JPH04101978A - Cage position detecting device for elevator - Google Patents

Abstract

PURPOSE:To detect the stop position of a cage accurately by maintaining the cage position detecting function of a cage position detecting device in the operated state even after normal power supply cutoff. CONSTITUTION:After the operation of an emergency stop mode is started at a time T1, a cage is stopped at a time T2. Meanwhile, a condenser 20 continues its discharge at a time T3 until the volume becomes practically zero. The supply of an operating current to a cage position detecting device 30 is therefore continued during the discharge time of the condenser 20 from the time T1 to the time T3. On the other hand, the cage position detecting device 30 detects power failure by the change of an input level from a switch 32 at the time T1 and switches its action mode from a normal mode to an emergency stop mode. As a result, the inertial travel distance of a cage from the time T1 to the time T2 is detected by the count of pulse signals TG, and the cage position at the time T2 is stored as cage position data DP into a storage device 36.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an elevator position detection device, and in particular, when the power supply to the elevator drive device is cut off due to a power outage, etc., the car comes to an emergency stop. The present invention relates to an elevator car position detecting device that can accurately detect the position of the car when the car is in use, and can smoothly resume operation of the elevator after power supply is restored.

[Prior Art] As is well known, the elevator car position is constantly monitored by a car position detection device, and the elevator control device receives this car position detection signal and input via a control panel inside the car. The acceleration/deceleration, running direction, etc. of the car are controlled in response to the car call that specifies the destination floor and the hall call that is input via the control panel of each floor. That is, if accurate car position information is not supplied to the control device, accurate operation control will not be possible.

On the other hand, in an elevator, an electric motor is generally used as a drive device for driving a car, and this drive device is normally supplied with power to drive it. In addition, in order to ensure the safety of passengers, regular elevators are configured so that when the power supply is cut off, such as during a power outage, the car is either brought to an emergency stop or the car is operated using auxiliary power at the nearest floor. .

[Problems to be Solved by the Invention] In this case, even after the elevator enters the emergency stop operation, the car coasts due to inertia force. On the other hand, the car position detection device performs the car position detection operation by receiving the common power supply supplied to the drive device.
The car position detection function is stopped at the same time as the power supply is cut off. As a result, after the start of the emergency stop operation or during operation to the nearest floor during a power outage, the car position detection device stops functioning, making it impossible to input car position information to the control device. .

For this reason, in conventional elevators, it is necessary to operate the car to the bottom or top floor and reset the car position information in the control device before power is restored, especially before normal operation is resumed. It had become. For this reason, it takes a considerable amount of time to resume operation after the power is restored, resulting in a considerable delay in service time for hall calls. In particular, in an elevator system in which a large number of elevators are controlled using a computer, such as recent group control elevator systems, position information must be reset for all elevators. Since normal operation cannot be carried out, the power supply has to be cut off for a long time, which is a major problem, especially in high-rise buildings in recent years.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a car position detection system that can accurately detect the stopped position of a car by maintaining the car position detection function of a car position detection device in an operating state even after the normal power supply is cut off. The goal is to provide equipment.

Furthermore, it is an object of the present invention to provide a special auxiliary power supply device by using a capacitor provided in a drive circuit as an auxiliary power supply for a car position detection device for absorbing regenerative energy during regeneration mode operation of a drive device such as an induction motor. It is an object of the present invention to provide a device that can maintain a car position detection function even after power supply is stopped.

[Means for Solving the Problems] In order to achieve the above and other objects, according to the first configuration of the present invention, a drive device driven by supply of drive power is used to connect a plurality of floors. An elevator that continuously detects the position of an operated car, supplies a car position detection signal to a control device, and operates the car to a scheduled service floor determined according to the car position detection signal, car call, and hall call. In the device, a car position detection device that detects the car position and generates the car position detection signal is connected to the drive power source, and is also connected to a capacitor for absorbing regenerative energy when the drive device is operated in a regeneration mode, and the car position detection device detects the car position and generates the car position detection signal. and a power supply switching means is disposed between the capacitor and the car position detection device, the connection of the power supply switching means is switched from the drive power supply to the capacitor when the drive power supply is cut off, and the discharge power of the capacitor is used to switch the connection of the power supply switching means from the drive power supply to the capacitor. An elevator car position detecting device is provided, which is characterized in that the car position detecting device is driven.

Further, according to the second configuration of the present invention, the position of a car operated between a plurality of floors is continuously detected by a drive device driven by supply of drive power, and a car position detection signal is sent to a control device. an elevator configured to operate the car to a scheduled service floor determined according to the car position detection signal, the car call, and the hall call, and to emergency stop the operation of the car when the power supply of the drive power source is cut off. - In the device, a car position detection device that detects the car position and generates the car position detection signal is connected to the drive power source, and connected to a capacitor for absorbing regenerative energy when the drive device is operated in a regeneration mode, and the capacitor is connected to the drive power source. The discharging time of the car is set to be longer than the coasting time during an emergency stop of the car, and a power supply switching means is disposed between the drive power source, the capacitor, and the car position detection device, and the power supply switching means is connected. There is provided an elevator car position detection device, characterized in that the drive power source is switched to the capacitor when the drive power source is cut off, and the car position detection device is driven by the discharge power source of the capacitor. .

In the first and second configurations of the present invention described above, it is preferable that the drive device is constituted by a drive circuit including a motor and an inverter circuit, and the capacitor is disposed in the inverter circuit.

Further, in the second configuration, the discharge time constant of the capacitor should be set so as to maintain the car position detection device in an operating state for a predetermined period of time that exceeds the coasting time during an emergency stop of the car. It is.

[Function] In the first configuration described above, the elevator car is
It operates between multiple floors. A drive device that drives the car up and down is composed of an induction motor or the like, and is driven by a drive power supply such as a commercial power supply.

The operating position of the car is usually detected by a car position detection device composed of an encoder, etc., and the car position detection signal is
It is mainly supplied to a control device that controls the operation of the car by controlling the power supply to the drive device. The control device controls the drive device to move the car to a scheduled service floor determined in response to the car position detection signal, the car call, and the hall call.

In the present invention, the above-mentioned car position detection device is connected to the drive power source, and also connected to a regenerative energy absorption capacitor when the drive device is operated in a regenerative mode.
A power supply switching means is disposed between the drive power supply, the capacitor, and the car position detecting device, and the connection of the power supply switching means is switched from the drive power supply to the capacitor when the drive power supply is cut off, thereby controlling the discharge output of the capacitor. maintain the operating state of the car position detection device for a predetermined time by
The stopping position of the car is detected accurately.

In addition, in the second configuration of the present invention, by setting the discharging time of the capacitor according to the coasting time of the car at the time of emergency stop of the car when the power supply of the drive power source is cut off, the position when the car is stopped is adjusted. can be detected accurately.

[Embodiment] An elevator car position detecting device according to a preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 schematically shows an elevator circuit including an elevator car position detection system according to a preferred embodiment of the present invention. In this embodiment, a drive device that drives an elevator car (not shown) up and down via a suspension cable is composed of an AC induction motor 10. This electric motor 10 is connected to a drive circuit 16 including an inverter circuit 12 and a rectifier 14 connected to a three-phase AC power source.

The drive circuit 16 is supplied with a torque command signal and a speed command signal from a control circuit 18 in a well-known manner. The drive circuit 16 controls the value of alternating current supplied to the electric motor in accordance with these signals to obtain a desired acceleration/deceleration of the car. This drive circuit 16 further includes a capacitor 20 interposed in parallel with the inverter circuit 12 for absorbing regenerative energy generated when the electric motor 10 is operated in a regenerative mode. Note that both terminals of the capacitor 20 are connected to power supply lines 22a and 22b at connection points 24a and 24b, respectively. A DC-DC converter 26 is further connected to the connection points 24a and 24b. DC-D
The C converter connects power supply lines 22a and 22 from the rectifier 14.
A direct current of a predetermined voltage is generated from the direct current supplied from b.

This constant voltage DC current is supplied to the car position detection device 30 as an operating current.

On the other hand, the electric motor 10 is attached with a pulse signal generator 28 that generates a pulse signal TG having a frequency synchronized with the rotation of the electric motor. The pulse signal generator 28 is connected to a car position detection device 30 according to a preferred embodiment of the present invention;
The pulse signal TG is supplied to the car position detection device 30. Further, the car position detection device 30 is connected to a well-known floor detection device 34 that detects when the car approaches each floor and generates a floor detection signal PL. moreover,
A changeover switch 32 composed of a relay switch or the like is connected to the car position detection device j30, and two changeover terminals 32a and 32b of this switch 32 are connected to the secondary winding of the converter 38a and the power supply line 22b, respectively. and the connection point 24b of the capacitor 20.

In the configuration of this embodiment, the switch 32 functions as a means for detecting the power supply state, and when the power supply is normally performed, the secondary winding of the converter 38a is connected to the car position detection device 30. When the power supply is cut off, the connection point 24b is connected to the car position detection device 30. The car position detection device 30 detects the power supply state based on a change in the input level from the switch 32, and performs a position detection operation accordingly.

When the car position detection device 30 is normally powered, the car position detection device 30 detects the car position based on the floor detection signal PL supplied from the floor detection device 34 and the pulse signal TG supplied from the pulse signal generator 28. The position is detected and a car position detection signal CP is supplied to the control circuit 18. On the other hand, the car position detection device 30 detects a change in the input level from the switch 32 when the power supply is cut off, and starts operation in the emergency stop mode.

At this time, the output of the rectifier 14 becomes zero level as the power supply is cut off, but as a result, the capacitor 20 starts discharging, so the supply of operating current to the car position detection device of the DC-DC converter is stopped by the discharge output of the capacitor. It is maintained for a predetermined period of time. During this time, the car position detection device 30 continues counting the pulse signals supplied from the pulse signal generator 28 to generate car position data. This car position data is built into the car position detecting device 30 and sequentially written to an internally connected storage device 36. Note that the storage device 36 is a non-volatile storage device in order to retain the car position data even after the capacitor 20 has finished discharging.

Next, the operation of the car position detection device 30 according to the preferred embodiment of the present invention will be explained using FIG.

FIG. 2(a) shows the waveform of a commercial three-phase AC power supply supplied to the rectifier 14 of the drive circuit 16 as a drive power source, and in the illustrated example, a power outage occurs at time T.

As shown in FIG. 2(c), when a power outage occurs, the elevator starts operating in an emergency stop mode. After the operation of the emergency stop mode is started at time T1, the car coasts due to inertia, and at time T, the car speed becomes zero and stops. During this time, the capacitor 20 continues discharging as shown in FIG. 2(b) until the capacitance becomes substantially zero at time T3. Therefore, from time TI to time T3
The operating current continues to be supplied to the car position detection device 30 via the DC-DC converter 26 during the discharge time of the capacitor 20 up to.

On the other hand, the car position detection device 30 interrupts the power supply due to a change in the input level from the switch 32 at time T.
power outage) and switches its operating mode from normal mode to emergency stop mode.

As a result, the coasting distance of the car from time T to time T is detected by counting the pulse signal TG, and the car position at time T is stored in the storage device 36 as car position data DP.

Note that the discharge time of the capacitor 20 is maximized when the car coasts. For example, it is set in consideration of the coasting time during down-operation in a fully loaded state of the car.

When the power supply is restored, the control device 18
The car position data DP stored in the car position data is read out, and control is resumed with the position indicated by this car position data as the current car position. Therefore, it is not necessary to reset the car position when the power is restored, and the elevator can quickly resume operation after the power is restored.

[Brief explanation of drawings]

FIG. 1 is a block diagram schematically showing an elevator circuit including a car position detecting device according to a preferred embodiment of the present invention, and FIG. 2 is a timing chart showing the operation of the car position detecting device shown in FIG. be.

Claims (4)

[Claims] (1) Continuously detect the position of a car that is operated between multiple floors by a drive device driven by the supply of drive power, and supply a car position detection signal to a control device. In an elevator device that operates a car to a scheduled service floor determined in response to a call and a hall call, a car position detection device that detects the car position and generates the car position detection signal is connected to the drive power source; A power supply switching means is connected to a capacitor for absorbing regenerative energy during regeneration mode operation of the drive device, and a power supply switching means is disposed between the drive power supply and the capacitor and the car position detection device, and the power supply switching means is connected to the drive power supply. A car position detection device for an elevator, characterized in that when the drive power source is cut off, the drive power source is switched to the capacitor, and the car position detection device is driven by the discharge power source of the capacitor. (2) Continuously detects the position of a car operated between multiple floors by a drive device driven by the supply of drive power, supplies a car position detection signal to the control device, and uses the car position detection signal and the car In an elevator system configured to operate a car to a scheduled service floor determined according to a call and a hall call, and to emergency stop the operation of the car when the power supply of the drive power source is interrupted, the car position is detected and the car is A car position detection device that generates a car position detection signal is connected to the drive power source, and is also connected to a capacitor for absorbing regenerative energy when the drive device is operated in a regeneration mode, and the discharge time of the capacitor is set during an emergency stop of the car. The coasting time is set to be longer than the coasting time, and a power supply switching means is disposed between the drive power supply, the capacitor, and the car position detection device, and the power supply switching means is connected to the drive power supply when the drive power supply is cut off. A car position detection device for an elevator, characterized in that the car position detection device is driven by the discharge power of the capacitor by switching to the capacitor. (3) The drive device is composed of a drive circuit including an electric motor and an inverter circuit, and the capacitor is
3. The car position detection device according to claim 1, wherein the car position detection device is disposed in the inverter circuit. (4) The discharge time constant of the capacitor is set to maintain the car position detection device in an operating state for a predetermined period of time that exceeds the coasting time of the car during an emergency stop. car position detection device.