JPH0780647B2 - Elevator stop control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an elevator stop control device, and in particular,
The present invention relates to an elevator stop control device having a structure in which an elevator brake device is rotationally elastically supported with respect to a hoisting machine.

[Prior Art] As a conventional technology relating to elevator stop control, for example, the technologies described in JP-A-59-212372 and JP-A-59-203077 are known.

This prior art, when the elevator is stopped, by controlling the speed of the electric motor, brake control of the elevator to zero speed,
After that, power supply to the brake is cut off, the elevator is mechanically locked in a stopped state, and then the control signals to the speed control system and the main circuit elements are cut off.

Further, as a brake device for an elevator, a structure which is elastically supported by a hoisting machine has recently been proposed, for example, in Japanese Patent Application No. 63-63341.

[Problems to be Solved by the Invention] The stop control technique according to the conventional technique as described above can be applied to an elevator using a brake configured to rotationally elastically support the hoisting machine. in this case,
In the elevator device configured by this, the unbalance torque applied to the brake is generated when the control signal to the main circuit element is interrupted, and at this time, the brake is
Due to the rotational elastic displacement, a phenomenon of rocking occurs although it is slight.

In this elevator device, when the above-mentioned brake swing speed is high, the shock is transmitted to the car, a stop shock is generated in the car, and the backlash noise of the hoisting machine gear increases. There is a problem.

An object of the present invention is to solve the above-mentioned problems of the prior art and to reduce the shock of the car at the time of stop in an elevator using a brake having a structure in which the hoisting machine is rotationally elastically supported. It is an object of the present invention to provide an elevator stop control device capable of reducing the backlash noise of gears.

[Means for Solving the Problem] The present invention is provided with means for gradually reducing the torque generated by the electric motor in a state where the brake device is in a braking state after the elevator is decelerated and stopped by the speed control system to zero speed. Is characterized by.

[Operation] When the elevator car is decelerated and stopped, the speed control system stops the braking by the electric motor torque. In this state, the power supply to the brake device is cut off, the brake device is brought into the braking state, and the elevator drive system is stopped. Hold hold. At this time, the speed control system is in the operating state, and the electric motor is generating a predetermined torque so as to stop the car at zero speed.Therefore, the unbalance torque of the elevator is still applied to the braking device. Not not.

In this state, the torque generated by the electric motor is gradually reduced.

With this structure, the unbalance torque of the elevator is gradually applied to the brake device. Therefore, even if the brake device is elastically supported in a swingable manner, it is possible to cause a shock to the car. Moreover, the backlash noise of the gear of the hoisting machine is not increased.

[Embodiment] An embodiment of an elevator stop control device according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a front view showing the configuration of a brake device, FIG. 3 is a side view showing the configuration of the brake device, and FIG. 7 is a time chart illustrating the operation of the embodiment. 1 to 3, 1 is a car, 2 is a counterweight, 3 is a rope, 4 is a sheave, 5 is a hoisting machine, 6 is an electric motor, 7 is an inverter device, 9 is a braking device, and 10 is a decelerating device. Adjuster, 11
Is a torque command gradual reduction circuit, 12 is a current command unit, 13 is a current adjusting unit, 14 is a base drive circuit, 911 is a hoisting machine shaft, 914
Is a brake disc, 921 and 922 are coils, and 925 to 927 are elastic bodies.

In the configuration of the embodiment of the present invention shown in FIG. 1, the elevator car 1 and the counterweight 2 are connected by a rope 3 and are hung from the sheave 4 in a slippery shape.
The sheave 4 is a 3 for driving an elevator via the hoist 5.
It is coupled to the phase induction motor 6.

The electric motor 6 is drive-controlled by an inverter device 7 which is a main circuit, and the inverter device 7 is a base drive circuit.
The internal switching element is controlled by the base signal (control signal) from 14. The base drive circuit 14 is normally controlled by a speed control system including a speed control unit 10, a current command unit 12 and a current adjusting unit 13, and is provided by the present invention in the case of elevator stop control. It is controlled by a speed control system that also includes a torque command gradual reduction circuit 11.

When a call is issued to this elevator device, a speed command V * is generated, drive control for the electric motor 6 is started, and the speed signal V from the speed detector ENC directly connected to the shaft of the electric motor 6 and the speed command The value V * is compared.

When operating the elevator according to this speed command V *, the contact point AS by the permission signal that enables the speed control system
Since R is closed, the speed adjusting unit 10 calculates the torque command τ * for the electric motor 6 based on the difference signal between the speed signal V obtained by the comparison and the speed command V *. This torque command τ * is given to the current command unit 12, and is converted by the current command unit 2 into a current command i * of the electric motor which matches the torque command τ *, and is input to the current adjusting unit 13.

On the other hand, the current i of the electric motor 6 is detected by the current detector CT and applied to the current adjusting unit 13. The current adjusting unit 13 calculates a control signal given to the base drive circuit 14 based on the input current command i * and the motor current i so that the motor current i follows the current command i *, and the main circuit The pulse signal is generated as a control base signal for the inverter device 7. This pulse signal is amplified by the base drive circuit 14 and used as a base signal for the switching element of the inverter device 7 as a base drive circuit.
It is given to the inverter device 7 from 14.

In the present invention, a disc brake device 9 is used as a brake device that mechanically holds the elevator in a stopped state. The disc brake 9 is an elevator such as a sheave 4, a hoisting machine 5 including a speed reducer, and an electric motor 6. The rotary body 91 is connected to a drive system, and a holding portion 92 that holds the rotary body 91 stationary by holding the rotary body 91. The holding portion 92 is elastically supported on the machine room structure by elastic bodies 925, 926 and the like. When the brake signal 15 is applied to the disc brake device 9, the holding portion 92
When the rotating body 91 is rotatably released and the brake signal 15 is cut off, the holding portion 92 brakes the rotating body 91 and holds it in a stationary state.

Next, the operation when the speed of the elevator is controlled according to the speed command V * and stops at the destination floor will be described.

When the elevator car 1 stops landing on the destination floor by the speed control system, the speed command V * becomes almost zero speed command, and the speed of the elevator car becomes almost zero by the speed control system. , Stop electrically controlled. At this time, the brake signal 15 is opened, the power supply to the disc brake device 9 is cut off, and the disc brake 9 is controlled to the braking state. That is, the unbalanced torques of the elevator car 1 and the counterweight 2 and the car 1 and the counterweight 2 that are arranged in a rope shape via the hoisting machine 5 are held stationary, and Brake device 9 that is elastically supported by rotation and swings in the rotation direction, and an electric motor 6 that drives an elevator.
And a speed control system V *, ENC, V, A for controlling the speed of the electric motor 6.
Control device 12, SR, 10 including CT, 13, 14, 14 and the car 1 by the speed control system when the elevator is decelerated and stopped.
And a means for putting the brake device into a braking state when the speed is set to zero speed.

By the way, in this state, the speed control permission signal ASR is still turned on, and the electric motor 6 is generating a predetermined torque in accordance with a predetermined torque command τ * which is an output of the speed adjusting unit 10. , The unbalanced torque of the elevator is not applied.

Then, in this state, the soft stop signal ST that shuts off the speed control permission signal ASR and closes for a predetermined time
Throw in. Then, immediately before the speed permission signal ASR is cut off, the torque designation τ * output from the speed adjustment unit 10 is output.
After the speed permission signal ASR is cut off, the torque command gradual reduction circuit 11 is connected via the contact ST by the soft stop signal.
Is supplied to the current command unit 12 after being converted into a torque command that is gradually reduced through the circuit 11. As described above, the means ST and 11 for gradually reducing the torque generated by the brake 6 in the braking state by the brake device 9 are provided.

The torque command gradual reduction circuit 11 gradually reduces the applied torque command τ * based on a first-order lag function, a ramp function, or stepwise.

Then, after a predetermined time, the signal for cutting off the base signal to the inverter device 7 is cut off to cut off the contact 16, and the pulse signal given from the current adjusting unit 13 to the base drive circuit 14 is cut off. Therefore, it is provided with means for cutting off the control signal given from the control device to the main circuit after a predetermined time has elapsed from the operation of the means for putting the brake device 9 into the braking state. In this case, the base drive circuit 14
It goes without saying that the output of may be cut off.

As a result, the disc brake device 9 is brought into a braking state,
While the soft stop signal is closed for a predetermined time, the torque command or the current command to the electric motor 6 is gradually decreased by the action of the gradual reduction circuit 11, and the generated torque of the electric motor 6 is
It will decrease gradually.

Therefore, the unbalance torque of the elevator is gradually applied to the disc brake 9, and the elastic bodies 925 and 926 of the disc brake 9 are gradually rotationally elastically displaced to cause the stop shock of the elevator car. It is possible to reduce the occurrence of the backlash noise of the gear of the hoisting machine 5.

In the above-described embodiment of the present invention, the torque command gradual reduction circuit 11 that gradually reduces the torque command τ * that is the output of the speed adjusting unit 10 is used in order to gradually reduce the output torque of the elevator driving electric motor. In the present invention, even if the gradual reduction circuit for the current command i * which is the output of the current command unit 12 is provided in the subsequent stage of the current command unit 12, the elevator stop control can be performed in the same manner as described above.

Next, the brake device used in the present invention will be described with reference to FIGS.

The brake device basically includes a rotating body 91 that is connected to a rotating shaft of an elevator drive system to rotate, and a holding section 92 that brakes the rotating body 91 and holds it stationary.

The rotating body 91 is a brake disc having a lining 913 attached to the hoisting machine shaft 911 by a spline 912. On the other hand, the holding portion 92 of the brake device is configured by incorporating coils 921 and 922, a spring 923, a movable member 924, and the like that form a known disc brake. The entire holding portion 92 is coupled to the member 51 fixed to the hoisting machine 5 including the speed reducer via elastic bodies 925 to 927 such as rubber and rotationally displaced by a slight angle. It is possible.

The disk type electromagnetic brake 9 configured as described above is
While the elevator is stopped, the movable member 924 is pressed by the spring 923, the disc 914 and the riming 913 are sandwiched, and the frictional force with the lining 913 overcomes the unbalanced torque of the elevator to stop the elevator drive system. Hold. At this time, the brake device 9 has its holding portion.
Since 92 is elastically supported by the hoisting machine 5, the holding portion 92 is displaced in the rotation direction of the brake shaft while the brake is operating.

When starting the operation of the elevator, the brake signal 15 described with reference to FIG.
22 may be excited, the movable member 924 may be attracted, and the disc 914 may be rotatably released.

FIG. 4 shows the operation of the above-described embodiment of the present invention as a time chart, which will be described below.

When starting the operation of the elevator, first, a torque command is given at time t _{0, and} at the same time, a base signal is given to the main circuit. After that, at time t ₁ , the speed control permission signal ASR is closed and the brake signal 15 is closed to release the braking of the brake device. This causes the elevator to start operating. After that, the operation of the elevator by the speed control system is performed as in the case of the conventional technique.

In time t _2, the the elevator car by a speed control system is stopped becomes zero velocity, at time t _3, the brake signal 15 is shut off, the brake device is in the braking state.
Further, thereafter, at time t ₄ , the speed control permission signal ASR is cut off, and at the same time, the soft stop signal ST is closed for a predetermined time T ₁ . During this predetermined time T ₁ , as already explained, the torque command gradually decreases, the unbalance torque of the elevator is gradually applied to the braking device, and after the predetermined time T ₁ , the base circuit for the main circuit is increased. Even if the signal is cut off, a stop shock is not generated in the car, and the backlash noise of the gear of the hoisting machine can be reduced.

Aforementioned blocks the brake signal 15, the time t ₃ when setting the brake to the braking state, it is sufficient between times t ₂ and t _4.

FIG. 5 is a time chart showing the operation of another embodiment of the present invention including a gradual reduction circuit for the current command.
In the example of the figure, the breaking of the brake signal 15 and the breaking of the speed control permission signal ASR are performed at the same time, and the T ₁ current command is reduced for a predetermined time thereafter, but the same operation as in the example of FIG. 4 is performed. be able to.

According to the above-described embodiment of the present invention, in an elevator using a brake configured to rotationally and elastically support a hoisting machine, shock of a car when stopped is reduced, and backlash of a hoisting machine gear is reduced. The sound can be reduced.

As described above, according to the present invention, after the elevator is decelerated and stopped, the unbalance torque of the elevator is gradually applied to the brake device elastically supported so as to be swingable. It is possible to reduce the backlash noise of the gear of the hoisting machine without generating the noise.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a front view showing the configuration of a brake device, FIG. 3 is a side view showing the configuration of the brake device, FIG. 4, FIG. 3 is a time chart explaining the operation of the embodiment of the present invention. 1 …… car, 2 …… balance weight, 3 …… rope,
4 ... sheave, 5 ... hoisting machine, 6 ... electric motor, 7 ... inverter device, 9 ... braking device, 10 ... speed adjusting unit,
11 …… Torque command gradual reduction circuit, 12 …… Current command section, 13
...... Current regulator, 14 ...... Base drive circuit, 911 ......
Hoisting axle, 914 …… Brake disc, 921,922 …… Coil, 925-927 …… Elastic body.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideaki Takahashi 1070 Ige, Katsuta, Ibaraki Prefecture Mito Plant, Hitachi, Ltd. (56) References Japanese Patent Laid-Open No. 51-23930 (JP, A) 52665 (JP, U) Actually opened 58-102564 (JP, U)

Claims (4)

[Claims] Claim: What is claimed is: 1. An elevator car and a counterweight, which are arranged in a slipping manner via a hoisting machine, and an unbalanced torque between the car and the counterweight are held statically, and the elastic elasticity of the hoisting machine is maintained. Supported,
A braking device structured to swing in the rotational direction, an electric motor for driving an elevator, a control device including a speed control system for speed controlling the electric motor, and a speed control system for controlling the speed of a car when the elevator is decelerated and stopped. An elevator apparatus comprising: a unit that puts the brake device into a braking state when the speed is set to zero; and a unit that gradually reduces a torque generated by the electric motor in a braking state by the brake device. Elevator stop control device. 2. The means for gradually reducing the torque generated by the electric motor comprises means for gradually reducing the torque command signal or the current command signal in accordance with a first-order lag function or a ramp function. The elevator stop control device according to item 1. 3. The means for gradually reducing the torque generated by the electric motor comprises means for gradually reducing the torque command signal or the current command signal in steps of a plurality of stages. The stop control device for an elevator according to the item. 4. A device further comprising means for cutting off a control signal given from the control device to the main circuit after a predetermined time has elapsed from the operation of the means for putting the brake device into a braking state. The elevator stop control device according to claim 1, 2, or 3.