JPH0445078A - Elevator controller - Google Patents

Abstract

PURPOSE:To secure the normal travel even if one phase gets out of order by detecting a current at each phase of an elevator cage driving three-phase induction motor and performing a job for supply current control while, when something is wrong with one detector, making it so as to be controlled with the remaining two-phase detection currents. CONSTITUTION:Trouble in current detectors 15-17 detecting each phase current of a three-phase induction motor 5 is detected by a trouble detector 31, and according to the troubled phase, each of trouble detection signals 31a-31c is outputted to a current control circuit 14. When these trouble detection signals 31a-31c are inputted, a microcomputer, constituting this current control circuit 14, operates a pulse-width-modulation(PWM) signal with the remaining two-phase detection current, outputting it to an inverter 4. Thus, normal operation can be done even if one-phase detector gets out of order.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an elevator control device, and in particular,
The present invention relates to an elevator control device that detects the current of each phase of a three-phase induction motor to control the running speed of a car.

[Prior Art] FIG. 4 is an overall configuration diagram showing a conventional elevator control device disclosed in, for example, Japanese Unexamined Patent Publication No. 63-171181.

In the figure, (1) is a three-phase AC power supply, (2) is a converter that converts AC to DC, (3) is a smoothing capacitor, (
4) is an inverter that converts DC to AC, (5) is a three-phase induction motor, (6) is a sheave driven by the three-phase induction motor (5), (7) is a diverter, and (8) is an elevator. The car, (9) is the counterweight, (10) is the elevator car (8)
and the rope connecting the counterweight (9), (]1) is a speed detector that detects the rotation speed of the three-phase induction motor (5);
1a) is a speed detection signal output from the speed detector (]]), (12) is a speed command generation circuit, (1, 2a)
) is the speed command issued from the speed command generation circuit (]2), (]3) is the speed control circuit, (,13a) is the torque command issued from the speed control circuit (13), (14)
) is a current control circuit, and (14a) to (14e) are U output from the current control circuit (14) to the inverter (4).

V, W phase (7) PW'M signal, (15) to (17) are current detectors that detect the U, V, and W phase currents of the three-phase induction motor (5), (15a) to (17a), respectively. ) are current detection signals output from each of the current detectors (]5) to (17).

The current control circuit (14) marked 1- has a control system as shown in FIG. FIG. 5 is a system diagram showing a control system of the current control circuit of the elevator control device of FIG. 4.

In the figure, (18) and (19) are coordinate conversion circuits, and (18a) and (18b) are current detection signals (15a
) ~ · (1, 7a, ) are coordinate transformed by the coordinate transformation circuit (18) to obtain current components, (20) and (2
1) is the current component (18a) from the coordinate conversion circuit (18)
, (18b), and (20a)
and (21a) are the output signals output from each multiplier (20) and (21), and (22) is the current component (18a) from the coordinate conversion circuit (18) and the output signal from the multiplier (20). It is an adder (22) that adds (20a) and (22
a) is the output signal output from the adder (22), (23
) is a subtracter that subtracts the output signal (21a) of the multiplier (21) from the current component (18b) of the coordinate conversion circuit (18), and (23a) is the output signal output from the subtracter (23); (24) and (25) are both the subtracter (23)
(26) is an excitation current command input to the subtractor (24), (27) is an excitation current control circuit,
(27a) is the output signal output from the excitation current control circuit (27) to the coordinate conversion circuit (19), (28) is the torque current control circuit, and (28a) is the torque current control circuit (
The output signal output from 28) to the coordinate conversion circuit (19), (29) is a phase circuit, and (29a) is a phase circuit (
The output signal (30) output from 29) is an adder that adds the torque command (13a) and the speed detection signal (1, 1a).

Next, the operation of the conventional elevator control device having the above configuration will be explained.

When a speed command (]2a) is issued from the speed command generation circuit (12) to the speed control circuit (13), the speed control circuit (1
In step 3), comparison control with the speed detection signal (lla) is performed, and a torque command (13a) is output to the current control circuit (14). Then, a predetermined control calculation is performed in the current control circuit (14).

That is, the current control circuit (14) uses a three-phase induction motor (
The three-phase current detection signals (15a) to (17a) of 5) are converted into two-axis current components (18a),
(18b) and performs control calculations on each component to obtain a signal (22a) of the excitation current component and a signal (23a) of the torque current component. Both of these signals (22a), (2
3a) is the excitation current command (26) and the torque command (13a)
), the excitation current control circuit (27) and the torque current control circuit (28) perform control calculations, and the output side coordinate conversion circuit ( 19), the coordinates are converted from two axes to three phases by this coordinate conversion circuit (19), and output as PWM signals (14a) to (14C).

Then, the PWM signals (14a) to (14a) generated in this way are
14e) from the current control circuit (14) to the inverter (4)
The inverter (4) converts the DC power into a predetermined AC power according to the PWM signals (14a) to (], 4e), drives the three-phase induction motor (5), and operates the elevator. The running speed of the car (8) is controlled.

Here, the coordinate transformation calculation performed by the coordinate transformation circuit (18) will be described. This coordinate conversion circuit (18) performs calculations as shown in the following equation.

In addition, ”In formula 1, id-output signal (22a) iq-output signal (23a) iu-current detection signal (15a) iv-current detection signal (16a) iw-current detection signal (17a) It is.

[Problems to be Solved by the Invention] In the conventional elevator control device as described in -■-, the current detectors (15) to (17) control the three-phase induction motor (
5), the speed of the elevator car (8) was controlled by detecting the current in each phase.

However, if the negative phase of the three-phase current detectors (15) to (17) breaks down due to some reason,
Coordinate transformation cannot be performed correctly, resulting in inappropriate PWM
This signal caused the elevator car (8) to move abnormally. Therefore, in such cases, safety devices (not shown) may be required.
etc. 5, and the movement of the elevator car (8) was forcibly stopped. However, there is a high possibility that the stopping position of the elevator car (8) at this time is between floors, and even if an attempt was made to move it to the nearest floor by rescue operation, an inappropriate PWM signal was not received. Therefore, the elevator car (
8) became abnormal, the elevator could not run normally, and the passengers were trapped inside the elevator car (8).

Therefore, even if one phase of the current detector that detects the three-phase current of a three-phase induction motor fails, the speed of the elevator car can be controlled at the same level, and the elevator can run normally. The object of the present invention is to provide an elevator control device that can perform the following functions.

[Means for Solving the Problems] The elevator control device according to the present invention includes a car driving means for driving an elevator car (8) by a three-phase induction motor (5), and a current control device for driving the elevator car (8) by a three-phase induction motor (5). a current detection means for detecting a current detection means; a control calculation means for performing control calculation of a current supplied to the two-phase induction motor (5) using a current detected by the current detection means; and a control calculation means for detecting a failure of the current detection means. a failure detection means; and when the failure detection means detects a failure of the current detection means, a control calculation is performed on the current supplied to the three-phase induction motor (5) using detected currents of other phases outside the failure detection circuit. The system also includes a failure control calculation means for performing failure control calculation means.

[Operation] In the present invention, current detecting means detects the current of each phase of the three-phase induction motor (5) that drives the elevator car (8), and the current detected by the current detecting means is used to detect the three-phase induction motor. The speed of the elevator is controlled by the control calculation means that performs control calculation of the current supplied to the electric motor (5).
7 4) +1shi~Ko ζH Ding Ceremony 1 Ken-■Giant J
=l Using the detected currents of the normal two phases other than the faulty phase, the fault control calculation means detects the positive phase induction motor (5).
) and performs control calculations on the current supplied to the elevator to control the speed of the elevator.

Examples] The present invention will be explained in detail below.

FIG. 1 is an overall configuration diagram showing an elevator control device according to an embodiment of the present invention. In the figure, the 4th part of the conventional example marked 4F
Same as in the figure.=- Codes and symbols indicate the same or equivalent components as those in FIG. 4 of the conventional example described in 1-1. (17)
Failure detection circuits (31a) to (31C) that detect failures in
) is a failure detection signal output from the failure detection circuit (31) to the current control circuit (14). (32) is a microcomputer that constitutes the current control circuit (4) and the like.

Here, the pole +1- of this micro combi coater (32)
1 + 1 + - Ilak-eup attack
It is a block diagram showing the microcomputer of the control device of the ^Il Beta.

In the figure, (33) is a central processing unit (FCPυ
”), (34) is readable memory (rR
AMj), (35) is a read-only memory (hereinafter referred to as rRQM), and (36) to (38) are analog-to-digital converters (hereinafter referred to as "A/Dj") that convert analog signals to digital signals. ), and converts each current detection signal (]5a) to (17a) into a digital signal.

(39) to (4)) are the torque command (13a), the speed detection signal (ila), and each failure detection signal (31a) to (31c).
) respectively to the CPU (33) l: Interface for importing (hereinafter referred to as r I /FJ), (42) ~
(44) is the PWM signal (14a) ~ (1,, 4e)
1/F for outputting from the CPU (33), (45
) is a bus which is a data path within the microcomputer (32).

In addition, the ROM (
35) stores a predetermined program. Figure 3 shows Figure 2's 'N Ikuo En view, evening C.
2 is a flowchart showing program D graph 1 processed by the PU.

Next, the operation of the control device for the elevator of this embodiment of the l-formation acid will be explained along the flow of the near-0-chia river in FIG. 10. However, 7. Each current detector (]5)
If ~(17) operates normally, the speed of the J-levator is controlled in the same manner as in Example ♂ of L.
Explanation in this case will be omitted.

In Fig. 3, when an abnormality occurs in any of the current detectors (15) to (17), the failure detection circuit (3]) detects this [2, [J' , V, and W phases, respectively.
1c) becomes "1". Note that failure detection can be done by, for example,
It can be detected by any of the current detection signals (:1., 5a, ) to (17a) becoming zero for a predetermined time, and is not particularly limited.

First, in step S1, the U-phase failure detection signal (3]-a)
is "1" or not. U-phase failure detection signal (31
If a) is "1", it means that the U-phase current detector (15) is out of order, and in this case, proceed to step S5,
Other E-phase (V-phase and W-phase) current detectors (], 6)
, (17) are normal or not. In other words, the failure detection signal ζJ of phase ■ (31b) + the failure detection signal of phase W (31e
) is rOJ. Other two-phase current detector (
16) When (17) is normal, the ■ phase failure detection signal (3l b) and the W phase failure detection signal (31c) are “0”.
In this case, iu is changed to iv+iw in step s7.
Find it with In addition, as mentioned above, the iu-current detection signal (1
5a), iv-current detection signal (16a), and iw-current detection signal (17a). Further, in step S5, the V phase failure detection signal (31b) + the W phase failure detection signal (31c
) is not FOj, in addition to the U-phase current detector (15), any of the other two-phase current detectors (16) and (17), or all the current detectors (15) to (17
) is a failure, so in this case, abnormality detection processing is performed in step S6.

In step S1, the U-phase failure detection signal P, (31a) is
1" and the U-phase current detector (15) is normal, then in step S2 the V-phase failure detection signal (3l
Determine whether b) is "1".

■If the phase failure detection signal (3l b) is “1”, ■
If the phase current detector (16) is out of order -ζ, the process proceeds to step S8 and it is determined whether the remaining phase (W phase) current detector (17) is normal. In other words, it is determined whether the W-phase failure detection signal (31e) is FOj or not.

If the current detectors (17) of the remaining phases are normal,
In step S9, 2 normal current detectors (15),
From the current detection signals (15a) and (17a) from (17), iv is determined as iu+iW. Also, step S8
If the W-phase fault detection signal (31c) is not "0", the W-phase current detector (]7) is also faulty in addition to the ■-phase current detector (16). is step S
In step 6, the abnormality detection process is performed.

Furthermore, in step S1, the U-phase failure detection signal (31a,)
is not [ko], and in step S2, the V-phase failure detection signal (
If 31b) is not "]", it means that both the U-phase and V'-phase current detectors (15), (1, 6) are DIE, and in this case, the W It is determined whether the phase failure detection "y (31e)" is "]" or a fortune-telling. If the W-phase failure detection signal (3], e) is “1”,
This is a case where the W-phase current detector (17) is out of order. In this case, the process proceeds to step S]0, and the two normal current detectors (15), (16) of the U-phase and V' phase are detected. Current detection signal from (],, 5 a) (16a) l: From,
iw as iu+iv: @;Zru.

Then, in step S7, step S9, and step S10, the current detectors (15) to (17) of the phase related to the failure are
), the current detection signals (15a,) to (1, 7a, . Further, if all three-phase current detectors (15) to (17) are normal in step S3 from step S], the process proceeds directly to step S4, and each current detection signal (15a) to
Coordinate transformation of Nu, iv, and iw is performed according to (17a). This coordinate transformation is performed by the current control circuit (14), and since the coordinate transformation itself is the same as in the conventional example (see FIG. 5 for the conventional example), a detailed explanation of each component will be omitted.

However (2, current detector (:Ir)),
If there is a failure in (]6) or (17) (,1□!), the coordinate transformation in step S4 is not performed, the abnormality detection process is performed in step S6, and the safety device @ (not shown) is activated.
J. The elevator will stop.

Then, the coordinate-transformed and control-calculated PWM signal is output from the current control circuit (14) to the inverter (4), as in the conventional case, and this inverter (4) drives the two-phase induction motor (5). 2, the running speed of the elevator car (8) is controlled.

As described in -1-, the control device of the Nilevator of this embodiment converts the three-phase AC power supply (], ) into a predetermined quality phase pseudo AC using the converter (2) and the inverter (4),
and a car driving means for driving the elevator car (8) by supplying the current to the three-phase induction motor (5), and a current detector (15) for detecting the current of each phase of the two-phase induction motor (5). ) to (17), and a current control circuit (4) that performs control calculations on the current supplied to the two-phase induction motor (5) using the current detected by the current detection means. A failure detection means includes a calculation means, a failure detection circuit (31) for detecting a failure of the current detection means for each phase, and a failure of the current detection means is detected by the failure detection means.

A failure control calculation means comprising a microcomputer (32) that performs control calculations on the current supplied to the three-phase induction motor (5) using detected currents of two phases other than the phase related to failure detection when the failure occurs. It is equipped with

Therefore, when each of the current detectors (15) to (7) of one phase to one phase as the current detection means all operate normally, each phase by the current detectors (15) to (17) Using the detected current, control calculation of the current supplied to the three-phase induction motor (5) is performed by the control calculation means consisting of the current control circuit (4). Then, PWM signals (14a) to (14e) are outputted from the current control circuit (4) to the inverter (4) to drive the three-phase induction motor (5) through the inverter (4). Elevator car (8
) is controlled.

In addition, if the current detectors (15) to (17) related to any one of the current detectors 05) to (1, 7) fail, the other two phase currents that operate normally Detector (1
Using the detected currents from 5) to (17), the microcomputer (32) performs control calculations on the current supplied to the three-phase induction motor (5). Then, as in the above, the current control circuit (14) sends the PWM signal (1, 4
a) to (14c) are output to the inverter (4), which drives the three-phase AC power supply machine (5) to control the running speed of the elevator car (8). .

Therefore, in this embodiment, the current detector (1
Even if the current detectors (15) to (17) related to any of the phases 5) to 7) fail, the correct speed control of the elevator car (8) is performed, so the conventional Similarly, when a safety device (not shown) is activated and the movement of the elevator car (8) is stopped and the elevator car (8) is stopped between floors 7, the nearest It can be moved up to the floor by predetermined speed control. As a result, passengers are no longer trapped inside the elevator car (8).

By the way, in the above embodiment, the three-phase current detector (15)
If the negative phase of ~(17) fails, the current control by the three-phase current detectors (15)~(17) is changed to the other normal two-phase current detectors (15)~(17). ), we have described a technology for controlling the elevator by switching to current control using the current control method. The rescue operation of the elevator may be performed by current control using the normal two-phase current detectors (15) to (17). The purpose of this elevator rescue operation is to prevent passengers from becoming trapped in the elevator car (8), and it is unavoidable that the running performance and ride comfort may deteriorate.

[Effects of the Invention] As described above, the elevator control device of the present invention includes a car driving means for driving the elevator car by a three-phase induction motor, and a current detection means for detecting the current of the three-phase induction motor. ]゛, a control calculation means for performing control calculation of the current supplied to the phase induction motor; a failure detection means for detecting a failure of the current detection means; and a failure control calculation means for performing control calculation of the current supplied to the three-phase induction motor when detected, and when the current detection means always operates, the current detected by the current detection means is used. control calculation means performs control calculation of the current supplied to the three-phase induction motor, and when the failure detection means detects a failure in the current detection means, the control calculation means performs control calculation of the current supplied to the three-phase induction motor, and when the failure detection means detects a failure in the current detection means, Since the detected current is used to control the current supplied to the three-phase induction motor by the failure control calculation means,
Even if the phase component of the current detection means fails,
The speed of the elevator can be controlled, and passengers are no longer trapped inside the elevator, improving safety.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an elevator control device according to an embodiment of the present invention, FIG. 2 is a configuration diagram showing a microcomputer of the elevator control device shown in FIG.
is a flowchart showing a program processed by the CPU of the microcomputer shown in FIG. 2, FIG. 4 is an overall configuration diagram showing a conventional elevator control device, and FIG. 5 is a current control circuit of the elevator control device shown in FIG. FIG. 2 is a system diagram showing the control system of In the figure: 1: Three-phase AC power supply 2: Converter 4: Inverter 5: Three-phase induction motor 8: Elevator car 14: Current control circuits 14a to 14c: PWM signals 15 to 17: Current detectors 15a to 17a: Current detection Signal 31: Failure detection circuit 31, a-3]c: Failure detection signal 32: Microcomputer. In addition, in the figures, the same symbol and the same symbol indicate the same or equivalent parts. Agent: Patent attorney: Mr. Masuo and 2 others

Claims (1)

[Scope of Claims] Car drive means having a three-phase induction motor for moving an elevator car; current detection means for detecting the current of the three-phase induction motor; and current detection means for detecting the current of the three-phase induction motor using the output of the current detection means. control calculation means for performing control calculations on the current supplied to the induction motor; failure detection means for detecting a failure of the current detection means; and when the failure detection means detects a failure of the current detection means, a failure is detected. 1. A control device for an elevator, comprising: a control calculation means for use in the event of a failure, which performs control calculation of a current supplied to a three-phase induction motor using a detected current of a phase other than the phase.