JPH05155551A - Controller of hydraulic elevator - Google Patents

Abstract

PURPOSE:To hold a cage of a hydraulic elevator in a safe, stationary state even if a solenoid value becomes inoperative due to blockage. CONSTITUTION:An induction motor 10 is subjected to variable speed control through the output of an inverter 23 and a hydraulic pump 9 is driven and pressure oil is fed to a cylinder 1 during up-operation of an elevator, whereas during down-operation of the elevator the motor 10 is subjected to regenerative braking by the amount of oil returning to an oil tank 13 so as to lower a cage 6. After the cage 6 stops at a floor, only a current for excitation is passed through the motor 10 to stop a speed controller 27 while the current for torque is not passed. If the blocked inoperative state of a solenoid valve 7 is detected by a solenoid valve abnormality detector 35, the current for torque is passed again to generate braking torque.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling a hydraulic elevator in which a hydraulic pump is driven by a variable speed electric motor.

[0002]

2. Description of the Related Art Conventionally, in a hydraulic elevator, an electric motor is rotated at a constant speed during an ascending operation, and a fixed amount of oil discharged from a hydraulic pump is adjusted by a flow control valve. By doing so, the speed of the car is controlled. Also, due to the weight of the car during the descending operation,
The speed of the car is controlled by adjusting the amount of oil that flows back from the hydraulic jack to the oil tank with the flow control valve. In this method, excess pressure is returned from the oil tank to the oil tank during the ascending operation, resulting in a large energy loss, and during the descending operation, the potential energy is converted into heat, resulting in a large increase in the oil temperature.

On the other hand, FIGS. 4 and 5 are diagrams showing a control device for a hydraulic elevator disclosed in, for example, Japanese Patent Publication No. Sho 64-311, FIG. 4 is an overall configuration diagram, and FIG. 5 is an operation sequence diagram. is there. This is to variably control the discharge amount of a pump driven by an electric motor by controlling an induction motor with a variable voltage variable frequency (hereinafter referred to as VVVF) using an inverter or the like.

In FIG. 4, (1) is a cylinder embedded in the bottom of the hoistway, (2) is pressure oil filled in the cylinder (1),
(3) is a plunger supported by the pressure oil (2), which constitutes a hydraulic jack. (4) is a deflector wheel provided at the top of the plunger (3), (5) is a main rope fixed to the hoistway and is wound around the deflector wheel (4), and (6) is a main rope (5)
Is a basket that is attached to the other end of.

(7) is an electromagnetic coil that always functions as a check valve.
An electromagnetic valve that is switched when energized (not shown) and conducts in the opposite direction, (8) is a pipe line connected between the cylinder (1) and the electromagnetic valve (7) for sending pressure oil, (9) ) Is a hydraulic pump reversibly operated by the three-phase induction motor (10) and connected to the solenoid valve (7) by the conduit (11), and (12) is connected to the electric motor (10) and the electric motor (10) is connected.
Speed detector, which generates a voltage proportional to the rotation speed of (13)
Is an oil tank that stores oil (14), and a hydraulic pump
It is connected to (9). Reference numeral (16) is a jack side pressure sensor for detecting the pressure in the pipeline (8), and (17) is a pump side pressure sensor for detecting the pressure in the pipeline (11).

(18) is a three-phase AC power supply, (19) is a converter that converts three-phase AC into DC, (20) is a smoothing capacitor that smoothes the output of the converter (19), and (21) is regenerative power. The regenerative resistor to be consumed, (22) is a transistor that conducts in a regenerative state, (23) is an inverter that converts the voltage of the smoothing capacitor (20) into a three-phase alternating current of variable voltage and variable frequency and supplies it to the electric motor (10). Is.

Reference numeral (24) is a pressure balance controller connected to the pressure sensors (16) and (17), (25) is a traveling pattern command, and (26) is a traveling pattern command (25) and a speed detector (12). An adder for adding outputs, (27) is a speed controller to which the output of the adder (26) is supplied,
(28) is a current detector that detects the input current of the motor (10), and (2
Reference numeral 9) is a torque controller that controls the inverter (23) according to each output of the speed detector (12) and the current detector (28).

The conventional hydraulic elevator control device is configured as described above, and includes the traveling pattern command (25) and the speed detector.
The output of (12) is compared by the adder (26), and from the deviation, the speed controller (27) issues a torque command value and the torque controller
Supply to (29). The torque controller (29) controls the inverter (23) according to the torque command value, and the electric motor (10) is VVV.
F controlled.

FIG. 5 shows the operation of the VVVF controlled hydraulic elevator from start to stop. In the figure, S ₆ is a basket
The speed of (6) (the subscript 6 of the code indicates the code of the car (6). The same applies hereinafter), S ₁₀ is the speed of the electric motor (10), P ₁₆ is the jack side pressure, P ₁₇ is the hydraulic pump side pressure, T ₇ is the opening period of the solenoid valve (7), T ₂₄ is the operating period of the pressure balance controller (24), T ₂₇ is the operating period of the speed controller (27), T ₂₉ is the torque controller (29) and inverter The operation period of (23) is shown.

At the time of starting, the output of the jack side pressure sensor (16) and the output of the pump side pressure sensor (17) are detected, and the pressure P ₁₆
After controlling the electric motor (10) by the pressure balance controller (24) so that the pressure P ₁₇ and the pressure P ₁₇ coincide with each other, the coil of the solenoid valve (7) is energized and the pipes (8) and (11) are conducted. It The electric motor (10) is controlled at a variable speed by the traveling pattern command (25),
(6) runs.

When the car (6) lands on the floor, the coil of the solenoid valve (7) is deenergized, thereby functioning as a check valve, and the pressure oil (2) is the hydraulic jack (1). ~ (3) from oil tank
It does not flow back into (13) and the car (6) remains stationary. afterwards,
The operation of the inverter (23) stops and the electric motor (10) stops.

In this system, only the required amount of oil is sent to the hydraulic jack in response to the speed command value during the ascending operation, and the amount of oil recirculated to the oil tank (13) during the descending operation depends on the electric motor (10).
Since it regeneratively brakes, it consumes less energy, keeps the rise in oil temperature low, and is a highly efficient hydraulic elevator. In this VVVF controlled hydraulic elevator,
The solenoid valve (7) may be as simple as simply opening and closing the flow path of pressure oil.

[0013]

As described above, in the conventional hydraulic elevator control device, the electric motor (10) is controlled at a variable speed to drive the hydraulic pump (9) to move the car (6) up and down to move the car. At the time of landing of (6), the passage of the pressure oil (2) was blocked by the solenoid valve (7), so if the solenoid valve (7) could not be blocked due to mechanical malfunction, etc. The following situations occur.

That is, when the flow passage cannot be closed, the oil flows back from the hydraulic jacks (1) to (3) to the oil tank (13) due to the weight of the car (6), and the car (6) is at the bottom floor. Descend to. At this time, when the electric motor (10) is started to brake the car (6), the electric motor (10) is being reversed by the oil (14) flowing back to the oil tank (13), and the electric motor (10). Becomes unstable because it is not excited, and there is a problem that an excessively large current flows transiently.

The present invention has been made in order to solve the above problems, and it is possible to stably restart the electric motor and brake the car even when the solenoid valve cannot be closed. An object is to provide a control device for a hydraulic elevator.

[0016]

A control device for a hydraulic elevator according to a first aspect of the present invention sends only an exciting current to a motor after landing of a car to prevent the operation of a speed controller for a certain period of time. When an abnormality of the solenoid valve is detected, the speed controller is restarted.

Also, in the control device for the hydraulic elevator according to the second invention, in the first invention, when the speed controller is restarted, the gain of the speed controller is increased from zero to a normal value in a predetermined time. It was done like this.

A control device for a hydraulic elevator according to a third aspect of the present invention is the control device for a hydraulic elevator according to the first aspect, which detects pressures on the hydraulic pump side and the hydraulic jack side of the solenoid valve and balances the two pressures before starting. The balance command value is calculated, stored, and used as the pressure balance command value when the speed controller is restarted.

Also, in the hydraulic elevator control device according to the fourth aspect of the present invention, in the third aspect of the present invention, when the speed controller is restarted, the pressure balance command value is increased from zero to a stored value in a predetermined time. It was done.

[0020]

In the first aspect of the present invention, after the car is landed on the car, only the exciting current is passed through the electric motor and the torque current is not passed, and when the solenoid valve cannot be closed, the torque current is passed again. The braking torque required by the speed controller is instantly generated.

Further, in the second aspect of the present invention, when the current for the torque is supplied again, the gain of the speed controller is gradually increased, so that the braking torque is smoothly increased.

Further, in the third aspect of the invention, the pressure balance command value for balancing the pressures on both sides of the solenoid valve is calculated and stored before starting, and this is used as the pressure balance command value for flowing the torque current again. , Regardless of the operation of the solenoid valve, the car stands still with the torque of the electric motor.

Further, in the fourth aspect of the invention, the pressure equilibrium command value is gradually increased when the current for the torque is supplied again, so that the hydraulic pump side pressure rises smoothly.

[0024]

1 and 2 are views showing an embodiment of the present invention. FIG. 1 is an overall configuration diagram, FIG. 2 is an operation sequence diagram, and FIG.
[FIG. 6] is an operation sequence diagram when a solenoid valve is abnormal, and portions similar to those in the conventional apparatus are denoted by the same reference numerals.

In FIG. 1, reference numeral (35) is a solenoid valve abnormality detector for detecting that the solenoid valve (7) does not block the flow path of the pressure oil (2) even when the coil of the solenoid valve (7) is deenergized. , (36) is a storage device for storing the output of the pressure balance controller (24), and (37) is the speed controller (2
It is a gain controller that controls the gain of 7).

As shown in FIG. 2, the control device for the hydraulic elevator constructed as described above is the same as the conventional device from startup to landing. After the car (6) has landed, the coil of the solenoid valve (7) is deenergized and the output of the speed controller (27) is made zero. As a result, no torque command value is given to the torque controller (29), and the torque current applied to the electric motor (10) becomes zero. However, since the operation of the torque controller (29) is continued, the exciting current is supplied to the electric motor (10). solenoid valve
When (7) is normal, the operation of the torque controller (29) is stopped after a predetermined time, and at the same time, the inverter (23) is stopped.

Next, the case where the solenoid valve (7) cannot be closed will be described with reference to FIG. That is, after landing,
Even if the coil of the solenoid valve (7) is deenergized, the solenoid valve (7) cannot be closed due to mechanical malfunction. However, while the speed controller (27) is operating, the car (6) is held by the torque generated by the electric motor (10).

Thereafter, as described above, when the operation of the speed controller (27) is stopped and its output becomes zero, the electric motor (10) does not generate torque and the car (6) descends due to its own weight. At this time, the electric motor (10) is reversely rotated by the oil (14) which flows back from the cylinder (1) to the oil tank (13). However, since the exciting current is electrically flowing continuously, it is in a stable state.

On the other hand, when the solenoid valve (7) cannot be closed, the solenoid valve abnormality detector (35) detects this and outputs the output to the speed controller (27), gain controller (37) and torque controller. Send to (29). The speed controller (27) is now restarted and the speed controller (2
7) controls the speed of the electric motor (10) according to the speed command value (= 0). Since the exciting current flows through the electric motor (10), the torque required by the speed controller (27) can be instantly generated. As a result, the car (6) is braked by the torque generated by the electric motor (10) from the free fall state, so that the car (6) can be moved to the stationary state.

When the speed controller (27) restarts,
The gain G ₃₇ is increased by a gain controller (37) from zero to a normal value in a predetermined time as shown in FIG. 3, so that the car (6)
The impact when braking is reduced. Speed controller (27)
The moment when starts re-operation is when the deviation between the speed command value (= 0) and the speed of the electric motor (10) is the maximum, and at this time the gain of the speed controller (27) is a normal value. , Speed controller (2
7) The torque command value output by
(10) suddenly generates an extremely large braking torque,
An extremely large impact will be applied to the car (6).

However, if the gain G ₃₇ of the speed controller (27) has a small value when the speed controller (27) starts the re-operation, the torque command value does not become so large. However, since the speed controller (27) is not stopped, a certain braking force acts on the car (6). After that, as the gain G _{37 of} the speed controller (27) increases, the braking torque generated by the electric motor (10) increases, and the car (6) smoothly shifts to a stationary state.

Also, after the car (6) has landed, the speed controller
At the same time as the operation of (27) is stopped, the pressure equilibrium command value calculated at the time of startup is stored in the storage device (36). And
At the same time that the solenoid valve abnormality detector (35) operates and the speed controller (27) restarts, the pressure equilibrium command value P ₂₄ stored in the storage device (36) gives a command to the speed controller (27). Given as a value. In this way, it becomes possible to control the car (6) to a stationary state even earlier.

The pressure balance command value P ₂₄ also increases from zero to the specified value stored in the storage device (36) in a predetermined time, so that the shock in the car (6) is alleviated.

[0034]

As described above, according to the first aspect of the present invention, after the car is landed, only the exciting current is passed through the electric motor and the torque current is not passed. Since the current is made to flow, the braking torque required by the speed controller is instantaneously generated, and there is an effect that the car can be safely braked even when the electromagnetic valve cannot be closed.

In the second aspect of the invention, when the current for the torque is supplied again, the gain of the speed controller is gradually increased. Therefore, the braking torque is smoothly increased, and the car can be smoothly moved to the stationary state. There is an effect that can be done.

Further, in the third aspect of the invention, the pressure balance command value for balancing the pressures on both sides of the solenoid valve is calculated and stored before starting, and this is used as the pressure balance command value for flowing the torque current again. The car can be stopped by the torque of the electric motor regardless of the operation of the solenoid valve, and the car can be quickly controlled to be in a stationary state.

Further, in the fourth aspect of the invention, when the current for the torque is supplied again, the pressure equilibrium command value is gradually increased, so that the pressure on the hydraulic pump side smoothly rises and the impact in the car can be alleviated. There is an effect that can be done.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing Examples 1 to 4 of the present invention.

FIG. 2 is an operation sequence diagram of FIG.

3 is an operation sequence diagram when the solenoid valve in FIG. 1 is abnormal.

FIG. 4 is an overall configuration diagram showing a conventional hydraulic elevator control device.

5 is an operation sequence diagram of FIG. 4.

[Explanation of symbols]

 1 hydraulic jack (cylinder) 2 pressure oil 3 hydraulic jack (plunger) 6 car 7 solenoid valve 9 hydraulic pump 10 induction motor 16 jack side pressure sensor 17 pump side pressure sensor 23 inverter 24 pressure balance command value control means (pressure balance controller) ) 27 speed controller 29 torque component current control means (torque controller) 35 solenoid valve abnormality detector 36 memory device 37 gain controller

Claims (4)

[Claims] 1. A hydraulic pump driven by an electric motor,
An electromagnetic valve is installed in the flow path of the pressure oil that connects to the hydraulic jack that raises and lowers the car, and the speed of the car is controlled by the variable speed control of the electric motor by the torque controller that operates according to the torque command value from the speed controller. However, in a hydraulic elevator that controls the passage of the pressure oil by the solenoid valve after landing of the car, it operates when the solenoid valve does not block the passage of pressure oil after landing of the car. The electromagnetic valve abnormality detector and the car after the car is landed, only the exciting current is passed to the motor, and the operation of the speed controller is blocked.When the electromagnetic valve abnormality detector operates, the speed controller is restarted. A control device for a hydraulic elevator, comprising: a torque component current control means for instructing an operation. 2. A hydraulic pump driven by an electric motor,
An electromagnetic valve is installed in the flow path of the pressure oil that connects to the hydraulic jack that raises and lowers the car, and the speed of the car is controlled by the variable speed control of the electric motor by the torque controller that operates according to the torque command value from the speed controller. However, in a hydraulic elevator that controls the passage of the pressure oil by the solenoid valve after landing of the car, it operates when the solenoid valve does not block the passage of pressure oil after landing of the car. The electromagnetic valve abnormality detector and the car after the car is landed, only the exciting current is passed to the motor, and the operation of the speed controller is blocked.When the electromagnetic valve abnormality detector operates, the speed controller is restarted. And a gain controller for increasing the gain of the speed controller from zero to a specified value in a predetermined time when reactivating the speed controller device. hydraulic The control device of the elevators. 3. A hydraulic pump driven by an electric motor,
An electromagnetic valve is installed in the flow path of the pressure oil that connects to the hydraulic jack that raises and lowers the car, and the speed of the car is controlled by the variable speed control of the electric motor by the torque controller that operates according to the torque command value from the speed controller. Then, after landing of the car, the electromagnetic valve controls so as to close the flow path of the pressure oil, and pressure sensors for detecting pressure on both sides of the electromagnetic valve, and the output of both pressure sensors In a hydraulic elevator provided with a pressure balance controller that calculates a pressure balance command value that balances the pressure on both sides of the solenoid valve before starting the car, in the hydraulic elevator after the car is landed, the solenoid valve causes the pressure oil flow path to flow. When the electromagnetic valve abnormality detector that operates when the solenoid valve abnormality detector does not close, and the excitation current only flows to the electric motor after landing the car, the operation of the speed controller is blocked and the electromagnetic valve abnormality detector operates. The torque-division current control means for instructing the re-operation of the speed controller, and the storage device for storing the pressure-balance command value when the electric motor is stopped and providing it as the pressure-balance command value for re-operating the speed controller. A control device for a hydraulic elevator, which is characterized by being provided. 4. A hydraulic pump driven by an electric motor,
An electromagnetic valve is installed in the flow path of the pressure oil that connects to the hydraulic jack that raises and lowers the car, and the speed of the car is controlled by the variable speed control of the electric motor by the torque controller that operates according to the torque command value from the speed controller. Then, after landing of the car, the electromagnetic valve controls so as to close the flow path of the pressure oil, and pressure sensors for detecting pressure on both sides of the electromagnetic valve, and the output of both pressure sensors In a hydraulic elevator provided with a pressure balance controller that calculates a pressure balance command value that balances the pressure on both sides of the solenoid valve before starting the car, in the hydraulic elevator after the car is landed, the solenoid valve causes the pressure oil flow path to flow. When the electromagnetic valve abnormality detector that operates when the solenoid valve abnormality detector does not close, and the excitation current only flows to the electric motor after landing the car, the operation of the speed controller is blocked and the electromagnetic valve abnormality detector operates. And a storage device for storing the pressure balance command value when the electric motor is stopped and giving it as a pressure balance command value when the speed controller is restarted. A control device for a hydraulic elevator, comprising: a pressure equilibrium command value control means for increasing the pressure equilibrium command value given by the storage device from zero to the stored value in a predetermined time.