JP4498730B2 - Elevator abnormal vibration detection device - Google Patents

Description

  The present invention relates to a rope type elevator, and more particularly to an apparatus for detecting abnormal vibration of a car.

FIG. 4 shows an elevator control device using a general permanent magnet synchronous motor (PM motor). In FIG. 4, 1 is a permanent magnet synchronous motor for driving an elevator, 2 is an encoder attached to the permanent magnet synchronous motor 1, and 3 is a current detector for detecting the U phase and V phase of the permanent magnet synchronous motor 1, respectively. There, W-phase current _{i W} is generally detected U-phase, obtained V-phase current _i U, from _{i V} as _{i W = 1-i U -i} V. Reference numeral 4 denotes a speed control device that controls the speed of the elevator based on the A-phase and B-phase pulses from the encoder 2, and includes a speed calculator 4a, a disconnection detector 4b, and a speed controller 4c. Reference numeral 5 denotes a current control device that controls the current of the permanent magnet synchronous motor 1 based on the A-phase, B-phase, and F-phase pulses from the encoder 2 and the output of the speed control device 4, and includes a phase calculator 5a and a current controller. 5b, 3 phase 2 phase converter 5c, 2 phase 3 phase converter 5d.

  In the above configuration, when the output line of the encoder 2 is disconnected while the elevator is running, the disconnection detector 4b that detects disconnection from the amount of change in the A-phase and B-phase pulses of the encoder 2 makes an emergency stop. The elevator will travel to some degree of inertia before it stops completely. However, because the output line of the encoder 2 is disconnected, there is no input to the phase calculator 5a in the current control device 5, so that the phase calculation is stopped and the actual magnetic pole position of the permanent magnet synchronous motor 1 and the current control device 5 are recognized. The position of the magnetic pole to be deviated. Further, since the output line of the F-phase pulse signal is also disconnected at the same time, the deviation of the magnetic pole position cannot be corrected. When the elevator is restarted in this state, the control is disabled due to the deviation of the magnetic pole position, which causes abnormal car vibration. However, since the amount of change of the A-phase and B-phase pulses is originally small immediately after startup and disconnection detection is not performed for a certain period of time in order to prevent malfunction, abnormal vibration cannot be prevented instantaneously.

  As an abnormal vibration detection apparatus for an elevator that solves such a problem, there is an apparatus that is provided with a car load detector, which is a highly accurate weighing apparatus, so that abnormal vibration of the car can be detected (for example, Patent Document 1). reference).

JP 2002-68630 A

  A conventional elevator abnormal vibration detection device requires a high-precision weighing device. Therefore, if a weighing device that can detect only the magnitude from a certain value, such as a contact balance, is applied, it is detected. There is a problem that you can not.

  The present invention has been made to solve the above-described problems. When abnormal vibration occurs, the current control device counts that the deviation of the d-axis current exceeds a certain value, and the number of times is equal to or more than a predetermined value. The present invention provides an abnormal vibration detection device for an elevator that detects abnormal vibration of a car quickly without depending on the accuracy of the scale device by detecting it as abnormal vibration at the time.

In the elevator abnormal vibration detecting apparatus according to the present invention, a permanent magnet synchronous motor for driving the elevator, and an A-phase and B-phase pulse signal for detecting the rotational position and speed of the motor attached to the permanent magnet synchronous motor. an encoder for generating the F-phase pulse signal for detecting the magnetic pole position of the permanent magnet synchronous motor and, attached to the power lines of the permanent magnet synchronous motor, U-phase permanent magnet synchronous motor to detect the V-phase current A current detector, a speed control device that controls the speed of the permanent magnet synchronous motor based on the A-phase and B-phase pulse signals from the encoder, and a break that is provided in the speed control device and detects a break in the output line of the encoder a detector converts the 3-phase alternating current detected from the current detector into a d-axis current and q-axis current, and a current control device for controlling the d-axis current and the q-axis current based on By disconnection detector stops suddenly to detect disconnection of the output line of the encoder, when restarting remains recognizes pole value of the current control device is shifted from the actual value, the elevator becomes d-axis current uncontrollable Abnormal vibration detection device that counts the number of times of abnormal vibration and the d-axis current deviation value of the current control device exceeds a predetermined value, and determines that abnormal vibration has occurred when the number of times exceeds a specified value, and emergency stop the elevator It is equipped with.

  As described above, the present invention can detect abnormal vibrations by using the deviation of the d-axis current during current control that is normally performed, so that it can be quickly performed without using other measuring instruments such as a scale device. Abnormal vibration can be detected, and a safer elevator than ever can be provided.

Embodiment 1 FIG.
1 is a block diagram showing a configuration of an abnormal vibration detection apparatus for an elevator according to Embodiment 1 of the present invention. FIG. 2 is a flowchart for explaining the operation of the abnormal vibration detection apparatus for an elevator according to Embodiment 1 of the present invention. FIG. 3 is a timing chart showing a flow until an abnormal signal is detected by the abnormal vibration detecting apparatus for an elevator according to the first embodiment of the present invention.
In FIG. 1, 1 is a permanent magnet synchronous motor for driving an elevator, 2 is an encoder attached to the permanent magnet synchronous motor 1, and 3 is a current detector for detecting the U phase and V phase of the permanent magnet synchronous motor 1, respectively. There, W-phase current _{i W} is generally detected U-phase, obtained V-phase current _i U, from _{i V} as _{i W = 1-i U -i} V. Reference numeral 4 denotes a speed control device that controls the speed of the elevator based on the A-phase and B-phase pulses from the encoder 2, and includes a speed calculator 4a, a disconnection detector 4b, and a speed controller 4c. Reference numeral 5 denotes a current control device that controls the current of the permanent magnet synchronous motor 1 based on the A-phase, B-phase, and F-phase pulses from the encoder 2 and the output of the speed control device 4, and includes a phase calculator 5a and a current controller. 5b, 3 phase 2 phase converter 5c, 2 phase 3 phase converter 5d. These configurations are the same as the conventional ones.
The abnormal vibration detection device 6 according to the present invention is implemented in the current control device 5 and includes a comparator 6a and a counter 6b. Normally, the current of the permanent magnet synchronous motor 1 is divided into a d-axis current and a q-axis current by a three-phase / two-phase converter 5c, and is controlled by, for example, a d-axis current controller 5e. However, if the output line of the encoder 2 is disconnected and suddenly stops, and the magnetic pole value recognized by the current control device 5 is restarted with a deviation from the actual value, the d-axis current becomes uncontrollable and the elevator is abnormal. Oscillates and the d-axis current oscillates accordingly. Therefore, the absolute value of the deviation of the d-axis current in the current control loop ^_(i d * -i _d), compared by a comparator 6a and certain detection level ^{_{α, | i d * -i d}} |> α The number of times of becoming is counted by the counter 6b. When the counted value exceeds a predetermined value β, it is determined that abnormal vibration has occurred, and an emergency stop command is output to stop the elevator.

FIG. 2 shows a flowchart of the operation. FIG. 3 shows a flow until an abnormal signal is detected. In Figure 2 a flow chart, cnt is | i _d ^* -i _d |> counter for counting the fact that a alpha, Cutflg once to prevent malfunctions | i _d ^* -i _d | after becoming a> alpha is deviation This is a flag for preventing counting again until becomes less than α. In the initial stage of the start, these two values are cleared to 0 in step S1. Then (it is common to 0.) D-axis current command value _i ^d * in step S2 and the absolute value of _{i d} deviation _| ⁱ d * -i _d | and compares the detection level alpha. | _{i ^d} * -i ^d | case of> α, then to confirm the cutflg in step S3. If cutflg = O, the process proceeds to step S4, the counter cnt is incremented by 1, and cutflg = 1 is set. If cutflg = 1 in step S3, the process proceeds to step S5 without advancing the counter cnt. As a result, when | i _d ^* −i _d |> α, it is counted continuously so as not to cause a malfunction. In step S5, the value of the counter cnt is confirmed. If the value is equal to or greater than the prescribed value β, it is determined that there is abnormal vibration, an emergency stop command is output, and the elevator is stopped. If cnt ≦ β, the process returns to step S2 and is repeated thereafter. In step ^{_{S2 | i d * -i d |}} cutflg does not become zero until ≦ alpha (step S6).
FIG. 3 is a timing chart showing the flow until such an abnormal signal is detected.

  With the above configuration, the shaft current during normal current control becomes uncontrollable, and by utilizing the deviation when oscillating, abnormal vibration of the car can be detected without relying on the scale device, so other detection such as a scale device Abnormal vibrations can be detected without relying on equipment.

It is a block diagram which shows the structure of the abnormal vibration detection apparatus of the elevator in Embodiment 1 of this invention. It is a flowchart explaining operation | movement of the abnormal vibration detection apparatus of the elevator in Embodiment 1 of this invention. It is a timing chart which shows the flow until it detects the abnormal signal of the abnormal vibration detection apparatus of the elevator in Embodiment 1 of this invention. It is a block diagram which shows the structure of the abnormal vibration detection apparatus of the conventional elevator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Permanent magnet synchronous motor 2 Encoder 3 Current detector 4 Speed controller 4a Speed calculator 4b Disconnection detector 4c Speed controller 5 Current controller 5a Phase calculator 5b Current controller 5c 3 phase 2 phase converter 5d 2 phase 3 Phase converter 5e d-axis current controller 6 abnormal vibration detector 6a comparator 6b counter

Claims (2)

A permanent magnet synchronous motor for driving the elevator;
An encoder which is attached to the permanent magnet synchronous motor and generates A phase and B phase pulse signals for detecting the rotational position and speed of the motor and an F phase pulse signal for detecting the magnetic pole position of the permanent magnet synchronous motor; ,
Attached to the power line of the permanent magnet synchronous motor, U-phase permanent magnet synchronous motor, a current detector for detecting a V-phase current,
A speed control device for controlling the speed of the permanent magnet synchronous motor based on A-phase and B-phase pulse signals from the encoder;
A disconnection detector provided in the speed control device for detecting disconnection of an output line of the encoder;
A current control device that converts the three-phase alternating current detected by the current detector into a d-axis current and a q-axis current, and performs control based on the d-axis current and the q-axis current;
When the disconnection detector detects the disconnection of the output line of the encoder and suddenly stops, the d-axis current becomes uncontrollable when the magnetic pole value recognized by the current control device is restarted with a deviation from the actual value. Abnormality that causes the elevator to vibrate abnormally , counts the number of times the d-axis current deviation value of the current control device exceeds a predetermined value, and determines that abnormal vibration has occurred when the number of times exceeds the specified value, causing the elevator to stop urgently A vibration detection device;
An abnormal vibration detecting device for an elevator, comprising:   Once the d-axis current deviation value becomes equal to or greater than a predetermined value after the d-axis current deviation value becomes equal to or greater than a predetermined value, the number of times is not counted again even if the d-axis current deviation value becomes equal to or greater than a certain value. 2. The apparatus for detecting abnormal vibration of an elevator according to claim 1, wherein malfunction is prevented.

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