EP0471348A1 - Elevator car position detecting device - Google Patents
Elevator car position detecting device Download PDFInfo
- Publication number
- EP0471348A1 EP0471348A1 EP91113594A EP91113594A EP0471348A1 EP 0471348 A1 EP0471348 A1 EP 0471348A1 EP 91113594 A EP91113594 A EP 91113594A EP 91113594 A EP91113594 A EP 91113594A EP 0471348 A1 EP0471348 A1 EP 0471348A1
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- EP
- European Patent Office
- Prior art keywords
- car
- source
- car position
- detecting device
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/34—Details, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system
- B66B1/3492—Position or motion detectors or driving means for the detector
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
Definitions
- This invention relates to an elevator position-detecting device. More particularly, this invention relates to an elevator car position-detecting device which can detect the position of a car accurately when power failure has cut off the supply of electric power to the driving device of the elevator to stop the car in an emergency situation, so that elevator operation can be smoothly started again after the supply of power has been restored.
- the car position of an elevator may be constantly monitored by a car position-detecting device.
- An elevator-controlling device controls the acceleration speed, deceleration speed, and running direction of the car, based on a call for the car that assigns the preceding floor being input through the control panel in the car, hall call being input through the control panel at each floor, and said car position detection signal.
- the controlling device cannot easily make a highly accurate control of the run.
- the elevator generally a motor is used as the driving device to drive the car, and normally power is supplied to drive this driving device.
- the ordinary elevator is configured for operation so that the car can make an emergency stop or can be run by auxiliary power from a nearby floor when the power supply has been cut off, such as by power failure, to ensure the safety of the passengers.
- the car position-detecting device detects the car position after receiving the power supply from a common source which supplies power to the driving device, cutting off the power supply will stop the car position-detecting function.
- the car position-detecting device will remain inoperable after initiation of the emergency stop motion or during the run to the nearest floor during power failure, a situation is created whereby information about the position of the car relative to the controlling device cannot be obtained.
- an object of this invention is to provide a car position-detecting device which can accurately detect the stopping position of the car by keeping the car position-detecting function of the car position-detecting device in operating status even after normal cut-off of the power supply.
- Another object of this invention is to provide a device which can maintain the car position-detecting function after stopping the power supply, without providing a special auxiliary power device, by using the capacitor provided in the drive circuit for absorption of the recovery energy during the operation of the driving device, such as an induction motor and so on, in recovery mode, as the supplementary power source of the car position-detecting device.
- a car position-detecting device for an elevator is provided with the elevator capable of being operated between several floors by a drive motor powered by a source of drive power also used by the position detecting device for detecting the position of the car under normal conditions.
- the position detecting device provides a car position signal to an elevator controller which operates the car between various landings selected in response to car calls and hall calls with the controller controlling the positioning of the car with respect to the landings with reference to the car position signal, as characterized by connecting the car position-detecting device to the source of drive power and also, for use as a power source during a power interruption or recovery mode operation, connecting it to a recovery energy-storage device such as a capacitor connected to the source of power or a power source derived therefrom, thereby powering the car position-detecting device by means of a discharge of the capacitor if the normal source is interrupted.
- a recovery energy-storage device such as a capacitor connected to the source of power or a power source derived therefrom
- a car position-detecting device of an elevator apparatus detects the position of the car being operated between several floors continuously by the driving device driven by a source of drive power, feeds the car position detection signal to the control device, operates the car to a destined service floor determined in response to the car position detection signal, car call and hall call, and performs an emergency stop to the operation of the car when the source of power to the source of drive power has been cut off, as characterized by connecting the car position-detecting device that detects the position of the car and generates the car position detection signal to the source of drive power and also connecting it to the recovery energy-absorbing capacitor of the driving device during the recovery mode operation, setting the discharge time of the capacitor longer than the inertial running time at the time of the emergency stop of the car, disposing power switching between the capacitor and the car position-detecting device and the source of drive power, switching the connection of the source of power switching to the capacitor from the source of drive power when the source of drive power has been cut off, and driving the car position-detecting device by means of
- the driving device may be made from a driving circuit comprising a motor and an inverter circuit.
- the capacitor is preferably set in the inverter circuit.
- the discharge time constant of the capacitor should be set for a longer time than the inertial running time during the emergency stop of the car.
- the car of the elevator is run between several floors.
- the driving device which drives the car to ascend or descend is made of a motor such as an induction motor and is driven by an electrical drive power source, such as a commercial power supply.
- the running position of the car is detected by the car position-detecting device which is normally made of an encoder or the like, and the car position detection signal mainly controls the power supply to the driving device to feed the controlling device and controls the operation of the car.
- the control device controls the driving device in such a way as to operate the car to reach a selected service floor determined in response to the car position detection signal, car call, and hall call.
- the car position-detecting device is connected to the source of drive power and also to the recovery energy-absorbing capacitor of the driving device in recovery mode operation.
- a power switching means may be provided between the source of drive power and the capacitor and the car position-detecting device to switch the connection of the source of power switching from the source of drive power to the capacitor when the source of drive power has been cut off, for maintaining the operating status of the car position-detecting device for a certain length of time by the discharge output of the capacitor, so as to detect the stop position of the car accurately.
- the car stop position can be detected accurately by selecting the discharge time of the capacitor in proportion to the inertial running time of the car at emergency stop when the power supply to the source of drive power has been cut off.
- Fig. 1 illustrates an elevator system that contains an elevator car position-detecting device according to this invention.
- the driving device which drives and raises and lowers the car (not illustrated) via a suspension cable is driven by an AC induction motor (10).
- This motor (10) is connected to a drive circuit (16) which includes a rectifier (14) connected to an inverter circuit (12) and a three-phase AC power source (17a, 17b, 17c).
- Torque command signals and speed commands from a control circuit 18 to drive circuit (16) by any commonly known means.
- the drive circuit (16) controls the AC current level to be fed to the motor, based on these signals, to achieve a desired acceleration or deceleration speed for the car.
- a capacitor (20) to absorb energy to be used when the motor (10) is operated in recovery mode is mounted in this drive circuit (16) parallel to the inverter circuit (12).
- both terminals of the capacitor (20) are connected, respectively, to the feeding wires (22a) and (22b) through the connecting points (24a) and (24b).
- a DC-DC converter (26) is further connected to these connecting points (24a) and (24b).
- the DC-DC converter generates a DC current of a specific voltage level from the DC current which is fed from the rectifier (14) through the feeding wires (22a) and (22b). This DC current of a specific voltage level is fed as an operating current to a car position-detecting device (30).
- a pulse signal generator (28) to generate a pulse signal TG at a frequency synchronized to the rotation of the motor is mounted on the motor (10).
- the generator (28) is a speed sensor.
- the pulse signal generator (28) is connected to the car position-detecting device (30) of this example of the invention and feeds the pulse signal (TG) to the car position-detecting device (30).
- a known floor detecting device (34) detects its position as the car approaches each floor and generates a floor detection signal (FL) connected to the car position-detecting device (30).
- a switch (32) made of a relay switch is connected to the car position-detecting device (30), and two switching terminals (32a) and (32b) of this switch (32) are connected, respectively, to the secondary coil of the converter (38a), feeding wire (22b), and the connecting point (24b) of the capacitor (20).
- the switch (32) responds to a detecting means (not shown) which functions to detect the power supply status.
- a detecting means not shown
- the switch When the power supply is in a state of normal operation, it causes the switch to connect the secondary coil of the converter (38a) to the car position-detecting device (30).
- the connecting point (24b) When the power supply has been cut off, it connects the connecting point (24b) to the car position-detecting device (30).
- the car position-detecting device (30) detects the status of the power supply by the change of the input level caused by the switching of the switch (32) to perform a position-detecting operation.
- the car position-detecting device (30) detects the position of the car and feeds the car position detection signal CP to the control circuit (18), based on the pulse signal TG being supplied from the pulse signal generator (28) and the floor detection signal FL, which has been supplied from the floor-detecting device (34).
- the car position-detecting device (30) detects the change of input level from the switch (32) when the power supply has been cut off and starts the operation of the emergency stop mode. In this case, the output from the rectifier (14) is at zero level as the power supply was cut off.
- the capacitor (20) Since the capacitor (20) starts its electrical discharge as a result, the discharge output from the capacitor will maintain the level of operating current for a specific length of time, based on the DC-DC converter relative to the car position-detecting device. During this period, the car position-detecting device (30) continues to count the pulse signals supplied from the pulse signal generator (28) and generates the car position data. This car position data is stored in the car position-detecting device (30) and is written sequentially in a memory device (36) which is internally connected. Incidentally, the memory device (36) is composed of a nonvolatile memory device to hold the car position data even after completion of the discharge from the capacitor (20).
- Fig. 2(a) illustrates a waveform 40 of a commercial three-phase AC power source which is fed on the lines (17a, 17b, 17c) to the rectifier (14) of the drive circuit (16) to serve as the source of drive power.
- power stoppage has occurred at time ti.
- Figure 2(c) which shows in a plot of speed or travel distance, as power failure occurred, the elevator starts its operation in emergency stop mode. After the emergency stop mode operation started at time t i , the car proceeds by inertial force, the speed reaches zero, and the car is stopped at time t 2 . During this period, the capacitor (20) continued to discharge, as illustrated by a waveform 44 in Fig.
- the car position-detecting device (30) detects the power supply cut-off (power failure) by the change of the input level from the switch (32) at time ti and switches the operating mode from a normal mode to an emergency stop mode.
- the inertial running distance of the car from time t i to time t 2 is detected by the count of the pulse signal TG, and the car position at time t 2 will be stored as the car position data DP in the memory device (36).
- the length of discharge time of the capacitor (20) may be selected to ensure sufficient energy is stored to sustain the memory storage function, considering the longest, i.e., worst case inertial running distance or time of the car, e.g., full load.
- control circuit (18) reads out the car position data DP stored in the memory device (36) and the control is restarted with the position shown in this car position data as the current car position. Therefore, it is no longer necessary to reset the car position after restoring the power supply, and thus the restart of elevator operation after restoration of the power supply can be done quickly.
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Computer Networks & Wireless Communication (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
- Indicating And Signalling Devices For Elevators (AREA)
- Elevator Control (AREA)
Abstract
A position sensing device is maintained during a power interruption by powering the position sensing circuitry by means of an energy storage device during a slowdown to a stop position. The information is stored in a nonvolatile memory.
Description
- This invention relates to an elevator position-detecting device. More particularly, this invention relates to an elevator car position-detecting device which can detect the position of a car accurately when power failure has cut off the supply of electric power to the driving device of the elevator to stop the car in an emergency situation, so that elevator operation can be smoothly started again after the supply of power has been restored.
- As is well known, the car position of an elevator may be constantly monitored by a car position-detecting device. An elevator-controlling device controls the acceleration speed, deceleration speed, and running direction of the car, based on a call for the car that assigns the preceding floor being input through the control panel in the car, hall call being input through the control panel at each floor, and said car position detection signal. Thus, if accurate information of the car position is not available, the controlling device cannot easily make a highly accurate control of the run.
- On the other hand, in the elevator, generally a motor is used as the driving device to drive the car, and normally power is supplied to drive this driving device. The ordinary elevator is configured for operation so that the car can make an emergency stop or can be run by auxiliary power from a nearby floor when the power supply has been cut off, such as by power failure, to ensure the safety of the passengers.
- On such occasions, even after the elevator made an emergency stop, the car would make an inertial run due to the inertial force. On the other hand, since the car position-detecting device detects the car position after receiving the power supply from a common source which supplies power to the driving device, cutting off the power supply will stop the car position-detecting function. As a result, since the car position-detecting device will remain inoperable after initiation of the emergency stop motion or during the run to the nearest floor during power failure, a situation is created whereby information about the position of the car relative to the controlling device cannot be obtained.
- Because of this situation, in a conventional elevator, the car has to be operated to the lowest floor or the highest floor to reset the information concerning the car position in the controlling device prior to restarting the normal run after restoration of the power source. For this reason, substantial time is required to restart normal operation after restoration of the power supply; this has resulted in a substantial delay of the service time to respond to the hall call. Particularly, like the group-controlled elevator system of recent years where many elevators are controlled by a microprocessor, normal operation is not possible unless the information concerning the position of all elevators has been reset. Therefore, the recovery time after restoration of the power supply tends to become longer. This extension of the recovery time has become a serious problem, particularly in high-rise buildings built in recent years.
- Therefore, an object of this invention is to provide a car position-detecting device which can accurately detect the stopping position of the car by keeping the car position-detecting function of the car position-detecting device in operating status even after normal cut-off of the power supply.
- Another object of this invention is to provide a device which can maintain the car position-detecting function after stopping the power supply, without providing a special auxiliary power device, by using the capacitor provided in the drive circuit for absorption of the recovery energy during the operation of the driving device, such as an induction motor and so on, in recovery mode, as the supplementary power source of the car position-detecting device.
- According to the first aspect of the present invention, to attain the objective described above and other objectives, a car position-detecting device for an elevator is provided with the elevator capable of being operated between several floors by a drive motor powered by a source of drive power also used by the position detecting device for detecting the position of the car under normal conditions. The position detecting device provides a car position signal to an elevator controller which operates the car between various landings selected in response to car calls and hall calls with the controller controlling the positioning of the car with respect to the landings with reference to the car position signal, as characterized by connecting the car position-detecting device to the source of drive power and also, for use as a power source during a power interruption or recovery mode operation, connecting it to a recovery energy-storage device such as a capacitor connected to the source of power or a power source derived therefrom, thereby powering the car position-detecting device by means of a discharge of the capacitor if the normal source is interrupted.
- According to a second aspect of the present invention, a car position-detecting device of an elevator apparatus detects the position of the car being operated between several floors continuously by the driving device driven by a source of drive power, feeds the car position detection signal to the control device, operates the car to a destined service floor determined in response to the car position detection signal, car call and hall call, and performs an emergency stop to the operation of the car when the source of power to the source of drive power has been cut off, as characterized by connecting the car position-detecting device that detects the position of the car and generates the car position detection signal to the source of drive power and also connecting it to the recovery energy-absorbing capacitor of the driving device during the recovery mode operation, setting the discharge time of the capacitor longer than the inertial running time at the time of the emergency stop of the car, disposing power switching between the capacitor and the car position-detecting device and the source of drive power, switching the connection of the source of power switching to the capacitor from the source of drive power when the source of drive power has been cut off, and driving the car position-detecting device by means of the source of discharge power of the capacitor.
- In the above-mentioned first and second aspects of this invention, the driving device may be made from a driving circuit comprising a motor and an inverter circuit. The capacitor is preferably set in the inverter circuit.
- Also, in the above-mentioned second aspect, the discharge time constant of the capacitor should be set for a longer time than the inertial running time during the emergency stop of the car.
- In the above-mentioned first aspect, the car of the elevator is run between several floors. The driving device which drives the car to ascend or descend is made of a motor such as an induction motor and is driven by an electrical drive power source, such as a commercial power supply. The running position of the car is detected by the car position-detecting device which is normally made of an encoder or the like, and the car position detection signal mainly controls the power supply to the driving device to feed the controlling device and controls the operation of the car. The control device controls the driving device in such a way as to operate the car to reach a selected service floor determined in response to the car position detection signal, car call, and hall call. In this invention, the car position-detecting device is connected to the source of drive power and also to the recovery energy-absorbing capacitor of the driving device in recovery mode operation. A power switching means may be provided between the source of drive power and the capacitor and the car position-detecting device to switch the connection of the source of power switching from the source of drive power to the capacitor when the source of drive power has been cut off, for maintaining the operating status of the car position-detecting device for a certain length of time by the discharge output of the capacitor, so as to detect the stop position of the car accurately.
- Also, in the second aspect of this invention, the car stop position can be detected accurately by selecting the discharge time of the capacitor in proportion to the inertial running time of the car at emergency stop when the power supply to the source of drive power has been cut off.
- These and other objects, features and advantages of the present invention will become more apparent in light of the following detailed description of a best mode embodiment thereof, as illustrated in the accompanying drawing.
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- Fig. 1 is a block diagram to illustrate briefly the elevator circuit which includes the car position-detecting device, in accordance with an embodiment of this invention; and
- Fig. 2 is a timing chart to illustrate the operation of the car position-detecting device shown in Fig. 1.
- Fig. 1 illustrates an elevator system that contains an elevator car position-detecting device according to this invention. In this application example, the driving device which drives and raises and lowers the car (not illustrated) via a suspension cable is driven by an AC induction motor (10). This motor (10) is connected to a drive circuit (16) which includes a rectifier (14) connected to an inverter circuit (12) and a three-phase AC power source (17a, 17b, 17c). Torque command signals and speed commands from a control circuit 18 to drive circuit (16) by any commonly known means. The drive circuit (16) controls the AC current level to be fed to the motor, based on these signals, to achieve a desired acceleration or deceleration speed for the car. A capacitor (20) to absorb energy to be used when the motor (10) is operated in recovery mode is mounted in this drive circuit (16) parallel to the inverter circuit (12). Incidentally, both terminals of the capacitor (20) are connected, respectively, to the feeding wires (22a) and (22b) through the connecting points (24a) and (24b). A DC-DC converter (26) is further connected to these connecting points (24a) and (24b). The DC-DC converter generates a DC current of a specific voltage level from the DC current which is fed from the rectifier (14) through the feeding wires (22a) and (22b). This DC current of a specific voltage level is fed as an operating current to a car position-detecting device (30).
- On the other hand, a pulse signal generator (28) to generate a pulse signal TG at a frequency synchronized to the rotation of the motor is mounted on the motor (10). In other words, the generator (28) is a speed sensor.
- The pulse signal generator (28) is connected to the car position-detecting device (30) of this example of the invention and feeds the pulse signal (TG) to the car position-detecting device (30). And, a known floor detecting device (34) detects its position as the car approaches each floor and generates a floor detection signal (FL) connected to the car position-detecting device (30). Furthermore, a switch (32) made of a relay switch is connected to the car position-detecting device (30), and two switching terminals (32a) and (32b) of this switch (32) are connected, respectively, to the secondary coil of the converter (38a), feeding wire (22b), and the connecting point (24b) of the capacitor (20).
- In the configuration of this embodiment, the switch (32) responds to a detecting means (not shown) which functions to detect the power supply status. When the power supply is in a state of normal operation, it causes the switch to connect the secondary coil of the converter (38a) to the car position-detecting device (30). When the power supply has been cut off, it connects the connecting point (24b) to the car position-detecting device (30). The car position-detecting device (30) detects the status of the power supply by the change of the input level caused by the switching of the switch (32) to perform a position-detecting operation.
- Under normal status of power supply, the car position-detecting device (30) detects the position of the car and feeds the car position detection signal CP to the control circuit (18), based on the pulse signal TG being supplied from the pulse signal generator (28) and the floor detection signal FL, which has been supplied from the floor-detecting device (34). On the other hand, the car position-detecting device (30) detects the change of input level from the switch (32) when the power supply has been cut off and starts the operation of the emergency stop mode. In this case, the output from the rectifier (14) is at zero level as the power supply was cut off. Since the capacitor (20) starts its electrical discharge as a result, the discharge output from the capacitor will maintain the level of operating current for a specific length of time, based on the DC-DC converter relative to the car position-detecting device. During this period, the car position-detecting device (30) continues to count the pulse signals supplied from the pulse signal generator (28) and generates the car position data. This car position data is stored in the car position-detecting device (30) and is written sequentially in a memory device (36) which is internally connected. Incidentally, the memory device (36) is composed of a nonvolatile memory device to hold the car position data even after completion of the discharge from the capacitor (20).
- Next, let us use Fig. 2 to explain the operation of the car position-detecting device (30) by this embodiment of the invention.
- Fig. 2(a) illustrates a waveform 40 of a commercial three-phase AC power source which is fed on the lines (17a, 17b, 17c) to the rectifier (14) of the drive circuit (16) to serve as the source of drive power. In the illustrated example, power stoppage has occurred at time ti. As illustrated in Figure 2(c) which shows in a plot of speed or travel distance, as power failure occurred, the elevator starts its operation in emergency stop mode. After the emergency stop mode operation started at time ti, the car proceeds by inertial force, the speed reaches zero, and the car is stopped at time t2. During this period, the capacitor (20) continued to discharge, as illustrated by a waveform 44 in Fig. 2(b), until the capacitance output reached a substantially zero level at time t3. Therefore, during the discharge time of the capacitor (20) from time ti to time 13, operating current was supplied to the car position-detecting device (30) continuously via the DC-DC converter (26).
- On the other hand, the car position-detecting device (30) detects the power supply cut-off (power failure) by the change of the input level from the switch (32) at time ti and switches the operating mode from a normal mode to an emergency stop mode. As a result, the inertial running distance of the car from time ti to time t2 is detected by the count of the pulse signal TG, and the car position at time t2 will be stored as the car position data DP in the memory device (36).
- Incidentally, the length of discharge time of the capacitor (20) may be selected to ensure sufficient energy is stored to sustain the memory storage function, considering the longest, i.e., worst case inertial running distance or time of the car, e.g., full load. When the electric supply is restored, control circuit (18) reads out the car position data DP stored in the memory device (36) and the control is restarted with the position shown in this car position data as the current car position. Therefore, it is no longer necessary to reset the car position after restoring the power supply, and thus the restart of elevator operation after restoration of the power supply can be done quickly.
- Although the invention has been shown and described with respect to a best mode embodiment thereof, it should be understood by those skilled in the art that the foregoing and various other changes, omissions, and additions in the form and detail thereof may be made therein without departing from the spirit and scope of the invention.
Claims (5)
1. A car position-detecting device of an elevator apparatus, which detects the position of the car being operated between several floors continuously by the driving device which is driven by a source to supply drive power, feeds the car position detection signal to the control device, and operates the car to a destined service floor which is determined in response to the car position detection signal, car call, and hall call, as characterized by connecting the car position-detecting device that detects the position of the car and generates the car position detection signal to the source of drive power and also connecting it to the recovery energy-absorbing capacitor of the driving device during the recovery mode operation; disposing a source of power switching between the capacitor and the car position-detecting device and the source of drive power, switching the connection of the power switching means to the capacitor from the source of drive power when the source of drive power has been cut off, and driving the car position-detecting device by means of the source of discharge power of the capacitor.
2. A car position-detecting device of an elevator apparatus, which detects the position of the car being operated between several floors continuously by the driving device which is driven by a source of drive power, feeds the car position detection signal to the control device, operates the car to a destined service floor which is determined in response to the car position detection signal, car call and hall call, and performs an emergency stop to the operation of the car when the power source supply to the source of drive power has been cut off, as characterized by connecting the car position-detecting device that detects the position of the car and generates the car position detection signal to the source of drive power and connecting it also to the recovery energy-absorbing capacitor of the driving device during the recovery mode operation, setting the discharge time of the capacitor longer than the inertial running time at the time of the emergency stop of the car, disposing a source of power switching between the capacitor and the car position-detecting device and the source of drive power, switching the connection of the source of power switching to the capacitor from the source of drive power when the source of drive power has been cut off, and driving the car position-detecting device by means of the source of discharge power of the capacitor.
3. The car position-detecting device according to claim 1, where the driving device is comprised of a drive circuit comprising a motor and an inverter circuit, and the capacitor is disposed in the inverter circuit.
4. The car position-detecting device according to claim 2, where the discharge time constant of the capacitor is set longer than the inertial running time at the emergency stop of the car so as to keep the car position-detecting device in operating status.
5. The car position-detecting device according to claim 2, where the driving device is comprised of a drive circuit comprising a motor and an inverter circuit, and the capacitor is disposed in the inverter circuit.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP214703/90 | 1990-08-14 | ||
JP2214703A JPH04101978A (en) | 1990-08-14 | 1990-08-14 | Cage position detecting device for elevator |
Publications (1)
Publication Number | Publication Date |
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EP0471348A1 true EP0471348A1 (en) | 1992-02-19 |
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ID=16660210
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP91113594A Withdrawn EP0471348A1 (en) | 1990-08-14 | 1991-08-13 | Elevator car position detecting device |
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EP (1) | EP0471348A1 (en) |
JP (1) | JPH04101978A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2010079258A1 (en) * | 2009-01-12 | 2010-07-15 | Kone Corporation | Transportation system |
ES2394334A1 (en) * | 2012-07-06 | 2013-01-30 | Coapsa Control, S.L. | Emergency device for safe descent of loads (Machine-translation by Google Translate, not legally binding) |
WO2023284291A1 (en) * | 2021-07-14 | 2023-01-19 | 日立楼宇技术(广州)有限公司 | Elevator power failure emergency device, method and apparatus, and elevator |
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GB2174217A (en) * | 1985-04-25 | 1986-10-29 | Otis Elevator Co | Backup position signalling in an elevator |
FR2586311A1 (en) * | 1985-08-17 | 1987-02-20 | Bosch Gmbh Robert | CIRCUIT DEVICE COMPRISING A MICROCALCULATOR AND A SEMICONDUCTOR MEMORY IN DATA EXCHANGE WITH THIS MICROCALCULATOR, PARTICULARLY FOR MOTOR VEHICLES |
US4754851A (en) * | 1985-04-15 | 1988-07-05 | Mitsubishi Denki Kabushiki Kaisha | Control apparatus for elevator |
WO1988009584A1 (en) * | 1987-05-20 | 1988-12-01 | Otis Elevator Company | Alternating current motor control system with emergency control |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5127523B2 (en) * | 1972-08-03 | 1976-08-13 |
-
1990
- 1990-08-14 JP JP2214703A patent/JPH04101978A/en active Pending
-
1991
- 1991-08-13 EP EP91113594A patent/EP0471348A1/en not_active Withdrawn
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4142609A (en) * | 1976-12-13 | 1979-03-06 | Mitsubishi Denki Kabushiki Kaisha | Elevator control system |
US4124103A (en) * | 1977-03-09 | 1978-11-07 | Westinghouse Electric Corp. | Elevator system |
GB2063522A (en) * | 1979-11-22 | 1981-06-03 | Hitachi Ltd | Apparatus for determining elevator car position |
GB2111251A (en) * | 1981-11-16 | 1983-06-29 | Mitsubishi Electric Corp | Apparatus for operating an ac powered lift |
US4754851A (en) * | 1985-04-15 | 1988-07-05 | Mitsubishi Denki Kabushiki Kaisha | Control apparatus for elevator |
GB2174217A (en) * | 1985-04-25 | 1986-10-29 | Otis Elevator Co | Backup position signalling in an elevator |
FR2586311A1 (en) * | 1985-08-17 | 1987-02-20 | Bosch Gmbh Robert | CIRCUIT DEVICE COMPRISING A MICROCALCULATOR AND A SEMICONDUCTOR MEMORY IN DATA EXCHANGE WITH THIS MICROCALCULATOR, PARTICULARLY FOR MOTOR VEHICLES |
WO1988009584A1 (en) * | 1987-05-20 | 1988-12-01 | Otis Elevator Company | Alternating current motor control system with emergency control |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010079258A1 (en) * | 2009-01-12 | 2010-07-15 | Kone Corporation | Transportation system |
EP2382149A1 (en) * | 2009-01-12 | 2011-11-02 | Kone Corporation | Transportation system |
CN102272032A (en) * | 2009-01-12 | 2011-12-07 | 通力股份公司 | Transportation system |
US8177033B2 (en) | 2009-01-12 | 2012-05-15 | Kone Corporation | Transportation system with capacitive energy storage and non-volatile memory for storing the operational state of the transportation system upon detection of the operational anomaly in power |
EP2382149A4 (en) * | 2009-01-12 | 2012-06-06 | Kone Corp | Transportation system |
CN102272032B (en) * | 2009-01-12 | 2014-10-22 | 通力股份公司 | Transportation system |
ES2394334A1 (en) * | 2012-07-06 | 2013-01-30 | Coapsa Control, S.L. | Emergency device for safe descent of loads (Machine-translation by Google Translate, not legally binding) |
WO2023284291A1 (en) * | 2021-07-14 | 2023-01-19 | 日立楼宇技术(广州)有限公司 | Elevator power failure emergency device, method and apparatus, and elevator |
Also Published As
Publication number | Publication date |
---|---|
JPH04101978A (en) | 1992-04-03 |
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