JPH0977411A - Linear motor type elevator control device - Google Patents

Abstract

(57) [Summary] [Purpose] In a linear motor type elevator, it should be able to operate when the speed detector is broken or due to incorrect wiring at the elevator construction stage. In an elevator including an elevator lift body driven by a linear motor, speed detection means mounted on the lift body, and vector control means for performing speed feedback control by the output of the speed detection means, failure detection means or manual operation of the speed detection means The linear motor is controlled in open loop by the permission signal from the operation. [Effect] When the speed detector fails, passengers can be quickly rescued, and even when wiring is incorrect, operation can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator using a linear motor, particularly when the speed detecting means fails,
The present invention relates to an elevator control device suitable for elevator installation work.

[0002]

2. Description of the Related Art As an elevator using a linear motor, for example, as disclosed in JP-A-63-117884, an encoder serving as a speed detecting means is mounted on a counterweight.

[0003]

SUMMARY OF THE INVENTION The prior art described above confine passengers when the encoder fails and the elevator stops. In addition, there is a possibility that the encoder wiring may be disabled at the elevator construction stage and the elevator construction operation may be hindered.

[0004]

According to one aspect of the present invention, there is provided an elevator for raising and lowering in an elevator hoistway, a primary winding and a secondary conductor installed between the elevator and the hoistway. In a linear motor type elevator having a linear motor, a speed detecting means mounted on the lifting body, and a vector controlling means for feeding back an output of the speed detecting means to control the linear motor, a failure of the speed detecting means is detected. And a means for switching from the speed feedback control means to the open loop control means in response to the output of the failure detection means.

Another aspect of the present invention is characterized by comprising a manual operation means for switching from the speed feedback control means to an open loop control means.

According to a preferred embodiment of the present invention, the open loop control means is configured to generate a control output for operating the elevator at a low speed.

Further, according to a preferred embodiment of the present invention, the open loop control means is configured to operate the elevator by invalidating the vector control.

[0008]

The thrust is controlled by supplying power to the linear motor, which is controlled by the well-known vector control inverter control device, and the elevator speed is controlled. In order to perform this speed control, a speed detecting means is installed on the lifting body. If the speed detecting means fails for some reason, the speed feedback control is stopped by the operation of the failure detecting means, and the elevator can be driven to the nearest floor at a low speed in a so-called open loop to promptly rescue passengers.

As a method of switching to the open loop, it is possible to drive the linear motor at a certain slip frequency by invalidating the speed feedback signal, and there is also a method of controlling with an alternating current having a preset frequency.

[0010]

FIG. 1 shows an embodiment of the present invention. A rope type linear elevator is shown, in which a car 1 and a counterweight 3 are connected by a rope 2 and arranged in a slippery shape. The linear motor that drives the elevator is configured as follows. The primary winding 4 of the linear motor is mounted on the counterweight 3, and the secondary conductor 5 is fixedly installed in the hoistway. Only two primary windings and secondary conductors
A gap of about mm is held and electromagnetically coupled with the primary winding to generate thrust. This linear motor may be a well-known cylindrical shape or a flat shape. The control device 10 for controlling the linear motor may be installed in the hoistway or may be near the hall. The control device 10 includes a well-known inverter device 15 and is controlled by a microcomputer.

When an elevator operation command is issued,
Electric power is supplied to the primary winding 4 of the linear motor from a control device 10 including a well-known inverter, and a current flows through the secondary conductor 5 due to the electromagnetic interaction thereof to generate thrust,
Counterweight 3 and car 1 move up and down.
A speed detector 6 is installed on the counter weight 3 to feed back the speed of the linear motor to the control device 10. The control device 10 has the following configuration. When an elevator call is issued, a predetermined speed command is output from the elevator speed command generator 11. The speed signal of the encoder (speed detector) 6, which is a speed detector, is negatively fed back, and the speed adjuster (ASR) 12 outputs a thrust command so that the actual speed follows the speed pattern. The speed regulator 12 is composed of well-known proportional integral, and can be realized by software processing of a microcomputer recently. Speed regulator (ASR)
The output of 12 is input to the vector control means 14 as a thrust command τ * via a limiter circuit 13 which makes the value below a preset value. The vector control means 14 outputs an AC current command capable of controlling the speed of the linear motor with a predetermined thrust, and a current feedback control (not shown) and a pulse width modulation circuit (not shown), a pulse amplification circuit (not shown), a transistor, etc. Is input to the inverter device 15 including a switching element represented by. The output of the inverter device 15 is a predetermined three-phase alternating current, which is fed to the primary winding 3 of the linear motor to generate thrust between the primary winding 3 and the secondary conductor 5 of the linear motor to drive the elevator up and down.

In a normal rope elevator, a hoisting machine, a motor, an encoder that is a speed detector, and a control device are installed in the machine room at the top. I went to the room and could easily replace the encoder. However, since the linear motor type elevator, which is the subject of the present invention, does not have a machine room and the encoder is also installed on a counterweight,
It is necessary to drive the linear motor so that the car 1 and the counterweight 3 are located at substantially the same position by riding on top of the car 1.

Therefore, means 16 for detecting a failure of the speed detector 6 is provided, and the output of the vector control means 14 during normal operation is invalidated by the switching means 162 by this output, so-called open loop which is unrelated to the speed feedback control. The control, that is, the control means 17 for outputting a current command having a frequency corresponding to a certain speed command is switched. When the failure detecting means 16 operates, a low speed speed command is generated from the low speed speed command generating device 111, and the low speed speed command is input to the open loop control means 17 described above to set the inverter frequency ω1 corresponding to the speed command to the switching means 162. It is input to the inverter device 15 via the. The low speed speed command means 111 may be shared with the speed command 11 to input the low speed speed command to the open loop control means 17. The inverter device 15 supplies alternating current power to the primary winding 3 of the linear motor to operate the elevator at a low speed to rescue passengers and replaces the encoder. Maintenance personnel get on the top of the car 1 and are the same as the counterweight 3. Can be moved to a position.

FIG. 2 shows details of a part of the vector control means 14, the open loop control means 17, the switching means 162 and the inverter device 15 of FIG. The vector control means 14 receives the thrust command τ * and calculates the slip frequency ωs corresponding to the thrust command by the calculator K1. The inverter frequency ω1 is calculated by adding the speed feedback signal ωr from the encoder. Further, the current command It for the thrust component is calculated via the calculator K2, and the preset exciting current I
A vector operation is performed from m to calculate a primary current value I1 and further a phase θ. This three-phase AC current command from ω1, I1, θ is input to the arithmetic means 141. And
The three-phase AC current commands Iu, Iv, and Iw are input to the inverter device 15 for current feedback control.

When the speed detector 6 fails, the failure detecting means 16 invalidates the signal of the vector control means 14 by the switching means 162, and the open loop control means 17 and the inverter device 15 are connected. The open loop control means 17 transmits to the inverter device 15 the inverter frequency ω1 and the primary current command I1 that match the low speed command. In this way, the inverter device 15 can operate the elevator at a low speed in an open loop without using the speed signal of the encoder (speed detector) 6.

FIG. 3 shows a modified embodiment of FIG. When the encoder (speed detector) 6 fails, the switching unit 163 disables the speed adjuster 12 according to the signal from the failure detecting unit 16. That is, a thrust detector τ * is output from a predetermined thrust command generator 18 by a load detector (not shown) in the car 1, the vector control means 14 calculates a certain slip frequency ωs, and an encoder (speed detector). Since the output of 6 is invalid, ω in FIG.
r = 0 and the inverter frequency command ω1 becomes equal to ωs. Since the slip frequency is usually a value at which the elevator is operated at a low speed, the elevator can be operated at a low speed as described above.

FIG. 4 shows another embodiment of the invention, in which the failure detection means 16 of the encoder switches the speed signal itself to the switching means 161.
It was made invalid by. Also in this case, the inverter frequency ω1 becomes the slip frequency ωs and the low speed operation becomes possible as in the case of FIG.

FIGS. 5 to 7 are shown in FIGS. 1, 3 and 4, respectively.
This is a modified example.

A forced operation permission signal 20 is generated by operating means installed inside or outside the control device. For example, at the time of trial operation of elevator construction, when the speed detection is not working due to incorrect wiring of the encoder (speed detector) 6,
In FIG. 5, the switching signal 201 for permitting forced operation, the switching signal 202 in FIG. 6, and the switching signal 203 in FIG.
Therefore, the elevator can be operated at a low speed by the method, means and principle described in FIG.

FIG. 8 shows another embodiment in which the structure of the linear motor is different from that of FIG.
To FIG. 2, FIG. 3, FIG. 5, FIG. 6 and FIG.

That is, FIG. 8 shows a so-called low-press linear motor type elevator, in which the primary motor windings 4a and 4b of the linear motor are installed in the elevator hoistway 9 and the secondary conductor 5a, 5b is installed, and a speed detector 6 is further installed. The operation when the encoder (speed detector) 6 fails is similar to that described in FIG.

[0022]

According to the present invention, in the event of an encoder failure, passengers can be promptly rescued and restored, and erroneous wiring during elevator construction can be prepared.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention.

FIG. 2 is a detailed block diagram of FIG. 1;

FIG. 3 shows another embodiment.

FIG. 4 shows another embodiment.

FIG. 5 shows another embodiment.

FIG. 6 shows another embodiment.

FIG. 7 shows another embodiment.

FIG. 8 shows another embodiment.

[Explanation of symbols]

1 ... Elevator car, 2 ... Rope, 3 ... Counterweight, 4 ... Linear motor primary winding, 5 ... Linear motor secondary conductor, 6 ... Encoder (speed detector), 1
6 ... Failure detection means of speed detector, 17 ... Open loop control means, 20 ... Forced operation permission signal, 161, 162
163 ... Switching means, 201, 202, 203 ... Operation means for generation.

Front page continuation (72) Inventor Hiroshi Nagase 1070 Imo, Hitachinaka City, Ibaraki Hitachi Ltd. Mito Plant (72) Inventor Teruka Atsawa 1-6 Kandanishikicho, Chiyoda-ku, Tokyo Hitachi Building Systems Co., Ltd. In service

Claims (4)

[Claims] 1. An elevating body for moving up and down in a hoistway of an elevator, and a primary winding and a second winding installed between the hoistway and the hoistway.
A linear motor type elevator having a linear motor having a secondary conductor, a speed detecting means mounted on the lifting body, and a vector controlling means for feeding back an output of the speed detecting means to control the linear motor. And a means for switching from the speed feedback control means to the open loop control means in response to the output of the failure detection means. 2. An elevating body for moving up and down in a hoistway of an elevator, a primary winding and a second winding installed between the hoistway and the hoistway.
A linear motor type elevator having a linear motor having a secondary conductor, a speed detecting means mounted on the lifting body, and a vector controlling means for feeding back an output of the speed detecting means to control the linear motor. A linear motor type elevator control device comprising: a manual operation means for switching from the control means to the open loop control means. 3. The control device for a linear motor type elevator according to claim 1, wherein the open loop control means is configured to generate a control output for operating the elevator at a low speed. 4. The control device for a linear motor type elevator according to claim 1, wherein the open loop control means is configured to operate the elevator by invalidating the vector control.