by being pressed against the rotating member actually starts to release the pressure contact with the rotating member. When the brake coil is energized based on the forcible excitation current command to release the brake in order to quickly release the rotating body, the energization is started. In addition to measuring the opening time from when the rotating body is released until the rotating body is released, the learning mode that calculates the difference between the opening time and the operating time and sets it as the pre-excitation time is selectively implemented at appropriate time intervals. Normally, the brake coil is energized based on the forced excitation current command, and when the pre-excitation time calculated in the learning mode has elapsed from this energization, the brake coil is switched to a silencing excitation current command that reduces the operation sound of the brake. Energize In which it was to open the rake.

An elevator brake control device according to claim 2 records the measured release time retroactively from the latest one in a predetermined number of release time recording means, calculates an average value thereof, and calculates the average value. Is calculated on the basis of the following.

According to a third aspect of the present invention, the brake control device for an elevator releases a brake in a learning mode each time the elevator departs from a predetermined floor to update the pre-excitation time.

According to a fourth aspect of the present invention, the elevator brake control device is configured to release the brake in the learning mode each time the elevator has been activated a predetermined number of times to update the pre-excitation time.

[0012] In the elevator brake control device according to the present invention, the operation time from the time when the friction member which presses against the rotating body to generate the braking force actually starts releasing the pressure contact with the rotating body and the time when the rotating body is released is released. Was recorded in advance, and when the brake coil was excited based on the forced excitation current command, the operation start current became known as the current value at which the pressure contact between the friction material and the rotating body actually started to be released. At this time, the operation is switched to a silencing excitation current command for reducing the operation sound of the brake, and is energized to release the brake.

According to a sixth aspect of the present invention, there is provided an elevator brake control method, wherein an operation time from when the friction material which presses against the rotating body to generate a braking force actually starts releasing the pressure contact with the rotating body until the rotating body is released. Is recorded in advance, and the opening time when the rotating body is opened by energizing the brake coil based on the forced excitation current command for rapidly opening the rotating body is learned, and the difference from the operating time is determined. A learning release step that calculates the value and records it as the pre-excitation time, and switches to a silencing excitation current command that reduces the brake operation sound when the pre-excitation time has elapsed since the start of energizing the brake coil with the forced excitation current command The brake is released by a normal release step of releasing the rotating body by urging the brake.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 1 to 3 show:
Embodiment 1 Embodiment 1 of the present invention will be described. In the figure, reference numeral 1 denotes a brake having a configuration similar to that of the electromagnetic brake 22. The brake 1 generates a braking force by pressing a friction material 1b against a rotating body 1a to stop an elevator, thereby energizing a brake coil 1c. The frictional member 1b is released from the pressure contact by
a is released to release the braking force, and the elevator can be moved up and down. Reference numeral 2 denotes an operation time recording unit in which an operation time τ, which is known as a time from when the friction material 1b actually starts to press against the rotating body 1a until the rotating body 1a is released, is recorded in advance. This is the operating time of a mechanical element such as the plunger 28, and is less affected by temperature fluctuation.
Numeral 3 is a learning release means for urging the brake coil 1c based on the command Is from the forced excitation current command means 4 to release the brake 1 in order to rapidly release the rotating body 1a. The opening time t2 from when the power is started to when the rotating body 1a is opened is measured and recorded in the opening time recording means 5, and the difference between the opening time t2 and the operation time τ is calculated to calculate the pre-excitation time t1. Reservation time recording means 6
To record.

Reference numeral 7 designates a switch to a silencing excitation current command Iw for reducing the operation sound of the brake 1 when a pre-excitation time t1 has elapsed since the brake coil 1c was energized based on the forced excitation current command Is. The normal release means 8 for releasing the rotating body 1a is a selection means for selectively using the learning release means 3 and the normal release means 7. The learning release means 3 is selected at predetermined time intervals to release the brake 1. And encouragement time t
1 is updated, and the brake 1 is released by the normal release means 7 based on the updated pre-excitation time t1.

Next, the operation will be described. As shown in FIG. 3, assuming that the release command signal DSB is output at time t0, the process proceeds from step S11 to step S12 in FIG. 2, and the brake coil 1c is energized based on the forced excitation current command Is. It is assumed that the selection unit 8 has selected the learning release unit 3. In the case of the learning mode, as shown in FIG. 3C, the brake coil 1c is energized based on the forced excitation current command Is. Move from step S13 to step S14,
After waiting for the brake 1 to be released, the release time t2 from when the brake coil 1c is energized based on the forced excitation current command Is until when the rotating body 1a is released is measured in step S15. In step S16, the operation time τ is subtracted from the release time t2 to calculate the pre-excitation time t1. In order to suppress the temperature rise of the brake coil 1c in step S17, the release completion signal B
On the basis of KS, the forced excitation current command Is is switched to the holding excitation current command Ik to be energized and the brake 1 is kept open. The elevator continues the elevating operation and waits for arrival at the destination floor in step S22.

On the other hand, assuming that the normal release means 7 has been selected, the process proceeds from step S13 to step S18. In the case of the normal mode, the brake coil 1c is energized according to the pattern shown in FIG. That is, the forced excitation current command Is
When the propulsion time t1 elapses after being energized by the
At 19, the brake coil 1c is energized based on the silencing excitation current command Iw. When the brake 1 is released, step S20
When the release completion signal BKS is issued, the control is switched from the silencing excitation current command Iw to the holding excitation current command Ik to be energized and the brake 1 is kept released. Procedure S2
Waiting for the elevator to arrive at the destination floor in step 2, wait for step S2
In step 3, the brake coil 1c is deenergized to generate a braking force.
Stop the elevator. If the release command signal DBS has not been issued in step S11, the process proceeds to step S23, and the brake coil 1c remains deenergized.

According to the first embodiment, the brake 1 is released in the learning mode at predetermined time intervals, the release time t2 is measured and learned, and the pre-promotion time t1 is updated based on the measurement result. The brake coil 1c
Temperature can be changed from the forced excitation current command Is to the silencing excitation current command Iw in a timely manner even if the temperature fluctuates due to the fluctuation of the ambient temperature or by the biasing. Can be suppressed.

The selection of the learning opening means 3 by the selection means 8 may be performed each time the elevator departs from a predetermined floor, or may be performed each time the elevator is activated a predetermined number of times. As a result, the number of times the brake 1 is released by the forced excitation current command Is in the learning release unit 3 can be limited. Further, the propulsion time t1 may be calculated on the basis of the latest measured opening time t2, and may be retroactively recorded from the most recently measured opening time t2 and recorded in the predetermined number of opening time recording means 5. May be calculated, and the calculation may be performed based on this average value. Thereby, the degree of being affected by one measurement result can be reduced, and the promotion time t
1 can be improved.

Embodiment 2 FIG. 4 shows a second embodiment of the present invention. In the figure, the same symbols as those in FIG. 1 indicate the same parts. 12 is a silencing excitation current command means for outputting a silencing excitation current command for reducing the operation sound of the brake, and 13 is a friction material 1
The operation start current recording means 14 records the operation start current It, which is known as the current value when b actually starts to press-contact with the rotating body 1a, and the operation start current It is recorded. The brake current detecting means 15 for detecting the brake current Ib and the operation start current I
The comparator 16 outputs a switching signal when Ib ≧ It, and outputs a switching signal from the forcible exciting current commanding means 4 based on the switching signal from the comparator 15.
2 is a switching means for switching to 2.

Next, the operation will be described. As in the first embodiment, assuming that release command signal DSB is issued, brake coil 1c is initially energized in accordance with forced excitation current command Is. The brake current Ib is detected by the brake current detecting means 1
4 and is compared with the operation start current It by the comparator 15. As a result of this comparison, when it is detected that the brake current Ib has exceeded the operation start current It, the comparator 1
5 outputs a switching signal. The switching means switches from the forced excitation current command Is to the silencing excitation current command Iw in response to the switching signal. By this switching, the operation sound when the brake 1 performs the opening operation can be reduced.

According to the second embodiment also, the brake current Ib actually being operated is detected and compared with the operation start current It.
Due to fluctuations in ambient temperature or even due to bias,
It is possible to switch from the forced excitation current command Is to the silencing excitation current command Iw in a timely manner, and it is possible to suppress a stable opening operation and an operation sound at the time of opening. In particular, since the learning mode, which is indispensable in the first embodiment, is not required, it is not necessary to release the brake 1 by the forced excitation current command Is, and the operation sound accompanying the release of the brake can be further reduced.

[0023]

Since the present invention is configured as described above, it has the following effects. The brake control device for an elevator according to claim 1 records in advance the operating time from when the friction material, which presses against the rotating body to generate a braking force, actually releases the pressure contact with the rotating body until the rotating body is released. Then, when the brake coil is energized based on the forced excitation current command to release the rotating body rapidly and the brake is released, from when the energization is started until the rotating body is released While learning by measuring the opening time of the, the opening by the learning mode of calculating the difference between the opening time and the operating time and calculating the pre-excitation time is selectively implemented at appropriate time intervals,
Normally, in the process of energizing the brake coil based on the forced excitation current command, when the pre-excitation time obtained by opening in the learning mode elapses, it is switched to the silencing excitation current command to reduce the brake operation sound. This is to release the brake with force. Therefore, the promotion time t1
Is updated in the learning mode, so that even if the temperature of the brake coil fluctuates due to fluctuations in the ambient temperature or due to energization, it is possible to switch from the forced excitation current command to the silencing excitation current command in a timely manner. This has the effect of suppressing the operation sound during operation and opening.

According to a second aspect of the present invention, the elevator brake control device records the measured release time retroactively from the latest one in a predetermined number of release time recording means, calculates an average value thereof, and calculates the average value. Is calculated on the basis of the following. For this reason, it is possible to reduce the degree of influence of one measurement result, and to improve the reliability of the promotion time.

According to a third aspect of the present invention, the brake control device of the elevator is configured to release the brake in the learning mode each time the elevator departs from a predetermined floor to update the pre-excitation time. For this reason, there is an effect that the number of times the brake is released can be limited based on the forced excitation current command in the case of the learning release means.

According to a fourth aspect of the present invention, the elevator brake control device releases the brake in the learning mode each time the elevator has been activated a predetermined number of times to update the pre-excitation time. This also has the same effect as above.

According to a fifth aspect of the present invention, in the elevator brake control device, the friction member that generates a braking force by pressing against the rotating body actually starts releasing the pressure contact with the rotating body until the rotating body is released. The time is recorded in advance, and when the brake coil is excited based on the forced excitation current command, the operation start current becomes a current value known as a current value at which the pressure contact between the friction material and the rotating body actually starts to be released. In this case, the brake operation is switched to a muffling excitation current command for reducing the operation sound of the brake, and the brake is released by energizing the command. For this reason, even in this case, even if the temperature of the brake coil fluctuates due to fluctuations in the ambient temperature or due to energization, it is possible to timely switch from the forced excitation current command to the silencing excitation current command, There is an effect that a stable opening operation and an operation sound at the time of opening can be suppressed. In particular, since there is no need to provide the learning mode, the brake is not released in the state of the forced excitation current command.

According to a sixth aspect of the present invention, there is provided an elevator brake control method, wherein the friction material for generating a braking force by being pressed against the rotating body actually starts releasing the pressure contact with the rotating body until the rotating body is released. Is recorded in advance, and the opening time when the rotating body is opened by energizing the brake coil based on the forced excitation current command for rapidly opening the rotating body is learned, and the difference from the operating time is determined. A learning release step that calculates the value and records it as the pre-excitation time, and switches to a silencing excitation current command that reduces the brake operation sound when the pre-excitation time has elapsed since the start of energizing the brake coil with the forced excitation current command The brake is released by a normal release step of releasing the rotating body by urging the brake.
Even in this case, the same effects as those of the first aspect of the invention can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation according to the first embodiment of the present invention.

FIG. 3 is an operation explanatory diagram according to the first embodiment of the present invention.

FIG. 4 is a block diagram showing an overall configuration according to a second embodiment of the present invention.

FIG. 5 is a front view of an electromagnetic brake assembled integrally with the hoist.

FIG. 6 is an operation explanatory diagram of a conventional elevator brake control device.

[Explanation of symbols]

1 brake, 1a rotating body, 1b friction material, 1
c brake coil, 2 operation time recording means, 3 learning release means, 4 forced excitation current command means, 5 release time recording means, 6 pre-bell time recording means, 7 normal release means, 8 selection means, 12 silencing excitation current command means,
13 operation start current recording means, 14 brake current detection means, 15 comparator, 16 rewriting means, 20
Hoisting machine, 21 rotating shaft, 22 electromagnetic brake, 2
3 brake car, 24 brake shoes, 25 brake lever, 26 spring, 27 cam, 28 plunger, 29 case, 30 brake coil,
BK brake switch.

Claims (6)

[Claims] 1. A brake coil is deenergized and a friction material is pressed against a rotating body to generate a braking force to stop an elevator. When a start command is issued to the elevator, the brake coil is energized. In an elevator brake control device that releases the pressure contact of the friction material, releases the rotating body to release the braking force, and allows the elevator to move up and down, the friction material actually presses the rotating body. Operating time recording means, which is known as an operating time from when the rotating body is started until the rotating body is released, and is recorded in advance, and the brake coil based on a forced excitation current command for rapidly opening the rotating body. The brake is released by urging, and the opening time from when the urging is started until the rotating body is released is measured and recorded in the opening time recording means. Learning release means for calculating a difference value between the release time and the operation time and recording the difference value in the pre-excitation time recording means as a pre-excitation time, and the above-described operation after the brake coil is energized based on the forcible excitation current command. When the pre-excitation time has elapsed, select the normal release means for switching to the muffling excitation current command to reduce the operation sound of the brake and energize it to release the rotating body, and select the learning release means at predetermined time intervals. Releasing the brake to newly calculate and renew the pre-promotion time, and selecting means for releasing the brake by the normal release means based on the renewed pre-promotion time. Control device. 2. The learning release means records the measured release time retroactively from the latest one in a predetermined number of release time recording means, calculates an average value thereof and sets it as the release time. 2. The elevator brake control device according to claim 1, wherein a difference value from the time is set as a pre-excitation time. 3. The elevator brake control device according to claim 1, wherein the selection means selects the learning release means and releases the brake each time the elevator departs from a predetermined floor. 4. The elevator brake control device according to claim 1, wherein the selection means selects the learning release means and releases the brake each time the elevator repeats a predetermined number of activations. 5. A brake coil is deenergized and a friction material is pressed against a rotating body to generate a braking force to stop the elevator. When a start command is issued to the elevator, the brake coil is energized. In an elevator brake control device for releasing the pressure contact of the friction material, releasing the rotating body to release the braking force, and enabling the elevator to move up and down, a brake current detection for detecting an exciting current of the brake coil Means, and when the brake coil is energized based on a forced excitation current command to rapidly release the rotating body, the brake current detecting means realizes pressure contact between the friction material and the rotating body. When the operation start current known as the current value at which the brake is started to be released is detected, the silencing excitation electric current for reducing the operation sound of the brake from the forced excitation current command is detected. And a switching means for switching the flow command to energize the brake coil to release the rotating body. 6. A brake coil is deenergized and a friction material is pressed against a rotating body to generate a braking force to stop the elevator. When a start command is issued to the elevator, the brake coil is energized. In an elevator brake control method for releasing the pressure contact of the friction material, releasing the rotating body to release the braking force, and enabling the elevator to perform an ascending and descending operation, the friction material actually presses the rotating body with the rotating body. An operation time recording step of pre-recording an operation time known as a time from the start of unraveling until the rotating body is opened, and selected at predetermined time intervals,
The brake coil is energized to open the rotating body based on a forced excitation current command for rapidly opening the rotating body, and the opening time from the energization to the opening is measured to determine the operating time. A learning release step of recording a difference value between the brake release coil and the brake excitation coil according to the forcible excitation current command. A normal opening step of switching to a silencing excitation current command to reduce the operating noise of the rotating body and energizing the same to open the rotating body.