CN1953923B

CN1953923B - Control device and method of elevator

Info

Publication number: CN1953923B
Application number: CN2005800155228A
Authority: CN
Inventors: 仮屋佳孝
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2005-05-11
Filing date: 2005-05-11
Publication date: 2011-05-18
Anticipated expiration: 2025-05-11
Also published as: WO2006120737A1; EP1880966A1; JPWO2006120737A1; CN1953923A; EP1880966B1; EP1880966A4; JP4919800B2

Abstract

In an elevator having sheaves and motors for individually driving the sheaves, an abnormality of traction loss of the sheaves is prevented. A control device for an elevator has a main rope for connecting an elevator car and a counterbalance weight, sheaves on which the main rope is passed, motors for individually driving the sheaves, and speed control devices for individually controlling torque of the motors. The control device performs a required operation mode according to speed command values to the speed control devices. The control device further has an abnormality detection device for comparing torque command values of the speed control devices and, when the resultant difference exceeds a predetermined standard value, outputting an abnormality signal based on its determination that any one of the sheaves has traction loss.

Description

Elevator control device and control method

Technical field

The elevator control gear that the present invention relates to have a plurality of pulleys and drive the motor of these pulleys respectively.

Background technology

For example patent documentation 1 is disclosed such, and this elevator in the past has: the main rope that engages car and counter weight; Reeled a plurality of pulleys of this main rope; Drive a plurality of motors of these pulleys respectively; And a plurality of speed control units of controlling the torque of these motors respectively, this elevator in the past is according to the speed value of these speed control units is carried out needed operation mode.

Patent documentation 1 Japanese kokai publication sho 55-106971 communique

In this elevator control gear, usually it is identical to be controlled to be the main rope speed that makes the part that is wound on each pulley, but when producing velocity contrast for the moment for a certain reason, exist the tension force between two pulleys to descend, main rope is lax, produce " traction breaks away from " at side's pulley, cause pulley idle running, can not drive the situation of elevator.In addition, said herein " traction breaks away from " is meant that the tractive force that makes for a certain reason between pulley and the main rope descends, and the result forms the state that main rope skids, pulley dallies.

Summary of the invention

The present invention proposes in order to address the above problem, and its purpose is, has a plurality of pulleys and is driving respectively in the elevator of motor of these pulleys, and the traction of anti-limited slip wheel breaks away from, and improves the safety of elevator.

Elevator control device of the present invention, this elevator has: the main rope that engages car and counter weight; Reeled a plurality of pulleys of this main rope; Drive a plurality of motors of these pulleys respectively; And a plurality of speed control units of controlling the torque of these motors respectively, according to the speed value of these speed control units is carried out needed operation mode, in this control setup, also has abnormal detector, it is the torque instruction value separately of each speed control unit relatively, when its difference surpasses predetermined reference value, be considered as any pulley and produce the traction disengaging, and output abnormality signal, exported at abnormal detector under the situation of abnormal signal, operation mode according to this moment, change is to the speed value of each speed control unit, to carry out promptly stopping of elevator, speed reduces, any action during acceleration-deceleration reduces.

According to the present invention, have a plurality of pulleys and driving respectively in the elevator of motor of these pulleys, can detect the idle running that causes because of certain pulley traction disengaging, running state reduction acceleration/accel, constant speed, deceleration/decel according to elevator move, breaking away from error state from traction thus recovers normal and moves, perhaps, can before causing secondary failure, promptly stop, safer elevator control device can be provided not recovering under the normal situation from traction disengaging error state.

Description of drawings

Fig. 1 is the explanation block diagram of the elevator control gear of expression embodiments of the present invention 1.

Fig. 2 is the block diagram of the abnormal detector of expression embodiment 1.

Fig. 3 is the figure of signal condition of the action of the expression abnormal detector that is used to illustrate embodiment 1.

Fig. 4 is the diagram of circuit that is used to illustrate the action of embodiment 1.

Label declaration

1 car; 2 counter weights; 3 main ropes; The 4a pulley; The 4b pulley; The 5a motor; The 5b motor; The 6a speed control unit; The 6b speed control unit; 7 speed command generation devices; 8 abnormal detectors

The specific embodiment

Below, according to Fig. 1 embodiments of the present invention 1 are described.

In Fig. 1, car 1 is connected by main rope 3 with counter weight 2, and is wound on two pulley 4a, the 4b that driven by different elevator motor 5a, 5b.When driving elevator, from speed command generation device 7 to the speed control unit 6a of each elevator motor 5a, 5b, the car speed command value that 6b provides elevator, thereby each speed control unit 6a, 6b offer each elevator motor 5a, 5b to torque instruction value and control their output torque, make them follow separately speed value, by driving each pulley 4a, 4b main rope 3 is rolled, made lift car 1 operation.The abnormal detector 8 relatively output signal of each speed control unit 6a, 6b is torque instruction value τ a and τ b, reach predetermined reference value when above in its difference, being considered as traction breaks away from unusual and to speed command generation device 7 output abnormality signals, according to the operation mode of elevator at this moment, change speed value a, b for each speed control unit 6a, 6b.

Fig. 2 represents the concrete structure of abnormal detector 8, the signal condition of the each several part when Fig. 3 represents abnormality detection.In Fig. 2, be torque instruction value τ a and τ b computing according to the output signal of speed control unit 6a, 6b by arithmetic and logic unit 81 | τ a-τ b|, and input comparator 82.

In this embodiment 1, the diameter of establishing two pulley 4a, 4b is identical, therefore when elevator normally moves, and τ a roughly

τ b.

Herein, for example when the traction of pulley 4b breaks away from (Fig. 3 A), pulley 4b idle running is so torque instruction value τ b reduces.Thereupon, need export necessary torque, so torque instruction value τ a rises by motor 5a.Therefore, | τ a-τ b| gets certain bigger value.So, by comparator 82 relatively | τ a-τ b| and predetermined a reference value T, when | τ a-τ b|＞T, output abnormality judgement symbol (Fig. 3 B).And, when unusual judgement symbol continues during certain hour t1, make latch cicuit 83 be latched as abnormal signal (Fig. 3 C).Thus, can detect the traction disengaging of pulley 4b.

, survey herein, get certain hour t in order flase drop not occur ₁, but also can be made as t ₁=0 and instant the detection.

And, in this embodiment, if the diameter of pulley 4a, 4b is identical, but when the diameter of each pulley 4a, 4b is different diameter Da and Db, can compare by comparator 82 | Da * τ a-Db * τ b| and predetermined a reference value T ', when | Da * τ a-Db * τ b|＞T ', the output abnormality judgement symbol.

Fig. 4 is the diagram of circuit that is used to illustrate the action of embodiments of the present invention 1.

At first, judge whether just to be in operation,, then judge whether to detect traction and break away from unusual in step 200 if be in operation in step 100.Break away from when unusual detecting traction, then judge operation mode.At first, judge whether to quicken,, then make it reduce acceleration operation in step 301 if in acceleration in step 300.If not in acceleration, then judge whether just in constant-speed operation in step 310.If in constant-speed operation, then make its operation that underspeeds in step 311.If not in constant-speed operation, then in deceleration,,, then make it reduce the deceleration/decel operation in step 321 if deceleration distance is enough so judge in step 320 whether deceleration distance is enough.If deceleration distance is not enough, then elevator emergency is stopped in step 700.

Reduce acceleration/accel, constant speed, deceleration/decel respectively in step 301,311,321, after step 400 judges to detect unusually, whether passed through certain hour t ₂, passing through certain hour t ₂After, judge whether in step 500 | τ a-τ b|＞T.When | τ a-τ b|≤T, it is normal and continue to advance to be considered as breaking away from abnormal restoring from traction in step 600.If be still | τ a-τ b|＞T, then being judged as can not be normal from traction disengaging abnormal restoring, in step 700 elevator emergency is stopped.

Thus, break away from when unusual having produced traction, move by reducing acceleration/accel, constant speed, deceleration/decel, it is normal to break away from abnormal restoring from traction, makes elevator safety operation.And,, can prevent that elevator from producing secondary failure not stopping by making elevator emergency when traction breaks away from abnormal restoring.

In addition, the invention is not restricted to the situation of two groups of pulleys and motor, equally also go for three groups of above situations.

Claims

1. elevator control device, this elevator has: the main rope that engages car and counter weight; Reeled a plurality of pulleys of this main rope; Drive a plurality of motors of these pulleys respectively; And a plurality of speed control units of controlling the torque of these motors respectively, this elevator is characterized in that according to the speed value of these speed control units is carried out needed operation mode,

This elevator control device has abnormal detector, and the torque instruction value separately of more described each speed control unit of this abnormal detector when its difference surpasses predetermined reference value, is considered as any pulley and produces the traction disengaging, and the output abnormality signal,

Exported at described abnormal detector under the situation of abnormal signal,, changed speed value described each speed control unit according to the operation mode of this moment, with carry out promptly the stopping of elevator, speed reduces, acceleration-deceleration any action in reducing.

2. elevator control device according to claim 1 is characterized in that, described abnormal detector under the situation that described a plurality of pulleys are made of the 1st and the 2nd pulley that has different-diameter Da, Db respectively, according to following formula output abnormality signal,

|Da×τa-Db×τb|＞T’

Wherein, τ a: the torque instruction value of the speed control unit of the motor of next self-driven the 1st pulley

τ b: the torque instruction value of the speed control unit of the motor of next self-driven the 2nd pulley

T ': predetermined reference value.

3. elevator control device according to claim 1, it is characterized in that, after the speed or acceleration-deceleration that reduce elevator, the torque instruction value separately of more described speed control unit, do not drop to described a reference value yet when following in its difference, elevator emergency is stopped.

4. the control method of an elevator, this elevator has: the main rope that engages car and counter weight; Reeled a plurality of pulleys of this main rope; Drive a plurality of motors of these pulleys respectively; And a plurality of speed control units of controlling the torque of these motors respectively, according to the speed value of these speed control units is carried out needed operation mode, it is characterized in that,

The torque instruction value separately of more described each speed control unit of control method of this elevator, when its difference surpasses predetermined reference value, operation mode according to this moment, change is to the speed value of described each speed control unit, with carry out promptly the stopping of elevator, speed reduces, acceleration-deceleration any action in reducing.